• 한국작물학회지
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• 제3권
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• pp.89-98
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• 1965

대두증산의 중요성에 미추어 대두의 다수계통 선발을 위하여 전년에 공시한 22품종을 재료로 각 형질의 유전력, 각 형질상호간의 유전상관, 그리고 선발지수 등을 재검토하기 위하여 선발시험을 한 바 대체로 전보 전년의 결과와 같다. 1. 유전력 : 유전력을 추정하기 위하여 파종기별로 각 형질의 평균치의 변동을 보면 제1표와 같이 파종기가 지연됨에 따라 형질의 평균치는 감소하고 (Table 1), 형질중에는 환경에 따라 크게 영향을 받는 것도 있으며(Table 2), 각 형질별 유전력을 추정한 바 그 결과는 제3표와 같다. 즉 개화일수ㆍ결실일수ㆍ생육일수 등 생유기간에 관계되는 형질은 그의 유전력이 높고 형태적 특성에 관계되는 형질중에서도 경장 100입중은 높으나 수량에 관여하는 형질 등은 낮았다. 그리고 파종기에 따라서도 변동을 하며 대체로 파종기가 늦어짐에 따라 감소하는 경향이 보인다(Table 3). 2. 유전상관 : 각 형질 상호간의 유전상관ㆍ표현형상관을 알기 위하여 각 형질의 표현형분산과 각 형질 상호간의 표현형공분산ㆍ유전공분산. 그리고 환경공분산을 산출한 바 그 결과는 제4,5표와 같고(Table 4,5), 그들의 유전상관과 표현형상관은 제6표와 같다(Table 6). 대체로 유전사관의 정도는 표현형상관보다높으나 파종기에 따라서도 변동하고 있다. 일주입중 즉 수랴오가 타형질과의 상관을 보면 대체로 전보와 같이 100입중이외의 제형질은 정의 상관을 보이며, 파종기에 따라서도 그 값이 변동을 하나 전보에서는 일주입중과 분지수 사이에 고도의 상관관계가 보였으나, 본실험에 있어서는 상관의 경향이 보였을 따름이다. 그리고 본실험에 있어서는 일주협수와 일주입수간에서 유전상관이 1이상의 이상치를 보였다. 3. 선발지수 : 선발이 최종 대상형질을 일주입중(형질 Y)으로 하여 여기에 어려 형질을 조합한 선발지수(Selection index A)와 최종 대상형질을 수량과 높은 유전상관이 있는 일주협수(형질 Y')로 하여 여기에 여러 형질을 조합한 선발지수(Selection index B)를 Robinson et al.의 방법에 의하여 작성하여 본 바 제7표와 같다(Table 7). 전보의 결과와 같이 대두의 선발에 있어서는 최종 대상형질을 일주입중 대신에 일주협수로써 선발하여도 대차가 없고, 선발대상형질을 4개형질이상인 경우에는 그 효과가 조사와 산출에 요하는 노력에 비하여 크게 기대될 정도가 못된다. 이와 같은 점에서 다수확을 목표로 하는 선발은 탈곡조제 전에 일주협수ㆍ분지수ㆍ경직경 등에 대하여 조사를 하고 선발지수를 산출하여 Selection score가 큰 계통부터 선발하여 가면 될 것으로 믿는다. 그리고 선발을 위한 대상형질로는 생육일수(X$_1$)ㆍ분지수(X$_2$)ㆍ경직경(X$_3$), 그리고 일주협수(X$_4$)의 4개형질 혹은 분지수(X$_2$)ㆍ경직경(X$_3$), 그리고 일주협수(X$_4$)의 3개형질로 할 것이 요망되고, 이들 형질의 측정치로 선발지수를 작성하여 그 지수에서 산출된 Selection score가 큰 계통부터 선발해 나가는 것이 선발지수의 이용상 실용적이고 효과적인 방법이라 하겠다.

• 한국농공학회지
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• 제15권1호
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• pp.2913-2924
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• 1973

이와같은 방법(方法)에 의(依)하여 얻은 몇가지 시험결과(試驗結果)를 요약(要約)하면 다음과 같다. 1. 어느 시험구(試驗區)를 막론(莫論)하고 건조진행(乾燥進行)은 표층토(表層土)가 라지구(裸地區)보다는 초지구(草地區)가 그 진행속도(進行速度)가 좀빠른 경향(傾向)을 나타냈다. 2. 건조과정(乾燥過程)에 강우(降雨)가 있으며 토양수분(土壤水分)은 강우침투경로(降雨浸透經路)를 통(通)하여 포장용수량(圃場容水量) 또는 수분당량(水分當量) 부근(附近)으로 회복(回復)하고 있다. 3. 성층토양(成層土壤)에서 하층토(下層土)의 토성(土性)이 상층토(上層土)의 건조(乾燥)에 미치는 영향(影響)은 다음과 같이 설명(說明)된다. 가. 하층토(下層土)가 S이고 토층토(土層土)가 CL 또는 SL인 경우에 이 CL 또는 SL의 건조(乾燥)는 포장용수량(圃場容水量)이 적은 하층(下層)의 S가 어느정도(程度) 모관수공급(毛管水供給)의 차단층(遮斷層)이 되어 하층토(下層土)가 SL 또는 CL로 되었을 때보다 훨씬 건조(乾燥)가 빨리 진행(進行)하며 CL보다는 SL쪽이 현저(顯著)하게 빨리 건조(乾燥)한다. 나. 하층토(下層土)가 SL이고 상층토(上層土)가 S 또는 SL인경우에 이 S 또는 CL의 건조(乾燥)는 포장용수량(圃場容水量)이 비교적(比較的) 크고 또 모관수전도도(毛管水傳導度)도 비교적(比較的) 원활(圓滑)한 하층(下層)의 SL로 인(因)하여 그 진행속도(進行速度)가 가장 완만하며 S보다는 CL쪽이 더빨리 건조(乾燥)하는 경향(傾向)이다. 다. 하층토(下層土)가 CL이고 상층토(上層土)가 S 또는 SL인 경우에 이 S 또는 SL의 건조(乾燥)는 포장용수량(圃場容水量)이 가장 크나 모관수전도도(毛管水傳導度)가 가장느린 하층(下層)의 CL로 인(因)하여 그 진행속도(進行速度)가 비교적(比較的) 빠른 편(便)이며 S보다는 SL쪽이 더 발리 건조(乾燥)하는 경향(傾向)이다. 4. 상층토양(上層土壤) 및 하층토양(下層土壤)에서의 함수비(含水比)에 대(對)한 1일간(日間)의 시간적(時間的) 변화(變化)를 보면 상층토양(上層土壤)이 CL 및 SL에 있어서는 기온(氣溫)이 상승(上昇)하는 $12{\sim}15$시(時) 사이 까지는 함수비(含水比)가 감소(減少)되고 18시(時) 이후(以後)부터는 약간(若干) 회복(回復)하는 경향(傾向)을 보이는데 이에 반(反)하여 S에 있어서는 기온(氣溫)이 상승(上昇)하는 $12{\sim}15$시(時)에 함수비(含水比)가 Peak점(點)을 이루는 경향(傾向)을 보였으며 하층토양(下層土壤)에서의 함수비(含水比)는 CL, SL 및 S모두 기온상승(氣溫上昇)에 따라서 약간감소(若干減少)하는 경향(傾向)을 나타냈고 구름낀날의 함수비(含水比)의 변화(變化)는 CL, SL 및 S공(共)히 맑은 날에 비(比)하여 약간(若干) 작은 경향(傾向)을 보였다. 5. 적산계기증발량(積算計蒸發量)에 대(對)한 적산토양수분소비율(積算土壤水分消費率)은 일반적(一般的)으로 화지구(華地區)가 라지구(裸地區)보다 큰 경향(傾向)을 보였으며 시일(時日)의 경과(經過)에 따라 그 율(率)이 감소(減少)하는 경향(傾向)을 보였고 또 그것은 초기(初期)에는 주(主)로 상층토양(上層土壤)의 토성(土性)에 좌우(左右)되고 후기(後期)에는 하층토양(下層土壤)의 토성(土性)에 많이 좌우(左右)되는 경향(傾向)이었다. 6. 적산토양수분소비율(積算土壤水分消費率)은 하층토(下層土)가 SL 또는 S이고 상층토(上層土)가 CL인 경우(境遇)에 하층(下層)이 SL인 경우(境遇)가 S인 경우보다 변화폭(變化幅)에 컸으며, 하층(下層)이 CL, 또는 S이고 상층(上層)이 SL인 경우(境遇)는 가장 큰 값을 나타냈는데 하층(下層)이 CL인 소우(塑遇)의 그 값은 S인 경우보다 약간(若干)큰 경향(傾向)을 보였다. 또한 하층(下層)이 CL 또는 SL이고 상층(上層)이 S인 경우는 위에 말한 두 경우보다도 작은 값을 보였으며 하층(下層)이 CL인 경우(境遇)가 SL인 경우보다 더욱더 작은 값을 나타내는 경향(傾向)을 보였으며, 즉(卽) 본시험(本試驗)에서의 토양수분(土壤水分) 소비율(消費率)은 대체(大體)로 SL/CC> SL/S>CL/SL> CL/S$\fallingdotseq$S/SL> S/CL>의 순위(順位)로 되었다.

• Journal of Chest Surgery
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• 제35권6호
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• pp.420-429
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• 2002

심장수술시 체외순환은 저체온 기법으로 실시되지만 최근의 동향은 정상체온 체외순환 기법을 사용하려는 경향이 늘고 있다. 그러나 심장수술 동안 뇌 대사에 대한 정상 체온 체외순환의 임상적 유용성이나 안전성은 아직 완전히 이해되거나 확립되지 않은 상태이다. 저자들은 심장수술 동안 뇌 대사에 대한 정상 체온 체외순환 기법과 중등도 저체온 체외순환 기법의 영향을 비교 평가하기 위해 전향적 연구를 시행하게 되었다. 대상 및 방법: 36명의 성인 심장수술 환자들은 연구목적에 따라 정상 체온 체외순환군(이하 정상체온군, 비인두 온도＞34.5$^{\circ}C$, n=18)과 중등도 저 체온 체외순환군(이하 저체온군, 비인두 온도 29~3$0^{\circ}C$, n=18)으로 한 뒤 비박동성 체외순환을 실시하였다. 전체 환자들에 대해 중대뇌 동맥 뇌혈류 속도(뇌혈류 속도), 뇌동정맥 산소 함량차, 뇌산소 추출률, 수정 뇌산소 대사율, 뇌산소 운반율, 뇌정맥 산소 불포화도(내경 정맥구 혈액 산소포화도$\leq$50%), 기타 동맥 및 내경 정맥구 혈액의 가스분석 등을 체외순환 전(기준치), 체외순환-10분, 재가온-1기(저체온군의 비인두 온도 34$^{\circ}C$때), 재가온-2기(양 그룹의 비인두 온도 37$^{\circ}C$때), 체외순환 종료 직후, 흉부 피부 봉합기 때 측정하였다. 수술 후 신경학적 합병증 역시 관찰하였으며, 전술한 모든 변수들을 양 그룹간에 비교 분석하였다. 결과： 뇌혈류 속도는 재가온­2 때 저체온군(153.11$\pm$8.98 %)이 정상체온군(131.18$\pm$6.94 %) 보다 유의하게 높았다(p＜0.05). 체외순환 10분 때의 뇌동정맥 산소함량차(3.47$\pm$0.21 vs 4.28$\pm$0.29 mL/dL, p＜0.05), 뇌산소 추출률(0.30$\pm$0.02 vs 0.39$\pm$0.02, p＜0.05), 그리고 뇌산소 대사율(4.71$\pm$0.42 vs 5.36$\pm$0.45, p＜0.05)은 저체온군이 정상체온군 보다 유의하게 낮았다. 뇌산소 운반율은 저체온군이 정상체온군 보다 체외순환 10분(1,527.60$\pm$25.84 vs 1,368.74$\pm$20.03, p＜0.05), 재가온-2기(1,757.50$\pm$32.30 vs 1,478.60$\pm$27.41, p<0.05), 흉부 피부봉합기 때(1,734.37$\pm$41.45 vs 1,597.68$\pm$27.50, p＜0.05) 유의하게 더 높았다. 체외순환 10분 때 내경 정맥구의 산소분압(40.96$\pm$1.16 vs 34.79$\pm$2.18 mmHg, p＜0.05), 산소포화도(72.63$\pm$2.68 vs 64.76$\pm$2.49 %, p＜0.05), 그리고 산소함량(8.08$\pm$0.34 vs 6.78$\pm$0.43 mL/dL, p＜0.05)은 저체온군이 정상체온군 보다 유의하게 더 높았다. 수술 후 신경학적 합병증(섬망) 발생 환자 수는 저체온군이 정상체온군 보다 유의하게 적었고(2 명 vs 4 명, p＜0.05) 섬망증세의 지속시간 역시 저체온군이 정상체온군 보다 훨씬 짧았다(60 시간 vs 160 시간, p＜0.01). 결론: 이상의 연구 결과들을 볼 때 정상 체온 체외순환 기법은 고령환자나 장시간 수술환자에 있어 일상적 방법으로 적용하기에 문제가 있을 것 같으며 중등도 저체온 체외순환이 정상 체온 체외순환보다 뇌대사 및 수술 후 신경학적 결과에 더 바람직 할 것으로 판단된다.

• 미술자료
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• 제97권
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• pp.14-54
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• 2020

용주사 <삼세불회도>에 대한 연구는 연대 추정과 양식 분석, 작가 비정, 문헌 해석의 네 가지 핵심 사항이 실증적인 근거와 일관된 논리 아래 모두 일치되도록 정합적으로 설명해야 한다. 그러나 최근의 용주사 <삼세불회도> 연구에서 제기된 19세기 후반 화승 제작설과 1790년에 제작된 원본을 1920년대에 일반화가가 서양화법으로 개채한 것이라는 소론은 실증성과 논리성이 결여되어 성립되기 어렵다. 현존 <삼세불회도>의 축원문(祝願文)은 세자(世子) 책봉을 받지 않은 원자(元子)만 있던 시기였음에도 불구하고 당시의 관습대로 의례적인 삼전(三殿) 축원문을 썼다가 이를 주사로 지우고 다시 "주상전하수만세(主上殿下壽萬歲), 자궁저하수만세(慈宮邸下壽萬歲), 왕비전하수만세(王妃殿下壽萬歲), 세자저하수만세(世子邸下壽萬歲)"라는 특별한 내용과 예외적인 순서로 개서(改書)했는데, 이는 조선후기 불화의 축원문 형식과 내용을 광범위하게 조사하고 정조대 왕실의 전례(典禮)를 면밀히 분석해 볼 때, 현존하는 <삼세불회도>가 1790년의 창건 당시에 그려졌던 원본 진작임을 말해주는 가장 확실한 객관적 근거라고 할 수 있다. 삼세불회도의 형식(形式)과 도상(圖像), 양식(樣式), 미감(美感), 화격(畫格) 등을 18~19세기 불화나 궁중화원 양식과 다각도로 비교분석해 보면 용주사 <삼세불회도>는 1790년경 전후에만 나타나는 특징이 많이 보이기 때문에 축원문(祝願文)에 대한 분석 결과와 일치한다. 특히 18세기 전반까지만 해도 종교적 위상에 따라 존상의 크기가 결정되고 화면 구성도 근하원상(近下遠上)의 고식(古式) 원근법에 따라 관념적, 평면적 조형 위주로 이루어져 왔으나 이 <삼세불회도>는 투시법적 원근법의 논리에 따라 구축된 입체적 공간 속에 존상들을 매우 체계적으로 배치한 뒤 서양화(西洋畫)의 음영식(陰影式) 명암법(明暗法)을 적극적으로 구사하며 흰색 하이라이트와 그림자까지 표현함으로써, 마치 삼세불회(三世佛會)의 장엄한 세계가 눈앞에 실제로 펼쳐져 있는 것 같은 느낌을 준다. 이 투시법적 원근법의 내적 질서와 음영식 명암법의 외적 착시는 골육합체(骨肉合體)처럼 내적으로 긴밀히 연결되어 있는 것이기 때문에 흰색 하이라이트만 떼어내서 후대에 개채된 것이라고 볼 수 있는 것이 결코 아니다. 더구나 이 <삼세불회도> 같은 고도의 서양화법과 높은 화격(畫格)의 창의적 융합은 조선후기 회화사상 김홍도와 이명기, 김득신 같은 정조대의 궁중화원만이 이룩할 수 있는 고도의 양식이자 화격이다. 용주사 주지 등운(等雲)이 창건 이래 용주사에 전해져온 기록을 토대로 『용주사사적(龍珠寺事蹟)』을 정리하며 김홍도가 <삼세불회도>를 그렸다고 기록한 것은 이것이 당시의 역사(歷史)이자 실상이었기 때문이다. 조정의 공식 기록인 『일성록(日省錄)』과 『수원부지령등록(水原府旨令謄錄)』에는 김홍도와 이명기, 김득신이 감동(監董)했다고 기록되어 있지만, 이는 의례 화승(畫僧)들이 그려왔던 불화를 관원 신분의 화원에게 그리도록 하는 것이 엄격한 관직 체제나 운영상 부당한 것이기 때문에 정치적 부담을 피하기 위해 명분상 감동으로 발령한 뒤 실제로는 불화를 직접 그리도록 했던 데서 나타난 결과였다. 영정조대의 어진(御眞) 도사 과정에서 감동으로 불러들인 문인화가 조영석(趙榮祏)과 강세황(姜世晃)에게 국왕이 직접 그릴 것을 요구했던 사례에서 볼 수 있듯이, '감동(監董)'과 '집필(執筆)'은 경우에 따라 경계를 넘나들 수 있는 개념으로서 '감동'이 '집필'을 완전히 배제하는 것은 아니며 겸할 수도 있는 것이다. 그런 점에서 『용주사사적』의 기록은 『일성록』이나 『수원부지령등록』은 물론 황덕순의 「닫집 원문」 기록과도 모순되는 것이 아니라, 행간의 의미를 찾아 복합적으로 읽으면 각각의 맥락과 필요에 따라 동일한 내용의 표리를 다르게 기록해 놓은 것임을 알 수 있다. 이렇게 해석할 때 우리는 용주사 <삼세불회도>의 연대 추정과 양식 분석, 작가 비정, 문헌 해석의 네 가지 핵심 사항을 모두 실증적인 근거와 일관된 논리 아래 정합적으로 설명할 수 있을 것이다.

• 동양고전연구
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• 제49호
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• pp.73-107
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• 2012

여헌 장현광(1554-1637)은 조선중기를 대표하는 유학자이면서 우주론과 자연학을 가장 체계적으로 저술한 사람이다. 조선조 유학의 지리적인 학맥에서 여헌은 남명 조식과 한강 정구의 학풍을 이어받으면서 풍수와 지지편찬을 계승한 사람으로 자리매김 될 수 있다. 여헌은 주자학에 영향을 받았지만 역학(易學)의 기틀을 견지하였으며, 사변적인 공리공론에 머무르지 않고 실용적 경세학(經世學)으로서의 지리를 인식하였다. 여헌의 지리인식 방법은 역학(易學)의 체계와 구도 상에서 이루어졌다. 여헌은 자연에 대한 인간 본위(本位)의 인식태도를 드러내며, 따라서 인사의 공능이 지리의 조건보다 우선되는 준칙이었다. 여헌에게 산수와 자연은 비덕(比德)의 공부대상이었고, 자연공부 방법은 대상물의 관찰을 통해 생명의 이치를 자득하고, 무심한 경지를 통해 천지의 마음에 이르는 것이었다. 유학의 가르침을 삶의 지침으로 삼았던 여헌에게 있어서 낙토(樂土)는 안분자족(安分自足)함에서 얻어지는 것이었다. 여헌에게 지리인식의 의의는 생활의 실용적인 이익 됨에 목적을 둔 필수적인 지식정보였다. 여헌은 은거지의 생활현장에 자신이 견지한 유학적 우주관과 세계관을 '우주사업'의 일환으로 구현하였다. 이러한 의식과 태도는 주거지의 장소경관과 자연경물(自然景物)을 북극성과 주위 28수의 별자리로 상징화하여 명명하고 우주적 중심 공간으로 구성하는 방식으로 나타났다. 주자의 무이구곡(武夷九曲) 경영에서 비롯된 유학자들의 동천구곡(洞天九曲) 전통은 조선시대에 유행되었지만, 여헌의 장소 구성 체계는 여타의 형태와 방식을 뛰어넘은 우주적 구도의 독창성이 있다. 여헌의 장소 명명 의식에는 선현을 본받고자하는 태도, 자연물의 형용과 성정에 대한 비덕(比德), 그리고 은거(隱居) 의식의 반영이 나타난다. 여헌의 국토관 및 국토이해는 지형개관, 산수이해, 도읍입지, 지역이해, 풍토론, 현실인식의 방식으로 체계적으로 드러나고 중국의 지리적 조건과도 비교되어 파악되었다. 그의 국토인식과 이해방식은, 국토의 유기체적인 인식, 주자학의 자연관이 반영된 기적(氣的)인 국토인식, 산천 인식과 도읍 입지의 풍수적 이해, 지역구분을 통한 비교론적 이해, 인물과 풍속에 대한 풍토론적 이해 방식 등으로 요약할 수 있다. 여헌은 역의 포괄적인 사상체계 범주에서 풍수도 수용하였다. 그가 풍수를 수용할 수 있었던 배경에는 남명과 한강을 계승하는 학풍에서 연유되는 바가 있었다. 여헌은 풍수지식을 활용하여 주거지의 입지를 정하기도 하였고, 고향 연고지의 여러 곳에 대해 풍수적 견지로 언급하기도 했다. 그의 풍수관을 보면, 묘지풍수에서 형세론적 이치는 수긍하고 있지만 장례기일을 미루는 발복 목적의 행위는 비판하였다. 그리고 고을의 풍수에서 숲의 조성을 통한 비보의 필요성을 인정하였다. 이러한 풍수관은 문도(門徒)들의 지지편찬에도 일정하게 반영되었다. 여헌 학풍에서 주목할 만한 지리학적 특징으로 꼽을 수 있는 것이 지지(地誌)의 편찬이다. 이것은 남명과 한강의 치용(治用) 정신과 경세적(經世的) 실천을 계승한 학풍이기도 했다. 여헌은 지지를 중요시하게 생각하면서 문인들에게 편찬을 독려하였다. 고을의 통치자나 지식인으로서 지역의 역사와 옛 일을 잘 알아야하고, 권면하고 징계하는 기준이 마련될 필요가 있다는 것이다. 이러한 여헌의 견해는 이후 문인들의 지지편찬 취지와 내용 구성에 지침이 되었다. 이 연구는 여헌의 지리인식에 관한 사실적인 면모의 정리와 지리적 학풍의 계승 맥락에 관한 고찰에 그친 한계가 있다. 다음에는 여헌 전후 유학자들의 지리인식과 지지편찬 전통이 어떻게 전승되면서 전개 발전되었고 질적으로 변천해 나갔는지를 살피고자 한다. 이러한 연구는 학계에서 공백으로 남아있는 조선 초 중기 유교지식인의 지리학사를 정립하는데 일조할 수 있으리라 믿는다.

• Asia Marketing Journal
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• 제14권1호
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• pp.83-98
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• 2012

신차와 중고차가 함께 경쟁하는 시장에서 신차의 경쟁만을 모형화한다면 가격이나 기타 프로모션 탄력성의 추정이 왜곡될 수 있다. 그러나 자동차 시장을 연구대상으로 한 선행연구의 대부분이 신차 시장의 경쟁에만 관심을 기울였던 바, 합리적인 가격결정이나 프로모션 기획에 도움을 주기에 미흡한 점이 있었다. 본 연구는 신차의 가격결정 및 프로모션 기획이 향후 중고차 시장을 통해 리바운드되어 신차 매출에 다시 영향을 미친다는 점을 반영하여 모형을 설정하였다. 즉, 서로 다른 신차간의 (혹은 서로 다른 중고차간의) 교차탄력성보다, 동일 모델의 신차와 중고차간의 교차탄력성이 높다는 가정하에 모형을 설정하였다. 방법론적으로는 네스티드 로짓(Nested Logit) 모형을 설정하여 소비자의 자동차 선택은 단계적으로 이루어진다고 가정하였다. 즉, 1단계에서 자동차 모델을 선택하고, 모델이 정해지면 2단계에서 신차와 중고차 중 선택하는 구조를 가정하였다 실증분석은 미국 전역에서 2009년 1월부터 2009년 6월까지 판매된 모든 컴팩트 카 모델 중에서 시장점유율 상위 9개 모델의 신차와 중고차를 대상으로 하였다. 실증분석을 통하여 비교 대상 모형보다 제안된 모형이 모형 적합도 측면에서 우월하고 예측타당성도 높다는 것을 보여주었다. 제안된 모형으로 부터 추정된 모수를 사용하여 몇 가지 시나리오를 상정하여 시뮬레이션을 실시한 결과, 신차(중고차)가 점유율을 높이고자 리베이트를 실시할 경우 중고차(신차)는 현재의 시장점유율을 유지하기 위해 대응 가격할인을 실시하게 되는데 할인 폭은 반대의 경우에 비해 높다는(낮다는)점을 확인하였다. 또한 시뮬레이션 결과가 시사하는 바는 신차와 중고차가 함께 경쟁하는 시장에서 IIA(Independence of Irrelevant Alternatives)모형을 적용할 경우 동일모델의 신차와 중고차간의 교차 탄력성을 과소평가하게 되어 현상유지를 위한 가격할인을 실시할 경우 적정한 수준이하로 하게 된다는 것이다.

• Asia Marketing Journal
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• 제14권2호
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• pp.209-237
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• 2012

오늘날의 소비자들은 가격, 제품의 품질 등 실용적 가치 보다 쇼핑의 즐거움, 라이프스타일의 구현, 매력적인 점포쇼핑환경, 브랜드 애착심 등의 정서적 가치를 더 중요하게 생각하고 있다. 이처럼 소비자들은 단순히 상품만을 구매하기보다는 다양한 가치를 얻기 위해 쇼핑을 한다는 사실은 여러 연구에서 제안되었다(안광호와 이하늘 2011; Mathwick 등 2001). 이렇듯 소매점포 선택과 관련한 소비자행동차원의 쇼핑경험가치와 브랜드자산에 대한 중요성과 관심이 높아지고 있지만 관련 연구는 미미한 실정이며 이와 관련한 비교문화적 연구는 매우 미비한 실정이다(황순호 2010). 본 연구는 한국과 중국의 소비자들의 소매점포 선택과 관련한 소비자행동연구의 필요에 의해 시작되었다. 또한 소비자행동분야에서 소비자 경험이 중시되면서 소매점내 쇼핑경험가치에 초점을 맞추었다. 본 연구는 정치, 경제, 사회, 문화적으로 서로 다른 한국과 중국의 소비자들을 대상으로 대형할인점 소매점포에서 고객들이 지각하는 쇼핑 경험가치와 브랜드자산과의 관계를 밝혀내고 이를 통해 점포 충성도와의 관계를 찾아내어 소매점의 쇼핑 경험가치와 관련된 시사점을 찾아내기 위한 국가 간 비교 연구를 시도하였다. 본 연구는 이론적 배경으로 쇼핑가치와 유통브랜드 자산, 그리고 점포 충성도에 대한 이론적 배경을 소개하였으며, 가설 검증을 위한 자료 수집을 위하여 한국과 중국의 대형할인점 고객들을 대상으로 한국과 중국의 대도시 (서울 과 북경) 소비자들을 표본프레임으로 설정하고, 대면 설문조사를 실시하였다. 연구의 결과 한중간 소비성향 차이 비교에 대한 결과를 요약하면 다음과 같다. 첫째, 한국소비자와 중국 소비자 간의 소비성향차이를 검정한 결과 중국 소비자들은 심미적 소비성향과 상징적 소비성향의 평균값이 한국 소비자들에 비해 높게 나타났으며 한국 소비자들은 쾌락적 소비성향이 중국소비자들에 비해 상대적으로 높은 것으로 나타났다. 둘째, 대형할인점에 대한 한국과 중국의 브랜드 자산 지각에 대한 연구결과 중국에 비해 한국 소비자들이 브랜드 인지와 브랜드 이미지를 모두 높게 지각하는 것으로 나타났다. 셋째, 한국과 중국에서 편의점과 할인점 이용 고객들이 지각하는 소매점에서의 쇼핑경험에 대한 탐색적 요인분석결과 각각의 국가에 따라 각기 다른 쇼핑경험가치가 나타났다. 한국의 할인점에서는 소비자이익 가치, 심미성가치, 유희성 가치가 중요한 쇼핑가치로 도출되었다. 또한 중국의 할인점에서는 유희성 가치, 심미성 가치, 소비자이익 가치, 서비스우수 가치가 중요한 쇼핑경험가치로 도출되었다. 이러한 연구의 목적에 대한 실증적 분석을 바탕으로 한국과 중국의 대형할인점 소비자들의 쇼핑경험가치과 브랜드자산을 바탕으로 한국의 대형할인점에 있어서 경험가치의 이론적 중요성에 관한 새로운 통찰력을 제공하여 주며 충성도 제고에 있어서 브랜드관리의 중요성에 대한 이론적 시사점을 제공하여 준다. 이와 더불어 유통의 국제화 시대에 있어서 대형할인점의 국제화에 요구되는 한국과 중국 간의 고객 가치의 차이점에 대한 비교문화적 관점에서 중요한 실무적 시사점을 제시한다. 즉, 해외유통전략을 실행하는데 있어서 쇼핑가치에 기반한 현지화 전략의 중요성에 대한 시사점을 제시하여 주며 국가차원에서의 차별적 유통전략의 개발 필요성을 제안하여 준다.

• 한국심리학회지 : 문화 및 사회문제
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• 제12권5호_spc
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• pp.81-98
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• 2006

본 연구의 목적은 한국, 일본, 중국 유아들의 일상생활을 비교문화적으로 탐구하는 데에 있다. 이러한 연구목적을 달성하기 위해 본 연구는 한국, 일본, 중국의 3-6세 유아를 이머니 2,940명을 대상으로 유아의 하루일과 활동들을 설문지를 통해 조사하였다. 조사대상자들은 한국의 서울/경기에 거주하는 어머니 941명, 일본의 동경에 거주하는 어머니 1007명, 중국의 북경에 거주하는 어머니 992명이었다. 연구 결과 첫째, 하루일과 부분에 있어서 한국 유아들은 일본, 중국 유아들에 비해 기상시각 아침 및 저녁식사시각 취침시각이 모두 늦게 이루어지며, 수면시간 또한 일본, 중국외 유아들에 비해 짧은 편으로 나타났다. 둘째, 교육기관 부분에 있어서 중국, 일본, 한국 유아들 순으로 교육기관에 등원하였으며, 일본, 한국, 중국 순으로 귀가하는 것으로 나타났다. 평균 교육기관 재원시간은 중국이 가장 길었으며, 그 다음으로 일본의 보육시설, 한국의 보육시설, 한국과 일본의 유치원 순으로 나타났다. 또한 어머니들이 교육기관에 바라는 사항을 살펴본 결과 아이가 아플 때에도 교육기관에서 맡아주기를 가장 희망하였다. 셋째, 조사대상 유아들 중 한국은 72.6%가, 일본은 61.7%, 중국은 64.6%가 정규교육 이외의 조기 특기활동을 하고 있는 것으로 나타났으며, 그 활동유형으로 세 국가 모두 예체능 관련 활동과 영어를 많이 하고 있었는데, 한국은 학습지를 하는 비율이 일본, 중국에 비해 월등히 높게 나타났다. 넷째, 전자매체 사용에 있어서는 한국, 일본, 중국의 대다수 유아들이 거의 매일 텔레비전을 시청하고 있었으며, 게임은 일본 유아들이, 컴퓨터는 한국 유아들이 사용 비율이 높은 것으로 나타났다. 전자매체의 경우 상대적으로 중국 유아들이 한국, 일본 유아들에 비해 그 사용비율이 현저히 낮았다.

• 대한의용생체공학회:의공학회지
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• 제6권2호
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• pp.1-8
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• 1985

The wall shear stress in the vicinity of end-to end anastomoses under steady flow conditions was measured using a flush-mounted hot-film anemometer(FMHFA) probe. The experimental measurements were in good agreement with numerical results except in flow with low Reynolds numbers. The wall shear stress increased proximal to the anastomosis in flow from the Penrose tubing (simulating an artery) to the PTFE: graft. In flow from the PTFE graft to the Penrose tubing, low wall shear stress was observed distal to the anastomosis. Abnormal distributions of wall shear stress in the vicinity of the anastomosis, resulting from the compliance mismatch between the graft and the host artery, might be an important factor of ANFH formation and the graft failure. The present study suggests a correlation between regions of the low wall shear stress and the development of anastomotic neointimal fibrous hyperplasia(ANPH) in end-to-end anastomoses. 30523 T00401030523 ^x Air pressure decay(APD) rate and ultrafiltration rate(UFR) tests were performed on new and saline rinsed dialyzers as well as those roused in patients several times. C-DAK 4000 (Cordis Dow) and CF IS-11 (Baxter Travenol) reused dialyzers obtained from the dialysis clinic were used in the present study. The new dialyzers exhibited a relatively flat APD, whereas saline rinsed and reused dialyzers showed considerable amount of decay. C-DAH dialyzers had a larger APD(11.70$\pm$1.32mmHg/min)compared to CF dialyzers(4.32$\pm$0.55mmHg/min)(p<0.05). However, there was no observable difference in the UFR between the two dialyzers. Neither APD nor UFR showed any significant increase with an increasing number of reuses for up to more than 20reuses. A substantial number of failures observed in APD(larger than 20mmHe/min)on the reused dialyzers(2 out of 40 CP and S out 26 C-DAK) were attributed to the Possible damage on the fibers. The CF 15-11 HFDs which failed APD test did not show changes in the UFR compared to normal dialyzers indicating that APD is a more sensitive test than UFR test to evaluate the integrity of the fibers. 30527 T00401030527 ^x For quantitative measurement of reflected light from a clinical diagnostic strip, a prototype old reflectance photometer was designed. The strip loader and cassette were made to obtain more accurate reflectance parameters. The strip was illuminated at 45˚c through optical fiber and the intensity of reflected light was determined at rectanguLat angle using a photodiode. The kubelka-munk coefficient and reflection optical density were determined ar four different wavelengths(500, 550, 570 and 610nm) for blood glucose strip. For higher concentration than 300mg/41 about glucose, a saturation state of abforbance was observed at 500, 550 and 570nm. The correlation between glucose concentration and parameters was the best at 610nm. 30535 T00401030535 ^x Radiation-induced fibrosarcoma tumors were grown on the flanks of C3H mice. The mice were divided into two groups. One group was injected with Photofrin II, intravenously (2.5mg/kg body weight). The other group received no Photofrin II. Mice from both groups were irradialed for approximately 15 minutes at 100, 300, or 500 mW/cm2 with the argon (488nm/514.5 nm), dye(628nm) and gold vapor (pulsed 628 nm) laser light. A photosensitizer behaved as an added absorber. Under our experimental conditions, the presence of Photolfrin II increased surface temperature by at least 40% and the temperature rise due to 300 mW/cm2 irradiation exceeded values for hyperthermia. Light and temperature distributions with depth were estimated by a computer model. The model demonstrated the influence of wavelength on the thermal process and proved to be a valuable tool to investigate internal temperature rise. 30536 T00401030536 ^x We investigated the structural geometry of thirty-eight Korean femurs. The purpose of this study is to identify major geometrical differences between Korean femurs 3nd others that we believe belong to Caucasians so that we would be able to get insights into the femoral component design that fits Asians including Koreans. We utilized computerized tomography (CT) images of femurs extracted from cadavers. The CT images were transformed into bitmap data by using a film scanner, and then analyzed by using a commercially available software called Image v.1.0 and a Macintosh IIci computer.The resulting data were compared with already published data. The major results show that the geometry of the Korean femurs is significantly different from that of Caucasians: (1) the anteversion angle and the canal flare index are greater by the amount of approximately 8˚ and 0.5, respectively, (2) the shape of the isthmus cross section is more round, and (3) the distance between the teaser trochanter and the proximal border of the isthmus is shelter by about 15 mm. The results suggested that the femoral component suitable for Asians should be different from the currently-used components designed and manufactured mostly by European or American companies. 30537 T00401030537 ^x It is well known that nonlinear propagation characteristics of the wave in the tissue may give very useful information for the medical diagnoisis. In this paper, a new method to detect nonlinear propagation characteristics of the internal vibration in the tissue for the low frequency mechanical vibration by using bispectral analysis is proposed. In the method, low frequency vibration of f0( = 100Hz) is applied on the surface of the object, and the waveform of the internal vibration x (t) is measured from Doppler frequency modulation of silmultaneously transmitted probing ultrasonic waves. Then, the bispectra of the signal x (t) at the frequencies (f0, f0) and (f0, 2f0) are calculated to estimate the nonlinear propagation characteristics as their magnitude ratio, w here since bispectrum is free from the gaussian additive noise we can get the value with high S/N. Basic experimental system is constructed by using 3.0 MHz probing ultrasonic waves and the several experiments are carried out for some phantoms. Results show the superiority of the proposed method to the conventional method using power spectrum and also its usefulness for the tissue characterization. 30541 T00401030541 ^x This paper describes the implementation of a computerized radial pulse diagnosis by aids of a clinical expert. On this base, we composed of the radial pulse diagnosis system in korean traditional medicine. The system composed of a radial pulse wave detection system and a radial pulse diagnosis system. With a detection system, we detected Inyoung and Cheongu radial pulse wave and processed it. Then, we have got the characteristic parameters of radial pulse wave and also quantified that according to the method of Inyoung-Cheongu Comparison Radial Pulse Diagnosis. We defined the jugement standard of radial pulse diagnosis system and then we confirmed the possibility for realization of automatic radial pulse diagnosis in korean traditional medicine. 30545 T00401030545 ^x Microspheres are expected to be applied to biomedical areas such as solid-phase immunoassays, drug delivery systems, immunomagnetic cell separation. To synthesize microspheres for biomedical application, "two stage shot growth method" was developed. The uniformity ratio of synthesized microspheres was always smaller than 1.05. And the surface charge density (or the number of ionizable functional groups) of the microspheres synthesized by "two stage shot growth method" was 6~13 times higher than that of the microspheres synthesized by conventional seeded batch copolymerization. As a previous step for biomedical application, adsorption experiments of bovine albumin on microspheres were carried out under various conditions. The maximum adsorbed amount was obtained in the neighborhood of pH 4.5. Isoelectric point of bovine albumin is pH 5.0, so experimental result shows that it shifted to acid area. The adsorption isotherm was obtained, the plateau region was always reached at 2.Og/L (bulk concentration of bovine albumin).The effect of the kind and the amount of surface functional group was also examined. 30575 T00401030575 ^x A medical image workstation was developed using multimedia technique. The system based on PC-486DX was designed to acquire medical images produced by medical imaging instruments and related audio information, that is, doctors' reporting results. Input information was processed and analyzed, then the results were presented in the form of graph and animation. All the informations of the system were hierarchically related with the image as the apex. Processing and analysis algorithms were implemented so that the diagnostic accuracy could be improved. The diagnosed information can be transferred for patient diagnosis through LAN(local area network). 30592 T00401030592 ^x In the conventional infrared imaging system, complex infrared lens systems are usually used for directing collimated narrow infrared beams into the high speed 2-dimensional optic scanner. In this paper, a simple reflective infrared optic system with a 2-dimensional optic scanner is proposed for the realization of medical infrared thermography system. It has been experimentally proven that the intfrared thermography system composed of the proposed optic system has the temperature resolution of 0.1˚c under the spatial resolution of lmrad, the image matrix size of 256 X 240, and tile imaging time of 4 seconds. 30593 T00401030593 ^x In this paper, MIIS (Medical Image Information System) has been designed and implemented using INGRES RDBMS, which is based on a client/server architecture. The implemented system allows users to register and retrieve patient information, medical images and diagnostic reports. It also provides the function to display these information on workstation windows simultaneously by using the designed menu-driven graphic user interface. The medical image compression/decompression techniques are implemented and integrated into the medical image database system for the efficient data storage and the fast access through the network. 30594 T00401030594 ^x In this paper, computerized BEAM was implemented for the space domain analysis of EEG. Trans-formation from temporal summation to two-dimensional mappings is formed by 4 nearest point inter-polaton method. Methods of representation of BEAM are two. One is dot density method which classify brain electrical potential 9 levels by dot density of gray levels and the other is colour method which classify brain electrical 12 levels by red-green colours. In this BEAM, instantaneous change and average energy distribution over any arbitrary time interval of brain electrical activity could be observed and analyzed easily. In the frequency domain, the distribution of energy spectrum of a special band can easily be distinguished normality and abnormality. 30608 T00401030608 ^x Laboratory information system (LIS) is a key tool to manage laboratory data in clinical pathology. Our department has developed an information system for routine hematology using down-sized computer system. We have used an IBM 486 compatible PC with 16MB main memory, 210 MB hard disk drive, 9 RS-232C port and 24 pin dot printer. The operating system and database management system were SCO UNIX and SCO foxbase, respectively. For program development, we used Xbase language provided by SCO foxbase. The C language was used for interface purpose. To make the system use friendly, pull-down menu was used. The system connected to our hospital information system via application program interface (API), so the information related to patient and request details is automatically transmitted to our computer. Our system interfaced with fwd complete blood count analyzers(Sysmex NE-8000 and Coulter STKS) for unidirectional data tansmission from analyzer to computer. The authors suggests that this system based on down-sized computer could provide a progressive approach to total LIS based on local area network, and the implemented system could serve as a model for other hospital's LIS for routine hematology. 30609 T00401030609 ^x To develop an artificial bone substitute that is gradually degraded and replaced by the regenerated natural bone, the authors designed a composite that is consisted of calcium phosphate and collagen. To use as the structural matrix of the composite, collagen was purified from human umbilical cord. The obtained collagen was treated by pepsin to remove telopeptides, and finally, the immune-free atelocollagen was produced: The cross linked atelocollagen was highly resistant to the collagenase induced collagenolysis. The cross linked collagen demonstrated an improved tensile strength. 30618 T00401030618 ^x This paper is a study on the design of adptive filter for QRS complex detection. We propose a simple adaptive algorithm to increase capability of noise cancelation in QRS complex detection with two stage adaptive filter. At the first stage, background noise is removed and at the next stage, only spectrum of QRS complex components is passed. Two adaptive filters can afford to keep track of the changes of both noise and QRS complex. Each adaptive filter consists of prediction error filter and FIR filter The impulse response of FIR filter uses coefficients of prediction error filter. The detection rates for 105 and 108 of MIT/BIH data base were 99.3% and 97.4% respectively. 30619 T00401030619 ^x To develop an artificial bone substitute that is gradually degraded and replaced by the regenerated natural bone, the authors designed and produced a composite that is consisted of calcium phosphate and collagen. Human umbilical cord origin pepsin treated type I atelocollagen was used as the structural matrix, by which sintered or non-sintered carbonate apatite was encapsulated to form an inorganic-organic composite. With cross linking atelocollagen by UV ray irradiation, the resistance to both compressive and tensile strength was increased. Collagen degradation by the collagenase induced collagenolysis was also decreased. 30620 T00401030620 ^x We have developed a monoleaflet polymer valve as an inexpensive and viable alternative, especially for short-term use in the ventricular assist device or total artificial heart. The frame and leaflet of the polymer valve were made from polyurethane, To evaluate the hemodynamic performance of the polymer valve a comparative study of flow dynamics past a polymer valve and a St. Jude Medical prosthetic valve under physiological pulsatile flow conditions in vitro was made. Comparisons between the valves were made on the transvalvular pressure drop, regurgitation volume and maximum valve opening area. The polymer valve showed smaller regurgitation volume and transvalvular pressure drop compared to the mechanical valve at higher heart rate. The results showed that the functional characteristics of the polymer valve compared favorably with those of the mechanical valve at higher heart rate. 30621 T00401030621 ^x Explosive evaporative removal process of biological tissue by absorption of a CW laser has been simulated by using gelatin and a multimode Nd:YAG laser. Because the point of maximun temperature of laser-irradiated gelatin exists below the surface due to surface cooling, evaporation at the boiling temperature is made explosively from below the surface. The important parameters of this process are the conduction loss to laser power absorption (defined as the conduction-to-laser power parameter, Nk), the convection heat transfer at the surface to conduction loss (defined as Bi), dimensionless extinction coefficient (defined as Br.), and dimensionless irradiation time (defined as Fo). Dependence of Fo on Nk and Bi has been observed by experiment, and the results have been compared with the numerical results obtained by solving a 2-dimensional conduction equation. Fo and explosion depth (from the surface to the point of maximun temperature) are increased when Nk and Bi are increased.To find out the minimum laser power for explosive evaporative removal process, steady state analysis has been also made. The limit of Nk to induce evaporative removal, which is proportional to the inverse of the laser power, has been obtained. 30622 T00401030622 ^x N1 and N2 gross neural action potentials were measured from the round window of the guinea pig cochlea at the onset of the acoustic stimuli. N1-N2 audiograms were made by means of regulating stimulant intensities in order to produce constant N1-N2 potentials as criteria for different input tone pip frequencies. The lowest threshold was measured with an input tone pip I5 dB SPL in intensity and 12 KHz in frequency when the animal was in normal physiological condition. The procedure of experimental measurements is explained in detail. This experimental approach is very useful for the investigation of the Cochlear function. Both noN1inear and active functions of the Cochlea can be monitored by N1-N2 audiograms. 30623 T00401030623 ^x In electrical impedance tomography(EIT), we use boundary current and voltage measurements toprovide the information about the cross-sectional distribution of electrical impedance or resistivity. One of the major problems in EIT has been the inaccessibility of internal voltage or current data in finding the internal impedance values. We propose a new image reconstruction method using internal current density data measured by NMR. We obtained a two-dimensional current density distribution within a phantom by processing the real and imaginary MR images from a 4.77 NMR machine. We implemented a resistivity mage reconstruction algorithm using the finite element method and sensitivity matrix. We presented computer simulation results of the mage reconstruction algorithm and furture direction of the research. 30624 T00401030624 ^x A new method of digital image analysis technique for discrimination of cancer cell was presented in this paper. The object image was the Thyroid eland cells image that was diagnosed as normal and abnormal (two types of abnormal: follicular neoplastic cell, and papillary neoplastic cell), respectively. By using the proposed region segmentation algorithm, the cells were segmented into nucleus. The 16 feature parameters were used to calculate the features of each nucleus. A9 a consequence of using dominant feature parameters method proposed in this paper, discrimination rate of 91.11% was obtained for Thyroid Gland cells. 30625 T00401030625 ^x An electrical stimulator was designed to induce locomotion for paraplegic patients caused by central nervous system injury. Optimal stimulus parameters, which can minimize muscle fatigue and can achieve effective muscle contraction were determined in slow and fast muscles in Sprague-Dawley rats. Stimulus patterns of our stimulator were designed to simulate electromyographic activity monitored during locomotion of normal subjects. Muscle types of the lower extremity were classified according to their mechanical property of contraction, which are slow muscle (msoleus m.) and fast muscle (medial gastrocneminus m., rectus femoris m., vastus lateralis m.). Optimal parameters of electrical stimulation for slow muscles were 20 Hz, 0.2 ms square pulse. For fast muscle, 40 Hz, 0.3 ms square pulse was optimal to produce repeated contraction. Higher stimulus intensity was required when synergistic muscles were stimulated simultaneously than when they were stimulated individually. Electrical stimulation for each muscle was designed to generate bipedal locomotion, so that individual muscles alternate contraction and relaxation to simulate stance and swing phases. Portable electrical stimulator with 16 channels built in microprocessor was constructed and applied to paraplegic patients due to lumbar cord injury. The electrical stimulator restored partially gait function in paraplegic patients. 30626 T00401030626 ^x Two-Dimensional modelling of the Cochlear biomechanics is presented in this paper. The Laplace partial differential equation which represents the fluid mechanics of the Cochlea has been transformed into two-dimensional electrical transmission line. The procedure of this transformation is explained in detail. The comparison between one and two dimensional models is also presented. This electrical modelling of the basilar membrane (BM) is clearly useful for the next approach to the further. Development of active elements which are essential in the producing of the sharp tuning of the BM. This paper shows that two-dimension model is qualitatively better than one-dimensional model both in amplitude and phase responses of the BM displacement. The present model is only for frequency response. However because the model is electrical, the two-dimensional transmission line model can be extended to time response without any difficult. 30627 T00401030627 ^x A method has been proposed for the fully automatic detection of left ventricular endocardial boundary in 2D short axis echocardiogram using geometric model. The procedure has the following three distinct stages. First, the initial center is estimated by the initial center estimation algorithm which is applied to decimated image. Second, the center estimation algorithm is applied to original image and then best-fit elliptic model estimation is processed. Third, best-fit boundary is detected by the cost function which is based on the best-fit elliptic model. The proposed method shows effective result without manual intervention by a human operator. 30628 T00401030628 ^x The intelligent trajectory control method that controls moving direction and average velocity for a prosthetic arm is proposed by pattern recognition and force estimations using EMG signals. Also, we propose the real time trajectory planning method which generates continuous accelleration paths using 3 stage linear filters to minimize the impact to human body induced by arm motions and to reduce the muscle fatigue. We use combination of MLP and fuzzy filter for pattern recognition to estimate the direction of a muscle and Hogan's method for the force estimation. EMG signals are acquired by using a amputation simulator and 2 dimensional joystick motion. The simulation results of proposed prosthetic arm control system using the EMf signals show that the arm is effectively followed the desired trajectory depended on estimated force and direction of muscle movements. 30638 T00401030638 ^x A new neural network architecture for the recognition of patterns from images is proposed, which is partially based on the results of physiological studies. The proposed network is composed of multi-layers and the nerve cells in each layer are connected by spatial filters which approximate receptive fields in optic nerve fields. In the proposed method, patterns recognition for complicated images is carried out using global features as well as local features such as lines and end-points. A new generating method of matched filers representing global features is proposed in this network. 30659 T00401030659 ^x An implementation scheme of the magnetic nerve stimulator using a switching mode power supply is proposed. By using a switching mode power supply rather than a conventional linear power supply for charging high voltage capacitors, the weight and size of the magnetic nerve stimulator can be considerably reduced. Maximum output voltage of the developed magnetic nerve stimulator using the switching mode power supply is 3, 000 volts and switching time is about 100 msec. Experimental results or human nerve stimulations using the developed stimulator are presented. 30768 T00401030768 ^x In this paper, we describe the design methodology and specifications of the developed module-based bedside monitors for patient monitoring. The bedside monitor consists of a main unit and module cases with various parameter modules. The main unit includes a 12.1" TFT color LCD, a main CPU board, and peripherals such as a module controller, Ethernet LAN card, video card, rotate/push button controller, etc. The main unit can connect at maximum three module cases each of which can accommodate up to 7 parameter modules. They include the modules for electrocardiograph, respiration, invasive blood pressure, noninvasive blood pressure, temperature, and SpO2 with Plethysmograph.SpO2 with Plethysmograph.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
• /
• 한국우주과학회 1993년도 한국우주과학회보 제2권2호
• /
• pp.17-17
• /
• 1993

The wall shear stress in the vicinity of end-to end anastomoses under steady flow conditions was measured using a flush-mounted hot-film anemometer(FMHFA) probe. The experimental measurements were in good agreement with numerical results except in flow with low Reynolds numbers. The wall shear stress increased proximal to the anastomosis in flow from the Penrose tubing (simulating an artery) to the PTFE: graft. In flow from the PTFE graft to the Penrose tubing, low wall shear stress was observed distal to the anastomosis. Abnormal distributions of wall shear stress in the vicinity of the anastomosis, resulting from the compliance mismatch between the graft and the host artery, might be an important factor of ANFH formation and the graft failure. The present study suggests a correlation between regions of the low wall shear stress and the development of anastomotic neointimal fibrous hyperplasia(ANPH) in end-to-end anastomoses. 30523 T00401030523 ^x Air pressure decay(APD) rate and ultrafiltration rate(UFR) tests were performed on new and saline rinsed dialyzers as well as those roused in patients several times. C-DAK 4000 (Cordis Dow) and CF IS-11 (Baxter Travenol) reused dialyzers obtained from the dialysis clinic were used in the present study. The new dialyzers exhibited a relatively flat APD, whereas saline rinsed and reused dialyzers showed considerable amount of decay. C-DAH dialyzers had a larger APD(11.70${\pm}$1.32mmHg/min)compared to CF dialyzers(4.32${\pm}$0.55mmHg/min)(p<0.05). However, there was no observable difference in the UFR between the two dialyzers. Neither APD nor UFR showed any significant increase with an increasing number of reuses for up to more than 20reuses. A substantial number of failures observed in APD(larger than 20mmHe/min)on the reused dialyzers(2 out of 40 CP and S out 26 C-DAK) were attributed to the Possible damage on the fibers. The CF 15-11 HFDs which failed APD test did not show changes in the UFR compared to normal dialyzers indicating that APD is a more sensitive test than UFR test to evaluate the integrity of the fibers. 30527 T00401030527 ^x For quantitative measurement of reflected light from a clinical diagnostic strip, a prototype old reflectance photometer was designed. The strip loader and cassette were made to obtain more accurate reflectance parameters. The strip was illuminated at 45˚c through optical fiber and the intensity of reflected light was determined at rectanguLat angle using a photodiode. The kubelka-munk coefficient and reflection optical density were determined ar four different wavelengths(500,550,570 and 610nm) for blood glucose strip. For higher concentration than 300mg/41 about glucose, a saturation state of abforbance was observed at 500,550 and 570nm. The correlation between glucose concentration and parameters was the best at 610nm. 30535 T00401030535 ^x Radiation-induced fibrosarcoma tumors were grown on the flanks of C3H mice. The mice were divided into two groups. One group was injected with Photofrin II, intravenously (2.5mg/kg body weight). The other group received no Photofrin II. Mice from both groups were irradialed for approximately 15 minutes at 100,300, or 500 mW/cm2 with the argon (488nm/514.5 nm), dye(628nm) and gold vapor (pulsed 628 nm) laser light. A photosensitizer behaved as an added absorber. Under our experimental conditions, the presence of Photolfrin II increased surface temperature by at least 40% and the temperature rise due to 300 mW/cm2 irradiation exceeded values for hyperthermia. Light and temperature distributions with depth were estimated by a computer model. The model demonstrated the influence of wavelength on the thermal process and proved to be a valuable tool to investigate internal temperature rise. 30536 T00401030536 ^x We investigated the structural geometry of thirty-eight Korean femurs. The purpose of this study is to identify major geometrical differences between Korean femurs 3nd others that we believe belong to Caucasians so that we would be able to get insights into the femoral component design that fits Asians including Koreans. We utilized computerized tomography (CT) images of femurs extracted from cadavers. The CT images were transformed into bitmap data by using a film scanner, and then analyzed by using a commercially available software called Image v.1.0 and a Macintosh IIci computer.The resulting data were compared with already published data. The major results show that the geometry of the Korean femurs is significantly different from that of Caucasians: (1) the anteversion angle and the canal flare index are greater by the amount of approximately 8˚ and 0.5, respectively, (2) the shape of the isthmus cross section is more round, and (3) the distance between the teaser trochanter and the proximal border of the isthmus is shelter by about 15 mm. The results suggested that the femoral component suitable for Asians should be different from the currently-used components designed and manufactured mostly by European or American companies. 30537 T00401030537 ^x It is well known that nonlinear propagation characteristics of the wave in the tissue may give very useful information for the medical diagnoisis. In this paper, a new method to detect nonlinear propagation characteristics of the internal vibration in the tissue for the low frequency mechanical vibration by using bispectral analysis is proposed. In the method, low frequency vibration of f0( = 100Hz) is applied on the surface of the object, and the waveform of the internal vibration x (t) is measured from Doppler frequency modulation of silmultaneously transmitted probing ultrasonic waves. Then, the bispectra of the signal x (t) at the frequencies (f0, f0) and (f0, 2f0) are calculated to estimate the nonlinear propagation characteristics as their magnitude ratio, w here since bispectrum is free from the gaussian additive noise we can get the value with high S/N. Basic experimental system is constructed by using 3.0 MHz probing ultrasonic waves and the several experiments are carried out for some phantoms. Results show the superiority of the proposed method to the conventional method using power spectrum and also its usefulness for the tissue characterization. 30541 T00401030541 ^x This paper describes the implementation of a computerized radial pulse diagnosis by aids of a clinical expert. On this base, we composed of the radial pulse diagnosis system in korean traditional medicine. The system composed of a radial pulse wave detection system and a radial pulse diagnosis system. With a detection system, we detected Inyoung and Cheongu radial pulse wave and processed it. Then, we have got the characteristic parameters of radial pulse wave and also quantified that according to the method of Inyoung-Cheongu Comparison Radial Pulse Diagnosis. We defined the jugement standard of radial pulse diagnosis system and then we confirmed the possibility for realization of automatic radial pulse diagnosis in korean traditional medicine. 30545 T00401030545 ^x Microspheres are expected to be applied to biomedical areas such as solid-phase immunoassays, drug delivery systems, immunomagnetic cell separation. To synthesize microspheres for biomedical application, "two stage shot growth method" was developed. The uniformity ratio of synthesized microspheres was always smaller than 1.05. And the surface charge density (or the number of ionizable functional groups) of the microspheres synthesized by "two stage shot growth method" was 6~13 times higher than that of the microspheres synthesized by conventional seeded batch copolymerization. As a previous step for biomedical application, adsorption experiments of bovine albumin on microspheres were carried out under various conditions. The maximum adsorbed amount was obtained in the neighborhood of pH 4.5. Isoelectric point of bovine albumin is pH 5.0, so experimental result shows that it shifted to acid area. The adsorption isotherm was obtained, the plateau region was always reached at 2.Og/L (bulk concentration of bovine albumin).The effect of the kind and the amount of surface functional group was also examined. 30575 T00401030575 ^x A medical image workstation was developed using multimedia technique. The system based on PC-486DX was designed to acquire medical images produced by medical imaging instruments and related audio information, that is, doctors' reporting results. Input information was processed and analyzed, then the results were presented in the form of graph and animation. All the informations of the system were hierarchically related with the image as the apex. Processing and analysis algorithms were implemented so that the diagnostic accuracy could be improved. The diagnosed information can be transferred for patient diagnosis through LAN(local area network). 30592 T00401030592 ^x In the conventional infrared imaging system, complex infrared lens systems are usually used for directing collimated narrow infrared beams into the high speed 2-dimensional optic scanner. In this paper, a simple reflective infrared optic system with a 2-dimensional optic scanner is proposed for the realization of medical infrared thermography system. It has been experimentally proven that the intfrared thermography system composed of the proposed optic system has the temperature resolution of 0.1˚c under the spatial resolution of lmrad, the image matrix size of 256 X 240, and tile imaging time of 4 seconds. 30593 T00401030593 ^x In this paper, MIIS (Medical Image Information System) has been designed and implemented using INGRES RDBMS, which is based on a client/server architecture. The implemented system allows users to register and retrieve patient information, medical images and diagnostic reports. It also provides the function to display these information on workstation windows simultaneously by using the designed menu-driven graphic user interface. The medical image compression/decompression techniques are implemented and integrated into the medical image database system for the efficient data storage and the fast access through the network. 30594 T00401030594 ^x In this paper, computerized BEAM was implemented for the space domain analysis of EEG. Trans-formation from temporal summation to two-dimensional mappings is formed by 4 nearest point inter-polaton method. Methods of representation of BEAM are two. One is dot density method which classify brain electrical potential 9 levels by dot density of gray levels and the other is colour method which classify brain electrical 12 levels by red-green colours. In this BEAM, instantaneous change and average energy distribution over any arbitrary time interval of brain electrical activity could be observed and analyzed easily. In the frequency domain, the distribution of energy spectrum of a special band can easily be distinguished normality and abnormality. 30608 T00401030608 ^x Laboratory information system (LIS) is a key tool to manage laboratory data in clinical pathology. Our department has developed an information system for routine hematology using down-sized computer system. We have used an IBM 486 compatible PC with 16MB main memory, 210 MB hard disk drive, 9 RS-232C port and 24 pin dot printer. The operating system and database management system were SCO UNIX and SCO foxbase, respectively. For program development, we used Xbase language provided by SCO foxbase. The C language was used for interface purpose. To make the system use friendly, pull-down menu was used. The system connected to our hospital information system via application program interface (API), so the information related to patient and request details is automatically transmitted to our computer. Our system interfaced with fwd complete blood count analyzers(Sysmex NE-8000 and Coulter STKS) for unidirectional data tansmission from analyzer to computer. The authors suggests that this system based on down-sized computer could provide a progressive approach to total LIS based on local area network, and the implemented system could serve as a model for other hospital's LIS for routine hematology. 30609 T00401030609 ^x To develop an artificial bone substitute that is gradually degraded and replaced by the regenerated natural bone, the authors designed a composite that is consisted of calcium phosphate and collagen. To use as the structural matrix of the composite, collagen was purified from human umbilical cord. The obtained collagen was treated by pepsin to remove telopeptides, and finally, the immune-free atelocollagen was produced: The cross linked atelocollagen was highly resistant to the collagenase induced collagenolysis. The cross linked collagen demonstrated an improved tensile strength. 30618 T00401030618 ^x This paper is a study on the design of adptive filter for QRS complex detection. We propose a simple adaptive algorithm to increase capability of noise cancelation in QRS complex detection with two stage adaptive filter. At the first stage, background noise is removed and at the next stage, only spectrum of QRS complex components is passed. Two adaptive filters can afford to keep track of the changes of both noise and QRS complex. Each adaptive filter consists of prediction error filter and FIR filter The impulse response of FIR filter uses coefficients of prediction error filter. The detection rates for 105 and 108 of MIT/BIH data base were 99.3% and 97.4% respectively. 30619 T00401030619 ^x To develop an artificial bone substitute that is gradually degraded and replaced by the regenerated natural bone, the authors designed and produced a composite that is consisted of calcium phosphate and collagen. Human umbilical cord origin pepsin treated type I atelocollagen was used as the structural matrix, by which sintered or non-sintered carbonate apatite was encapsulated to form an inorganic-organic composite. With cross linking atelocollagen by UV ray irradiation, the resistance to both compressive and tensile strength was increased. Collagen degradation by the collagenase induced collagenolysis was also decreased. 30620 T00401030620 ^x We have developed a monoleaflet polymer valve as an inexpensive and viable alternative, especially for short-term use in the ventricular assist device or total artificial heart. The frame and leaflet of the polymer valve were made from polyurethane, To evaluate the hemodynamic performance of the polymer valve a comparative study of flow dynamics past a polymer valve and a St. Jude Medical prosthetic valve under physiological pulsatile flow conditions in vitro was made. Comparisons between the valves were made on the transvalvular pressure drop, regurgitation volume and maximum valve opening area. The polymer valve showed smaller regurgitation volume and transvalvular pressure drop compared to the mechanical valve at higher heart rate. The results showed that the functional characteristics of the polymer valve compared favorably with those of the mechanical valve at higher heart rate. 30621 T00401030621 ^x Explosive evaporative removal process of biological tissue by absorption of a CW laser has been simulated by using gelatin and a multimode Nd:YAG laser. Because the point of maximun temperature of laser-irradiated gelatin exists below the surface due to surface cooling, evaporation at the boiling temperature is made explosively from below the surface. The important parameters of this process are the conduction loss to laser power absorption (defined as the conduction-to-laser power parameter, Nk), the convection heat transfer at the surface to conduction loss (defined as Bi), dimensionless extinction coefficient (defined as Br.), and dimensionless irradiation time (defined as Fo). Dependence of Fo on Nk and Bi has been observed by experiment, and the results have been compared with the numerical results obtained by solving a 2-dimensional conduction equation. Fo and explosion depth (from the surface to the point of maximun temperature) are increased when Nk and Bi are increased.To find out the minimum laser power for explosive evaporative removal process, steady state analysis has been also made. The limit of Nk to induce evaporative removal, which is proportional to the inverse of the laser power, has been obtained. 30622 T00401030622 ^x N1 and N2 gross neural action potentials were measured from the round window of the guinea pig cochlea at the onset of the acoustic stimuli. N1-N2 audiograms were made by means of regulating stimulant intensities in order to produce constant N1-N2 potentials as criteria for different input tone pip frequencies. The lowest threshold was measured with an input tone pip I5 dB SPL in intensity and 12 KHz in frequency when the animal was in normal physiological condition. The procedure of experimental measurements is explained in detail. This experimental approach is very useful for the investigation of the Cochlear function. Both noN1inear and active functions of the Cochlea can be monitored by N1-N2 audiograms. 30623 T00401030623 ^x In electrical impedance tomography(EIT), we use boundary current and voltage measurements toprovide the information about the cross-sectional distribution of electrical impedance or resistivity. One of the major problems in EIT has been the inaccessibility of internal voltage or current data in finding the internal impedance values. We propose a new image reconstruction method using internal current density data measured by NMR. We obtained a two-dimensional current density distribution within a phantom by processing the real and imaginary MR images from a 4.77 NMR machine. We implemented a resistivity mage reconstruction algorithm using the finite element method and sensitivity matrix. We presented computer simulation results of the mage reconstruction algorithm and furture direction of the research. 30624 T00401030624 ^x A new method of digital image analysis technique for discrimination of cancer cell was presented in this paper. The object image was the Thyroid eland cells image that was diagnosed as normal and abnormal (two types of abnormal: follicular neoplastic cell, and papillary neoplastic cell), respectively. By using the proposed region segmentation algorithm, the cells were segmented into nucleus. The 16 feature parameters were used to calculate the features of each nucleus. A9 a consequence of using dominant feature parameters method proposed in this paper, discrimination rate of 91.11% was obtained for Thyroid Gland cells. 30625 T00401030625 ^x An electrical stimulator was designed to induce locomotion for paraplegic patients caused by central nervous system injury. Optimal stimulus parameters, which can minimize muscle fatigue and can achieve effective muscle contraction were determined in slow and fast muscles in Sprague-Dawley rats. Stimulus patterns of our stimulator were designed to simulate electromyographic activity monitored during locomotion of normal subjects. Muscle types of the lower extremity were classified according to their mechanical property of contraction, which are slow muscle (msoleus m.) and fast muscle (medial gastrocneminus m., rectus femoris m., vastus lateralis m.). Optimal parameters of electrical stimulation for slow muscles were 20 Hz, 0.2 ms square pulse. For fast muscle, 40 Hz, 0.3 ms square pulse was optimal to produce repeated contraction. Higher stimulus intensity was required when synergistic muscles were stimulated simultaneously than when they were stimulated individually. Electrical stimulation for each muscle was designed to generate bipedal locomotion, so that individual muscles alternate contraction and relaxation to simulate stance and swing phases. Portable electrical stimulator with 16 channels built in microprocessor was constructed and applied to paraplegic patients due to lumbar cord injury. The electrical stimulator restored partially gait function in paraplegic patients. 30626 T00401030626 ^x Two-Dimensional modelling of the Cochlear biomechanics is presented in this paper. The Laplace partial differential equation which represents the fluid mechanics of the Cochlea has been transformed into two-dimensional electrical transmission line. The procedure of this transformation is explained in detail. The comparison between one and two dimensional models is also presented. This electrical modelling of the basilar membrane (BM) is clearly useful for the next approach to the further. Development of active elements which are essential in the producing of the sharp tuning of the BM. This paper shows that two-dimension model is qualitatively better than one-dimensional model both in amplitude and phase responses of the BM displacement. The present model is only for frequency response. However because the model is electrical, the two-dimensional transmission line model can be extended to time response without any difficult. 30627 T00401030627 ^x A method has been proposed for the fully automatic detection of left ventricular endocardial boundary in 2D short axis echocardiogram using geometric model. The procedure has the following three distinct stages. First, the initial center is estimated by the initial center estimation algorithm which is applied to decimated image. Second, the center estimation algorithm is applied to original image and then best-fit elliptic model estimation is processed. Third, best-fit boundary is detected by the cost function which is based on the best-fit elliptic model. The proposed method shows effective result without manual intervention by a human operator. 30628 T00401030628 ^x The intelligent trajectory control method that controls moving direction and average velocity for a prosthetic arm is proposed by pattern recognition and force estimations using EMG signals. Also, we propose the real time trajectory planning method which generates continuous accelleration paths using 3 stage linear filters to minimize the impact to human body induced by arm motions and to reduce the muscle fatigue. We use combination of MLP and fuzzy filter for pattern recognition to estimate the direction of a muscle and Hogan's method for the force estimation. EMG signals are acquired by using a amputation simulator and 2 dimensional joystick motion. The simulation results of proposed prosthetic arm control system using the EMf signals show that the arm is effectively followed the desired trajectory depended on estimated force and direction of muscle movements. 30638 T00401030638 ^x A new neural network architecture for the recognition of patterns from images is proposed, which is partially based on the results of physiological studies. The proposed network is composed of multi-layers and the nerve cells in each layer are connected by spatial filters which approximate receptive fields in optic nerve fields. In the proposed method, patterns recognition for complicated images is carried out using global features as well as local features such as lines and end-points. A new generating method of matched filers representing global features is proposed in this network. 30659 T00401030659 ^x An implementation scheme of the magnetic nerve stimulator using a switching mode power supply is proposed. By using a switching mode power supply rather than a conventional linear power supply for charging high voltage capacitors, the weight and size of the magnetic nerve stimulator can be considerably reduced. Maximum output voltage of the developed magnetic nerve stimulator using the switching mode power supply is 3,000 volts and switching time is about 100 msec. Experimental results or human nerve stimulations using the developed stimulator are presented. 30768 T00401030768 ^x In this paper, we describe the design methodology and specifications of the developed module-based bedside monitors for patient monitoring. The bedside monitor consists of a main unit and module cases with various parameter modules. The main unit includes a 12.1" TFT color LCD, a main CPU board, and peripherals such as a module controller, Ethernet LAN card, video card, rotate/push button controller, etc. The main unit can connect at maximum three module cases each of which can accommodate up to 7 parameter modules. They include the modules for electrocardiograph, respiration, invasive blood pressure, noninvasive blood pressure, temperature, and SpO2 with Plethysmograph.