• 한국조경학회지
• /
• 제46권3호
• /
• pp.58-69
• /
• 2018

가로수 뿌리융기발생의 빈도가 높은 대전시 서구 내 둔산동택지개발 가로수를 대상으로 뿌리 융기상태와 가로시설 현황조사를 통해 가로수와 가로시설간의 융기특성과 이들 간의 상관관계를 밝히고자 한다. 연구 대상지는 대전광역시 서구를 중심으로 6곳의 메타세쿼이아와 양버즘나무로 선정 조사하였으며, 가로수 뿌리 융기 발생 시 가로수 보호틀 파손율(95.3%)이 차도경계석파손율(19.7%)보다 높았다. 또한, 보호덮개가 없는 가로수는 포장면 융기현상 발생 확률이 높으며, 식수대면적이 일정 이상 높아지면 보호틀 파손빈도가 낮아지는 것을 알 수 있었다. 융기형태의 빈도는 꼬리형>마운딩형>불규칙형 순이며, 융기방향의 빈도는 차도경계석과 평행을 기준으로 차량진행방향이 $180^{\circ}$ 보도 쪽이 $90^{\circ}$로 기준하였을 때 1방향($0{\sim}44^{\circ}$), 2방향($45{\sim}89^{\circ}$), 3방향($90{\sim}134^{\circ}$)에서 가장 많은 포장면 융기발생이 일어났다. 또한 융기길이는 약 31~60cm에서 융기발생이 가장 많이 발생하며, 융기높이는 3~6cm에서 발생빈도가 가장 높다. 융기 변형량 결과를 비교해보면 조사 수종이 주수가 메타세쿼이아가 양버즘나무보다 2주 적음에도 불구하고 양버즘나무의 변형량보다 약 1.3배 정도 높게 나타났는데, 이것은 메타세쿼이아가 양버즘나무보다 포장면 융기로 인한 변형량이 높다는 것을 알 수 있다. 또한 융기길이, 융기너비, 융기높이가 클수록 변형량이 높아지는 것을 알 수 있으며, 흉고직경, 보도 폭의 규격, 융기현상의 빈도와 변형량의 관계는 꼭 비례하지 않으며, 토양습도와 식재 기반 등 외부적인 요소로 인해 차이가 있다고 판단되어 융기현상을 저감하기 위한 방법으로 다방향의 개선방안 접근이 필요하다.

• 한국조경학회지
• /
• 제45권3호
• /
• pp.66-79
• /
• 2017

기념성을 구현하기 위한 형태와 기법들이 다양하게 나타나는 가운데 지난 2014년 동학농민혁명 기념공원 설계 공모가 진행되었다. 이는 집단의 기억을 강요하던 기념(記念) 사업에 대한 재고의 과정이며, 현재 우리나라에서 계획하고 있는 메모리얼 설계에 대한 동시대 설계가들의 인식을 고찰할 수 있는 의미 있는 소재이다. 본 연구는 동일한 대상지에서 이뤄졌던 동학기념사업들에 대해 시계열적으로 그 형성 배경을 살펴보고, 기존의 문헌 연구 등을 통해 설계공모를 분석하는 과정을 거쳤다. 이를 통해, 과거 정치적 목적의 수단으로써 조성되던 기념물이 공개공모를 통해 다양한 의견 수렴과 형태를 모색하는 방향으로 변하였음을 알 수 있었다. 다층적 분석을 통해 마련된 분석의 틀은 일상성, 상호작용 및 자발성, 추상성, 임시성, 장소성, 통합성 그리고 조화성이다. 이를 통해 본 결과는 다음과 같다. 첫째, 일상 속에서 기념성을 전달하기 위해 기존의 특수성을 갖는 산재한 기념공간들을 일상적 활동 프로그램과 연계하였다. 둘째, 기념물과의 상호작용을 위하여 직접적인 참여와 감성적인 체험 방법을 사용하였다. 셋째, 추상적 재현을 위해 색상, 수직요소, 군집화, 공원의 틀 조작 등의 기법을 사용하였다. 넷째, 임시성과 변화성을 추구하기 위하여 식물을 이용한 애도의 방식과 물리적 변화가 가능한 건축물과 구조물들을 도입하였다. 다섯째, 대상지를 장소성이 있는 공간으로 만들기 위하여 과거 지형을 복원하고, 현장의 모습을 재현하였다. 여섯째, 기존 기념물들과의 연계성을 증진시키기 위하여 순환동선과 축선 조작 기법을 사용하였다. 일곱째, 주변과의 조화를 위하여 지형에 순응하는 동선과 건물을 배치하였다.

• 헤리티지:역사와 과학
• /
• 제46권2호
• /
• pp.4-25
• /
• 2013

고리수는 편결(編結)과 금속공예의 기술이 접목된 새로운 형식의 수법(繡法)이다. 실올끼리 고리를 서로 엮어가며 공간상(空間上)에서 들떠 있어 마치 투조(透彫)와 같은 느낌을 준다. 수놓은 천에는 금박(金箔)이나 금실과 같은 황금 재질을 삽입하여 화려한 광택을 표현하고 있다. 이러한 특징은 고리수가 서구의 레이스워크(lacework) 공예와 그 형태 및 기법이 유사하면서도 가장 다른 점이다. 10세기 고려 초기, 강원도 월정사의 동자문수향갑낭(童子紋繡香匣囊)에서 고리수의 결구원(結構元) 무늬를 통해 초창기 자취를 발견할 수 있다. 조선 중기 왜란 시(1592, 선조 25년), 고리수 유물은 일본으로 약탈되어 '고려번(高麗幡)'이라고 불리며, 지금은 탁의(卓衣)의 형태로 개조되어 전한다. 19세기의 연대와 출처가 확실한 조선시대 궁수(宮繡) 베갯모에는 삼각무늬의 금박지(金箔紙)를 삽입하여 노란색 누에실을 엮어 짠 고리 감기수가 완벽하게 보존되어 있다. 고리수의 침법(針法)을 크게 분류하면, '고리수', '고리 감기수', '고리 새김수'의 3가지로 나눌 수 있다. 10세기경 초기 단계에서 13세기까지 고리수는 여러 침법으로 변화하며 점차 2~3가지의 입체적인 색채를 사용하였다. 고리수는 중세 이후 서양에서 비약적 발전을 보이며 고귀한 수공예로 알려진 레이스 짜기와 유사한 결구원을 지녔는데, 우리나라에서는 이미 10세기경 혹은 그 이전부터 편결과 금속공예가 접목된 복합적 공예 양식으로 탄생하여 천년 동안이나 그 수법(繡法)을 지속적으로 사용했다. 본 연구를 통해 한국에서 19세기 자수 베갯모에 고리수가 여전히 사용되고 있음을 밝혔다. 아울러 이러한 연구의 성과를 토대로 고리수의 원형기술을 복원했다. 그리고 '중요무형문화재 제80호' 기능보유자 한상수 자수장과 조선시대 고리수 유물들을 재현했다. 고리수 자수품은 편결과 금속공예의 황금세공기술이 자수공예와 접목하여 탄생된 전통과학기술의 복합적 산물(産物)이다. 이것을 계승과 창조의 새로운 방향으로 자수, 편결, 직조, 염색 등 기타 공예 관련 산업 분야에 확대 응용한다면, 의료(衣料)와 패션, 장식공예, 미술 디자인 등에 고급 부가가치의 신기술로 개발되어 활용될 수 있다. 또한 다른 공예기술과도 상호 보완된다면, 표현 영역의 확대와 더불어 다양한 예술적 조형미를 추구할 수 있어 우리의 삶에서 더욱 풍부한 미적 생활을 공유하게 되리라고 본다.

• 한국조경학회지
• /
• 제51권4호
• /
• pp.56-75
• /
• 2023

신안군 반월·박지도는 2019년도 '가고싶은 섬' 사업의 일환으로 지붕과 건축물, 시설물 등을 보라색으로 칠한 컬러마케팅을 시작했다. 이러한 경관 변화가 '위험하지만 아름다운 시도'로 평가되면서 2021년 '세계 최우수 관광마을(Best Tourism Village)'로 선정되어 국내외 관광객들의 관심을 한 몸에 받았다. 그러나 실질적 경관 조성의 주체이자 향유자인 반월·박지도 주민은 경관 계획 및 사업 추진 단계의 변두리에 위치한다. 본 연구는 이러한 배경에서 새로운 경관이 지니는 의미와 기호를 실존적 내부자인 주민을 통해 읽어내었다. 경관에 담긴 상징적 의미와 기호화된 이데올로기를 해석했던 신문화지리학의 문화경관 틀을 활용하였으며, 내부자로서의 다층적 환경인식을 파악하기 위해 총체적 접근을 시도했다. 이로써 섬의 주요 색상인 보라색에 대한 인식, 전체적인 경관과 개별 공간들에 대한 인식, 퍼플섬 사업에 대한 전반적인 인식 변화를 분석했다. 퍼플섬 사업 이후 마을을 인지하는 주요 감각이 시각 중심으로 재편되는 양상을 보였고, 낙후된 마을 환경을 개선할 수 있게 해준 보라색 경관에 만족하고 있었다. 색에 대한 가치판단보다는 부속섬으로서 오랜 시간 경험했던 부정적인 기억이 판단의 근거가 된 것이다. 또한 장소에 대한 인식이 사회적이고 보편적 체계를 지닌 상징적 경관(langue)이 관광 기능을 포함하여 세분화 및 재편되었다. 이는 코스모폴리터니즘(cosmopolitanism) 속에서 등장한 스펙터클 경관의 양상이라고 이해할 수 있다. 그러나 관광지로 변모하는 과정에서 지역 자원의 가치를 새롭게 인식하고 참여를 통해 새로운 문화경관을 만들어가는 모습 또한 발견되었다. 더불어 반월·박지도 사이의 관계 인식이 관광 기능을 중심으로 변화되었다.

• Journal of Preventive Medicine and Public Health
• /
• 제30권4호
• /
• pp.669-685
• /
• 1997

백인여성들을 대상으로 골관절염과 골다공증 발생사이에 역상관 현상이 존재함을 관찰하고 보고한 기존의 연구결과를 통해 두 질환간 관련성이 존재하지 않나 추측해 볼 수 있다. 본 연구에서는 우리나라에서도 이런 관련성이 존재하는지를 파악하기 위해, "골관절염에 이환된 여성의 골밀도가 이환되지 않은 여성의 골밀도에 비해 유의하게 높을 것"이란 가설을 세우고 구리시민을 대상으로 실시된 건강 영양진단 조사 자료를 분석함으로써 이를 검증하고자 하였다. 대상 표본인구는 미리 설정된 조사구를 이용한 다단계 표본추출법을 이용하여 선정하였다. 1997년 8윌 18일부터 9월 10일까지의 조사기간 동안, 총 1,656명의 대상자가 선정되었으며 이중 867명이 조사에 응하여 수진율은 52.4%였다. 이 중 여성의 수는 519명이었다. 519명의 여성중 골밀도 측정, 방사선촬영, 신체계측을 모두 시행받은 420명을 대상으로 분석을 진행하였다. 그 결과는 다음과 같다. 1. 대상자의 일반적 특성 분석 결과: 평균 골밀도는 $0.493g/cm^2$, 평균 연령은 43.0세, 평균 신체비만지수는 $23.9kg/m^2$였다. 폐경을 맞이한 사람의 수는 106명, 자궁적출술을 시행받은 사람의 수는 19명이었다. 골관절염을 진단할 수 있었던 경우는 고관절염 0례, 슬관절염 64례, 손관절염 2례가 있었다. 2. 단변량 분석 결과: 슬관절염 이환 여부에 따른 평균 골밀도 비교 결과, 비이환군에 비해 이환군의 평균골밀도가 유의하게 낮았다(0.4269 대 $0.5057g/cm^2$). 그러나, 고관절염 및 손관절염 이환자는 수가 적어 이환여부에 따른 골밀도 비교분석을 실시하지 못했다. 폐경 여부에 따른 평균 골밀도 비교 결과, 폐경전군과 폐경군, 자궁적출군 사이에 평균 골밀도의 유의한 차이가 있었다(0.5204대 0.4206대 $0.4881g/cm^2$). 또한, 당뇨 이환 여부에 따른 평균 골밀도 비교 결과, 당뇨군과 내당력부전군, 정상군 사이에 평균 골밀도의 유의한 차이가 있었다(0.4297대 0.4874대 $0.5057g/cm^2$). 이외에 연령, 총임신회수, 신체비만지수, 체지방이 골밀도에 대해 유의한 음의 상관관계가 있었다. 3. 다변량 분석 결과: 다른 변수의 영향을 통제한 상태에서 골관절염과 골밀도간의 관련성을 밝히기 위해 단변량 분석에서 골밀도와 유의한 관련성이 있었던 변수들을 포함한 다중회귀분석 방정식을 만들어 검정하였다. 그 결과, 슬관절염 이환 여부는 골밀도에 대해 유의한 관련성을 보이지 않았다. 그러나, 연령과 폐경은 골밀도에 대해 유의한 음의 관련성이 있었다. 당뇨, 총임신회수, 신체비만지수, 체지방은 골밀도에 대해 유의한 관련성이 없었다. 대상자를 폐경 여부에 따라 층화하여 다중회귀분석을 시행한 결과, 폐경군에서는 연령이, 자궁적출군에서는 연령 및 슬관절염 이환이 골밀도에 대해 유의한 음의 관련성이 있었다. 이상의 연구 결과는 백인을 대상으로 시행한 기존의 다수 연구 결과들을 지지하는 내용이 아니다. 우리나라 여성에서 왜 이런 결과가 발생하였는지를 설명할 수 있는 생물학적 개연성에 대한 연구가 필요하다. 또한, 앞으로 단면조사연구가 아닌 시계열적인 연구를 통해 본 연구 결과를 다시 검증하는 것이 바람직할 것이다.

• 마케팅과학연구
• /
• 제17권2호
• /
• pp.31-54
• /
• 2007

첨단산업의 기업들은 환경의 변화에 효과적으로 대응하는 것을 기업 성패에 중요한 요인으로 여기고 있다. 하지만 첨단산업의 환경 동태성이 공급체인 구성원 간 관계 결속에 미치는 영향에 관한 연구가 부족하여, 환경 변화에 효과적인 대응을 어렵게 하고 있다. 본 연구는 첨단산업에서 환경 동태성이 공급체인의 결속에 영향을 미치는 메커니즘에 대해 규명하고 있다. 좀 더 구체적으로 말하면, 첫째, 첨단산업의 고객, 경쟁, 기술 동태성이 공급체인의 결속에 어떠한 영향을 미치는지, 둘째, 공급체인의 유연성과 의존성이 이러한 영향에 어떠한 조절효과를 가지는 지 실증하고 있다. 구조방정식 모형에 의한 가설검정 결과 첨단산업의 고객 동태성은 공급체인의 결속을 약화시켰지만 경쟁 동태성은 강화시키는 역할을 하였다. 한편 유연성과 의존성은 고객과 경쟁 동태성에 유의적인 조절 효과를 가졌다.

• 한국철학논집
• /
• 제32호
• /
• pp.215-249
• /
• 2011

본고는 서양 근대 문명 수용 초기(1890~1910)에 발생한 신구 관념의 대립과 충돌을 중심으로 전통 지식 체계의 변용을 역사의미론적으로 탐색함으로써 한국의 근대를 성찰하는 데 목적이 있다. 한국에서 신구 관념을 놓고 벌어진 주체 간의 투쟁은 전통개신론자들과 문명개화론자들의 주장에서 첨예하게 드러났다. 서양의 충격에서 비롯된 신구 관념의 대립과 충돌은 우주 자연으로부터 사회 정치체제, 학술?문화 등 모든 부문에서 인식의 전환을 요구하였지만, 전통 지식 체계를 이해하는 시각에는 다소 차이가 있었다. 신구 관념에 따른 전통 지식 체계의 구축과 변용과정에서 문명개화론자들에게 '구(舊)'는 단순히 과거의 '지나간', '오래된' 것이 아니라 파괴하고 제거하지 않으면 새로운 문명 건설을 방해하는 장애물이었다. 그러나 전통개신론자들에게 '구(舊)'는 '온고지신(溫故知新)'의 이념 속에서 다시 '신(新)'으로 거듭날 수 있는 가능성을 내함하고 있는 '개신(改新)'의 대상이었다. 박은식의 "유교구신론(儒敎求新論)"이나 한용운의 "조선불교유신론(朝鮮佛敎維新論)"은 전통 지식 체계를 '신학(新學)'으로 재편하려한 대표적인 시도였다. 보편성과 객관성, 합리성을 추구하는 과학적 방법을 수용함으로써 전통 지식 체계는 근대적인 학문으로 변화할 수 있었다. 그러나 신학(新學)으로 변화하는 과정에서 성학(聖學)으로서의 위상은 탈각되었고, 신앙과 종교적 전통 또한 약화될 수밖에 없었다. 이러한 전통 지식 체계의 변용과 '구학의 신학화' 과정에서 신구 관념의 교차가 발생하였다. 여기서 특히 신구 관념의 교차를 가능하게 한 '실(實)(학(學))' 개념에 주목할 필요가 있다. 20세기 전후 발간된 다종의 근대 매체는 신구 관념의 다층적 전개 양상을 여실히 보여주는데, 전통 지식 체계가 신학(新學)으로 변용될 수 있었던 계기로서 '실학'이라는 개념적 준거틀이 작동하였음을 확인할 수 있다. 물론 이 시기 실학이 지칭하는 대상은 대체로 서양의 학문인 '신학(新學)'을 표상하고 심지어 등치되기도 했지만, 전통개신론자들은 문명개화론자들이 점유하였던 '실학' 개념과 그 의미를 재해석함으로써 전통 지식 체계를 신학으로 바꿀 수 있었다. 이들은 과학 기술에 압도되어 점차로 거세되어가던 전통적 가치를 '신학' 수용의 토대로 인식하고, '실학(實學)'을 개념을 준거로 하여 '신학(新學)'을 재전유(再專有)(re-appropriation)하였다. 일제의 강점이 구체화 되어 전통 지식 체계의 주체적 변용 시도는 일정한 한계에 직면할 수밖에 없었지만 '구학의 신학화'는 '동도서기(東道西器)' 논리가 지닌 모순과 문명개화론의 탈주체성을 넘어서는 것으로 평가할 수 있다. 도덕 원리와 경쟁 원리가 충돌하고 '진화'와 '진보'가 대세인 현실에 대응하려했던 '동도서기(東道西器)' 논리는 이미 분리될 수 없는 도(道)와 기(器)를 분리 가능한 것으로 상정해야만 성립되는 모순을 안고 있었고, 문명개화론은 서양을 내면화하여 자기 비하와 멸시로 주체의 균열을 야기하고 전통 지식 체계로부터 단절됐다는 비판에서 자유로울 수 없기 때문이다.

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