• 공연문화연구
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• 제43호
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• pp.47-78
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• 2021

본 연구는 판소리를 소재로 한 영화를 대상으로 영화 속에서 판소리가 수용된 양상을 살핌으로써, 판소리에 대한 현대사회의 인식과 기대의 변화를 탐색하는 것을 목적으로 한다. 조선후기 상하층의 사랑을 두루 받았던 판소리는 일제 강점기와 한국 전쟁을 겪으며 그 위상이 꺾이게 된다. 일본에서 유입된 신문물의 영향과 미국 문화의 유입으로 대중적 관심을 잃게 되며, 고루하고 낡은 전통의 이미지를 갖게 되었다. 이에 국가는 점차 사라지는 판소리를 보호 및 계승하기 위해 1964년 판소리를 중요무형문화재로 지정하지만 1980년대까지도 판소리의 자생적 대중성 확보는 어려웠다. 그러나 판소리는 국가의 꾸준한 지원과 명창들의 판소리 전승 노력, 그리고 2000년대 들어 우리의 것을 세계화하자는 사회문화적 담론 속에서 점차 동시대의 대중과 호흡하는 노력을 해왔고, 문화콘텐츠의 주요 소재로도 각광을 받게 되었다. 그리고 지금은 팝밴드 '이날치'와 현대무용그룹 '앰비규어스 댄스 컴퍼니'가 선보인 뮤직비디오 형식의 'Feel the Rhythm of KOREA'가 보여주듯 현재의 주목받은 대중문화 가운데 하나가 되었다. 현대사회 속에서 점차 변화해가는 판소리에 대한 대중적 인식과 판소리의 위상은 영화라는 대중매체 속에서도 엿볼 수 있다. 본 연구는 1993년 임권택 감독의 <서편제>를 비롯하여 최근의 <소리꾼>까지 판소리를 소재로 한 6편의 영화를 선별하여 이와 같은 변화의 추이를 탐색하였다. 먼저 1990년대에 제작된 영화 <서편제>와 <휘모리>이다. 이 두 편의 영화는 모두 당대에서 그리 멀지 않은 시대의 판소리, 즉 20세기 초중반 전승의 위기와 대중적 관심에서 멀어진 판소리의 현실을 보여주며, 그 속에서도 판소리 자체의 예술적 완성을 위해 치열하게 분투하는 소리꾼의 모습을 영화에 담아내었다. 판소리가 가진 정서로써 '한'과 북과 소리의 조화를 통한 판소리 미학을 강조함으로써 우리 소리의 숭고함과 특수함을 대중에게 선보였다. 판소리에 관해 관심이 적었고, 따라서 이의 가치를 잘 모르던 대중은 즉각 이에 화답하며 우리 음악과 우리의 정서에 대한 폭발적 지지를 보여 이른바 '<서편제> 신드롬'을 불러일으키기도 하였다. <서편제>와 <휘모리>는 우리 소리에 대한 관심과 지식이 부족한 시기, 그러나 그 필요성이 지속적으로 요청되던 1990년대라는 시대적 상황이 영화의 내용과 구성에 반영되며 당대 판소리에 대한 사회적 인식과 기대를 드러내었다. 다음으로 2008년에 제작된 영화 <소리, 아이>와 2012년의 <두레소리>이다. 두 영화는 판소리와 국악을 하는 동시대의 어린이, 학생을 주인공으로 하여 예술을 하는 아이들의 성장기를 그려나가는 데 초점을 맞췄다. 이들 영화에서 판소리는 '요즘 세상에 누가 그것을 하냐'의 소리를 듣는 옛 음악도 아니고, 혹독한 수련과 고통 속에서 완성이 되는 숭고한 음악으로 묘사되지도 않는다. 부모님의 권유, 집안의 사정 속에서 판소리를 시작한 아이들이 소리를 익히고 성장하고, 갈등하고, 고민하는 이야기를 통해 판소리는 동시대의 하나의 자연스러운 예술로 그려질 뿐이다. 판소리를 비롯한 국악의 정통성을 신념화하여 강조하지 않고, 교조적으로 이를 대중에게 전달하지 않는다. 이는 동시대의 예술로 판소리를 바라보는 2000년대의 달라진 대중적 인식을 반영하는 속에서 판소리가 해석된 것이라 볼 수 있다. 마지막으로 2015년의 <도리화가>와 최근 상영된 2020년의 <소리꾼>이다. 흥미롭게도 두 작품 모두 판소리가 민중의 사랑을 가장 많이 받던 조선후기를 영화의 시간적 배경으로 삼고 있다. 영화의 이야기를 판소리의 역사를 토대로 구성하였는데, <도리화가>의 경우는 실존 인물인 신재효와 진채선을 바탕으로 영화적 상상력을 덧붙인 서사를 전개하였다. 그리고 <소리꾼>의 경우는 광대의 소리가 판소리 사설의 원류가 되었다는 판소리 이론과 판소리 <심청가>의 서사를 활용하여 당대 존재했을 법한 소리꾼의 삶의 이야기를 그려냈다. 두 영화는 판소리의 역사에서 이야기의 소재를 찾아 이를 영화화하였다고 할 수 있는데, 이는 전통을 문화콘텐츠의 소재로 삼고자 하는 시대적 분위기와 연결된다. 정보통신 기술의 발달로 국가 간의 문화장벽이 허물어지고 있는 때에, 콘텐츠의 소재는 더욱 다양해지고 있다. 역사를 활용한 이야기가 그간 없었던 것은 아니지만, 전통의 문화를 적극적으로 문화콘텐츠의 소재로 삼고자 하는 시도는 2000년대 들어 본격화되었고, 판소리의 음악뿐만 아니라, 판소리의 역사 또한 활용 가능한 콘텐츠의 대상이 되었다. 지금의 판소리는 향수를 불러일으키는 옛것도, 낡은 전통도 아닌 동시대와 끊임없이 소통하는 예술이자, 다양한 콘텐츠의 소재로 활용 가능한 자리에 온 것이다. 상기 영화들은 현대 판소리가 걸어온 길과 변모하는 위상, 그리고 이에 따라 달라지는 대중적 인식을 보여주고 있다는 점에서 판소리 문화의 흐름을 이해하는 기초가 될 수 있다.

• 공연문화연구
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• 제38호
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• pp.349-383
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• 2019

이 글에서 주목하는 것은 동해안별신굿에서 무당과 마을 사람들이 직접 관계 하면서 생성되는 '축원-굿춤'판이다. 굿판의 흥을 돋우기 위해 굿거리의 말미 또는 굿거리와 굿거리 사이에 집단적으로 벌이는 '허튼춤판'과는 달리, '축원-굿춤'은 매 굿거리에서 축원무가 구연 중에 개별적이고 반복적으로 생성되므로 별신굿을 이해하는 데 매우 중요한 춤이다. 그러므로 '축원-굿춤'판의 생성배경을 살피고, 그것이 어떠한 사회적 성격을 지니는지에 대해 살펴 볼 필요가 있겠다. 산업혁명 이후 기계제공업(機械制工業)이 확립되면서 많은 수공업 생산자들이 소비자의 입장으로 바뀌게 되었으며, 자본주의적 생산양식과 분배법칙은 다양한 마을굿에도 영향을 미치게 되었다. 즉 굿에 필요한 제반시설과 도구 그리고 행위 등이 자본주의적 생산과 소비 체제 속에 편입된 것이다. 이로 인해 전통적으로 굿에서 '정성'을 상징했던 시간과 행위 그리고 제물 등이 지닌 의미는 기계의 대량생산화와 자본의 흐름 속에 희석되었다. 그리고 별신 굿 기간 동안 행해지는 모든 가무악 연행은 자본/노동적 가치로 산출될 수있는데, 특히 '축원'이 '춤'으로 이어질 경우, 무당은 자본적 이익[별비]과 노동의 가치를 획득하게 된다. 그러므로 넓은 의미에서 '재수굿'에 해당되는 '축원-굿춤'판에 포함된 '축원[말]과 춤[몸짓]'의 생산 활동은 동해안별신굿이 갖는 전통적인 제의적 맥락과 더불어 한국 자본주의의 문화적 맥락 속에 놓여있다고 할 수 있겠다. '축원-굿춤'의 특징을 요약하면 다음과 같다. 첫째, '축원-굿춤'은 '마을공동체→소집단별 경쟁→개별적 경쟁'으로 이어진다. 둘째, '축원 무가' 구연이 지속적으로 반복될수록 이와 관련된 연행이 '굿춤'으로 이어질 가능성은 점점 줄어들게 된다. 셋째, 다양한 축원의 대상들 중에서 특히 어촌 사람들의 생업 활동과 관련된 직간접적인 공감대가 형성되었을 경우 '축원→굿춤'으로 잘 연결된다. 넷째, 축원의 범주에 포함되지 못한 집단은 반복적으로 '축원-굿춤'판에서 소외될 수 있다.

• 심성연구
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• 제37권2호
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• pp.184-254
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• 2022

본 논문을 통해 한국 민담 '주인집을 망하게 한 하인'의 심리학적 의미를 고찰하였다. 민담 속 주인과 하인의 대립은 보편적인 인간 정신의 문제로, 경화된 기존의 집단적 의식과 이를 보상하고 갱신하려는 새로운 의식의 대립으로 볼 수 있다. 다른 각도에서 설명해보자면 인간의 정신적인 측면과 본능적인 측면 사이의 혹은 의식과 무의식 사이의 대립이며, 자아와 그림자 사이의 대립이라고도 할 수 있다. 민담 속 주인은 애먹이는 막내 하인을 없애버리려 여러 차례 시도하지만, 하인은 꾀와 속임수를 써서 주인으로부터 음식과 말(馬), 막내 누이, 전 재산, 마침내 목숨까지 빼앗아 버리고, 이야기는 막내 하인과 막내 누이의 혼인 생활로 끝을 맺는다. 주인이 죽고 하인이 새로운 주인이 되는 대극반전(enantiodromia)은 낡은 집단적 의식이 파괴되고 집단적 무의식으로부터 올라온 새로운 의식이 지배적 위치에 서게 되는 것으로, 개인의 심리적 상황에서는 기존의 자아의 태도가 해소되고 새로운 태도로 변환되는 것으로 이해해볼 수 있다. 이야기의 중간 과정에서 하인은 그를 죽이려고 주인이 써준 등편지를 순박한 사람들을 이용해 새롭게 바꿔 써서 막내 누이와 혼인한다. 이 모습은 집단적 의식의 도덕관념에서는 부정적으로 이해될 수 있으나, 아낙네, 꿀장수, 배고픈 중으로 상징되는 조선 시대 집단적 의식에서 무시되어오던 정신요소를 통합하는 과정으로 볼 수 있다. 하인으로 대변되는 새로운 의식성은 기존의 틀에 구속받지 않는 트릭스터적 특성을 갖기에 집단적 의식에서 무시되어온 정신적 내용을 통합하여 조선 후기 집단적 의식에 대한 보상과 대안으로서 제시하는 요소라고 할 수 있다. 주인은 다시 하인을 죽이려고 하인을 가죽 부대에 넣어 나무에 매다는데, 가죽 부대 속에 들어가 매달렸더니 눈을 떴다는 하인의 속임수에 넘어간 소경이 대신 매달려 죽고 하인은 달아나게 된다. 주인과 하인의 대극 문제가 마침내 나무로 상징되는 전체 정신(Self)에 맡겨지자 소경이 제거되는 것은 트릭스터에 포함되어있는 맹목성, 어리석음, 탐욕적 요소를 구분하고 정화하려는 자기(Self)의 의도로 이해해볼 수 있다. 이런 과정들을 거쳐 집단적 의식의 새로운 변화 혹은 새로운 자아의 태도를 상징하는 하인은 기존의 문제들을 해결하고 주인의 자리에 서게 된다. 그러나 꾀 많은 하인의 활약상을 들으며 청중들은 유쾌함과 해방감을 느끼는 한편, 소경이 대신 죽고 주인집 식구가 몰살되고 하인이 주인이 되는 부분에서는 하인의 위험성과 통제 불가능에 대한 우려와 두려움의 감정을 경험하기도 한다. 해외 유화들에 등장하는 트릭스터들 역시 철저히 이기적이고 오직 욕구를 채우고 위험에서 빠져나가기 위해 무고한 존재들을 속이거나 죽게 만드는데, 이들 트릭스터를 처단하거나 교화하려는 노력은 허사로 돌아가고 그들은 달아나버린다. 그러므로 본 민담 역시 이런 원형적 그림자가 매우 위험하다는 것, 그리고 의식이 통제하거나 의식에 동화될 수 없다는 것을 알게 해주고, 그것을 외경하고 관조하도록 하는 목적 의미도 있다고 볼 수 있다. 트릭스터는 기존의 구조와 질서가 경화되었을 때 보상작용으로서 무의식으로부터 올라오는 재생시키는(revivifying) 자연 에너지의 비합리적 발현 양상이다. 그 현상은 기존의 집단적 정신의 입장에서는 파괴적이고 비도덕적일 수 있으나, 도덕적으로 규정할 수 없는 보다 근원적 정신인 집단적 무의식의 기능이라고 보아야 한다. 트릭스터 원형상으로 볼 수 있는 하인은 변환을 가져오는 존재로 파괴성과 창조성이라는 양면성과 모순성을 지니고 있다. 본 민담의 유화들의 결말은 여러 갈래인데 이는 트릭스터의 양면성으로 인해 청중의 마음 반응이 그만큼 다양하다는 것을 반영하며, 트릭스터 문제에 대한 무의식의 다양한 반응을 제시하는 것이기도 하다. 또한 트릭스터란 그만큼 결론이 안 나고 논란을 일으키는 모순덩어리 존재로 의식적 합리적 태도로 통제할 수 없다는 것, 우리 안의 트릭스터 원형에 대해 진지하게 관조할 수 있을 뿐이라는 것을 보여준다.

• 미술자료
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• 제104권
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• pp.40-69
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• 2023

본고는 조형적으로 일반 그릇과 차별화되는 청자 주기의 형태에 주목하여 왕실 연례 문화와의 관계를 조명하고 조형적 상징성과 시기별 조합의 변화를 살펴보았다. 『고려사(高麗史)』 세가(世家)에서 확인되는 국왕의 재위별, 연례의 유형별 설행 횟수와 설행 목적을 통해서 청자 주기와의 관련성을 살펴보았다. 왕실 연례는 군신(君臣) 간의 위계질서를 확립하고 유대감을 구축하는 왕권 강화의 수단이자 왕의 업적과 성덕을 찬양하여 국왕의 권위와 능력을 보여 주는 통치 행위이기도 하였다. 왕실 연례의 설행 횟수는 실제 왕권 강화를 시도했던 예종대(1105~1122), 의종대(1146~1170), 충렬왕대(1274~1308), 공민왕대(1351~1374)에 늘어나는 상황을 볼 수 있었다. 왕실 연례의 설행이 급증하고 연례 문화가 바뀌는 예종대와 충렬왕대를 기점으로 청자 주기의 기종 및 조형이 변화하는 상황에 주목하였다. 연례에서 국왕과 신하는 다양한 음주 행위를 통해서 국왕의 장수를 기원하거나 태평한 시절을 찬미하였기 때문에 술을 담고 따르는 주기의 조형은 시각적 상징성이 강조될 수밖에 없다. 연례에서 음주 방법은 국왕이 신하에게 또는 신하가 국왕에게 직접 술을 따르기 때문에 주자와 잔의 조형은 참석자들에게 시각적으로 큰 효과가 있었다. 따라서 12세기에 신선, 난(鸞), 귀룡, 어룡, 호로병 등의 도교적 소재나 황촉규와 같은 유교적 소재가 청자 주자와 잔으로 조형화되는 현상은 국왕에 대한 송축(頌祝)과 충성, 불로장생을 기원하는 연례의 목적이 시각화된 것으로 볼 수 있다. 특히 연례에서 부르는 헌선도(獻仙桃)나 환궁악(還宮樂)의 내용이 청자 주기의 조형과 일치하는 점이 주목되었다. 연례에서 사용하는 당악(唐樂)의 가사는 국왕의 불로(不老), 난로(難老), 장생(長生)을 기원하고 왕업의 번창과 태평성대의 모습을 표현하였다. 이러한 가사 내용이 국립중앙박물관 소장 <청자 인물형 주자>나 시카고미술관 소장 <청자 승난인물형 주자> 등의 조형에 반영되었다. 주기의 조형에 연례 문화의 일면이 시각화된 사례는 고려청자에서만 볼 수 있는 특징이다. 주기의 조합은 연례의 분위기나 술의 종류에 따라서 시기별로 변화를 보인다. 고려가 몽골제국으로 편입된 이후에 새로운 술이 유입되고 연례 문화가 변화하면서 주기의 용도와 조합에 큰 변화가 있었다. 충렬왕대부터 원 황실의 영향으로 왕과 공주가 함께 연례를 개최하거나 몽고식 연회인 보르차연[孛兒扎宴]이 열리고 몽고 여인들이 쓰는 고고관(姑姑冠)을 쓰고 연회를 여는 변화를 볼 수 있다. 충렬왕대에 연례 문화가 변하기도 하지만 설행 횟수가 132회로 급증하는 것은 원 황실 공주와의 혼인으로 인한 왕권 강화의 측면도 있다. 급증한 연례에서 이전에는 없었던 포도주, 동락(湩酪), 소주 등의 새로운 술과 함께 고족배(高足杯), 옥호춘병, 이(匜), 용두잔 등 신기종의 청자 주기가 등장하였다. 새롭게 나타난 청자 주기는 모두 원 황실이나 몽골제국의 일원인 칸국에서 사용된 금속기 등을 모본으로 하여 제작된 것이다. 고려 후기에 청자 주기의 변화는 기존 연구보다 시야를 확대하여 유라시아 일대에 위치했던 칸국들의 잔치 모습이나 주기와 비교하여 좀 더 구체적인 접근을 시도하였다. 이전에 없었던 고족배, 이, 용두잔, 옥호춘병 등 새로운 형태의 주기가 유입되었고 이러한 흐름에 맞춰서 청자 주기의 조합과 용도도 자연스럽게 변화하는 상황을 볼 수 있었다. 이러한 새로운 양식의 청자 주기는 공간적, 지리적으로 연결될 것 같지 않은 고려와 몽골제국의 칸국을 연결시키는 매개체 역할을 하였다. 본고는 청자 주기와 왕실 연례 문화와의 관련성을 조명하였지만 이는 고려청자의 용례를 연구하는 시작에 불과할 뿐이다. 앞으로 좀 더 다양하고 폭넓은 관점에서 청자의 사용처와 사용례를 밝히는 연구가 더 많이 진행되기를 기대한다.

• 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.