• Tuberculosis and Respiratory Diseases
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• 제49권4호
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• pp.441-452
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• 2000

연구배경 : 특발성 폐섬유화증에서는 폐암이 호발하는 것으로 알려져 있다. 그동안 이러한 폐암의 호발은 '반혼암'이라는 개념으로 설명되어 왔고 전통적으로는 조직형 중 선암이 가장 많다고 알려져 있었으나 최근에는 편평상피암이 가장 많다는 보고도 있어 논란이 있었다. 그동안의 대부분 연구에서 대상 환자들은 높은 흡연력을 가진 흡연자들이었으나 이 점을 고려하여 섬유화와 연관된 폐암만을 따로 분리하여 분석한 연구는 없었다. 본 연구에서는 특발성 폐섬유화증에 발생한 폐암 중 "섬유화와 연관된 폐암"과 "섬유화와 무관한 폐암"을 나누어 보고 얼마나 많은 폐암이 섬유화와 연관하여 발생하는가, 그리고 섬유화와 연관된 폐암에서는 어떤 조직형이 가장 흔한가를 알아보고자 하였다. 방법 : 1988년 1월부터 1998년 7월 사이에 서울대학교 병원에서 특발성 폐섬유화증에 병발된 폐암으로 진단 받은 환자들을 대상으로 하여 후향적으로 연구를 하였다. 흡연력, 폐암과 특발성 폐섬유화증의 진단 시기, 폐암의 조직형, 폐암의 위치를 조사하였는데 특히 폐암이 섬유화가 진행된 폐실질에서 발생하였는지 여부를 조사하였다. 특발성 폐섬유화증에서 발생하는 폐암중 섬유화와 직접 관련되어 발생하는 폐암이 얼마나 되는지 평가하고자 폐암의 발생 위치에 섬유화가 동반 되어 있는가에 따라 폐암을 분류하려고 시도하였다. 즉, 흉부 전산화 단층 촬영을 검토하여 폐암이 섬유화 병변이 있는 위치에 발생한 경우를 "섬유화와 연관된 폐암"으로, 섬유화 병변과 무관한 위치에 발생한 폐암을 "섬유화와 무관한 폐암"으로 정의하였다. 특발성 폐섬유화증 환자에서 발생한 폐암의 조직형 빈도를 비교하기 위한 대조군으로 1997년도 한국중앙암등록사업 연례보고서 중 폐암의 조직형 분포를 사용하였다. 결과 : 57명의 환자들(남자 54명, 여자 3명)이 대상이 되었다. 특발성 폐섬유화증으로 추적 관찰 중 폐암을 진단 받은 환자가 11%인 6명이었고 나머지 환자들은 폐암과 특발성 폐섬유화증을 동시에 진단받았다. 94.2%인 49명이 흡연자였고 평균 흡연량 47.1$\pm$21.9갑년으로 높은 흡연율을 보였다. 폐암의 위치와 섬유화와의 연관성에 따라 분류하였을 때 "섬유화와 연관된 폐암"이 42명(80.8%), "섬유화와 무관한 폐암"이 10명(19.2%) 이었으며 섬유화와 무관한 위치에 발생한 폐암은 섬유화 병변으로 인해 발생한 반흔 암이 아닌 흡연 등에 연관된 폐암으로 생각되었다. 폐암의 조직형은 전체적으로는 편평상피암이 가장 많고 한국중앙암등록사업 연례보고서 결과와 차이가 없었으나 섬유화와 연관된 폐암만을 따로 살펴 보았을 때에는 선암이 42.9%로 가장 흔한 조직형이었으며 섬유화와 무관한 폐암과는 조직형의 분포에 유의한 차이가 있었다. 결론 : 특발성 폐섬유화증과 병발된 폐암 환자의 81%는 섬유화가 진행된 부위에 폐암이 발생하여 섬유화와 연관된 폐암 발생이 인정되었으나 19%는 섬유화와 무관하게 흡연 등의 인자에 의해 폐암이 발행한 것으로 판단되었다. 전체적으로는 편평 상피암이 가장 많았으나 섬유화와 연관된 폐암만을 대상으로 하였을 때는 선암이 가장 흔한 조직형이었다.

• Journal of Chest Surgery
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• 제35권3호
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• pp.188-198
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• 2002

목적: 대동맥근부 혹은 상행대동맥에 대한 재수술은 증가하고 있으나 재수술에 대한 결과 및 재수술을 예방할 수 있는 적절한 방법에 대한 연구는 많지 않다. 본 연구는 대동맥근부 혹은 상행대동맥 질환에 대한 재수술 결과 및 재수술을 예방할 수 있는 적절한 방법에 대해 알아보고자 하였다. 대상 및 방법: 1995년 5월부터 2001년 4월까지 대동맥근부 혹은 상행대동맥 질환으로 재수술을 받은 환자 30명을 대상으로 후향, 조사하였다. 최종 선행수술에서 재수술까지 기간은 평균 56$\pm$50개월(3-142개월)이었다. 재수술 적응증으로는 진성 상행대동맥류 7명(23.3%), 인공판막심내막염이 6명(20%), 가성동맥류 5명(16.7%), Behcet씨 병과 관련한 대동맥판륜 주위 누출 4명(13.3%), 인공 대동맥판막 기능부전 4명(13.3%), 그리고 대동맥박리증 3명(10%) 및 대동맥판륜확장증 1명이었다. 재수술은 대동맥근부 치환술 17명(56.7%), 상행대동맥 치환술 8명(26.7%), 대동맥판-승모판 연속의 섬유체 및 판륜 재건을 이용한 이중판막치환술 2명, 패취를 이용한 상행대동맥 성형술 2명, Bentall 술식 후 이중판막 치환술 1명이었다. 수술은 7명에서 체외순환하에 흉골절개를 하였고 16명(53.3%)에서 완전순환정지를 이용하였다. 평균 순환정지 시간은 20$\pm$12분, 체외순환 및 대동맥차단 시간은 각각 228$\pm$56분과 143$\pm$64분이었다. 결과 조기 사망은 3명(10%)에서 있었다. 합병증으로는 재수술이 필요했던 출혈이 7명(23.3%), 심장 합병증 5명(16.7%), 일과성 급성 신부전 2명, 간질 발작 2명, 그리고 기타가 5명이었다. 술후 생존자 27명에서 평균 22.8$\pm$20.5개월을 추적조사한 결과: 만기사망은 2명(7.4%)에서 있었으며 술후 6년 actuarial survival rate는 92.6$\pm$5.0%였다. 대동맥근부 혹은 상행대동맥 재수술 후 다시 재수술이 필요하였던 경우는 1명이었고(3.7%), 술후 1년과 6년 재수술로부터의 actuarial freedom rate는 각각 100%와 83.3$\pm$15.2%이었다. Behce씨 질환이 있는 1명이 동종이식편으로 근부치환술 후 가성동맥류가 발생하여 재수술이 필요한 상태이다. 혈전색전증이나 항응고제 관련 합병증은 없었다. 결론: 본 연구 결과 대동맥근부 혹은 상행대동맥의 재수술은 비교적 낮은 사망률과 이환율을 보이며 또한 재수술을 예방하기 위해서는 선행수술 및 재수술시 원인질환에 따른 적절한 수술 방법의 선택이 매우 중요할 것으로 사료된다

• 한국초지조사료학회지
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• 제27권2호
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• pp.93-100
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• 2007

본 연구는 섬유질배합사료의 조단백질 수준이 임신초기 흑염소의 사료섭취량, 영양소 소화율 및 질소 축적율에 미치는 영향을 조사하여 임신흑염소의 적정 조단백질 수준을 구명하기 위하여 실시하였다. 공시축은 임신초기흑염소 12두를 4처리구(관행사료구, 조단백질 10, 12 및 15%)로 나누어 처리구당 3두씩 대사케이지에 완전임의 배치법으로 배치하여 시험을 실시하였으며 그 결과는 다음과 같다. 섬유질배합사료의 일반 조성분은 건물 함량이 $89.0{\sim}91.0%$를 나타내었고, ADF와 NDF 함량은 $18.87{\sim}19.85$ 및 $53.41{\sim}54.80%$로 나타나 조단백질 수준에 따른 섬유소 함량의 차이는 없었다. 조단백질 함량은 TMR10, TMR12 및 TMR14구가 각각 10.61, 12.15 및 14.97% 이었다. 하지만, NFC 함량은 섬유질배합사료내 단백질수준이 증가함에 따라 감소하였다. 건물섭취량, 영양소 섭취량 및 가소화 영양소 섭취량은 TMR15와 대조구가 TMR10과 TMR12구 보다 유의하게 높았으며(p<0.05), 대사체중당 건물섭취량과 체중에 대한 건물섭취비율에서도 대조구와 TMR15구가 유의하게 높았다(p<0.05). 건물소화율은 $69.01{\sim}70.33%$ 범위로 나타났다. 에테르 추출물 소화율은 세 수준의 단백질을 함유하는 섬유질배합사료군이 대조군 보다 유의하게 높았으나(p<0.05), 섬유질배합사료군간에는 유의한 차이가 나타나지 않았다. 질소축적량 및 축적율에서는 TMR15구와 대조구가 다른 처리구 보다 유의하게 높게 나타났다(p<0.05). 이상의 결과에서 임신초기 흑염소사료 내 증가하는 수준의 조단백질 함량은 건물섭취량 및 질소 축적을 증가시켰고, 특히 TMR 사양에서 임신초기 흑염소의 조단백질수준은 적어도 15% 이상은 되어야 할 것으로 추정된다.조생 다수성 IRG, 6월 상순으로 벼 이앙시기가 늦을 경우에는 5월 하순 수확이 가능하면서 생산성과 사료가치가 높은 밀이 권장되었다.함량으로 낮아졌다. 비보존성 반응(즉 침전, 흡착, 산화, 용해 등)과 보존성 반응(예: 수리학적 혼합)은 미량원소가 강으로 이동되는 것을 크게 감소시키는 효과적인 자연저감 기작이었다.가되는 추세를 보이고 있었으나 정상군에 비해 면역반응 신경세포의 총수는 43.9%(1형: $23.7%\downarrow$, 2형: $17.8%\downarrow$, 3형 : $56.2%\downarrow$) 감소한 상태로 남아있었다. 이상의 결과로 capsaicin 투여에 의해 성숙흰쥐의 근육층 신경얼기에서 칼슘채널 ${\alpha}_{1B}$ subunit의 면역활성도는 투여 후 1주일가지 빠르게 저하되며 그 이후부터는 점차 정상으로 회복되나 완전한 상태로의 회복에는 4주 이상의 시간경과가 필요함을 알 수 있었다.形態學的) 배양학적(培養學的) 특성(特性)을 조사(調査)한 결과(結果) Candida guilliermondii var. guilliermondii 로 동정(同定)되었다. 6. CHS-13 균주(菌株)를 당화액(糖化液)에 배양(培養)시켰을 때 Lowry-protein 함량은 $0.72\;mg/m{\ell}$ 이었으며 , yeast extract 첨가(添加)하여 배양시(培養時)는 yeast extract 농도(濃度)가 증가(增加)함에 따라 단백질(蛋白質) 함량(含量)도 증가(增加)하였다. 7. CHS-13 균주(菌株)의 RNA 함량(含量)은 $4.92{\times}10^{-2 }\;mg/m{\ell}$이었으며 yeast extract 농도(濃度)가 증가(增加)함에 따라 증가(增加)하다가 농도(濃度) 0.2%에서 최대함량(最大含量)을 나타내고 그후는 감소(減少)

• Tuberculosis and Respiratory Diseases
• /
• 제43권5호
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• pp.671-682
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• 1996

연구배경: 결핵은 아직 우리나라에서 중요한 질병중 하나이고, 기관지결핵은 진단이 용이하지 않고, 기도협착등 합병증을 초래하여 임상적으로 중요성이 인식되어 왔으나 적절한 치료법이 확립되어 있지 않고, 각 보고자마다 내시경적 분류를 다르게 하고 있다. 이에 저자들은 1991년1월 부터 1996년 4월간 한양대학교 부속병원에서 기관지결핵으로 진단된 201예를 대상으로 기관지결핵의 임상상을 알아보고자 하였다. 방법: 1991년 1월 부터 1996년 4월 까지 한양대학교 부속병원에서 기관지내시경으로 기관지결핵으로 진단된 201예를 대상으로 임상상에 대한 후향적 분석을 하여 다음의 결과를 얻었다. 결과: 1) 총 기관지내시경을 실시한 1031예 중 기관지결핵으로 진단된 환자는 201예 (19.5%)였고, 이중 남자 55예, 여자 146예로 여자가 남자에 비해 2.7배 많았다. 연령분포는 20-29세가 61예(30.3%)로 가장 많았으며, 30-39세가 40예(19.9%), 50-59세가 27예(13.4%), 40-49세가 21예(10.4%), 15-19세가 19예(9.5%), 60-69세가 19예(9.5%), 70세 이상이 14예(7.0 %) 순이었다. 2) 증상 및 증후로는 기침 74.5%과 객담 55.2%이 가장 많았으며, 호흡곤란 28.6%, 흉통 19.8%, 발열감 17.2%, 천명음 15.6% 객혈 11.5%순이었다. 3) 방사선 소견으로는 침윤 67.7%, 허탈 43.9%, 동공형성 11.6%, 흉막삼출 7.4% 순이었고, 정상인 예도 6예(3.2%)이었다. 침범부위는 좌상폐야 39.7%, 우상폐야 36.0%, 우중폐야 24.3%, 좌하폐야 21.2%, 좌중폐야 18.5%, 우하폐야 14.8% 순이었다. 4) 폐기능 검사를 실시한 76예의 결과는 정상소견이 44.7%, 제한성 양상이 39.5%, 폐쇄성 양상이 11.8%, 혼합형 양상이 3.9% 순이었다. 5) 기관지내시경 소견으로는 건락성 물질인 백색의 가막형성의 건락성 가막형이 70예 (34.8%)로 가장 많았으며, 점막의 발적 및 부종의 점막형이 54예(26.9%), 과형성성 소견의 파형성형이 52예(25.9%), 섬유화에 의한 협착소견의 섭유화 협착형이 22예(10.9%), 그리고 미란이나 궤양의 궤양형이 3예(1.5%) 순이었다. 6) 각 검사별 양성률은 기관지세척액에서 도말항산균 양성률이 51.2%, 배양양성이 27.4%, 기관지정 조직검사에서 항산균 양성률이 36.4% 항산균이 없는 육아종소견이 13.1%, 만성 염증소견이 36.4%, 확진을 못한 경우가 14.1%였다. 건락성 가막형의 조직검사 검체에서 항산균의 발현과 기관지 세척액에서 결핵군 배양양성률이 각각 44예 중 24예(54.5%; P=0.013), 70예 중 29예(41.4 %; P=0.009)로 높게 나타났다. 결론: 젊은 여성에 있어서 일반 진해제에 잘 반응하지 않는 기침이 오랫동안 지속될시 흉부 액스선 검사가 정상이고, 객담 도말항산균 검사가 음성이더라도 기관지결핵을 의심해야 하고, 확진을 위한 기관지내시경을 실시하여야 한다. 그리고 치료에 반응이 좋지 않은 천식이나, 폐암의 발생이 높은 노년층에 있어서도 감별진단을 위하여 또한 기관지내시경을 실시하여야 한다. 향후 기관지내시경에 의한 기관지결핵의 통일된 분류 및 스테로이드의 항결핵제와의 병용이 기도협착에 미치는 효과에 대한 잘 설계된 대조군 설정의 전향적 연구가 필요하리라 생각된다.

• Tuberculosis and Respiratory Diseases
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• 제49권5호
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• pp.601-613
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• 2000

연구배경 : 통상성 간질성 폐섬유증(usual interstitial pneumonia : UIP)은 특발성 간질성 폐렴(Idiopathic interstitial pneumonia : I.I.P)의 한 형태로서 생존기간 중앙값이 약 3-5 년 정도로 보고되는 치명적인 질환으로 알려져 있으나, 최근 분류된 BOOP이나 NSIP등을 제외한 순수한 UIP환자들만을 대상으로 임상경과나 예후에 대한 연구는 외국에서도 극소수아고, 국내에서는 보고된 바가 없다. 이에 연구자들은 수술적 폐생검 검사로 확진된 UIP 환자들의 임상경과와 예후의 예측 지표를 찾고자 본 연구를 시행하였다. 방법 : 1989년 3월부터 1999년 8월까지 서울중앙병원에서 개흉 또는 흉강경을 통한 폐생검검사로 UIP로 진단된 72명(연령 $58.2{\pm}11.6$세, 남 : 여=45:27, 관찰기간 중앙값 : 18.1개월 (0.7-103.6개월))을 대상으로 하였다. 진단시의 임상증상과 흉부고해상도단층촬영, 폐기능검사, 동맥혈 가스검사 등을 증상점수(C) (1-20점), 방사선학점수(R)(봉와양 소견 : 0-5점, 젖빛유리야 소견 : 0-5점) 및 생리적검사점수(P) (FVC 1-12점, $FEV_1$ 0-3점, TLC 1-10점, $D_{LCO)$ 0-5점, $AaDO_2$ 0-10점)로 수치화하여 CRP 접수를 계산하였다. 임상경과와 진단시의 CRP점수, 기관지 폐포세척액검사 등을 비교 분석하여 예후의 예측지표를 검색하였다. 결과 : 1) 대상 UIP환자들의 1년 누적생존률은 78.3%, 3년 누적생존률은 58.1% 였고, 생존기간 중앙값은 42.5개월이었다. 2) 단기(1년)예후 : 단기 사망군(14명)은 생존군(46명)에 비하여 전체CRP점수($28.6{\pm}8.3$ vs. $16.6{\pm}9.7$)가 높았으며, 이는 주로 증상점수($8.4{\pm}2.1$ vs. $5.7{\pm}3.9$)와 FVC, $D_{LCO)$, $AaDO_2$를 포함하는 생리적검사점수 $v{\pm}7.5$ vs. $8.1{\pm}7.3$)의 차이에 기인하였다. 또한 호전 혹은 안정군(61.7%)과 악화군 및 사망군(38.3%) 사이에는 연령과 흡연률, 진단당시의 CRP점수(증상점수, FVC, $AaDO_2$, $D_{LCO)$)가 유의한 차이가 있었다. 그러나 방사선학점수, TLC 및 기관지폐포세척액소견 등은 유의한 차이가 없었다. 2) 장기(3년) 예후 : 장기생존군(14명)은 사망군(22명)에 비하여 역시 진단시 총CRP점수($12.2{\pm}6.7$ vs. $28.7{\pm}7.9$)와 증상점수, FVC, $D_{LCO)$, $AaDO_2$)가 차이가 있었다. 3) 생존기간분석에서도 총 CRP 점수와 증상점수, $AaDO_2$ FVC, $D_{LCO)$가생존기간과 유의한 상관관계를 보였다. 4) Cox 회기분석을 이용한 다변수 분석에서는 $D_{LCO)$ (${\geq}$60% : Hazard ratio : 4.56, 95% CI : 2.30-16.04)만이 UIP환자 사망의 독립적인 예측인자로 나타났다. 결론 : 이상의 결과는 UIP 진단시의 $D_{LCO)$는 UIP환자의 예후를 예측할 수 있는 임상적 지표임을 시사하였다.

• Radiation Oncology Journal
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• 제16권4호
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• pp.485-495
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• 1998

목적 : 최근들어 연부 조직 육종의 치료방법이 광범위 구획절제에서 사지기능을 보존하는 제한적 수술과 방사선/항암화학요법의 다병용치료로 변환되고 있으며 광범위 수술과 유사한 치료성적을 거두고 있다. 저자들은 수술후 방사선 치료를 시행한 연부 조직 육종 환자를 대상으로 치료 결과 및 실패 양상을 알아보고 관련된 예후 인자를 분석하여 수술 후 방사선치료의 역할을 알아보고자 하였다. 대상 및 방법 : 대상환자는 1983년부터 1994년까지 치료한 60명이었고 모두 추적관찰이 가능했으며 평균 추적기간은 50개월이었다. 원발병소는 상$\cdot$하지가 35례(58$\%$)로 가장 많았고 체간 12례(20$\%$), 두경부 7례(12$\%$)였으며 병리학적 유형에 따른 구분은 악성섬유구종 14례(23$\%$), 지방육종이 10례(17$\%$), 악성신경섬유종 7례(12$\%$) 등 이었다. 전체환자중 6례를 제외하고는 조직학적등급의 분석이 가능했고 grade I, II, III가 각각 27례(45$\%$), 3례(5$\%$), 24례(40$\%$)였다. 수술적 절제는 19례(32$\%$)에서 광범위절제, 36례(50$\%$)에서 변연절제, 5례(8$\%$)에서 국소절제를 시행하였다. 방사선치료선량은 28.8-80Gy였고 25례에서 방사선치료와 함께 항암화학 요법을 병용하였다. 결과 : 최종분석 시 실패 양상은 국소재발이 20례(25$\%$), 원격전이 7례(12$\%$), 국소재발과 원격전이를 동반한 경우가 14례(23$\%$)였다. 원격전이한 환자는 구제치료와 상관 없이 모두 사망하였고 국소재발한 환자중 5명이 구제치료에 성공하여 무병생존하였다. 전체환자의 2년 및 5년 국소제어률은 68.0$\%$와 48.7$\%$로 비교적 저조한 결과를 보였다. 국소제어을에 영향을 미친 예후인자는 조직학적 유형, AJCC 병기, 조직학적 등급, 수술의 범위, 수술절연 침범 유무 및 잔존종양 정도, 림프절 전이 유무(p<0.05)였다. 전체 환자의 5년 생존률과 5년 무병생존률은 각각 60.4$\%$, 36.6$\%$였고 평균 생존기간은 89개월이었다 단변량 분석에 의한 생존률에 영향을 미친 예후인자로는 조직학적 유형, AJCC 병기, 림프절 전이 유무, 조직학적 등급, 수술절연 침범 유무와 잔존 종양 정도 였다. 결론 : 결론적으로 본 연구 결과 연부 조직 육종에서 제한적 수술과 수술 후 방사선치료로 비록 저조한 국소제어률을 보였으나 사지 절단 혹은 광범위 구획절제와 비교시 유사한 생존률을 얻었다.

• 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.