• Journal of Nutrition and Health
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• 제44권6호
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• pp.537-550
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• 2011

본 연구에서는 고혈압 유병율이 높고 소금이 다량 함유된 김치, 장아찌, 장류 위주의 식생활을 하는 농촌 성인의 고혈압 및 만성 퇴행성 질병의 유병율을 낮추는데 도움을 주는 기초자료를 마련하고자, 농촌의 중년기 이후 성인의 식습관 및 건강습관과 식염섭취 행동을 조사하고 이에 영향을 미치는 식행동 요인들을 조사하였다. 조사 대상은 충북 옥천군의 옥천읍과 8개면 성인 주민을 대상으로 비례추출에 의해 402가구를 선정하고 가구당 1인씩 총 402인을 유의 추출하였다. 1% 소금물에 대한 짠맛 민감도를 조사하여 민감군, 보통군, 둔감군의 세 군으로 분류하고 각 군의 식행동과 주변인의 영향과 지원을 분석하였다. 1) 본 연구 대상자는 남자 133명 (33.1%), 여자 269명 (66.9%), 총 402명으로 평균 연령은 $58.9{\pm}9.4$세로 남녀 모두 61~70세 (40.0%)가 가장 많았다. 2) 조사대상자의 평균 체질량 지수 (kg/$m^2$)는 남자 $23.6{\pm}3.5$, 여자 $24.6{\pm}3.3$로 여자가 남자에 비해 과체중의 경향이 컸다. 허리-엉덩이 둘레비 (WHR)도 남자 $0.90{\pm}0.12$, 여자 $0.92{\pm}0.49$로 여자가 높았고, 연령별로는 모두 50~64세 (남 $0.92{\pm}0.13$, 여 $0.98{\pm}0.74$)에서 가장 높았다가 65세 이상에서 감소하였다 (남 $0.89{\pm}0.09$, 여 $0.90{\pm}0.05$). 3) 평소 먹는 음식의 간에 대한 응답에서 보통으로 먹는다 38.1%, 짜지 않게 먹는다 35.1%, 짜게 먹는다 26.9%의 순서로 많았는데, 65세 이상의 최고령층에서 짜게 먹는다는 응답이 34.6%로 가장 많았다. 음식 간에 대해 자녀보다 더 짜게 먹는 다는 응답도 65세 이상의 최고령층에서 가장 높았다 (p < 0.01). 1% 소금물에 대해 50.3%는 짜다, 41%는 보통이다, 8.7%는 싱겁다고 응답하였다. 4) 식염섭취 관련 식습관 및 식행동 조사에서 짠맛 둔감군은 보통군이나 민감군에 비해 규칙적으로 식사하는 비율이 낮은데 반해, 과식비율, 10분 이내의 식사속도, 편식, 튀김선호 비율이 세 군 중 가장 높았다. 5) 식염섭취에 대한 견해 및 행동에서 짠맛 둔감군이 짠 음식을 습관적으로 가장 많이 섭취하였고, 짠 음식 섭취가 건강에 좋지 않다는 인식, 짜게 먹는 습관을 바꾸겠다는 의지나 실천도도 가장 낮았다. 6) 식염섭취 감소를 위한 지원이나 영향력이 가장 큰 사람은 배우자 등 가족보다 의료 및 영양 전문가들 (각각 58.4%, 56.8%)이었다. 7) 식염섭취에 대한 자아효능감 조사에서 식염 섭취 조절이 어렵다고 답한 경우는 매끼니 (46.3%), 배우자가 짠 음식을 좋아할 때 (45.2%), 외식 할 때 (36.3%)의 순으로 높았다. 특히 민감군은 매 끼니, 외식시, 배우자가 짠 음식을 좋아하는 경우 모두에서 식염조절 능력이 높은 편이었다. 8) 식품군별 섭취빈도에서 유의적인 차이를 나타낸 식품군은 채소류, 과일류, 매운 음식류로서, 민감군에서 채소류와 과일류의 섭취빈도가 높은 반면 둔감군은 매운 음식류에 대한 섭취빈도가 높았다. 농촌의 중년기 이후 성인의 식습관 및 건강습관과 식염섭취 행동을 조사한 결과, 짠 음식 섭취가 습관화된 행태를 보이며 식염 섭취와 인식정도에 비해 식염 저감을 위한 실천정도는 낮아 주민들이 손쉽게 실천할 수 있는 효과적인 저염섭취를 위한 식생활 실천방안의 제시가 요구된다. 또한 의료 및 영양전문가들을 통한 영양교육과 배우자 등 가족에 대한 교육이 강화되고 산업체에서의 저염식품 개발 등을 유도하여 염분섭취 감소를 위한 식생활 환경 구축과 실천 가능한 범국민적 저염식 영양교육 지원책이 정부차원에서 더 적극적으로 수립되어야겠다.

• Nuclear Medicine and Molecular Imaging
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• 제41권1호
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• pp.9-15
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• 2007

목적: 두부 외부에서 두뇌를 직접 자극하는 비침습적 두뇌 자극술인 경두개 자기자극(TMS, transcranial magnetic stimulation)은 특정 두뇌 부위를 자극하여 두뇌 활성을 증가 혹은 감소시킬 수 있다. 특히 반복 TMS(repetitive TMS, 이하 rTMS)는 우울증, 강박장애, 정신분열증 등 일부 신경 정신과적 질환의 새로운 치료법으로서의 가능성이 제시되면서 다양한 연구가 행해지고 있다. 이에 본 연구는 치료 저항성 우울증 환자를 대상으로 rTMS 치료 전후의 국소뇌혈류 변화를 알아보고자 하였다. 대상 및 방법: 1년 이상 적당한 항우울제 투여를 시도하였음에도 불구하고 치료에 반응하지 않았던 치료 저항성 우울증 환자 12명(남: 7, 녀: 5, 나이범위: $19{\sim}52$세, 평균나이: $29.3{\pm}9.3$세)을 대상으로 하여 3주간 15회의 rTMS(우측 전전두엽: 1Hz, 좌측 전전두엽: 20Hz) 치료 시행 전과 치료 후에 Tc-99m ECD SPECT를 얻었다. 치료 전과 후의 차이를 SPM2 소프트웨어를 이용하여 비교하였다.(t=3.14, uncorrected p<0.01, voxel=100) 결과: rTMS 치료 후에 좌측 측두엽 전내측부와 좌측 기저핵 그리고 양측 전전두엽 피질부위에 혈류가 유의하게 증가하였다. 또한 우측 전두엽과 좌측 후두엽에서는 혈류가 유의하게 감소하였다. 결론: 치료 저항성 우울증 환자의 rTMS 치료는 특정 부위 두뇌의 혈류 증가와 감소가 있음을 확인할 수 있었다. 치료 성과 및 개인 특성에 따른 차이에 대한 분석을 시행하고 보다 많은 수의 환자에서 자료가 확보된다면 rTMS 치료의 기전과 우울증의 병태생리를 규명하는데 rTMS-기능 뇌영상 연계 연구가 매우 유용할 것이다.인 PET 연구 절차를 고안하기 위해 고려해야 할 사항들에 대하여 논하였다.TEX>$29.9{\pm}1.8%$, DMF: $7.6{\pm}0.5%$이었다. MEK에서 얻은 $[^{11}C]1$의 비방사능은 98 ($GBq/{\mu}mol$)이다. 각 물질의 질량 분석은 1: m/z 257.3 (M+1), 2: 257.3 (M+1), 3: 271.3 (M+1)이었다. 각 생성물질의 표지효율은 MEK에서 $86.0{\pm}5.5%:5.0{\pm}3.4%:1.5{\pm}1.3%$ $([^{11}C]1:[^{11}C]2:[^{11}C]3)$, CHO에서 $59.7{\pm}2.4%:4.7{\pm}3.2%:1.3{\pm}0.5%$, DEK에서 $29.9{\pm}1.8%:2.0{\pm}0.7%:0.3{\pm}0.1%$, DMF에서 $7.6{\pm}0.5%:0.0%:0.0%$이다. 결론: $[^{11}C]1$은 4가지 반응용매 중 MEK 반응용매에서 가장 높은 표지효율을 나타냈다. 부산물인 $[^{11}C]3$은 고성능 액체 크로마토그래피의 자외선, 방사능 검출기와 질량 분석법을 통해 물질을 추정할 수 있었다.의 개선 효과가 있는 것으로 판단되며 지질과산화에 대해서 강한 억제 활성을 나타내는 것을 알 수 있었다. 이러한 결과로 복분자는 생활 습관병의 예방과 개선에 유효한 것으로 사료되었으며, 지질대사와 과산화지표의 검증을 통해 기능성 식품소재로 활용될 수 있음을 보여주었다.로서 역시 CTV 치료계획에서 적게 조사되었다(p=0.005). 기존의 ICRU 치료계획은 잔류종양의 크기가 작은 경우 불필요하게 정상조직에

• Neonatal Medicine
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• 제18권1호
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• pp.82-88
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• 2011

목적: 본 연구에서는 부신기능부전과 연관된 저혈압의 임상적 특성과 hydrocortisone 투여에 대한 치료반응을 알아보고자 하였다. 방법: 2007년 1월 1일부터 2009년 8월 31일까지 분당서울대학교병원에서 출생하여 신생아집중치료실에 입원했던 재태주령 32주 미만의 미숙아 158명 중 미숙아 부신기능부전과 연관된 저혈압이 발생하였던 12명의 환아를 대상으로 하였고 이들의 임상적 특성과 hydrocortisone 투여 전과 후의 평균혈압, 소변량, 혈청 전해질 검사 소견을 비교하였다. 결과: 환아의 재태주령은 27.8${\pm}$2.5주, 출생체중은 1,110${\pm}$307g이었고 부신기능부전과 연관된 저혈압이 발생한 시기는 생후19${\pm}$7일, 월경 후 주령으로는 30.6${\pm}$2.4주이었고 당시 체중은 1,285${\pm}$365 g이었다. Dopamine 투여에도 저혈압이 발생한 미숙아는 hydrocortisone을 4.0 mg/kg/day의 스트레스 용량으로 시작해 2.2${\pm}$0.7일간 유지 후 감량하였으며 hydrocortisone 투여 전의 혈청 cortisol 농도는 11.6${\pm}$4.1 mg/dL이었다. Hydrocortisone 투여 당시와 2, 4, 6시간 후의 평균혈압은 25.0${\pm}$5.4 mmHg에서 35.0${\pm}$5.3 mmHg, 38.3${\pm}$8.0 mmHg 그리고 41.9${\pm}$6.5 mmHg 로 증가되다가 그 후로는 안정적으로 유지되었고 소변량도 hydrocortisone 투여 전에 0.9${\pm}$0.6 mL/kg/hr에서 치료 6시간 후 4.1${\pm}$3.4 mL/kg/hr로 증가되었다. 치료시작당시와 12시간 후의 dopamine 용량은 11.0${\pm}$2.9 ${\mu}g$/kg/min에서 8.0${\pm}$2.3 $\mu$g/kg/min로 감량되었고 24시간 후에는 5.5${\pm}$3.4 ${\mu}g$/kg/min까지 감량되었다. 혈청 $Na^+$ 농도는 hydrocortisone 투여 전 130${\pm}$4 mEq/L에서 투여 12시간 후 136${\pm}$4mEq/L로 증가되었고 혈청 $K^+$ 농도는 hydrocortisone 투여 전6.1${\pm}$1.1 mEq/L에서 투여 12시간 후 4.6${\pm}$0.6 mEq/L로 감소하였다. 결론: 미숙아에서 부신기능부전과 연관된 저혈압이 발생한 경우 hydrocortisone의 투여는 신속히 혈압을 상승시키고 소변량을 증가시켰으며 전해질 농도를 정상화시켰다.

• Tuberculosis and Respiratory Diseases
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• 제44권1호
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• pp.124-135
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• 1997

연구배경 : 미만성 범세기관지염 (Diffuse panbronchiolitis)은 만성 기침, 화농성 객담과 호흡곤란을 주증상으로 하며, 호흡세기관지에 국한된 만성 염증성 질환으로 비교적 근래에 알려진 질환이다. 이 질환은 주로 일본에서 많이 보고되었는데, 우리나라에서 지금까지 발견된 환자의 수는 적으나 최근 수년간 이 질환에 대한 인식이 높아지면서 보고되는 증례가 많아지고 있다. 이 질환은 주로 임삼증상, HRCT 및 조직검사로 진단되는데, 특히 HRCT가 진단에 중요한 비중을 차지하는 것으로 알려져 있다. 하지만 HRCT 소견과 임상소견간에 어떤 상관관계가 있는지에 대해서는 아직 불확실하며, 폐환기주사에서 어떤 특정적인 소견이 나타나는 지에 대해서도 별로 연구된 바가 없다. 방법 : 이에 저자들은 최근 2년동안 미만성 범세기관지염으로 진단된 12명 환자들을 대상으로 임상적 특징을 관찰하고, HRCT 소견과 임상소견과의 상관관계를 관찰하는 한편, 폐환기주사에서 나타나는 특징적인 소견을 분석해 보았다. 결과 : l. 연령은 31-83세(평균 54.4세)에 분포하였고 남녀비는 4:8이었으며, 부비동염이 동반되었던 환자가 9명(75%)였다. 임상적 단계는 임상소견에 따라 3단계로 나누었는데, 각각 l 기(기관지수축과 저산소증)에 속하는 환자는 5명, 2기(기관지수축, 저산소증 및 호흡기 감염증)는 4명, 3기(기관지수축, 저산소증, 고탄산혈증, Pseudomonas에 의한 호흡기 감염증 및 우심부전)는 3명이었다. 2. HRCT 소견에 따라 4기로 나누었는데 l기는 한명도 없었으며, 2기가 4명, 3기가 5명, 4기가 3명으로서, 거의 모든 환자들이 발견 당시에 2기 이상임을 알 수 있었다. 그중 7예에서는 폐환기주사를 실시해 보았는데, 5예 (71.4 %)에서 이행부와 기도 중간부에 비정상적인 연무질침착이 나타나면서 말단 폐실질의 환기 결손소진을 보여서, 만성폐쇄성폐질환과는 대조적인 소견을 나타냈다. 3. 폐기능검사상 l예를 제외한 모든 환자에서 중등도 또는 중중의 폐쇄성 환기장애 소견을 보였고, 산소 투여없이 시행한 동맥혈가스 검사장 10예에서 저산소증, 2예에서 고탄산혈증의 소견을 나타냈다. 객담배양 검사상 P.aeruginosa가 자란 경우가 3예, K.pneumoniae는 2예, H. influenzae는 2예, S. aureus는 2예로 나타났다. 4. HRCT 병기가 높아질수록, 임상적 병기 (r=0.801, P < 0.01) 및 저산소증(r= -0.615, P < 0.05)이 심해지는 양상을 보였으며, ESR(r= 0.818, p < 0.01)도 상승되는 경향을 보였다. 또한 임상적 병기가 높아질수록 저산소증(r = -0.728, p < 0.01) 및 고탄산혈증 (r = 0.620, P < 0.05)이 심해지고, ESR(r= 0.662, p < 0.01)이 증가함을 알 수 있었다. 결론 : 이상의 결과로 보아 미만성 범세기관지염에서 HRCT 소견이 임상소견과도 밀접한 상관관계가 있기 때문에, HRCT는 미만성 범세기관지염의 진단, 중증도의 판정 및 경과 관찰에 유용할 것으로 생각된다. 또한 폐환기주사 역시 미만성 범세기관지염에서 특징적인 소견을 나타내므로, 이를 흉부 HRCT와 함께 병행한다면 미만성 범세기관지염의 진단이 더욱 용이할 것으로 추측되는 바이다.

• 한국가금학회지
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• 제39권2호
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• pp.87-95
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• 2012

본 연구는 사료 내 대사 에너지 및 조단백질의 수준별 급여가 산란종 수평아리의 생산성과 도체 특성에 미치는 영향을 조사하여, 전용 사료로서 요구되는 적정 영양 수준을 구명코자 실시하였다. 실험 동물은 1일령 Hy-Line Brown 수평아리 900수를 공시하여 대사 에너지를 두 가지 수준(2,800 kcal/kg 및 2,950 kcal/kg), 조단백질을 세 가지 수준(17%, 18.5% 및 20%)으로 하는 $2{\times}3$ factorial design으로 구성하여 처리당 5반복, 반복당 30수씩을 체중이 유사하도록 완전임의 배치하였다. 21일령, 53일령에 생체중, 사료 섭취량 및 사료 요구율을 조사하였고, 에너지 및 단백질 섭취량을 산출하였다. 53일령에 생체중 측정치의 평균에 해당하는 개체를 처리구별로 8수씩 선발하여 도계 후 가식성 부위 및 조직의 상대적 중량을 조사하였다. 혈중 콜레스테롤 및 간 기능 관련 효소의 활성을 측정하였다. 사료 섭취량은 대사 에너지수준이 높을수록 감소하였고(p<0.05), 대사 에너지${\times}$조단백질 상호작용 또한 유의적인 차이가 인정되었다(p< 0.05). 증체량과 사료 요구율은 대사 에너지 수준보다는 조단백질의 사료 내 수준이 17.0%에서 20.0%로 증가함에 따라 선형적으로 개선되는 결과를 나타내었으며(p<0.05), 대사 에너지${\times}$조단백질 상호작용은 나타나지 않았다. 사료 내 영양소 수준에 따른 에너지와 단백질의 섭취량은 대사 에너지${\times}$조단백질 상호작용에 의한 유의한 차이나 경향이 관찰되었다. 1 g 증체에 요구되는 에너지 섭취량은 조단백질 수준이 증가함에 따라 선형적으로 낮아졌고(p<0.001), 수당 단백질 섭취량은 저에너지구(2,800 kcal/kg)가 고에너지구(2,950 kcal/kg)에 비하여 유의하게 높았으며(p<0.05), 조단백질 수준의 증가에 따라 유의하게 높아졌다(p<0.001). 1 g 증체에 요구되는 단백질 섭취량 역시, 조단백질 수준의 증가에 따라 선형적으로 증가하였다(p<0.01). 간, 비장, 가슴육 및 다리 부위의 상대적 중량에서는 유의한 차이가 관찰되지 않았다. 총 콜레스테롤, GOT 활성, BUN, 크레아틴 역시 유의한 차이를 나타내지 않았으나, GPT 활성에서 대사 에너지 2,950 kcal/kg 처리구가 대사 에너지 2,800 kcal/kg 처리구에 비하여 높은 경향을 보였고(p=0.056), 혈청 알부민에서 대사 에너지${\times}$조단백질 상호작용이 관찰되었다(p<0.05). 본 연구 결과, 산란종 수평아리의 증체량과 사료 요구율은 대사 에너지 수준보다는 조단백질 수준 증가에 따라 선형적으로 개선되는 것으로 나타났으며, 이를 통해 대사 에너지 2,800 kcal/kg 및 2,950 kcal/kg의 급여 수준의 차이는 성장에 미치는 영향이 미미한 것으로 판단할 수 있었다. 각 기간별로도 사료 내 대사 에너지 및 조단백질 수준에 따른 일정한 경향이 유지되었고, 대사 에너지 및 조단백질 수준별 급여가 도체특성, 혈액조성에 크게 영향을 미치지 않았다. 따라서 대사 에너지 2,800 kcal/kg 수준과 조단백질 18.5% 수준 이상의 사료 급여가 산란종 수평아리의 육성에 있어서 가장 적정한 영양 수준인 것으로 사료된다.

• 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)
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• 한국우주과학회 1993년도 한국우주과학회보 제2권2호
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• pp.17-17
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• 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.

• Journal of Nutrition and Health
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• 제48권1호
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• pp.30-45
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• 2015

본 연구는 베리아트릭 수술 중 위 밴드 수술을 시행한 고도비만 환자의 특성을 밝히고, 수술 후 영양교육을 받은 횟수의 차이가 체중감량에 미치는 영향을 평가하기 위해 시행되었다. 위 밴드 수술을 시행한 환자 중 수술 후 15개월이 경과한 고도비만 환자의 의무기록을 이용한 후향적 조사이다. 총 60명을 연구 대상으로 선정하였으며, 전체 연구 대상자들이 개별적으로 이루어진 영양교육을 받은 횟수의 평균을 기준으로 평균 보다 작은 경우 소교육군으로, 평균보다 높은 경우 다교육군으로 분류하여 조사하였다. 본 연구의 결과를 요약하면 다음과 같다. 첫째, 본 연구의 연구 대상자는 총 60명으로 소교육군은 29명, 다교육군은 31명으로, 위 밴드 수술 전에 조사된 성별, 연령, 신장, 체중, BMI 모두 두 그룹간의 유의적인 차이가 없었다. 혈압과 맥박은 이완기 혈압과 맥박은 두 그룹간의 유의적인 차이가 나타나지 않은 반면 수축기 혈압에서 다교육군이 소교육군보다 유의적으로 높게 나타났다. 둘째, 위 밴드 수술 전에 조사 된 연구 대상자들이 가지고 있는 건강 관련 생활 습관은 음주, 민간요법, 흡연 순으로 나타났다. 음주, 흡연에서는 두 그룹간의 유의적인 차이가 나타나지 않았으나 민간요법 사용 여부에서 다교육군이 유의적으로 높게 나타났다. 셋째, 연구 대상자의 위 밴드 수술 전에 조사된 비만관련 합병증과 보유증상은 등, 허리, 무릎 통증, 코골이, 생리불순, 위-식도역류질환, 수면문제, 고혈압, 수면무호흡증, 당뇨병, 고지혈증 등의 순으로 나타났다. 우울증과 코골이에서 두 그룹간의 유의적인 차이가 나타났다. 우울증의 경우 다교육군이 유의적으로 높았으며, 코골이의 경우 소교육군이 유의적으로 높게 나타났다. 넷째, 연구 대상자들의 식습관 중 속식을 하는 경우가 가장 많았으며, 그 다음으로 과식, 불규칙한 식사 시간, 스트레스성 식사, 잦은 간식 섭취, Junk Food 섭취, 야식, 단 음식 섭취 순으로 나타났다. 식습관은 두 그룹간의 유의적인 차이는 나타나지 않았다. 다섯째, 대부분의 연구 대상자가 비수술적 요법을 시행한 경험이 있으며, 약물요법을 가장 많이 시행한 경험이 있다고 답하였다. 그 다음으로 운동요법, 식사요법, 행동수정요법 순으로 나타났다. 연구 대상자의 위 밴드 수술 전에 조사된 비수술적 요법 시행 여부는 두 그룹간의 유의적인 차이는 나타나지 않았다. 약물요법을 소교육군은 4가지 이상 시행한 경우가 가장 많았고, 다교육군은 1가지, 3가지를 시행한 경우가 가장 많았다. 운동요법을 소교육군은 유산소 운동만 한 경우가 가장 많았고, 다교육군은 유산소 운동과 근력 운동을 병행한 경우가 가장 많았다. 식사요법으로 가장 많이 사용한 방법은 두 그룹 모두 보조식품을 이용하는 것으로 나타났다. 여섯째, 신체조성 측정 결과 수술 후 6개월까지는 체지방, 체중이 급격히 감소하였고, 그 후에는 완만하게 감소하였다. 체지방과 체중은 수술 후 15개월 차에 영양교육을 더 많이 받은 다교육군이 소교육군 보다 유의적으로 낮게 나타났다. 일곱째, 수술 전과 수술 후 기간 경과에 따른 비만 지표 체중과 체지방의 감소와 비슷한 변화 양상을 나타내었다. BMI와 비만도는 수술 후 15개월 차에 소교육군에 비해 다교육군이 유의적으로 낮게 나타났다. 교육 횟수가 증가 할수록 수술 전에 비해 수술 후 15개월에 BMI 감소 정도가 증가하는 것으로 나타났다. 여덟째, 연구 대상자의 위 밴드 수술 전과 수술 후 6개월 차의 생화학적 지표를 조사한 결과 대부분이 정상 범위에 있는 것으로 나타났다. ALT, 중성지방, 총 콜레스테롤이 수술 전 정상범위보다 높게 나타났으나 수술 후 6개월 차에 정상범위 수준으로 감소하였다. 간 기능 지표를 나타내는 AST와 ALT는 수술 전에 비해 수술 후 6개월 차에 두 그룹 모두 유의적으로 감소하였다. 당화혈색소 역시 두 그룹 모두 수술 전에 비해 수술 후 6개월 차에 유의적으로 감소하였다. 중성지방은 수술 전에 두 그룹 모두 정상범위 이상이었으나 수술 후 6개월 차에 정상범위 수준으로 감소되었고 수술 전에 비해 수술 후 6개월 차에 유의적으로 감소하였다. 본 연구를 통해 고도비만환자들이 베리아트릭 수술 시행 전에 가지고 있던 인류 통계학적 특성, 식습관, 비만 관련 합병증과 보유 증상, 비수술적 요법의 시행 여부 등을 알 수 있었다. 또한 이를 기초 자료로 한 베리아트릭 수술 후 장기적인 영양교육을 실시하는 것이 체중과 체지방량의 감소에 영향을 미치는 것을 확인하였다. 이는 고도비만 환자의 베리아트릭 수술로 인한 체중과 체지방의 감소 효과를 지속적으로 유지하기 위해서는 장기적인 영양교육이 필요함을 보여준다. 향후 연구 대상자의 특징을 고려하여 개별적인 영양교육을 통해 비만 수술 후 전향적인 중재를 시행하여 혈압, 비만 관련 합병증과 보유 증상, 식습관 및 건강 관련 생활습관의 변화에 대한 조사와 영양교육 방법에 대한 실제적 효과를 판정하는 연구가 필요한 것으로 사료된다.

• Journal of Yeungnam Medical Science
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• 제22권1호
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• pp.96-103
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• 2005

뇌성마비로 인해 오른 손에서 단부전마비를 호소하는 환자를 대상으로 기능적 자기공명영상 장치와 경두개 자기 자극기를 사용하여 운동신경의 회복기전을 연구하였다. 대상자는 21세 된 남자 환자로 오른손에 경미한 운동 기능의 손상을 보였고, 자기공명영상의 소견에서 좌반구의 precentral knob에서 병변을 보였다. 기능적 자기공명영상 촬영은 한 명의 대상자와 여덟 명의 정상인을 대상으로 표준화된 헤드코일을 사용하여 1.5 T의 장치에서 BOLD 기술을 적용하여 실시하였다. 대상자들의 운동 수행은 1 Hz 주기로 손가락의 굴곡과 신전을 반복하는 과제가 제시되었다. 경두개 자기 자극은 원형 코일을 사용하여 코일의 앞쪽 부분이 대상자의 두피에서 1 cm 정도 떨어진 정접 부위에 적용되었고 양측의 짧은엄지벌림근에서 발생된 운동 유발 전위가 동시에 측정되었다. 자기공명영상의 결과에서 환자의 비손상측(좌측) 손과 정상군의 좌측 손의 운동 수행 시 오른쪽의 일차운동감각영역(SM1)의 precentral knob에서 활성도가 나타났다, 그러나, 환자의 손상측(우측) 손의 운동 수행 시, 좌측 일차운동감각영역의 손상된 precentral knob 내측 부위에서 활성도를 보였다. 또한, 경두개 자기 자극의 결과에서 손상측 짧은엄지벌림근에서 발생된 운동 유발 전위에 해당하는 뇌 부위가 환자의 정상측과 비교하여 1 cm 내측에서 발견되었다. 그러므로 손상측 손의 운동 기능이 손상된 precentral knob의 내측 부분으로 전위되어 신경재구성이 이루어진 것으로 추정되는 결론을 얻었다.

• Tuberculosis and Respiratory Diseases
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• 제61권3호
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• pp.233-238
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• 2006

배 경: 근치적 항결핵제의 유용에도 불구하고, 결핵으로 사망하는 환자는 증가하고 있다. 다제내성결핵과 HIV 감염이 높은 사망률과 관련되어 있지만, HIV 감염률이 낮은 지역에서는 다른 요소들이 사망과 관련되어 있을 가능성이 있다. 이에 결핵으로 입원한 환자에서 병원내 사망과 관련된 인자들을 알아보고자 하였다. 방 법: 2003년 1월 1일부터 2004년 12월 31일까지 한림대학교 병원에 결핵으로 확진되어 치료한 신환에서 사망한 환자 27명과 호전되어 퇴원한 환자 중 나이와 성별을 짝지은 54명을 대조군으로 비교분석하였다. 결 과: 사망군의 평균 나이는 $60{\pm}16$세이며, 남자가 70%였다. 대조군에 비해 사망군에서 혈색소, 알부민과 콜레스테롤이 유의하게 낮았으며(p <0.05), 혈액요소질소, AST, C-reactive protein는 유의하게 높았다(p <0.05). 사망군에서 대조군에 비해 결핵의 기왕력은 차이가 없었으며, 방사선학적 중증도, 동반질환, 내원시 호흡곤란, 응급실을 통한 입원과 초기 중환자실 치료가 유의하게 높았다(p <0.05). 다중회귀분석을 통해 알부민과 초기 중환자실 치료가 독립적으로 사망에 영향을 미치는 인자로 밝혀졌다(p <0.05). 결 론: 심한 영양결핍을 동반한 중증 결핵 환자는 사망에 고위험군으로 결핵 환자의 조기 발견 및 치료에 개선이 필요하며, 효율적인 공공 보건 교육, 검진정책과 환자관리가 중요할 것으로 사료된다.