A simple approach to estimate the mechanical properties of collagen-like microfibrils surrounded by water

Young-june Yoon,Cheol-soo Bae,Ho-sik Park 한국멀티미디어학회 2010 한국멀티미디어학회 국제학술대회 Vol.2010 No.-

The effective Young's modulus of a microfibril surrounded by water may be simply calculated by using the upper (Voigt) and lower (Reuss) bounds. The result is compared to the Young's modulus estimated by using the Steered Molecular Dynamics (SMD) (Zhang et al. 2007). Our result shows 9.2% difference from the result estimated by SMD, but the steps using these bounds are much simpler than SMD..

급성 골수성 백혈병 환자에서 발생한 침습성 아스페르길루스중에 대한 수술적치료 1 예

배영환;어원식;어상민;김승만 김태영;박수영;서영경;정은주;안효정 인제대학교 2011 仁濟醫學 Vol.32 No.-

Invasive pulmonary aspergillosis is known to have a poor prognosis and major cause of morbidity and motality in patients with hematologic disease. Without adequate therapy, invasive pulmonary aspergillosis will almost always progress to fatal pneumonia. Early administration of antifungal agents in patient with invasive pulmonary aspergillosis is most important. And surgical resection of aspergillous-infected tissue may be useful in patients with lesions that are contiguous with great vessel and lesions causing hemoptysis. We reported a rare case of surgical resection as curative treatment for invasive pulmonary aspergillosis patient in 58-year-old man who had the history of acute myeloid leukemia.

고등학교 운동선수에서 최대하 Treadmill 운동시 심폐기능의 변화와 산소섭취량의 추산법

배옥석,김형진,박재식,주영은 慶北大學校 醫科大學 1990 慶北醫大誌 Vol.31 No.3

고등학교 운동선수에서 최대하 treadmill 운동시험시 심폐기능의 변화를 구명하고 운동부하, 운동시간 및 심박수로부터 산소섭취량을 추산할 수 있는 회귀방정식을 유도하고자 15∼18세의 남자 고등학생 운동선수 14명과 비운동선수 16명을 대상으로 하여 Bruce법에 따라 treadmill 상에서 최대 운동능력의 80%에 해당하는 최대하운동을 실시하고 운동전, 운동중 및 운동후에 심박수, 혈압, 분시환기량, 탄산가스생산량 및 산소섭취량을 측정하였으며 운동 전후에 폐환기역학 검사를 시행하였다. 심박수는 선수군에서 안정시의 71.9±1.3회로부터 운동중 178.0±2.0회까지 증가하여 최대심박수의 81.2±2.3%에 달하였고 비선수군에서는 안정시의 81.8±2.4회로부터 182.6±1.1회까지 증가하여 최대심박수의 79.6±2.0%에 달하였다. 선수군의 심박수는 비선수군에 비해 전 실험기간에 걸쳐 유의(P<0.01)하게 낮은 값을 유지하였다. 분시환기량은 선수군에서 안정시의 5.1±0.6 L/min로부터 운동중 63.0 L/min까지 증가하였고 비선수군에서는 안정시의 5.2±0.5 L/min로부터 51.2 L/min 까지 증가하였으며 양군 사이에는 유의한 차이가 없었다. 산소섭취량은 선수군에서 안정시 1.0±0.4 ㎖/㎏/min로부터 운동중 32.6 ㎖/㎏/min까지 증가하여 최대산소섭취량의 72.9%에 달했으며 비선수군에서는 안정시 1.4±0.3 ㎖/㎏/min로부터 28.9 ㎖/㎏/min까지 증가하여 최대산소섭취량의 70.3%에 달하였다. 선수군의 산소섭취량은 비선수군에 비해 계속 낮은 경향을 보였다. Treadmill 속도 및 경사도와 산소섭취량 간의 중회귀분석 결과 중상관계수 0.9998로서 높은 상관관계를 나타내었다. Bruce법에 따른 운동시간과 산소섭취량 간의 회귀분석 결과 1차함수 회귀식에 대한 상관계수는 0.999였으나 3차함수 회귀식에 대한 상관계수는 0.99999로서 극히 높은 상관관계를 나타내었다. 심박수와 산소섭취량 간에는 상관계수 0.998 및 0.992로서 대체로 높은 직선적 상관관계를 나타내었다. 폐기능검사 결과 안정시 FVC, FEF_(0.2-1.2L), FEF_25% 및 MVV는 선수군에서 비선수군에 비해 유의(P<0.05)하게 높았다. 운동후 폐기능검사 성적은 비선수군에서는 안정시보다 저하된 경향을 보인데 비해 선수군에서는 향상된 경향을 보였다. The cardiorespiratory function was evaluated during and after a submaximal treadmill exercise and some regression equations were derived for estimation of oxygen uptake from exercise load, exercise time and the heart rate. A total of 30 high school boys, of whom 14 were athletic and 16 non-athletic, performed a submaximal treadmill exercise according to the Bruce protocol to the point when 80% of their maximum exercising capacity were reached. The heart rate, blood pressure, minute ventilation, CO_2 production and O_2 uptake were measured before, during and after exercise, and the pulmonary function test was performed before and after exercise. Heart rate was increased from 71.9±1.3 beats/min at rest to 178.0±2.0 during exercise which was 81.2±2.3% of the maximum heart rate in athletes, and from 81.8±2.4 beats/min at rest to 182.6±1.1 which was 79.6±2.0% of its maximum in non-athletes. Athletes showed significantly (P<0.01) lower heart rate than non-athletes throughout the experimental period. Minute ventilation was increased from 5.1±0.6 L/min at rest to 63.0 in athletes and from 5.2±0.5 L/min to 51.2 in non-athletes. Athletes and non-athletes showed no significant difference. Oxygen uptake was increased from 1.0±0.4 ㎖/㎏/min at rest to 32.6 which was 72.9% of maximum oxygen uptake in athletes, and from 1.4±0.3 ㎖/㎏/min to 28.9 which was 70.3% of the maximum in non-athletes. Athletes showed consistently lower oxygen uptake than non-athletes. Multiple regression analysis between treadmill speed and grade and the oxygen uptake showed a high correlation coefficient of 0.9998. A first order regression analysis between exercise time and oxygen uptake showed a correlation coefficient of 0.999, while a third order regression analysis showed an extremely high correlation coefficient of 0.99999. The heart rate and oxygen uptake showed a linear regression with a reasonably high correlation coefficient of 0.998 and 0.992. The pulmonary function test revealed significantly(P<0.05) higher FVC, FEF_(0.2-1.2L), FEF_25% and MVV at rest in athletes than in non-athletes. After exercise, athletes showed enhanced pulmonary function compared with the resting state while non-athletes showed more or less decreased.

기업의 재무 건전성 예측

배영균,김인식 順天靑巖大學 2000 論文集-順天靑巖大學 Vol.24 No.-

This Paper presents some empirical results of a study predicting corporate failure as evidenced by the event of bankruptcy. There have been a fair number of previous studies in this field of research; Beaver(1966), Altman(1968, 1973, 1976) and Ohlson(1980) etc., This study is similar to the Ohlson' study, in that the methodology is one of maximum likelihood estimation of the so called logit model. The financial data set used from KISFAS during 1992 to 1999. And the data is analized by a statistical package, SPSS. The major findings of the study can be summarized as follows. It was possible to identify four basic factors as being statistically significant in affecting the probability of failure within one year. These are : (i) TLTA, a measure of debt; (ii) NITA, a measure of earnnings; (iii) INTWO, a measure of net income; (iv) CHIN, a measure of net liquidity. The probabilistic model estimated is, P(Y_1=1 | Xi) = F(Xi, β_0) = 1 / (1+e^-xβ) = e^xβ / (1+e^xβ) Where, Xβ = -4.0581 - .0024 SIZE + 1.7574 TLTA + .3058 WCTA - .1386 CLCA + 1.1661 OENEG - .4834 NITA + .1649 FUTL + .4088 INTOW - .0017 CHIN P(Y_i=0 | Xi) = 1 - P(Y_i= | Xi) The model is relatively simple to apply and may be of use in practical applications. A potential disadvantage is that the model does not utilize any market transactions data of firms. One may expect that the predictive power of the model could be enhanced by incorporating such data as stock prices, βcoefficient and excess rate of return.

자동차 수동 트랜스미션 기어의 손상과정 예측

베효준,조연상,김동호,서영백,박흥식 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.2

The wear particles is released from the moving surfaces in gear systems of transmission and its morphology is directly related to the damage and failure to gear systems from which the particles originated. It is the effective method to diagnosis damage process of gear systems of automobile transmission to observe wear particle in gear oil. We tested with new transmission and took out gear oil according to drive distance. To be applied to damage diagnosis of gear system in transmission of automobile, 4 shape parameters of wear particles in gear oil were calculated and wear volume were presumed with the image processing system.

본태성 고혈압에서 염산에포니디핀 (NZ-105, 핀테20정�)의 유효성 및 안전성 : 제3상 다기관 임상시험 The phaseⅢ multicenter open trial

배종화,손일석,강흥선,조정휘,강재헌,김성원,이선영,양윤준,김영식,선우성 대한간질학회 2003 대한간질학회지 Vol.9 No.1

Periotest^ⓡ를 이용한 임프란트지지 보철물의 적합도 평가에 관한 연구

김영민,배정식 전남대학교 치과대학 1998 전남치대논문집 Vol.10 No.1

In this study, the Periotest value was measured with Periotest?? to evaluate precision fit of the 2-unit and 3-unit implant-supported prosthesis by modifying the size and location of ill-fitted conditions. The 2-unit prosthesis was fabricated with the right implant fitted incorrectly and the 3-unit prosthesis with the right and center implant fitted incorrectly. To evaluate the effects of the ill-fitted sizes, 4 groups were divided.: The control group being the accurately fabricated sample group fitted properly. Group 1 was constructed with 40㎛ ill-fitted conditions, group 2 with 70㎛ and group 3 with 100㎛ ill-fitted conditions. The Periotest value was measured at each implant site after tightening 10Ncm. The results was follows: 1. The PTV on the ill-fitted area in the 2-unit implant-supported prosthesis increased as the ill-fitted conditions increased. There was a statistically significant difference among groups (p<0.05). In the same ill-fitted sample, the PTV depending on the measured location demonstrated a statistically significant difference (p<0.05). 2. The PTV on the ill-fitted area of the 3-unit implant-supported with an ill-fitted condition in the right implant increased as the ill-fitted conditions increased. There was a significant difference among groups (p<0.05). In the same ill-fitted sample, the PTV depending on the measured location demonstrated a statistically significant difference (p<0.05). 3. In the 3-unit implant-supported prosthesis with ill fitting conditions in the center implant, the PTV on the ill-fitted area demonstrated a statistically significant difference between the control group, group 1 and group 2 (p<0.05). In the same ill-fitted sample, the PTV depending on the measured location demonstrated significant difference between the gap side and the adjacent side with over 70㎛ ill-fitted conditions (p<0.05). The results suggest that Periotest is a valuable objective method for evaluating the precision fit of an implant superstructure.

부상형 직파육묘방법에서 cell 크기에 따른 dibbling의 깊이가 담배 묘 생육에 미치는 영향

김영신,신주식,백기현,배길관 충북대학교 엽연초연구소 2001 煙草硏究 Vol.18 No.-

The objects of this study were to search ideal dibbling depth and cell size in direct-seeding improved float system. Percentage of dry cell was high in dibbling depth of 0.0mm and 7.5mm in every cell size. Dibbling treatment increased the seed germination rate. Germination power of the 128 cell was high in dibbling depth of 15.0mm or more, and that of the 162 cell and 200 cell was high in the depth of 12.5mm or more. Rate of usable plant of the 128 cell was high in dibbling depth of 15.0mm, and that of the 162 cell and 200 cell was high in the depth of 12.5mm. Compaction and low oxygen levels of media by deeper dibbling depth contribute significantly to spiral root. According to the interacting results of the treatments, dibbling depth of 15mm in 128 cell and that of 12.5mm in 162 cell and 200 cell were recommended to get high seed germination rate and good seedling growth.

두개저 골절 환자의 임상적 고찰

김한식,목진호,이규춘,이영배 동국대학교 경주대학 1997 東國論集 Vol.16 No.2

저자들은 최근 2년간 본원 신경외과에 입원 치료 받았던 두부외상 환자 중 자료 분석이 가능했던 119례의 두 개저부 골절 환자를 대상으로 임상 분석하여 다음과 같은 결론을 얻었다. 두부외상후 두개저 골절의 발생 빈도는 34%로 남녀 발생비는 5 : 1이었고, 활동기 연령인 20∼59세가 70.6%를 차지 하였다. 원인으로는 교통사고가 56.3%로 가장 많고 추락, 산재, 낙상, 구타 순이었으며, 내원당시 환자상태는 경증뇌손상(GCS 13-15)이 64.7%, 중증 뇌손상(3∼8) 21.8%, 중등도 뇌손상(9∼12) 13.5% 순이었고 예후도 GCS가 높을수록 양호하였다. 임상소견은 뇌척수액 비루(43.7%)가 가장 흔하고 비루(31.9%), 안와부 반상출혈(31.1%), 기뇌증(26.1%), 청각소실(18.5%)등이었다. 뇌척수액루의 지속 기간은 87.7%가 7일 이내였고 보존적 치료로 93.9%가 해결되었다. 2∼4주 지속된 경우는 요추천자 배액술, 4주 이상된 경우는 수술을 시행하였다. 뇌신경 손상은 안면신경마비가 31.7%로 가장 높았고 발현 시기는 지연성 마비가 69.2%, 조기마비가 30.8%였다. 뇌막염의 발생 빈도는 5.9%로 모두 뇌척수액루가 1주 이상 지속된 경우였고, 항생제 투여군과 비투여군의 뇌막염 발생율은 각각 6.1%와 4.8%로 항생제가 감염율을 낮추지는 못했다. 119 consecutive cases with basal skull fractures out of 343 head injuried patients who were treated in Pohang Hospital from July 1995 to July 1997 were analysed. The authors reviewed the clinical features, radiologic findings, complications and outcomes. Most of the patients(70.6%) were between 20 and 59 years old. The basal skull fractures were more common in men than women-the ratio being 5 : 1. The cause of BSF were traffic accident(56.3%), fall down, work related, silp down, and assults in decreasing order of frequency. The outcome of treatment wee related to initial GCS(Glasgow coma scale) of patients. The severity of head injury were mild(GCS13-15)-64.7%, Moderate(GCS9-12)-13.5%, and severe(GCS3-8)-21.8%, The most common feature of BSF were rhinorrhea(43.7%), otorrhea(31.3%), raccoon's eye(31.1%), pneumocephalus(26.1%), hearing disturbance(18.5%). Most of CSF leakage(86.7%) were noted within 24hours after injury and most of leakage(93.9%) were ceased by conservative management within 2 weeks, but one case that did not respond to conservative and lumbar drainage required operative repair. The facial nerve(31.7%) was the most frequently involved cranial nerve followed by vestibulocochlear and optic nerve. The onset of facial palsies were immediate in 30.8% and delayed 69.2%. The incidence of meningitis was 5.9% and the prophylactic antibiotics had no beneficial effect in reducing the infection rate.

Behavioural Semantics를 추가한 Database Transactions의 Modelling 및 Design

박영배,김광식 명지대학교 공학기술연구소 1986 공학기술연구소 논문집 Vol.1 No.-

Designing DB, in the conventional relational/network DBMS, the DB designer doesn't deal with behavioural aspect, but only with structural aspect. And semantic integrity control is needed for the relational/network DBMS based on extended E-R model for representing semantics of real world precisely. In this paper, defining the structure of extended E-R model and semantic integrity rules on this structure, Dynamic Operation has been designed by analyzing behaviour for maintaining the semantic integrity rules in the relational/network DBMS. Also, proposing the modelling technique of transaction to represent the behaviour of objects in this structure, we have designed the transaction using transaction scheme which is the result of modelling.