음향방출을 이용한 금속의 피로 균열성장 패턴인식 기법

이수일(Soo Ill Lee),이종석(Jong-Seok Lee),민황기(Hwang-Ki Min),박철훈(Cheol Hoon Park) 대한전자공학회 2009 電子工學會論文誌-SP (Signal processing) Vol.46 No.3

음향방출 기법은 작동중인 상태에서 기계 설비를 비파괴 검사할 수 있는 기법이며, 균열성장 같은 장애의 신뢰성 있는 감시를 위해서 순간적인 균열신호뿐만 아니라 동특성을 이용하는 것이 중요하다. 균열성장을 검출하기 위해 널리 사용되는 물리적 파괴 3단계는 음향방출 현상이 시간에 따라 서로 겹치는 문제점이 있어 정확한 균열성장 시간을 추정하기 어렵다. 제안한 패턴인식 기법은 오경보와 미탐지를 최소화하기 위해서 음향방출 동특성을 입력으로 사용하고, 균열성장 시간을 정확히 추정하기 위해 시간에 따른 클러스터링 기법을 사용한다. 실험결과는 제안한 패턴인식 기법이 압력의 변화에 의한 음향방출의 변화의 강인함 때문에 실용화에 효율적임을 보여준다. Acoustic emission-based techniques are being used for the nondestructive inspection of mechanical systems used in service. For reliable fault monitoring related to the crack growth, it is important to identify the dynamical characteristics as well as transient crack-related signals. Widely used methods which are based on physical phenomena of the three damage stages for detecting the crack growth have a problem that crack-related acoustic emission activities overlap in time, therefore it is insufficient to estimate the exact crack growth time. The proposed pattern recognition method uses the dynamical characteristics of acoustic emission as inputs for minimizing false alarms and miss alarms and performs the temporal clustering to estimate the crack growth time accurately. Experimental results show that the proposed method is effective for practical use because of its robustness to changes of acoustic emission caused by changes of pressure levels.

부산지역 거주 노인의 인지기능장애 및 치매 유병률

김정순,이수일,정영인,황인경,이봉숙,김민정,초의수,전진호,정인숙,Kim, Jung-Soon,Lee, Su-Ill,Chung, Young-In,Hwang, In-Kyung,Yih, Bong-Sook,Kim, Min-Jeong,Cho, Eu-Soo,Chun, Jin-Ho,Jeong, Ihn-Sook 대한예방의학회 2003 예방의학회지 Vol.36 No.1

Objectives : To investigate the prevalence of cognitive impairment and dementia in elderly people, aged 65 or above, residing in Busan Metropolitan City. Methods : Total of 1,101 old people, aged 65 or above, living in Busan as of December 31, 2001 were selected using stratified three-stage cluster sampling. Cognitive impairment was determined from the MMSE-K score, and dementia confirmed from five psychometric measures and the Barthel index. The crude prevalence, sex-age adjusted for the Korean population, were obtained. Results : With the cut-off point for cognitive impairment was set at 24 points, or below, on the MMSE-K scale, the crude rate of cognitive impairment was 29.3% (15.7% for men and 37.5% for women), and the sex-age adjusted prevalence was 30.5% (17.5% for men and 37.0% for women). When the cut-off point for cognitive impairment was set at 20 points, or below, on the MMSE-K scale, the crude rate of cognitive impairments were 10.0% (4.1% for men and 13.5% for women), and 10.6% (4.7% for men and 13.1% for women), respectively. The crude dementia, and the sex-age adjusted rates were 7.4% (2.4% for men and 10.5% for women), and 8.0% (2.7% for men and 10.0% for women), respectively. Conclusions : The prevalence of dementia in this study was somewhat lower than that reported by other domestic and foreign studies. Our results related to the difference in time and space, diagnostic tools, response rates, and distribution of male and female subjects, etc.

젊은 성인 남자 근로자들에 있어서 음주, 흡연, 비만도와 혈중 지질과의 관련성에 관한 조사 연구

이지호,조병만,이수일,김돈균,Lee, Ji-Ho,Cho, Byung-Mann,Lee, Soo-Ill,Kim, Don-Kyoun 대한예방의학회 1992 예방의학회지 Vol.25 No.4

In order to study the relationship between life-style and serum lipids level in young adults, the author measured the concentration of serum total cholesterol (TC), triglyceride (TG) and high density lipoprotein cholesterol (HDL-C) and investigated age, relative weight, weekly alcohol intake and daily cigarette smoking through questionnaire in 310 male workers aged 20 to 39, in Ulsan area. The results obtained were as follows: 1. In the factors being able to influence serum lipids level there was negative correlation between age and alcohol intake, and the positive correlation between age and relative weight, alcohol intake and relative weight, alcohol intake and smoking with the strongest correlation between alcohol intake and smoking. 2. In univariate analysis, mean total cholesterol concentration were significantly different according to age, smoking and relative weight: mean triglyceride concentration were significantly different according to relative weight only; mean HCL-C concentration were significantly different according to alcohol intake alone. 3. In non-drinkers, HDL-C concentration of smokers were significantly lower than that of non-smokers but triglyceride concentration of smokers were significant higher. And in drinkers, total cholesterol concentration of smokers was significantly higher than that of non-smokers. 4. In multiple regression analysis, significant independent variables were relative weight, age and smoking in the total cholesterol concentration, and relative weight, age and alcohol intake in the triglyceride concentration, and alcohol intake, relative weight and smoking in the HDL-C concentration. By these independent variables, total variation in each dependent variable was explained 7.9%, 17.6% and 7.4% respectively.

부산지역 일부 소아의 혈청 지질 분포에 관한 연구

강수용,조병만,이수일,황인경,김영욱,김영실,차애리,하이호,이철호,김돈균,Kang, Soo-Yong,Cho, Byung-Mann,Lee, Su-Ill,Hwang, In-Kyong,Kim, Yeung-Wook,Kim, Young-Sil,Cha, Ae-Ri,Ha, I-Ho,Lee, Chel-Ho,Kim, Don-Kyoun 대한예방의학회 1997 Journal of Preventive Medicine and Public Health Vol.30 No.4

This is a cross-sectional study to evaluate the serum lipid levels of children living in Pusan in 1996. The distribution of age is from 2 years old to 12 years old. In female children mean total cholesterol is $171.4{\pm}26.2mg/dl$, triglyceride is $104.7{\pm}50.6mg/dl$, HDL-cholesterol is $54.4{\pm}14.8mg/dl$, and LDL-cholesterol is $95.4{\pm}32.9mg/dl$. In male children mean total cholesterol is $167.9{\pm}25.2mg/dl$, triglyceride is $6{\pm}45.5mg/dl$, HDL-cholesterol is $55.4{\pm}11.7mg/dl$, and LDL-cholesterol is $94.4{\pm}23.6mg/dl$. The percentile of serum lipid levels is measured in children. The 95th percentile of serum total cholesterol is 210mg/d1 in male children, and 214mg/d1 in female children. And, the 95th percentile of serum triglyceride is 184mg/d1 in male children, and 191mg/d1 in female children. And, the 95th percentile of LDL-cholesterol is 133mg/d1 in male children, and 135mg/d1 in female children. Serum total cholesterol is positively .Elated to age(r=0.18), height(r=0.08), weight (r=0.17), obesity index(r=0.12), and negatively .elated to father's education level (r=-0.13), mother's education level(r=-0.13). Serum triglyceride is positively related to weight(r=0.23), age(r=0.31) and negatively .elated to father's education level(r=-0.12), mother's education level(r=-0.18). Serum HDL-C was positively reated to mother's education level(r=0.07) and negatively .elated to height(r=-0.12), weight(r=-0.09). Conclusively, the serum lipid levels of children living in Pusan is generally so high that the family and school must try to control the serum lipid levels. 본 연구는 부산지역 소아의 연령별 혈청지질치의 분포와 이에 영향을 미치는 요인에 대한 단면조사연구로서 1996년 4월에 2세부터 12세의 941명을 대상으로 혈청 지질을 조사한 결과는 다음과 같다. 1. 평균 혈청지질치 혈청지질치는 여아의 경우 총콜레스테롤 $171.4{\pm}26.2mg/dl$, 중성지방 $104.7{\pm}50.6mg/dl,\;LDL-C\;95.4{\pm}32.9mg/dl$로 남아의 $167.9{\pm}25.2mg/dl,\;90.6{\pm}45.5mg/dl,\;94.4{\pm}23.6mg/dl$보다 높았다. 총콜레스테롤 (p<0.05)과 중성지방(p<0.01)에서는 여아에서 통계적으로 유의하게 높았다. HDL-C은 남아가 $55.4{\pm}11.7mg/dl$로 여아의 $54.4{\pm}14.8mg/dl$보다 높았다. 2. 혈청지질치의 백분위수 소아의 혈청지질치의 백분위수는 총콜레스테롤의 경우 95퍼센타일이 남아에서 210mg/dl, 여아의 경우 214mg/d1로 미국에서 보고된 남아의 191mg/dl과 여아의 209mg/dl보다 오히려 높았다. 3. 혈청 지질과 비만도 경도 비만군과 중등도 비만군이 정상군보다 총콜레스테롤, 중성지방, LDL-C 등에서 의미있게 높았고, HDL-C에서 의미있게 낮았다(p<0.05). 4. 혈청 지질과 부모의 학력 총콜레스테롤, 중성지방, LDL-C은 아버지의 최종학력이 높을수록 의미 있게 감소하였고(p<0.05), 총콜레스테롤, 중성지방, LDL-C은 어머니의 최종학력이 높을수록 의미 있게 감소하였고(p<0.01), HDL-C은 어머니의 최종학력이 높을수록 통계학적으로 의미있게 증가하였다(p<0.05).

부산 일부지역 근로자들의 재해성 요부손상에 대한 사회의학적 조사

박종욱,김돈균,이수일,조병만,조봉수,김영욱,Park, Jong-Ook,Kim, Don-Kyoun,Lee, Su-Ill,Cho, Byung-Mann,Cho, Bong-Soo,Kim, Young-Wook 대한예방의학회 1994 Journal of Preventive Medicine and Public Health Vol.27 No.2

This survey was performed to obtain the basic information for the prevention and management of occupational low back injury (LBI). The subjects of this survey were 952 workers (male, 892 ; female, 60) who had taken occupational LBI in some industries of Pusan area from January 1 to December 31, 1991. Observation period was 2.6 years from the beginning to the end of medical treatment. The obtained results were summarized as follows ; 1. The proportion of LBI workers was 15.9% of the workers who had taken any occpational injuries and 0.32% of all workers in this surveyed area. 2. 8.0% of the workers had taken LBI on the 1st day of employment and 55.2% of the workers were within one year, 91.4% of the workers were within 10 years according to cumulative frequency distribution. 3. Handling of heavy objects was the most common cause of LBI (32.0%) and fall down (26.9%) and slip down (16.3%) were the next in order. 4. The most common causes of both lumbar sprain and HNP were handling of heavy objects and that of lumbar fracture was fall down. 5. The mean duration for medical treatment of LBI workers was 143 days. 6. The total direct compensation cost for LBI workers was 6,736 million Won and the proportion of medical, resting, disability compensation costs were 25.0%, 37.0%, 38.0 % respectively. 7. The percentages of retreated workers and disabled workers were 11.9% (113 persons) and 22.9% (218 persons) of total LBI workers respectively.

일부 도시 영세지역 노인들의 영양상태와 관련인자에 관한 연구

조봉수,김돈균,이수일,조병만,김영욱,고광욱,Cho, Bong-Soo,Kim, Don-Kyoun,Lee, Su-Ill,Cho, Byung-Mann,Kim, Young-Ook,Koh, Kwang-Wook 대한예방의학회 1995 예방의학회지 Vol.28 No.1

부산시 해운대구 반송2동 운봉 영구임대 아파트에 거주하는 60세 이상의 노인 135명 (남자 36명, 여자 99명), 기타 지역에 거주하는 일반가정의 60세 이상 노인 136명(남자 45명, 여자 91명)을 대상으로 1994년 3월부터 8월까지 6개월에 걸쳐 영양섭취 상태 및 관련 요인들을 분석한 결과를 요약하면 다음과 같다. 1. 대상자의 일반특징 두 지역에서 성별 분포와 연령의 평균치에는 차이가 없었으며 소득수준의 경우 유의한 차이가 있어서 대상지역이 영세지역을 나타내고 대조지역이 일반가정을 나타낸다는 가정은 충족되었다. 2. 영양섭취에 관련된 요인 지난 한 해 동안의 입원 여부나 위장관계 질환, 음주, 흡연은 유의한 차이가 없었으나 만성질환, 투약, 비타민제 복용, 건강인식상태 등은 유의한 차이를 보여 일부 요인에 있어 대상지역의 건강관련상태가 더 나쁜 것으로 나타났다. 3. 영양소 섭취 상태 일부 항목은 권장량을 초과하는 것도 있으나 대부분의 영양소는 섭취량이 부족하였고, 더욱이 대조지역과 비교할 때 영양상태가 유의하게 낮아 소득수준을 포함한 경제수준의 차이가 영양상태를 나타낸다는 가설을 증명할 수 있었다. 4. 식생활 관련 지식과 행동 식생활관련 지식의 경우 유의하게 대상지역이 낮았으나 행동의 경우 큰 차이가 없었다. 이는 소득 수준이 행동에 영향을 준다고 가정한 가설에 어긋나는 결과로 교육수준 등 다른 교란변수들이 미치는 영향이 더 큰 것으로 볼 수 있었다. 5. 영양소 섭취에 영향을 미치는 인자 영양소 섭취에 영향을 미치는 주된 인자는 교육과 소득, 식생활 관련 지식이었으며, 대상지역의 경우 식생활 관련 지식이 영양섭취에 영향을 미쳐, 영양상태의 개선을 위해 영세지역의 노인들을 대상으로 한 올바른 식지식에 대한 교육이 필요할 것으로 생각된다. This study was carried out to analyze the food intake and associated factors of the urban poor elderly by comparing poor district, Unbong rental apartment in Bansong 2 dong with other areas in Pusan. 135 elderlies(men 36, women 99) in Unbong rental apartment, 136 elderlies(men 45, women 91) in the other areas were investigated during the period of March to August in 1994. The assumption that the study area represented poor district was satisfied because the age and sex distribution was not significantly different, and the income of the study area was significantly lower than that of the control area. The variables of hospitalized in previous 12 month, gastrointestinal problem, alcohol drinking, cigarette smoking did not differ significantly. But the variables of chronic disease, take medicine, perceived health, vitamin supplement differed significantly between two groups. Therefore some factors associated with health state in the study area are worse than those of the control area. At most of all variables, nutrients intake of the study area did not reach the recommended dietary allowances(RDA) for Koreans, and that nutrient intakes of the study area were significantly lower than those of the control area. The hypothesis of this study that nutrient status depends on economical status was proved. As for the score of nutritional knowledge, the study area was significantly lower than the control area. But as for the score of nutritional behavior, two areas were not significantly different. The latter is counter result of our hypothesis, owing to the effect of the confounding factors including education etc. As for the correlation of variables, not only economic status and educational level, but the score of nutritional knowledge effects strongly on nutrient status in the study area, the poor district. Therefore, adequate nutritional education to the elderly in e poor district should be considered.

가동원전 Wi-Fi 무선통신 사용을 위한 운영 및 관리방안 연구

김용식(Yong-Sik Kim),이수일(Soo-Ill Lee),예송해(Song-Hae Ye) 대한전기학회 2015 정보 및 제어 심포지엄 논문집 Vol.2015 No.4

가동원전 Wi-Fi 무선통신 사용을 위한 운영 및 관리방안 연구

김용식(Yong-Sik Kim),이수일(Soo-Ill Lee),예송해(Song-Hae Ye) 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.4

신형경수로1400 시뮬레이터용 DCS 제어논리화면 개발

예송해(Song Hae Ye),이수일(Soo Ill Lee),신영철(Yeong Cheol Shin) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.10

본 논문은 신형경수로1400(Advanced Power Reactor 1400) 시뮬레이터의 운전원화면(OIS)에 DCS(distributed Control System) 제어논리화면을 모사하는 방법에 대해 설명하고 있다. 이의 모사를 위해 실제로 신고리 3,4호기 원자력발전소에 적용되는 Ovation DCS의 제어로직 도연파일을 시뮬레이터와 연계하여 화면에 직접 표시하는 방법을 제시하고 있다. 이는 실제 발전소에 적용되는 로직을 그대로 표시하여 줌에 따라 운전을 지원한다. 원자력 발전소에 적용 운영중인 제어로직도면 중 운전원이 선택한 특정제어계통의 도면정보에 대한 정적 데이터를 로딩하고, 시뮬레이터의 공정변수에 대한 동적데이터를 연계하여 제어논리화면을 운전원 화면에 보여준다.

양극성 장애 및 주요우울장애의 초발 우울증에 대한 특성 비교

배명옥(Myeong Ok Bae),이병욱(Byung Wook Lee),이수일(Soo Ill Lee) 한국정신병리진단분류학회 1997 精神病理學 Vol.6 No.1

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