흰쥐 복직근과 대흉근 근섬유 유형에 대한 조직화학적 연구

민병운,박경수,노영복 조선대학교 기초과학연구소 1989 自然科學硏究 Vol.12 No.1

포유동물인 흰쥐의 대흉근과 복직근에 대한 근섬유 특성 및 근섬유 유형별 빈도를 조사하기 위하여 1988년 7월 2일~1988년 10월7일 조직화학적 및 각종 효소조직화학적 염색을 시행하여 조사한 바 다음과 같은 결론을 얻었다. 1. H-E 염색에 의한 근섬유의 유형별 구분은 불 명확하였으나, PAS 염색에서는 양성 반응의 정도에 따라서 세가지 유형으로 구분되었다. 2. Reversed myosin-ATP ase 염색과 SDH염색에서는 TypeⅠ, Ⅱa, Ⅱb의 세가지 유형의 근섬유형이 구분되었다. 그러나 typeⅡ와 Ⅱb의 유형별 빈도는 SDH염색과 Reversed myosin-ATP ase 염색상 상당한 차이가 있는 것으로 관찰되었다. 3. 포유동물인 흰쥐의 복직근과 대흉근의 근 섬유형 구성비는 부위에 따라서 상당한 차이가 있었다. In order to study properties and individual proportions of muscle fiber types on the pectoralis major an rectus abdominis muscle of the rat, vertebrates, histological and each kinds of enzyme histochemical stain (were performed). The following results were obtained : 1. Differentiation of muscle fiber types was not evident in H & E stained specimen. However, three types of muscle fibers were evidently differentiated in PAS stained sections according to the degree of positivity. 2. Muscle fiber of three types (typeⅠ, Ⅱa and Ⅱb) were differentiated in reversed-ATP ase and SDH stain. However, there were considerable difference between SDH and reversed-ATP ase stain properties in proportion of typeⅡa and Ⅱb. 3. The constituent proportions of muscle fibers in rectus abdominis and pectoralis major muscle of the rat were remarkably different according to the portions.

기본 모드에서 동작하는 비동기 순차 회로의 시험 벡터 생성

趙庚衍,李宰勳,閔炯福 성균관대학교 1998 학술회의지원논문목록집 Vol.1998 No.-

비동기 순차 회로에 대한 시험 벡터를 생성하는 문제는 매우 어려운 문제로 남아 있다. 현재까지 이 문제 에 대한 알고리즘은 거의 없었다. 그리고, 기존의 접근 방식은 시험 벡터를 생성하는 동안에는 피이드백 루프를 절단하여 그 곳에 플립플롭이 있는 것처럼 가정하고 시험 벡터를 생성하는 방식이었다. 그래서, 기존의 알고리즘은 동기 순차 회로용 시험 벡터 생성 알고리즘과 매우 유사하였다. 이것은 시험 벡터를 생성할 때에는 비동기 순차회로를 동기 순차 회로로 가정하고 시험 벡터를 생성한다는 것을 의미한다. 그러므로, 생성된 시험 벡터가 비동기 순차 회로에 적용되었을 때, 대상 결함을 검출하지 못할 수도 있다는 것을 나타낸다. 본 논문에서는 비동기 순차 회로에 대한 시험 벡터를 생성할 수 있는 알고리즘을 제시하였다. 본 논문에서 제안된 알고리즘을 적용하여 생성된 시험 벡터는 임계레이스(critical race) 문제와 순환(oscillation) 문제의 발생을 최소로 하면서 비동기 순차 회로의 결함을 검출할 수 있다. 그리고, 본 논문에서 제안된 알고리즘을 적용하여 생성된 시험 벡터는 비동기 순차 회로에 대해서 대상 결함을 검출하는 것이 보장된다. Generating test patterns for asynchronous sequential circuits remains to be a very difficult problem. There are few algorithms for this problem, and previous works cut feedback loops, and insert synchronous flip-flops in the feedback loops during ATPG. The conventional algorithms are similar to the algorithms for synchronous sequential circuits. This means that the conventional algorithms generate test patterns by modeling asynchronous sequential circuits as synchronous sequential circuits. So, test patterns generated by those algorithms may not detect target faults when the test patterns are applied to the asynchronous sequential circuit under test. In this paper an algorithm is presented to generate test patterns for asynchronous squential circuits. Test patterns generated by the algorithm can detect tasget faults for asynchronous sequential circuits with the minimal possibility of critical race problem and oscillation. And it is guaranteed that the test patterns generated by the algorithm will detect taraet faults.

위치 기반 서비스에서 미래 위치 검색을 위한 이동 객체 색인

서동민,복경수,유재수 충북대학교 컴퓨터정보통신 연구소 2004 컴퓨터정보통신연구 Vol.12 No.1

최근 위치 기반 기술에 대한 활용이 증가하면서 이동 객체를 효율적으로 관리하기 위한 색인 구조의 필요성이 증가하고 있다. 하지만, 기존에 제안된 색인 구조들은 이동 객체의 계속되는 위치 이동으로 빈번한 색인의 변경과 성능 저하 문제를 가진다. 본 논문에서는 미래 위치 검색 및 갱신 비용을 최소화하기 위한 새로운 시공간 색인 구조를 제안한다. 제안하는 색인 구조는 갱신 비용을 최소화하기 위해 이동 객체의 현재 위치를 직접 접근하기 위한 보조 색인 구조와 공간 분할 기반의 KDB-트리를 결합한 색인 구조이다. 제안하는 색인 구조에서는 이동 객체의 미래 위치 검색 및 갱신 비용을 줄이기 위해 KDB-트리의 중간 노드에 시간에 대한 파라미터를 유지한다. 또한 제안하는 색인 구조에서는 공간활용도 및 검색 효율을 극대화하기 위한 새로운 갱신 및 분할 기법을 제안한다. 제안하는 색인 구조의 우수성을 입증하기 위해 다양한 실험을 통해 성능 평가를 수행한다. Recently, with the rapid development of location-based techniques, index structures to efficiently manage moving objects have been required. Existing index structure frequently need updates because moving objects change continuatively its position. That caused entire performance loss of index structure. In this paper, we propose a new spatio-temporal index structure that supports a future position retrieval and minimizes a update cost. The proposed index structure combines an assistant index structure that directly accesses current positions of moving objects with KDB-tree that is a space partitioning access method. The internal node in our proposed index structure keeps time parameters in order to support the future position retrieval and to minimize a update cost. Moreover, we propose new update and split methods to maximize the space utilization and the search performance. We perform various experiments to show that our proposed index structure outperforms the existing index structure.

Accident risk associated with smartphone addiction: A study on university students in Korea

Kim, Hye-Jin,Min, Jin-Young,Kim, Hyun-Jin,Min, Kyoung-Bok Akadémiai Kiadó 2017 JOURNAL OF BEHAVIOURAL ADDICTIONS Vol.6 No.4

<P><B>Background and aims</B></P><P>The smartphone is one of the most popular devices, with the average smartphone usage at 162 min/day and the average length of phone usage at 15.79 hr/week. Although significant concerns have been made about the health effects of smartphone addiction, the relationship between smartphone addiction and accidents has rarely been studied. We examined the association between smartphone addiction and accidents among South Korean university students.</P><P><B>Methods</B></P><P>A total of 608 college students completed an online survey that included their experience of accidents (total number; traffic accidents; falls/slips; bumps/collisions; being trapped in the subway, impalement, cuts, and exit wounds; and burns or electric shocks), their use of smartphone, the type of smartphone content they most frequently used, and other variables of interests. Smartphone addiction was estimated using Smartphone Addiction Proneness Scale, a standardized measure developed by the National Institution in Korea.</P><P><B>Results</B></P><P>Compared with normal users, participants who were addicted to smartphones were more likely to have experienced any accidents (OR = 1.90, 95% CI: 1.26–2.86), falling from height/slipping (OR = 2.08, 95% CI: 1.10–3.91), and bumps/collisions (OR = 1.83, 95% CI: 1.16–2.87). The proportion of participants who used their smartphones mainly for entertainment was significantly high in both the accident (38.76%) and smartphone addiction (36.40%) groups.</P><P><B>Discussion and conclusions</B></P><P>We suggest that smartphone addiction was significantly associated with total accident, falling/slipping, and bumps/collisions. This finding highlighted the need for increased awareness of the risk of accidents with smartphone addiction.</P>

스캔 설계 법칙 검사에 관한 연구

이재훈,김형국,조경연,임동욱,민형복 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.2

Since testing of digital circuit is becoming increasingly important, many methodologies have been introduced to enhance design for testability (DFT). DFT was taken into account in the automated test procedure and improved reliability of the design. Both tasks are well suited for scan rule checker. This paper presents a scan rule checker for gate level digital circuits. The scan rule checker deals with basic rule check, basic scan rule check, muxed scan rule check, clocked scan rule check and lssd. Scan design informations were represented in the configuration file and libraries were modeled for the scan rule checker. It is an efficient way for the design for testability methodology.

한 자동차 회사의 남성 사무직 근로자에서 직무스트레스와 우울, 불안 및 스트레스 증상과의 관련성

박규철,이경종,박재범,민경복,이규원 大韓産業醫學會 2008 대한직업환경의학회지 Vol.20 No.3

목적: 직무스트레스와 관련성이 있는 우울증,불안 장애 등의 정신과적 질병이 증가하고 있는 상황에서 한 자동차 회사의 남성 사무직 근로자를 대상으로 우울,불안 및 스트레스 증상의 수준을 파악하고 직무스트레스와 우울,불안,스트레스 증상과의 관련성을 살펴보고자 하였다. 방법: 연구 대상자 286명을 설문조사하였다. 직무스트레스 수준과 우울,불안,스트레스 증상을 평가하기 위해 한국인 직무스트레스 측정도구(Korean Occupational Stress Scale; KOSS)와 우울,불안,스트레스 측정도구(Depression Anxiety Stress Scale; DASS)를 사용 하였다. 설문지의 신뢰도와 타당도를 평가하였고 로지스틱 회귀분석을 시행하여 한국인 직무스트레스 측정도구의 8개 영역에 걸쳐 우울,불안 및 스트레스 증상과의 관련성을 살펴보았다. 결과: 연구 대상자에서 우울,불안 및 스트레스 증상이 있는 경우는 각각 57.7%,37.7%, 42.2%였으며,심각 하거나 매우 심각한 우울,불안 및 스트레스 증상을 보이는 경우도 각각 19.6%, 4.8%,8.0%로 조사되었다. 직무스트레스의 총점수가 높은 군에서 우울,불안 및 스트 레스 증상의 발생 비차비는 각각 4.93(95% C.I. = 2.38∼10.24),2.70(95% C.I.=1.58∼5.11). 3.53 (95% C.I.=1.90∼6.56)이었다. 직무스트레스 요인 중 조직체계가 우울 증상의 발생과 관련성이 가장 높았으며 (OR=4.83, 95% C.I.=2.43∼9.58), 직무요구도는 불안 및 스트레스 증상의 발생과 관련성이 높았다(OR=3.21, 95% C.I.=1.77-5.85; OR=4.66, 95% C.I.=2.53∼8.58). 결론: 자동차 회사의 남성 사무직 근로자에서 직무스트레스가 높은 군이 낮은 군에 비해서 우울,불안 및 스트레스 증상이 발생하는 경우가 많았다. 직무요구도와 조직 체계에 대한 개선을 통해 우울,불안 및 스트레스 증상의 발생을 감소시킬 필요가 있다. Objectives: To investigate the relationship between occupational stress and depression, anxiety, and stress symptoms among white-collar male workers in an automotive company. Methods: A cross-sectional study involving 286 white-collar male workers was conducted with the Korean Occupational Stress Scales (KOSS) and Depression Anxiety Stress Scales (DASS) questionnaire. Results: According to the DASS cut-off value (≥78 percentile scores), the prevalence of depression, anxiety and stress system was 57.7%, 37.7% and 42.2%, respectively. By logistic regression analysis, organizational system was the factor most strongly associated with depression (OR=4.83, 95% C.I.=2.43-9.58), while job demand was strongly associated with anxiety (OR=3.21, 95% C.I.= 1.77-5.85) and stress (OR=4.66, 95% C.I.=2.53-8.58). Conclusions: Occupational stress was positively associated with depression, anxiety, and stress symptoms among white-collar male workers in an automotive company. A prospective study is warranted to delineate the causal relationships between job stress and psychiatric disorders.

Exposure to environmental noise and risk for male infertility: A population-based cohort study

Min, Kyoung-Bok,Min, Jin-Young Elsevier 2017 Environmental pollution Vol.226 No.-

<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Noise is associated with poor reproductive health. A number of animal studies have suggested the possible effects of exposure to high noise levels on fertility; to date, a little such research has been performed on humans.</P> <P><B>Objectives</B></P> <P>We examined an association between daytime and nocturnal noise exposures over four years (2002–2005) and subsequent male infertility.</P> <P><B>Methods</B></P> <P>We used the National Health Insurance Service-National Sample Cohort (2002–2013), a population-wide health insurance claims dataset. A total of 206,492 males of reproductive age (20–59 years) with no history of congenital malformations were followed up for an 8-year period (2006–2013). Male infertility was defined as per ICD-10 code N46. Data on noise exposure was obtained from the National Noise Information System. Exposure levels of daytime and night time noise were extrapolated using geographic information systems and collated with the subjects' administrative district code, and individual exposure levels assigned.</P> <P><B>Results</B></P> <P>During the study period, 3293 (1.6%) had a diagnosis of infertility. Although there was no association of infertility with 1-dB increments in noise exposure, a non-linear dose-response relationship was observed between infertility and quartiles of daytime and night time noise after adjustment for confounding variables (i.e., age, income, residential area, exercise, smoking, alcohol drinking, blood sugar, body mass index, medical histories, and particulate pollution). Based on WHO criteria, adjusted odds for infertility were significantly increased (OR = 1.14; 95% CI, 1.05–1.23) in males exposed to night time noise ≥ 55 dB.</P> <P><B>Conclusion</B></P> <P>We found a significant association between exposure to environmental noise for four years and the subsequent incidence of male infertility, suggesting long-term exposure to noise has a role in pathogenesis of male infertility.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Noise is widespread and imposes auditory and non-auditory health consequences. </LI> <LI> We investigated the risk of male infertility on exposure to Environmental noise. </LI> <LI> Male infertility was significantly associated with daytime and nocturnal noise. </LI> <LI> The risk was significantly increased at the WHO night noise criteria (≥55 dB). </LI> <LI> Exposure to noise may be contributed to a risk for male reproduction. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Reduced lung function, C-reactive protein, and increased risk of cardiovascular mortality.

Min, Kyoung-Bok,Min, Jin-Young Japanese Circulation Society 2014 CIRCULATION JOURNAL Vol.78 No.9

<P>We explored whether reduced lung function is a predictor of mortality due to cardiovascular or coronary artery disease (CVD or CAD), and, if this hypothesis is correct, whether C-reactive protein (CRP), a systemic inflammatory marker, is responsible for this association in a general population-based cohort. METHODS???AND???RESULTS: We used the Third Nutrition and Health Examination Survey (NHANES III) database and the NHANES III Linked Mortality File. A total of 13,310 participants ???20 years of age who completed a spirometric test at baseline examination were included. On comparison of the participants in the lowest forced vital capacity percent predicted (FVC% pred) quartile with those in the highest quartile, the hazard ratio (HR) was 2.1 (95% CI: 1.7-2.6) for cardiovascular mortality and 2.2 (95% CI: 1.6-3.2) for coronary mortality. A similar association was observed for forced expiratory volume in 1 s percent predicted (FEV1% pred). When the participants with the highest FVC% pred or FEV1% pred (Q4) and low CRP (???0.22 mg/dl) were defined as the reference group, the adjusted HR for cardiovascular mortality was significantly increased in the individuals with the lowest spirometric volume (Q1), and the risk was prominent in individuals with high CRP (>0.22 mg/dl).</P>

Serum carotenoid levels and risk of lung cancer death in US adults

Min, Kyoung-bok,Min, Jin-young BlackWell Publishing Ltd 2014 CANCER SCIENCE Vol.105 No.6

<P>Lung cancer is one of the most common cancers worldwide and is the leading cause of cancer-induced death in the USA. Although much attention has been focused on the anti-carcinogenic effect of consuming carotenoid-containing food or supplements, the results have been inconsistent. We investigated whether serum carotenoid levels were associated with the mortality risk of lung cancer in US adults using data from a nationally representative sample. The data were obtained from the Third Nutrition and Health Examination Survey (NHANES III) database and the NHANES III Linked Mortality File. A total of 10 382 participants aged over 20 years with available serum carotenoid levels and no other missing information on questionnaires and biomarkers at baseline (NHANES III) were included in the present study. Of the 10 382 participants, 161 subjects died due to lung cancer. We found that high serum levels of alpha-carotene and beta-cryptoxanthin at baseline were significantly associated with a lower risk of lung cancer death. When we stratified the risk by current smoking status, the risk of death of current smokers was significantly decreased to 46% (95% confidence interval, 31–94%) for alpha-carotene and 61% (95% confidence interval, 19–80%) for beta-cryptoxanthin. By contrast, no association was observed among never/former smokers at baseline. High serum levels of alpha-carotene and beta-cryptoxanthin are associated with a lower risk of lung cancer death in US adults.</P>

A study on the association between hazardous alcohol drinking and health problems in workers

Kyoung-Bok Min(민경복),Kyung-Jong Lee,Jae-Beom Park 대한직업환경의학회 2009 대한직업환경의학회 학술대회 논문집 Vol.43 No.-