모 연취급장 근로자들의 연폭로지표들과 혈압과의 관련성

임상복,김용배,이용진,리갑수,김화성,황규윤,장봉기,이성수,안규동,이병국 순천향대학교 산업의학연구소 1998 순천향산업의학 Vol.4 No.1

In order to investigate the relationship between blood lead with other lead exposure indices and blood pressure in occupationally lead exposed male workers, 629 workers(515 lead exposed workers and 114 non lead exposed workers) in a storage battery factory were studied. Blood lead(PbB), zinc protoporphyrin(ZPP) and urinary δ-aminolevulinic acid(ALAU) were selected as an index of lead exposure. Height and weight were also meaured with calibrated automatic height-weight machine to produce fatness index directly. Personal information on smoking and drinking history were also collected. Blood pressure was mearured by trained nurses with automatic sphingomanometer. All workers took at least 30 minute rest before their measurement of blood pressure. The results obtained were as follows: 1. The prevalence rate of hypertension of lead exposed and non-exposed workers were 3.5% in both group without any difference. 2. There were no differences of systolic and diastolic pressure between groups divided by lead exposure, smoking habit, drinking habit. but the increase of age group made the difference of diastolic pressure, and only differenct of systolic pressure observed in age group of less than 20 and that of more than 40. 3. In pearson's correlation analysis, PbB was correlated with systolic pressure significantly, but not with diastolic pressure. PbB was also correlated with pressure difference(systolic pressure-diastolic pressure). 4. There were no significant increase of systolic, diastolic pressure and pressure difference by the increase of PbB and ZPP grouping. 5. Stepwise multiple regression analysis using systolic pressure as dependent variable and PbB, ZPP, ALAU, age, work duration, smoking habit, drinking habit and fatness (weight*0.9/height-100) as independent variables, revealed that PbB, age, drinking habit and fatness in order were significantly contributed to the dependent variable. 6. Stepwise multiple regression analysis using diastolic pressure as dependent variable and PbB, ZPP, ALAU, age, work duration, smoking habit, drinking habit and fatness (weight*0.9/height-100) as independent variables, revealed that ALAU, age and fatness in order were significantly contributed to the dependent variable. 7. Stepwise multiple regression analysis using pressure difference as dependent variable and PbB, ZPP, ALAU, age, work duration, smoking habit, drinking habit and fatness(weight*0.9/height-100) as independent variables, revealed that PbB, age and fatness in order were significantly contributed to the dependent variable. 8. Logistic analysis of hypertensive conditions with categorized blood lead and other selected categorized independent variables indicated that only age(40> and 40≤) and fatness(1.0> and 1.0≤) were significantly contributed to dependent variable with 95% significant odd ratio confidence interval. With above results, lead exposure in terms of blood lead seemed to be minimally contributed to the raise of blood pressure, and the effect of blood lead was found to be more prominent on the pressure difference than the systolic and diastolic pressure themselves.

과학경진대회의 문항과 분석과 학습지도 방안

이용복,배영부 서울교육대학교 과학교육연구소 1996 科學과 數學敎育 論文集 Vol.22 No.-

고정 스트레스 상태의 흰쥐에서 할로페리돌 전처치가 뇌생아민의 대사에 미치는 영향

이수복,양병환,김이영,이용성,고재경,김광일 漢陽大學校 精神健康硏究 1991 精神健康硏究 Vol.10 No.-

朝鮮의 石刻天文圖

李瑢馥 서울교육대학교 과학교육연구소 1997 科學과 數學敎育 論文集 Vol.23 No.-

미용입 십자형 필렛용접부의 기하학적 피로특성

李龍福,金慶燮 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-

Fatigue failure modes of symmetrical LOP fillet weldments are dependent on the characteristics of the fatigue crack initiation and propagation from the weld toe or the weld root. In this study, constant amplitude fatigue tests on symmetrical LOP fillet weldments carried out, and fatigue properties were evaluated. Also, an attempt was made to develop the fatigue strength and fatigue life of symmetrical fillet weldments containing lack of penetration. From the result of this study, fatigue crack growth characteristics of symmetrical LOP fillet weldments are found to be affected by the weld geometry, stress range and microstructures of the welding zone.

역할실험실을 위한 새로운 Air Table의 설계 및 실험방법

이계도,이희복,김용복 공주대학교 사범대학 과학교육연구소 1996 과학교육연구 Vol.27 No.1

고등학교와 대학교의 물리실험실에서 사용하고 있는 기존의 기록 타이머는 1차원 운동을 정확하게 기록할 수 있으나 2차원 운동은 기록할 수 없다. 본 연구에서는 1차원 운동뿐만 아니라 2차원 운동을 정량적으로 기록하여 실험결과를 분석할 수 있는 새로운 Air Table장치와 이를 사용한 역학 실험방법을 개발하였다. 본 장치를 사용하여 할 수 있는 실험은 1차원 운동, 운동의 제2법칙, 2차원에서의 포사체 운동, 충격량과 선운동량 보존, 각운동량 보존, 일-에너지 정리 등이다. The conventional recording timer which has been using at the physics laboratory of high schools and colleges gives a precise trace of one dimensional motion. However, it can not be used to get a trace of two dimensional motion. In this study, we have developed new air table and experimental procedures for the mechanics laboratory to analyse quantitatively the data obtained from one dimensional motion, the second law of motion, the projectile the data obtained from one dimensional motion, the second law of motion, the projectile motion in two dimensions, the impulse and linear momentum, the conservation of the linear momentum, the conservation of the angular momentum, and the work-energy theorem, etc.

時變磁界 測定用 센서에 관한 硏究

이복희,백용현,박형기,정승수,전덕규 경북대학교 센서기술연구소 1992 센서技術學術大會論文集 Vol.3 No.1

성인 여성의 자궁경부암 및 유방암 조기검진 수검행위에 영향을 미치는 요인

노윤녕,김영복,박용문,이원철,맹광호 韓國保健敎育.健康增進學會 2000 보건교육건강증진학회지 Vol.17 No.1

This study was aimed at preparing basic dada required for establishment of a cancer screening program by examining the status of cancer screenings performed by women in a city and the factors that had an influence on cervical and breast cancers screening behavior of women. In order to find out the status of cervical and breast cancers screening and the factors having an influence on cervical and breast cancers screening behavior, 1,113 women were selected as study area and subjects by a random cluster sampling method, and the subjects were answered by questionnaires. The major results were as follows. 1.In the cases of the breast and the cervical cancers, 16.7% and 55.7% of the subjects turned out to have had one or more screenings respectively in their life-time. Also the rate of screening group of cervical and breast cancers was 16.7%, the rate of screening group of only cervical cancer was 38.9%, and the rate of non-screening group was 44.4%. 2.As to the screening pattern of cervical and breast cancer, there were significantly for age, income, occupation, married status, spouse, the factors associated with health promotion (doctor visiting, exercising), married age, number of children, and breast feeding(p〈0.05). 3.The factors associated with screening behaviors for cervical and breast cancers were age, income, occupation, married status, doctor visiting, exercising, married age, number of children, and breast feeding(p〈0.05). Based on the above-mentioned results obtained by this study, it was anticipated that this study may be play a vital role as basic data for the development and execution of cervical and breast cancers screening program for women in a community. And the analysis, done on the basis of the status of the cancer screening, of the influence factors on cervical and breast cancers screening behavior showed that for the development of a cancer screening program, the factors like age, social-economic class, married status, health promotion behavior, and reproductive characteristics should be considered.

STS304 용접재의 피로거동에 관한 연구

李龍福,鄭鎭成,李柱翰 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1

In this study, fatigue crack behaviors of STS304 weldment were invesgated when a crack propergated from tensile residual stress region or compressive residual stress region. Crack gowth rates were predicted and compares with experimental result. The experimental results are summarized as follows : 1. For the crack propagation from tensile residual stress region, the maximum residual stress at the crack tip redistributes greater than for the initial residual stress, and the point where the residual stress converted from tension to compression is transferred along the direction of cracking. 2. In the case of fatigue crack propagation from tensile residual stress region, the prediction line of crack growth rate by the initial residual stress declines sharply after middle region and the prediction line by the redistributed residual stress more approaches the experimental results. 3. The fatigue crack from compressive residual stress region has very low fatigue crack growth rate compare with the tensile residual stress region. Because it has low effective stress ratio in compressive residual stress region and it is not almost relaxed compressive residual stress during the cyclic loading. 4. The predicted fatigue crack growth rates considering effects of crack closure are in better agreement with the experimental results, in spite of variation of the residual stress. But there are regions where affected by material properties.

알루미늄合金(A5052-0) 熔接部의 疲勞破壤擧動에 關한 實驗的 硏究

李龍福,元光浩 弘益大學校 1985 弘大論叢 Vol.17 No.2

This research deals with Aluminum-Alloy (A5052-0) weldments. In this research the following conclusions are obtained. 1. when the fatique crack in heat affected zone propagates to base metal zone, total life is long in the following order, base metal, unrestrained weld metal, restrained weld metal, and fatigue crack growth rate is low in the same stress intensity factor range in the following order, base metal, unrestrained weld metal, restrained weld metal. 2. when the fatigue crack in base metal zone propagates to heat affected zone, total fatigue life is long in the following order, restrained weld metal, unrestrained weld metal, base metal, and at first time crack growth rate on base metal is higher than in weld metal but lower at the middle of specimen. 3. In E.C.T. specimen and C.C.T. specimen residual stresses in weldments largely act on fatigue behavior and in E.C.T. specimen mechanical properties of bead zone extend total fatigue life.