농업인 안전보험 분석을 통한 재해 현황

최동필,이경숙,김경란,김경수,조록환,최원종,이현경 대한직업환경의학회 2020 대한직업환경의학회 학술대회 논문집 Vol.2020 No.11

워킹이 Gullwing 리드의 솔더 접합부 형상에 미치는 영향

최동필,유중돈,이태수,최상균 대한용접접합학회 1998 대한용접·접합학회지 Vol.16 No.4

During the reflow process in SMT, the molten solder has been observed to move upward and solidify along the gullwing lead, which is called the wicking phenomenon. In this paper, possible causes of the wicking are investigated, and its effects on the solder joint profile are quantitatively estimated by introducing the wicking constant. The free energy reduction by intermetallic formation between the copper and tin seems to be the major source of wicking action. The joint profiles of the gullwing lead are calculated using the previous finite element formulation incorporated with the wicking constant. The calculated results show reasonably good agreements with the experimental data when the wicking effects are considered.

농업인의 무릎 통증 현황 : 전국 농업안전보건센터 자료를 이용

최동필,이철갑,박기수,노상철,송성욱,백소라,송한수,김경수,조록환,김효철,최원종,이현경,양예숙 대한직업환경의학회 2020 대한직업환경의학회 학술대회 논문집 Vol.2020 No.11

건강한 청소년에서 맥압과 경동맥 내중막 두께의 관련성

최동필,이주영,안성복,김현창 대한고혈압학회 2012 Clinical Hypertension Vol.18 No.1

Background:Wide pulse pressure associates with atherosclerosis, but it is unclear whether pulse pressure within a relatively normal range is associated with atherosclerosis in younger populations. The aim of this study was to investigate the association between pulse pressure and the carotid intima-media thickness (IMT) in healthy adolescents. Methods: Study participants included 250 (129 males and 121 females) adolescents who were 17 to 19 years old and in the third grade of a high school in Jangseong, Korea between November 20 and December 1, 2009. Pulse pressure was determined as the difference between systolic blood pressure and diastolic blood pressure which were measured with an oscillometric sphygmomanometer. IMT values were ultrasonographically measured at right and left common carotid arteries, and average of the mean IMT at each artery was used for analysis. Results: There was a significant correlation between pulse pressure and carotid IMT before (Pearson coefficient r = 0.2037, p = 0.001) and after (r = 0.1479, p = 0.020) adjustment for sex. When adjusted for sex, age, waist circumference,fasting blood glucose, and total/high-density lipoprotein cholesterol ratio, 10 mm Hg increase in pulse pressure was associated with increase of IMT in total (β = 10.9 ㎛, p = 0.003), in males (β = 17.3 ㎛, p < 0.001), but not in females (β = 3.609 ㎛, p =0.518). Conclusions: This study suggests that higher pulse pressure may be associated with increased carotid IMT even in healthy male adolescents.

한국 농업인의 직업성질환 DB센터 구축 및 활용방안

최동필,채혜선,김효철,김경수,이경숙 대한직업환경의학회 2016 대한직업환경의학회 학술대회 논문집 Vol.2016 No.11

3차원 납 접합부 형상을 이용한 표면실장기술의 적정 납량 결정

최동필,김성관,유중돈 대한용접접합학회 1996 대한용접·접합학회지 Vol.14 No.2

In order to rpovide proper SMT design criteria in a systematic way, a mathematical formulation has been developed to predict the configuration of the solder fillet formed between the gullwing type lead and rectangular pad. Effects of SMT design parameters such as the solder volume and pad dimension on the solder profile are investigated using the FEM that calculates the 3D configuration by minimizing the energy due to surface tension and gravity in the equilibrium state. Design criteria of QFP and SOP are illustrated by plotting the acceptable range of the solder volume with respect to the length and width ratios of the pad and lead. The results show that the acceptable design range increases with increase in the pad length and width. The pad length has more significant effects on design criteria compared with the pad width, and Bond number can be utilized to predict the joint quality.

유한요소 모델링을 이용한 Gullwing 리드의 3차원 솔더 접합부 형상 예측

최동필,유증돈,이태수 대한용접접합학회 1998 대한용접·접합학회지 Vol.16 No.4

The three-dimensional profile of a solder fillet is predicted by minimizing the surface tension and gravity energies of the solder joint using finite element modeling. Geometric complexity stemming from the inclined plane of the gullwing lead is resolved by employing three element types. These element types are used to describe the joint profile formed on the vertical, inclined and interfacial planes. The predicted solder joint profiles show good agreements with the experimental data provided that the solder volume is adjusted considering the wicking effects. Effects of the pad length, inclined lead angle and solder volume on joint profiles are also investigated.

Penicilline Allergy에 관한 統計的 觀察

최동필,이근복,이강수,장병열 국군의무사령부 1961 대한군진의학학술지 Vol.1 No.1

군 성교육지도자 양성을 위한 에이즈 교육 효과

최동필,김현창,김창수,허남욱 한국직업교육학회 2010 職業 敎育 硏究 Vol.29 No.2

It is known that the poor knowledge on HIV/AIDS is supposed to make poor attitude on person with HIV/AIDS (PWA). Unfair discrimination to the PWA is critical in a group life, such as military service in Korea. This study was investigated to explore the effect of an HIV/AIDS education program for newly trained gender education instructor in Korean military. Questionnaires were composed as knowledge on AIDS, attitudes on PWA and attitudes on AIDS and safety. Before-after test was used to evaluate the effect of education. To avoid the bias from learning effect, the questionnaires were designed to seal the section of the responds before the education, by each respondent. Total 2244 candidates of future gender education instructor were participated in education. Response rate was 62.5% (n=1403), and the subjects for analysis were 1,042 people who has no missing variables for demographic factors. Related to the knowledge on AIDS, the percentage of correct answer were high as over 80% before education. After the education, 3 items showed statistically significant increasing of correct answer proportion. However, the percentage was less than 60% for 'Kissing with a PWA'. And incorrect answer was increased for ‘Sharing injection needles which washed in a bleach or alcohol'. Attitudes on PWA were changed positively after the education, and the results were all statistically significant. However, the ‘Yes’ answer for ‘common use to razors or nail clippers with PWV’ was increased improperly, so precise contents and education skill is needed. No prior gender education experienced person showed negative attitudes on PWA. After the education, the attitudes were similar in all groups, according to the prior gender education experience. It supposes the effect on gender education for formation proper attitudes on PWA, following precise knowledge. It is needed that the standardization of education contents before the education to avoid confusion. 본 연구는 군내 성교육 정례화에 따라 사병을 대상으로 성교육을 실시할 성교육 지도자 양성교육 피교육자들의 보건교육 효과를 에이즈에 대한 지식과 태도 및 교육 후 변화로 평가한 것이다. 전문교육자를 필요로 하는 에이즈 보건교육의 특성상 성교육 지도자 양성과정의 효과 평가를 통해 직업교육으로서의 보건교육 효과 평가가 가능할 것이다. 피교육자들은 2004년 군의 성교육 지도자 양성교육을 받은 향후 성교육지도자 후보자 2,244명이었으며, 설문응답자 (62.5%) 중 인구사회학적 특성 변수의 무응답이 없는 1,042명이 최종 분석대상이다. 교육 효과는 에이즈에 대한 지식과 에이즈 환자 및 HIV/에이즈 전반에 대한 태도의 교육 전․후 비교를 통해 평가하였다. 에이즈에 대한 지식은 교육 전에 80% 이상의 정답률을 보여 기본적인 지식 수준은 높은 편이었고 교육 후에 통계적으로 유의한 정답률 상승을 보인 문항이 3개 있었다. 그러나 ‘입맞춤으로 인한 감염가능성’ 문항은 교육 후에도 정답률이 60% 미만에 그쳤고 ‘표백제나 알코올로 주사바늘을 닦아 사용할 경우 감염가능성’ 문항은 오답률이 상승하였다. 감염자에 대한 태도와 HIV와 에이즈에 대한 태도는 모두 긍정적인 방향으로 변화하였지만 ‘면도기나 손톱깎이 등의 공동사용’은 부주의로 인한 혈액감염 위험이 있음에도 제재하지 않겠다는 응답이 증가하여 보다 정확한 지식 전달의 중요성이 제기된다. 한편, 성교육 경험군별 응답은 성교육 비경험군의 태도가 에이즈 감염자나 에이즈에 대하여 교육 전에 가장 부정적이었으나 교육 후 성교육 경험군이나 비확실군과 유사한 수준으로 변화하였다. 따라서, 성교육 경험이 지식 상승과 바람직한 태도형성에 관여하는 것으로 보인다. 교육 후에 여전히 잘못된 지식과 부정적인 태도가 상승하는 경향을 보인 항목이 있었으므로 교육이 이루어지기 전에 교육 과정을 표준화하여 교육 내용이 상반되는 오류가 없도록 해야 할 것이며 환자에 대한 차별적 태도를 갖지 말아야 한다는 의식과 감염위험성에 대한 지식이 혼재하지 않도록 교육 과정에서 분명히 구분하여 피교육자들의 혼동을 줄여야 할 것이다. 이 연구는 편의추출과 무응답에 의한 연구방법론상의 제한점이 있으나 군에서의 성교육 지도자 양성교육 효과에 대하여 밝혔다는 데 나름의 의의가 있다.

사각형 패드를 사용하는 표면실장에서 납 연결부 형상의 3차원 유한 요소 모델링 ( Finite Element Modeling of 3-Dimensional Solder Joint Geometry Corresponding to Rectangular Pad in SMT )

최동필,이태수,유중돈 대한기계학회 1995 대한기계학회 춘추학술대회 Vol.- No.-