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- 저자 : 柳浩永 (검색결과 106 건)
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柳浩永 건국대학교 1985 學術誌 Vol.29 No.2
This paper purposes to do exercise test as an effective method for the maintenance and promotion of factory workers' health and physical strength, and to find out what is necessary and effective to the improvement of their health condition. For the test, data wet·e taker in one of factories in Chungju area, restricting workers' present health condition and physical strength examination. We analyse the data on the basis of their health condition, degree of self-recognition of their physical strength, results of strength test, and degree of self-evaluation and self-satisfaction of their health condition. According to the analysis, one of the ways to improve their health condition is to make them practice self-control and some kinds of sports. The improvement ways are as follows; 1) self-control method: careful eating, no-smoking, active exercise, periodical health examination, early diagnosis, plenty rest, no excessive work, strict observation of sleeping hours, periodical strength test, regular life and early morning exercise. 2) exercise test: bare-hand gymnastics, exercising on the horizontal bar, table tennis, tennis, baseball, mount climbing, fast walking, walking, bicycle hiking, etc. The ways mentioned above are very effective for the improvement of the factory workers' hellth and physical strength. Especially speaking, we conclude that selective practice of the above items is good for the improvement of the workers' health and physical strength, in view of the results of exercise test found out in the study. Thus, we encourage them to practice the method which is shown in this paper.
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유호영 울산과학대학 2002 연구논문집 Vol.29 No.1
본 연구는 상용 소프트웨어인 PAM-STAMP, DYNA3D를 사용하여 3차원 스템핑 해석을 하였다. Forming과 아울러 Trimming, Spring-back 해석을 동시에 병행하여 현업에서 전 공정에 도움이 되는 해석을 수행하였으며, 접합판재 개발에 성형해석기법을 도입하여 그 효율성을 타진하여 보았다. This study is to analyze an illustration of 3-dimensional stamping using PAM-STAMP and DYNA3D which use a finite element method. Analysis of forming, triming and spring-back is carried out concurrently as the same course as actual metal forming predicted by deformation condition. Our illustration of PAM-STAMP and DYNA3D is found to do good performance at practical stamping works.
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柳浩永 건국대학교 부설 중원인문연구소 1988 論文集 Vol.7 No.-
This study, as a result of rope-skipping exercise practiced with aforementioned momentums (duration, frequency, intensity)by not the skilled player but the general woman college students, got the conclusions as follows: They have brought the elevation in order: 1. Standing Board Jump (confidence interval, elevation over 6 centimeters with 60%) 2. Sargent, Vertical Jump (confidence-interval, elevation over 1.2 centimeters with 60%) 3. Sit-Up (confidence-interval, elevation over 0.9 times with 60%) 4. 60 Run (confidence-interval, elevation over 0.09 seconds with 60%) 5. Step-Test (confidence-interval, elevation over 0.6 marks with 60%) 6. Trunk-Flexion (confidence-interval, elevation over 0.5 centimeters with 60%) 7. Flexed Arm Hang (confidence-interval, elevation over 60%) 8. Shuttle Run (confidence-interval, elevation over 60%) According to the result above, we can assume that rope-skipping exercise elevated in order power, muscle endurance, speed, body endurance, flexibility, and Agility, particularly muscle endurance showed some differences according to the region (abdominal muscle and brachial muscle) or exercise method(Static-Flexed Arm Hang, dynamic-sit-up). Therefore, we can mention that rope-skipping exercise is the best of all the sports for body exercise elevation basic physical strength in the view of time and economy at narrow section. Accordingly, rope-skipping exercise must be necessary for assistance exercise of all the sports not only athletics, ball games(Particularly football, basketball, volleyball, table tennis, etc) but also boxing or judo for a contest sports, etc.
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LFT소재 특성을 고려한 Door Carrier Plate 변형 해석
유호영(You, Ho-Young),박시환(Park, Sihwan) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.8
도어 모듈은 모듈화의 대표적인 예로 여러 부품들은 모듈형태로 완성하여 완성차 업체의 원가절감 및 조립 시간 단축, 품질 향상 등에 큰 기여를 이루었다. 주요 부품중의 하나인 Door carrier plate는 주로 steel을 이용한 press 성형이 주였으나 최근에는 PP-LFT(유리 장섬유 강화PP)를 사용한 사출 공법을 적용함으로써 형상자유도를 높혀 모듈 에 부착되는 많은 종류의 부품들을 통합할 수 있게 되었으며 중량 절감을 이룰 수 있게 되었다. 하지만 사출 성형시 제품의 형상 및 gate위치 설정의 한계성과, LFT의 특성에 의하여 변형이 비교적 심해 일반적으로 시사출 진행 후 보 상 가공을 진행하여 조립성을 개선한다. 이러한 사후 수정 공정은 금형의 품질 저하 및 생산원가 상승의 주요인이다. 부분적으로 사출 CAE를 적용하여 warpage정도를 예측하나 그 신뢰성 확보에 어려움을 겪고 있다. 따라서 LFT를 사 용하는 Door carrier plate에 대한 해석 신뢰성을 확보할 수 있는 기법으로 hyper-mesh에서 1차 mesh작업 후 moldlfow 자체 tool을 이용하여 mesh의 두께 구현성을 높혔으며, fiber orientation해석을 위하여 ARD-RSC model을 적용하였다. The modularization accomplished a big contribution in cost down and assembly-time shortening and the quality increase. But few improvements were made to this design largely due to the inflexibility of steel. In recent years, door modules made of PP-LFT material is manufactured using injection molding method. As a result, the plastic door modules allow more flexibility of door shape and become lighter. Warpage is generally large in the molded plastic door carrier plate due to the limitation of gate location and the fiber orientation. So after a few test injection the mold compensation processing for the improvement of an assembly characteristic. This research was performed to determine the factors that contribute to warpage for a injection-molded door carrier plate and presented differences in three mesh types of meshing method and its results. as a result we can improve process of tooling modification can reduce process of trial and error.
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