• 소성∙가공
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• 제16권8호
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• pp.590-595
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• 2007

This paper introduces a new approach to take account of bending history in finite element inverse analysis during sheet metal forming process. A modified membrane element was adopted for finite element inverse analysis so that bending-unbending energy was additionally imposed in the total plastic energy, predicting bending-unbending regions using the geometry of the final shape and tools. An algorithm was applied to a cylindrical cup deep drawing process. The blank shape and the distribution of the thickness strain were compared with those obtained from the incremental finite element analysis in order to evaluate the effect of the bending history. The algorithm reduced the difference between the results of the inverse analysis from those of the incremental analysis due to bending history. The analysis was also carried out with the variation of the thickness of the initial blank to investigate the effect of bending deformation. The results showed that the difference was remarkably reduced as the thickness of the initial blank increased. This indicates that the finite element inverse analysis cooperated with the suggested scheme is useful to obtain more accurate results, especially when bending effects are significant.

• 품질경영학회지
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• 제40권2호
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• pp.126-144
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• 2012

Lately, the importance of social responsibility of venture companies is becoming highlighted in Korea.This study is to empirically suggest that the practice of social responsibility by venture companies will become the foundation for formation of the organizational trust and for the sustainable growth of the organization. The certification on social responsibility for venture companies has been conducted for past five year and based on the research on difference of organizational validity on companies that are certified and non-certified by its practice of social responsibility, we've found organizational trust difference in two groups; the companies that already formed organizational trust did not have new mediation effect due to organizational commitment but the non-certified companies that did not have organization trust created new medication effect from organizational commitment. This can be understood that the organizational commitment effect through social responsibility is already formed for companies that have created organizational trust through social responsibility certification. The organizational infrastructure is needed for sustainable growth and development of an organization; therefore, the differentiated organizational trust for social responsibility certified organization will become the infrastructure for growth of the certified organizations.

• 한국연초학회지
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• 제20권2호
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• pp.198-204
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• 1998

This study was conducted to evaluate the effect of far IR radiation for the elimination of sidestream smoke components in a closed room. The measurements covered particle sizes of 13.8-542.5 nm, particle concentration, TSP, UVPM, FPM, solanesol, and the following gases and vapor components of smoke: carbon dioxide, carbon monoxide, nicotine, and 3-ethenyl-pyridine. Also, the changes of smoke odor strength by far IR radiation were tested by using the electronic nose system. There was no difference between control and far IR radiation in changes of the concentration of $CO_2$ and CO. The concentrations of TSP, UVPM, FPM, solanesol, nicotine, and 3-ethenylpyridine were reduced by far IR radiation. The growth and diminishing rate of RSP diameter was accelerated by far IR radiation compared with control. There was a little difference of smoke odor change with far IR radiation by electronic nose system analysis. Our results indicated that the use of far IR radiation had a little effect on changes of solid, vapor, and odor of smoke, but it had no effect on gaseous components.

• 한국의류학회지
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• 제28권7호
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• pp.873-881
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• 2004

This research was aimed to investigate the effect of enzyme and the addition of chelators on rotting of the Kenaf bast. Enzyme rotting was effective only when the chelators were added with the enzyme. EDTA was a more effective chelator than oxalic acid under 1% concentration. There was no difference in the rotting effect under different enzyme concentration levels, and under different treatment time and temperature. Therefore, it was found that enzyme rotting can be carried out with low enzyme concentration(0.125%) at room temperature. Retting time can be shortened when higher enzyme concentration and higher temperature are applied. Cellulose I structure of kenaf fiber did not change after enzyme rotting, and different enzyme concentration did not affect the crytallinity structure. Non-cellulosic matters such as hemicellulose, lignin, and pectin were present in the descending order in the enzyme rotted kenaf fiber, and there were no differences in their amounts due to enzyme concentration levels. There was no difference in the dyeabilities of kenaf fiber rotted with different enzyme concentration levels. Enzyme rotted kenaf fiber showed better cyeability when pectin, lignin, and hemicellulose were removed.

• Restorative Dentistry and Endodontics
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• 제14권2호
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• pp.103-110
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• 1989

The purpose of this study was to evaluate the cleansing effect of Glyoxide on the dentinal walls of the root canal. Fourty teeth were divided into four groups and the canals in each group were individually enlarged with K-file by step-back technic and irrigated with one of four irrigants. The four used irrigants were Glyoxide (Marion lab. U.S.A.) in combination with 3.5% sodium hypochlorite, 3.5% sodium hypochlorite, 3.5% sodium hypochlorite in combination with 3% hydrogen peroxide and normal saline solution. All the irrigants were used in conjunction with instrumentation as they would be during clinical conditions. After final irrigation, the canals were dried with paper points and the teeth were split longitudinally. The cleaness of canal walls according to the size and the level of canals were evaluated under steroscope by t analysed statistically The results were as follows. 1. The use of 3.5% sodium hyphochlorite in combination with 3.0% hydrogen peroxide revealed the most clean canal surface regardless of the size of canal at apical third of root canal (p < 0.05). 2. Glyoxide in combination with 3.5% sodium hyphchlorite showed no significant difference in cleaning effect of canal surface compared with 3.5% sodium hypochlorite and normal saline solution at the apical third of narrow canal. 3. Glyoxide in combination with 3.5% sodium hypochlorite revealed no significant difference in debridement of canal walls compared with 3.5% sodium hypochlorite in combination with 3% hydrogen peroxide and saline solution at the middle third of narrow and large canals.

• 대한한의학회지
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• 제24권3호
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• pp.23-34
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• 2003

Objective : In 2001, the rate of obesity in Korea reached 30.6%. There are many therapeutic ways to reduce body weight, such as low and very low calorie diet, exercise therapy, behavior modification therapy, etc. However, in many cases the patients feel stress under obesity treatment because of starvation. This study was aimed to evaluate the anti-starvation stress effect of Coicis Semen on mice. Methods : First, the mice were divided into 6 groups : Normal (group with no starvation), Control (administrated normal saline 6 times before starting 36 hours starvation), and Samples A, B, C, and D (administrated 0.25, 0.5, 1.0, 3.0 g/kg Coicis Semen respectively 6 times before starting 36 hours starvation). Then the plasma corticosterone level and rectal temperature were measured. The norepinephrine, dopamine, DOPAC (dihydroxy-phenylacetic acid), 5-HT (5-hydroxytryptamine) and 5- HIAA (5-hydroxy-indole-acetic acid) in the hypothalamus were measured by the HPLC method. Result : I. The rectal temperature in Sample group D showed a significant difference (P<0.05) compared with the Control group. 2. The DOPAC in Sample groups A, C and D showed the significant difference (P<0.05) compared with the Control group. Conclusion : It might be recognized that Coicis Semen has an anti-starvation stress effect.

• 한국패션뷰티학회지
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• 제2권1호
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• pp.86-92
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• 2004

The purpose of this study were to investigate the differences in depression, appearance interest, and appearance adornment according to demographic variables, and how to examine degree of make-up and visit to a beauty shop was influenced by depression, and demographic variables. Subjects were 117 elderly women in their 60's to 70's in Jinju, Korea. There was a significant difference in appearance interest according to age. There were significant differences in appearance interest, makeup, and visit to a beauty shop according to education. That is, the high level group of education had a high degree of makeup, and a high interest in appearance than the low level group. There was a difference in appearance interest and makeup according to healthy condition. That is, the good healthy group had a high interest of appearance, and the high degree of makeup than the poor healthy group. The degree of makeup had an effect on appearance interest and education($R^2=.505$). The visit to a beauty shop had an effect depression(-), yes or no of a mate, and allowance($R^2=.192$).

• 수산해양교육연구
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• 제28권5호
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• pp.1220-1230
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• 2016

The purpose of this study is to investigate the effect of 20s university student bodybuilders' protein intake differences with resistant exercise(weight training) by 12 weeks on solt lean mass and body composltion. Natural protein(Chicken breast meat) intake group and Whey protein isolates(WPI) intake group are the experimental groups. Conventional meal intake group is the control group. This study proposes a efficient protein diet for weight training. The results were as follows. In the experimental group(natural protein intake), muscle mass and lean body mass was significantly increased, but body fat percentage was significantly decreased. In the experimental group(WPI intake), muscle mass and lean body mass was significantly increased, but body fat percentage was significantly decreased. In the control group(conventional meal intake), muscle mass and lean body mass was insignificantly increased, but body fat percentage was insignificantly decreased. In addition, there was not a significant difference among intake groups, and also not a differentiated effect between natural protein and WPI intake. In conclusion, natural protein and WPI made muscle mass and lean body mass rise, body fat percentage reduced effectively. Only WPI intake(without natural protein intake) was the efficient mean to increase muscle mass and lean body mass, and to decrease body fat percentage.

• 아동학회지
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• 제34권6호
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• pp.13-29
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• 2013

The purpose of this study was to examine the mediating effect of moral disengagement concerning the parental psychological control on children's participant role behavior in bullying situations. For the purposes of this research, a group of participants comprising total 541 students of fifth, seventh, eighth, tenth and eleventh grades from schools based in Seoul and Incheon were surveyed. As far as research methods are concerned, scales for parental psychological control, moral disengagement and participant role behavior in a bullying situation were used. The main findings of this research were as follows. First, by gender, there was a significant difference in participant role behavior in bullying. By grade, a significant difference was shown in parental psychological control, participant role behavior in bullying and moral disengagement. Second, variables affecting participant role behavior in bullying situations were found to be influenced by the types of role behavior respectively as well as by students' grade levels. Third, moral disengagement concerning the influence of parental psychological control on participant role behavior was found to have a full mediating effect on bystander behavior among elementary school students and bullying behavior among middle school and high school students.

• 한국전자통신학회논문지
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• 제5권3호
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• pp.251-255
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• 2010

본 연구에서는 단일 주파수에서의 선행음과 후속음이 음원의 방향지각에 미치는 영향을 조사하였다. 실험은 자극간격 시간과 레벨차를 가진 1kHz 순음을 사용하였으며 기준음의 제시시간은 10ms로 하였다. 좌우 귀에 도달하는 시간차는 0.5ms로 두었다. 하나의 자극간격 시간에 대하여 4종류의 레벨차를 두었으며 제시음이 제시된 후 음이 좌에서 들리는지 우에서 들리는지를 판단하도록 하였다. 그 결과 후속음보다는 선행음이 음상정위에 미치는 영향이 크다는 것을 알 수 있었다.