• Title/Summary/Keyword: reliability factors

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A Study on the Manufacturing Technology for the Development of Heat Pipes with a Sintered Metal Wick (소결 금속 윅 히트파이프 개발을 위한 제조 기술 연구)

  • Choi, Jee-Hoon;Kim, Sung-Dae;Sung, Byung-Ho;Roo, Seong-Ryou;Park, Hyung-Ki;Kim, Chul-Ju;Ko, Han-Seo
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.479-482
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    • 2006
  • The most the electronic industry has recently accelerated the modularization, the miniaturization and the high integrated trend of electronics fields such as electronics components, appliances and etc., the most increasingly the heat generation problem rises. Even though the conventional cooling technologies are widely used in order to reduce the heat loads, the technologies are not easy to meet the present trends due to the fact that most of many conventional methods are relative to external form environments such as size, design and so on. With regardless of those environments, however, a heat pipe is one of the most efficient systems to improve the heat transfer performance. And then the performance of the heat pipe depends on a wick structure. Of various wick structures, sintered metal wick is known so that it has some advantages such as smaller pore size, increasing porosity as well as high reliability. In this study sintered metal wicks, thickness 0.7 mm, 0.8 mm and 0.9 mm, were manufactured as of $100{\mu}m$ copper powder to obtain the manufacturing technology of heat pipes mounted with a sintered metal wick. Furthermore, experiments for the operational performance factors such as capillary limit, thermal resistance were not only performed but also compared with a theoretical model simultaneously. Experimental results agreed with the theoretical model, and then it seems to be required to study various development processes of sintered metal wicks for the high performance of a heat pipe system.

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The Effect of Perceived Educational Services among the High School Students Majoring in Culinary Arts on School Satisfaction and Recommendation Intention (조리전공 고등학생들의 인지된 교육서비스가 학교만족도와 추천의도에 미치는 영향)

  • Song, Min-Kyung;Jung, Hee-Sun;Yoon, Hye-Hyun
    • Culinary science and hospitality research
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    • v.17 no.4
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    • pp.1-12
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    • 2011
  • The purpose of this study is to understand the influence of perceived educational services among the high school students majoring in culinary arts on school satisfaction and recommendation intention. A self-administrated questionnaire was completed by 282 subjects, and frequency, factor, reliability, regression analyses with SPSS 12.0 were conducted on the data. The main results were as follows. According to the multiple regression analysis, the educational services had some significant effects on school satisfaction, 'Specialized subjects service' and 'Facilities service' in the educational service factors had significant positive(+) influence on school satisfaction. The influence of the school satisfaction on the school recommendation intention showed that school recommendation intention increased when the students were satisfied with their school activities. Limitations and future research directions were also discussed.

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A Study on the Effect of Service Quality on Customers Satisfaction and Revisit Intention to Jeonju Bibimbap Specialty Restaurants (전주비빔밥 전문점의 서비스품질이 고객만족도, 재방문의도에 미치는 영향 연구)

  • Chae, Woon-Rang;Kim, Oe-Sun;Rha, Young-Ah
    • Culinary science and hospitality research
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    • v.19 no.4
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    • pp.109-118
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    • 2013
  • The purpose of this study is to know the effect of Jeonju bibimbap specialty restaurants' service quality on customer satisfaction and revisit intention. The respondents of this study were people who visited one of bibimbap specialty restaurants in Jeonju. The summary of this study is as follows. First, people tend to visit a bibimbap specialty restaurant once in two weeks on average. The most popular bibimbap restaurant is Gajokhoekwan (Family Hall). In addition, the purpose of visiting is usually to have dinner or lunch with family, and most respondents answered that information about bibimbap is shared with surrounding people. Second, it was found that the service reactivity factor and the food factor (among other factors such as facility, reliability) mostly affect customer satisfaction. Third, for the impact of customer satisfaction on revisit intention, revisit intention tends to increase as customer satisfaction increases. In that sense, to enhance customer satisfaction and attract more customers, restaurant operators need to strengthen effort for improvement of services by recognizing the importance of service quality.

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Development of Stress Coping Behaviors Measurement Scale for Korean Workers (제조업 근로자에 대한 스트레스 대처행동 측정도구 개발)

  • Jeong, Jin Wook;Heo, Kyung-Hwa;KIm, Ki-Woong
    • Korean Journal of Occupational Health Nursing
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    • v.16 no.1
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    • pp.48-57
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    • 2007
  • Purpose: To develop the stress coping behavior measurement scale(SCBMS) for the workers in manufacturing industry. Methods: Developing of SCBMS was based on job stress and psycho-social health status. Job stress and psycho-social health status were estimated by using the Karasek's job content questionnaire (JCQ) and the general health questionnaire (GHQ-28), and the general characteristics for subjects were estimated by self-reported questionnaire and interview. Result: The subjects were 456 male workers who had never been occupationally exposed to hazardous chemical and other materials, was mean age 31.27 years and mean work duration was 4.81 years. As a result of factor analysis for developed stress coping questionnaire, four factors were extracted such as inactive, active, health and emotional behavior from 15 question items of stress coping questionnaire. Fifteen items passed for item internal consistency (100% success rate) and item discriminant validity (100% success rate). Cronbach's alpha coefficient for each factor ranged from 0.56 to 0.77. The active behavior correlated positively with job demand of JCQ (r=0.12, p<0.05), but total GHQ-28 was negatively correlation (r=-0.24, p<0.01), respectively. Conclusion: These results demonstrated the reliability and validity of SCBMS. Thus, the results may prove to be a useful assessment tool in evaluating stress coping behavior.

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Perception of Dental Personnel and Dental Technicians on Interprofessional Collaboration - Focus on Dental Technicians - (치과 의료 인력과 치과기공사의 업무협력에 대한 인식 - 치과기공사 중심으로 -)

  • Kim, Jung-Suk;Lee, Hye-Eun
    • Journal of Technologic Dentistry
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    • v.36 no.2
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    • pp.119-128
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    • 2014
  • Purpose: This study has been carried out to help to enhance the measures of interprofessional collaboration between Dental personnel and dental technicians, and between dental technicians themselves through the analysis of recognition of interprofessional collaboration between dental technicians. Methods: The subjects in this study were 130 dental technicians who were self-written questionnaire. The results were analyzed by SPSS 12.0. The collected data was analyzed by frequency and Correlation. Results: As a result of examining the correlation analysis of each question to explore the factors that affect interprofessional collaboration recognition of dental technicians, the group which received criticism from dental personnel showed negative (-) correlation in the interprofessional collaboration recognition (p<0.05). The following groups showed positive (+) correlations in the recognition of interprofessional collaboration : the group who replied that they can utilize information on the patients associated with the prosthesis production (p<0.01); the group who thinks that they are sharing common goals (P<0.01); and the group who replied that Dental personnel are familiar with patients (p<0.01). The following groups also showed higher positive (+) correlations in the recognition of interprofessional collaboration : the group who replied that they frequently discuss patient's information with Dental personnel (p<0.01); the group who thinks they have mutual confidence in one another (p<0.01); the group who thinks that cooperation among their colleagues in dental technique laboratories are being done well (p<0.01); and the group that has high job satisfaction (p<0.01). Conclusion: Effective communication and team work between human resources for providing medical service of the facility are essential for safe and high-quality medical service to patients. Further, such elements are directly connected to efficiency of the entire team. The reliability between dental technician and Dental personnel for cooperation should not be neglected therefore continuous interests in inter-cooperative partnership is required.

Cu Metallization for Giga Level Devices Using Electrodeposition (전해 도금을 이용한 기가급 소자용 구리배선 공정)

  • Kim, Soo-Kil;Kang, Min-Cheol;Koo, Hyo-Chol;Cho, Sung-Ki;Kim, Jae-Jeong;Yeo, Jong-Kee
    • Journal of the Korean Electrochemical Society
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    • v.10 no.2
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    • pp.94-103
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    • 2007
  • The transition of interconnection metal from aluminum alloy to copper has been introduced to meet the requirements of high speed, ultra-large scale integration, and high reliability of the semiconductor device. Since copper, which has low electrical resistivity and high resistance to degradation, has different electrical and material characteristics compared to aluminum alloy, new related materials and processes are needed to successfully fabricate the copper interconnection. In this review, some important factors of multilevel copper damascene process have been surveyed such as diffusion barrier, seed layer, organic additives for bottom-up electro/electroless deposition, chemical mechanical polishing, and capping layer to introduce the related issues and recent research trends on them.

Reliability and Validity of A Korean Version of the Practice Skills Inventory I (한국어판 사회복지실천기술 척도(Practice Skills Inventory)의 신뢰도와 타당도 평가 I - 의료사회복지사와 정신보건사회복지사를 대상으로 -)

  • Kim, Yong-Seok;Kim, Jang-Bae;Lee, Young-Sook;Lee, Hyun-Ju
    • Korean Journal of Social Welfare
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    • v.62 no.4
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    • pp.5-32
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    • 2010
  • Although social work practice skills are one of the important components of social work practice, research on social work practice skills has been very scarce. It seems that the reason might be a lack of standardized instruments used to measure social work practice skills. The purpose of this study is to validate a Korean version of the Practice Skills Inventory(PSI) developed by O'Hare and colleagues. The PSI is the only instrument developed in the field of social work to measure the frequency of social work practice skills that social workers use. A total of 310 social workers working in medical or mental health field were participated in this study. A result of confirmatory factor analysis showed that the Korean version of the PSI is composed of 4 factors like its english version. The Korean version of the PSI was also reliable and valid. Implications for social work research, practice and education are provided.

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The Effect of Cognitive Response on Behavioral Response of Consumers to Sold Out Products On-line Shopping Malls (인터넷 쇼핑몰 품절 경험 후 인지적 반응이 행동적 반응에 미치는 영향)

  • Kim, Joo Hyun;Lee, Jin Hwa
    • Journal of the Korean Society of Costume
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    • v.66 no.4
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    • pp.32-44
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    • 2016
  • The purpose of this study is to examine the cognitive responses and the corresponding behavior responses of consumers who have experiences in not being able to buy a product in an online shopping mall due to it being sold-out. Responses were gathered from 526 consumers between the ages of 20 to 40 years residing in a metropolitan area. Each person surveyed had experienced a situation in which a product that they wanted to purchase from an online shopping mall was sold-out. SPSS 18.0 was used to perform frequency analysis, factor analysis, reliability analysis, and regression analysis. The first set of results of this study showed positive responses of quality, discernment, scarcity, but also negative cognitive responses of careless management, manipulation of shopping mall management, and common taste. In negative cognitive responses, sold-out situations caused consumers inconvenience. The second set of results revealed that quality, discernment, and careless management had a significant effect on product replacement (Substitute, S); likewise, factors such as quality, discernment, careless management, manipulation by shopping mall designers, and common taste had a significant effect on the delay of purchasing decisions (Delay, D). Scarcity, careless management, manipulation by shopping mall designers, and common taste also demonstrated significant influence on the incomplete leaving of stores (Incomplete Leave, L1), while discernment, scarcity, careless management, manipulation by shopping mall designers, and common taste had a significant influence on the complete leaving of stores (Complete Leave, L2). Previous studies have examined the behavioral response topics of substitute, delay, and leave. These study results suggest that product sellouts at online shopping malls did not have a solely negative effect on consumers. It actually had a positive effect in terms of discernment, scarcity, and the perception of quality of sold-out products. Furthermore, both positive and negative cognitive responses had various effects on behavioral responses.

A Study on the Effects of Ethical Consumption Consciousness on Purchase Attitude of Consumers - Focused on Recycled Apparel - (윤리소비의식이 재활용 의류제품 구매태도에 미치는 영향에 관한 연구)

  • Cha, Gayoung;Kim, Munyoung
    • Journal of the Korean Society of Costume
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    • v.64 no.5
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    • pp.125-140
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    • 2014
  • This study aims to investigate the effects of ethical consumption consciousness on the attitude of consumers toward purchasing recycled apparel and suggest guidelines to improve awareness and induce purchase on recycled and eco-friendly apparel. The following steps were taken: 1) examination of the status of consumer consciousness on recycled apparel and their usage 2) investigation of how ethical consumption consciousness affects purchase attitude of recycled apparel 3) finding out whether purchase experience of recycled apparel makes a difference in ethical consumption consciousness and purchase attitude. 311 males and females living in the Daegu region were used as subjects. Questionnaires were distributed for around 2 weeks for data collection. A total of 298 surveys were used for analysis due to the other thirteen being excluded for not having quality responses. Collected data were used to perform frequency analysis, factor analysis, reliability analysis, descriptive, regression analysis by using SPSS 18.0 Korean version. Results are as follows: First, regarding the status of consumer consciousness on recycled apparel and their usage, respondents considered convenience as an important factor. On the contrary, factors such as usage, participation intention and positive attitude on recycled apparel were relatively high. Second, regarding how ethical consumption consciousness affects purchase attitude on recycled apparel, the analysis result showed that having consciousness for environmental protection and volunteering significantly affected purchase attitude toward recycled apparel whereas business ethics did not affect it. Third, the responses from the consumers with purchase experience of recycled apparel and consumers without it showed that being conscious of environmental protection significantly affected both groups.

Six Sigma Robust Design of Composite Hand for LCD Glass Transfer Robot (LCD 유리 이송용 복합재료 로봇 핸드의 식스 시그마 강건설계)

  • Nam Hyunwook
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.3 s.234
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    • pp.455-461
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    • 2005
  • This research studied robust design of composite hand for LTR (LCD glass Transfer Robot). $1^{st}$ DOE (Design of Experiment) was conducted to find out vital few Xs. 108 experiments were performed and their results were statistically analyzed. Pareto chart analysis shows that the geometric parameters (height and width of composite beam) are more important than material parameters $(E_{1},\;E_{2})$ or stacking sequence angle. Also, the stacking sequence of mid-layer is more important than that of outer-layer. The main effect plots shows that the maximum deflection of LTR hand is minimized with increasing height, width of beam and layer thickness. $2^{nd}$ DOE was conducted to obtain RSM (Response Surface Method) equation. 25 experiments were conducted. The CCD (Central Composite Design) technique with four factors was used. The coefficient of determination $(R^{2})$ for the calculated RSM equation was 0.989. Optimum design was conducted using the RSM equation. Multi-island genetic algorithm was used to optimum design. Optimum values for beam height, beam width, layer thickness and beam length were 24.9mm, 186.6mnL 0.15mm and 2402.4mm respectively. An approximate value of 0.77mm in deflection was expected to be a maximum under the optimum conditions. Six sigma robust design was conducted to find out guideline for control range of design parameter. To acquire six sigma level reliability, the standard deviation of design parameter should be con trolled within $2{\%}$ of average design value