전자상거래에서 고객의 신뢰와 구매력의 관계에 대한 연구

차준섭,장재혁 호남대학교 2002 호남대학교 학술논문집 Vol.23 No.2

B2C(Business to Customer) is one of the electronic commercial transaction. Recently, Internet Shopping mall that is the typical type of it has been on the sharp rise But of all the internet users, those who purchases actually online is few. With typical business, both parties(buyer and seller) came face to face so that they can check the quality of product and pay it to get directly. For e-commerce, however, these things are done in the virtual area of Internet. Therefore it is not possible for customers trust anything about online shopping as others easily, and it causes buying online not to be facilitated inevitably. For example, trying to buy online, customers worry about if the quality of products displayed in the internet mall is acceptable, delivery is to be done correctly and someone can steal our credit card number provided for paying Ironically while buying online increases steadily, reliability for shopping mall is no improved much better. As a result, to facilitate business to customer(B2C), it is required to analyze the factors to make online shopping reliable and the factors that are chief in improving reliability. This document reviews the major factors in trust, and relationship between customers trust and purchasing power, based on the recognition that reliability in business to customer(B2C) is important. With doing research in existing studies and classifying them, theoretic model is provided. For verification and discussion about this model, surveys targets 20∼30 years ole men and women have been made. First, the reputation of Internet Shopping mall do not influence customer trust. Second, two factors of safetyness and trust in e-channel do not influence customer trust, significantly. This point is shown that individual propensity than environmental influence is more important. Third, trust was found o have a strong positive effect on power of purchase. Implications of the findings are discussed for researchers and practitioners.

폐목재로 제조된 파티클보드의 성능평가

오용성,차재경,곽준혁 한국목재공학회 2002 목재공학 Vol.30 No.4

현재 폐목재의 발생량은 국내의 연간 목재사용량의 40% 정도의 수준으로 국내의 목재자급율을 고려해볼 때, 목재패널산업에서의 이런 폐목재의 재활용은 많이 장려되어야 한다. 본 연구는 폐목재로부터 얻어진 파티클과 실험실에서 합성한 요소수지를 폐목재파티클의 전건무게에 대해 6% 첨가하여 열압온도 162℃와 열압시간 5분에서 파티클보드를 제조하고 ASTM D 1037 방법에 의해 파티클보드의 성능을 평가하였다. 파티클보드의 성능을 평가한 결과는 KS F 3104 파티클보드 8.0형의 최소요구를 만족시키는 것이다. 이런 파티클보드의 성능평가 결과는 폐목재가 파티클보드의 원료로 적합하다는 것을 보여준다. The generation of wastewood is currently about 40% level of the amount of domestic wood use. When the rate of wood self-supply is considered, the recycling of wastewood in wood panel products industry should be encouraged. This study was evaluated the performance of particleboard (PB) made from wastewood. PBs were manufactured with the synthesized urea-formaldehyde resin at 5 minutes hot-press time, and at 162℃ press temperature with 6 percent resin solids level on an ovendry wastewood particle weight basis. The PBs were tested by the procedure of ASTM D 1037. Test results exceeded the minimum strength requirement according to KS F 3104 Particleboard type 8.0. The PB's performance showed that wastewood is suitable raw material for PB.

하악골에 발생한 골막 골육종

김태우,김승범,권혁찬,문선재,윤정훈,김형준,차인호,육종인,김진 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.1

Periosteal osteosarcoma is a distinct entity of malignant bone tumor with characteristic clinical, morphological, and histological features within the group of juxtacortical osteosarcoma. Periosteal osteosarcoma is predominantly located in the tubular long bones, and extremely rarely involving the jaws. A case of periosteal osteosarcoma of the right mandible is presented. A 27-year-old woman complained of the gingival swelling and bleeding tendency of the right posterior mandible. Clinical examination revealed a reddish brown strawberry-like swelling on the affected mucosa, which measured 1.5㎝×1.5㎝. The tumor was located on the lingual cortex of the mandible and extended into the surrounding soft tissues. Microscopically, the tumor consisted exclusively of atypical chondroblastic cells with a small osteoblastic area. A minimal bone marrow involvement was noted and the adjacent cortex was free of tumor. These findings suggested that the tumor originated from the periosteal cambium layer, which lies between the periosteal fibrous layer and the cortex of mandible.

DEVELOPMENT OF A SUPERCRITICAL CO₂ BRAYTON ENERGY CONVERSION SYSTEM COUPLED WITH A SODIUM COOLED FAST REACTOR

JAE-EUN CHA,TAE-HO LEE,JAE-HYUK EOH,SUNG-HWAN SEONG,SEONG-O KIM,DONG-EOK KIM,MOOHWAN KIM,TAE-WOO KIM,KYUN-YUL SUH 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.8

Systematic research has been conducted by KAERI to develop a supercritical carbon dioxide Brayton cycle energy conversion system coupled with a sodium cooled fast reactor. For the development of the supercritical CO₂ Brayton cycle ECS, KAERI researched four major fields, separately. For the system development, computer codes were developed to design and analyze the supercritical CO₂ Brayton cycle ECS coupled with the KALIMER-600. Computer codes were developed to design and analyze the performance of the major components such as the turbomachinery and the high compactness PCHE heat exchanger. Three dimensional flow analysis was conducted to evaluate their performance. A new configuration for a PCHE heat exchanger was developed by using flow analysis, which showed a very small pressure loss compared with a previous PCHE while maintaining its heat transfer rate. Transient characteristics for the supercritical CO₂ Brayton cycle coupled with KALIMER-600 were also analyzed using the developed computer codes. A Na-CO₂ pressure boundary failure accident was analyzed with a computer code that included a developed model for the Na-CO₂ chemical reaction phenomena. The MMS-LMR code was developed to analyze the system transient and control logic. On the basis of the code, the system behavior was analyzed when a turbine load was changed. This paper contains the current research overview of the supercritical CO₂ Brayton cycle coupled to the KALIMER-600 as an alternative energy conversion system.

A Spatial Presentation Model for Composite Multimedia Objects

Jae Hyuk Cha 한국데이타베이스학회 1998 Journal of information technology applications & m Vol.5 No.1

Oral Session : Does Competitive Balance Effects on Attendance Increase in Korea Porfessional Baseball League?

( Jae Hyuk Cha ),( Kyung Ro Chang ) 한국체육학회 2013 In Pursuit of Evidence-Based Sport and Exercise Sc Vol.0 No.-

DEVELOPMENT OF A SUPERCRITICAL CO₂ BRAYTON ENERGY CONVERSION SYSTEM COUPLED WITH A SODIUM COOLED FAST REACTOR

Cha, Jae-Eun,Lee, Tae-Ho,Eoh, Jae-Hyuk,Seong, Sung-Hwan,Kim, Seong-O,Kim, Dong-Eok,Kim, Moo-Hwan,Kim, Tae-Woo,Suh, Kyun-Yul Korean Nuclear Society 2009 Nuclear Engineering and Technology Vol.41 No.8

Systematic research has been conducted by KAERI to develop a supercritical carbon dioxide Brayton cycle energy conversion system coupled with a sodium cooled fast reactor. For the development of the supercritical $CO_2$ Brayton cycle ECS, KAERI researched four major fields, separately. For the system development, computer codes were developed to design and analyze the supercritical $CO_2$ Brayton cycle ECS coupled with the KALIMER-600. Computer codes were developed to design and analyze the performance of the major components such as the turbomachinery and the high compactness PCHE heat exchanger. Three dimensional flow analysis was conducted to evaluate their performance. A new configuration for a PCHE heat exchanger was developed by using flow analysis, which showed a very small pressure loss compared with a previous PCHE while maintaining its heat transfer rate. Transient characteristics for the supercritical $CO_2$ Brayton cycle coupled with KALIMER-600 were also analyzed using the developed computer codes. A Na-$CO_2$ pressure boundary failure accident was analyzed with a computer code that included a developed model for the Na-$CO_2$ chemical reaction phenomena. The MMS-LMR code was developed to analyze the system transient and control logic. On the basis of the code, the system behavior was analyzed when a turbine load was changed. This paper contains the current research overview of the supercritical $CO_2$ Brayton cycle coupled to the KALIMER-600 as an alternative energy conversion system.

Evaluation on the Existence Value of University Sports Team using Contingent Valuation Method

( Jae Hyuk Cha ),( Jung Min Lee ),( Yu Jin Lee ),( Kyung Ro Chang ) 한국체육학회 2015 국제스포츠과학 학술대회 Vol.2015 No.1

Purpose: Recently, for the financial difficulties of university due to restructuring and tuition cuts, the movement of breaking university sports team up or reducing the scale has been detected. However, the university sports team has played a vital role for producing outstanding individuals and providing an opportunity to be an athlete as a student. Therefore, the discussion of feasibility about reducing and abolishing university sports team is needed. Thus, the purpose of this study was to estimate the existence value of university sports team using CVM (Contingent Valuation Method). Method: By applying the CVM and creating single-bound and double-bound dichotomous choice model, the Willingness to Pay (WTP) by average individual was estimated. Using CVM, it is able to identify the information about demand and benefit for certain goods. In this study, a survey was carried out targeting the university student and established the range of the WTP amount based on the pretest. Result: We estimated the WTP for the university sports team which varies with environment and economic conditions of the respondents as well as personal characteristics or preference. The result revealed that involvement, knowledge, attitude, belief and individual income had influences on WTP. Conclusion: In this study, we calculated WTP for the university sports team based on the university student as the university member. Therefore, this study provides theoretical implications for the researchers and practical implications for practitioners.

초임계 이산화탄소 Brayton 에너지 전환계통 예비설계

차재은(Jae-Eun Cha),어재혁(Jae-Hyuk Eoh),이태호(Tae-Ho Lee),성승환(Sung-Hwan Sung),김성오(Seong-O Kim),김태우(Tae-Woo Kim),김동억(Dong-Eok Kim),김무환(Moo-Hwan Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

The supercritical CO₂ Brayton cycle energy conversion system is presented as a promising alternative to the present Rankine cycle. The principal advantage of the S-CO₂ gas is a good efficiency at a modest temperature and a compact size of its components. The S-CO₂ Brayton cycle coupled to a SFR also excludes the possibilities of a SWR (Sodium-Water Reaction) which is a major safety-related event, so that the safety of a SFR can be improved. KAERI is conducting a feasibility study for the supercritical carbon dioxide (S-CO₂) Brayton cycle power conversion system coupled to KALIMER(Korea Advanced LIquid MEtal Reactor). The purpose of this research is to develop S-CO₂ Brayton cycle energy conversion systems and evaluate their performance when they are coupled to advanced nuclear reactor concepts of the type under investigation in the Generation Ⅳ Nuclear Energy Systems. This paper contains the research overview of the S-CO₂ Brayton cycle coupled to KALIMER-600 as an alternative energy conversion system.

전력 평준화는 국내 프로야구 관중 수에 영향을 미치는가?

차재혁 ( Jae Hyuk Cha ),김지철 ( Ji Choul Kim ),김영배 ( Yeong Bae Kim ),윤승호 ( Seung Ho Yoon ) 한국스포츠산업경영학회 2014 한국스포츠산업경영학회지 Vol.19 No.6

본 연구는 경기 결과의 불확실성이 경기에 대한 흥미를 증가시킨다는 승부의 불확실성 가설이 국내 프로야구에도 적용될 수 있는지에 대하여 연구를 시도하였다. 이를 위해 전력평준화 측정을 위한 세 가지 방법을 통해 한국 프로야구의 전력평준화를 지수를 산출하였으며, 각 지수와 관중 수 간의 상관관계를 검증하였다. 또한, 시계열 자료의 안정성을 확보하기 위해 단위근 검정과 자기상관 여부를 판별하였다. 분석 결과, 본 연구에서 산출된 각각의 전력평준화 지수는 서로 유의한 상관관계가 있는 것으로 나타난 반면, 각 지수와 관중 수는 통계적으로 유의미한 관계가 존재하지 않는 것으로 확인되어 다른 경기관람요인과 함께 분석함으로써 이들 간의 명확한 영향관계에 대한 추가적인 검증의 필요성을 제언하였다. In this study we attempted to examine whether “Uncertainty Hypothesis of Game Outcome” can be applied to Korean Professional Baseball League(KPBL). Specifically, we investigated if uncertainty of game outcome measured by competitive balance leads to increase in interest on the attendance. In the pursuit of this purpose, we not only analysed the three types of competitive balance index of KPBL, also verified correlation between each of competitive balance index and number of attendance. Furthermore, we examined for unit root and autocorrelation in order to empirical testing and dealt with the stationary test of time series data. The findings of this study were as follows. While each of competitive balance index was emerged as correlated mutually, the correlation between each of competitive balance index and attendance revealed as nonsignificant. Therefore, it was suggested to consider other factors related to spectator attendance of KPBL for verification of the "Uncertainty Hypothesis of Game Outcome".