시클로 펜타디엔과 구조적으로 회전이 쉬운 Dienophile간의 Diels-Alder 반응에 대한 이론적 연구

김찬경,이인영,이본수,이익춘,김관수,주영협,Kim, Chan Kyung,Lee, In Young,Lee, Bon Su,Lee, Ik Choon,Kim, Kwan Soo,Joo, Young Hyup 대한화학회 1996 대한화학회지 Vol.40 No.7

Dieis-Alder reaction between cyclopentadiene and 5-membered ring compounds which have exo-cyclic double bond has been studied using the PM3 method. Transition states do not show large geometrical change with the variation of dienophiles. Two isomers are possible due to the rotation of the exo-cyclic double bond of a dienophile. The reactivity for the formation of different products are explained using the FMO energy gap. The exo and endo selectivity of the reaction has been also studied from the correlation between the deformation energy and the activation barrier. Minimum energy reaction path is discussed using the Curtin-Hammett principle.

Studies Related to the Penicillin Receptor

김찬경 ( Chan Kyung Kim ) 한국공업화학회 1995 한국공업화학회 연구논문 초록집 Vol.1994 No.1

한·중 호텔이용자의 충성도에 영향을 미치는 요인에 관한 연구

김찬경(Kim, Chan-Kyung),서성한(Suh, Sung-Han),이영자(Li, Ying-Zi),이병원(Lee, Byung-Won) 한국관광연구학회 2003 관광연구저널 Vol.17 No.2

This study investigate the relationship between antecedents of hotel users loyalty and loyal customer's behavioral responses, mainly depending on Korean and Chinese samples. Previous studies of service customer and their loyalty unveiled service loyalty is largely affected by customer's satisfaction, switching cost, and image factors. Loyal customers also tend to be of longer-tern relationship in their transactions, of high repurchase intention, and to diffuse positive word-of-mouth communication voluntarily.<br/> For the analysis of relationships, variables in the model were firstly conceptually and operationally defined, grounded on the prior researches. This study assumed that hotel user's satisfaction is determined by physical as well as service provider's features of a hotel, plus prior experience of dissatisfaction. Switching cost is proposed to be affected by alternative's attractiveness, sunk cost, and user's variety-seeking tendencies. At the same time, hotel image is hypothesized to be dependent on hotel's reputation in the industry and user's perceived congruence of the images between the hotel and himself/herself. Some researchers found that the switching cost plays as a determinant role for customer's loyalty while it is affected by customer's satisfaction and hotel image.<br/> Six hundreds of questionnaires were distributed to 300 Korean and 300 Chinese with an experience of local and/or foreign hotels in recent 3 years.<br/> 433 valid samples, 174 from Korean and 259 from Chinese were analysed to test hypothesis, using statistical package of AMOS 4.0 and SPSS 10.0 for Windows.<br/> Reliability and validity of the instrument were within acceptable level. Model and hypothesis in the form of structural equation model were tested via AMOS 4.0. Results revealed that hotel user's loyalty is affected by satisfaction, switching cost, and image factors. This study showed that image factors significantly influence customer's switching cost while satisfaction failed to have a significant impact on it. A model using Korean users only da1a showed the same outcomes as in the Chinese only user's model, which supposedly means that customer satisfaction is no more an idiosyncratic feature of hotel industry both in Korea and China<br/> Results from the analysis of cultual differences between Korea and China, borrowed form the idea of Hofstede's framework showed statistical significance in power distance and uncertainty while not in individualism and masculinity. Structural model in Korea reveals that switching cost does not influence hotel user's loyalty statistically. Chinese model neither showed significant path coefficient between satisfaction and loyalty, nor hotel image factors and loyalty.<br/> For the increase of practical applicability, further analysis of determinants in the model were executed and discussed its findings. Comments on the limitations of this study are hoped to make some contributions for the future research on the sectors of customer's Loyalty and hotel business strategy.

직장인의 스포츠 활동 참여와 직무만족간의 관계에 관한 연구

김찬경 ( Chan Kyung Kim ),임재영 ( Jae Young Lim ) 경희대학교 사회과학연구원 2001 사회과학연구 Vol.27 No.-

Virus Inactivation during the Manufacture of a Collagen Type I from Bovine Hides

배정은,김찬경,김성포,양은경,김인섭,Bae, Jung Eun,Kim, Chan Kyung,Kim, Sungpo,Yang, Eun Kyung,Kim, In Seop The Microbiological Society of Korea 2012 미생물학회지 Vol.48 No.4

Most types of collagen used for biomedical applications, such as cell therapy and tissue engineering, are derived from animal tissues. Therefore, special precautions must be taken during the production of these proteins in order to assure against the possibility of the products transmitting infectious diseases to the recipients. The ability to remove and/or inactivate known and potential viral contaminants during the manufacturing process is an ever-increasingly important parameter in assessing the safety of biomedical products. The purpose of this study was to evaluate the efficacies of the 70% ethanol treatment and pepsin treatment at pH 2.0 for the inactivation of bovine viruses during the manufacture of collagen type I from bovine hides. A variety of experimental model viruses for bovine viruses including bovine herpes virus (BHV), bovine viral diarrhea virus (BVDV), bovine parainfluenza 3 virus (BPIV-3), and bovine parvovirus (BPV), were chosen for the evaluation of viral inactivation efficacy. BHV, BVDV, BPIV-3, and BPV were effectively inactivated to undetectable levels within 1 h of 70% ethanol treatment for 24 h, with log reduction factors of ${\geq}5.58$, ${\geq}5.32$, ${\geq}5.11$, and ${\geq}3.42$, respectively. BHV, BVDV, BPIV-3, and BPV were also effectively inactivated to undetectable levels within 5 days of pepsin treatment for 14 days, with the log reduction factors of ${\geq}7.08$, ${\geq}6.60$, ${\geq}5.60$, and ${\geq}3.59$, respectively. The cumulative virus reduction factors of BHV, BVDV, BPIV-3, and BPV were ${\geq}12.66$, ${\geq}11.92$, ${\geq}10.71$, and ${\geq}7.01$. These results indicate that the production process for collagen type I from bovine hides has a sufficient virus-reducing capacity to achieve a high margin of virus safety.

이식을 위한 사람 양막의 소독 및 멸균공정에 의한 감염성 위해인자 불활화 효과

배정은,김찬경,김인섭,Bae, Jung-Eun,Kim, Chan-Kyung,Kim, In-Seop 한국미생물학회 2009 미생물학회지 Vol.45 No.4

Viral, bacterial, and fungal infection can be transmitted from donor to recipient via transplantation of human amniotic membrane. Therefore human amniotic membrane for transplantation should be disinfected and sterilized before use. The purpose of this study was to examine the efficacy of the disinfection process and sterilization processes used at human tissue bank in the inactivation of viruses, bacteria, and fungi. A variety of experimental model viruses, bacteria, and fungus for human pathogens, including the human immunodeficiency virus type 1 (HIV-1), bovine herpes virus (BHV), bovine viral diarrhoea virus (BVDV), hepatitis A virus (HAV), porcine parvovirus (PPV), Escherichia coli, Bacillus subtilis, and Candida albicans were all selected for this study. Enveloped viruses such as HIV-1, BHV, and BVDV were effectively inactivated to undetectable levels by 70% ethanol treatment, gamma irradiation process, and ethylene oxide (EO) gas sterilization process. Also non-enveloped viruses such as HAV and PPV were effectively inactivated to undetectable levels by gamma irradiation and EO gas treatment. However HAV and PPV showed high resistance to 70% ethanol treatment. E. coli and C. albicans were effectively inactivated to undetectable levels by 70% ethanol treatment, gamma irradiation process, and EO gas treatment. Also B. subtilis was effectively inactivated to undetectable levels by gamma irradiation process and EO gas treatment. However it showed high resistance to 70% ethanol treatment.

Y-방향족성의 본질과 존재에 대한 분자궤도론적 연구

이익춘,이본수,김찬경,Ikchoon Lee,Bon-Su Lee,Chan Kyung Kim 대한화학회 1985 대한화학회지 Vol.29 No.4

이소부틸렌 2가 음이온 및 디리티오이소보틸렌 이성질체들에 대하여 STO-3G최적화 계산을 수행하여 이들 화학종의 기하구조, 에너지, Mulliken 점유도등을 고찰하였다. 이들 화학종의 생성과 관련되는 몇 가지 isodesmic반응의 반응에너지 및 그로부터 추정된 상대적 생성에너지로부터 Y-형 2가 음이온에 대한 "Y-방향족성"의 기여와 이들 2가 음이온 유사체를 거치는 알킬화 반응을 좌우하는 구조적 요인을 고찰하였다. Ab initio calculations with STO-3G method were carried out on isomers of isobutylene dianion and dilithioisobutylene, and geometry, energy and Mulliken population were discussed. Energy of reaction, ${\Delta}$E, for isodesmic processes involving these species and relative heats of formation, ${\Delta}H_f$, estimated with ${\Delta}$E have shown that the contribution of "Y-aromaticity" to the structural stabilization of Y-type dianion is a tenuous one but the alkylation appears to proceed via the Y-type dilithio compound.

도입기와 성숙기의 광고 메시지 전략에 관한 연구

서성한(Suh, Sung-Han),김찬경(Kim, Chan-Kyung),임재욱(Lim, Jae-wook) 한국광고홍보학회 2002 광고연구 Vol.0 No.55

한국과 중국 가전산업의 외국계 공급업자와 현지 소매업자간의 장기지향성 결정요인에 관한 연구

박기안(Ki An Park),김찬경(Chan Kyung Kim),임재욱(Jei Uk Leem) 한국경영학회 2002 경영학연구 Vol.31 No.6

The purpose of this study is to find out the determinants of long-term orientation between suppliers and retailers of household electric appliances in Korea and Chtna, plus their structure and relationship, The constructs examined here include trust, dependence, environmental uncertainty(volatility & diversity), transaction specific assets, reputation, and satisfaction. It is hypothesized that trust(credibillty and benevolence). satisfaction, and dependence have positive impacts on long-term orientation, At the same tinge, it is hypothesized that volatility and transaction specific assets have a positive impact on dependence while diversity has a negative impact, In addition, reputation has a positive impact on trust(credibility and benevolence). A total of 147 questionnaires were collected by surveying household electric appliance retailers in Beijing, China, The result of analysis shows strong support far the hypotheses. But, the relationship between diversity and dependence, reputation and credibility, dependence and long-term orientation, credibility and long-term orientation is not supported. A total of 146 questionnaires were collected by surveying household electric appliance retailers in Seoul, Korea. The result of analysis shows strong support for the hypotheses. But, the relationship between volatility and dependence, diversity and dependence, transaction specific assets and dependence. reputation and credibility is not supported.

이상점 검출 기법을 활용한 감시 카메라 영상 내 실신 탐지

이성민(Seong Min Lee),김기철(Gi Cheol Kim),김찬경(Chan Kyung Kim),홍참길(Charmgil Hong) 한국정보과학회 2020 한국정보과학회 학술발표논문집 Vol.2020 No.12