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조직에서 사용자의 정보시스템 수용 : 지식경영시스템의 경우 Case of Knowledge Management Systems
이정섭 한국경영과학회 2004 한국경영과학회지 Vol.29 No.4
Organizations have attempted to develop Knowledge Management Systems for achieving competitive advantage by effectively managing organizational knowledge. However, if Knowledge Management Systems are not user-oriented, organizations may not attain desired goals. That is, it must be utilized and accepted by organizational members to be successful systems. This study proposes an extended Technology Acceptance Model and empirically validates it. For that purpose, a research model is set up that consists of antecedent variables, perception moderators, and intention to use the system. Empirical data analysis found significant relationships among research variables, as suggested in research hypotheses. The results of the analysis indicated that perceived usefulness, ease of use, job relevance and information quality should be considered as important factors in designing Knowledge Management Systems. In addition, perceived value, incentive, affect, self-efficacy, and image were found to influence the perception of users in the usage situation.
이충섭 부산교육대학교 초등교육연구소 1996 초등교육연구 Vol.8 No.-
The main aim of this study is to research the element of auditority and one of tactility as the important core streaming traditionally throughout Korean literature. As the result this study is intended to contribute to Korean literature education in order to understand and to appreciate it. The method to research it is the deductive one to make a promise of subject, first of all and then to look for its data. The scope of its data includes the whole field of Korean literature : 'Samgukyusa' which is one of the oldest and most precious document, talk tales and legends, the special works out of modern letters, the old poetry books of Korean traditional poets, the lyric poetry of the poets who had the abundance of Korean lyric emotion such as Seu. Jeong Ju. In Korean literature, the auditivity and the tactility have the characteristics that they are contributive to the dramatic expression of emotion as am essence of expressing feeling. Especially, tactility is not to be satisfied at being sufficient, but to be mobilized like such an identical conception as discontent of tactile isolation, annoyance, yearning and pain. Auditory seemed to be mobilized mainly as the expression of tactile isolation. In talk tales, legends, etc, especially the characteristics above appear outstandingly. In the novel, Hwang, Sun-Won's 'The Shower' has much of tactility and Lee, Cheong-Jun's 'The Light of Sound' is a masterpiece of auditory trait. In the poetry, Seo, Jeung-Ju's 'Jeo-Chok-Do' and Kim, So-Wal's 'The Azalea' have a specially outstanding tactile trait, and in auditory sense, there is much appearance of this trait in Kim, So-Wal's 'Invocation of the spirit of A Deceased' and modern child verse. In pop songs, auditory element has much in strong common like talk songs.
전자상거래를 통한 국내 인터넷 쇼핑몰 업체들의 기대 이득과 경쟁전략
장시영,이정섭 한국경영과학회 2000 經營 科學 Vol.17 No.3
The widespread diffusion of internet has enabled companies to conduct business in quite a different way. Marketing on the internet becomes more important as firms adopt electronic commerce as a means to implement competitive strategies. One hundred and four B2C shopping mall companies responded to an e-mail and web server survey about the anticipated benefits of electronic commerce and related strategies. The survey also asked about improvements in value chain activities and impediments to the implementation of electronic commerce in Korea. The results indicated that Korean shopping mall companies followed differentiation strategy significantly more than the other two strategies. In addition, six benefits factors were drawn from this study - information, productivity, cost savings, customers, management information, and applications. Productivity factor was related to cost leadership strategy, and customers factor was related with cost leadership, differentiation and focus strategies. Several benefits factors were also correlated with value chain activity improvements. The results of this study were compared with those of research conducted in the United States.
Jumping Tensegrity Robot Based on Torsionally Prestrained SMA Springs
Chung, Yoon Seop,Lee, Ji-Hyeong,Jang, Jae Hyuck,Choi, Hyouk Ryeol,Rodrigue, Hugo American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.43
<P>This paper introduces the addition of torsional prestrain into the manufacturing process of shape memory alloy (SMA) springs to form torsionally prestrained SMA springs. These springs have a better performance at the same power input for the same loads and same coil dimensions as regular SMA springs. A modified thermoconstitutive model was presented that can predict the behavior of the actuator based on the amount of torsional prestrain added into the manufacturing process, and a simple two-state model is used to predict its actuation stroke. These improved actuators were used in the development of a tensegrity robots capable of fast rolling motions and jumping both vertically and horizontally. This robot is capable of rolling at 0.14 BL/s (body length per second) and can jump up to nearly a full body length.</P> [FIG OMISSION]</BR>
Chung, Eun-Kyo,Shin, Jung-Ah,Lee, Byung-Kyu,Kwon, Ji-Woon,Lee, Na-Roo,Chung, Kwang-Jae,Lee, Jong-Han,Lee, In-Seop,Kang, Seong-Kyu,Jang, Jae-Kil Occupational Safety and Health Research Institute 2010 Safety and health at work Vol.1 No.1
Objectives: The level of benzene exposure in the petrochemical industry during regular operation has been well established, but not in turnaround (TA), where high exposure may occur. In this study, the characteristics of occupational exposure to benzene during TA in the petrochemical companies were investigated in order to determine the best management strategies and improve the working environment. This was accomplished by evaluating the exposure level for the workers working in environments where benzene was being produced or used as an ingredient during the unit process. Methods: From 2003 to 2008, a total of 705 workers in three petrochemical companies in Korea were studied. Long- and short-term (< 1 hr) samples were taken during TAs. TA was classified into three stages: shut-down, maintenance and start-up. All works were classified into 12 occupation categories. Results: The long-term geometric mean (GM) benzene exposure level was 0.025 (5.82) ppm (0.005-42.120 ppm) and the short-term exposure concentration during TA was 0.020 (17.42) ppm (0.005-61.855 ppm). The proportions of TA samples exceeding the time-weighted average, occupational exposure level (TWA-OEL in Korea, 1 ppm) and the short-term exposure limit (STEL-OEL, 5 ppm) were 4.1% (20 samples of 488) and 6.0% (13 samples of 217), respectively. The results for the benzene exposure levels and the rates of exceeding the OEL were both statistically significant (p < 0.05). Among the 12 job categories of petrochemical workers, mechanical engineers, plumbers, welders, fieldman and scaffolding workers exhibited long-term samples that exceeded the OEL of benzene, and the rate of exceeding the OEL was statistically significant for the first two occupations (p < 0.05). Conclusion: These findings suggest that the periodic work environment must be assessed during non-routine works such as TA.
Chung, Kwang-Seop The Society of Air-Conditioning and Refrigerating 2001 International Journal Of Air-Conditioning and Refr Vol.9 No.3
During the last decade, an increasing interest in Underfloor Air-Conditioning (UFAC) systems has emerged. The purpose of this paper is to evaluate the indoor environmental performance of office buildings with UFAC system in order to develope the design prototype of this system. The physical measurements and the Interviewing survey of occupant's sensation responses to the environment were carried out. Measurements and survey were made of the thermal environmental factors such as air temperature, relative humidity, air velocity, globe temperature, and the other several environmental factors such as the sound level and the illuminance of working plane, etc. And, the air quality was evaluated by measuring the concentration of suspended particles, carbon monoxide, and carbon dioxide in the room. Furthermore, the paper appraises the various indoor environmental factors of the room by using post-occupancy evaluation (POE) method in office building with UFAC system, and thus, it suggests the basic data for assessing the indoor comfort based on field measurements and survey .
Change in Alpha-fetoprotein Levels in Chronic Hepatitis B Patients on Tenofovir Therapy
( Chung Seop Lee ),( Beom Hee Kim ),( Sanghyuk Im ),( Ju Hyun Lee ),( Jung Wha Chung ),( Eun Sun Jang ),( Sook-hyang Jeong ),( Jin-wook Kim ) 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: Alpha-fetoprotein (AFP) has been widely used as a biomarkerfor hepatocellular carcinoma (HCC). However, AFP levels may elevatein chronic hepatitis B (CHB) patients who are candidates for oralnucleos(t)ide analogue (NA) therapy. The response of AFP levels totenofovir therapy is largely unknown. The aim of this study was toinvestigate factors related with AFP elevation and effects of tenofoviron AFP changes in CHB patients.Methods: The serial changes in AFP levels were analyzed in a retrospectivecohort of 262 naive CHB patients who received oversix-months of treatment with tenofovir.Results: Among the 262 patients, 71 showed high pre-treatment AFPvalues ( > 10 ng/dl), with mean and SD being 145.7 and 302.6ng/dl, respectively. When baseline parameters were statistically evaluatedin relation to the AFP value, albumin were significantly lower (p < 0.001) and prothrombin time, bilirubin and aspartate aminotransferase(AST) levels were significantly higher in the high AFP group( p = 0.002, 0.001 and 0.008, respectively). Post-treatment AFP wassignificantly reduced in both the high AFP (mean, 4.1 to 2.9 ng/dl[p < 0.001〕) and low AFP group (mean, 147.6 to 7.0 ng/dl [p <0.001〕). Kaplan-Meier analysis showed that normalization of AFP occurredin 62 patients (88.6%) during follow-up, with a mean normalizedtime of 9.1 months. There were 7 patients of newly diagnosedHCC during follow-up. Post-treatment AFP was significantly reduced(mean, 53.7 to 7.0 ng/dl [p < 0.043〕).Conclusions: In candidates for NA therapy, elevated AFP levels areassociated with more advanced stage of CHB. Tenofovir has shownefficacy in reducing AFP levels, even in newly diagnosed HCC patients.