Low Temperature Growth of Carbon Nanotubes for Triode-Type Field-Emitter Array by Chemical Vapor Deposition

Jong Hyun Moon,Jang Jin,C. R. Lee,Choong Hoon Lee,J. J. Kim,Kyu Chang Park,Sung Gu Kang,Sung Hoon Lim,Woo Kyung Bae 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.2

We have grown carbon nanotubes (CNTs) in the gate holes for triode-type FEA (eld-emitter array) by plasma-enhanced chemical vapor deposition (PECVD) by varying the growth temperature between 400 C and 580 C. By applying plasma pretreatment onto catalyst metal, we have developed the low-temperature growth of CNTs by PECVD for triode-type FEA. The activation energy for the growth rate was found to be 0.47 eV, much less than that by chemical vapor deposition (1.2 1.5 eV). Plasma post-treatment on the grown CNTs can control the length of CNTs in the gate hole, resulting in enhanced eld-emission characterization. Uniform light emission from the triode-type eld emitter could be realized by optimizing the CNT length through the plasma treatment time.

Applying Academic Theory with Text Mining to Offer Business Insight : Illustration of Evaluating Hotel Service Quality

Choong C. Lee,Kun Kim,Haejung Yun 한국경영정보학회 2019 Asia Pacific Journal of Information Systems Vol.29 No.5

Now is the time for IS scholars to demonstrate the added value of academic theory through its integration with text mining, clearly outline how to implement this for text mining experts outside of the academic field, and move towards establishing this integration as a standard practice. Therefore, in this study we develop a systematic theory-based text-mining framework (TTMF), and illustrate the use and benefits of TTMF by conducting a text-mining project in an actual business case evaluating and improving hotel service quality using a large volume of actual user-generated reviews. A total of 61,304 sentences extracted from actual customer reviews were successfully allocated to SERVQUAL dimensions, and the pragmatic validity of our model was tested by the OLS regression analysis results between the sentiment scores of each SERVQUAL dimension and customer satisfaction (star rates), and showed significant relationships. As a post-hoc analysis, the results of the co-occurrence analysis to define the root causes of positive and negative service quality perceptions and provide action plans to implement improvements were reported.

한국 주요 기업 ERP 패키지 도입의 재무성과: 탐험적인 비교 검증

이중정 ( Choong C. Lee ),홍성완 ( Sung Wan Hong ),박영훈 ( Young Hoon Park ),최희재 ( Hee Jai Choi ) LGCNS 엔트루정보기술연구소 2006 Entrue Journal of Information Technology Vol.5 No.2

본 연구는 ERP 시스템이 기업성과에 미치는 영향에 대하여 ERP 도입효과에 대한 분석 차원에서 이루어졌다. ERP 패키지를 도입한 국내 주요기업과 미도입 기업과의 재무적 성과를 도입시점을 전후로 나누어 비교분석하고 세부적으로는 도입기업을 대상으로 기존 연구들에서 공통적으로 언급된 ERP 도입의 핵심성공요인을 바탕으로 카테고리를 나누어 각각의 성공요인에 대한 성과 측정의 측면에서 객관적인 재무정보를 이용하여 ERP 구축에 따른 경영성과가 어떤 경우에 우월하게 발생하였는지를 탐험적으로 알아보았다. 그 결과 ERP 도입 시에 재무적으로 영향을 미치는 성공요인으로는 PI 시행 여부, Extended ERP 도입 여부, Task Force 팀 유지 여부, 변화관리 유무 등으로 나타났다. 장기적이고 지속적인 ERP 적응 노력이 이러한 주요 변수의 공통적인 성격임을 추론할 때 궁극적인 도입효과에 있어 기업의 장기적인 수행능력(capability) 향상 노력이 단기적인 IT 자원(resource)의 구축과 함께 강조되어야 함을 보여 주고 있다. This study is to investigate the impact of ERP package system on firm`s financial performance. Upon the conflicting results of previous a few studies on ERP impact on firm performance, this study tries to make the financial comparison between ERP-adopted and not-adopted firms among major Korean firms through a matched sample comparison group methodology and publicly available financial ratings. In addition, based on the key success factors for ERP adoption and implementation from previous studies, we test if these factors can make the difference in the financial performance among the ERP-adopted firms. Results indicate that firms with and without ERP do not show any statistically significant difference in financial performance over 3 years of time span before and after ERP adoption. However, among the ERP adopters, ones with successful PI implementation, Extended ERP implemantion, post-ERP Task Force Team, long term change management effort show the relatively strong financial performance than ones without these factors. This study findings overally indicate that while ERP system in major Korean firms may not produce the significant impacts on the firm`s financial performance yet, long term commitment and the development of IT capability to successfully use the ERP systems, as represented by the identified success factors above, would decide the winner of ERP venture in the long run.

ICT 기반 공유경제 발전을 위한 학문적 노력에 대한 고찰: 국내외 MIS와 유관 분야의 학술연구를 대상으로 메타분석

이중정 ( Lee Choong C. ),안재영 ( An Jaeyoung ),김행미 ( Kim Haengmi ),김우석 ( Kim Wooseok ) 한국지식경영학회 2020 지식경영연구 Vol.21 No.4

공유경제가 디지털 서비스 플랫폼을 기반으로 한 새로운 경제체계로 인식되고 있지만, 국내에서는 사회적인 인식과 이해의 부족으로 공유경제가 아직 자리잡지 못하고 있다. 해외 경제 선진국과 같이 새로운 비즈니스를 창출하고, 이를 통해 신규 시장을 개척하기 위해 공유경제를 긍정적 관점에서 바라보고 이해할 필요성이 있다. 이에 본 연구에서는 전세계 각 학문 분야에서 진행된 지난 10년간 공유경제 연구를 수집하여 학술적 관점에서 공유경제 연구의 현황을 살펴보고, 더 나아가 이 중에서 MIS 영역의 연구를 선별하여, 공유경제 내 MIS 영역 연구의 동향도 분석해 보았다. 본 연구를 통해 공유경제와 MIS 연구의 연구 흐름을 확인하였고, 공유경제에서의 MIS 연구 중요도와 연관성을 살펴봄으로써 두 연구 간 학제적 연구의 필요성도 도출하였다. 따라서 다양한 학문적 접점을 가진 공유경제가 인접 학문의 활발한 연구를 독려하고, 더 나아가 사회, 경제, 산업적으로 보다 긍정적으로 한국에 자리매김하는데 본 연구가 기여할 수 있기를 기대한다. The sharing economy is recognized as a new economic system based on the digital service platform, but the sharing economy has yet to be established in Korea due to a lack of social awareness and understanding. There is a need to enhance understanding and awareness of the sharing economy in positive perspective in order to make up business with advanced economies global and explore new markets. In this study, after collecting papers of the sharing economy over the past decade published by each academic field around the world, we reviewed them from academic lens and conducted a comprehensive analysis using meta analysis methodology. Then, we selected papers of MIS field and analyzed the trends of the MIS field research in these papers. As a result we identified the research trend of the sharing economy and the MIS research and drew the necessity of interdisciplinary research between the two studies by examining importance and relevance of MIS research in the sharing economy research. Therefore, we expect that this study contributes to promote interdisciplinary research with neighboring disciplines and to establish a positive social, economical and industrial position in Korea.

SI 프로젝트에 있어서 프로젝트 관리자의 정보화 역량과 관리 역량이 프로젝트 성공도에 미치는 영향에 대한 연구: 프로젝트 규모의 조절효과를 중심으로

이중정 ( Choong C. Lee ),박주연 ( Joo Yeon Park ),최정훈 ( Jeong Hoon Choi ) 한국정보시스템학회 2012 情報시스템硏究 Vol.21 No.4

Information Systems has played a strategic role in achieving business goal and become an essential tool in today`s business environment. Thus, the number of developing SI project has increased and it becomes complex and sophisticated. It is known that project manager`s leadership could lead the project success. In this study, project manager`s competencies are divided into two types, information competency(information-oriented mind, information utilization competency, information development competency) and managerial competency(project management, human relationship, project expertise. The purpose of this study is to examine the effect of information competency and managerial competency on the SI project success and to find out the moderating effect of project size. The result of this study reveals that information utilization competency, project management competency and human relationship have a strong relationship with both customers and suppliers side of projet success. Moreover, the relationship between managers` competencies and project success is shown to be different by project size. The result of this study implies that each managers` competencies has to be developed and applied according to project`s complexity and size.

모바일 지갑의 가치와 지속사용의도의 영향요인

이청아(Chungah Lee),윤혜정(Haejung Yun),이충훈(Chunghun Lee),이중정(Choong C. Lee) 한국전자거래학회 2015 한국전자거래학회지 Vol.20 No.1

모바일 쿠폰과 멤버십 카드를 통합적으로 관리하는 모바일 지갑은 사용 편리성과 경제적 혜택으로 인해 빠르게 성장하고 있는 모바일 서비스 중의 하나이다. 그러나 빠른 성장에도 불구하고 모바일 지갑을 지속적으로 사용하지 않는 단기 사용자의 증가는 모바일 지갑 서비스 제공자들이 수익창출을 위해 해결해야 할 주요한 문제점이 되고 있다. 본 연구에서는 모바일 지갑 사용자의 서비스 사용기간을 늘리기 위한 주요 고려사항을 도출하기 위해, 모바일 지갑사용자의 지속적인 사용의도에 영향을 주는 요인을 이익(Benefit)과 비용(Sacrifice)측면으로 나누어 종합적으로 분석 가능한 VAM(Value-based Adoption Model)을 적용하여 검증하였다. 연구결과, 이익 측면에서는 유용성, 가치표현, 인지된 보안과 즐거움이 지각된 가치에 유의한 영향을 미치는 것으로 나타났으며, 비용 측면에서는 기술의 복잡성이 지각된 가치에 유의한 영향을 미치는 것으로 확인되었다. 또한, 지각된 가치는 지속사용의도와 유의한 관계를 갖는 것으로 검증되었다. 본 연구결과를 활용해 모바일 지갑 서비스 제공자가 단기 사용자를 위한 서비스의 개선 및 마케팅 시에 기능 측면뿐만 아니라 감성적 측면의 요인들까지 고려할 수 있을 것으로 기대한다. Mobile wallet that can keep coupons and membership cards for mobile is one of rapidly growing services due to its usability and financial benefit. However, in spite of its rapid growth, the increase of users who do not use continuously it is an important consideration to service providers for making a profit. This study aims to test the effects of factors affecting the continuous use intention of mobile wallet based on VAM (Value-based Adoption Model) which can analyse them in both benefit and sacrifice aspects, so as to suggest considerations to increase the use period of mobile wallet for service providers. The research findings supported the hypotheses regarding to the effects of usefulness, value-expression, perceived security and enjoyment in the benefit aspect and technicality in the sacrifice aspect on perceived value. In addition, the causal path from perceived value to continuous use intention was significant. The study results are expected to be used in marketing or service improvement for short-term users by taking account of emotional factors as well as functional factors.

업무특성과 BSC 시스템 특성의 적합도가 BSC 시스템 사용자 만족도에 미치는 영향

이창진(Changjin Lee),이정훈(Junghoon Lee),이중정(Choong C. Lee),송준우(Joonwoo Song) 한국데이타베이스학회 2009 Journal of information technology applications & m Vol.16 No.2

The balanced scorecard(BSC) framework is a tool for strategic decision making and task support that aims for efficiency in performance management and strategy execution. BSC evolved from an old performance management practice, which tended to be limited to a finance-only perspective, to a new system of corporate management looking at corporate tasks from a multi-dimensional, future-inclined value perspective. This form of BSC amounts to a framework capable of driving management innovation and renewing the ways in which companies conceive their strategy and perform their operations. Since BSC draws integrally on user participation, it can be expected that users' satisfaction with BSC systems is an important factor in systems' success or failure. However, previous studies of the BSC system have not yet considered it as a theoretical model, specifically examining BSC system and task characteristics. To date, only a few studies have put forward plans for the implementation and use of BSC systems, and these studies have the common limitation of failing to consider the circumstances or theoretical structure of the companies for which a BSC system is being proposed. This paper then begins to fill some of this gap by characterizing the BSC system from the perspective of contingency theories. Contingency theories can be particularly useful in the Korean context in exploring how different companies use the BSC system in ways determined by their unique environmental characteristics, which may also determine the performance factors behind the application of a company's particular BSC system. In order to provide concrete suggestions for implanting and using the BSC system from a contingency theory perspective, this study sets out to determine the relationships between the contingency variables affecting BSC system performance and BSC system property variables(in given cases) through an empirical analysis. The study takes into account the perspective from which contingency theory is to be applied in individual cases, sets contingency and BSC property variables with reference to the BSC system user's environment and BSC system's character, and frames initial hypotheses concerning corporate structure and environmental variables and BSC system performance variables with reference to previous studies. A survey was then conducted on users in Korean companies that have implemented the BSC system in order to verify the research model and understand results.

<i>OsCOL4</i> is a constitutive flowering repressor upstream of <i>Ehd1</i> and downstream of <i>OsphyB</i>

Lee, Yang-Seok,Jeong, Dong-Hoon,Lee, Dong-Yeon,Yi, Jakyung,Ryu, Choong-Hwan,Kim, Song L.,Jeong, Hee J.,Choi, Sang C.,Jin, Ping,Yang, Jungil,Cho, Lae-Hyeon,Choi, Heebak,An, Gynheung Blackwell Publishing Ltd 2010 The Plant journal Vol.63 No.1

<P>Summary</P><P>Plants recognize environmental factors to determine flowering time. <I>CONSTANS</I> (<I>CO</I>) plays a central role in the photoperiod flowering pathway of Arabidopsis, and CO protein stability is modulated by photoreceptors. In rice, <I>Hd1</I>, an ortholog of <I>CO</I>, acts as a flowering promoter, and phytochromes repress <I>Hd1</I> expression. Here, we investigated the functioning of <I>OsCOL4</I>, a member of the <I>CONSTANS-like</I> (<I>COL</I>) family in rice. <I>OsCOL4</I> null mutants flowered early under short or long days. In contrast, <I>OsCOL4</I> activation-tagging mutants (<I>OsCOL4-D</I>) flowered late in either environment. Transcripts of <I>Ehd1</I>, <I>Hd3a</I>, and <I>RFT1</I> were increased in the <I>oscol4</I> mutants, but reduced in the <I>OsCOL4-D</I> mutants. This finding indicates that <I>OsCOL4</I> is a constitutive repressor functioning upstream of <I>Ehd1.</I> By comparison, levels of <I>Hd1</I>, <I>OsID1</I>, <I>OsMADS50</I>, <I>OsMADS51</I>, and <I>OsMADS56</I> transcripts were not significantly changed in <I>oscol4</I> or <I>OsCOL4-D</I>, suggesting that <I>OsCOL4</I> functions independently from previously reported flowering pathways. In <I>osphyB</I> mutants, <I>OsCOL4</I> expression was decreased and <I>osphyB oscol4</I> double mutants flowered at the same time as the <I>osphyB</I> single mutants, indicating <I>OsCOL4</I> functions downstream of <I>OsphyB.</I> We also present evidence for two independent pathways through which OsPhyB controls flowering time. These pathways are: (i) night break-sensitive, which does not need <I>OsCOL4</I>; and (ii) night break-insensitive, in which <I>OsCOL4</I> functions between <I>OsphyB</I> and <I>Ehd1.</I></P>

Strong spin-phonon coupling unveiled by coherent phonon oscillations in Ca2RuO4

Lee, Min-Cheol,Kim, Choong H.,Kwak, Inho,Seo, C. W.,Sohn, Changhee,Nakamura, F.,Sow, C.,Maeno, Y.,Kim, E.-A.,Noh, T. W.,Kim, K. W. American Physical Society 2019 Physical Review B Vol.99 No.14

Transferability of Knowledge, Skills, and Abilities Along IT Career Paths: An Agency Theory Perspective

Lee, Choong Kwon,Wingreen, Stephen C. Taylor Francis 2010 JOURNAL OF ORGANIZATIONAL COMPUTING AND ELECTRONIC Vol.20 No.1

<P> Agency theory is proposed as a framework for explaining the design of IT jobs and career paths. To support this theory, data about knowledge, skills, and abilities (KSAs) were gathered and analyzed from Fortune 500 job listings for the Programmer/Analyst → Systems Analyst → IT Manager career path. The results indicate that agency theory has significant predictive power over the type and importance of IT KSAs for job sequences along IT career paths. The results have implications for both researchers who are looking for theories that explain IT job design and career path development and managers who are challenged with decisions about how to design IT jobs and manage IT career paths.</P>