이동통신산업 가치네트워크 구성요인 규명과 성과분석

이성휘(Lee Seong Hwi),허훈(Hur Hun),이명호(Lee Myoungho),송두한(Song Dohan) 한국통신학회 2013 한국통신학회 학술대회논문집 Vol.2013 No.6

가상성과 성과의 관계에 대한 다 수준 모델 제안

이도한(Dohan Lee),백기복(Ki-Bok Baik) 대한경영학회 2021 大韓經營學會誌 Vol.34 No.12

정보통신 기술의 발전과 함께 확대되어온 가상팀은 팬데믹 발생 이후 일반화된 근무 형태로 자리매김하는 모습을 보이고 있으며 팬데믹 이후에도 확대될 것이라고 예상된다. 중요한 것은 가상팀은 확대되고 있으나 가상성에 대한 이해가 피상적인 수준에 머무르고 있다는 점이다. 따라서 본 연구는 가상성에 대한 보다 깊은 이해를 제공하기 위하여 가상성이 성과에 영향을 미치는 경로를 다 수준에서 살펴보았다. 구체적으로, 개인수준에서 가상성이 구성원에게 미치는 심리적 영향과 그 영향에 의한 성과의 변동을 설명하였고 팀/조직 수준에서 팀 가상성과 신뢰 풍토의 조절 효과 제안을 통하여 가상성과 성과의 관계를 다 수준에서 설명하는 모델을 제시하였다. 본 연구는 가상성과 성과 사이에서 심리적 거리라는 매개 변수의 존재와 그 역할에 주목하면서 크게 두 부분으로 나뉘는데, 전반부는 가상성의 영향으로 발생하는 심리적 거리에 초점을 맞췄다. 이 과정에서 개인 가상성과 팀 가상성을 구분하여 팀 가상성의 조절 효과를 제시했는데 개인 가상성과 팀 가상성의 상호 작용이 심리적 거리에 영향을 준다고 봤다. 후반부는 가상성으로 발생하는 심리적 거리가 팀 성과에 영향을 미치는 과정을 설명한다. 심리적 거리는 개인에게 불확실성을 경험하게 하는데 개인이 불확실성을 경험하면 그것을 해소하기 위한 동기가 촉발된다. 이 과정에서 신뢰가 심리적 거리와 상호작용하여 팀 성과에 영향을 미친다고 봤다. 기존의 가상성 연구에서 신뢰를 조절변수로 사용한 적이 있지만, 가상성이 높아지면 대면 기회가 적어 신뢰의 변동(variation)을 직접 관찰, 측정하기 어렵다. 오히려 공간적으로 떨어져 있는 경우에는 공유된 지각인 “신뢰 풍토”를 조절변수로 활용하는 것이 바람직하다고 봤다. 연구 결과는 가상성에 대한 검토를 토대로 몇 가지 중요한 시사점을 제안한다. 먼저, 가상성에 대한 다 수준 접근을 통하여 개인 가상성과 팀 가상성의 역할을 구분하여 제시하였다. 둘째, 가상성이 성과에 영향을 주는 과정에서 심리적 거리의 매개 역할과 심리적 거리가 성과에 영향을 주는 과정이 불확실성을 통하여 이루어진다는 것을 제시하였다. 셋째, 심리적 거리가 팀 성과에 영향을 주는 과정에서 신뢰 풍토의 조절 효과를 제시하였다. 본 연구는 가상성을 개인 수준 또는 팀 수준 하나에 국한하여 설명하는 기존 연구의 한계를 극복하기 위해서 다 수준에서 가상성과 성과의 관계를 설명하려는 시도이다. Virtual team which has expanded with the advancement of IT technology is settled as a generalized work form since the outbreak of COVID-19 pandemic, and it is expected that it will expand after the pandemic. What is important is that the virtual team is expanding; however, the understanding of virtuality remains at superficial level. Therefore, in order to provide a deeper understanding of virtuality, this study examined the relationship between virtuality and performance at multi-level. Specially, this study explained virtuality and performance at multi-level through the psychological effect of virtuality on members and change in performance at individual level. And the proposal of the moderation effect of team virtuality and trust climate at team/organization level. This study paid attention to the existence and role of the variable, psychological distance between virtuality and performance. This study is divided broadly into two parts, and the first half is concerned with psychological distance affected by virtuality. In this process, individual virtuality and team virtuality were classified and the moderating effect of team virtuality was presented, and the interaction between individual virtuality and team virtuality was considered to affect psychological distance. The second half is a process in which psychological distance caused by virtuality affects team performance. Psychological distance makes individuals experience uncertainty, and when an individual experiences uncertainty, a motivation to resolve it is triggered. In this process, trust interacts with psychological distance and affects team performance. Though trust has been used as a moderator in existing virtuality studies, it is difficult to directly observe and measure the variation of trust due to fewer face-to-face contacts when virtuality increases. Rather, if spatially separated, it is reasonable to use the shared perception, “trust climate,” as a moderator. The results of this study suggest several important implications based on a review of virtuality. First, the roles of individual virtuality and team virtuality were proposed separately through a multi-level approach to virtuality. Second, it was suggested that in the process of virtuality affecting performance, the mediating role of psychological distance and the process of psychological distance affecting performance are performed through uncertainty. Third, the moderation effect of the trust climate was proposed in the process of psychological distance that affects team performance. This study is to explain the relationship between virtuality and performance at multi-level to overcome the limitation of the preceding studies that explain virtuality only either at individual or team level. This perspective allows a multidimensional view of the issue of virtuality in organizational management. The limitations of the study and future research directions were discussed.

Testing an Empirical Model for the Value Network of the Mobile Communication Industry in Korea

Hoon Huh,Dohan Song,Sung Hwee Lee 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.2

The mobile communication industry evolves into a mobile communication industry ecosystem led by new keystone players (i.e., Apple and Google) and reflects the expansion of overall industrial competitiveness in size through conversion with other businesses. In this study, the modeling was done in a systematic method to derive the answers to the questions such as, which functions in the value chains of mobile communication industry contribute most to profit creation, what is the key resource, and what the new business model is. This study attempts to objectively identify derivation of factors and correlations between the configuration factors for competitiveness expansion for each industry. Specifically, we developed a dynamic model to predict the overall industry movement by theoretically establishing the modelling concept about value networking of the mobile communication industry ecosystem. Using the system dynamics methodology, coupled with professional interviews, this paper empirically tests the value network model that reflects open mobile communication ecosystem. The results show that the ecosystem of the mobile communication industry is evolving into an open form with the surfacing of portals and terminal production companies, suggesting the collapse of the traditional structure (Walled Garden).

THE EXTENSION OF SOLUTIONS FOR THE CAUCHY PROBLEM IN THE COMPLEX DOMAIN

Lee, Eun-Gu,Kim, Dohan Korean Mathematical Society 1989 대한수학회보 Vol.26 No.2

In [4], J. Leray introduced the notion of partial hyperbolicity to characterize the operators for which the non-characteristic Cauchy problem is solvable in the Geverey class for any data which are holomorphic in a part of variables x"=(x$_{2}$,..,x$_{l}$ ) in the initial hyperplane x$_{1}$=0. A linear partial differential operator is called partially hyperbolic modulo the linear subvarieties S:x"=constant if the equation P$_{m}$(x, .zeta.$_{1}$, .xi.')=0 for .zeta.$_{1}$ has only real roots when .xi.'is real and .xi."=0, where P$_{m}$ is the principal symbol of pp. Limiting to the case of operators with constant coefficients, A. Kaneko proposed a new sharper condition when S is a hyperplane [3]. In this paper, we generalize this condition to the case of general linear subvariety S and show that it is sufficient for the solvability of Cauchy problem for the hyperfunction Cauchy data which contains variables parallel to S as holomorphic parameters.blem for the hyperfunction Cauchy data which contains variables parallel to S as holomorphic parameters.

A Soluble Diketopyrrolopyrrole Derivative and Its Applications for Organic Phototransistors

Lee, Chulyeon,Kim, Joonwoo,Moon, Yejin,Kim, Dohan,Song, Dong-Ik,Kim, Hwajeong,Kim, Youngkyoo Wiley (John WileySons) 2018 ASIAN JOURNAL OF ORGANIC CHEMISTRY Vol.7 No.11

THE EXTENSION OF SOLUTIONS FOR THE CAUCHY PROBLEM IN THE COMPLEX DOMAIN II

Lee, Eun-Gu,Kim, Dohan Korean Mathematical Society 1993 대한수학회보 Vol.30 No.1

J. Leray [7] proposed a sufficient condition ofr the solvability of the Cauchy problem on the initial hyperplane x$_{1}$=0 with Cauchy data which are holomorphic with respect to the variables parallel to some analytic subvariety S of the initial hyperplane. Limiting the problem to the case of operators with constant coefficients, A. Kaneko [2] proposed a new sharper sufficient condition. Later we generalized this condition and showed that it is necessary and sufficient for the solvability of the Cauchy problem for the hyperfunction Cauchy data and the distribution Cauchy data which contain variables parallel to S as holomorphic parameters in [5, 6]. In this paper, we extend the results in [6] to the case of operators with variable coefficients and show that it is sufficient for the solvability of the Cauchy problem for the hyperfunction Cauchy data. Our main theorem can be considered as an example of a deep theorem on micro-hyperbolic systems by Kashiwara-Schapira [4] and we give a direct proof based on an elementary sweeping out procedure developed in Kaneko [3].

Growth and Characterization of a Multi-dimensional ZnO Hybrid Structure on a Glass Substrate by using Metal Organic Chemical Vapor Deposition

김대식,Dohan Lee,Je-Haeng Lee,변동진 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.10

A multi-dimensional zinc oxide (ZnO) hybrid structure was successfully grown on a glass substrateby using metal organic chemical vapor deposition (MOCVD). The ZnO hybrid structure wascomposed of nanorods grown continuously on the ZnO film without any catalysts. The growthmode could be changed from a two-dimensional (2D) film to one-dimensional (1D) nanorods bysimply controlling the substrate’s temperature. The ZnO with a hybrid structure showed improvedelectrical and optical properties. The ZnO hybrid structure grown by using MOCVD has excellentpotential for applications in opto-electronic devices and solar cells as anti-reflection coatings(ARCs), transparent conductive oxides (TCOs) and transparent thin-film transistors (TTFTs).

A parametric study of nanoparticle synthesis by the thermal plasma processing

Cheongbin Cheon,Dohan Kim,Hae June Lee 한국진공학회 2020 한국진공학회 학술발표회초록집 Vol.2020 No.2

A SIMPLE PROOF OF BOCHER'S THEOREM

Chung, Soon Yeong,Kim, Dohan,Lee, Eun Gu 대한수학회 1995 대한수학회보 Vol.32 No.1

한국인 복지태도의 변화양상 -집단중심 다중궤적모형의 적용-

김사현 ( Kim Sahyun ),황동진 ( Hwang Dongjin ),이민서 ( Lee Minseo ),김도한 ( Kim Dohan ) 한국사회복지정책학회 2021 사회복지정책 Vol.48 No.1

이 연구는 한국인 복지태도의 변화양상을 탐색한 것이다. 특별히 연구는 복지태도를 다차원적 관점에서 5가지 복지정책 관련 쟁점(불평등, 정부지출, 보편성, 정책평가, 증세)에 대한 태도로 규정하고, 동시에 변화의 양상을 공유하는 여러 집단들을 도출하는 보다 포괄적인 접근 전략을 취했다. 분석을 위해 한국복지패널조사의 복지인식 부가조사 8차, 11차, 14차년도 자료가 활용되었고, 집단중심 다중궤적모형(Group-based Multi-trajectory Model) 분석이 이루어졌다. 그 결과 변화양상이 상이한 집단은 4개, 곧 ‘선별확대군(48.7%)’, ‘확대반대군(25.7%)’, ‘비용회피군 (18.9%)’, ‘적극확대군(6.7%)’으로 식별되었다. 각 집단은 태도의 변화가 관찰되지만 개별 정책쟁점에 대한 초기값 차이를 일정 정도 유지한 채 안정적으로 변화하는 양상을 보였다. 한편, 각 집단에 속할 확률은 인구사회학적 특성과 정치적 이념에 따라 뚜렷한 차이를 보임으로써 한국사회 구성원들의 복지태도 역시 복지정책에 대한 이해관계를 따라 사회적으로 구조화되어 있음을 확인할 수 있었다. The purpose of this research is to explores changes of Korean welfare attitude using the group-based multi-trajectory model. For research, this research took a more comprehensive approach strategy by defining the welfare attitude as five types of attitudes towards welfare policies(inequality, government expenditure, universality, policy evaluation, tax increase) based on the multi-dimensional perspective, and also drawing many groups sharing the aspect of change at the same time. For the analysis, this study utilized the 8th, 11th, and the 14th-year additional research data of Korea Welfare Panel Study, by conducting the group-based multi-trajectory model analysis. In the results, there were four groups with different trajectory of change such as ‘selective expansion group(48.7%)’, ‘expansion opposition group(25.7%)’, ‘expense avoidance group(18.9%)’, and ‘active expansion group(6.7%)’. The differences of attitude in each group in relation to the five policy-level issues were stably maintained. Also, the probability belonging to each group showed such distinct differences according to the demographic characteristics and political ideology, which verified that the welfare attitude of Korean society members was also socially structured according to the interests of welfare policies.