조우제 교수

Here, quasi-two-dimensional semiconductor nanoplatelets (NPLs) have garnered widespread interest because of their uniquely narrow emission spectra and favorable characteristics for optical gain and lasing.(1–5) Strongly quantum confined along thickness, NPLs exhibit the electronic structure of quantum wells determined by their thickness, which can be controlled with atomic precision.(6–10) Among all semiconductor NPLs, CdSe NPLs are probably the most studied. So far, four kinds of CdSe NPLs, emi

This paper presents a methodological framework for IT project selection that focuses on the impact of synergy enhancement on portfolio return and risk. As the size of firms' IT investments continues to increase, the demand for strong methodologies for IT portfolio selection has been increasing. Using the mean-variance efficient frontier as a tool to balance portfolio return and portfolio risk, we develop a model for IT portfolio selection. Unlike existing IT portfolio selection models, in this f

The Internet of Things (IoT) interconnects Internet and end device networks connected by identification information, which not only extends and explores the range of the Internet, but also constructs bridges of communication between realistic objects and the Internet. With increasing awareness about the energy crisis, the development of intelligent energy-saving systems has become a new trend in all circles. This work proposes an appliance-aware activity recognition mechanism for an IoT energy m

Group III nitrides are of great technological importance for electronic devices. These materials have been widely manufactured <i>via</i> high-temperature methods such as physical vapor transport (PVT), chemical vapor deposition (CVD), and hydride vapor phase epitaxy (HVPE). The preparation of group III nitrides by colloidal synthesis methods would provide significant advantages in the form of optical tunability <i>via</i> size and shape control and enable cost reductions through scalable soluti

The objective of this study is twofold: 1) to investigate an impact of software quality attributes of a learning management system (LMS) on students' satisfaction in both the personal computer and the smartphone settings; 2) to examine whether LMS quality factors have different impacts in the smartphone context and the PC context. We explore five quality attributes of LMS (capability, usability, performance, reliability and documentation). Data from a survey of 193 students were analysed using o

This paper proposes a framework of IT portfolio selection and examines the impact of IT synergy on a firm’s IT portfolio selection. IT resources can be distinguished from other forms of resources by their great potential of enhancing synergy between IT units. Based on prior discussion on types of IT synergy, we classify IT synergy into three types and examine the effects of the different types of IT synergy on the IT portfolio selection. We found that firms of moderate and high risk tolerance

This paper provides a methodological framework in which the problem of IT project portfolio selection is solved by balancing between operational and strategic IT investments. From interviews with CIOs, we found that the interest in IT projects in many firms tends to center on operational benefits, rather than strategic benefits. We examined the impact of strategic IT investments from an IT portfolio perspective. We applied an optimization model for the IT the portfolio selection and developed a

hough innovation is considered to be the lifeblood of business, speed of innovation is more critical than innovation itself. IT plays a critical role in the process of open innovation as it is based upon collaborating with suppliers and customers. IT enables increased collaboration and generation of insights across the firm’s partner network. We examine the role of IT-enabled capabilities in determining the speed of innovation. We hypothesize that collaboration with customers is more effective t

전 세계적으로 기업의 중요한 전략적 수단으로 인수합병이 활발히 이루어지고 있고, 지능형 서비스 산업을 포함한 정보기술 산업에서의 인수합병 활동은 꾸준히 활발하게 진행되고 있다. 본 논문에서는 정보기술 산업 내에서 일어나는 인수합병 건에 대해 인수 기업 입장에서의 인수 의도에 초점을 두고 분석하였다. 특히, 두 하드웨어 기업 간, 하드웨어 기업 소프트웨어 기업 간, 두 소프트웨어 기업 간 인수합병 유형에 따라 인수 의도가 어떻게 다른지 비교하고자 하였고, 이를 위해 미국 정보기술 산업 내에서 1995년과 2010년 사이에 일어났던 1003개의 인수합병 건의 자료를 분석하였다. 인수 의도를 파악하는데 있어, 인수 기업의 입장에서 생산비용 절감 의도, 제품 개발 및 개선 의도, 고객층 확장 의도, 고객채널 확장 의도의 네 가지로 구분하여 측정하였다. 분석 결과 생산비용 절감 의도와 고객층 확장 의도는 하드웨어 기업이 피인수 기업일 때 더 많이 나타났고, 제품개발 의도는 하드웨어 기업이 인

Previous research gives a relatively incomplete picture of understanding project success by focusing on user and developer viewpoints separately. In this paper, we aim to bridge this gap by simultaneously examining developer and user perceptions while adopting the generic framework of software development models. Specifically, we empirically study the effect of user participation, software complexity, and software scope on three principle project success criteria: development time, development c

본 연구는 빅데이터를 이용하여 코로나 19 전·후의 캠핑의 트랜드 변화를 분석하고자 하였다. 온라인상에서 직접 텍스트마이닝을 통한 빅데이터 분석이 가능한 텍스톰(Textom)을 이용하여 국내의 대표적인 포털사이트인 네이버와 다음의 뉴스, 블로그, 까페 그리고 구글의 페이스북에서 ‘캠핑’을 주제어로 한 데이터를 수집하였다. 수집된 데이터를 단어빈도분석과 TF-IDF 분석을 실시한 결과로부터 코로나 19 이전 1년 동안과 이후 1년 동안 사이의 캠핑의 변화된 트랜드를 확인하였다. 분석 결과 코로나 19 이전에 단어빈도분석시 41위, TF-IDF 분석시 36위였던 차박이 코로나 19이후에는 단어빈도분석시 8위, TF-IDF 분석시 7위로 단어의 검색량이 급격하게 증가하였음을 알 수 있었다. 이를 기초로 코로나 19 이후 1년 동안에 대하여 ‘차박’을 키워드로 하여 텍스톰을 이용하여 텍스트 마이닝을 실시하여 단어빈도분석, TF-IDF 분석, 그리고 UCINET6.0과 Netdraw를 이용하