• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.8
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• pp.1804-1810
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• 2013

In this paper, we study the opportunistic cooperation scheme that improves the outage performance through the efficient selection between a cooperative mode and a non-cooperative mode. Especially, in decode-and-forward relaying systems, we analyze the outage performance for the opportunistic cooperation using partial relay selection, where closed-form expressions of exact and asymptotic outage probabilities are derived assuming independent and identically distributed Rayleigh fading channels. In the numerical results, we verify the derived expressions, and investigate the outage performances for various target data rates and different numbers of relays. Also, we compare the outage performances of the conventional cooperation scheme and the opportunistic cooperation scheme.

• The Magazine for Energy Service Companies
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• s.68
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• pp.28-29
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• 2011

2013년부터 본격적인 성과보증계약방식의 도입에 따라 ESCO 산업은 성과보증 계약방식으로 전환하게 됨에 따라 위기와 기회를 동시에 맞이하게 되었다. 따라서 이제부터 성과보증방식으로 가려면 ESCO기업의 책임있는 자세가 더욱 필요하게 되었다. 이번에 전주대학교 산학협력단 조성환 교수가 추진한 ESCO산업 발전 방향 연구용역과 관련한 인터뷰를 통해 각 업체에서 준비해야 할 부분과, 2011년 ESCO산업에 대해 전망해보고자 한다.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.10 no.2
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• pp.27-42
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• 2015

The aim of this research is to investigate the difference in the capturing opportunities for each type of venture companies in the industry undergoing competition of a dominant design and then figure out the reason why they can be successful. Existing studies on venture companies are focused on the way to enhance a firm's competencies by acquiring and combining its resources. However, it is important for startups which have a lack of resources and capabilities to capture the opportunity to survive by understanding a changing environment. This study is focused on opportunity capture and strategic response to a changing environment and attempts to select and observe startup companies which are able to capture the opportunity and enter the market in the industry undergoing dominant design competition. In order to find out its difference in different types of business, we select one case from hardware startups and the other from software startups. According to the result of this study, the hardware startup focuses on market extension by lowering their prices and the software startup strives to induce more users to participate by the universalization of enabling technology so as to extend and standardize their technology in the environment undergoing dominant design competition. This feature of environment leads the difference in the approach for successfully capturing opportunity and thus hardware firms need to recognize the opportunity with profit potential from relationship with a number of cooperative firms while software firms need to identify the opportunity for extension of enabling technology which can be used by many users.

• 한국정보교육학회:학술대회논문집
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• 2006.08a
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• pp.231-243
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• 2006

웹 커뮤니티 기반 온 오프라인 연계 자기주도 학습모형은 일반적으로 전통적인 면대면 교육방식이 갖고 있던 시간과 공간상의 제약 및 상호작용성의 한계를 극복하려던 e-Learning의 노력에서 한 걸음 더 나아가, e-Learning 교육 방식에 전통적인 면대면 교육방식이 갖고 있는 교육적 장점을 결합, 적절히 활용함으로써 학습효과를 극대화하기 위한 학습전략-소위 Blended Learning이다. 이에 이 논문에서는 교실이라는 제한된 범위를 넘어 다른 지역, 다른 학습자끼리 공동 관심사항에 대해 각기 자료를 검색하고, 취합하여 결과물을 공유하는 시스템을 적용하였다. 이 연구는 많은 사람들과의 연계를 통해 지기주도적 상호작용을 활성화한다는 점 이외에도 전문가 집단의 도움을 쉽게 받을 수 있으며 서로 다른 환경과 문화에 대해 통찰할 수 있는 기회를 제공해 준다는 점에서 의의가 있다.

• The Journal of the Korea Contents Association
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• v.17 no.12
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• pp.505-515
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• 2017

As animation industry continues to evolve in China, the demand for excellent manpower is on the increase. However, there is a difficulty in cultivating practical talents because many colleges and universities in China do not have the systematized animation education. This study compares the curriculum for animation major in Korea and China in order to find out the major problems and the improvement plans of animation education in China. It was shown that the curriculum in China mainly consisted of the subjects to learn technical skills and lacked the subjects to enhance students' creativity. Especially, universities in China did not offer the practice environment in which students apply and utilize what they learned. As a result, students had less opportunity to experience creative process of making animation. In order to solve these problems, it is necessary to make the balanced basic curriculum, link the practice courses with the creativity courses, develop the specialized learning methods and provide the training opportunities through industry-university cooperation. The results of this study suggest that good quality animation education is an important element for universities and animation industry to continue to prosper together.

• Journal of The Korean Association For Science Education
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• v.39 no.1
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• pp.1-12
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• 2019

This study aims to explore students' epistemic practices and considerations, which are explained as underlying epistemic thoughts that guide their epistemic practices, during argumentation in science classrooms. We also investigated how collaborative reflection facilitated the development of such epistemic considerations. Two seventh-grade classes participated in this study by engaging in argumentation activities and collaborative reflection after classes. A group with students' change in epistemic aspects and the influence of collaborative reflection clearly revealed from their practices was chosen as a focus group. We recorded their class discussions and collaborative reflections with the researchers. Transcriptions of the recordings and checklists we collected during the collaborative reflections were used for analysis. Results showed evident changes in the students' epistemic considerations and practices and four factors facilitating such developments were identified. First, the researcher facilitating the students to recognize each other as collaborators during collaborative reflection led development of epistemic considerations on "audience using the knowledge products." Second, the collaborative reflection facilitated construction of context for peer interactions where the students encouraged each other to participate in the discussion, resulting in the development of other students' epistemic considerations on "justifications in knowledge products." Third, the items provided on the checklists explicitly delineated expectations on their practices in argumentation, also facilitating development of epistemic considerations. Lastly, the students' imitation of the researcher's pattern of discourse facilitated construction of causal explanation and development of epistemic considerations on "nature of the knowledge products." This study will contribute to the construction of strategies that develop students' epistemic considerations and productive epistemic practices in argumentation.

• Journal of Internet Computing and Services
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• v.12 no.4
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• pp.35-43
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• 2011

Cognitive Radio (CR) ad hoc network is highly considered as one of promising future ad hoc networks, which enables opportunistic access to under-utilized licensed spectrum. Similarly to other CR networks, the spectrum sensing is a prerequisite in CR ad hoc network. Collaborative spectrum sensing can help increasing sensing performance. For such an infrastructureless network, however the coordination for the sensing collaboration is really complicated due to the lack of a central controller. In this paper, we propose a novel collaborative spectrum sensing scheme in which the final decision is made by the node with the highest data reliability based on a sequential Dempster Shafer theory. The collaboration of sensing data is also executed by the proposed contention-aware reporting mechanism which utilizes the sensing data reliability order for broadcasting spectrum sensing result. The proposed method reduces the collecting time and the overhead of the control channel due to the efficiency of the ordered sequential combination while keeping the same sensing performance in comparison with the conventional cooperative centralized spectrum sensing scheme.

• KIISE Transactions on Computing Practices
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• v.21 no.11
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• pp.739-744
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• 2015

In this paper, we examine the project-based educational practice that is co-developing a solution to the local food inventory management system. This project is aimed at the practical business of IT distribution in small and medium industries, and is linked with the project course on undergraduate students of IT division. For the practical project of the IT distribution in small and medium industries, an employee in charge of the project participates as a mentor such that he presents the project subject and the students develop the system for the subject. This system emerges from existing theory and the necessity for a term project, and this course leads students to learn practical knowledge through discussion with the employee in charge. Through this course, the latest technology is shared mutually, and students have the opportunity to understand a domain of the IT distribution business. As students experience how to understand and solve cost, quality and delivery time for the project by themselves, they build confidence. Also, the company can save on costs for the development of prototypes, while creating an opportunity for students to experience working with seasoned staff.

• Information and Communications Magazine
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• v.25 no.11
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• pp.48-52
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• 2008

기술혁신은 끝없이 지속적, 반복적으로 발생하지만, 최근의 기술혁신은 자체적인 혁신의 한계에 직면하고 있는 것처럼 보여진다. 국가경제의 발전은 개별적으로 진행되어 온 기술혁신에 크게 의존하지만, 이제 개별적인 혁신의 한계를 극복하기 위하여 이종간 기술 및 산업융합이 활발하게 모색되고 있다. 융합이라는 새로운 환경은 개별적인 기술이나 산업에 다양한 기회와 위험을 제공하게 될 것이다. 융합이라는 것이 단지 하나의 영역에 머무르는 개념이 아니라 여러 분야에 걸쳐서 대단히 광범위한 영역에서 발생하게 될 것이라는 점에서 그렇다. 이미 초기적인 융합의 현상들은 도처에서 발견되고 있으며, 이제 이를 더욱 확대 발전시키고 심화시켜 나가기 위한 노력들이 진행중이다. 융합을 가속화시키고 심화시켜 나가는데 필요한 요인은 무엇일까? 다양한 방법과 수단들이 거론될 수 있겠지만, 융합 발생의 광역성이라는 측면에서 개인의 창의력이 대단히 중요하다. 제한적인 인간의 역량으로 모든 분야에서 창의력을 발현한다는 것은 쉽지 않기 때문이다. 이러한 관점에서 우리나라 전체 기업의 대다수를 차지하는 중소기업의 역할은 대단히 중요하다. 국민소득 3만불 이상을 달성하기 위해서는 대기업과 중소기업의 육성을 위하여 다양한 정책을 입안하고 집행하여 왔지만, 중소기업의 경쟁력은 아직도 취약한 것이 회피할 수 없는 현실이다. 개인의 역량과 창의력 발현이 중시되는 융합환경에서 중소기업 육성을 위한 정책은 기존의 물적자원 중심의 지원방식과는 달리 다양한 협력네트워크의 구축과 네트워크 기반의 정보 공유 및 활용을 위한 방향으로 전환될 필요가 있다. 정보의 공유와 활용을 통하여 창의적인 아이디어의 발현이 더욱 확대되고 심화될 수 있기 때문이다.

• Journal of KIISE
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• v.43 no.1
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• pp.119-125
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• 2016

Cognitive radio technology can allow secondary users (SUs) to access unused licensed spectrums in an opportunistic manner without interfering with primary users (PUs). Spectrum sensing is a key technology for cognitive radio (CR). However, few studies have examined energy-efficient spectrum sensing in cognitive radio sensor networks (CRSNs). In this paper, we propose an energy-efficient cooperative spectrum sensing nodes selection scheme for cluster-based cognitive radio sensor networks. In our proposed scheme, false alarm probability and energy consumption are considered to minimize the number of spectrum sensing nodes in a cluster. Simulation results show that by applying the proposed scheme, spectrum sensing efficiency is improved with a decreased number of spectrum sensing nodes. Furthermore, network energy efficiency is guaranteed and network lifetime is substantially prolonged.