• KSII Transactions on Internet and Information Systems (TIIS)
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• 제2권2호
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• pp.63-81
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• 2008

WiMAX has been introduced as a competitive alternative for metropolitan broadband wireless access technologies. It is connection oriented and it can provide very high data rates, large service coverage, and flexible quality of services (QoS). Due to the large number of connections and flexible QoS supported by WiMAX, the uplink access in WiMAX networks is very challenging since the medium access control (MAC) protocol must efficiently manage the bandwidth and related channel allocations. In this paper, we propose and investigate a cost-effective WiMAX bandwidth management scheme, named the WiMAX partial sharing scheme (WPSS), in order to provide good QoS while achieving better bandwidth utilization and network throughput. The proposed bandwidth management scheme is compared with a simple but inefficient scheme, named the WiMAX complete sharing scheme (WCPS). A maximum entropy (ME) based analytical model (MEAM) is proposed for the performance evaluation of the two bandwidth management schemes. The reason for using MEAM for the performance evaluation is that MEAM can efficiently model a large-scale system in which the number of stations or connections is generally very high, while the traditional simulation and analytical (e.g., Markov models) approaches cannot perform well due to the high computation complexity. We model the bandwidth management scheme as a queuing network model (QNM) that consists of interacting multiclass queues for different service classes. Closed form expressions for the state and blocking probability distributions are derived for those schemes. Simulation results verify the MEAM numerical results and show that WPSS can significantly improve the network’s performance compared to WCPS.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2001년도 학술대회지
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• pp.363-368
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• 2001

전반적인 경기 침체와 이에 따른 치열한 경쟁을 겪고 있는 건설업체는 인력에 대한 의존도가 높고 지식의 형식화가 어려운 특성을 고려하여 조직차원에서 체계적으로 지식을 창출·공유·활용할 수 있는 지식경영을 도입하여 고부가가치 영역으로 진출하려 노력하고 있다. 그러나 건설업의 특성을 반영한 조직문화차원에서의 접근이 제대로 이루어지지 않아 이에 문제점이 발생하고 있다. 이는 지식경영을 위해서 개인 및 조직 자체를 변화시켜야 하는 요구를 전략적인 차원에서 접근하지 않고 제도적인 측면에서 접근한 것으로 인식되며, 이에 대한 해결책으로서 본 논문은 건설업 지식 경영 도입 기반으로서 학습조직 구축방안을 제시한다. 그리고 제시된 구축방안을 IIAC(인천국제공항공사)의 조직변화 과정에 적용해봄으로써 건설업에 지식경영을 도입하여 학습조직을 하나의 기반으로서 구축할 때의 시사점을 도출하여 국내 건설업의 경쟁력 향상에 도움이 되고자 한다.

• 한국콘텐츠학회논문지
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• 제12권11호
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• pp.368-376
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• 2012

전통적으로 미디어 시장은 사업자수가 적고 특정 미디어의 영향력이 크기 때문에 시장집중을 엄격하게 규제하여 왔다. 하지만 미디어에 개방형 인터넷이 도입됨에 따라 미디어 규제의 근거인 희소성과 침투성 개념이 약해지고 있다. 본 연구는 미디어 융합 환경에서 기존 시장집중 규제의 문제점을 비판적으로 평가한다. 개방형 콘텐츠 유통구조에서 시장성과는 시장구조보다 사업자행위에 더 영향을 받으며, 수직결합이 서비스 혁신의 수단으로 부각되고 있고, 시장획정이 끊임없이 변하기 때문에 시장집중 측정이 어려워지고 있다. 따라서 시장집중은 단순히 사업자의 시장점유율과 같은 구조적 요인으로만 규제할 것이 아니라 시장 비효율과 다양성을 저해하는 사업자 행위를 중심으로 규제하는 것이 더 적합하다는 결론이다.

• 무역상무연구
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• 제61권
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• pp.327-358
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• 2014

During the past decade after entering the World Trade Organization (WTO), China has quickened its integration into the global economy while its foreign trade has been further invigorated. On the 10th anniversary of China's accession to the WTO, the Chinese government issues White Paper to give a comprehensive introduction to China's foreign trade development. Through this paper, the Chinese government introduces I. Historic Progress in China's Foreign Trade II. Reform of and Improvements to China's Foreign Trade System III. The Development of China's Foreign Trade Contributes to the World Economy IV. Promoting Basically Balanced Growth of Foreign Trade V. Constructing All-round Economic and Trade Partnerships with Mutually Beneficial Cooperation VI. Realizing Sustainable Development of Foreign Trade. At present, the underlying impact of the international financial crisis, the protracted, arduous and complicated nature of the world economic recovery is manifesting itself, and the global economic structure and trade layout face in-depth readjustment. China will make new adjustments to its foreign trade, in an effort to turn foreign trade from scale expansion to quality and profit improvement, and from mainly relying on its low-cost advantage to enhancing its comprehensive competitive edge, thereby turning China from a big trading country to a strong trading power. China's foreign trade is still hampered by many uncertainties and is bound to meet new difficulties and challenges. During the 12th Five-year Plan period China will open itself wider to the outside world as a driver for further reform, development and innovation, make full use of its advantages, strengthen international cooperation in all respects. And at the same time China integrate itself into the world economy on a wider scale and at a higher level. China is willing to work with its trading partners to cope with the various challenges facing the world economy and trade, and promote its foreign trade to realize a more balanced, coordinated and sustainable development, and share prosperity and mutually beneficial results with its trading partners.

• 한국경제지리학회지
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• 제18권2호
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• pp.190-205
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• 2015

지식경제 하에서 국가 및 지역의 경제발전과 경쟁력을 위해서는 과학기술의 기반을 유지하고 지속적인 연구개발을 통한 혁신이 중요하다. 이런 맥락에서 새로운 지식 및 기술을 창출하고 확산시키는 기관으로서 대학의 역할이 과거 그 어느 때보다 강조되고 있다. 이 연구는 산학협력, 특히 대학과 외부 기관 간의 기술이전 및 지식교환의 양상을 파악하고, 대학의 기술이전이 지역과 지역 소재 기업들의 혁신과 경쟁우위를 확보하는데 얼마나 영향을 미치는지를 설명해 보고자 한다. 전남대학교의 기술이전, 특히 대학의 구성원이 창출한 특허 지식 및 기술의 사업화에 의거하여 살펴본 사례 분석의 결과는 전남대학교가 창출한 지식과 기술의 많은 부분이 대학 소재 지역인 광주 및 전남 지역으로 이전되고 있으며, 따라서 대학의 기술이전이 지역경제에 일정부분 영향을 미치고 있음을 확인할 수 있다.

• Journal of Information Technology Applications and Management
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• 제16권1호
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• pp.137-148
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• 2009

Knowledge management becomes the key point for organizations to survive and maintain competitive advantages in the knowledge economy era. E-learning plays a vital role for the organizational learning. How to share the experience of knowledge and the success of the knowledge management has great connection with the organizational culture. This study focuses on the factors of effective E-learning as well as its relation to the organizational culture. A successful e-learning system should not only aim at different statistical variables but emphasize on : course contents, variety of teaching methods and establishes a stable network environment. A stable E-learning platform and speedy bandwidth is a must to achieve the non-barrier communication and built an interactive learning environment. To achieve success in E-learning, it is not necessary to divide the organizational culture to strengthen the course content multiplication and plans the E-learning supervisory work by the sole responsibility unit. It should establish an ample teaching frequency width and platform and also must establish the appropriate study network frequency width and hardware equipment to achieve the best E-learning effect. The interaction in different organizational culture in adapting E-learning, those Ad-hoc and Marketing Culture, are mostly influence by the external environment and have more interactive content. Those in Clan and Hierarchy Culture are affected by traditional conception and lack of interaction. Meanwhile, under the cost consideration, Clan and Ad-hoc Culture on the dynamic side prefer to spend more cost on E-Learning while the stable side, Hierarchy and Marketing culture are willing to pay more expenses on E-Learning.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2007년도 정기학술발표대회 논문집
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• pp.234-238
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• 2007

플랜트 산업은 종합적인 사업으로 관련산업의 파급효과가 크며 고부가가치사업인 반면, 기술력을 갖추기 위해서는 장기간에 걸친 투자가 필요하며, 업계 공동 혹은 국가적인 차원에서 플랜트 산업의 장기 발전전략을 수립하여 지속적으로 추진할 필요가 있다. 플랜트 산업의 해외 수주현황 및 성공요인을 공유할 수 있는 시스템의 구축이 필요한 실정이다. 이에 본 연구는 산업설비 중 해외 플랜트 산업을 주축으로 사례조사를 실시, 특성요인의 통계적 분석을 실시하였으며, 향후 플랜트 산업의 기술력 향상을 위한 방법의 일환으로 D/B(Data Base)구축을 위한 기초자료로 사용하기위해 연구를 수행하고자 한다.

• Journal of Pharmaceutical Investigation
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• 제28권1호
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• pp.25-33
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• 1998

Intestinal absorption of ${\beta}-lactam$ antibiotics and angiotensin converting enzyme(ACE) inhibitors has been shown to use the carrier-mediated transport system. In vitro experiments have established that the efficacy of uptake by enterocytes depends on an inwardly directed proton gradient. It was suggested that benazepril was mediated by tripeptide transport system and that amoxicillin was transported by dipeptide transport carrier. The aim of this study is to assess the influence of amoxicillin on the intestinal absorption of benazepril using in vitro diffusion chamber and in situ single pass perfusion technique in the rat in order to elucidate whether the above transport systems are competitive or not. We obtained the gastrointestinal pemeability coefficient of amoxicillin, benazepril and both of them using in vitro diffusion chamber. And also the gastrointestinal absorption clearance of amoxicillin, benazepril and both of them using in situ single-pass perfusion method at steady state were calculated. Amoxicillin and benazepril were analyzed by HPLC. The results by the use of diffusion chamber in vitro indicated that the apparent intestinal permeability coefficient of benazepril was significantly(p<0.01) decreased by amoxicillin(45.2%) and vice versa significantly(p<0.01) decreased(89.1%). The results by the in situ gastrointestinal single-pass perfusion method indicated that the intestinal absorption clearance of benazepril was significantly(p<0.05) decreased by amoxicillin (40.2%) and vice versa significantly(p<0.05) decreased(54.8%). These results might suggest that they share the same peptide carrier pathway for oral absorption.

• 한국산학기술학회논문지
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• 제12권7호
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• pp.2963-2968
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• 2011

플라스틱 사출 제품은 다양한 가전제품과 하이테크 제품에 널리 사용되고 있다. 그러나 플라스틱 사출 제품 제조업자들은 고객을 만족시키면서 경쟁력을 얻기 위하여 다른 경쟁자들보다 먼저 새로운 제품을 시장에 출시하고 신제품의 개발기간을 줄이기 위한 노력을 할 여유가 부족하다. 따라서 무한 경쟁의 시장에서 살아남기 위해서는 제조업자들은 시장 마켓 점유를 빠르게 올리는 것과 동시에 제품의 가격 경쟁력을 가져야 한다. 본 연구에서는 하이브리드 인공신경망과 유전자 알고리즘을 이용한 특징기반 플라스틱 사출제품의 비용 평가 모델을 제안한다. 제안하는 방법은 기존의 플라스틱 사출제품의 비용평가절차와 계산을 위해 필요로 하는 변수들을 극적으로 간단하게 하고 줄일 수 있다. 사례연구는 제안하는 모델이 플라스틱 사출 제품의 개발단계에서의 비용평가문제를 해결하는데 효율성과 효과성이 있음을 입증한다.

• STI Policy Review
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• 제8권2호
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• pp.75-93
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• 2017

Recently, global competition in the manufacturing sector is driving firms in the manufacturing sector to conduct product innovation projects to maintain their competitive edge. The key points of product innovation projects are 1) what the purpose of the project is and 2) what expected results in the target market can be achieved by implementing the innovation. Therefore, this study focuses on the performance of innovation projects with a business viewpoint. In this respect, this study proposes the "achievement rate" of product innovation projects as a measurement of project performance. Then, this study finds the best strategies from various innovation activities to optimize the achievement rate of product innovation projects. There are three major innovation activities for the projects, including three types of R&D activities: Internal, joint and external R&D, and five types of non-R&D activities - acquisition of machines, equipment and software, purchasing external knowledge, job education and training, market research and design. This study applies decision tree modeling, a kind of data-mining methodology, to explore effective innovation activities. This study employs the data from the 'Korean Innovation Survey (KIS) 2014: Manufacturing Sector.' The KIS 2014 gathered information about innovation activities in the manufacturing sector over three years (2011-2013). This study gives some practical implication for managing the activities. First, innovation activities that increased the achievement rate of product diversification projects included a combination of market research, new product design, and job training. Second, our results show that a combination of internal R&D, job training and training, and market research increases the project achievement most for the replacement of outdated products. Third, new market creation or extension of market share indicates that launching replacement products and continuously upgrading products are most important.