• Journal of Global Scholars of Marketing Science
• /
• v.15 no.2
• /
• pp.227-244
• /
• 2005

This case examined the strategy of taking back a market leader in Korea Internet shopping mall through free book delivery service of Interpark. Although lnterpark was an oldest Internet shopping mall in Korea, its market position has been weaken and weaken due to strong challengers based on TV Home shopping companies. In order to overcome the difficult situation, Interpark chose the book division as a bowling alley. The company offered boldly a free delivery service of book for customers. The free delivery service was considered as a risky bating because it cost a lot. However, it led more customer traffic to Interpark and cross-selling of other categories. At last Interpark took back a market leader based on free book delivery service. The case showed it was very important for e-business company to analyze market and competitors and to implement bold strategies at high speed.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.16 no.10
• /
• pp.1890-1899
• /
• 1992

In bonded structures, there are V-notched cracks in dissimilar materials and the stress concentration of these V-notched cracks causes to occur interface cracks in dissimilar materials Therefore the strength evaluation of V-notched cracks in dissimliar materials seems to be important. The stress fields of a V-notched cracks is known as .sigma.$_{ij}$ .var. K $r_{p-1}$,where K is the stress intensity factor and p-1 is the stress singularity. When the distance, r, approaches to 0 at the stress fields of V-notched cracks, the stresses become infinites by two more stress singularities of p-1 and p-1 is no more -0.5. Stress singularities and stress intensity factors for V-notched cracks in dissimilar materials are treated and discussed. The Newton-Raphson method which is an efficient numerical method for solving a non-linear equation is used for solving stress sigularities. And stress intensity factors are solved by the collocation method using the Newton-Raphson and least squares method. The effects of stress intensity factors and stress singularities on stress fields of V-notched cracks in dissimilar materials are studied by using photoelasic isochromatic frings patterns obtained from computer graphics.s.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2001.05a
• /
• pp.591-596
• /
• 2001

Many consumption goods, most notably in network markets including the telecommunications industry, exhibit network externalities. For that reason, standardization is the tore Issue in network markets with powerful positive feedback. firms in the telecommunications industry compete intensively against one another to build on early lead due to w inertia and network externalities. Therefore, a firm's strategies err very important in standards competition. In this paper, we'll examine the patterns of standards competition and cooperation, anti a variety of firms' strategies in the telecommunications industry. And then, we'll examine the trend of the change from standard competition to standard cooperation. After that, we'll suggest the national policies for the preemption.

• The KIPS Transactions:PartC
• /
• v.16C no.6
• /
• pp.737-746
• /
• 2009

Given the increased interest in ubiquitous computing, wireless sensor network has been researched widely. The localization service which provides the location information of mobile user, is one of important service provided by sensor network. Many methods to obtain the location information of mobile user have been proposed. However, these methods were developed for only one mobile user so that it is hard to extend for multiple mobile users. If multiple mobile users start the localization process concurrently, there could be interference of beacon or ultrasound that each mobile user transmits. In the paper, we propose APL(Adaptive Power Control based Resource Allocation Technique for Efficient Localization Technique), the localization technique for multiple mobile nodes based on adaptive power control in mobile wireless sensor networks. In APL, collision of localization between sensor nodes is prevented by forcing the mobile node to get the permission of localization from anchor nodes. For this, we use RTS(Ready To Send) packet type for localization initiation by mobile node and CTS(Clear To Send) packet type for localization grant by anchor node. NTS(Not To Send) packet type is used to reject localization by anchor node for interference avoidance and STS(Start To Send) for synchronization between 모anchor nodes. At last, the power level of sensor node is controled adaptively to minimize the affected area. The experimental result shows that the number of interference between nodes are increased in proportion to the number of mobile nodes and APL provides efficient localization.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.14 no.6
• /
• pp.1493-1504
• /
• 2010

The localization service which provides the location information of mobile user, is one of important service provided by sensor network. Many methods to obtain the location information of mobile user have been proposed. However, these methods were developed for only one mobile user so that it is hard to extend for multiple mobile users. If multiple mobile users start the localization process concurrently, there could be interference of beacon or ultrasound that each mobile user transmits. In the paper, we propose LME, the localization technique for multiple mobile nodes in mobile wireless sensor networks. In LME, collision of localization between sensor nodes is prevented by forcing the mobile node to get the permission of localization from anchor nodes. For this, we use CTS packet type for localization initiation by mobile node and RTS packet type for localization grant by anchor node. NTS packet type is uevento reject localization by anchor node for interference avoidance.nghe experimental result shows that the number of interference between nodes are increased in proportion to the number of mobile nodes and LME provides efficient localization.

• The Magazine for Energy Service Companies
• /
• s.57
• /
• pp.32-35
• /
• 2009

세계는 지금 녹색시장을 선점하기 위한 ‘Green Race’가 치열하게 전개되고 있다. EU, 일본 등 선진국은 자원고갈과 환경위기를 새로운 성장동력 창출의 기회로 전환하기 위해 녹색기술 개발 및 녹색산업의 육성에 모든 국력을 집중하고 있다. 우리나라도 현재 이 대열에 동참하기 위해 ‘저탄소 녹색성장’같은 혁신과 정책 바람이 불고 있는 중이다.

• 정보화사회
• /
• s.180
• /
• pp.22-24
• /
• 2006

올 모바일 시장의 최대 화두는 HSDPA로 판단된다. WCDMA 서비스 침체가 장기화되고 있는 시점에서 HSDPA는 WCDMA 서비스 뿐 아니라 모바일 서비스 자체를 견인할 '핵'으로 각광받고 있다. 이에 따라 관련 업체들은 '솔루션' 출시를 앞다퉈 선언하며 시장 선점에 나서고 있다. 한 발 앞서 내딛는 발걸음이 향후 열 발 앞선 행보로 이어질 수 있다는 판단에서이다. 그들의 움직임을 추적했다.

• 정보화사회
• /
• s.182
• /
• pp.6-7
• /
• 2006

유무선 통합 서비스가 통신 업계를 뒤흔들고 있다. 오래 전부터 소리 소문 없이 유무선 통합 서비스 논의는 계속 있어 왔지만, 올해들어 본격적인 도입 움직임이 일고 있다. 영국 BT를 시작으로 프랑스텔레콤이 불을 당겨 유럽은 이미 FMC 중심에 위치했다. 국내에서도 LG텔레콤의 '기분존' 서비스가 인기를 누리면서 FMC에대한 관심이 부쩍 높아졌다. 이에 따라 단말기 업체들도 시장 선점을 위해 잇따라 제품을 선보이고 있다. 바야흐로 유선과 무선의 경계가 허물어지고 있는 것이다.

• Digital Contents
• /
• no.3 s.118
• /
• pp.60-79
• /
• 2003

세계는 지금 그간 구축한 IT를 기반으로 하는 디지털콘텐츠 시장선점을 위한 물밑 경쟁이 치열하게 전개되고 있다. 우리나라 역시 초고속인터넷의 확산, 최초의 IMT-2000 서비스 실시, 디지털방송 실시 등으로 IT인프라는 세계 최고 수준에 올랐으나 디지털콘텐츠 분야만큼은 이제 막 개발이 본격화되고 있는 시점이다. 이에따라 정부는 국내 디지털콘텐츠 산업을 세계적인 수준으로 도약시키기 위한 비전과 전략을 제시하고 범정부적 차원에서 종합계획을 수립, 추진하고 있다.

• Digital Contents
• /
• no.7 s.146
• /
• pp.22-27
• /
• 2005

게임의 패러다임이 2D에서 3D로 변화하면서 모바일게임 시장도 대규모 지각변동 조짐이 뚜렷해지고 있다. 그동안 모바일게임 업계와 유선 게임업계간의 분명한 구분이 있었는데 최근 이러한 영토구분이 허물어지고 있다. 모바일게임 업계와 유선 게임업계간의 제휴 및 독자적인 3D게임 개발 등 3D 모바일게임 시장을 차기 수익원으로 판단, 업체마다 고강도의 시장 대응전략을 마련 중이다.