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조남욱,안재경,김지표,홍정식,Cho Nam-Wook,Ahn Jac-Kyoung,Kim Ji-Pyo,Hong Jung-Sik 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.7B
본 연구에서는 무선 LAN 시장의 새로운 돌파구로 기대되는 VoWLAN의 투자 수익률 분석을 위해 구체적이고 실용적인 방법론을 제시하고자 한다. 이를 위하여 먼저 국내외 VoWLAN 시장의 동향을 분석한다. 다음으로는 투자수익률 분석을 위해 구축유형에 따라 VoWLAN에의 비용항목과 VoWLAN과 경쟁하는 대안서비스(유선랜과 유선전화서비스)의 비용항목을 산정한 후 대안서버스와 비교한 VoWLAN의 혜택 항목과 투자수익률 분석 시 필요한 기타 입력항목을 선정한다. 또한, 대상 기업의 다양한 상황에 맞는 구축 시나리오를 제시하고 각 시나리오 별로 비용/혜택 분석 프레임워크에 따라 경제성 분석을 실시한다. 본 연구에서는 개발된 투자 수익률 분석 프레임워크의 유용성을 검증하기 위해 VBA 프로그램으로 구현하여 실제 사례에 적용한다. Voice over Wireless LAN (VoWLAN) is defined as a communication service which transmits voice over wireless LAN. Due to its capability of providing high quality service while reducing communication costs, the VoWLAN is expected to be widely introduced to hospitals, hotels, and many more industry sectors. However, despite the increased interest in the new service, there has been limited research on the economic assessment of deploying VoWLAN. This paper provides a systematic and quantitative approach to the return on investment (ROI) analysis of VoWLAN service. We first analyze the domestic and international market trend of VoWLAN. Then, implementing scenarios of VoWLAN and corresponding alternatives are established. For each scenario, cost and benefit analysis is conducted. The proposed framework is implemented by using VBA program. To validate the result of the analysis, a case study is also conducted.
조남욱 ( Nam Wook Cho ) 대한설비관리학회 2003 대한설비관리학회지 Vol.8 No.2
N/A To meet the increasing needs for precision products while maintaining a low cost, a systematic tolerance analysis tool for size and geometric tolerance during the design stage of a product is essential. However, despite the importance of tolerance analysis, the development of tolerance analysis methodologies has been stagnant mainly due to the complexity of geometric tolerance. To overcome the difficulty of geometric tolerance analysis, this paper first develops a geometric tolerance analysis framework using Virtual Manufacturing techniques. Major components of the framework are identified and their functions are defined. Then, the framework is applied to the geometric tolerance analysis problem of precision machine tool spindle assemblies. As a result, a guideline of geometric tolerances for spindle design is suggested.
조남욱 ( Nam-wook Cho ),김종화 ( Jonghwa Kim ),안재경 ( Jaekyung Ahn ) 한국경영공학회 2012 한국경영공학회지 Vol.17 No.3
An OBP(On Board Processing) satellite is a new generation of satellite, which has higher transmission rate and covers wider area than existing satellites. Due to its improved functionality, An OBP satellite can provide variety of new satellite communication services such as fill-in service, UHDTV, and high precision GPS. In spite of its versatility, as the development of an OBP satellite incurs huge investment, economic justification of OBP satellite development is crucial. This paper presents an economic assessment of OBP satellite development. First, feasible services of an OBP satellite have been identified and the Willingness-To-Pay (WTP) for the identified services have been estimated. Then, R&D and operating costs of the OBP satellite have been estimated. To facilitate valid economic analysis, this paper presents three different scenarios and economic assessment has been conducted under each scenario.
분광분석을 통한 우레탄샌드위치패널의 난연성능 현장평가방법 연구
조남욱(Cho Nam-Wook),이동호(Rie Dong-Ho),신현준(Shin Hyun-Jun) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.7
Polyurethane Foam (PUR) is used as insulation, frame and buffer of cold storage because of excellent insulation, construct, process and adhesion performance. However, it can emit deadly toxic gas in case of fire which can cause massive casualties. Recently the product in urethane that Polyisocyanurate Foam is used as sandwich panel core, improved product of flame retardant performance, has been increased. But it’s not easy to distinguish the flame retardant performance between PUR and PIR at a construction site. Therefore cone-calorimeter test and gas hazard test are performed to confirm the performance of materials according to the standard set by the Ministry of Land. In this study, infrared spectroscopic analysis were performed for PIR and PUR that have similar shape to each other but different fire resistance performance. and this study tried to consonance analysis between PIR and PUR that have different infrared absorption spectrum by measuring the spectrum and statistic method. As a result, effective analysis method demonstrates what easly can be applied in site.