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자동차용 브레이크 디스크의 부식으로 인한 마찰특성의 변화에 대한 연구
한재민(Jaemin Han),조근형(Keun Hyung Cho),장호(Ho Jang),김성진(Seong Jin Kim),이재영(Jae-Young Lee),박현달(Hyun-Dal Park) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.11
Corrosion tests of discs were carried out in an environmental chamber, simulating in-vehicle situation, and torque variation during braking was measured using a single-end brake dynamometer. A friction model was introduced to confirm the pattern of torque variation. Ingredients in a friction material were substituted to series of springs and dashpots in this model. The velocity of the brake disc and the strength of the friction layer representing the existence of corrosion layer ware calculated as a variable. Results showed that the friction film and moisture content strongly affected the amount of corrosion. The dynamometer results also showed that the existence of the corrosion layer affected brake torque variation, and this result was confirmed by the friction model. The model showed that the amount of the torque variation increased when the corrosion layer existed and when the amount of ingredients with high stiffness increased at the fixed velocity. This suggested that the strength of corrosion layer and the transition of iron oxide particles were crucial factors for the corrosion induced torque variation.
주파수 가간섭성을 이용한 피드백을 사용하는 하향 링크 OFDMA 시스템에서의 동적 자원 할당 방법
한재민(Jaemin Han),오은성(Eunsung Oh),한승엽(Seungyoup Han),주형식(Hyungsik Ju),홍대식(Daesik Hong) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
In this paper, we propose a new DCA (Dynamic Channel Allocation) in DL (Downlink) OFDMA (Orthogonal Frequency Division Multiple Access). The proposed DCA scheme exploits each user"s coherence bandwidth in a multi-path environment, resulting in the better multi-user diversity performance than the amplitude craving greedy (ACG) method and Modified ACG (M-ACG) with the reduced feedback overhead.
한재민(Jaemin Han),김재영(Jaeyoung Kim) 한국인터넷전자상거래학회 2015 인터넷전자상거래연구 Vol.15 No.1
The complexity of business relationship has been increased as information technology continuously developed. Because of this, business organization must propose sophisticated values to the customer through the analysis of customer needs, business operation, and market competition. The network operator as a business model tries to overcome limitation of structural and behavior perspectives in traditional network theories. In this paper, the concept of network operator offers explanation of comprehensive view based on systematic approach. Through case study, iPhone entered smart phone industry with an earth-break brand in 2007. After a few years, iPhone becomes a market leader who creates tremendous revenue to compare with competitors through a network operator business model. The iPhone captured latent business opportunity in competition fixation and market governance in telecommunication industry satisfying customer desires of data communication. Therefore, the iPhone business model converts business opportunity as revenue taking role as a network operator. The network operator business model provides a conceptual establishment to understand change of competitive environment which IT development brought. Network operator business model explains how business organization achieve strategic value in competition environment which regards issues that who brings what values to whom and how to generate revenue in terms of network operation perspectives.
기업의 소셜미디어 활용방안에 대한 연구 : 트위터를 중심으로
이재남(Jae-Nam Lee),변유진(Eujean Byun),한재민(Jaemin Han) 한국IT서비스학회 2011 한국IT서비스학회지 Vol.10 No.4
As the number of smart phone users increases, many organizations begin to adopt social media rapidly to diversify communication channels with customers. Specifically, twitter, which supports instant and two-way communications between users and between organizations and users, has been adopted by many organizations as an efficient way not only to identify new customers but also to retain existing customers. However, little attention has been given to the issue on how organizations can effectively use twitter to improve customer satisfaction. To explore the issue, this study proposes two major dimensions, customer participation and organization resource utilization, which should be considered in building a utilization strategy for twitter in organizations. We then develop four different combinations along with these dimensions-follow, mention, retweet, and review types. Based on case studies of 27 organizations that use twitter, we evaluate the degrees of customer participation, resource utilization, and customer satisfaction, and examine matching or mismatching of the adoption purpose of twitter and its actual utilization. The study results reveal that organizations in the matching group show higher customer satisfaction that those in the mismatching group. This study sheds new light on twitter research by developing a new conceptual framework and using a case study approach to explore the relationship between the utilization strategy of twitter and customer satisfaction.