• 한국통신학회논문지
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• 제34권1A호
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• pp.76-83
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• 2009

본 논문에서는 OFDMA를 이용하는 시스템에서의 elastic 서비스를 위한 공평성을 고려한 opportunistic 스케줄링 기법에 대하여 연구한다. 본 논문에서는 각 유저의 만족도를 유틸리티로 정의한 후 네트워크 유틸리티 극대화 기법을 이용한다. 이러한 유틸리티는 각 유저가 이용하는 서비스에 따라 서로 다르게 정의할 수 있으며 elastic 서비스의 경우에는 평균 전송률이 높을수록 유저의 만족도가 높아지게 된다. 이를 반영하기 위하여 각 유저의 유틸리티를 평균 전송률에 대한 함수로 정의한다. 또한 각 유저 사이의 공평한 자원 배분을 위한 조건을 유저들의 유틸리티를 이용하여 정의하고 이를 만족하는 동시에 각 유저의 유틸리티의 합으로 정의되는 네트워크 유틸리티를 극대화 하기위한 opportunistic 스케줄링 기법을 연구한다. 본 논문에서는 각각의 공평성 조건에 대한 opportunistic 스케줄링 문제를 최적화 문제로 정의하고 이를 dual 기법과 stochastic sub-gradient 기법으로 풀어 스케줄링 기법을 구현하도록 한다.

• 한국정보시스템학회지:정보시스템연구
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• 제25권3호
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• pp.31-60
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• 2016

Purpose In 2016, the market size of mobile(m-) shopping goes beyeond more than half of a total of online shopping. People use smartphones as the main device for m-commerce. Under the circmustances, this study attempts to address why people prefer to use smartphone-based m-commerce. In other words, it is necessary to understand the main value that smartphone-based m-commerce creates. Drawing on the studies of consumption value, this study focuses on utilitarian value in predicting customers' continuance intention in the context of smartphone-based m-commerce, recognizing that utilitarian value is a key extrinsic motivation in the goal-oriented, performance-oriented shopping contexts. Furthermore, this study identifies factors affecting customers' utilitarian value from the perspective of benefits and costs, following the notion that it represents the result of evaluating a trade-off of benefits and costs caused by smartphone-based m commerce. More specifically, in this study, ubiquitous service, location-based service (LBS), transaction speed, and price utility belong to the benefit dimension, whereas technology anxiety and cognitive effort belong to the cost dimension. Design/methodology/approach To test the proposed hypotheses, the study conducted partial least squares (PLS) analysis with a total of 294 data collected on users with experience in smartphone-based m-commerce. Findings The results show that first, utilitarian value is increased by the benefits, such as ubiquitous service, transaction speed, and price utility. However, LBS has no direct effect on utilitarian value. Second, the noteworthy finding is that ubiquitous service and LBS greatly increase transaction speed. Third, technology anxiety and cognitive effort considered as the cost dimension are negatively associated with utilitarian value but their impacts on it are non-significant. Finally, the results support the argument that utilitarian value is a determinant of continuance intention. Overall, the findings imply that utilitarian value greatly depends on the peception on benefits rather than the aspect of cost in smartphone-based m-commerce. Overall, the findings offer new insight into the studies of m-commerce by considering and verifying the impacts of its benefits and costs simultaneously.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 컴퓨터소사이어티 추계학술대회논문집
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• pp.179-182
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• 2003

In this paper, we developed those OpenLS(Open Location Service) Core Services based on the Web-Service, because Web-Service environments provide a suitable method to gather requested information in an appropriate way. The proposed architecture cooperate with OpenLS Core Services( Directory Service, Location Utility Service and Router Determination service) and is an interoperability one - it identifies those global elements of the global Web-Services network that are required in order to ensure interoperability between Web-services. In this paper, a new architecture of OpenLS Core Services is proposed and tested in OpenLS Core Services environments.

• 한국멀티미디어학회논문지
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• 제11권12호
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• pp.1730-1738
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• 2008

Quality of Service (QoS) Guarantees grant ways for service providers to establish service differentiation among subscribers. On the other hand, service subscribers are also assured the level of service they paid for. In addition, the efficient level of service quality can be selected according to the subscribers' needs thus ensuring efficient use of available bandwidth. While network utility optimization techniques assure certain QoS metrics, a number of situations exist where some QoS goals are not met. The optimality of the network parameters is not mandatory to guarantee specified QoS levels. This paper proposes a joint data rate and power control scheme that guarantees service contract QoS level to a subscriber using Goal Programming. In using goal programming, this paper focuses on finding the range of feasible solutions as opposed to solving for the optimal. In addition, in case no feasible solution is found, an acceptable compromised solution is solved.

• 한국식품조리과학회지
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• 제19권2호
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• pp.155-164
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• 2003

The purpose of this study was to examine, in a service context, construct validity and generalizability of widely used and accepted measures of perceived organizational support, job satisfaction, organizational commitment, and service duality, and to test each measures' predictive utility in this context with path analysis. Of 350 subjects, 309 subjects participated in the analysis. Descriptive statistics (frequencies), exploratory factor analysis, reliability analysis, zero-order partial correlation analysis, and confirmatory factor analysis were used for this study. The findings from this study are as follows. First, perceived organizational support significantly influenced job satisfaction, organizational commitment. and service quality. Second, Job satisfaction had a directional impact upon organizational commitment and service quality. Third, organizational commitment showed to have a predictive impart on service quality. Finally, the results of the study provide some insight into the types of internal marketing strategies that can be applied successfully by operators of hotel F & B departments.

• 한국항만경제학회지
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• 제28권3호
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• pp.91-110
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• 2012

현대 경영학에서 지식은 기업의 경쟁력을 창출할 수 있는 새로운 전략적 자원으로서 인식되고 있다. 치열한 경쟁구도 하에 있는 해운기업 지식경영의 효용성에 주목할 필요가 있다. 해운서비스 네트워크 내외부에서 획득되는 자료와 정보, 지식을 효과적으로 분류, 공유, 이전함으로써 기업특유의 역량을 발전시킬 수 있을 것이다. 본 연구에서는 정기선사의 지식경영이 해운서비스 역량의 강화에 어떠한 영향을 미치는지를 분석하였다. 이를 위해 해운기업의 지식경영의 수준을 측정하기 위해 지식사슬모형을 설계하였으며 국적 및 외국적 선사로부터 수거한 80부의 설문지를 바탕으로 모형의 타당성과 신뢰성을 검증하였다. 실증분석 결과 지식사슬모형을 구성하는 지원활동과 주요활동이 선사의 해운서비스 역량을 강화하는데 유의적인 효과를 미치는 것으로 나타났다. 본 연구는 지식경영의 효용성이 해운산업분야에서도 적용될 수 있음을 보여주고 있으며 해운기업들이 지식의 전략적 중요성을 인식하고 전사적 차원에서 지식경영을 추구해야함을 권고하고 있다.

• 한국정보시스템학회지:정보시스템연구
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• 제13권1호
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• pp.97-119
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• 2004

Recently, many e-business companies started to charge fees to the use of information contents service. However, little is known about how users evaluate and determine to purchase information services. Past technology adoption research has focused primarily on the positive utility gains side, focusing on usefulness and ease of use. Purchase of e-service, however, involves not only the position utilities but also negative utilities. This research uses the service value model(SVM) and explains user's intention of purchasing a new information service. Based on the Perceived Value Framework, this research investigates the impacts of the service quality and the fee charge on the user's perceived service value and further on user's intention of adopting the e-service. One of the most important postulations of this research is that both service quality and the fee charge influence user's intention through affecting the user's perceived service value. This research presences a conceptual model of users' e-service evaluation process. The conceptual framework provides a basis for understanding how perceptions of quality and sacrifice influence value perceptions and purchase intentions. The results of an empirical research suggest that the both service quality and fee charge have influences on the perceived service value. However, they do not directly affect user's intention to purchase the e-service. They affect user's intention to purchase through affecting the perceived service value. In conclusion, this research provides a base to build on for other research studying use intention model of new e-service.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2009년도 춘계 종합학술대회 논문집
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• pp.797-801
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• 2009

제안된 u-health 서비스 플랫폼은 바이오 데이터 채집과 저장, 그리고 바이오 데이터 분석 및 결과 통보의 일련의 과정을 모바일u-health 서비스 프로세스로 해석하였다. 모바일 환경에서 건강관리 시스템 구축을 지원하는 서비스 플랫폼은 모바일 u-health 응용 서비스를 쉽게 탑재하여 운영할 수 있도록 설계 되었으며, 서비스 플랫폼의 효용성 및 유용성을 고려함으로써 u-health 사용 서비스의 기틀을 마련하였다.

• 한국조리학회지
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• 제7권1호
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• pp.181-202
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• 2001

Recently there is growing concern regarding the service industry in Korea, especially the food service industry. The form of food service industry has become larger and speciallized by means of either implementing marketing programme in individual companies or the entrepreneurs' possesstion of chain stores. As the food service industry has extended throughout the whole of Korea, It has contributed enormously to the regional economy. These phenomena is based on the following facts; the increase in income level, the fast economy growth and change, rapid reform of social structure, and the change in status of the labor population. To meet these changes and reforms the food service industry in Korea has to form a new ideology that takes into account the interaction with globalization, the phenomena of instant-food consumption habit, a general increase in the those who eat-out, the two faces of luxury, and the blending of domestic extravagance and practicality, especially the influence of imported brands on advance technology and system utility on the economic section and style as a whole.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.1233-1238
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• 2007

In recently, our social is entering to service infinite competitive time., So If companys don't give satifactory and an impression customers, they don't exist. The Companies that operate railway are promoted(Seoul metro). The Korail, Seol metropolitan Rapid Transit Corperation, Incheon Rapid Transit Corporation), they are into a stronger competitor. So the service for customer is more inportant to improve the image and administration than before. Especially, station workers who work near the customer are important for cooperation image. But, there are only a few employees to operate the station like ticketing in railway station, There aren't reinforcement the service employees and expanse the utility system. especially, since the transportation card is introduced in 1996, the customers who use the T-Money card are increased. So the change of service system is necessary to provide a substantial service to customer. This paper derives the problems through analysising the operating system of station, and presents the improvement to provide substantial services to customer