• Journal of applied mathematics & informatics
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• 제5권3호
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• pp.827-837
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• 1998

We consider the M/G/1 queue with instantaneous feed-back. The probabilities of feedback are determined by the state of the underlaying Markov chain. by using the supplementary variable method we derive the generating function of the number of customers in the system. In the analysis it is required to calculate the matrix equations. To solve the matrix equations we use the notion of Ex-tended Laplace Transform.

• 대한산업공학회지
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• 제16권1호
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• pp.107-114
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• 1990

A queueing system with compound Poisson arrival and server vacation is analyzed by including supplementary variables. We consider a vacation system in which the server leaves for a vacation as soon as the system empties. When he returns, if no customer is waiting for service, he waits until a group of customers arrive and then begins to serve. We obtain the system size distribution and the waiting time distribution. Additional performance measures will be also considered.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(3)
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• pp.133-136
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• 2000

In this paper, a new service architecture for IP Telephony, based on the ITU-T standard H.323［1］, is proposed. This architecture uses mobile Agents and existing architectural concepts taken from Intelligent Network［IN］. This IP service architecture enables telecom services deployed through mobile service agents on a per user basis, which results in several advantages when compared to centralized service architecture. The paper demonstrates that the flexible and extensible architecture can accommodate a wide variety of future services.

• Computers and Concrete
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• 제12권6호
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• pp.755-774
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• 2013

Considering the well known environmental issues of cement manufacturing (direct and indirect levels of $CO_2$ emissions), clinker replacement by supplementary cementing materials (SCM) can be a very promising first step in reducing considerably the associated emissions. However, such a reduction is possible up to a particular level of SCM utilization, influenced by the rate of its pozzolanic reaction. In this study a (4-step) structured methodology is proposed in order to be able to further adjust the concrete mix design of a particular SCM, in achieving additional reduction of the associated levels of $CO_2$ emissions and being at the same time accepted from a derived concrete strength and service life point of view. On this note, the aim of this study is twofold. To evaluate the environmental contribution of each concrete component and to provide the best possible mix design configuration, balanced between the principles of sustainability (low environmental cost) and durability (accepted concrete strength and service life ). It is shown that such a balance can be achieved, by utilising SCM by-products in the concrete mix, reducing in this way the fixed environmental emissions without compromising the long-term safety and durability of the structure.

• 한국치위생학회지
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• 제11권2호
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• pp.159-167
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• 2011

Objectives : The purpose of this study was to examine the satisfaction level of dental hygienists with supplementary education. The subjects in this study were 305 dental hygienists, on whom a survey was conducted from September 26 to December 10, 2009. Methods : The instrument used in this study was questionnaires that consisted of three sections: educational environments, the content and method of education, and educational administration. Results : The findings of the study were as follows: 1. In terms of satisfaction level with supplementary education, they gave a mean of 3.13, which was on the average. The dental hygienists who worked in public dental clinics, who had a 10 years or more of career and who worked in the provinces expressed more satisfaction. 2. In terms of satisfaction level with educational environments, they gave a mean of 3.22. They were most gratified with lecturers(3.34), and they expressed the least satisfaction with educational opportunities(3.14). 3. In terms of satisfaction level with the content and method of education, they gave a mean of 3.15. They were most contented with the professionalism of education, and they expressed the least satisfaction with the ratio of theory and practice(2.92). 4. In terms of satisfaction level with educational administration, they gave a mean of 3.02. They were most satisfied with the application procedure(3.22), and they expressed the least satisfaction with educational cost and publicity(2.91). Conclusions : Educational institutions that provide supplementary education should reinforce small-group supplementary education for each district, provide systematic practice-centered educational programs and offer streamlined administration service to boost the satisfaction level of dental hygienists.

• 대한수학회지
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• 제42권3호
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• pp.517-527
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• 2005

This paper considers a discrete-time queueing system with variable service capacity. Using the supplementary variable method and the generating function technique, we compute the joint probability distribution of queue length and remaining service time at an arbitrary slot boundary, and also compute the distribution of the queue length at a departure time.

• 한국방사선학회논문지
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• 제12권7호
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• pp.861-868
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• 2018

본 연구는 의원에 근무하는 방사선사의 보수교육에 관한 연구로 보수교육에 대한 만족도와 문제점을 분석하여 보수교육에서 개선하여야 할 사항을 연구하기 위해 실시하였다. 연구에 사용한 도구는 설문지로 2016년 11월 01일부터 2017년 04월30일까지 경남 창원에 소재하는 의원에 근무하는 방사선사를 대상으로 교육참석 및 방문을 통한 조사로 이루어 졌으며, 설문지 총150부를 배부하여 연구에 적합한 106부를 SPSS 18.0 통계 프로그램을 이용하여 분석하였다. 인구사회학적 특성으로는 연령, 성별, 근무경력, 학력, 근무부서로 하였으며, 보수교육에 대한 만족요인으로는 제도, 주제, 도움, 강사선택의 적절성, 전문성 등, 총 21가지 요인으로 하였으며, 보수교육의 문제점으로는 장소, 교통편, 다양성, 행정처리, 홍보, 방법 등, 총18가지 요인으로 분석하였다. 보수교육에 대한 만족도 (3.02점)와 보수교육에 대한 문제점(3.18점)은 보통수준으로 보수교육에 대한 문제점이 조금 높게 분석되었다. 보수교육은 보건의료인이면 누구나 이수해야 하는 교육이며, 보수교육 이수 시간으로 3년마다 면허 재 신고를 해야 하는 주요한 교육이다. 다양한 의료기관에 근무하는 방사선사를 대상으로 하는 보수교육은 의원에 근무하는 방사선사의 교육수준에 부합하지 못하다는 의견이 많았다. 그러므로 의원방사선사의 보수교육에 대한 만족도를 높이기 위한 방안으로 보수교육에 대한 다양한 의견과 개선사항을 현실성 있는 교육 프로그램으로 반영하여, 교육의 질적 향상을 통한 보수교육에 대한 만족도를 높여야 할 것이다.

• 융합보안논문지
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• 제18권3호
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• pp.61-68
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• 2018

디지털방송 시대가 정착되면서 방송프로그램 시청에만 활용되던 TV가 다양한 데이터서비스를 운영할 수 있는 매체로 발전하였다. 이는 시청자의 TV이용 행태도 수동적인 태도에서 능동적으로 미디어를 소비하는 태도로 변화할 수 있는 환경이 마련되었음을 의미한다. 광고 시장은 매체의 변화에 따라 영향을 많이 받는 산업분야이기 때문에 이러한 변화는 광고의 제공 형태와 시청자의 광고 소비행태에 변화를 유발하게 되며, 방송 산업은 데이터서비스의 가능성을 광고시장과 연계한 새로운 성장전략을 고민할 필요가 있다. 이 에, 본 연구는 짧은 노출 시간과 정보 표현 공간 부족의 한계를 안고 있는 ID 광고를 대상으로 광고와 관련된 부가정보를 제공하는 데이터서비스를 설계하였다. 구체적으로 데이터서비스의 사용 시나리오와 사용자인터페이스를 설계하고, ID 광고의 유형별로 정의된 부가정보를 데이터서비스에 공급하는 국제 디지털방송 표준 DVB 기반의 방법을 개발하였다.

• Asian Journal of Innovation and Policy
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• 제5권2호
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• pp.185-196
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• 2016

A digital cable broadcasting service is a multimedia broadcasting service that provides high definition and various supplementary services by using digital transmission. Korea implemented a complete digital broadcasting service by 2012. This study applied a choice experiment to investigate consumer preferences, and it calculated the marginal willingness to pay for this service. Moreover, we employed a multinomial probit model to relax the assumption that all respondents have the same preference for attributes being valued. The results suggest that respondents value channels, definition, video-on-demand (VOD) service, pay-per-view (PPV) service, and commerce based on TV (T-commerce). On the other hand, online gaming may be less important as an attribute for digital cable broadcasting service in Korea.

• 한국경영정보학회:학술대회논문집
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• 한국경영정보학회 2007년도 International Conference
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• pp.141-146
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• 2007

The importance of the net-based customer service in delivering supplementary after-sale services associated with product has been well documented. The strategic advantages of a well-implemented the net-based customer service are enhanced customer loyalty and higher lock-in of customers, and the resulting reduction in competition and the consequent increase in profits. However, not all customers utilize such the net-based customer service. This is partly due to the e-commerce divide, and partly due to privacy and security concerns of the customer for sharing personal information with firms. The limited level of customer adoption of the net-based customer service affects the firm profits and the customers' welfare. We use a game-theoretic model in which we model the net-based customer service system as a mechanism to enhance customers' loyalty. We find that an increase in adoption of the net-based customer service by the customer base is not always desirable for firms. and that customers who utilize such services are better off only when the overall adoption is limited.