• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권9호
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• pp.4220-4241
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• 2017

For the downlink energy-harvesting small cell network, this paper proposes an interference management algorithm based on distributed coalitional game. The cooperative interference management problem of the energy-harvesting small cells is modeled as a coalitional game with transfer utility. Based on the energy harvesting strategy of the small cells, the time sharing mode of the small cells in the same coalition is determined, and an optimization model is constructed to maximize the total system rate of the energy-harvesting small cells. Using the distributed algorithm for coalition formation proposed in this paper, the stable coalition structure, optimal time sharing strategy and optimal power distribution are found to maximize the total utility of the small cell system. The performance of the proposed algorithm is discussed and analyzed finally, and it is proved that this algorithm can converge to a stable coalition structure with reasonable complexity. The simulations show that the total system rate of the proposed algorithm is superior to that of the non-cooperative algorithm in the case of dense deployment of small cells, and the proposed algorithm can converge quickly.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.728-729
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• 2015

As environmental issues have been increased globally, eco-friendliness in the construction area, which accounts for more than 30% of total GHG gas emission has being urged. In response, the Korean government has implemented G-SEED(Green Standard for Energy and Environmental Design) certification from 2002. However, total number of certified apartment buildings is only around 1% of total number of approved apartment buildings. As a basic research to find out reasons of low rate of the certification, this paper analyzes consumers' decision-making process in G-SEED certified apartment building market comparing to non G-SEED certified one and draw System Dynamics modeling based on causal relationship. As a result, consumers' demand for the certified one is increased by 'Perceived Relative Utility' which is resulted from comparison process with non-certified one. The 'Perceived Relative Utility' is ascended upward steadily by 'Relative Perceived Price' considered as relatively short-term effect and 'Favorable Image of Certified Housing' referred to long-term effect.

• 경영정보학연구
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• 제7권2호
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• pp.213-228
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• 2005

본 연구는 최근 기업들이 도입하고 있는 정보시스템의 아웃소싱 전략과 그 사례를 조사하였다. 전통적인 아웃소싱 방법은 기업에게 실질적인 이익을 충분히 가져다주고 있지 못하다. 이에 현실적으로 좀 더 기업에게 이익이 되는 적극적인 아웃소싱 방법론으로서 "유틸리티 컴퓨팅"의 개념에 기초한 적극적인 아웃소싱 방법론이 제시되고 있다. 이에 이러한 아웃소싱 전략을 채택한 한 기업의 사례를 통해서 그 내용을 알아보도록 하자. 이를 위해 정보시스템 아웃소싱을 정의해보고, 신 개념인 IBM사의 유틸리티 컴퓨팅 개념의 Value Net Service(VNS) 를 알아보며, 이를 채택한 한글라스 그룹의 사례를 살펴보도록 한다. 한글라스 그룹에서의 사례를 통해 과연 유틸리티 컴퓨팅에 입각한 정보 인프라의 아웃소싱이 어떠한 결과를 낳았고, 그 성과 및 문제점은 어떤 것들이 있는지도 살펴보도록 한다. 본 논문이 한글라스와 같은 전략을 채택할 기업들에게 좋은 사례가 될 수 있을 것으로 기대한다.

• 대한한방소아과학회지
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• 제34권4호
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• pp.1-10
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• 2020

Objectives The purpose of this study is to evaluate the satisfaction and utility of a clinical training in Pediatrics of Korean Medicine after conducting participatory practices in clinical training. Methods A survey was conducted with 46 students who completed a clinical training in 2019. After completing Problem Based Learning (PBL), Objective Structured Clinical Examination (OSCE) and Clinical Performance Examination (CPX), they filled out the questionnaire composed of 15 questions. In addition, it was required to rank the preferences for clinical training items and describe what was good about, things that need to be improved or corrected, and other areas to be implemented as a part of the clinical training. Results 1. Mean of the total satisfaction score was 4.26. Mean satisfaction score of the educational method was 4.25, and mean score of the utility of educational effectiveness was 4.27. 2. Among the questions that evaluate satisfaction of the education program, 'I agree with OSCE as a part of the clinical training for juniors.' showed the highest score. Among the questions that evaluate utility of educational effectiveness, 'It will be helpful to treat patients as a Korean Medicine doctor in the future' showed the highest score. On the other hand, 'I actively participated in the clinical training' showed the lowest score. Conclusions A clinical training in Pediatrics of Korean Medicine can be highly valued from the viewpoint of the satisfaction and its utility.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 1999년도 춘계공동학술대회:정보화시대의 지식경영
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• pp.426-426
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• 1999

;There are many sources of uncertainty in a typical production and inventory system. There is uncertainty as to how many items customers will demand during the next day, week, month, or year. There is uncertainty about delivery times of the product. Uncertainty exacts a toll from management in a variety of ways. A spurt in a demand or a delay in production may lead to stockouts, with the potential for lost revenue and customer dissatisfaction. Firms typically hold inventory to provide protection against uncertainty. A cushion of inventory on hand allows management to face unexpected demands or delays in delivery with a reduced chance of incurring a stockout. The proposed strategies are used for the design of a probabilistic inventory system. In the traditional approach to the design of an inventory system, the goal is to find the best setting of various inventory control policy parameters such as the re-order level, review period, order quantity, etc. which would minimize the total inventory cost. The goals of the analysis need to be defined, so that robustness becomes an important design criterion. Moreover, one has to conceptualize and identify appropriate noise variables. There are two main goals for the inventory policy design. One is to minimize the average inventory cost and the stockouts. The other is to the variability for the average inventory cost and the stockouts The total average inventory cost is the sum of three components: the ordering cost, the holding cost, and the shortage costs. The shortage costs include the cost of the lost sales, cost of loss of goodwill, cost of customer dissatisfaction, etc. The noise factors for this design problem are identified to be: the mean demand rate and the mean lead time. Both the demand and the lead time are assumed to be normal random variables. Thus robustness for this inventory system is interpreted as insensitivity of the average inventory cost and the stockout to uncontrollable fluctuations in the mean demand rate and mean lead time. To make this inventory system for robustness, the concept of utility theory will be used. Utility theory is an analytical method for making a decision concerning an action to take, given a set of multiple criteria upon which the decision is to be based. Utility theory is appropriate for design having different scale such as demand rate and lead time since utility theory represents different scale across decision making attributes with zero to one ranks, higher preference modeled with a higher rank. Using utility theory, three design strategies, such as distance strategy, response strategy, and priority-based strategy. for the robust inventory system will be developed.loped.

• 농촌의학ㆍ지역보건
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• 제36권2호
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• pp.120-129
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• 2011

목적: 뇌졸중으로 인한 장애인이 증가하고 있으나 이들을 대상으로 질보정수명을 구한 연구가 없었다. 이 연구의 목적은 일개 시에서 뇌졸중 장애인을 대상으로 EQ-5D로 그들의 건강 관련 삶의 질 수준을 평가하고, 우리나라 전체 뇌졸중 장애인의 QALYs 감소분을 추정하기 위하여 수행 하였다. 방법: 2008년 3월을 기준으로 경주시 장애인 등록현황에서 50세 이상인 장애인 중 뇌졸중이 원인으로 파악된 982명을 대상으로 설문조사자들이 방문하여 대면면접조사를 통해 일반적 특성, 임상적 특성, EQ-5D 등의 자료를 수집하였다. 제4기 국민건강영양조사 에서 일반인구집단과 동반질환이 없는 군을 건강비교군으로 선정하여 성별, 연령별 표준화를 통해 비교함으로써 효용 가중치 차이를 구하였다. 이 효용 가중치 차이를 우리나라 전체 뇌졸중 장애인에 적용하여 전체 QALYs 감소분을 추정하였다. 결과: 대상자 982명 중 조사응답자는 566명으로 응답률은 57.6%였다. 여성, 70대 이상군에서 EQ-5D 지표값이 남성이나 60대 이하군에 비해 더 낮았고, 상대 비교군과의 차이도 크게 나타났다. 건강비교군과 일반인구집단 비교군과의 비교에 따른 전체 QALYs 감소분은 각각 연간 67,011.6 QALYs와 54,167.1 QALYs로 추정되었다. 결론: EQ-5D로 우리나라 전체 뇌졸중장애인의 QALYs 감소분을 추정하였고, 이 연구를 바탕으로 뇌졸중 장애인을 대상으로 한 공중보건정책의 집행이나 평가를 수행하여 보다 근거에 기반한 장애인 정책을 수행할 수 있을 것으로 생각한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제3권6호
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• pp.575-596
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• 2009

Facing limited network resources such as bandwidth and processing capability, the Internet will have congestion from time to time. In this paper, we propose a scheme to maximize the total utility offered by the network to the end user during congested times. We believe the only way to achieve our goal is to make the scheme application-aware, that is, to take advantage of the characteristics of the application. To make our scheme scalable, it is designed to be class-based. Traffic from applications with similar characteristics is classified into the same class. We adopted the RED queue management mechanism to adaptively control the traffic belonging to the same class. To achieve the optimal utility, the traffic belonging to different classes should be controlled differently. By adjusting link bandwidth assignments of different classes, the scheme can achieve the goal and adapt to the changes of dynamical incoming traffic. We use the control theoretical approach to analyze our scheme. In this paper, we focus on optimizing the control on two types of traffic flows: TCP and Simple UDP (SUDP, modeling audio or video applications based on UDP). We derive the differential equations to model the dynamics of SUDP traffic flows and drive stability conditions for the system with both SUDP and TCP traffic flows. In our study, we also find analytical results on the TCP traffic stable point are not accurate, so we derived new formulas on the TCP traffic stable point. We verified the proposed scheme with extensive NS2 simulations.

• Asian Pacific Journal of Cancer Prevention
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• 제15권16호
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• pp.6919-6922
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• 2014

Background: The cytological analysis of serous effusions is a common investigation and yields important diagnostic information. However, the distinction of reactive mesothelial cells from malignant cells can sometimes be difficult for the cytopathologist. Hence cost-effective ancillary methods are essential to enhance the accuracy of cytological diagnosis. The aim of this study was to examine the utility of nuclear morphometry in differentiating reactive mesothelial cells from malignant cells in effusion smears. Materials and Methods: Sixty effusion smears consisting of 30 effusions cytologically classified as malignant (adenocarcinomas) and 30 benign effusions showing reactive mesothelial cells were included in the study. ImageJ was used to measure the nuclear area, perimeter, maximal feret diameter, minimal feret diameter and the circularity. A total of ten representative cells were studied in each case. Results: Significant differences were found between benign and malignant effusions for the nuclear area, perimeter, maximal feret diameter and minimal feret diameter. No significant difference was found for circularity, a shape descriptor. Receiver operating characteristic (ROC) curve analysis revealed that nuclear area, perimeter, maximal feret diameter, and minimal feret diameter are helpful in discriminating benign and malignant effusions. Conclusions: Computerised nuclear morphometry is a helpful ancillary technique to distinguish benign and malignant effusions. ImageJ is an excellent cost effective tool with potential diagnostic utility in effusion cytology.

• 한국지역사회생활과학회지
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• 제22권3호
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• pp.327-339
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• 2011

This study aims to investigate relationships between benefit sought and selection attributes of green tea consumers. For data collection, a total of 595 copies of questionnaires were collected by convenience sampling in the Seoul and Gyeonggi-do area. The data were analyzed by using SPSS 15.0. The factor analysis identified four dimensions of the benefit sought : health benefit, sensory, sociality, and self-esteem. Six dimensions of selection attributes were identified as manufacturing, design, sensory appeal, recommendation, utility and brand. The results of the canonical correlation analysis indicated that health benefit, sensory, sociality of benefit sought and manufacturing, design, sensory appeal, recommendation, utility, brand of selection attributes were highly correlated, and the self-esteem of benefit sought and recommendation of selection attribute were highly correlated. This means it is important to place an emphasis on safety production, package design, sensory characteristics, product description, utility and brand for consumers who seek health benefit, flavor and sociality. It is also important to place an emphasis on product description for consumers who pursue self-esteem benefits. Green tea marketers should consider benefit sought aspects as the most important factors affecting selection attributes on green tea purchasing.

• 전력전자학회논문지
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• 제14권5호
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• pp.415-422
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• 2009

본 논문은 기존의 시스템에 비해 시스템의 전력회로 구조의 큰 변경 없이 밧데리와 같은 전력저장 장치 디바이스의 추가와 개선된 운용방법을 적용한 첨두부하 삭감효과를 갖는 계통연계형 태양광발전시스템(UIPV)을 제안하였다. 개선된 운용방법과 에너지 저장장치의 추가로 기존 시스템에 비해 PV-array 용량을 작게 설치하여도 첨두부하 삭감효과를 크게 할 수 있으며, 가격 및 설치공간 등의 면에서 평가하여 기존시스템보다 더 나아짐을 확인하였다.