• Journal of Information Processing Systems
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• 제17권2호
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• pp.297-305
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• 2021

Large amount of data is being generated in gaming servers due to the increase in the number of users and the variety of game services being provided. In particular, load balancing schemes for gaming servers are crucial consideration. The existing literature proposes algorithms that distribute loads in servers by mostly concentrating on load balancing and cooperative offloading. However, many proposed schemes impose heavy restrictions and assumptions, and such a limited service classification method is not enough to satisfy the wide range of service requirements. We propose a load balancing agent that combines the dynamic allocation programming method, a type of greedy algorithm, and proximal policy optimization, a reinforcement learning. Also, we compare performances of our proposed scheme and those of a scheme from previous literature, ProGreGA, by running a simulation.

• 정보보호학회논문지
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• 제18권6B호
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• pp.259-269
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• 2008

Applying Varying Pseudonym (VP) to design of Radio Frequency Identification (RFID) authentication protocol outperforms the other existing approaches in several respects. However, this approach is prone to the well-known denial-ofservice (DOS) attack. In this paper, we examine the de-synchronization problems of VP-based RFID authentication protocols, and propose effective solutions to eliminate such weaknesses. We shall show that the proposed solutions indeed improve the security for these protocols, and moreover, these solutions require 0(1) computational cost for identitying a tag and 0(1) key space on the tag. These excellent performances make them very attractive to many RFID applications.

• 경영정보학연구
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• 제8권3호
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• pp.175-200
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• 2006

애플리케이션 아웃소싱의 새로운 형태로 등장하고 있는 ASP 모델은 정보시스템을 자체적으로 개발하여 운영할 인력과 전문성이 부족한 중소기업에 적합하다. 그러나 ASP 모델에 대한 연구는 부족한 실정이다. 서비스품질은 ASP 핵심성공요인 가운데 하나로 거론되고 있지만 아직 ASP 서비스 품질을 측정하기 위한 타당한 도구가 개발되지 않고 있다. 따라서 본 연구에서는 마케팅 분야에서 서비스품질을 측정하기 위한 도구로 개발된 SERVQUAL을 응용하여 ASP 서비스 품질 측정 모델을 개발하여 실증분석을 수행하였다. 본 연구의 표본은 "소기업 네트워크화 사업"에 참여하고 있는 소기업 가운데 무작위로 300개 기업을 선정하여 방문조사를 통해 240개의 설문지를 수거했다. 그리고 이러한 조사자료를 분석한 결과 신뢰성과 유형성은 다른 어떤 서비스품질 구성요인보다도 사용자 개인성과 및 만족도에 유의한 영향을 미치는 것으로 나타났다.

• 한국산업보건학회지
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• 제29권2호
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• pp.217-225
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• 2019

Objectives: The aim of this study is to evaluate the quality management systems of domestic asbestos survey and monitoring service providers and the relationships with the number of licenses or designations and sales performances. Methods: Data on quality management systems were collected by assessors who were assigned by the Korea Occupational Safety and Health Agency(KOSHA) during a pilot evaluation program for designated asbestos survey and monitoring service providers in 2016 using evaluation criteria developed by KOSHA. Basic characteristics, evaluated scores, and sales performance were gathered and statistically analyzed. Results: The median and arithmetic mean of the total scores were 0.64 and 0.66. Evaluation fields that scored highly with the highest percentages were sales performance, installation and availability of equipment, compliance with the mandatory minimum number of airborne samples, laboratory independence, and results of proficiency analytical testing, in that order. Evaluation fields that received low marks with the highest percentages were the training of personnel, blank field samples, calibration of flow rates, preliminary check and visual inspection of the work area prior to the clearance test, and review and approval of final reports, in that order. Comparison of normalized scores between service providers registered for asbestos and other tasks and those designated for only asbestos showed significant differences in their evaluated scores. Sales performance did not show a positive correlation with evaluated scores. Conclusions: The quality management systems of domestic asbestos survey and monitoring service providers were poor. High scores were recorded mostly in evaluation fields related to regulatory requirements. Low scores were recorded mostly in evaluation fields related to documentation and recordkeeping. Considering the low influence of quality on sales performance, the government needs to evaluate the quality management of asbestos survey and monitoring service providers and provide the results to public in order to address their low levels of quality management.

• 보건의료산업학회지
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• 제9권3호
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• pp.43-55
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• 2015

Objectives : This study analyzed the managerial efficiency of hospitals and identified the productivity trends for three years. Methods : Data were collected from 44 tertiary hospitals and 32 university hospitals from 2009 to 2011. Efficiency scores and productivity trends were evaluated with the DEA (Data Envelopment Analysis) method. The input variables were the numbers of beds, doctors, nurses, and health personnel, and the medical costs. The output variables were the numbers of outpatients, and inpatients, and the medical revenues. Along with the traditional input-oriented DEA analysis, the Malmquist Productivity Index(MPI) was calculated. Results : First, the mean values of the study variables showed gradual increases in all the variables for all the study years. Second, technical efficiency scores varied depending on the study year. Third, MPI decreased from 2009 to 2010 (MPI=0.986), and then increased from 2010 to 2011(MPI=1.011). The contributions of the Efficiency Change Index and Technical Change Index on the MPI varied depending on the study year. Conclusions : This study provides information to hospital managers about changes in hospital performances. External environments had more influence on hospital performances, and hospital managers will need to manage these influences from factors surrounding the hospitals.

• 디지털융복합연구
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• 제12권5호
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• pp.171-180
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• 2014

본 연구는 정부의 R&D 지원사업에 참여하는 중소기업들의 참여요인이 기업의 R&D성과에 미치는 영향에 관한 것이다. 현재 정부의 R&D 지원사업은 여러 형태로 운영되고 있으며, 각 기업에 보조금이나 설비 및 장치, 인력, 교육 등의 지원이 이루어지고 있다. 각 기업들 또한 다양한 사업 참여요인을 가지고 지원 사업에 참여하게 된다. 따라서 본 연구는 이와 같은 정부 R&D 지원사업의 사업수행 종료 후, 기업의 다양한 참여요인이 관리적 성과에 해당하는 사업관리능력에 긍정적인 영향을 미치는지 대한 가설을 검증한다. 또한, 사업관리능력이 기술적 성과인 R&D 투자 강화와 기술역량 강화에 영향을 미치는지에 대한 가설을 검증한다. 이 분석결과를 통해 향후 정부지원사업에 참여하는 여러 기업들의 전략적 R&D성과 관리를 위한 방향설정에 도움이 될 것이다.

• 한국전자통신학회논문지
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• 제9권6호
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• pp.689-694
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• 2014

MANET에서 DDoS 공격은 네트워크 기능을 수행해야하는 노드를 무력화시켜 네트워크 전체를 마비시키거나 노드의 위치에 따라 네트워크를 분리시키는 치명적인 결과를 초래할 수 있다. 짧은 길이의 데이터를 일정길이의 데이터로 모아서 전송하는 패킷취합전송은 MANET 환경에서 전송성능이 개선되는 효과를 보이고 있다. 본 논문에서는 이러한 MANET 환경에서 DDoS 공격이 패킷취합전송의 전송성능에 미치는 영향을 종단간 관점에서 측정하고 분석한다. 종단간 성능측정에는 NS-2를 기반으로 구축한 MANET 시뮬레이터를 이용하였으며, MOS, 연결율, 지연 및 패킷손실율을 측정 대상 성능 파라미터로 사용하였다. 음성서비스인 VoIP 트래픽을 측정대상 트래픽으로 사용했다. 본 논문의 결과로서 DDoS 공격이 있는 MANET에서 패킷취합수가 4이상일 때 전송품질 유지에 유리함을 확인하였다.

• 한국정보시스템학회지:정보시스템연구
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• 제24권2호
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• pp.163-188
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• 2015

Purpose The healthcare services have drawn so much public attention, and many organizations such as schools and companies require the individuals to undergo the periodic health examination. In general, however, the mass health examination services are not managed in systematic way, and both examinees and medical staffs often experience much inconvenience while preparing, undergoing and managing the services. To address such problems, this paper aims to design the Health Examination Management System (HEMS), an integrated management system for mass health examination operations management, and implement its prototype. Design/methodology/approach First of all, HEMS enables the medical staffs to efficiently collect and manage the examination result data by supporting examination service management. Second, the users can efficiently analyze the cause-and-effect relationships among the examination items by using the visualization tool of HEMS based on the cluster heat map. Finally, the HEMS provides the operational supports for evaluating and managing the service performances. Findings The HEMS indicates that the conventional operations management approaches can be incorporated into the mass health examination services, and it is expected that the proposed system enables the examinees and the medical staffs to participate in such services in more efficient way.

• Agribusiness and Information Management
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• 제9권2호
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• pp.22-26
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• 2017

This study aims to understand why public information systems in agricultural fields have shown lower performances than other industrialized fields and industries and how these problems would be fixed and overcame. To accomplish this research purpose, this study would overview the previous studies on developing agricultural information systems in public sectors and would find out meaningful and considerable factors. This study would accept the methodologies of literature review and systems thinking approaches to understand the relationships among the found factors and to suggest the conceptual research model. Agricultural information system should take care to reduce implement and maintenance costs to reduce the negative relationships between costs and expected service value and between expected service value to perceived service value. Also, it should be understood that impersonal response would reduce the eager to use the services, so the government sectors should consider positively to adopt the concept of CRM even though the government sectors traditionally have ignored its necessity. The failure of public information systems/services may be caused not only by lack of the contents but also by the failure of the persistent post management.

• 한국경영과학회지
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• 제41권4호
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• pp.95-112
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• 2016

The purpose of this study is to develop a quantitative model to evaluate the performance of the servitized business model. We aim to quantitatively analyze the decisions of participants in the servitized supply chains, and provide methods to maximize the performance. We consider servitized supply chains consisting of a manufacturer and a service provider, that can be integrated, separated or coordinated based on the relationship between the manufacturer and the service provider. The decision models in each case are developed, and performance and profitability are analyzed. Utilizing the decision models in different cases, we compare the performances of different business models of the servitization. Since our models can be applied to analyze a wide range of the servitization business models, we expect this study can contribute to promote servitization in manufacturing companies by providing methods to evaluate the profitability of the servitization business model.