• The Transactions of the Korea Information Processing Society
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• v.6 no.1
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• pp.193-202
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• 1999

A promising telecommunication system so called IMT-2000 is forecasted to cover almost 50 percent of telecommunication services, which will be provided in the beginning of the year 2000. The system offers high quality service such as data, image, and video as well as voice. UPT, which offers the personal mobility, is recognized as an important service because we can bind a variety of wire or wireless networks as single number. This paper discusses the design of IMT-2000 MSC based on AIN and UPT service in the MSC. First, we propose the system structure of the IMP-2000 MSC, as a platform of UPT service implementation. Based on this, we define main functions and its blocks of the IMP-2000 MSC. Third, we present the structure of SSF and Its operational mechanism to support the IN services such as UPT. Finally, we present the detail UPT service implementation for the IMP-2000 MSC through the design of UPT call flows between software blocks, which are the minimum units, within the IMPt-2000 MSC.

• 한국정보통신설비학회:학술대회논문집
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• 2003.08a
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• pp.373-375
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• 2003

통신사업자들은 다양한 정보서비스를 제공하기 위한 노력과 통신품질 향상을 위한 시도를 다양하게 진행하고 있으며, 우수한 품질의 서비스를 저렴하게 공급하기 위한 노력도 시도하고 있다. 본 고에서는 KT가 경영 합리화와 내부 원가절감을 위한 여러 가지 노력 중에서 투자시설 공사와 관련하여 공사원가 계산방법의 개선을 위해 새로 도입한 다양한 방법들을 살펴본다. 특히 교환시설분야에서 적용 중인 실적공사비에 의한 예정가격 산정방법을 중심으로 개념과 적용사례 분석을 하기로 한다.

• 전기의세계
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• v.58 no.8
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• pp.51-60
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• 2009

지능형 전력망은 통신 기술을 통해 에너지 사용을 최적화 하고 안정성을 높이는 차세대 전력망으로서 그 내부에는 다양한 통신 환경과 특성이 존재한다. 지능형 전력망에서는 일반 수용가의 부하특성이나 전기 사용량 등 비실시간 정보뿐만 아니라 전력망의 안정적이고 지능적인 운영을 위한 다양한 감시제어 데이터와 같은 실시간 정보가 함께 전달된다. 이러한 정보들은 전달 과정에서 누출, 번조가 되지 않고 원하는 사용자에게 원히는 시간과 장소에 정상적으로 전달될 수 있도록 높은 수준의 정보 보안이 뒷받침 되어야 한다. 그러나 최근, 감시제어 정보 전달은 보통 인터넷과 같은 일반적인 통신보다 고품질을 요구하기 때문에, 통신 품질을 저하시킬 수 있는 보안 서비스를 지능형 전력망에 적용하기에는 제약이 따른다. 본 논문은 지능형 전력망의 주요 통신 환경별 요구사항을 살펴보고, 이러한 요구사항을 만족시키면서 높은 수준의 정보 보안을 제공하기 위해 어떠한 보안서비스가 제공되어야 하는지 알아본다.

• Journal of KIISE:Software and Applications
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• v.37 no.11
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• pp.812-825
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• 2010

Service-Oriented Computing (SOC) is a reuse paradigm for developing business processes by dynamic service composition. Service consumers subscribe services deployed by service providers only through service interfaces. Therefore, services on server-side are perceived as black box to service consumers. Due to this nature of services, service consumers have limited knowledge on the quality of services. This limits utilizing of services in critical domains hard. Therefore, there is an increasing demand for effective methods for monitoring services. Current monitoring techniques generally depend on specific vendor's middleware without direct access to services due to the technical hardship of monitoring. However, these approaches have limitations including low data comprehensibility and data accuracy. And, this results in a demand for effective service monitoring framework. In this paper, we propose a framework for efficiently monitoring services. We first define requirements for designing monitoring framework. Based on the requirements, we propose architecture for monitoring framework and define generic patterns for efficiently acquiring monitored data from services. We present the detailed design of monitoring framework and its implementation. We finally implement a prototype of the monitor, and present the functionality of the framework as well as the results of experiments to verify efficiency of patterns for transmitting monitoring data.

• Journal of the Korean Society of Food Science and Nutrition
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• v.40 no.8
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• pp.1164-1171
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• 2011

The purpose of this study was to compare service quality between local and global coffee brand shops and to investigate improvement. Of 350 questionnaires distributed to customers of six brand coffee shops (three local brands, three global brands) located in Daejeon, 330 complete questionnaires (94.3%) were analyzed. The questionnaire included a seven-point multiple-item scale for measuring service quality. The 21 items measuring service quality were grouped into four factors, and the mean scores for the levels of "representativeness", "coffee sensory and beverage features", "employee attitude" and "physical environment" were 5.42, 4.77, 4.74, and 4.13, respectively. The levels of "coffee sensory and beverage features" and "employee attitude" of the high income customers were significantly lower than those of the low income customers. The results showed that the levels of "employee attitude" of local coffee brand shops was significantly higher (p=0.050) than that of global coffee brand shops. Whereas, the levels of "representativeness" of global coffee brand shops was significantly higher (p=0.003) than that of local coffee brand shops. Based on the results, the global coffee brand shops should pay attention to internal marketing and the local coffee brand shops must strive to improve service quality through strategies such as improving brand awareness and developing representative beverages and foods.

• 한국항공운항학회:학술대회논문집
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• 2016.05a
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• pp.281-286
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• 2016

국 내외 기업들이 새로운 경영기법으로 도입하고 있는 아웃소싱은 비용절감, 핵심 업무에 대한 집중, 생산성 제고 등의 장점으로 빠르게 확산되고 있다. 인천국제공항 역시 공기업 경영혁신과 내부요인 등으로 인해에 개항과 함께 아웃소싱을 도입하였으며, 2014년 3월 현재에는 43개 분야에 아웃소싱을 도입하여 운영하고 있다. 이처럼 아웃소싱 도입이 확산 되면서 성공적인 아웃소싱 관리에 대해 모색하게 되었고, 인천국제공항 역시 효율적인 관리를 위해 주로 IT 분야에서 적용하고 있는 서비스수준협약(Sercive Level Agreement, SLA)을 전 분야에 걸쳐 도입하게 된다. 인천국제공항은 서비스수준협약을 통해 서비스 수준에 영향을 미치는 복합적인 요인을 효율적으로 관리하고 지속적인 서비스 품질수준을 유지하고자 도입한 것이다. 그러나 대부분의 서비스수준협약이 IT 분야에만 집중되어 있어 아직까지는 비(非) IT 분야의 서비스수준협약 시행은 초기 단계이며 서비스수준협약 측정지표 선정에 관한 연구는 매우 부족한 상태이다. 본 연구에서는 현재 인천공항에서 운영 중인 서비스수준협약을 유사용역 그룹별로 구분하여 구성요소와 역할에 대해 파악하고자 하였으며 서비스수준협약 측정지표가 공항운영 효율성에 어떠한 영향을 미치는지 확인하고자 하였다. 연구결과 서비스수준협약 측정지표의 명확성, 적정성, 업무 통제 가능성은 과업운영의 효율성에 유의미한 것으로 나타났으며, 현재 인천공항에서 운영 중인 서비스수준협약 평가 결과에 대한 인식이 과업 운영의 효율성에도 유의미한 것으로 나타났다. 또한 현행 서비스수준협약 평가 결과에 따라 과업의 문제점이 반영되는지 여부와 과업운영의 효율성 간의 상관관계 분석결과 통계적으로 유의한 것으로 분석되고 있다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.6B
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• pp.533-543
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• 2003

Recently, according to the rapid increase of Web users, various kinds of Web applications have been being developed. Hence, Web QoS(Quality of Service) becomes a critical issue in the Web services, such as e-commerce, Web hosting, etc. Nevertheless, most Web servers currently process various requests from Web users on a FIFO basis, which can not provide differentiated QoS. This paper presents two approaches to provide differentiated Web QoS. The first is the kernel-level approach, which is adding a real-time scheduling processor to the operating system kernel to maintain the priority of user requests determined by the scheduling processor of Web server. The second is the load-balancing approach, which uses If-level masquerading and tunneling technology to improve reliability and response speed upon user requests.

• Journal of KIISE
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• v.42 no.12
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• pp.1480-1485
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• 2015

As SSDs are increasingly being used as high-performance storage or caches, attention is increasingly paid to the provision of SSDs with Quality-of-Service for I/O request streams of various applications in server systems. Since most SSDs are using the AHCI controller interface on a SATA bus, it is not possible to provide a differentiated service by distinguishing each I/O stream from others within the SSD. However, since a new SSD interface, the NVME controller interface on a PCI Express bus, has been proposed, it is now possible to recognize each I/O stream and schedule I/O requests within the SSD for differentiated services. This paper proposes Flash Operation Group Scheduling within NVME-based flash storage devices, and demonstrates through QEMU-based simulation that we can achieve a proportional bandwidth share for each I/O stream.

• Journal of Korean Library and Information Science Society
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• v.44 no.1
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• pp.279-303
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• 2013

The purpose of this study is to suggest public library service positioning strategies for the segmented markets according to public library service users' loyalty. To achieve the study purpose, this study conducted interview with public library users. Qualitative method was utilized to analyze the data. The following public library service positioning strategies for the both segmented groups were suggested: 1) expanding of bookmobile service and utilization of shuttle bus, 2) regular and systematic user study, 3) diversification of public library service promotion methods, 4) user survey, 5) internal marketing, 6) increasing environmental quality of public library services, and 7) provision of reading programs for preschoolers, students, and their parents.

• Journal of Korean Society for Quality Management
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• v.35 no.4
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• pp.78-88
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• 2007

This paper is to investigate the relationship between international marketing and service quality, and the moderating effect of gender in that relationship. The data to make an empirical analysis were gathered from 269 workers in telecommunication sector. Multiple regression analysis revealed that (1) education was positively related with tangibility, reliability, responsiveness, empathy, assurance, and (2) internal communication was positively related with tangibility, reliability, responsiveness, assurance, and (3) delegation of authority was positively related with assurance. Hierarchical multiple regression analysis revealed that (4) compensation was more positively related with reliability in woman, and (5) employment security was more positively related with assurance in man.