• Journal of KIISE:Information Networking
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• v.33 no.3
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• pp.277-287
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• 2006

Most of the existing broadband access networks based on DSL, cable modem, and Ethernet support the best-effort internet access service, and adopt the flat rate pricing mechanism. It is almost impossible to provide the differentiated communication services, in current broadband access networks, for the different users and/or the different application services. Currently, however, the advances in multimedia, communication, and security technologies push the interactive and/or streaming multimedia services and VPN services to be widely deployed over Internet, and they require more QoS-sensitive services than the best-effort service. Though various QoS technologies such as RSVP-based IntServ and DiffSern were already developed and under standardization in Internet world, it is impractical to replace the existing QoS-unaware access networks with the QoS-enabled ones at a time to deploy QoS-sensitive services. In this paper, after analyzing current broadband access network architectures and the status of QoS support, we propose a practical approach to support multimedia QoS in the broadband access networks. The approach will be based on the integration of the differentiated pricing and the DiffServ technology. And it will be a step-wise approach to support backward compatibility with the legacy broadband access networks as much as possible.

• Journal of KIISE:Software and Applications
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• v.36 no.3
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• pp.187-199
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• 2009

With the advent of Web 2.0, OpenAPIs are becoming an increasing trend to emphasize Web as platform recently. OpenAPIs are used to combine services and generate new services by mashup. However because the standard documents for OpenAPIs do not exist, it may restrict the use of OpenAPIs. Previous studies of OpenAPIs mashup have been limited to tool design or language definition for service combination rather than dynamic composition. On the other hand, Web services that are a software technology implementing SOA provide standard documents such as WSDL to explain each service, UDDI to register it, and SOAP to transfer messages. Thus Web applications can interpret and execute services by using these technologies. Recent works have also been performed to provide semantic features and dynamic composition for SOA. If a dynamic and systematic approach is provided to combine Web services and OpenAPIs, Web applications can provide users with diverse services. In this study, we present a SOA based framework for mashup of OpenAPIs and Web services. The framework supports dynamic composition of OpenAPIs and Web services, where the process of composite services is described in OWL-S. A prototype is provided to validate our framework. The framework is expected to add diversity to typical Web services.

• Journal of Information Management
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• v.43 no.2
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• pp.103-132
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• 2012

This study seeks to propose and develop library science courses required in the digital age by investigating overseas LIS courses and surveying field librarians. Such courses must help the future librarian develop familiarity and skill with emerging technologies. As a result, required courses in the digital era were found to be: 'Design and Management of Databases', 'Library Planning, Marketing, and Assessment', 'Understanding Information Technology for Managing Digital Collections', and 'Information and Communication in a Digital Age' in that order, and should therefore be offered as core courses. In addition, 'Service for Information Disadvantaged Users' and 'Organization and Utilization of Web resources' were derived. The study also recommends different required courses based on different librarian types and duties.

• Journal of Korean Library and Information Science Society
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• v.53 no.3
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• pp.137-168
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• 2022

The purpose of this study is to suggest a plan for establishing SR (systematic review, hereinafter called SR) support services in domestic university libraries through a case study of SR support services in overseas university libraries. For this purpose, a total of 119 overseas university libraries were divided into all fields (subjects and disciplines) and the medical field. And A total of 10 areas such as service fields, service subjects, public relations, librarian roles (counselors, collaborators), education, librarian introduction, team member, application form, SR theoretical content, and others were divided and investigated. As a result, the SR support service of the university libraries being investigated is expanding from the medical field to academic fields such as natural science, engineering, and social science. It was confirmed that there were differences in service support hours, services, and whether co-authors were recognized according to the role of the librarian. Educational services are provided to users for the SR support service with a focus on retrieval strategy and skills. In the promotion of the SR support service, the librarian must suggest that it should be included. The importance of SR support services for Korean university libraries should be emphasized through the analysis of SR support services for overseas university libraries, professional search education should be strengthened in the curriculum. Also Organizations related to university libraries such as KERIS have suggested that systematic SR education support is needed for librarians.

• Journal of KIISE:Computing Practices and Letters
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• v.13 no.5
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• pp.260-270
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• 2007

Owing to the improved wireless communication technologies, it is possible to provide streaming service of multimedia with PDAs and mobile phones in addition to desktop PCs. Since mobile client devices have low computing power and low network bandwidth due to wireless network, the transcoding technology to adapt media for mobile client devices considering their characteristics is necessary. However, since mobile clients use wireless network and the wireless network have less stable bandwidth according to distance from AP and environments, it is hard to support stable QoS to mobile clients. In this paper, we propose a dynamic bit rate control method for transcoding in order to supprot stable QoS of streaming media service to mobile clients via wireless network. The proposed method is shown to serve seamless streaming media service with adaptive bit rate control according to state of wireless network in real time and to reduce transmission failure from experiment.

• Journal of KIISE:Computing Practices and Letters
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• v.5 no.4
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• pp.489-497
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• 1999

국내의 ATM 기술은 대부분 교환기 시스템 개발에 집중되어 있었고 최근에는ATM 서비스 분야에 대한 개발 요구가 있다. 이러한 가운데 Internet 서비스는 데이타 망의 기본 서비스로 자리잡았으며, ATM망도 기본적으로 Internet 서비스를 지원하여야 한다. IETF의 IPOA (Classical IP and ARP over ATM)는 국내 망 여건 및 구현의 용이성으로 Internet 서비스를 위한 프로토콜중 가장 선호 대상이지만 RFC사양의 허술함, 구현자의 사양에 대한 이해 부족과 초기 외산 장비 제조 업체들의 자체 사양때문에 기존의 IPOA장비들과 상호 운용 시험에서 후발 IPOA 개발자는 시행착오를 겪어야만 한다. 본 논문에서는 기존 외산 IPOA 장비들과 자체 개발한 장비와 상호 운용 시험을 수행하면서 겪은 사례 연구를 정리하였고 이를 기초로 기존의 외산 IPOA와 상호 운용할 수 있는 최종 요구 사항을 제시하였다. 본 논문을 기초로 IPOA 장비를 개발한다면 국내 후발 ATM 장비 업체는 개발의 시간 및 노력을 줄일 수 있고 향후 IP/ATM 국내 기술력 향상에 도움이 될 것이다.Abstract While we have been focusing on development of ATM switching systems, recently the demand on service by use of ATM switching system is increasing rapidly. Among various ATM services, the Internet service should be provided in an ATM network since the Internet service has been the basic data service. Many domestic engineers consider the classical IP and ARP over ATM (IPOA) to be an appropriate method for interworking of IP and ATM because the IP is the network protocol used in most domestic data networks, and the IPOA is simpler and has less overhead than other approaches. However, it is not easy for a developer to implement the IPOA function module interoperable with other existing ones due to the incomplete description of IETF's RFC specifications, misunderstanding of designer and/or developer, and incompatible vendors' specifications. In this paper, we show several case studies undertaken for interoperability tests of IPOA products between our product and other vendor's products, and discuss the implementation requirement of the IPOA software to be interoperable with the existing IPOA equipment.The design and implementation requirements presented in this paper will reduce the effort of IPOA-developing engineers and time required for interoperability test. Also, this contribution will be helpful in IP/ATM interworking areas.

• Journal of KIISE:Databases
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• v.33 no.3
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• pp.299-309
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• 2006

Due to the rapid development in mobile communication technologies, the usage of mobile devices such as cell phone or PDA becomes increasingly popular. As different devices require different applications, various new services are being developed to satisfy the needs. One of the popular services under heavy demand is the Location-based Service (LBS) that exploits the spatial information of moving objects per temporal changes. In order to support LBS efficiently, it is necessary to be able to index and query well a large amount of spatio-temporal information of moving objects. Therefore, in this paper, we investigate how such location information of moving objects can be efficiently stored and indexed. In particular, we propose a novel location encoding method based on hierarchical administrative district information. Our proposal is different from conventional approaches where moving objects are often expressed as geometric points in two dimensional space, (x,y). Instead, in ours, moving objects are encoded as one dimensional points by both administrative district as well as road information. Our method is especially useful for monitoring traffic situation or tracing location of moving objects through approximate spatial queries.

• Electronics and Telecommunications Trends
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• v.21 no.2 s.98
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• pp.15-25
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• 2006

최근 IT, BT, NT 기술간 융합이 가속화되면서 새로운 형태의 기술과 서비스가 등장하고 있다. 미국, 일본, 유럽 등 선진국은 정부와 기업이 연대하여 기술간 융합을 고부가가치 창출에 필요한 첨단기술로 인식하고 융합기술 개발을 적극적으로 추진하고 있고, 우리 정부도 과학기술부, 산업자원부, 정보통신부를 중심으로 융합기술 발전계획을 수립하고 있다. 융합기술 개발을 통해 미래의 핵심기술을 확보하고, 컨버전스 시대의 조류에 대응하며, 새로운 성장동력을 창출하고, 건강하고 안전한 삶을 실현할 수 있다. 본고에서는 먼저 IT-BT-NT 융합기술의 분류, 특징 및 기대효과를 살펴보고, 산업육성전략 방안을 제시하고자 한다.

• Journal of Korea Technology Innovation Society
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• v.14 no.2
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• pp.223-245
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• 2011

We have analysed the impact of innovation on the employment in the Korean Service sector using KIS 2006 data. Our study is based on Bogliacino and Pianta (2010)'s model, which involves two main innovation strategies, technological competitiveness and cost competitiveness, as the main explanatory innovation variables for the employment dynamics. Empirical results show that an increase in demand was the strongest driver for an increase in employment in all four service sectors, including Science-based, specialized supplier, size and information intensive, and supplier dominated. Innovation strategy appeared to have a significant effect on employment at the firm level; Technological competitiveness showed a positive effect on employment in science based sector while cost competitiveness appeared to give a negative effect in specialized supplier sector. The firms in size and information intensive sector showed that increase in wages gives negative impact on their employment. However, cost competitiveness did not give any significant effect on employment dynamics of firms in size and information intensive sector and supplier dominated sector. This finding is different from the research of Bogliacino and Pianta (2010) on the European countries. One possible explanation would be that innovation strategy does not affect employment of firms in size and information intensive sector and supplier dominated sector since the level of innovativeness of these sectors in Korea fall behind that of European countries.

• Journal of KIISE:Computing Practices and Letters
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• v.10 no.4
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• pp.328-336
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• 2004

Recently a mobile service is changing into a system environment that offers the customer various contents service. Representative example of service is a Calling Identity Del ivory Service(CID). Such service has the problem in the case which the receiver cannot remember the phone number of the sender; it has a difficult problem that cannot easily confirm whose the phone number it is. Therefore, it is desirable to design and implement visual services that can enhance the recognition of users. In this paper, we propose the architecture that is similar to a Calling Identity Delivery Service. We propose the architecture for communication service and system that is able to visually display the information of the sender using 2D image data in mobile environment. After that we set the image information to represent the user and this method is able to visually display the information of the sender by transmitting an image data through channels from switch station or base station using the server. When the receiver receives a phone call from the sender, this method provides an efficient service by transmitting visual data with bell sound. That is, the image information of sender is appeared on liquid crystal display(LCD) of the receiver at the same time. We investigate the concepts for processing real-time transmission of image data and describe an example of the implementation result that is based on system. This technology has a potential influence on the marketing and presents an efficiency of this method.