• Journal of the Korea Computer Industry Society
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• v.3 no.5
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• pp.641-652
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• 2002

In this paper, proposes Kerberos certification mechanism that improve certification service of PKINIT base that announce in IETF CAT Working Group. Bid to certificate other realm because search position of outside realm through DNS and apply X.509 directory certification system, acquire public key from DNS server by chain (CertPath) between realms by certification and Key exchange way that provide service between realms applying X.509, DS/DNS of PKINIT base. In order to provide regional services, Certification and key exchange between realms use Kerberos symmetric method and Session connection used Directory service to connection X.509 is designed using an asymmetric method. By efficient TGT (Ticket Granting Ticket) exchange and reusability of ticket, A Design of Kerberos system that have effect and simplification of certification formality that reduce overload on communication.

• The KIPS Transactions:PartA
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• v.13A no.2 s.99
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• pp.111-122
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• 2006

As VOD service over the Internet becomes popular, a large sealable VOD system in P2P streaming environment has become increasing important. In this paper, we propose a new proxy caching scheme, called P2Proxy, to replace the traditional proxy with a sealable P2P proxy in P2P streaming environment. In the proposed scheme, each client in a group stores a different part of the stream from a server into its local buffer and then uses a group of clients as a proxy. Each client receives the request stream from other clients as long as the parts of the stream are available in the client group. The only missing parts of the stream which are not in the client group are directly received from the server. We represent the caching process between clients in a group and a server and then describe a group creation process. This paper proposes the directory structure to share the caching information among clients. By using the directory information, we minimize message exchange overload for a stream caching and playing. We also propose a recovery method for failures about the irregular behavior of P2P clients. In this paper, we evaluate the performance of our proposed scheme and compare the performance with the existing P2P streaming systems.

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.497-501
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• 2009

The object information service of mobile RFID base leads integrated management of object information and the search of information and management service is provided. Respects an object information service and to make an object information server and an object directory server compose becomes. And to object information server constructs the DB server which will store information and DB leads and object information manages. Like this object information service is applied in the field which RFID bases is various and becomes. Therefore the administration tool for the object information service will be able to apply easily in the field which is various is necessary. So this paper e in object information management which the components out the functions which are necessary to the respectively field of RFID environments to do from the research which sees and apply. That according to the research result which see the object information service see is a possibility of becoming accomplished easily efficiently from RFID environments which are various comes to seem.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.2
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• pp.231-239
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• 2002

This paper gives a comprehensive overview of the SSO solution design on the intranet. SSO described in this paper is based on LDAP, PKI and CA. We designed the data structure to hold many various application services by changing the attribute and DN of LDAP DB. We built LDAP DB using the employee records stored in our organization database. LDAP DB is routinely updated from the database. CA Server that depends on PKI is used to issue the certificates. SHTTP based on SSL is used to protect the data between certificate server and the intranet users.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10b
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• pp.301-303
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• 1999

기존의 웹서버에는 디렉토리 관리를 위한 기능이 없다. 즉 서버의 파일 시스템에 디렉토리를 만들고, 지우고 다른 곳으로 옮기는 등의 기능을 웹 서버만으로는 수행할 수 없다. 이러한 기능을 수행하기 위해서는 ftp 서버와 같은 프로그램을 서버 시스템에 설치하여 ftp 클라이언트 프로그램에 의해 이 일을 수행할 수 있는데 이는 서버 시스템의 부하를 증대시키는 요인일 될 수 있다. 그러므로 웹 서버에 디렉토리 관리에 대한 기능을 추가하여 추가적인 프로그램 없이 간단하게 디렉토리 관리를 할 수 있도록 하여 유용성을 확장할 수 있다. 이러한 기능은 강의 및 숙제제출을 위해 파일 업로드 및 다운로드가 빈번하게 일어나는 특징이 있는 특징이 있는 인터넷 강의 시스템에 적합하다. 또한 동시에 많은 사용자들일 접속할 수 있어야 하는 인터넷 강의를 위해 서버의 부담이 크지 않은 웹서버가 필요하다. 본 논문에서는 이러한 요구를 반영해서 디렉토리 관리 기능을 추가한 웹서버를 제시하였다. 웹서버에 파일처리를 위한 디렉토리서버를 추가하여 보다 빠르게 파일처리를 할 수 있도록 하고 아파치 같은 기존의 웹서버 보다 시스템 부하를 줄여 동시에 많은 사용자들의 요청을 받아들일 수 있도록 하는 서버를 구축하였다.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.04a
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• pp.76-81
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• 2000

앞으로 전자상거래는 미국 , 일본등 경제선진국을 중심으로 확대, 발전해 나갈것이고 이에 따라 이를 시스템적으로 지원할 수 있는 지불시스템의 필요성은 더욱 부각될 것이다. 이 지불 시스템에서 핵심적인 기능은 인증기능이 될 것이고 인증에 대한 데이터를 관리하는 디렉토리 서버의 기능과 성능향상은 전제 지불시스템 더 나아가 전자상거래를 활성화 시키는데 절대적인 역할을 할 것이다. 이러한 현시점에서 세계 각국의 대응에 관심을 가지고 국내에서도 독자적인 기술로 국내 환경에 맞는 인증시스템의 개발이 절실하게 필요한 때이다. 본고에서는 X500시리즈와 MIT의 Kerberos Authentication System을 접목시켜 운용 가능한 전자상거래모델을 제시하고 이를 구현시 고려해야할 사항들을 제시함으로 해서 향후 보안 및 전자상거래 관련 분야에서 급속한 수요 증가가 예상되는 디렉토리 서버구현을 위한 모델을 제시하고자한다.

• Journal of the military operations research society of Korea
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• v.29 no.1
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• pp.57-75
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• 2003

Policy-based networking offers a network manager the ability to manage the network in a holistic and dynamic fashion rather than force a network manager to manage the network by dealing with each device individually. Policy-based networking is focusing on users and applications instead of emphasizing devices and interfaces. An important part of the policy-based networking is to simplify the task of administration and management for different disciplines. The Defense Information System(DIS) of today are complex and heterogeneous systems. Operational needs are not a trivial task and Quality of Service(QoS) is not generally guaranteed. So, important data may be missed or congested by trivial data. Policy-based networking provide a way to support QoS and simplify the management of multiple devices deploying complex technologies. This paper suggest implementation of policy-based networking in DIS to improvement of performance, and implementation is progressed step by step. Especially this paper is focusing on the providing QoS with policy-based networking using Lightweight Directory Access Protocol(LDAP) Server.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.183-186
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• 2004

UPnP 미디어 서버는 UPnP AV 아키텍처에서 컨트롤 포인터에게 서버와 서버에 저장되어 있는 컨텐츠에 대한 정보를 제공하기 위해서 구현되는 미들웨어이다. 보아 서버와 MPlayer로 구현되는 스트리밍 환경에서 UPnP AV 아키텍처는 각 디바이스를 발견하고 정보와 서비스를 질의하며 스트리밍 서비스를 설정하고 제어할 수 있는 기능을 제공한다. 본 논문에서의 UPnP 미디어 서버는 리눅스 셋탑 환경에서 동작하며, 서비스를 제공하는 AV 컨텐츠에 대한 정보를 제공하고 질의를 처리하기 위한 컨텐츠 디렉토리(Content Directory) 서비스와 미디어 서버, 타겟 디바이스 사이에서 전송 프로토콜과 데이터 포맷을 조율하기 위한 커넥션 메니저 (Connection Manager) 서비스를 구현하였다. 미디어 서버는 XML 기반의 DIDL로 기술된 메타 데이터를 이용하여 서버의 컨텐츠 정보를 관리하며, 컨트롤 포인터의 요청을 맞게 정보를 재구성하여 전달한다.

• Proceedings of the KSRS Conference
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• 2002.10a
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• pp.838-843
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• 2002

Recently, PDA and cellular phone with color LCD have been widely used in various fields by high efficiency and micro miniaturization technology. According to maturity of these mobile environments, user request about mobile application field is increased. Mobile applications provide various information which is concerned with user's position through cable and wireless transmission. This paper discusses the issues related to the mobile framework for integrated 4S data. The integrated 4S data mean spatial data fusion on GIS, SIIS, ITS, and GNSS. The mobile framework provides not only spatial data but also location services such as reverse geocoding, directory service, etc. It consists of client subsystem, service provider, and data provider.

• Radiation Oncology Journal
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• v.33 no.2
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• pp.142-148
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• 2015

Purpose: To develop new on-line statistical program for the Korean Society for Radiation Oncology (KOSRO) to collect and extract medical data in radiation oncology more efficiently. Materials and Methods: The statistical program is a web-based program. The directory was placed in a sub-folder of the homepage of KOSRO and its web address is http://www.kosro.or.kr/asda. The operating systems server is Linux and the webserver is the Apache HTTP server. For database (DB) server, MySQL is adopted and dedicated scripting language is the PHP. Each ID and password are controlled independently and all screen pages for data input or analysis are made to be friendly to users. Scroll-down menu is actively used for the convenience of user and the consistence of data analysis. Results: Year of data is one of top categories and main topics include human resource, equipment, clinical statistics, specialized treatment and research achievement. Each topic or category has several subcategorized topics. Real-time on-line report of analysis is produced immediately after entering each data and the administrator is able to monitor status of data input of each hospital. Backup of data as spread sheets can be accessed by the administrator and be used for academic works by any members of the KOSRO. Conclusion: The new on-line statistical program was developed to collect data from nationwide departments of radiation oncology. Intuitive screen and consistent input structure are expected to promote entering data of member hospitals and annual statistics should be a cornerstone of advance in radiation oncology.