• Journal of the Korea Society of Computer and Information
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• v.22 no.8
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• pp.73-83
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• 2017

In this paper, we discuss the differences between an ordinary B-tree and B-tree implemented by NTFS. There are lots of distinctions between the two B-tree, if not understand the distinctions fully, it is difficult to utilize and analyze artifacts of NTFS. Not much, actually, is known about the implementation of NTFS, especially B-tree index for directory management. Several items of B-tree features are performed that includes a node size, minimum number of children, root node without children, type of key, key sorting, type of pointer to child node, expansion and reduction of node, return of node. Furthermore, it is emphasized the fact that NTFS use B-tree structure not B+structure clearly.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.257-259
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• 2000

VOD나 영상회의 등과 같은 실시간 서비스를 이용하는 사용자가 급속도로 증가함에 따라 QoS 보장이라는 새로운 요구사항이 등장하였지만 현재 인터넷의 Best-effort 방법으로는 QoS 보장을 완전히 지원하지 않고 있다. 이를 해결하기 위한 방법에는 망 차원의 QoS 아키텍처 이외에도 사용자가 원하는 QoS 보장을 위한 애플리케이션 레벨 QoS 정의와 DiffServ와 같은 새로운 망에서의 QoS 지원을 위한 체계적 정보가 필요하며 이러한 정보를 저장하고 관리할 실시간 서비스에 맞는 정보 저장소가 요구되고 있다. 따라서 본 논문에서는 대표적인 실시간 서비스인 VOD 서비스의 QoS 보장을 위해 필요한 정보들을 추출하여 디렉토리 객체로 정의하고, 효율적인 탐색이 가능한 확장된 디렉토리 시스템을 설계한다. LEAP(Lightweight Directory Access Protocol)을 이용하여 정보를 액세스하는 디렉토리 시스템은 저장소의 물리적 위치에 대한 제약 없이 정보의 분산 및 접근을 용이하게 하며, 논리적인 트리 구조에 따르는 빠른 검색을 가능하게 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.11a
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• pp.406-410
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• 1999

This paper supposes the SNMP network management system based upon Mobile Agent using the Naming and Directory Service, which is JNDI(Java Naming Directory Interface) technology. The Mobile Agent network system is expected to provide a solution for the conventional centralized network system. So, We have designed and implemented the network management system based upon Mobile Agent using JNDI

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.328-330
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• 2001

클라이언트-서버환경에서 클라이언트가 다수의 서버에 분산되어 저장 관리되는 대용량의 공간데이터와 공간 뷰에 대해 효율적으로 접근을 하기 위해서는 서버는 분산 저장되어 있는 공간데이터간의 위치정보를 파악하고 있어야하며 서버는 이를 이용하여 클라이언트의 질의요청에 답해야 한다. 본 논문에서는 공간데이터베이스에 흩어져 있는 공간데이터와 공간 뷰에 대한 접근 방법으로 공간데이터베이스의 공간메타정보에 대한 디렉토리서비스를 제안하며, 이러한 디렉토리서비스를 이용하여 분산된 공간데이터와 공간 뷰에 대한 접근을 할 수 있는 Multi-SDBMS 시스템에서의 디렉토리서비스 관리기의 실계 및 구현을 제안한다. 디렉토리서비스를 구현하기 위해서 LDAP(Lightweight Directory Access Protocol) 모델을 사용하며, LDAP의 스키마를 공간데이터와 공간 뷰에 대한 메타데이터를 지원하기 위해서 확장한다.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.555-557
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• 2003

Location-based services allow consumers to receive services based on their geographic location data. For example, businesses can provide information to find traffic facility, public restaurant, a hospital, and a station based on the consumer’s location at a particular moment. Also, they wish to grasp a accurate location based service in mobile device or PDA. So, this paper shows that presentation service offers a base-map to be overlaid OpenLS (Open Location Services)’s directory service, route determination service, geocode and reverse-geocode service. The presentation service is the portrayal of a map and portrayal of feature as map overlays.

• Proceedings of the IEEK Conference
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• 2003.11b
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• pp.179-182
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• 2003

In this paper, we developed those OpenLS(Open Location Service) Core Services based on the Web-Service, because Web-Service environments provide a suitable method to gather requested information in an appropriate way. The proposed architecture cooperate with OpenLS Core Services( Directory Service, Location Utility Service and Router Determination service) and is an interoperability one - it identifies those global elements of the global Web-Services network that are required in order to ensure interoperability between Web-services. In this paper, a new architecture of OpenLS Core Services is proposed and tested in OpenLS Core Services environments.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.849-851
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• 2003

A location-based service or LBS in a cellular telephone network is a service provided to the subscriber based on his current geographic location. This position can be known by user entry or a GPS receiver that he carries with him, but most often the term implies the use of a function built into the cell network that uses the known geographic coordinates of the base stations through which the communication takes place. One implication is that knowledge of the coordinates is owned and controlled by the network operator, and not by the end user. Location utility service provides two kinds of functions, geocoder and reverse geocoder. Geocoder converts an address into a coordinate and reverse geocoder changes a coordinate into an address. Because location utility service is the first step to progress LBS, various servises such as directory, routing, presentation, and etc require to access that. In this paper, we will describe the architecture of LBS platform and the concept and the role of location utility service.

• The KIPS Transactions:PartC
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• v.9C no.3
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• pp.313-322
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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 Ggroup. Did 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/BNS 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. Excluded random number ($K_{rand}$) generation and duplex encryption progress to confirm Client. 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.1 s.98
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• pp.27-34
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• 2006

Designers should know CAD tool/license information such as available number of licenses or tools, types, and configuration methods to use CAD tools properly in their group. Usually, this information is provided by managers who administrate CAD tool and license servers in the specific design group. In the previous CAD tool/licenses sharing methods, designers have to get CAD tool/license information manually and setup the environments with their own hands. n a new designer comes into the design working group, the designer wastes unnecessary design time, because of these processes. As a result, designer's poductivity and utilization of CAD tools will decrease Besides, managers also waste their time and effort, since they should provide CAD tool/license information manually to each designer. In this paper, we present an automated scheme to share CAD tool/license information based on directory service. The proposed methods automate the communication processes between managers and designers that minimze unnecessary time to share CAD information. In addition, as this system maintains the consistency of CAD information automatically that remove the repeated work of managers and designers, it improves the enciency of sharing. Besides, it automates the license configuration steps using prof(y Last, we offer Executable Proxy which is proper for thin CAD application. We believe this scheme will reduce designers and managers' time and effort as well as maximize the utilization of CAD tools.

• Journal of Korea Society of Industrial Information Systems
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• v.9 no.2
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• pp.44-50
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• 2004

Recently, as the number of entities participating in the Grid system increased, the response time of LDAP system became inadequate. Consequently, we have to design new LDAP that suitable for high performance Grid environments. For this, researches about analysis of performance LDAP system are needed firstly. However, because researches are focused mostly on read operation optimized environments, so these result of researches are not directly applied to high performance Grid environments that write operation occupies most. In this paper, we provide overall results of analysis of performance of distributed directory system. The analysis is based on an analytic performance model by applying the M/M/1 queuing model. Finally, based on the results, we suggest the direction for the design of high performance LDAP system and this research results can be applied as basic materials to design of GIS in high performance Grid environments as well as.