• Proceedings of the Korean Operations and Management Science Society Conference
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• 1998.10a
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• pp.361-364
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• 1998

정보기술의 발달과 경영패러다임의 변화로 데이터웨어하우스가 등장했다. 기존의 관계형 데이터베이스를 기반으로 하는 데이터웨어하우스에서는 사용자가 다양하고 복잡한 분석을 효율적으로 수행하기가 매우 어렵다. 따라서 새로운 데이터모델 즉 다차원 모델이 필요하게 되었다. OLAP(Online Analytical Processing)은 이런 다차원적인 기업 데이터를 사용자가 분석하고 Report 할 수 있게 만들고 관리하는 역할을 한다. 이러한 OLAP은 클라이언트/서버 구조를 가지는데 OLAP 제품별로 질의방법이나 보고방식들이 다르다. 따라서 최종 사용자는 다른 Client 툴을 사용할 경우 새로운 질의 방법과 보고방식을 익혀야한다. 그리고 커스텀화된 OLAP Client툴을 사용할 경우 Server가 바뀌면 사용할 수 없게 되는 단점이 있다. 이런 문제의 원인은 OLAP Client가 Server에 의존적이기 때문이다. 본 논문에서는 이러한 문제점을 해결하기 위해서 OLAP의 특성과 OLAP Client가 지녀야 하는 특성을 알아보고 이러한 요구사항에 맞는 OLAP Server에 의존적이지 않은 통합된 OLAP Client를 제시하고 실제 구현하였다.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.353-354
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• 2008

Security weakness in PLC network can be made up for by authentication and management scheme of PLC modules introduced in this paper. Each PLC module must pass the authentication procedure to work normally in PLC network as soon as being installed in the spot. Based on this scheme, all PLC devices are registered, certified, and managed automatically in central control center - AMR server, authentication server, NMS server, and DB server.

• Proceedings of the Korean Society for Quality Management Conference
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• 2004.04a
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• pp.499-502
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• 2004

Multi-server Markovian retrial model with heterogeneous servers is analyzed. Arriving customers constitute the MMAP(Marked Markovian Arrival Process). Distribution of the primary customers among the servers is performed randomly depending on the type of a customer and the number of the server. Customers from the orbit have the exponential service time distribution with a parameter depending on the server only. The choice of the server for a retrial is made randomly as well. Multidimensional continuous time Markov chain describing operation of the model is investigated by means of reducing to asymptotically quasi-toeplitz Markov chaius.

• Journal of the Korea Society of Computer and Information
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• v.5 no.4
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• pp.218-226
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• 2000

The Purposes of this study are twofold. Firstly, the study investigated the spec of the server environment for managing the academic affairs, and overviewed the theoretical background in connection with the clients and the server as a way of implementing a comprehensive management system for school information which can be effectively utilized for cyber education, multimedia education, joint ownership of learning materials, and educational activities as well as management of the academic affairs using the UNIX-based server, which has lately installed on school thanks to the speedy development of the Internet, Secondly, this study, placing emphasis on practical aspects, attempted to find a method of implementing the web server for constructing a school website in order to provide educational information.

• Journal of Korea Society of Digital Industry and Information Management
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• v.7 no.4
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• pp.23-30
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• 2011

Recently, Tsai proposed a remote user authentication scheme suited for multi-server environments, in which users can be authenticated using a single password shared with the registration center. Our analysis shows that Tsai et al's scheme does not achieve its fundamental goal of password security. We demonstrate this by mounting an undetectable on-line password guessing attack on Tsai et al.'s scheme.

• Journal of Information Technology Services
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• v.9 no.4
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• pp.207-217
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• 2010

This paper is concerned with a protection system for the mentally handicapped, which is utilizing a GPS receiver and mobile communications. The protection system consists of a location notification equipment, a location identification and management server, and a cell phone of guardian. The location notification equipment is made up of a GPS receiver, a CDMA communication module and a microprocessor. The equipment transfers the location of the mentally impaired to the location identification and management server when the handicapped gets out of a certain bound of the designated facility. The server marks the handicapped's location on the map in the server and also notifies the guardian's cell phone of the locations. With applying the proposed protection system to social welfare organizations related to the mentally handicapped, it is expected to efficiently contribute to the promotion of the handicapped's welfare.

• Journal of Multimedia Information System
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• v.6 no.1
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• pp.43-48
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• 2019

An IoT-based server system for store management was developed in this study. Its client-server structure having a product categorization function allows the system to read the NFC tags attached to individual products and provides information about them to customers automatically. The system also provides an effective promotional effect as it not only offers necessary information about the items the customers are seeking but also displays the advertisements related to them. This server system was designed specifically designed for the use in a smart shopping Mall or a department store so that the store owners can manage their sales operation more effectively while their customers enjoy shopping more conveniently. It is expected that the technology used for this IoT-utilized server system can be one of the efficient and effective platform technologies in the current and future store management systems.

• Journal of the Korean Society of Systems Engineering
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• v.6 no.1
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• pp.61-68
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• 2010

Generally EPC management system was simply management concept through the normal S/W. Our LNG Plant R&D Center wanted to the excellent management system from the S/W. So We developed the R&D management S/W and EPC management S/W Built in the Microsoft Project Server. Our system made to the customer Requirements. It was just User Interface protocol. But User Interface has more Weak position, because it makes from the MS Project Servers. Ms Projector server make easy to treat the project on the WBS. EPC parts mixed WBS and normally Ms SQL Database. It has very complicated Structures. Now We planed to make the general Database and Ms Project Server, It' means to the S/W Developer and Schedule Manager ability. We will successfully integrate R&D management system and EPC system and other softwares.

• Journal of the Korea Society of Computer and Information
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• v.24 no.2
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• pp.95-101
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• 2019

Sensor application systems for remote monitoring and control are required, such as the establishment of databases and IoT service servers, to process data being transmitted and received through radio communication modules, controllers and gateways. This paper designs and implements database server, IoT service server, data processing middleware and IoT management system for IoT based services based on the controllers, communication modules and gateway middleware platform developed. For this, we firstly define the specification of the data packet and control code for the information classification of the sensor application system, and also design and implement the database as a separate server for data protection and efficient management. In addition, we design and implement the IoT management system so that functions such as status information verification, control and modification of operating environment information of remote sensor application systems are carried out. The implemented system can lead to efficient operation and reduced management costs of sensor application systems through site status analysis, setting operational information, and remote control and management.

• Annual Conference of KIPS
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• 2001.04a
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• pp.507-510
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• 2001

HTTP/1.1 standard reduces latencies and overhead from closing and re-establishing connections by supporting persistent connections as a default, which encourage multiple transfers of objects over one connection. HTTP/1.1, however, does not define explicitly connection-closing time but specifies a certain fixed holding time model. This model may induce wasting server's resource when server maintains conn ection with the idle-state client that requests no data for a certain time. This paper proposes the mechanism of a heuristic connection management supported by the client-side under persistent HTTP, in addition to HTTP/1.1's fixed holding time model on server-side. The client exploits the tag information within transferred HTML page so that decides connection-closing time. As a result, the mechanism allows server to use server's resource more efficiently without server's efforts.