• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.05a
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• pp.567-570
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• 2014

The basic of a reliable service using a system and network is duplex configuration. There are a various duplex configuration for a system and network and we must have a performance indicator about how to use some redundancy. Then, we need analysis tool and method which analyze efficiently the performance about various duplex models. The tool that analyzing the performance and stability of the system and the network are a mathematical analysis method and simulation method. The mathematical analysis is a commonly used method, but high complexity system is not suitable for analysis methods and the simulation method has the problems which take a long time to understand in itself. Then, to overcome this problems, we propose the more simple method than used method for network analysis and we prove the efficiency by using the simple redundancy models.

• Proceedings of the KIEE Conference
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• 2006.10c
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• pp.354-356
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• 2006

In this paper, the position control performance of networked control systems is analyzed when time delay through the network is considered. Integrating a control system into a network has great advantages over the traditional control system which uses point to point connection: it allows remarkable reduction in wiring, makes it easy to install and maintain the system, and improves compability. However, a networked control system has the critical defect that network uncertainties, such as time delay, can degrade the control system's performance. Therefore, the major concern of a networked control system is analyzing the effect of network uncertainties. This paper is concerned with PID controller performance for stability region, critical stability region and unstability region under the time delay in the Controller Area Network.

• Journal of Digital Contents Society
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• v.19 no.4
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• pp.801-808
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• 2018

The performance test methodology for switch, router or integrated networks that make up the wired network is not clearly defined. Due to smart phones and multimedia traffic, the speed of the network is rapidly increasing to 100Gbps. However, there is no formalized test method, and performance test related parts are still being tested based on old data. Telecommunication companies and companies are testing their requirements in their own BMT, and government or public institutions are requesting performance tests from external organizations. As the demand for the performance test of next generation network equipments and the integrated network increases, analysis of the performance test method should be done as soon as possible. Therefore, in this paper, we analyze the performance test method performed by the institute and propose guidelines that can be applied to all wired network equipment.

• Korean Management Science Review
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• v.11 no.1
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• pp.187-196
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• 1994

Time-Space-Time(T-S-T) switching network is modeled as a graceful degrading system. Call blocking probability is defined as a measure of performance. Several performance related measures are suggested under the presence of failure. An optimization model is proposed, which determines optimal values of system parameters of the switching network.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.1
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• pp.60-66
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• 2009

A service network in the future ubiquitous environment can consist of a variety of elements, which include different protocols of the network transport. Interwoking different transport protocols can alleviate such problems occurred in accessing network as poverty of facilities, faults, and contention in a path of particular protocol communication. This paper schemes to improve performance of the network constituted of different protocols for the network transport. Interposing an interwork element, like SDR (Software Defined Radio), in the network can raise availability of transport paths, and then improve transport performance of the overall network Simulation analysis justifies such a scheme and this paper presents simulation results.

• The Journal of the Korea Contents Association
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• v.2 no.3
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• pp.96-104
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• 2002

This paper has done a network performance test as well as result analysis of the test in a real campus gigabit network The inner network backbone consists of gigabit ethernet . The mean ratio of network use is below 1% age, and the maximum one comes to 10%. The floating capacity is still good enough to meet network flowing because the mean ratio of inner campus network as outer ones is 30.4% and the maximum one is merely 38.3%. But there appears a security problem. We must make a device blocking illegal approach to the client form outer network It is important that we can a away to manage the campus gigabit network efficiently on the basis of the given data from this performance test.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.334-337
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• 2005

This paper describes the implementation of DCS communication network that provides high bandwidth and reliability. The network for DCS in this paper adopts the Reflective Memory (RM) architecture and Fast Ethernet physical media that have 100Mbps bandwidth. Also, this network uses Ring Enhancement Device (RED) which was invented to reduce the time delay of each node. The DCS network that is introduced in this paper is named as ERCNet(Ethernet based Real-time Control Network). This paper describes the architecture and working algorithms of ERCNet and performs numerical analysis. In addition, the performance of ERCNet is evaluated by experiment using the developed ERCNet network.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.6
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• pp.1081-1090
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• 2015

This work proposes a theoretic framework for the performance assessment of an access point in the IP network that accommodates MD (Machine Data) and HD (Human Data). First, we investigate typical resource allocation methods in LTE for MD and HD. After that we carry out a Max-Min analysis about the surplus and deficiency of network resource seen from MD and HD. Finally, we evaluate the performance via numerical experiment.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.8B
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• pp.747-754
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• 2004

The Internet is in the phase of transition of IPv6 and the network equipments based on IPv6 are released. A lot of investments are done in development of network equipments but important thing is service technology. And a various experiments are performed for this service technology. However, the performance measurements of a router between IPv4 and nv6 networks are mainly focused. Therefore, the performance measurement of Internet application services need to be done. In this paper, we show the performance analysis results that the Internet application services are provided regardless of network infra and protocols. As a result, we know that the efficiency of dual networks is lower than the native network for the Internet application services.

• Journal of Information Technology Services
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• v.17 no.3
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• pp.171-189
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• 2018

To remove software defects and improve performance of software, many developers perform code inspections and use static analysis tools. A code inspection is an activity that is performed manually to detect software defects in the developed source. However, there is no clear criterion which source codes are inspected. A static analysis tool can automatically detect software defects by analyzing the source codes without running the source codes. However, it has disadvantage that analyzes only the codes in the functions without analyzing the relations among source functions. The functions in the source codes are interconnected and formed a social network. Functions that occupy critical locations in a network can be important enough to affect the overall quality. Whereas, a static analysis tool merely suggests which functions were called several times. In this study, the core functions will be elicited by using social network analysis and DEA (Data Envelopment Analysis) for CUBRID open database sources. In addition, we will suggest clear criteria for selecting the target sources for code inspection and will suggest ways to find core functions to minimize defects and improve performance.