• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.05a
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• pp.1174-1179
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• 2001

차음성능 측정에 관한 국제간 신인도 향상을 위하여 home and away 테스트가 수행되었다. 동일 시편에 대한 비교 테스트 결과 대부분의 시편에서는 STC 1 ㏈ 이내의 차이를 보였다. 다만, 특정 시편의 경우 STC 5 ㏈의 차이가 발생하였다. 주원인으로는 잔향시간 측정 오차가 주원인으로 추정되며, 또한 부수적인 원인으로는 시편의 제작 및 설치의 차이 때문인 으로 사료된다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.12A
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• pp.1897-1903
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• 2000

산업용 칼라 액정 패널 비젼 시스템은 공장 자동화 시스템 및 고속도로 등의 모니터링을 위해 필요한 시스템이다. 본 논문에서는 산업용 액정 패널 비젼에서 입력신호인 NTSC, SECAM, PAL 및 컴퓨터의 RGB 신호를 받아 이를 그래픽 처리하여 LCD 패널에 디스플레이 하여 대형 스크린에 투사하기 위한 LCD 드라이버 인터페이스를 카드를 개발하였다. 개발된 인터페이스 카드는 XGA(1024X768)급의 성능을 가진다. 카드의 성능을 테스트하기 위해 적합성 시험을 하였으며, 테스트 결과 만족할 만한 결과를 얻을 수 있었다.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.694-697
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• 2020

본 논문은 언리얼 엔진에서 제공하는 Dedicated server를 사용하지 않고 자체적으로 제작한 IOCP모델 서버를 구축하고, 이를 언리얼 클라이언트와 MySQL데이터베이스에 연동하여, 완성된 서버의 성능 테스트를 진행한 결과를 보였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.687-690
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• 2008

오늘날 산업계에서 시스템 통합은 IT를 계획하는데 있어서 비용을 줄이고 효율성을 향상 시키기 위한 중요한 방법으로 부각되고 있다. 가상화의 장점은 단일서버에 다중의 운영체제를 통합할 수 있는 환경을 제공해 준다. 그러나 올바른 가상화 기술과 시스템 통합을 위한 가상화 구성방법 선택은 중요한 과제이다. 따라서 이 연구의 목적은 유닉스 시스템 가상화 기술을 설명하고 유닉스시스템 기반 상에서 벤치마킹 테스트 도구를 활용하여 HP 가상화 기술인 nPars, vPars, VM 의 성능을 비교테스트를 하고자 한다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.41 no.9
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• pp.97-106
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• 2004

A new test strategy for embedded SOC test is proposed. The SOC test is evaluated by the degree that is the amount of the total reduced test time. Since the test time for a embedded core is determined by the configuration of test wrapper, the total test time is decided by the length of the largest TAM used by the test wrapper. So the DFT(Design for Test) must be involved in the design flow. And the efficient test strategy must be settled. The all Previous test strategies are the methods that find a sub-optimal configurations of scan-chains to minimize the test time after the total TAM lines are divided into a few groups. But this is the NP-complete problem so that all attempts which examine such a TAM configuration and scan-chain division are impossible. In this thesis, a new methodology for this problem is proposed and the efficiency of the methodology is proved.

• Journal of KIISE:Software and Applications
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• v.36 no.6
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• pp.451-461
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• 2009

The Adaptive Random Testing(ART) aims to improve the performance of traditional Random Testing(RT) by reducing the number of test cases to find the failure region which is located in the input domain. Such enhancement can be obtained by efficient selection algorithms of test cases. The ART through Iterative Partitioning(IP-ART) is one of ART techniques and it uses an iterative input domain partitioning method to improve the performance of early-versions of ART which have significant drawbacks in computation time. And the IP-ART with Enlarged Input Domain(EIP-ART), an improved version of IP-ART, is known to make additional performance improvement with scalability by expanding to virtual test space beyond real input domain of IP-ART. The EIP-ART algorithm, however, have the drawback of heavy cost of computation time to generate test cases mainly due to the virtual input domain enlargement. For this reason, two algorithms are proposed in this paper to mitigate the computation overhead of the EIP-ART. In the experiments by simulations, the tiling technique of input domain, one of two proposed algorithms, showed significant improvements in terms of computation time and testing performance.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.15 no.4
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• pp.115-128
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• 2016

Many research activities to reduce accidents on the road and to improve traffic efficiency have been performed and almost research projects are developing technologies and services based on C-ITS technology nowadays. The main concept of C-ITS is improving road safety and traffic efficiency by sharing and reproducing information between various elements. To accomplish this goal, V2X communication technology has been adopted. In Korea, we have studied V2X communication technology in support of SMART-Highway research project and are managing test-bed to verify the developed technology recently. In this paper, we introduce SMART-Highway test-bed and show the procedure and result of V2X communication performance analysis on the test-bed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.10
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• pp.1947-1957
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• 2015

CCN networking is one of the future internet. With the rapid development of network platforms emerged a wide range of services through a virtual network environment. The performance of CCN in the high bandwidth delay is important to provide various services between nations. We can check the high bandwidth delay product in federation. Federation between the nations has the advantage of being effective to do a various services for the users, and the remote heterogeneous physical hardware engine supports various environments. Data transmission delay can be occur in long distance network even though the network is federated network. In this paper, we propose CCN-Helper protocol for data transmission delay in ling distance networks. We connect from KREONET in Korea to iLab.t in Belgique in order to test CCNx over heterogeneous federated environment.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.45 no.5
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• pp.180-191
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• 2008

An Adaptive Random Testing (ART) is one of test case generation algorithms that are designed to detect common failure patterns within input domain. The ART algorithm shows better performance than that of pure Random Testing (RT). Distance-bases ART (D-ART) and Restriction Random Testing (RRT) are well known examples of ART algorithms which are reported to have good performances. But significant drawbacks are observed as quadratic runtime and non-uniform distribution of test case. They are mainly caused by a huge amount of distance computations to generate test case which are distance based method. ART through Iterative Partitioning (IP-ART) significantly reduces the amount of computation of D-ART and RRT with iterative partitioning of input domain. However, non-uniform distribution of test case still exists, which play a role of obstacle to develop a scalable algerian. In this paper we propose a new ART method which mitigates the drawback of IP-ART while achieving improved fault-detection capability. Simulation results show that the proposed one has about 9 percent of improved F-measures with respect to other algorithms.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.2
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• pp.415-420
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• 2010

This paper describes the design overview of shared file system $SANique^{TM}$ and analyzes the performance evaluation results of I/O intensive stress test based on various cluster file system architectures. Especially, we illustrate the performance analysis for the comparison results between the $SANique^{TM}$ and the Linux file system EXT3 system that is used to generally in Unix world. In order to perform our evaluation, Oracle 10g database system is operated on the top of cluster file system, and we developed the various kinds of testing tools which are compiled by ESQL/C from Oracle. Three types of architectures are used in this performance evaluation. Those are the cluster file system $SANique^{TM}$, EXT3 and the combined architecture of $SANique^{TM}$ and EXT3. In this paper, we present that the results of $SANique^{TM}$ outperforms other cluster file systems in the overhead for providing the true sharing over the connecting server nodes.