• Journal of the Korean Society for Precision Engineering
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• v.19 no.8
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• pp.77-83
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• 2002

This research aimed at from the establishment of theory on micro electrochemical machining mechanism to the implementation of a practical fabrication system of micro parts. In detail, the mechanism of micro-ECM was investigated with potentiodynamic method and the optimal condition for micro-ECM was selected by voltage-current-time curve with potentiostatic method. From the experimental result, the micro part which has extremely fine surface could be fabricated by use of micro-ECM with point electrode method.

• Journal of the Korea Institute of Military Science and Technology
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• v.4 no.2
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• pp.138-146
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• 2001

The guided missile carries its own tracking radar to detect its target under noisy environments. The enemy warship uses the anti-missile electric-countermeasure(ECM) technique, such as chaff or decoy, so that the approaching guided missile could not destroy it. In this paper we propose the identification algorithm of a target signal when the enemy warship uses the chaff and decoy to deceive the guided missile. In the proposed scheme the mean square errors(MSE) between the received signals and the reference decoy signal, and between the received signals and the reference chaff signal are calculated. Then, the received signal which results in the maximum MSE is regarded as a warship signal. The performance of the proposed algorithm is verified through the computer simulation.

• The Journal of the Korea Contents Association
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• v.5 no.5
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• pp.10-16
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• 2005

Information producing and sharing methods are modified into digital forms. All kinds of documents are also converted into electronic forms so they become very useful and besides, they are increasing in quantity. Thus effective contents management system is requisite. Until now CMS(Contents Management System) has problems including composite contents management, processing delay and deterioration of contents because of deficiency of consistent contents storing methods and policies. In this paper an ECM(Efficient Contents Management) system is proposed for efficient processing of multimedia data and ubiquitous KM(Knowledge Management).

• Journal of Information Technology Services
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• v.19 no.2
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• pp.83-92
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• 2020

The current technology drain at small and medium-sized enterprises in Korea is very serious. According to the National Intelligence Service's survey data, 69 percent of technology leaks are made through employees of small and medium-sized enterprises. A document security system was introduced to compensate for the problem. However, small and medium-sized enterprises are not doing well due to their poor environment. Therefore, it proposes a document security system suitable for small businesses by developing a location information machine learning system that automatically creates a document security Green Zone through learning, and an ECM-based electronic document leakage prevention system that manages generated Green Zone information by reflecting it into the document authority system. And step by step, propose a universal solution through cloud services..

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.10a
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• pp.151-154
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• 2002

In this paper a mathematical model, the results of computer simulation and exprimental investigations of electrochemical machining with a too-electrode are presented. The experimental investigations were carried out in order to evaluate the influence of working voltage, initial interelectrode gap size, and metal remove rate. Accuracy of computer simulation evaluated by differences between results of experimental test and computer simulation depends on electrochemical machining coefficient, total overpotential of electrode process, current density, electrical conductivity of electrolyte, and etc. Metal removal rate would be predicted by the simulation of ECM process.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1999.05a
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• pp.256-262
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• 1999

By development of heat resistant alloy, there are much improvement of gas turbine engines. But heat resistant alloy has difficulty of machining. therefore, ECM (Electrochemical Machining) is used for Machining of 3 dimensional curved surface of Ni-base alloy. The purpose of this paper is to investigate ECM parameters that make tile good surface for Ni-base alloy blade. For this purpose, we have been investigated that center line average surface roughness(R$\sub$a/), average R$\sub$a/, Maximum R$\sub$a/ and Standard deviation of R$\sub$a/ for measuring positions is influenced on ECM parameters such as electrolyte types, dwell time, electrolyte pressure and sort of electrolyte for Inconel 718 and Waspaloy.

• Mycobiology
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• v.41 no.2
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• pp.77-81
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• 2013

This study aimed to investigate differences in ectomycorrhizal (ECM) fungal communities between disturbed sites and undisturbed old forest sites. ECM root tips of Pinus densiflora were collected from 4 sites disturbed by human activities and 3 undisturbed old forest sites adjacent to the disturbed sites. Results in this study showed that the number of ECM root tips, species diversity, and number of species were significantly higher in the disturbed sites than in the undisturbed sites, suggesting that the ECM fungal community structure was affected by the degree of disturbance.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.6
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• pp.993-997
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• 2006

This research presented experimental results obtained from the bench test of a 1800cc LPG vehicle, fitted with ECM for fuel supplying controlled system. The comparison study was made with non-ECM-equipped in terms of performances and emission characteristics. CVS-75 emission tests was conducted in order to meet emission regulations.

• The Korean Journal of Mycology
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• v.51 no.2
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• pp.121-125
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• 2023

In this study, we examined the ectomycorrhiza (ECM) formed by a species of the genus Tuber, T. koreanum, with two indigenous Korean oak species, Quercus acutissima and Q. dentata. T. koreanum showed a high colonization rate for both oak species, with a higher mean colonization rate observed for Q. acutissima. The mycorrhizal characteristics of T. koreanum were described, revealing distinct morphological and anatomical differences between the ECM formed with the two host plants. This study is significant because it is the first to elucidate ECM formations of T. koreanum in indigenous oak trees. However, further studies are required to differentiate the ECM associations formed by T. koreanum from those of other Tuber species.

• Digital Contents
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• no.11 s.126
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• pp.160-166
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• 2003

모든 조직들이 엔터프라이즈 콘텐츠 매니지먼트(ECM)가 필요한 것은 아니다. 도큐랩스(Doculabs)는 통합문서관리(IDM)의 개요와 각종 비즈니스 문제들을 해결할 때의 IDM의 역할에 대해 재조명해본다.