• 한국정밀공학회지
• /
• 제19권8호
• /
• pp.77-83
• /
• 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.

• 한국군사과학기술학회지
• /
• 제4권2호
• /
• pp.138-146
• /
• 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.

• 한국콘텐츠학회논문지
• /
• 제5권5호
• /
• pp.10-16
• /
• 2005

정보를 생산하고 공유, 관리하는 방법이 디지털 방식으로 변경되고, 각종 문서의 정보들이 전자화된 문서로 변환되면서 활용도가 크게 높아졌을 뿐만 아니라 그 양도 증가함으로써, 모든 형태의 디지털 콘텐츠에 대한 효율적인 관리시스템을 필요로 하게 되었다. 콘텐츠관리시스템은 일관된 콘텐츠 저장 방법 및 관리 정책의 부재로 종합적인 콘텐츠 관리 및 콘텐츠 처리 지연과 콘텐츠의 질적인 저하를 가져오는 문제점이 있다. 본 논문에서는 멀티미디어 데이터를 효율적으로 처리하고 유비쿼터스 지식관리를 위한 ECM(Efficient Contents Management) 시스템을 제안하였다.

• 한국IT서비스학회지
• /
• 제19권2호
• /
• pp.83-92
• /
• 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..

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2002년도 추계학술대회 논문집
• /
• pp.151-154
• /
• 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.

• 한국공작기계학회:학술대회논문집
• /
• 한국공작기계학회 1999년도 춘계학술대회 논문집
• /
• pp.256-262
• /
• 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
• /
• 제41권2호
• /
• pp.77-81
• /
• 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.

• 한국산학기술학회논문지
• /
• 제7권6호
• /
• pp.993-997
• /
• 2006

본 논문에서는 현재 많은 관심을 모으고 있는 연료 중의 하나인 액화석유가스를 사용하는 1800cc LPG 자동차에 새로운 연료공급 및 제어장치를 적용하여 제어로직을 개발하였으며 또한 ECM(Electronic control module)을 장착한 자동차와 장착하지 않은 자동차의 배출가스특성을 비교하여 배기가스의 저감효과를 파악하였다.

• 한국균학회지
• /
• 제51권2호
• /
• pp.121-125
• /
• 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.

• 디지털콘텐츠
• /
• 11호통권126호
• /
• pp.160-166
• /
• 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.