• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1987.06a
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• pp.1-18
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• 1987

윤활유 첨가제는 윤활기유의 물리적, 화학적 성질을 보완 또는 강화시킴으로서 윤활유로서 소기의 목적을 달성케하도록 첨가하는 원유증유분이 아닌 화학물질로서 그 종류는 사용목적에 따라 많은 종류가 사용되고 있다. 현재는 년 300 ton 규모의 pilot-plant 에서 5종의 첨가제 시제품을 생산하여 이들의 additive package를 제조하고 VI improver, pour point depressant 등 기타 첨가제들과 혼련시켜 10W-30 SF/CD 급의 내연기관용 윤활유 제조를 위한 혼련기술을 개발중에 있다.

• Journal of the KSME
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• v.32 no.11
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• pp.938-946
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• 1992

간략하게나마 기어유를 중심으로 한 공업용 윤활유 첨가제의 역할에 대하여 살펴 보았다. 공업용 기어유의 금후 과제로서는 성(省)에너지형 개발이 일단락된 지금, 공업용기어유 분야에 커다란 기술적 과제는 없으나 단지 보수관리에는 비용을 비롯하여 성능관점으로 미루어 볼 때, 합성윤 활유의 검토도 한 번 쯤 생각하여 볼 가치가 있다고 사료된다. 또한 첨가제 문제에 있어서는 금후 지구환경 오염 규제강화 등에 있어서 사용을 제한하는 화합물이 있을 수 있는 가능성이 있는 것으로 주의를 게을리 하여서는 안 될 것이다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2003.10a
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• pp.53-53
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• 2003

유도 결합 플라즈마는 비교적 간단한 방법으로 1$\times$$10^{10}$㎤ 이상의 높은 플라즈마 밀도, 저용량 결합(low capacitive coupling), 대면적 균일성을 제공하기 때문에 플라즈마 공정의 관점에서 매우 효율적이다. 따라서 유도 결합 플라즈마의 이러한 장점들은 화학적 기상 증착법으로 적용하였을 때 코팅의 특성을 향상시키는데 매우 유리할 것으로 생각된다. 특히, 좋은 특성을 가진 carbon nitride 박막을 제조하기 위해서 높은 밀도를 이용한 반응 기체의 분해와 상온에서의 증착이 필수적인데, 유도 결합 플라즈마 공정은 이런 점에서 매우 효과적이다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.745-747
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• 2001

인터넷과 개인휴대통신의 발달과 더불어 유.무선 인증서비스는 PKI틀 기반으로 다양하게 구현되고 있다. 그러나 유.무선이 혼재된 형태의 통신망에서 Client간의 통신에 필요한 인증체계에 대한 연구는 초기단계이며 특히, Ad Hoc 통신망과 같이 가변적인 Topology를 형성하는 특수한 상황에서 지속적인 인증서비스를 제공할 수 있는 연구는 미미한 실정이다. 국가비상사태와 같은 긴급을 요하는 상황에서 신속히 구성되는 무선 Ad Hoc 통신망을 기반으로 한 인증체계를 구축하기 위하여 인증서 검증모델을 중심으로 유.무선PKI 통합모델을 제안한다.

• Journal of Navigation and Port Research
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• v.38 no.4
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• pp.379-384
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• 2014

In case of sunken tankers, remaining-oil recovery operation should be conducted due to possible oil spill accident. However, the deep sea operation make difficulties in checking the completion of remaining oil recovery process, therefore the work termination procedure is very important. In this paper, a reasonable work termination procedure through the comparison and analysis of two cases(Youil No.1 and Osung No.3, Kyung-Shin) which were performed in different method, using disparate equipment. By investigating previously applied methods and techniques, work speed, safety and expenses were compared. The proposed ending procedure of the remaining-oil recovery project is to recover the remaining oil from each cargo tanks and to clean up such tanks whilst an independent surveyor proceeds to a confirmation procedure whereby said surveyor checks out whether any remaining oil exists by putting a stick in each cleaned up tanks and opening up the hatch cover of the tanks or the top place of the tanks to confirm the cleanness of oil. Such procedure shall be done through discussion by the ordering party, contractor and the independent surveyor all together with a flexible application.

• Journal of the Korean Society of Radiology
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• v.10 no.3
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• pp.201-206
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• 2016

Social interest in breast cancer has increased. The most basic exams for diagnosis include breast X-ray and breast ultrasound. In particular, breast microcalcification requires histological diagnosis, and breast microcalcification biopsy is commonly performed. Therefore, this study aimed to analyze and assess X-ray guided biopsy (needle localized open biopsy) and ultrasound guided biopsy (sono guided core needle biopsy), which are basics in diagnosis of microcalcification. Targeting 241 cases in which magnification mammography was performed for patients who visited the hospital due to breast microcalcification, age distribution and the location of lesions were analyzed in X-ray guided biopsy and ultrasound guided biopsy. By classifying exams performed after magnification mammography, the frequencies of X-ray guided biopsy and ultrasound guided biopsy were analyzed, and malignant and benign results were confirmed. The results showed that 64 cases(26.6%) were X-ray guided biopsy, which was 5.4 times higher than 12 cases(4.9%) of ultrasound guided biopsy. Due to development of ultrasound equipments, stereotactic vacuum-assisted biopsy, etc. the methods of histological diagnosis of microcalcification have become diverse, but when considering characteristics and limitations of each exam, X-ray guided biopsy is thought to be most accurate and useful.

• (The)Study of the Eastern Classic
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• no.50
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• pp.233-259
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• 2013

This study aims to identify the concept of "You(游)" as the aesthetic attitude in the Traditional Chinese Painting Theory. Traditional painting has a purpose to spread painting spirits and have consistently pursued "Xin(神, spiritual being)" as the truth of a thing. However, the contents of "spiritual being", "form" and "qi" that "describe the spiritual being" have been changed. Therefore, although the theory of form and spirit can be a way to explain chinese paintings, there is a limitation to actively explain the changes in description of spiritual being. In order to find out the basis to explain the changes of spiritual being as the truth of a thing, this study investigated the concept of "You(游)" as the attitude of the artist focusing on "experiences in painting". "Tuhua Jianwenzhi" and "Linquan Gaozhi" in the Song Dynasty adopted the attitude of "You" to explain the painting theory and proceeded exploration on things with the attitude to pursue the "truth" of a thing described in "Eye of Painting" and "KuguahuoshangHuayulu". The aesthetic values generated in the attitude of "You" refer to "qing si(情思)" and "yi si(意思)" in Song Dynasty; "gao yin zhi si (高隱之思)" in the Meng Dynasty; and the law of "one stroke(一?)" in Qing Dynasty.

• 우유
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• s.29 summer
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• pp.13-16
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• 1987

• Monthly Korean Chicken
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• v.37 no.31 s.97
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• pp.66-67
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• 2003

• Monthly Korean Chicken
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• v.42 no.36 s.102
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• pp.70-71
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• 2003