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회전원통을 이용한 초고압 변압기의 유동대전에 관한 연구
곽희로,권동진,손철근 崇實大學校 生産技術硏究所 1993 論文集 Vol.23 No.-
This paper presents the measurement method using a spinning cylinder system for streaming electrification of transformer oil. The spinning cylinder system has a simple mechanical construction, and requires less oil compared to the other methods. Also, the effects of various admixtures on the static electrification properties of transformer oil can be easily investigated. Experiments showed that addition of the BTA reduced the streaming electrification and the polarity of static electrification was converted to negative at 50∼70[ppm] of BTA.
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장현식,박철근,손은주,김은경,곽진영,문희정,윤정현 대한초음파의학회 2016 ULTRASONOGRAPHY Vol.35 No.2
Purpose: The goal of this study was to evaluate the clinicopathological and imaging features ofthyroid nodules surgically diagnosed as hyaline trabecular tumor (HTT), and to assess the role ofcytology and frozen sections (FS) in the diagnosis of HTT. Methods: This study included 21 thyroid nodules in 21 patients treated from August 2005 toMarch 2015 (mean age, 53.3 years) who were either diagnosed as HTT or had HTT suggestedas a possible diagnosis based on cytology, FS, or the final pathology report. Patients’ medicalrecords were retrospectively reviewed for cytopathologic results and outcomes during the courseof follow-up. Sonograms were reviewed and categorized. Results: Twelve nodules from 12 patients were surgically confirmed as HTT. Ultrasonography(US)-guided fine needle aspiration (FNA) was performed on 11 nodules, of which six (54.5%)were papillary thyroid carcinoma (PTC) or suspicious for PTC and three (27.3%) were HTT orsuspicious for HTT. Intraoperative FS suggested the possibility of HTT in seven nodules, of whichfour (57.1%) were confirmed as HTT. US-FNA suggested the diagnosis of HTT in 10 nodules,of which three (30.0%) were confirmed as HTT. Common US features of the 12 pathologicallyconfirmed cases of HTT were hypoechogenicity or marked hypoechogenicity (83.4%), absence ofcalcifications (91.7%), parallel shape (100.0%), presence of vascularity (75.0%), and probablebenignity (58.3%). Conclusion: HTT should be included in the differential diagnosis of solid tumors withhypoechogenicity or marked hypoechogenicity and otherwise benign US features that have beendiagnosed as PTC through cytology.
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정용기,권동진,손철근,곽희로 한국조명·전기설비학회 1993 한국조명·전기설비학회 학술대회논문집 Vol.1993 No.-
This paper presents the measurement method using a spinning cylinder system for streaming electrification of transformer oil. The spinning cylinder system has a simple mechanical construction, and requires less oil compared to the other methods. Also, the effects of various admixtures on the static electrification and properties of transformer oil can be easily investigated. Experiments showed that addition of the BTA reduced the streaming electrification and the polarity of static electrification was converted to negative at 50~70[ppm] of BTA.
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김두석,권동진,손철근,곽희로 한국조명전기설비학회 1994 조명.전기설비 Vol.8 No.4
본 논문에서는 기존의 펌프나 가스를 이용한 강제유동식 시스템과는 달리 회전원통을 이용한 유동대전현상에 대하여 연구하여, 강제유동식에서의 대전특성과 비교, 분석하였다. 연구결과, 회전원통 시스템에서의 회전원통의 회전속도 및 온도에 따른 유동대전 특성은 강제유동식과 같은 경향을 보여 회전원통 시스템이 유동대전현상을 연구하는데 적합함을 알 수 있었다. 회전원통시스템은 강제유동식에 비하여 실험장치의 기계적 구조가 간단하고, 적은 양의 절연유만이 필요하며, 여러 가지 다른 물질로 실험하기가 비교적 편리하였다. 또한 대전 방지제의 첨가나 절연유의 열화에 따른 대전현상 등을 연속적으로 측정할 수 있는 특징이 있음을 알 수 있었다. This paper studied the streaming electrification with the spinning cylinder system, and compared and analyzed it with the conventional forced flowing system which used a pump or gas for oil flowing As results, in spinning cylinder system, characteristics of the streaming electrification to its rotational speed and oil temperature are same tendency as those of the forced flowing system and it showed the spinning cylinder system is useful to study the streaming electrification. The spinning cylinder system has a simple mechanical structure and needs smaller amount of insulation oil than the conventional forced flowing system and the ef fects of various materials on the streaming electrification could be investigated more conveniently than other methods.
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