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복잡한 유동장에서도 신뢰성 있는 5공프로브 널링기법의 개발
김진권,강신형,Kim, Jin-Gwon,Gang, Sin-Hyeong 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.11
Since a non-nulling method of five-hole probes is valid only when the flow angle is within the calibrated angle range, it can not be used in a complex flow field. Full angle range pressure coefficient maps show that widely used nulling methods do not guarantee correct alignment of the probe with the flow direction in the unknown complex flow field. Zone decision method and features of zone map were studied by investigating the full angle range pressure coefficient maps. A reliable and efficient new nulling algorithm using zone decision by pressure ordering is proposed and verified. Since the zone decision method by pressure ordering can decide whether the flow is within the calibration angle range or not, it is useful in wide angle nonnulling methods, too.
5공프로브의 전 각도 범위 압력계수 지도와 새로운 보정계수
김진권,강신형,Kim, Jin-Gwon,Gang, Sin-Hyeong 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.11
Pressures of a five-hole probe were measured for a full range of yaw and pitch angles and complete pressure coefficient maps were obtained. Based on these maps, various features of five-hole probe pressures were revealed and new five-hole probe calibration coefficients were devised. The new calibration coefficients show non-diverging characteristics for any flow direction and one-to-one correspondence for a wide range of flow angles. These calibration coefficients expand the valid flow angle range of five-hole probe calibration by .+-.10 degrees and complement a critical defect of five-hole probe zone-division calibration method which has not been known yet. Moreover new non-diverging calibration coefficients have advantages in nulling methods, too.
김진권(Jin Gwon Kim),목혜수(Hae Soo Mok),권경술(Kyung Sool Kwon),정태안(Tae Ahn Chung) 대한피부과학회 1985 대한피부과학회지 Vol.23 No.6
Progressive idiopathic atrophoderma of Pasini and Pierini is an asymptomatic atrophic disorder of the skin characterized by sharply demarcated, slightly depressed and slate-gray to brownish patches. The affected skin may be thin but of normal consistency. We herein described a 32-year-old female who showed on the trunk and extremities well-defined, brownish and atrophic areas without induration, but the central portion of the abdominal lesion was slightly thickened. Histopathologic findings showed slight thinning of the epidermis and dermis with mild perivascular infiltrate, however, the central portion of the abdominal lesion showed a focal, slightly sclerotic change of the collagen fibers.
김진권(Jin Gwon Kim),권경술(Kyung Sool Kwon),정태안(Tae Ahn Chung) 대한피부과학회 1986 대한피부과학회지 Vol.24 No.3
A 23-year-old man had multiple small, skin-colored firm papules on the both sides of the nasolabial folds since the age of approximately 17. His mother had a similar skin lesions on her face. The histopathological findings of skin biopsy specimens from patient(son) showed horn cysts consist of a fully keratinized center surrounded by basophilic cells and tumor islands composed of basophilic cells arranged in a lacelike or adenoid network and occasional solid aggregates and there are also a foreign body giant cell reaction in the vicinity of the ruptured horn cysts.
강신형,김진권,이승배,Gang, Sin-Hyeong,Kim, Jin-Gwon,Lee, Seung-Bae 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.4
Unstable performance deterioration was found on the performance curve of a small propeller fan with a back plate. To investigate this phenomenon and the effects of the back-plate on the performance of the fan, performance tests and flow measurement using 3-hole pitot tube were carried out. Measurements showed that when the flow rate is small, the radial flow dominates, and when the flow rate is large, the axial flow dominates. Performance characteristic of the propeller fan changes from radial to axial type as the flow rate increases. Unstable performance changes are the result of type change of the flow through the fan.
1-브로모실라트란의 $SnBr_2$ 에 대한 산화성 첨가반응 연구
김명운,어동선,신호철,김진권,도영규,Kim, Myeong Un,Eo, Dong Seon,Sin, Ho Cheol,Kim, Jin Gwon,Do, Young Gyu 대한화학회 1994 대한화학회지 Vol.38 No.3
산화성 첨가반응을 이용하여 실라트란(분자내 Si-N고리횡단 상호작용을 갖는 5-배위의 규소화합물)의 규소원자와 주족원소간에 Si-M 결합작용이 있는 새로운 이종다핵 화합물을 합성하려고 시도하였다. 1-브로모실라트란(1a)과 $SnBr_2를 반응시켜 노란색(2a)과 흰색(2b)의 고체 혼합물을 얻었고 용해도 차에 의해 각각을 분리하여 ^1H-NMR, ^{29}Si-NMR, ^{119}Sn-NMR, Mass스펙트럼으로 규명한 결과 노란색 화합물만이 Si-Sn결합을 갖는 것으로 판명되었다. SnBr_2를 1-브로모-3,7,10-트리메틸실라트란(1b)과도 반응시켜 Si-Sn 결합을 갖는 화합물, N[CH_2CH(CH_3)O]_3SiSnBr_3(CH_3OH)_2(3)$을 분리하여 여러가지 방법으로 확인하였다. The oxidative addition reaction has been employed to synthesize heteropolynuclear compounds containing Si-M bonding interaction between the silicon atom of silatrane, pentacoordinate silicon derivative with transannular Si-N dative bond, and the main group element. The reaction of $SnBr_2 with 1-bromosilatrane(1a) in acetonitrile gives the mixture of yellow(2a) and white(2b) solids which were isolated and charaterized by ^1H-NMR, ^{29}Si-NMR, ^{119}Sn-NMR and Mass spectroscopy. The yellow compound was characterized as 1-tribromotinsilatrane which had Si-Sn bonding interaction. The reaction of SnBr2 with 1-bromo-3,7,10-trimethylsilatrane(1b) in methanol gives the Sn(Ⅳ) complex, N[CH_2CH(CH_3)O]_3SiSnBr_3(CH_3OH)_2(3),$ which was characterized by various means.
권경술 ( Kyung Sool Kwon ),이태경 ( Tae Kyung Lee ),김진권 ( Jin Gwon Kim ),정태안 ( Tae Ahn Chung ),( Tetszi Mitsui ) 대한피부과학회 1986 대한피부과학회지 Vol.24 No.5
We present a case of mycosis fungoides of an 52-year-old woman who showed multiple pruritic erythematous papules, plaques with ulcers on the trunk, extremities and face. Her skin biopsy specimens were studied irnmunohistochemically with, monoclonal antibodies against T cells(80%, Leu-4, OKT11), T-cell subsets (60% Leu-3a, OKT4a, 40% OKT8) and Langerhans cell(OKT6). We think that this case should be considered in the differential diagnosis of adult T-cell leukemia/lymphoma. The proliferating cells were negative for anti-Tac.