체제전환국의 경제개혁과 초기조건이 경제성장에 미치는 영향분석

정형곤 한국비교경제학회 2003 비교경제연구 Vol.10 No.2

This study aims to analyze how the initial conditions and economic policies affect the economic growths of 25 countries that pursued system transformation using the covariance structure analysis. Likewise, mutual relationships among the variables were examined using the structural equation system. Based on the measured relations among the variables in the model, it can be inferred that economic recovery in the process of system transfol ination is largely affected by the latent variables of 'propensity for socialism' and 'economic outcomes of socialism.' In particular, 'repressed inflation' and 'existing period of planned economy' were critical factors. 'Income before the reform' and 'distortion of the industry' also affected economic recovery considerably compared to other variables. In addition, economic reform and inflation, which were defined as economic policies in the model, were found to be important variables for economic growth. Although the history of system transformation spans more than en years, most countries that pursued system transformation except Central European countries have failed to recover their previous GDP level before the system transformation. This is attributed to their initial conditions as socialist countries rather than the tardiness of the system, as attested by countries along the Baltic Sea that pursued system transformation and performed the same or more extensive economic reform and stabilization polices but still notably lags behind Central European countries in terms of economic recovery.

Y₂O₃함량에 따른 Al₂O₃- ZrO₂계 세라믹스의 특성

이형복,이홍림,홍기곤,김준태 연세대학교 산업기술연구소 1986 논문집 Vol.18 No.2

In this work the effect of Y₂O₃ content on Al₂O₃-ZrO₂ ceramics was studied and compared for coprecipitation and powder methods. Al₂O₃-ZrO₂ ceramics prepared by coprecipitation method showed the maximum M.O.R. value at 15 mole% ZrO₂ content for both 1.5 and 3 mole% Y₂O₃ addition, on the other hand, the ceramics prepared by powder method showed the increasing strength with increase of ZrO₂ content over the range of this work.

Zn₄GeSe_(6):Co^(2+) 單結晶에서 不純物 光吸收 特性

金亨坤,金柄哲,宋燦日 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2

In this work Zn₄GeSe_(6):Co^(2+) single crystals were grown by the C.T.R. (chemical transport reaction) method using high purity (6N) elements and iodine as a transport agent. The structure of the grown Zn₄GeSe_(6):Co^(2+) single crystals were monoclinic structure. The optical energy band gap was direct band gap and the temperature dependence of optical energy gap accorded well with the varshni equation. Optical absorption due to impurity in the Zn₄GeSe_(6):Co^(2+) single crystal was observed and described as originating from the electron transition between energy levels of Co^(2+) ion sited at T_(d) symmetry point.

사진의 사회적 기능에 대한 일고찰

김형곤 동명정보대학교 2002 저널 언론정보 Vol.1 No.-

관절원판 유착을 동반한 악관절 내장증 환자의 수술후 증상의 변화

김형곤,남광현,박광호,허종기,김일수,최희수 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.3

Purpose: The aim of this study was to find the clinical characteristics of the patients who had temporo-mandibular joint internal derangement(ID) with disc adhesion(adhesion group) compared to only disc displacement without disc adhesion, perforation, hyperemia, and so on(ID group) . Materials and methods: Thirty seven joints were included in adhesion group and 54 joints in ID group of all 174 patients(174 joints) treated surgically and had been checked periodically over 12 months at TMJ clinic of Yongdong Severance Hospital, Yonsei University, between 1992 and 1997. Mouth opening range, pain during mouth opening and biting, headache, neck/shoulder pain and TMJ sound were checked his/her every visit before and after surgery. Results: The maximum mouth opening was improved significantly after postoperative 3 months in two groups(p<0.01), but adhesion group was less improved. Pain during mouth opening was improved significantly over 3 months after surgery in adhesion group(p<0.01), but in ID group 1 month after surgery. Biting pain was improved and maintained it after surgery and not significant difference between two groups. Headache and neck/shoulder pain were much improved after surgery(p<0.01) , but slight relapse was found in adhesion group after 12 months. TMJ sound was more found in adhesion group after 1 month(p<0.05), but after 3 months, no significant difference was found between two groups. Conclusions: The postoperative results of adhesion group were worse than ID group. Therefore, it is considered more carefully to diagnose and treat in cases of internal derangement with adhesion.

伽耶式木槨墓의 一考察 : 昌原 道溪洞의 例

金亨坤 동의대학교 인문과학연구소 2000 인간과 문화 연구 Vol.5 No.-

미국 '적색공포'에 대한 일사례 연구 : 시애틀 총파업(1919.2)을 중심으로

金亨坤 中央大學校 史學硏究會 1995 중앙사론 Vol.8 No.-

악관절 질환의 진단에 있어 컴퓨터 적외선 체열 검사에 대한 연구

김형곤 대한두개하악장애학회 1992 대한두개하악장애학회지 Vol.4 No.1

The author had taken thermographs of 155 subjects, who visited Yongdong Severance Hospital from October 1988 to March, 1993 with TMJ pain and dysfunction and subsequently underwent either operative or surgical treatments. After analyzing thermographic patterns according to a degree of TMJ disc displacement, history, and clinical correlations, the author had made following conclusions. 1. In 155 patients who received either conservative or surgical treatment, 81.9% showed abnormal thermographic pattern at the site of complaint. 2. Sensitivity on thermography was observed in 82.6% of pain group and 85.4% of mouth opening limitation grpup with little difference between hyperthermic and hypothermic variations. 3. Internal derangements group showed no significant variation in thermographic pattern except hypothermic tendency in operation group with anterior displacement with reduction. 4. In patients with both muscleache and TMJ disorder, relatively high sensitivity (91.7%) was observed with diffuse thermographic pattern, whereas internal derangement patients showed localized pattern. 5. Application of D. I. T. I. may be practical as an adjunctive diagnostic method in TMJ disorder, especially in the differential diagnosis diganosis of muscleache and internal derangement, and in the localization of pain site.

기니픽에서 Magnesium의 혈관 이완과 혈압 하강 효과

김정곤,강형섭,김진상 한국수의공중보건학회 2003 예방수의학회지 Vol.27 No.2

The present study evaluated the effects of various agents on magnesium sulfate (Mg^(2+))-induced relaxation in aorta and blood pressure lowering in anesthetized guinea pigs. Mg^(2+) inhibited phenylephrine (PE)- or 40 mM KC1-induced sustained contraction of endothelium-intact (+E) guinea pig aortic rings in concentration-dependent manner. In preparations preconstricted with PE or KC1, Mg^(2+)-induced concentration-dependent relaxations. In preparations preconstricted with PE or KCl, Mg^(2+)-induced relaxations were not affected by the removal of endothelium (-E) and by the pretreatment of aortic rings with NO synthase (NOS) inhibitors (L-NAME and LNNA), guanylate cyclase inhibitors (methylene blue and ODQ, adenylate cyclase inhibitor (MDL), K^(+) channel blockers (glibenclamide and tetrabutylammonium), nifedipine or ryanodine. However, Mg^(2+)-induced relaxations were inhibited by Na^(+)-Mg^(2+) exchange inhibitor (imipramine) or removal (or attenuation) of extracellular Ca^(2+) in +E aortic rings. PE-induced contraction was not inhibited by nifedipine. In addition, Mg^(2+)-induced relaxations were inhibited by phospholipase C inhibitor (NCDC) or inositol monophosphatase inhibitor (lithium), but not by protein kinase C inhibitor (staurosporine). In vi패 infusion of Mg^(2+), directly into the femoral veins of guinea pigs, elicited sustained decrease in arterial blood pressure. The Mg^(2+)-lowered blood pressure was attenuated by intravenous administration of imipramine or lithium, but not by methylene blue, indomethacin, tetrabutylammonium nifedipine, LNNA, L-NAME or saponin (as an endothelium removal agent). These results suggest that endothelium independent vasorelaxant effect of Mg^(2+) on aortic ring appear to play important roles on the antihypertensive action in guinea pig, most likely via the inhibitory action of Mg^(2+) on the intracellular C^(2+) involve in PLC-IP pathway and influx (through the Na^(+)-Mg^(2+) exchanger) into the cell in guinea pig aorta.

고장력 열연강판의 드릴 가공시 공구마멸에 관한 연구

신형곤,김성일,김태영 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.2

Drilling is one of the most Important operations performed in the machining industry. And the material of the workpiece has a profound effect on the tool life, the surface finish produced and the overall economy of the process. Hot-rolled high strength steels have been used for automobile structural material, owing to high hardness and machinability of the material. However, in the drilling of hot-rolled high strength steels, the current knowledges of tool wear and machinability are insufficient. Therefore, it is desirable to monitor drill wear status and hole quality changes during the hole drilling process. Accordingly, this paper deals with the cutting characteristics of the hot-rolled high strength steels using common HSS drill. The performance variables include the drilling thrust, torque and drill wear data obtained from drilling experiments conducted on the workpiece. Also drill wear is measured by acoustic emission system and computer vision system.