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Cone beam형 전산화단층촬영법을 이용한 하악과두의 골변화에 관한 연구
이지운,김형섭,송주섭,김경아,고광준 대한구강악안면방사선학회 2007 Imaging Science in Dentistry Vol.37 No.3
Purpose : To assess bone changes of mandibular condyle using cone beam computed tomography (CBCT) in temporomandibular disorder (TMD) Patients. Materials and Methods : 314 temporomandibular joints (TMJs) images of 163 TMD patients were examined at the Department of Oral and Maxillofacial Radiology, Chonbuk National University. The images were obtained by PSR9000N (Asahi Roentgen Co., Japan) and reconstructed by using Asahivision software (Asahi Roentgen Co.,Japan). The CBCT images were examined three times with four weeks interval by three radiologists. Bone changes of mandibular condyle such as flattening, sclerosis, erosion and osteophyte formation were observed in sagittal, axial, coronal and 3 dimensional images of the mandibular condyle. The statistical analysis was performed using SPSS 12.0. Intra-and interobserver agreement were performed by 3 radiologists without the knowledge of clinical information. Results : Osteophyte (2.9%) was found more frequently on anterior surface of the mandibular condyle. Erosion (31.8%) was found more frequently on anterior and medial surfaces of the mandibular condyle. The intraobserver agreement was good to excellent(k=0.78-0.84), but interobserver agreement was fair(k=0.45). Conclusion : CBCT can provide high qualified images of bone changes of the TMJ with axial, coronal and 3 dimensional images.
이형식,정준기,박태형 연세대학교 산업기술연구소 1983 논문집 Vol.15 No.2
The chatter analysis has been studied by many authors using non-linear. In this study, the stability chart obtained from experimental work with a lathe was qualitatively compared with the result of chatter analysis by non-linear theory. Experimental results verify that the stability of the machining process is affected by the width of cut in the following manner. As the chip width is increased from zero with the rotational speed of the workpiece kept constant, three ranges are distinguished; (a) unconditionally stable range, (b) conditionally stable range, (c) unstable range. In the conditionally stable range the system is stable for small disturbances but unstable when these exceed a certain level. When the chatter occurs, the amplitude initially increases and stabilizes itself at a finite level. This phenomenon agrees well with the analysis of non-linear theory qualitatively.
댐퍼붙이 거위목바이트를 使用하는 切削系의 動的 安定性에 關한 硏究
李炯植,鄭準基,盧光春 연세대학교 산업기술연구소 1982 논문집 Vol.14 No.2
The effect of the damped goose-neck tool upon the dynamic stability of machine tool was investigated. The dynamic stability of machine tool is directly related to the chatter in the metal cutting process. By the test of the dynamic characteristics for the damped goose-neck tool, theoretical approach of dynamic stability of machine tool is identified. It's results are compared with the results of actual cutting test. And the dynamic stability of machine tool is improved by the higher elasticity and the increase of damping coefficient for the damped goose-neck tool.
「주체사상」의 이데올로기적 기능 : 단합 기능과 동원 기능을 중심으로
李峻炯 경성대학교 1983 부산수산대학 논문집 Vol.4 No.4
The analysis of the ideological functions of the "Idea of juche" is seen to be very significant becaus edefinitions of ideologies are dealt with as the central themes of recent political researches and ideologies play a crucial role in the analysis of politics. The aims of this study are: (1) to explore whether the "idea" functions mainly as pure ideology or practical ideology: (2) to investigate how the solidarity function is concretely manifested, and (3) to examine how the mobilization function is concretely manifested. To fulfill these purposes, we avail ourselves of an analytic frame of reference based on Frans Schurmann's pure and practical ideology and Anthoney F. C. Wallace's goal and transfer culture. In the analysis of the functions of the "idea", we chsre solidarity and mobilization alone among several functions of ideology. Four drives or movements, which have been imposed on the North korean inhabitants, are given for the concrete manifestations of the two functions of the "idea". The results of the study are as follous: The "idea of juche" prvned to be transfer culture rather than goal culture in that the North Korean theoreticians have asserted that "all the lines and policies of our party are from and are carried out by the idea of juche:. But they have sought to enhance the "idea" toward pure ideology. Though it is difficult to make explicit which function relate exactly to which component of the idea, the relations between them are to be said. "Juche in ideology" and "independence in politics" prove to be more concerned with solidarity function, while "self-sustenance in economy" and "selfdefence in national defence" have a lot to do with mobilization function. The North Korean Communists didn't build up their regime on their oven but by the help of Soviet Russia and China. It is natural that their regime should lack authority, which solidarity function of the "idea" legitimizes. In other words, the "idea" helps to support the North Korean elite and to justify the exercise of power. The solidarity function is concretely manifested in the use of myths, the rewriting of history and the search for a utopia, which serve to promote the ends of the North Korean communist system. Most Communist transfer-culture goals require sacrifices of the population; commonly such goals are unpopular or entail means that are not popularly supported. They are accordingly imposed by a "revolution from above," which is very like Amitai's "societal mobilization." This mobilization has brought about a considerable degree of indiffrence and inertia among the North Koreans. The North Korean authorities have consequently attempted to maximize the effects of mobilization policies through the "idea". They have taken advantage of "chulima" movement and four military lines for the concrete manifestations of mobilization. It is concluded that through the "idea" Kim Il-sung, leader of the North Korean regime, has intended to consolidate his monolithic power and to maintain the supreme position of the Korean Workers Party.
국부 마모 부품을 위한 레이저 표면강화 열처리에 관한 연구
이목영,김형준,김기철,김재웅 한국레이저가공학회 2002 학술발표대회 Vol.2002 No.1
두께 10mn 일반기계구조용강재를 사용하여 레이저 종류에 따른 표면경화 열처리특성에 관하여 알아보았다. 경화층의 형성은 레이저의 종류에 크게 영향을 받았는데, 표면경화 열처리를 위해서는 파장이 짧은 Nd-YAG 레이저를 사용하는 것이 유리하였다. 경화층의 최고경도는 700Hv 가량으로 높게 나타났으며, 레이저 표면경화 열처리는 상온에서 사용되는 부품의 내마모성 향상 특히 국부 마모를 겪는 부품에 효과적일 것으로 판단되었다.