Precision lingual Arch를 이용한 구치부 교차교합(scissor bite) 치험예

전윤식,조기수,오준승 의치학사 1991 치과임상 Vol.11 No.12

Many orthodontists and general dentists have suffered from scissor bite which means a type of posterior cross bite, exhibiting linguoversion of lower molar and buocoversion of upper molar. Criss-cross elastic has been used to correct this problem but this method has many side effects. For example, extrusion of involved tooth and opposing apron. tooth, those induce increasing vertical dimension and rotating the mandible forward and downwardly. To reduce the bite raising, occlusal reduction and endodontic therapy must also be done. The other way is the conventional Lingual arch ( sheath type ) as an anchorage and sectioal wire to upright the involved tooth. Unfortunately, for interfering with the bite it is impossible to weld or bond the tube to the buccal side of tooth. To correct the scissor bite precisely the precision lingual arch was developed recently by Dr. Burstone ( 1988 ). The precision lingual arch uses a pretorqued .032 ' X .032 ' wire that fits accurately into a pretorqued .032 " slot. Stiffness can be varied by choosing either a stainless steel wire for high stiffness or TMA for low stiffness. Unilateral torque can be used to correct molar cross-bite. The distance across the lower arch is so great that the vertical side effects are small and would likely be eliminated by the force of occlusion. The next two scissor bite cases were corrected using the precision lingual arch.

속도 센서가 없는 유도 전동기의 퍼지 제어 방법에 대한 연구

全光鎬,朴俊烈 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.2

In the vector controlled induction motor drives which are widely used in recent years, the speed information becomes mandatory. However, installing the speed sensors on the existing motors costs much, and is not easy under certain environment. In addition, several sensor noise can happen to make the wide applications of the high performance vector controlled induction motor drives restricted. In this paper, we propose fuzzy control algorithem for control torque of induction motor without speed sensor. The prorosed controller shows a good dynamic response and decoupling characteristics.

여성 골프 스타 모델의 이미지 속성차원에 따른 광고모델의 차별화 분석 : Focused on Golf Stars

천영일,홍준기 中央大學校 韓國敎育問題硏究所 2000 韓國敎育問題硏究所論文集 Vol.- No.15

The purpose of this research is to find the factors (image elements and image levels) that mostly influence the endorsement power by power measurement of sports stars as advertisement endorsers through their image analysis. For this purpose, we chose golf as an advertisement sport and golf club as an advertising product, selected sports stars(Seri Pak, Mihyun Kim, Jiyun Park) for golf club advertisement model, and investigated a model selection method which we designed by applying the method, 'measurement of the endoresement power factors of sports stars by their image analysis'. Concrete research objectives are as follows: 1) to ascertain the sub factors of image construction 2) to identify image levels of factors that affect the attitude toward advertisements and advertising products. We conducted a questionnaire survey of 313 students(151 men and 162 women) in C university and reached the following conclusions: 1) Seri Pak has familiar and popular image and appeals to purchasers by her powerful image, so when we apply her to advertisement, we should consider these facts. 2) Mihyun Kin is characterized by her cheerfulness, social image, and familiarity, so we need a marketing strategy that emphasizes these points. 3) Jiyun Park is a player worthy of utilization in marketing by her western image such as generous and active characteristics.

유도 전동기를 위한 자기 동조 퍼지 제어기 설계

전광호,하남수,박준열,김상윤 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.2

The conventional PI control, that are used in the control loop for outer speed of the induction motor, also has difficulty dealing with the dynamic speed tracking, parameter variation, and the load disturbance. As a result, the motion control system operates with a poor performance in the motor´s low speed range. In this paper, a novel speed control system that implements the fuzzy logic controller(FLC) is proposed. The proposed FLC used the speed error, its rate of change, and the drive current as three fuzzy variables. The real command output current is chosen by the defuzzification of the fuzzy output extracted from the fuzzy control rules. The flux and the torque of the induction motor are estimated using the dynamic model with an excellent dynamic response over a wide speed range and with the rotor flux field-oriented scheme of the decoupling characteristics. The performance of this control system is substantiated by computer simulations.

블랭킹 공정에서 연성파괴 예측

鄭準基,曺性郁 弘益大學校 科學技術硏究所 2001 科學技術硏究論文集 Vol.12 No.-

This study is focused on the description of ductile fracture initiation, which is needed to predict product shapes in the blanking process. In order to accurately simulate sheet-metal cutting processes by shearing mechanism, such as blanking and punching processes, a finite element model has been developed for the numerical description of such processes. Damage and crack propagation have been taken into account by means of an elastoplastic constitutive law. To investigate the effects of variation of processes parameters on the geometry of sheared edges and the force-punch penetration evolution, we have implemented the algorithm of calculation by means of ABAQUS/Standard finite element code. Result of the FEM simulation agrees will with the experimental one.

계층적인 탐색점 배치와 화소 간축을 이용한 움직임 추정 기법

박준호,류명춘,김준한,김신희 경운대학교 산업기술연구소 1999 産業技術硏究論文誌 Vol.1 No.1(B)

In motion estimation of moving pictures compression, fast block matching method using hierarchical search point displace and the pixel decimation is supposed. The method is based on TSS(Three step Search) method and pixel decimation. This method improves image quality and local minima by increasing search points, but operation counts that resulted from increasing search points are reduced by the pixel decimation method. So, the method can improve image quality and operation counts are nearly the same with TSS. MP@ML video is simulated by this method, which shows good results compared with TSS.

퍼지 PI 제어기를 이용한 유도 전동기의 속도 제어에 대한 연구

박준열,전광호 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-

The conventional PI control, that are used in the control loop for outer speed of the induction motor, also has difficulty dealing with the dynamic speed tracking, parameter variation, and the load disturbance. As a result, the motion control system operates with a poor performance in the motor's low speed range. In this dissertation, a novel speed control system that implements the fuzzy logic controller(FLC) is proposed. The proposed FLC used the speed error, its rate of change, and the drive current as three fuzzy variables. The real command output current is chosen by the defuzzification of the fuzzy output extracted from the fuzzy control rules. The flux and the torque of the induction motor are estimated using the dynamic model with an excellent dynamic response over a wide speed range and with the rotor flux field-oriented scheme of the decoupling characteristics. The performance of this control system is substantiated by computer simulations.

다구찌 실험계획법을 이용한 드라이 선삭가공의 최적 가공조건 선정

송춘삼,김준현,김주현 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-

Recently, various efforts to make more speedy and precision machine tool to improve productivity and also various efforts to solve environmental problem are going on, so that dry cutting in manufacturing industry, which needs environmental conscious design and development of manufacturing technique, is becoming a very important assignment to solve. Because dry cutting does not use cutting fluid, we need other methods that can be used instead of cutting fluid, which does cooling, lubricating, chip washing, and anti-corrosion. Especially, because turning is a continuous work, the consideration of tool life and surface roughness due to continuous heat and poor lubrication is important. The purposes of this paper are the consideration of how well the compressed air can work instead of cutting fluid, and also the development of the method to select the optimum machining condition by the minimum numbers of experiments through the Taguchi method.

도시 노숙자의 주요 정신장애에 관한 역학 연구

안준호,홍진표,유제춘,박종익,이철,한오수 大韓神經精神醫學會 2001 신경정신의학 Vol.40 No.2

외환위기 이후 대도시를 중심으로 노숙자들이 급증하여 이들이 심각한 사회문제로 등장하였다. 외국의 연구에 의하면 노숙자 중 상당수가 만성 정신질환을 앓고 있으며, 정신질환이 노숙의 원인 및 예후와 밀접한 관련이 있다고 한다. 그러나 국내에서는 아직 노숙자의 정신장애의 유병률에 관하여 알려진 바 없으므로 이에 대하여 조사하였다. 방법: 1998년 말부터 1999년 초까지 부산지역의 쉼터 두 곳에 거주하는 노숙자 216명을 대상으로 인구학적 자료에 대한 설문조사를 한 뒤 Structured Clinical Interview for DSM-Ⅳ(SCID)을 이용하여 Axis Ⅰ의 주요 정신장애를 진단하였다. 이들의 정신장애의 평생유병률 및 현재유병률을 국내 일반인구 및 외국 노숙자의 정신장애의 유병률과 비교하였다. 결과: DSM-Ⅳ Axis Ⅰ의 정신장애 중 기분장애, 정신병적 장애, 물질사용장애에 대한 진단 평가 결과 상기 정신장애의 전체 평생유병률은 60.1%, 현재유병률은 35.7%이었다. 그 중 주요우울장애의 평생유병률 이 22.5%로서 외국의 노숙자에 대한 역학연구 결과와 비교해 볼 때 높은 수준이었고 알코올 사용 장애의 평생유병률은 47.4%이었다. 정신병적 장애의 평생유병률은 3.8%이었고, 그 중에서도 정신분열병의 평생유병률은 1.9%이어서 외국의 노숙자에 대한 연구결과보다 낮은 편이었다. 결론: 국내 노숙자에서 기분장애와 물질사용장애가 주된 정신장애였으며 정신분열병 등 정신병적 장애의 유병률은 외국에 비해 낮은편이었다. 이러한 정신장애를 가지고 있는 노숙자에 대하여 접근하고 치료하기 위한 대책이 마련되어야 할 것이다. Objective:As homeless people increased in urban areas after the economic crisis in Korea, they became a serious social problem. Foreign research showed that many homeless people had chronic mental illnesses which were closely related with the cause and prognosis of homelessness. But very little was known about the prevalence of mental disorders in Korean homeless people. This study tried to capture the overall picture of mental disorders in homeless people. Method:The study subjects were 216 homeless people who stayed at two Pusan shelters between late 1998 and early 1999. Questionnaires on sociodemographic data were administered to the subjects, and then diagnoses of major DSM-IV Axis I mental disorders were made using Structured Clinical Interview for DSM-IV Axis I Disorders(SCID). The lifetime and current prevalence of mental disorders in this study were compared to those from other studies in Korean general population and in foreign homeless people. Results:The lifetime prevalence of major DSM-IV mental disorders(mood disorders, psy-chotic disorders, and substance use disorders) of 216 homeless people was 60.1%, and current prevalence was 35.7%. The lifetime prevalence of major depressive disorders was 22.5% which was higher than that of foreign studies. The lifetime prevalence of alcohol use disorder was 47. 4%. The lifetime prevalence of psychotic disorders was 3.8%, and among them the lifetime prevalence of schizophrenia was 1.9% which was lower than that of foreign studies. Conclusions: In Korean homeless people, mood disorders and substance use disorders were the main mental disorders and psychotic disorders such as schizophrenia were less than in foreign homeless people. The plans to approach and treat homeless people with mental disorders should be made.

Purge & Trap-GC를 이용한 의약품 필름코팅 정제 중 잔류용제에 관한 연구

장준식,이명자,소유섭,문춘선,이주헌,박희라,김진숙,강경모,이선옥,방성연,유미자,유문균,금오성,이병욱 식품의약품안전청 2000 식품의약품안전청 연보 Vol.4 No.-

의약품은 약물을 생체에 적풋하기 위하여 유효성분의 효과가 언제나 일정하게 확보되고 사응에 편리하도록 만들어지는 것이므로 유효썽분 이외에 약효에 영향을 주지 않는 성분이 첨가되는 경운가 많다. 이 때 사용되는 용매들은 제피의 광택 및 건쪼시간의 단축 등을 위하여 휘발점이 낮을 용매들이 주로 사용되어진다. 본 연구는 의약품 필름코팅정제 중 잔류용매 4종(chlorofonr benzen, trichloro ethylen, 1,4-dioxane)에 대한 변형된 pirge & trap-GC 장치를 이용한 동시분석방법을 개발하였으며, 각 표준품의 RSD 값은 chloroform 3.03%, benzen 3.17%, trichloroethylen 3.69% and 1,4-dioxane 3.41%였다. 또한 시중 유통중인 의약품 50종에 대하여 잔류웅매 양을 측정하였으며, 검출되는 잔류용매는 한 건도 없었다. This study nras carried out to develope the analytical method for the mixture of chlorefonn, benzen, trichloroethylen and 1,4-dioxane simultaneously and determine the remainingorgauic solvents in coating tablets by Purge & Trap-GC. The results were as follouFs ; 1. Chloroform, benzen, trio:tloroethylen and 1,4-dioxane separated by tenax #5 trap by HP-624GC column by terrlperature programming. The peaks were separated completely at retentiontime of 6.88min for chloroform, 8.21min for benzen, 10.38miu for trichloroethylen and 11.95minfor 1,4-dioxane. 2. Standard RSD were individually chloroform 3.03%, benzen 3.17%, trichloroethylen 3.69%and 1,4-diorane 3.41%. 3. 60 samples were not detrcted chloroform, benzen, trichloroethylen and 1,4-dioxane.