DESIGN OF A DISC-ON-DISC-TYPE CNC TRIBOMETER TARGETED AT DRY CLUTCH FRICTION PLATE WEAR CHARACTERIZATION

Matija Hoić,Mario Hrgetić,Nenad Kranjčević,Milan Kostelac,Joško Deur,Andreas Tissot 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.1

The paper presents design of a disc-on-disc-type CNC (Computer Numerical Control) tribometer aimed at experimental characterization of friction and wear behaviors of automotive dry clutches. The torque or ormal force, slip speed, friction interface temperature, and closing time are accurately controlled during tests by employing rotational- and vertical-axis servodrives and a water-cooling system built in both axes. A compact two-axial piezoelectric torque and force sensor is built in between the vertical-axis spindle and the pressure plate, in order to provide direct measurements of friction torque and normal force. The slip speed is sensed by using an encoder placed at the rotating table that carries the friction plate. The disc temperature is controlled by means of imposing a delay between two consecutive clutch closing cycles, variable cooling pump speed, and a valve that can bypass the coolant flow around the pressure plate. The torque control ystem is realized in a cascade structure including inner normal force and vertical axis speed controllers. The closing time is controlled by means of “electrical inertia” implemented through rotational-axis servomotor torque control. The tribometer performances are demonstrated through a study of dry clutch friction plate wear rate characterization.

제조물책임 제도와 대학의 품질보증 전략에 관한 연구

이회식 한국생산성학회 1999 生産性論集 Vol.13 No.3

In the universities as well as enterprises, it's the time to enforce systematically quality competition for the internal and external customer satisfaction. The essential substance of the product liability system is that the supplier should have the liability to the suffering damages that come from defective products. The product liability system is an active consumer protection system being enforced in many of the advanced nations. In the same way, one of the essential role of university management is to cultivate men to fulfill the fundamental needs of the nation. Universities have to recognize the quality assurance concept in cultivating men and to improve their productivity in all aspects. This paper concludes that with the change of recognition and the improvement of constitution the emphasis should be on the importance of quality assurance not only for enterprises but also for universities.

수종의 구강위생 방법에 따른 인공 초기 우식법랑질의 재석회화에 관한 비교 생체연구

정희민,김용기 大韓小兒齒科學會 1991 大韓小兒齒科學會誌 Vol.18 No.1

With a view to evaluating the effect og topical fluoride application in vivo,enamel slabs taken from artificial carious lesion produced by Hydroxuethylcellulose system were mounted in acrylic mandibular removable appliances and worn by 4 male subjects for two weeks.Control subjects brushed 4 times a day with non-fluoridated dentifrice.Experimental subjects also brushed 4 time a day but wash MFP dentifrice(G2),plus 0.05% NaF mouthrinsing(G3) or with MFP dentifrice plus 0.05% NaF mouthrinsing.After performing different oral hygiene regimen,surface morphology and histological profile in depth along with Ca,P content in layers were studies using SEM,polarizing light microscope,EPMA,EDX and WDX. The results were as follows: 1.Remineralized lesion in all groups showed smoother and less porous surface than original carious enamel lesion. 2.Under polarzing light microscope,artificial carious lesion showed typical subsurface demineralization; The lesion body showed positive birefringence,and the inner sound enamel and intact surface layer showed negative birefringence.When compared to the original lesions,remineralized artificial carious lesion showed decresed lesion depth with increased thickness of intact surface.This features were more distinct in the case of topical fluoride application group(group 2,3,4).The body of remineralized lesion in group 1,2 revealed continuous pattern,whereas group 3 and 4 showed interruped charicter. 3.From Ca & P profile analyzed by WDX,maximum mineral loss of most lesions was showen to be detected at around the area of 80㎛ from surface roughly.The intergroup rank of remineralizing rate besed on WDX data in descending order was group 4,3,2 and 1.

共同相續財産의 分割에 관한 硏究

李會圭 강남대학교 사회과학연구소 1999 사회과학논총 Vol.7 No.-

韓國 養子法에 관한 小考 : 改定 親養子法(案)을 중심으로

이회규 강남대학교 사회과학연구소 2001 사회과학논총 Vol.12 No.-

相續回復請求權의 法律的 性質과 第3者 保護

李會圭 강남대학교 사회과학연구소 2001 사회과학논총 Vol.11 No.-

Thomas Hardy의 Far from the Madding Crowd에 관한 硏究 (Bathsheba의 유순화)

金會珍 서울市立大學校 1992 論文集 Vol.26 No.-

There is a great deal of complexity about Thomas Hardy's literature, for the two contrasting factors exist in his skill of laying out the literary material. But in his works it can be found that those contrasting factors are presented as the main sources of his ambivalent literature. The purpose of this paper is to find Bathsheba's taming in Far from the Madding Crowd and to define it as a Bildungsroman. Most of Hardy's world of literature is a tragedy caused by want of harmony between the two contrasting factors. But his earlier work, Far from the Madding Crowd ends in a happy ending. And there Bathsheba's taming is accomplished by the balance between realism and fantasy. The taming is on the same level with a hero's Building in his character and environment emphasized in most of the English Bi-ldungsromans. Here I came to the conclusion that Far from the Madding Crowd, unlike his later works, is transformed into a kind of Bildungsroman.

불어에서 동사의 보어 a`+N의 통사적 특성 : Maurice Gross의 'Me´thodes en syntaxe'중심으로 dans "Me´thodes en syntaxe" de Maurice Gross

정회기 조선대학교 외국문화연구소 1994 外國文化硏究 Vol.17 No.1

한국노동쟁의에 있어서 직권중재제도의 개선에 관한 연구

이회규 韓國仲裁學會 2006 중재연구 Vol.16 No.1

This article deals with the Improvement of Compulsory Arbitration System on Trade Union and Labor Relations Adjustment Act in Korea. If a labor dispute occcur, the settlement of labor dispute must be reached for the parties' own accord. The autonomy of the parties concerned is the fundamental principle in the settlement of labor dispute. If the Rights Which are guaranteed by art. 33 Constitutional Law belong to civil liberties, we should consider Trade Union Act as the restriction of basic rights. Arbitration is a procedure which permits the most positive intervention by the arbitrator. It is carried out by an arbitration committe which is composed of three arbitrators appointed by the chairman of the Labor Relations Commission. Compulsory arbitration system of the labor for parties should be improved. In case of necessary public enterprises, more strict requirements on assembly for labor disputes should be prepared and the government should support institutions to prevent labor-management disputes by educating experts on labor-management relations and improving the quality of arbitration.

종합건강진단을 통한 암발견 수진자의 특성 분석 연구 : A 병원 건강진단결과를 중심으로

김회창,정두채 남서울대학교보건의료개발연구소 2004 보건복지 연구 논집 Vol.1 No.1

This study aims to provide information about the management of cancer and to indicate importance of regular health check-up procedure for early detection of cancer. The study population composed of 829 cancer patients of the total 141,662 persons (male: 84,191 and female: 57,471) who received health check-up at a general hospital in Seoul during 4-year from January 1, 1999 to December 31, 2002. The major results of this study are as follows. First, among 141,662 persons who received the routine health check-up, 829 persons (0.59%) had cancerous cell growth. Male are 523(0.62%) and female are 306(0.53%) (P<0.031), that is, one person out of 171(male: 161 and female: 188) who received a regular health check-up was diagnosed as cancer patient. Second, the older of age and the lower level of education has the higher rate in detection of cancer. As to the frequency of consultation, the detection of cancer was higher at the first visit than subsequent visit (P<0.001). And as to the type of application for health check-up, the detection of cancerous growth was higher in individual application than group application (P<0.001). Third, in terms of the type of cancer, detection of stomach cancer was highest (295 out of 829 patients) and the lowest was biliary cancer (26 out of 82 patients) (P<0.001). When the progress of cancerous growth of 717 patients out of the total 829 patients admitted in A hospital was analyzed. The patients in the early stage was 66.5%(477 patients) while 33.5% (240 patients) was in the advanced stage (P<0.001). In addition, among 608 patients who had surgery 75% (456 patients) were at the early stage of cancer while 25% (152 patients) were in the advanced stage of cancer. This result demonstrates importance of general health check-up and early detection of any cancerous growth. In relation with life style of the patients, 35 patients of the 37 lung cancer patients had a smoking habit, reaffirming the strong relationship between smoking habit and lung cancer. In addition, 79.4% of gastroentestinal cancer patients had habit of drinking. The positive relationship between the characteristic variables of the patients whose cancer were found by health check-up process: between smoking and drinking, between drinking and level of education, between admittance to hospital and surgery, between surgery and age, and between status of cancer and surgery. As conclusion it is proved that the general health check-up is very useful in preventing, detecting and timely treatment of cancer.