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.

구강작열감 증후군(BMS)의 문헌고찰과 증례보고

임희순 광주보건대학 2003 論文集 Vol.28 No.-

Burning mouth syndrome (BMS) is an intraoral pain disorder that is uncompanied by clinical signs and characterized by a burning sensation or stinging of the mucosa, lips, and/or tongue, in the absence of visible mucosal lesion. There has been no established theories about the diagnosis and treatment. The burning mouth syndrome is troublesome condition for both the patients and the dentist. In my opinion, as it converts our society into being senile, because of increasement in quantity of BMS patients. The causes of BMS are multifactorical and remain poorly understood. For the BMS patients, before imperishable impair to the tooth (ex: Tooth Extraction, Endodontic treatment) after investigating feasible cause, execute medical care. This report describes six cases of burning mouth syndrome patients who high treatment response. The clinician must recognize that burning mouth syndrome is a mulifactorical disease process in which numerous possible etiologies must be eliminated before the proper treatment can initiated. The purpose of this article is to examine the clinical feature of BMS patients and to present a treatment protocol that can be helpful in clinical applications.

Photoluminescence과 Conductance 측정을 이용한 자외선 조사된 Ge첨가 다성분계 산화물 유리의 구조변화 관찰

이회관,오영석,강원호 단국대학교 2001 산업기술연구 Vol.2 No.-

Ge-doped multicomponent oxide glasses were prepared by a conventional melting method. The structural change around Ge ions was investigated by using PL(photoluminescence) and conductance(G). After UV irrdiation, the PL intensity decreased and the change were maintained at room temperature, but a photodarkened glass recovered near its original properties when it was heat-treated at 500℃ for several hours. The conductance of the irradiated sample decreased because the disorder in structure was happened by UV irradiation. These results can be explained a structural change were occurred at bonding structure between Ge ions and glass components.

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.

소형 로봇의 연속경로 추종제어

정회범 順天大學校 1994 論文集 Vol.13 No.1

□Magnitude of control inputs for small motors used in robot is generally restricted to low level due to actuator saturation. This paper compares the tracking performance of the bounded-gain adaptive control algorithm with the existing PD control algorithm by computer simulation and experiment. The reference trajectories are obtained using the kinematic model of Rhino XR-2 robot. The robot controller is designed and fabricated for the implementation of the control algorithms. It is shown that the bounded- gain adaptive control algorithm yields better tracking performance and smoother input variation than the PD control algorithm in the two-axis robot control.

비정질/다결정 실리콘 Gate를 이용한 Gate 산화막 특성 개선

정회환,정관수 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-

The polysilicon films were deposited in a LPCVD furnace on oxidized substrates at temperatures above 620℃. The polysilicon gates were doped by a LPCVD furnace with POCl_(3) as the dopant gas. Dopant diffusion through the gate can lead to a degradation of the electrical properties. The interface properties have been characterized SIMS, ASR analysis. We have studied the breakdown properties of MOS fabricatied by depositing polysilicon on very thin(200Å) gate oxides grown by wet oxidation in a conventional furnace. The amorphous/poly silicon gates have higher breakdown field than the polysilicon gates.

중국 광고언어에 대한 수사학적 고찰과 교육적 활용에 관한 연구

문회선 이화여자대학교 교육대학원 2002 이화교육논총 Vol.12 No.-

A study on the Chinese advertising description is a very interesting field, but few formal studies were made on the subject. Moreover it is a realistic material from which one can learn live Chinese, it hasn't been reviewed from a educational point of view yet. In this aspect, the author analyzed Chinese advertising description from a rhetorical angle and presented the methods of utilizing it in Chinese Education. Advertising uses rhetorical devices to persuade consumers to purchase products or services. So to grasp the meaning of it accurately, we need to analyze it in the rhetorical point of view focusing on rhetorical characteristics such as hyperbole and repetition. In chapter Ⅲ, the author approached to the study of rhetorical devices used in Chinese advertisements from classification of rhetoric into the morphologic aspect and the semantic aspect. From the analysis on the morphologic rhetoric used mainly in modern Chinese advertising description, one can see that there are parallelism, enumeration, repetition, anadiplosis, palindromes, ellipsis, and rhetorical question. From the analysis on the semantic rhetoric used mainly in modern Chinese advertising description, one also can see that there are comparison, personification, hyperbole, irony and paradox, contrast, and pun. Advertising description employing various kinds of rhetorical devices plants much more strong impression in Chinese consumers' mind than general expression. In chapter Ⅳ, the author mentioned that advertising description is very valuable as Chinese educational material and suggested the specific ways of utilizing it. The author suggested practical methods of utilizing it-to translate the advertising description, to practice words used in advertisements, to grasp rhetorical characteristics, and to catch Chinese society and culture-based on the concept that the proper use of the advertising description which is available educationally has positive influence on the study of foreign language.

과학 문제해결 과정을 활용한 초등 과학 수행평가 도구의 개발과 적용

최회정,임채성,김은진 부산교육대학교 과학교육연구소 2003 科學敎育硏究 Vol.28 No.-

In this study, the performance assessment tools using processes of solving problems in science were developed and applied to instruction, then their effects were analyzed both quantitatively and qualitatively. The results of the research can be summarized as follows: First, among the performance assessment tools developed in the study, the students' response formats were shown to be a useful method to understand collectively the processes and products of learning, and the students' appreciation toward it was also found to be positive. Second, in science instruction which proceeded through each step of science problem solving the science attitudes of the experimental group, although not statistically significant, showed more improvement than comparison one. Among the categories of science attitudes, 'attitudes toward science subject and the unit or topic studied' showed statistically significant improvement, which is interpreted as results of making harmony of preexisting students' interests with difficulty levels of tasks. Third, for overall several science process skills, there were no significant improvement. However, the subskills of inferring, data interpretation, and drawing conclusion were found to be increased significantly, which might be due to the frequency and depth of use of these skills in real instruction. Fourth, for aspect of the understanding of science knowledge and applying of it, there were statistically significant increase. That is, it was interpreted, through active participation in learning task across the whole range of performance of problem solving, that the abilities to applying science knowledge to the given problems were significantly increased.

수종의 구강위생 방법에 따른 인공 초기 우식법랑질의 재석회화에 관한 비교 생체연구

정회민,김용기 단국대학교 치의학연구소 1991 논문집 Vol.3 No.-

With a view to evaluating the effect of topical fluoride application in vivo, enamel slabs taken from artificial carious lesion produced by Hydroxyethylcellulose system were mounted in acrylic mandibular removalbe 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 times 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 polarizing light microscope, artificial carious lesions 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 decreased lesion depth with increased thickness of intact surface. This features were more distinct in the case of topical fluoride application groups(group 2, 3, 4). The body of remineralized lesion in group 1, 2 revealed continuous pattern, whereas group 3 and 4 showed interrupted charicter. 3. From Ca & P profile analyzed by WDX, maximum mineral loss of most lesions was shown to be detected at around the area of 80㎛ from surface roughly. The intergroup rank of remineralizing rate based on WDX data in descending order was group 4, 3, 2 and 1.

離婚給付에 관한 硏究 : 財産分割請求權과 離婚慰藉料請求權을 중심으로

李會圭 강남대학교 사회과학연구소 2000 사회과학논총 Vol.9 No.-

지난 수 십년 사이에 家族法은 크나큰 변화를 맞이하였다.離婚給付에 관한 제도 역시 많은 발전이 있었다.오랫동안 離婚慰藉料請求가 離婚給付로서의 중요한 역할을 수행하여 왔지만, 1990년 이후부터는 財産分割請求權制度가 신설됨으로 그 역할을 대체하고 있다.이러한 변화는 婚姻法의 근간이 有責主義에서 無策主義로 전환하고 있으며, 離婚以後의 諸般 法律問題 역시 이러한 분위기에 편성을 하고 있기 때문이다.그러나 실무계의 분위기에 의하면 아직까지 많은 이혼당사자들이 계속하여 離婚慰藉料請求制度에 관심을 두고 있다고 한다.이는 財産分割請求制度가 離婚給付로서의 역할을 제대로 수행하고 있지 못고 있음을 의미한다.이러한 관점에서 本 論文은 이혼위자료청구 및 재산분할청구제도의 본질과 그 성질을 살펴보았으며, 兩請求權을 행사함에 있어서 야기되는 제반 問題點을 구체적으로 구명하였다. 또한 兩制度의 相互關係와 실무계의 입장을 다양한 견해를 바탕으로 정리하였다.특히 본 논문은 財産分割請求權制度가 실무계에서 어떻게 적용되고 있으며, 어떠한 문제점이 야기되고 있는지에 초점을 두고 있다.