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디스크 질량 변화에 따른 철도차량용 제동디스크의 마찰 특성
정종록(Jong Rok Jung),고은성(Eun Sung Ko),이희성(Hi Sung Lee) 한국트라이볼로지학회 2014 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.30 No.4
Low alloy heat resistant brake disk and sintered brake pad are applied to mechanical brake system for the speed-up of urban rapid transit. In this research, we analyzed how the frictional characteristics between brake disk and pad are influenced by the disk mass. At a high disk mass, the friction stability was the lower value as a result of the lack of tribofilm formation at the disk surface. Wear rates of friction materials showed the higher value at a low disk mass and wear rates of 10 mm and 15 mm showed the similar level. Average friction coefficient was the lower value at the 10 mm disk thickness and range of variation of average friction coefficient was also the smaller value at the 10 mm disk thickness. However, there were no significant changes in the friction coefficients under any of test conditions. Surface roughness of a disk showed the highest value at the 5 mm disk and surface roughnesses of 10 mm and 15 mm showed the similar level. As a result, friction characteristics of disk mass influenced the friction stability, as well as the wear rate of friction pad and disk, but not the friction coefficient.
한경수,정종록,서경미 한국외식경영학회 2005 외식경영연구 Vol.8 No.2
The purpose of this study was to evaluate Korean ginseng and consider ways to improve its flavor, its packaging, and its application. The study began with interviews of 23 professional restaurateurs, each with over 10 years of experience in hotels or family restaurants. They were handed questionnaires divided into two sections. One section had panelists evaluate the taste, smell, look, and consistency of Korean ginseng while the other section asked the panelists to suggest methods to develop and improve the product. Results of the survey suggest that Korean ginseng is best served in a liquid form consisting of about 10 per cent ginseng mixed with another flavored liquid. A plastic tube was found to be the most suitable container for the ginseng. Ginseng’s application could be expanded to include use in salad dressings and marinates. The results of the sensory survey showed an overall satisfaction rating of 3.36 with color, transparency, density, viscosity, odor and taste registering satisfaction ratings of 3.52, 3.52, 3.56, 3.16, 3.44 and 3.42 respectively. Taste tests of the Korean ginseng gave the sweet flavored ginseng a 3.24 satisfaction rating, while the salty taste had a rating of 3.36. Bitter ginseng had a satisfaction rating of 3.20, sour had 3.04, and the after taste had a rating of 2.64.
임성운,정종록 順天大學校 師範大學 附屬 科學敎育硏究所 1998 科學과 敎育 Vol.6 No.-
This paper is to investigate the interrelation between the point of view and the narrator, and the method in which it must be sought. The interrelation must be studied from the aspect of all things that novels are structures of language. Like all the other narrative fictions, the point of view is communicated by being uttered from the narrators. Though the point of view does not have the verbal aspect itself, but must be disclosed in the form of language. However we can't say that the point of view is subordinate to the narration by the narrator. Because despite the narrator handles the language, it is the point of view that gives conglomeration and hues to the language. The writers treated the point of view and the narrator with a typological method. The characteristic results are the following. First, the points of view in the 1-st person novels are divided into the 1-st person internal focalization and the 1-st person external focalization according to the sameness of the focalizer and the focalized. Second, according to their roles in histoire, narrators are divided into the 1-st person key-charactered narrator and the 1-st person sub-charactered narrator. Third, the points of view in the 3-rd person novels are divided into the 3-rd person external focalization and the 3-rd person internal focalization according to the identity of the focalizer and the focalized. Fourth, according to the degree of intervention in histoire, narrators are typically divided into the 3-rd person critical narrator and the 3-rd person neutral narrator. The significance of the typological studies like this lies in clarifying what aesthetic effects shows each type concretely in real works.
단일 그레인을 갖는 추진기관 그레인의 연소표면적 산출기법 연구
강경훈(Kyoung-Hoon, Kang),이준호(Junho Lee),송신영(Sin-Yeong Song),정종록(Jonrok Chung) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
본 연구에서는 추진기관의 내탄도 성능을 이론적으로 예측하는 방법 중 가장 중요한 정확도를 가늠하는 그레인 형상 및 시간변화에 따른 연소표면적 및 변화량을 산출하는 알고리즘을 구성하였으며, 구현된 프로그램에 의해 계산된 값을 모델링 프로그램에서 산출된 값과 비교하여 신뢰성을 확인하였다. 알고리즘의 기본 개념은 추진제 그레인 형상을 단면방향과 길이방향으로 요소화하여 각 요소가 시간증분에 따라 좌표 이동하여 연소현상을 표현하였으며, 이렇게 구현된 프로그램은 내탄도 해석에 활용할 수 있는 충분한 가능성을 확인하였다. In this study, we have constructed this algorithm that theoretical method for prediction performance of the internal ballastic analysis. And we have confirmed reliability, compared the value calculated by realized program with the value computed by modeling program. A basic concept of algorithm expresses combustion phenomenon to move each factor(node) according to the time increment like as Finite element method. And we have confirmed this realized program has sufficient possibility to utilize in the internal ballastic analysis.