鐵道車輛 Disel Engine의 排出 Gas 現況및 低減方案에 관한 硏究

송문석 철도전문대학교 1997 論文集 Vol.13 No.1

Disk 溫度 및 走行速度 變化에 따른 制動 特性에 관한 硏究

宋文錫 철도전문대학교 1992 論文集 Vol.9 No.1

This pauper consists of five chapter, which can be summarized as follows. Chapter I comprises the object, the necessity and the content of this study as a preface. Several urgent problems motivate this study of brake system. As we know, most trains which are running these days are equipped with disk brake system and maximum. Therefore It is high time that the importance of brake system should be emphasized and studied. This study aims at investigating many effects on braking : Disk and lining represent different braking Characteristics under various conditions in braking ; Disk and lining vary friction coefficient and temperature in relation to changing temperature and speed, which cause the variation of brake distance. And it should be noted how friction coefficient and humidity in the atmosphere affect braking. Chapter II ILLUSTRATES THE METHOD AND APPARATUS USED IN EXPERIMENT, tHE TESTED USED IN EXPEDIENT IS THE SAME TESTED AS k.n.r HAS, AND IS MADE UNDER SAME CONDITIONS COMPARED WITH TRAINS DUNNING RECENTLY. Chapter III shows characteristics and conditions of brake lining, which must produce constant braking power by constant friction coefficient without damaging brake disk friction surface. Chapter IV is composed of three paragraphs, which represents the effects and careful study of experiment acquired by brake tester. Chapter V is mainly made of the most important conclusions in this study. By studying braking characteristics relating disk temperature and running speed variation, the following important conclusions are constructed as to brake tested. 1. The value made by expedient at the time when dunning speed and disk temperature in early stage of braking are constant, is applied to TORQUE and I.F.C by minimum square method and experiment formula is diagrammed and each value can be obtained. 2. After junction braking, to repeat braking under the ascending temperature of disk causes the prolongation of brake distance and the delay of brake time because of the reduction of I.F.C. So, while operating train, it is desirable to avoid repeating sudden braking. 3. It is generally thought that high humidity in the atmosphere bring about the descent of frictioncoefficient when braking, but I,F.C seldom changes according to the variation of humidity. 4. It is predictable that the lining on a large scale can produce the prolongation of brake distance and the delay of brake time because of the reduction of I.F.C. 5. Lining has peculiar characteristics, physical and chemical, which accompany the reduction of friction coefficient, the prolongation of brake distance, and the delay of brake time.

제동 마찰재에 미치는 압부력변화와 마찰특성에 관한 실험적 연구

송문석,최경진 철도전문대학교 1996 論文集 Vol.12 No.1

Examined in this paper is effect of frictional characteristics by change of braking lining force. For the specimens 1.38, 1.6, 1.8ton of braking lining force is tested organic and sintered pad. Dynamo tester was used to measure the friction coefficient and lining temperatures wear rate with respect to the braking lining force. In result, mean friction temperature, wear rate with respect to the braking force. In result, mean fraction coefficient and disk temperature etc. is depended on braking lining force. Particularly, the temperature characteristics of friction material is well shown by change of the brake pressure.

한국체류 외국인 유학생의 공공외교 강화전략 연구

송문석,황기식 사단법인 한국민족연구원 2020 민족연구 Vol.0 No.75

This paper confirms the strategic value of foreign students from the perspective of public diplomacy and suggests strategies for strengthening public diplomacy of the government and universities. The age of 200,000 foreign students is ahead. However, despite the fact that foreign students are an important strategic asset in public diplomacy, domestic research on them is less active than in foreign countries. The government also focuses on quantitatively attracting foreign students, and universities tend to recognize it as a poor fiscal balance. As a result, foreign students' attitude toward Korea gradually decreases with time, and they return to their home countries with higher anti-establishment. Criticisms are raised that foreign student attraction is fostering anti-Korean and anti-Koreans, not pro-Koreans. Therefore, from the perspective of public diplomacy, it is essential to study the trends of foreign students' cultural adaptation and their preference for their country of residence. Therefore, this study examines the attitudes of foreign students staying in Korea and suggests countermeasures based on trends in their attractiveness, using the “U-curve theory” established as a theory of foreign students' cultural adaptation and attitude toward the country of residence. 본 논문은 외국인 유학생의 공공외교 관점에서의 전략적 가치를 확인하고, 이에대한 정부 및 대학의 공공외교 강화전략을 제시한다. 한국은 외국인 유학생 20만명 시대를 앞두고 있다. 그러나 유학생이 공공외교의 중요한 전략적 자산임에도불구하고 이에 대한 국내의 연구는 활발하지 않다. 정부는 유학생의 양적 유치에정책의 주안점을 두고 있으며, 대학은 재정수지 개선 수단으로 유학생을 인식하는경향이 강하다. 이로 인해 유학생들은 한국에 대한 호감도가 시간이 갈수록 점차낮아지게 되며 반한정서가 높은 상태에서 귀국하게 된다. 유학생 유치가 친한파가아닌 반한파와 혐한파를 양성하고 있다는 비판이 제기되는 상황이다. 따라서 공공외교 관점에서 볼 때 유학생의 문화적응과 체류국가에 대한 호감도 변화 추이에대한 연구는 필수적이다. 이에 본 연구는 유학생의 문화적응과 체류국가에 대한태도 변화를 실증한 ‘U-curve 이론’을 이용해 한국에 체류 중인 유학생의 태도를점검하고 호감도 변화 추이에 따른 정부와 대학의 대응전략을 제시한다.

철도차량 윤중편차 변화에 따른 주행안전성 특성 검토 연구

송문석,김철수,이승일 한국도시철도학회 2017 한국도시철도학회논문집 Vol.5 No.4

Trains running on the track at the prescribed speed are generally safe, but they are evaluated quantitatively by the safety of derailment of the train (lateral force/vertical force, wheel unload ratio). This quantitative evaluation can cause several problems. This is because the derailment safety standard that can express the risk of derailment as an index is not yet established in Korea as a standard or standard. Also, the relation between the change in the radius of curvature and the vehicle derailment is not clearly known. In this study, the influence of deviation on derailment safety is analyzed through numerical analysis to secure the running safety of trains. As a result, the variation rate of the decrease rate of the wheel load ratio is increased sensitively, but the estimated derailment coefficient is almost constant as the passing speed is faster in the wheel load ratio of the outer based on the variation of the curve passing speed. The effect of the change in the ratio of the stopping torque on the outboard wheel to the estimated derailment coefficient at a slightly larger radius of curvature based on the change of the curve radius is small, The value of the estimated derailment coefficient increases sensitively. In addition, the change wheel unload ratio due to the increase of the static wheel load ratio of the outer wheel was sensitively increased at a given radius of curvature. In this way, it can be confirmed that the static wheel load ratio, that is the wheel load deviation, adversely affects the safety of the running of the vehicle.

대륙철도로 가기위한 우리의 기초적 준비사항

송문석 한국철도학회 2009 철도저널 Vol.12 No.2

철도차량의 승강장 통과시 발생하는 공기역학적 영향에 대한 실험적 연구

송문석,김문헌,김동현,권혁빈,김도훈 대한기계학회 2004 大韓機械學會論文集B Vol.28 No.6

철도차량용 제동 마찰재의 마찰 특성에 관한 연구 ( A Study on Friction Characteristic of Braking Friction Materials for Rolling Stock )

송문석,권성태,권석진,김기열 대한기계학회 1995 대한기계학회 춘추학술대회 Vol.- No.-

경부 고속철도차량 냉방시스템의 구조적 이해

송문석,김장희 대한설비공학회 2000 설비저널 Vol.29 No.10

大學 敎養體育 活性化 方案

宋文錫 조선대학교 교육연구소 1993 교과교육연구 Vol.15 No.-

University programs for activating physical education as a cultural subject. University intend to provide the students with the foundation of life-long physical training, To get the overall view of this, the researcher made a questionnaire. Professors in 83 universities took part in the quiz. The research was made on the basis of the gathered questionnaires. The main items to analyze were as follows: 1. Semesters to complete & credits to take 2. Evaluating method 3. Physical training facileties 4. Practical sport items & trainee members The result was follows: 1. In 56 universities out of 83 universities(68%), physical education was a required subject. In 53 universities out of 83 universities(64%), students are supposed to complete to semesters. 2. Students' achievement was evaluated from both practical skills and theoretical knowledge. In 42 percent of universities, evaluation ratio was that practical skills formed 70 percent and theoretical knowledge did 30 percent. This was the most widely used ratio. 3. In 59 percent of universities, they thought sport facilities was insufficient. In the case of the newly established colleges, it was all the more insufficient. 4. The order of pularity in practical sport items was a ball game, bowling, swimming. Trainee numbers average 40∼60 personals a class in national universities and 40∼80 in private universities. Considering that the proper number to get educational effectiveness was 40∼50 personals a class, it was approaching the approximate number.