A STUDY ON THE EXPLOSION SAFETY ASSESSMENT OF HYDROCARBON REFRIGERANT REFRIGERATOR

Oh,Kyu-Hyung,Kim,Min-Kyu,Chu,Euy-Sung,Lim,Byung-Han,Kim,Man-Hoe,Park,Yoon-Ser 한국화재소방학회 1997 한국화재소방학회 학술대회 논문집 Vol.1997 No.-

This paper discribes an experimental explosion risk assessment study on refrigerators containing flammable hydrocarbon refrigerant. A refrigerator used in this study is a larder fridge type, 215 liter in volume. The hydrocarbon refrigerant used in the refrigerator is iso-butane(C<TEX>$_4$</TEX>H<TEX>$_{10}$</TEX>). For the explosion safety assessment of the refrigerator, temperature of compressor, cooling air circulation fan motor, defrost heater and inner lamp were measured during the operation. And to confirm the ignitablity of flammable gas by the electric spark of the switches of the refrigerator, ON-OFF test of all switches were conducted with compulsorily near the stoichiometric concentration atmosphere of iso-butane-air mixture. As the result of experiment above mentioned and another experiment for the explosion safety assessment, we can conclude that explosion hazard in connection with the use of hydrocarbon refrigerant was few.w.

국가 대표급과 제주도 고교 대표급 수영선수들의 그랩 스타트의 운동학적 분석

김철원,김승곤,오만원,임상용,김성찬,이창준,남사웅,이세형,류재청,신석종,김세민 濟州大學敎 體育科學硏究所 1998 체육과학연구 Vol.4 No.-

The purpose of the study was to undertaken to analysis the Grab starting technique between national representive team(3) and Cheju's representive team(3) with 3D cinematography. The conclusions obtained were as follows: Cheju's showed more elapsed time than national representive team on starting block. and more vertical than horizontal direction of COG position, more concentrated vertical velocity & acceleration than forward direction. Therefore It is necessory for cheju's to train balanced trust force in horizontal and vertical direction in grab starting technique.

Influence of Bundle Diameter and Attachment Point on Kinematic Behavior in Double Bundle Anterior Cruciate Ligament Reconstruction Using Computational Model

Kwon, Oh Soo,Purevsuren, Tserenchimed,Kim, Kyungsoo,Park, Won Man,Kwon, Tae-Kyu,Kim, Yoon Hyuk Hindawi Publishing Corporation 2014 Computational and mathematical methods in medicine Vol.2014 No.-

<P>A protocol to choose the graft diameter attachment point of each bundle has not yet been determined since they are usually dependent on a surgeon's preference. Therefore, the influence of bundle diameters and attachment points on the kinematics of the knee joint needs to be quantitatively analyzed. A three-dimensional knee model was reconstructed with computed tomography images of a 26-year-old man. Based on the model, models of double bundle anterior cruciate ligament (ACL) reconstruction were developed. The anterior tibial translations for the anterior drawer test and the internal tibial rotation for the pivot shift test were investigated according to variation of bundle diameters and attachment points. For the model in this study, the knee kinematics after the double bundle ACL reconstruction were dependent on the attachment point and not much influenced by the bundle diameter although larger sized anterior-medial bundles provided increased stability in the knee joint. Therefore, in the clinical setting, the bundle attachment point needs to be considered prior to the bundle diameter, and the current selection method of graft diameters for both bundles appears justified.</P>

효율적인 네트워크 관리를 위한 사용자 인터페이스에 관한 연구

김만택,송권수,오병균 木浦大學校 情報産業硏究所 1995 情報産業硏究誌 Vol.3 No.-

Network management provides us with configuration management function, fault management function, performance management function, account management function, and security management function. A good Graphical User Interface(GUI) has been requested for users or network managers to monitor networking and to correct problems. In this thesisr, We design and implement GUI for a network management protocol used in the heterogeneous distributed environment. The designed GUI is developed by using Motif. Users easily select the managed object on the graphical map and execute commands through pulldown menus that are controlled by MWM. Our SNMP API provided access to MIB table to perform management operations, to set up the agent, and to include functions that return values of MIB.

골프스윙에서 볼의 비행거리에 미치는 요인분석 : 1번 드라이브를 중심으로 Focused on 1st driver

김철원,오만원,류재청 濟州大學敎 體育科學硏究所 1995 체육과학연구 Vol.1 No.-

The purpose of the study was to investigate factors influencing ball flight distance in 1st golf driving, and utilize the available training data investigated. The experimental method for the purpose was cinematography with 2 camera equipped front direction(#l camera) and rear direction(#2 camera) using air-ballon synchronization method. 1. physical fitness The characteristics of physical fitness was classified Zgroup, one(OMW, KJI) was superior power, muscular strength, normal blood pressure, the other(LHJ, LHJ) was not. 2. Temporal The elapsed total time from address to full followthrough in all subjects was mean 0.321 sec., 3 phases centering on impact was elapsed 0.132 ±O.OOsec(7.29%), 0.151 ±O.O32sec (7.87%), 0.183±0.057sec.(10.67%) in order of OMW, LHJ, KJI, KJH. The acceleration analysed was transferred with adequately suited timing to ball momentum obtained during downswing in OMW, decelerated centering impact the acceleration obtained during downswing, and the other 2 subjects was mid-level timing of the former 2subjects. 3. The horizontal displacement of COG was rear direction from address to backtopswing and front direction from topswing to followthrough. On considering COG displacement in rear or front, the most stable driving was in order OMW, KJH, KJI, LHJ. 4. The cocking range of foream-shift angle, topswing was in order OMW, KJI, KJH, LHJ, continuing followthrough was performed to ball flight direction on condition of uncocking from impact to followthrough in OMW, the others pulled instantly in just later impact. The shoulder-trunk mean angle was 136±3.94deg. in topswing, 18.65±3.10deg. in just before impact, 143.00±20.04deg. in followthrough considering the resulting, OMW showed the smaller degree, but the larger trunk twist to vertical axis while LHJ, KJH showed the contrast phenomenon. The trunk-thigh mean angle was 167.20±19.80deg., characteristics analysed divided into overextended(l86±2.16deg.) in OMW, overflexed(l41± 19.49deg) in LHJ and elbow flexion was mean 126.85±21.96deg, the range was in order of OMW, LHJ, KJI, KJH.in topswing and 64.60±10.87 deg in followthrough, the, elbow flexion range was the largest but the smallest in shaft-forearm incline in OMW while shaft-forearm incline was largest but largest flexion in LHJ. 5. Trunk Incline to vertical axis showed flexible followthrough in 25.20cm, 28.40cm of OMW, LHJ, but the others almost was not. 6. The rather high relation with muscular strength and Power factor showed rather high,and negative relation(r=-.92) with elbow flexion, with trunk incline(r=.84) in followthrough in correlation between ball flight distance and variables related with driving.

운동소질지수와 일반운동능력과의 상관관계 연구

김상철,오만원 濟州大學敎 體育科學硏究所 1999 체육과학연구 Vol.5 No.-

This study is aimed to supply basic data for sports leaders to apply to Physical Education when it comes to teaching. selecting athletes and making their improvement in skill by looking into the correlation between McCloy's Motor Quotient, which was measured through the general motor capacity test, and the Six Fitness Factors that were classified by Cureton. T.K. In the research, Three Hypotheses were set in relation to the aim. First, there might be a positive correlation between the Motor Quotient and the variable of General Motor Ability. Second. each variable of the General Motor Ability might distinguish the group of Motor Ability Quotient. Third. the measurement of General Motor Ability might vary depending on the level of Motor Quotient. For this study 130 students among 153 students in the second grade of D high school. which is located in Cheju Province. were selected as subjects. Potential subjects that were physically or mentally handicapped. organ patients or athletes were not included. First. in order to find out the Motor Quotient. McCloy's General Motor Capacity Test was performed and the Classification. Sargent Jump. Iowa Brace Test. and Burpee tests were taken to measure the quotient. Second, for each factor of the 6 Fitness Factors such as muscular power, power. flexibility, balance, agility, and endurance, which were classified by Cureton. T.K . two sports activities were employed to measure the ability. In order to yield the results of measurement. Micro Software's SPSS win (ver7.5) was used. To make clear the correlation between the Motor Quotient and General Motor Ability. M(mean), SD (standard deviation), R(correlation) among the factors of General Motor Ability were evaluated. Stepwise multiple regression analysis was applied to examine the most suitable factors of Motor Quotient. One-way ANOVA analysis was applied to analyze difference measurement among Motor Quotient. And then Scheffe's test was used as post-verification. The conclusions based on these procedures and materials are as follows: 1. There is a positive correlation between the variables of Motor Quotient and General Motor Ability. The measurement of the activities for the test of General Motor Ability showed positive correlation in distance, frequency. weight. and time. 2 .The variables of General Motor Ability distinguish the Motor Quotient Group. Among the 14 General Motor Ability variables. standing broad jump's predictability was highest (54.6%). then back strength (8.8%). Sargent jump (3.5%). and closed-eyes foot balance (1.5%). 3. Depending on the level of Motor Quotient , there is a meaningful difference in General Motor Ability. Among 14 General Motor Ability variables. the result of the dispersed analysis in standing broad jump turned out statistically significant. In order to find out the specific difference between the groups. the Scheffe post-verification was used and the mid MQ group jumped well in standing broad jump than the low and mid MQ group. It revealed that 10 out of 14 general motor ability variables revealed that general ability is related to the motor quotient.

제주 우수 육상경기 선수들의 년중 훈련효과 분석 및 처방

김철원,임상용,김승곤,오만원,김성찬,이창준,남사웅,이세형,류재청 濟州大學敎 體育科學硏究所 1996 체육과학연구 Vol.2 No.-

The study was undertaken to analysis, evaluate, and prescribe t h e annual effect of training of periodically anaerobic and aerobic motor ability for Che-Ju representive team of elementary, middle and high school athletes. first. the performance can be obtained when it was prescribed proper training after analysis of physical fitness by each events. second, individually fitness. scientific analysis. prescription. proper management of athlete will be necessary to apply. In addition to physiology aspect, it is essential to consider sport biomechanics. sport psychology when we prescribe specific events and necessary approach in demension coach-athlete-researcher for individual.

油壓 시스템에서 液柱分難를 수반하는 流體 過渡現象의 解析에 關한 硏究

金鍾謙,廉萬午 慶南大學校 附設 工業技術硏究所 1988 硏究論文集 Vol.6 No.-

유압시스템에서 관로내 액주분리를 수반하는 유체과도현상을 고속 고정도로 계산할 수 있는 방법을 제안하고 그 유용성을 검정하기 위하여 실험을 행한다. 종래의 방법 및 본 연구에서 제안하는 계산법으로부터 얻어진 계산결과와 실험결과를 비교검토한다. In fluid power system, due to rapid closure of valve on the pipeline oil column separation may occur. The cavity made during oil column separation results in high pressure pulse when it collapses and this phenomenon often causes pipe to fracture, vibration and noise. So the prediction of the pressure pulse is very important in the industry. So far, fluid transients problems accompanying column separation have been researched mainly under condition of steady turbulent state. However, the flow in the pipe of the fluid power system is mostly laminar state. Zielke derived unsteady laminar friction loss equation, but solving it with computer takes much CPU time. In this study, using Kagawa's method which takes less CPU time than Zielke's, a new method is introdused to analyze oil column separation. For the validity of the new method, experiment was followed.

골프장 이용 실태와 만족도에 관한 연구 : 98 전국체전 골프경기 참가선수를 대상으로

오만원,김용 濟州大學敎 體育科學硏究所 1998 체육과학연구 Vol.4 No.-

The purpose of this study is to find out the way of fostering golf activities with the public sports and to cultivate golf players by taking good advantage of this basic data which was obtained by surveying the golf players participating in the 79th national sport game on the reason they play golf and on the way to give the satisfactory environmental conditions to the golfers in using golf course. To achieve the aim of this survey, the questionaries whose main target was the golf players taking part in the national sport game was made in order to collect the data. The data analysis was performed by using the frequency and the variable analysis with the statistic methods. The result is as follows. First. the majority of the golf players participating in the 79th national sports game were those who finished undergraduate school and was at the age of bellow 25 and their family's earnings was over 2.5 million won a month. Second, the players mostly. in the aspect of the golf player's personal characteristic, had more than 5 year's experience in golf and practiced over 2 hours daily and had 2 or 3 rounds in a week. Also, they preferred middle and high level in the degree of difficulty of the golf course and their handicaps were lower than 3. Third. the purposes of their using golf course were different in connection with their age and the same in relation to their incomes. The players over 26 years old had positive thoughts in terms of playing golf for their health, relationship with others. and business, but the players under 25 were opposite. On the other hand, the players under 25 gave affirmative answer in playing golf to become professionals, but over 26 were opposite. Two groups had negative ideas in playing to get rid of stress. Forth, the golf players responded that the degree of their satisfactory was in good order as service > the course> condition> facilities> reservation > charges, and that of their dissatisfactory was in following order as service < reservation < the course condition < facilities < charges.

선삭시 6-4황동의 버어 생성에 관한 연구

김원일,염만오,이상복 慶南大學校 附設 工業技術硏究所 1998 硏究論文集 Vol.15 No.2

기계공업의 급속한 발달로 생산기술의 자동화, 고속화, 고능율화로 진보되어가고 있으나 아직도 생산현장에서는 버어의 제거작업은 수 작업에 의존하고 있다. 여기에서는 절삭작업시 생성되는 버어를 최소화하기 위하여 무단변속 선반에서 6-4 황동과 알루미늄 소재를 초경합금 절삭공구로 절삭하여 다양한 절삭조건에 따른 버어의 크기와 생성되는 형상을 검토한 결과, 절삭속도가 증가할수록, 절삭깊이가 작을수록, 이송량이 작을수록, 또, 알루미늄 소재보다는 6-4황동이 버어의 길이와 두께가 작게 생성되었고, 이송량이 작고 절삭속도와 측면 절삭날각이 클 때 버어의 생성이 작게 나타나는 현상을 보였다. We have made a cutting experiment using non-ceasing variance-speed cutting machine under the dimensional cutting condition. Material was 6-4 Bress and garbide alloy cutting tools was used. From the experiment , following results can be found about the formation and scale of the burr. 1. According to the increase of cutting speed. Burr length had a decreasing tendency, but burr thickness tend to increase in a little amount. 2. According to the dencrease of cutting depth, burr length tend to dencrease, but burr thickness, compared with the length, tend to decrease slowly. 3. With virial of cutting Materials, burr length and depth is shorter 6-4Brass cutting than Al cutting. Al > Brass 4. If less feed, burr produced the less amount of product in condition of large side cutting edge angle. 5. On the condition of little the feed, high cutting speed and wide side cutting edge angle, burr formed less product