LAN 환경하에서 효율적인 원격강의 시스템의 설계 및 구현

유종훈,이병수 순천향대학교 부설 산업기술연구소 1998 순천향 산업기술연구소논문집 Vol.4 No.2

In this thesis. we present a multimedia tele-lecturing system that supports a real-time bidirectional learing through the computer networks. The proposed system, which is a multimedia tele-lecturing system based on a model of real classroom, consists of the multimedia authoring tool, the BBS system and the remote lecture system. A instructor can build conveniently educational materials such as examination papers by using the authoring tool, Through the BBS, learners can communicate the questions and answers with their instructor. The remote lecture system provides an environment in which the instructor and learners can navigate the courseware prepared for the lecture. This ability can be carried out though the real-time video conferencing, the shared workspace and the monitoring tools. In this thesis, we fist analyze the functional requirements, and then describe the design specification and the implementation details of the system.

다수의 전이병소를 수반한 하악골의 중심성 점액표피양암종

유동수,박태원,최순철,이영호,소병천 大韓口腔顎顔面 放射線學會 1997 Imaging Science in Dentistry Vol.27 No.1

The authors diagnosed a 54-year-old male as central mucoepidermoid carcinoma after undergoing clinical, radiological and histopathological examinations. The characteristics were as followed: 1. Clinically, the patient complained of the painless unilateral swelling of the left mandibular molar region and had a pus discharge through the fistula. Painful nodule was palpated on the scalp of the left frontal area and it was regarded as a metastatic lesion. 2. Plain radiographs showed the ill-defined permeative radiolucent lesion. The osteolytic lesions were also detected in the cranial bone, number 9 and 11 ribs, scapula, and vertebral bodies. 3. The mandibular CT and PNS MRI showed the swelling of the left mandible and the enlargement of the several lymph nodes of 1.5 cm in size. 4. Histopathologically, many solid epidermoid type cells were mixed with mucus-secreting cells and they were arranged in duct-like structure. Most of them were epidermoid type, which indicates a high grade tumor. Mucins could be found in mucicarmine staining.

Oxy-acetylene welder의 안전장치에 관한 연구

유병철 군산대학교 1971 群山水産專門大學 硏究報告 Vol.5 No.1

A low pressure type oxyacetylene welder is equipped with a safty device. The purpose of this safty device is to prevent an explosion of the acetylene generator due to a possible back fire which could occur in the the course of welding. By installing a water gauge and a pressure gauge to the pressent safety device, an additional degree of safty is achieved. The result of a test pertaining to the relation between the weight of the floating cylinder and the pressure of the gas for the acetylene generator, between the pressure of the gas inside the hose suitable to a neutral flame for each tip number and the water level, and between the weight of the floating cylinder, the water level, and the pressure of the gas inside the hose is as follows : (1)The relation between the weight (x kg) of the floating cylinder for the acetylene generator and the pressure(Amm Aq.) of the gas : A ***** 20x-30 viz. x : 10∼20(kg) (2)The relationbetween the pressure(Hmm Aq.) of the gas inside the hose, the weight(x kg) of the floating cylinder, and the water level(W mm) : ***** (수식 p.27) (3)The weight of the floating cylinder convenient for the carring of the acetylene generator is 13 to 14kg. The water level of the safty device suitable to effective welding is 80 to 90mm.

박강판(薄鋼板)의 Gas용접에서 일어나는 용접단(溶接端)의 간격에 대한 고찰(Ⅲ) : 1.2mm강판의 Butt용접에 대하여

유병철 군산대학교 1976 群山水産專門大學 硏究報告 Vol.10 No.2

In making a gas welding of a light sheet-sheel, various deformations are taken place, and among them a few ways of a welding practice such as Backward, Symmetrical, and Jumping types have been utilized with a view to prevent the revolving strain. Hut these ways increase both the welding stress and the amount of work, and accordingly decrease the welding efficiency. Continued on the last study on the effective ways of a welding practice making a reverse use of the revolving strain by measuring the length of interval between the other ends of two sheets suitable to the butt welding of a light sheet-steel in thickeness of 1mm published in 1969, this thesis contains a study on the length of interval between the other ends of two sheets which have thickeness of 1.2mm. When we set 15cm/min at the weld speed, tip size 50 in a welding torch, the pressure of oxygen 2kg/㎠, and the diameter 3mm of a welding rod, the length of interval between the other ends of light sheets are shortened in 1mm when the thickeness of light sheet-steel is thickened in 1.2mm as a results of this experiment. And when we formularize these, the results are as follows; 1. 5cm to 15cm width sheets

PLL에서의 루프필터 특성에 관한 연구

유종훈,이병수 순천향대학교 부설 산업기술연구소 1998 순천향 산업기술연구소논문집 Vol.3 No.3

In this paper, a phase-locked loop(PLL) designed and simulated with todays general simulation, PSPICE PLL consists of a phase detector(PD), a voltage-controlled oscillator(VCO), and a low-pass filter(LPF). LPF out of them does a great deal of effect to the frequency characteristics of PLL. By using a RC LPF, a Butterworth, and a Chebyshev LPF in turn, the frequency characteristics of the outputs according to the variations of the inputs are analyzed respectively. When 2.5KHz is selected as specified free running frequencies in VOC block, the characteristics of the outputs show that in case of 3rd order Chebyshev LPF, the capture and lock range are 1076Hz and 2112Hz respectively. Besides, this paper shows some validity that this macromodeling technique is one of the easy and accurate methods in analyzing the frequency characteristics, and useful in simplifying the circuits.

危險調整割引率法과 確實性等價法에 관한 硏究

兪炳辰 명지대학교 1977 明大論文集 Vol.10 No.-

박강판(薄鋼板)의 Gas용접에서 일어나는 용접단(溶接端)의 간격에 관한 고찰 (I)

유병철 군산대학교 1969 群山水産專門大學 硏究報告 Vol.3 No.2

In making a welding of light sheet-steel, the strain has a variety when tacking is prooeeding it varies with the revolving strain which results in the deformation of the weld. A few ways of welding practice such as Backward, Symmetrical, and Jumping types have been used in order to prevent the revolving strain. But these are deficient in the course of welding because of being larger stress in both flat sheets and increasing amount of work. So there has been much illogicality through a low weld ability. This absorbed the author much interest. So here the broad measure of intervals between both the other ends of light sheets which have thickness of lmm has been examined to make a true weld operated. According to the same thickness, length, and width of metals to be weld the amount which is made a reverse use of revolving strain by making a suitable interval beforehand could be arranged and then the process could be done without any defortmation in spite of the strain acts. When we set at the weld speed 15cm/min., tip size 50, pressure of oxygen 2kg/㎠, and diameter of welding rod 3mm, the resutls are as flolows; 1.5cm to 15cm width Sheets ***** 2.15cm to 20cm width sheets ***** 3.20cm and over width sheets ***** I:Interval between the other ends of two sheets. (mm) W:Width of sheet. (cm) L:Length of sheet. (cm)

박강판(薄鋼板)의 Arc용접에서 일어나는 회전변형에 관한 고찰(Ⅰ) : 1.6mm 강판의 Butt 용접에 대하여

유병철 군산대학교 1977 群山水産專門大學 硏究報告 Vol.11 No.1

The revolving strain occurring in the oxy-acetylene welding of a light sheet-steel has various deformations according to the width and length of welding things, which I have already carried out 3 experiments with in 1969, 1970 and 1976. Now I would like to set forth the results of the experiment on what quantity of deformation the revolving strain, which is occurring in the arc-welding of a light sheet-steel in thickness 1.6mm, shows according to the width and length of a welding things To my additional remarks I carried out my experiment with welding electric current of 50 amperes, welding rod in diameter 2.6mm and welding speed of 50cm/min The results are as follows : 1)The direction of the revolving strain occurring in the butt welding of a light sheet-steel ·became narrower in the oxy-acetylene welding and wider in the arc-welding. 2)In the oxy-acetylene welding, when the welding thing is 5-20cm in width and 1mm in thickness, the interval between the other ends became narrower to 1.8-4.5% of the length of the welding thing. On the other hand, when it is 1.2mm in thickness, it did to 1.25-3.95% of the length But this experiment shows that it became wider to 0.00-1.37% of the length.

학생 자기평가를 적용한 교직과목 강의에 대한 자기연구

유병규 부산대학교 과학교육연구소 2013 교사교육연구 Vol.52 No.1

이 연구는 2012년 1학기에 강의한 한 교직과목에서 학습성찰일기라는 자기평가 방법을 활용한 나의 수업을 자기연구방법으로 탐구한 것이다. 자기평가 방법은 최근 전통적 평가에 대한 한계를 지적하면서 제기되고 있는 대안적 평가의 한 방법으로 학생 스스로가 자신의 학습 태도부터 과정, 결과까지 평가하는 방법을 말한다. 이러한 자기 평가 방법이 수업에서 어떤 의미를 가지고 있는지 교수자와 학생의 차원으로 분석하는 것이 이 연구의 목적이다. 이를 위해 2012학년도 1학기 본 연구자가 담당했던 교직과목을 대상으로 학습성찰일기라는 자기평가 방법을 활용한 수업을 자기연구방법으로 탐구하였다. 그 결과는 다음과 같다. 우선 교수자에게 자기평가는 첫째, 학생들과 소통하며 함께 만들어가는 수업의 과정이고, 둘째, 학생에 대한 정보제공자이며, 셋째, 가르치는 내용과 교수활동의 일치를 위한 과정이다. 또한 학생들에게 자기평가는 첫째,적극적인 학습태도로의 변화 과정이고, 둘째, 일종의 복습 과정이며, 셋째, 교사가 되면 활용할 미래의 교수전략의 의미를 가진다. This paper explores my teaching experience of instruction utilizing reflection journals as a self-assessment through self-study in Spring Semester in 2012. Self-assessment is an alternative assessment method resolving limitations of the traditional assessment method. Students themselves assess their learning attitudes, processes and results. The purpose of this study is to analyze what self-assessment means in a teaching profession course in light of teacher and students’ perspectives. As a teacher educator-researcher, I inquired my own instruction through self-study. The results are as follows: For teachers self-assessment offers lessons communicating with students, information providers about students, and agreement in both teaching contents and activities. For students, self-assessment provides active learning attitudes, review process, and future teaching strategies as pre-service teachers.

테니스 운동화 구매 시 중요평가기준 분석

유병인 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5

The purpose of this study was analyzing of purchasing with importance evaluation criteria and brand quality of tennis shoes in preference of amateur tennis club member. The subjects ware 220 women amateur member of participated in the whole country game. Data analyses were derived through the use of Statistical Package for the Social Sciences(SPSS 11.0), All data were analyzed by reliability analysis, factor analysis, frequency analysis. cross-tab analysis and one-way ANOVA, Post hoc used Scheffe method, The results of this study acquired through this procedures are as follows, Firstly, Results showed that tennis career, game result ware statistically different in relation to Purchasing with Importance Evaluation, Secondly, Results showed that number of exercise, game result were statistically different in relation to Importance Evaluation Criteria, Thirdly, Results showed that Purchasing with Importance Evaluation were statistically different in relation to Importance Evaluation Criteria.