리포좀의 안정성 향상에 관한 연구

신광호,송환 한국기술교육대학교 2000 論文集 Vol.7 No.1

ABSTRACT For ascorbic acid, an anti-aging agent as the functional substance, is easily oxidized, this was encapsulated by liposome with natural concentrated tocoperol to constrain the oxidation. This study was investigated to compare liposome's stability according to the type of lecithin and to examine the effect of cholesterol concentration, which strengthen the membrane of liposome, on stabilities of liposome and encapsulated substance. After preparing paste from lecithin, liposome was treated by the first and secondary liposome making method. It was more effective in stability of liposome to add cholesterol as membrane strengthened agent in preparing the secondary liposome. The result of study displays that the proper additional amount of cholesterol concentration is about 0.3∼0.6%. The use of natural concentrate tocopherol as antioxidatant was effective. The stability of liposome and encapsulated substance was more effective at 4℃ than at 40℃ in keeping temperature.

광 디스크 드라이버를 위한 대물렌즈의 중립 위치 제어

진경복 한국기술교육대학교 2003 論文集 Vol.10 No.1

Optical axis misalignment, which represents the position deviation of the objective lens from the optical axis, is an inevitable assembling error in an optical pick-up. Since the laser power intensity varies with the distance from the optical axis, the misalignment leads to variation of the laser spot power intensity, which is one of the critical factors increasing data bit-error-rate in optical disc drives. In this paper, an auto-adjustment scheme for optical axis alignment is proposed to eliminate the undesirable variation of the laser spot power intensity in optical disc drives. An envelope of the data signal is extracted and utilized to detect the optical axis misalignment. Then an adjustment input is added to the driving input of the tracking actuator to shift the objective lens to the optical axis. Finally, the feasibility is verified by a series of experiments.

전국 고등학교 교사 테니스대회 인구통계학적 분석과 만족도

김재우 한국기술교육대학교 2002 論文集 Vol.9 No.1

The purpose of this research was to investigate the relationship between the satisfaction and some variables of subjects who participated at the tennis tournament for the high school teachers. 136 teachers got received a survey with the method of self-evaluation that was a scale developed by Parrasuramaqn, Zeithaml, and berry(1994). All data were analyzed by SPSS 10.0, and the significance level was p<.05. The result was as follows: 1. Relationship between participators' general traits and participation at the contest. The result showed that they favored mostly the participation for the tournament if their average incomes per month were 2 -3 million won, their ages in the forties, the frequency excercise per week three times at least, or its experience above 10 years. the most subjects got the information of the tournament from professors who called directly. 2. The satisfaction for the equipment. The subjects were highly satisfied with the souvenirs, tennis courts, transportation, and other services. 3. The satisfaction for the service They wear very satisfied with the guide for the contest and the prize for the winners. Their opinions for the opening ceremony, the held season, the participating fee, and the schedule of the tournament, however, were neither satisfying nor dissatisfying. the result showed that the subjects were satisfied with the food and beverage a little.

자동화 생산기술에서 자기학습 및 창의적 문제해결 촉진을 위한 통합적 학습방안 연구

김준수 한국기술교육대학교 2002 論文集 Vol.9 No.1

Since a pretty long years ago all of machines and equipments are connected and controlled in one automatized production system, the electricians in the production field should understand the interaction among the electrical and mechanical components of the production process, and also be able to recognize the small change and the results in the whole system. The technical subjects should be then integrated with the working process in the same production field for the training students. It must be also trained so that the students might be able to analyse the technical problems in the economical and ecological perspectives. They are often confronted with the new situations, in which they should collect the related practical and technical informations and try to reconstruct their knowledge for creative problem-solving in the confronted situations. The students should be also trained so that they might be able to objectively collect and arrange the information in the appropriative knowledge-structuring system for problem-solving. It is studied here on the structuring of learning contents for the practice-oriented electrical training in the field of automatized production, in which the student could learned the knowledge-structuring method for the new problem-solving. These learning steps are made up with the following learning process; analysis of the confronted situation and recognition of the problem, knowledge coding for knowledge-structuring, setting-up the strategy for knowledge-structuring, idea finding, application and verification, reporting and evaluation.

Volcano Antenna 설계에 관한 연구

이직렬 한국기술교육대학교 2002 論文集 Vol.9 No.1

As it is well known, TEM horns are antennas that can achieve wideband characteristics over multiple decades. This special characteristic of these antennas makes antenna designers attaractive for designing an ultra-wide-band antenna. An ultra-wide-band antenna based on a coaxial feed structure, an axial symmetry aperture and a volcano configuration was designed and manufactured and its properties were analyzed and measured. The design was based on the graphical field mapping using a curvilinear rectangular fitting. Simulation and measured data showed its ultra-wide-band features, a low voltage standing-wave ratio over a bandwidth ratio greater than 30:1.

조정에 관한 연구를 위한 실험 환경 설계

김은경 한국기술교육대학교 2003 論文集 Vol.10 No.1

In building Intelligent Agent Societies(IASs), it is important to design and implement coordination in accordance with the known requirements and anticipated working conditions of the IAS in question. Coordination has been defined as the process of managing dependencies between activities in an IAS. Unfortunately, currently there is little theoretical support that could help in this process. Therefore, our final goal is to generate a empirically-based theory of coordination. In order to get basic data for constructing a theory of coordination, firstly we need to develop an experimental environment to conduct rigorously designed experiments in which control variables operated under well-defined conditions and performance measures were observed. In this paper, we outline our approach to design the experimental environment, that is based on the Unified Modeling Language(UML).

원자로 압력용기용 SA508 cl.3강재의 서브머지드 아크 용접부에서 입열량이 미세조직과 인성에 미치는 영향

고진현,김세철,서윤석 한국기술교육대학교 2003 論文集 Vol.10 No.1

The microstructures of RPV SA508 class 3 steel multipass weld metals with submerged arc welding process by varying the heat inputs of 2.4kJ/mm and 3.6kJ/mm were investigated by optical and scanning electron microscopes. The microstructures were also compared between as-welded and postweld heat treatment conditions. The relationships between weld microstructures and toughness as well as hardness of weld metals were evaluated. The toughness and hardness of weld metals were enhanced a little in the lower heat input of 2.4kJ/mm. The microstructures of welds made at the lower heat input used in this study consisted of a little higher proportion of acicular ferrite than those of welds made at the higher heat input(3.6kJ/mm), in which unfavorable microstructure to toughness such as grain boundary ferrite and banitic structure were increased.

실버세대를 위한 핸드폰의 조작패널에 관한 연구

윤한경,송복희,정광태 한국기술교육대학교 2004 論文集 Vol.10 No.2

The main purpose of this study is the modeling of older adult's index finger to determine the dimensions of key buttons in the mobil phone for the older adult, since our previous result showed that the movement time of old persons was affected by the interaction of the moving distance and the button size[1]. Also, our preliminary observation of older adults showed a different switching activity from younger generation. It requires that the dimension of button for easy dialing and switching mechanism of button for feedback of switching are needed further study, since the operation time of older people is related to the size of button and operation distance. The previous our results showed the operational time increased as reducing the button size or expanding of the operational distance[2,3]. However their is no available data nor quantitative data in several guidelines for developing universal products. Most of guidelines suggest that the bigger switch and the larger size font are better for older adults, but the minimized size of mobile phone does not mean more comfort. That suggests the size of button in universal mobile phone needs to be optimized to satisfy the demand of universal design or older adults. Total 60 of above 65 older adults, 20 in the biggest city, 20 in the medium city, 20 in the rural agricultural area, participated in our investigation for modeling their index finger. 95 percentile of the effective width for index fingers of them was 6.94mm and 99 percentile was 7.49mm. The effective width suggests that the area of a certain key button has to be occupied by itself without any superimposing of any another key button. The result shows that the minimum of touching region of the pushed button is the circle with the diameter of 7.49mm at least and this reason has to be a physical interference free from the other key button or the structural configuration.

Cr과 Mo 합금첨가에 따른 고크롬 백주철에서의 보라이드층 두께 및 특성 변화에 관한 연구

박해웅 한국기술교육대학교 2003 論文集 Vol.10 No.1

A series of high Cr white cast irons were boronized using a pack-cem entation process and characterized in terms of the process temperature and the contents of Cr, Mo, and C in the cast iron. As the contents of Cr and Mo increased from 12 to 30 wt.%, the thickness of the boridelayer decreased, while the hardness of the matrix increased from 43.5 to 52.3 HRC after a boronizing process. The thickness of the boride layer was increased, when the process temperature (up to 1000℃) or the content of carbon (from 2.0 to 3.3 wt.%) was raised. The hardness of the boride layer was about 1800 HV, much higher than that of the matrix. The boronized cast iron showed higher corrosion resistance than that of the non-boronized, and the corrosion resistance improved with the thickness of theboride layer when tested in 6 wt.% FeCl₃ solutions.

중심점 탐색없는 지문 정합 알고리즘에 관한 연구

장경식,임재영,최영규 한국기술교육대학교 2003 論文集 Vol.10 No.1

We propose a fingerprint matching algorithm that compares distance and included angle sequence among minutiaes with another's. We defined this sequence as minutiae constellation which has a basic unit is distance and included angle sequence among three minutiaes. This algorithm searches nearest minutiae from a minutiae and repeatedly searches nearest minutiae from just before searched minutiae. It doesn't search core and is independent of translation and rotation because matching stage only uses distance and included angle sequence.