도로 보도블록 기초재료종류에 따른 시공성에 관한 연구

김영수,채영수,송용선 경북대학교 산업기술연구소 1991 産業技術硏究誌 Vol.19 No.-

The river sand has been used as a basement of footway block. To find a excellent material substitute for river sand, five materials of river sand, sea sand, granite soil, woven geotextile and nonwoven geotextile are tested to compare the superiority for this purpose. And the experimental field test construction is performed in the three different areas, Suwon; Maetan, Inchun; Kuwol and Kimhae; Uhband. Comparing the properties of five selected materials, the nonwoven geotextile is superior in workability and flatness as a basement of footway block material.

개선된 Bridgman법으로 성장한 Bi₂Sr₂CaCu₂O_(8+δ) 單結晶의 초전도성

채건식,손인호,설정식,이수대,김영국,전동성,오재근,강성욱 경남대학교 환경문제연구소 1995 환경연구 Vol.17 No.-

The Bi₂Sr₂CaCu₂O_(8)+_(δ) single crystals are grown from the melt using a stoichiometric starting composition fer the cautions. The size and thickness of the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals depends on the cooling rate. The lower the cooling rate, the bigger and thicker the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals become. Bi₂Sr₂CaCu₂O_(8)+_(δ) X-ray diffraction(XRD) measurements of the single crystals were carried out using the radiation source of Cu Kα . In these Patterns only the (0,0,2n) diffraction appeared. The result indicated that the cleared surface of the single crystal was of the a-b face, and that the single crystal had a single phase without any undergrowth with 7K and 85K phases. In addition, although the figure is not shown, XRD patterns from (006) to (00□) were observed in the range of 2θ=0 to 60 degrees. The characterization of as-grown single crystals have been analyzed by Laue X-ray backsdattering along the c-axis and X-ray precession experiments. The result of magnetic moment vs Tc in 10 Gauss for a crystals were measurements indicated that the samples have a superconducting transition temperature of 85K.

이트리아 첨가 붕규산염 유리로 제조한 알루미나-유리 복합체의 강도 평가

채민수,배태성,이주형,원대희,진영철 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.1

This study was performed to investigate the strength of dental alumina-glass composites. Four different brosilicacte glasses containing 1, 3, 6, 9 mol% Y₂O³ were prepared. Alumina compacts were prepared by pressing 150㎏/㎠ and sintering at 1100℃ for 2 hours. Dense composites were made by infiltrating partially sintered alumina with at 1200℃ for 6 hours. The obtained results were summarized as follows: 1. With increasing the amount of Y₂O₃ the peak of exothermic heat and softening point were shifted to the higher temperature. 2. Borosilicate glasses showed the coefficient of thermal expansion in the range of 6.36 to 6.56×10-6/℃. 3. The maximum biaxial strength of 385.7±34.4MPa was obtained with an addition of 6mol% Y₂O₃. 4. The observation of fracture surfaces showed the crack deflection and crack bridging and that appeared to be the principal strengthening mechanism in the alumina-glass composites.

擁壁底面 活動防止壁이 設置된 켄틸레버식 擁壁의 安定에 關한 硏究

蔡瑛秀 수원대학교 산업기술연구소 1995 산업기술연구소논문집 Vol.10 No.-

The criteria on the safety factors against sliding and overturning of cantilever retaining wall are different from the home and abroad manuals, codes and references each other. This study is primarily concentrated on the safety factors against sliding with base key according to the famous home and abroad manuals, codes and references using a presumptive dimensions of cantilever retaining wall. Also it have introduced that recent studies on the location of resultant active earth pressure acting on back of cantilever retaining wall and the location of the point for computing the driving moments. This paper is helpful to guide the criteria of stability against sliding with base key of cantilever retaining wall this after.

뇌성마비 환아의 발달 평가와 유발 전위, 뇌파,뇌 자기 공명 영상의 비교연구

서정수,김태민,채진목,김영경,김봉옥 大韓再活醫學會 2000 Annals of Rehabilitation Medicine Vol.24 No.4

보강재 길이에 따른 보강토 옹벽의 지진저항 특성 연구

채영수, 윤원섭 水原大學校 2012 論文集 Vol.26 No.-

ABSTRACT In order to understand evaluation of the seismic stability of a reinforced earth retaining, we made chambers of 1:10 (the ratio of the miniature), considering the law of similarity based on drawings of representative cross sections. And we measured an increase in acceleration, earth pressure, and displacement after applying Hachinohe wave(long period), Ofunato wave(short period), and artificial wave, complying with the domestic standards, in order to evaluate the external stability of a reinforced earth retaining wall during earthquake based on the measurements. As a result, a unreinforced earth retaining wall collapsed at 2g of seismic acceleration. But a reinforced earth retaining wall was evaluated to ensure proper stability as well, with respect to the earth pressure gauge, the increments of earth pressure tend to be raised significantly in the upper than the lower and found that the longer reinforcement length, the displacement of reinforcement earth retaining walls was decreased and the earth pressure was increased. 본 연구에서는 보강토 옹벽 구조물의 지진저항 특성을 파악하기 위하여 대표단면을 기초로 하여 축소모형의 비율에 해당하는 상사법칙을 고려하여 1:10의 상사비로 토조를 제작하였다. 그리고 국내 설계기준에 준하여 장주기인 Hachinohe파, 단주기인 Ofunato파, 인공지진파를 가진하여 실험 대상단면에 대해 가속도변화, 토압, 변위를 측정하고, 측정된 결과를 통하여 보강토 옹벽의 지진 시 외적안정성을 평가하였다. 실험결과 보강재를 설치하지 않은 옹벽구조물에서는 지진가속도 0.2g에서 붕괴되었으나 보강재를 설치한 보강토 옹벽에서는 안정성을 확보하는 것으로 평가되었다. 토압계 측정결과 하부보다 상부에서 지진에 의한 토압의 증가량이 크게 발생되었으며, 보강재 길이가 증가할수록 보강토 옹벽의 변위는 저감되고, 토압은 증가되는 결과를 보였다.

水平移動 變位壁體에 作用하는 土壓

蔡瑛秀 수원대학교 산업기술연구소 1986 산업기술연구소논문집 Vol.1 No.-

The static and dynamic active earth pressure are methods presented, applying by the Chae's method and Dubrova's theory in the case of pure translational wall movement. The results computed by the proposed methods are compared with the conventional theoretical values.

효율적인 군 전직지원체제 정립 방안

정철영,고재관,황원채,윤희철,박가열,김재호,이성식,김동승,표성일,이건남,양안나,최수정,김은석 한국직업능력개발원 2008 직업능력개발연구 Vol.11 No.1

이 연구의 목적은 제대군인에 대한 효율적인 전직지원을 위해서 현행 전직지원 프로세스에 대한 개선 안과 이에 따른 국방부, 국가보훈처 등 제대군인 전직지원관련 기관 간의 역할분담 및 연계방안에 대해서 제안하는 것이다. 연구는 크게 세 가지 과정을 거쳤다. 첫째, 국내 군 전직지원 실태를 분석하여 문제점과 시사점을 도출하였다. 둘째, 이러한 문제점과 시사점, 군 전직지원 선행연구를 종합하여 효율적인 군 전직지원 프로세스 안을 제시하였다. 셋째, 구축한 군 전직지원 프로세스 안에 따라 주요 군 전직지원 관련 기관인 국방부, 국가보훈처의 역할 분담 안을 제안하였다. This study aims to suggest an improvement plan for the support process of effective occupation change for discharged soldiers and then role assignments among related institutions for supporting discharged soldiers such as Ministry of Defense, Ministry of Patriots and Veterans Affairs, Ministry of Labor and the cooperation plan among the institutions. The study was made in three steps. First, after analyzing currents support facts and status for discharged soldiers, it induced its problems and implications. Second, integrating the findings of previous studies related to support plan on occupation changes for the discharged soldiers, Problems and implications mentioned above, it constructed effective occupation change process for discharged soldiers. Then, according to the established process, it suggested role assignments such as Ministry of Defense, Ministry of Patriots and Veterans Affairs, Ministry of Labor.

전자 전단 간섭법과 유한요소법을 이용한 압력용기의 내부결함 측정에 관한 연구

강영준,강형수,채희창 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.2

The application of laser in pipelines was started from the base of using laser in nuclear facilities, chemical industries and poser plants. Because laser can be delivered to a remote area without any difficulties, the application of laser in many industries can solve many difficulties from limitation of access in danger area and reduce the risks of workers. Therefore, we developed a new experimental technique to measure internal defects of pressure vessels with a combination of shearography and image processing technique. Conventional NDT methods have been taken relatively much time, money and manpower because of performing as the method of contact with objects to be inspected. But digital shearography is a laser-based optical method Much allows full-field observation of surface displacement derivatives. This method has many advantages in practical use, such as loss sensitivity to environmental noise, simple optical configuration and real time mea-surement. In this paper, we find the optimum shearing magnitude with FEM and experiment and measured internal crack length of the pressure vessels at a real time and estimate the error of the results.

주사전자현미경을 이용한 무당벌레에 기생하는 무당벌레기생파리(Degeeria separata)의 외부형태적 특징

윤영남,김남성,김기덕,박수진,서미자,채순용 충남대학교 농업과학연구소 2000 농업과학연구 Vol.27 No.1

External morphological characteristics of male and female of Degeeria separata, which was endoparasited in adult of the Asian ladybird, were studied by using the scanning electron microscopy(SEM). The antenna of Degeeria separata was consisted of three segment and arista. Anstae were about 750㎛ length and 30㎛ in diameter. The surface of antennae was covered with many sensilla. They were long or short, slender or thick, and straight or curved. Each three morphological types of sensilla were observed on the second and third segment of antennae. The mouthpart was sponging type. It was consisted with clypeus, labellum, labium, labrum, and maxillary palp. The labellum is 400㎛ width and double folded vertically. The leg consist of tarsus, tarsus claw, pulvilli, and empodium.