철도 선로 안전시설에 관한 연구(Ⅰ)

이승원,신승교 경복대학 2004 京福論叢 Vol.8 No.-

본 연구에서는 표준화가 필요한 혹은 가능한 주요 안전시설에 대하여 필수적으로 요구되는 최소한의 지침작성을 위하여 다음과 같이 연구하다. 먼저 가드레일의 종류 및 설치방법 등에 대하여 고찰해보고 국내 도시철도의 가드레일 부설기준 및 본선레일과의 높이차, 이음매, 부설길이, 체결력에 대하여 자세히 검토하였다. 또한, 차막이의 종류 및 각각의 특성에 관하여 조사하고 충돌하중, 한계속도, 설계용량 등에 대하여 요약하였다. 이상의 연구를 통하여 도시철도 선로시스템의 안전시설 중 가드레일과 차막이 시설에 대하여 국내여건에 적합하도록 체계화된 표준화를 위한 기초 자료를 정립하였다. In this paper, safety requirements for guard rail and buffer stop is studied to establish a standard. First, various kinds of guard rails and their construction methods are investigated. Researches on the level difference of main track and guard rail, joint, length, and fastening force of guard rail are done. Second, the classification of buffer stop and its characteristics are examined, and the impact force, speed limit and capacity of buffer stop are summarized. From this study, fundamental data on the safety facilities (especially guard rail and buffer stop) of urban railway system are established.

자살에 대한 태도(Ⅱ) : 대학생을 중심으로 among undergraduates

이미형,정승교 최신의학사 1991 最新醫學 Vol.34 No.8

교란 상관 관계 분석 그래프를 이용한 발전소의 고장진단에 관한 연구

이승철,이순교 중앙대학교 기술과학연구소 1998 기술과학연구소 논문집 Vol.28 No.-

발전소 운전중 기기의 고장이 발생할 경우, 고장은 순간적으로 clear 되거나 또는 지속적으로 유지되기도 하고 때로는 casecade되어 다른 고장으로 파급되기도 한다. 이러한 다양한 고장들의 경과상태와 파급양상은 시스템 및 기기의 운전특성 및 plant내에서도 상호 연결상태 고장자체의 severity 정도에 따라 복잡하게 전개되어, 통상 중대한 고장이나 교란의 발생시에는 파급되어 발생되는 교란까지 합하여 발전소의 중앙제어실에는 수많은 경보가 울리게 된다. 이 경우 파급되어 발생되는 교란들중 관측이 되지 않은 교란들은 교란들의 전후 파급관계를 이용하여 그 발생을 추정할 수 있다. 본 연구에서는 발전소의 운전 감시와 고장 진단을 체계적으로 수행하기 위해 개발한 DIAG(Disturbance Interrelation Analysis Graph)라 불리는 자료구조를 사용하여 그래프 상에서 내삽(interpolation)과 외삽(extrapolation)을 통해서 관측이 안된 고장을 체계적으로 추적하는 방안에 대하여 논하였다. In a power plant, once a disturbance occurs, it can be either persistent, self cleared, cleared by the automatic controllers or propagated into another disturbance until it subsides in a new equilibrium or a stable state including a total system shut down. For safe operation of the power plant, causes of the disturbances should be found and removed quickly as possible in order to prevent potential fatal disturbances. A data structure called a disturbance interrelation analysis graph(DIAG) is developed in this paper, trying to capture all the necessary knowledge and to show explicitly the reasoning paths for disturbance detection and diagnosis.

참외 單性化 遺傳에 關한 硏究 : 1) 單性花의 遺傳機構와 實用形質에 關한 調査 1) Investigation on Genetical Mechanism of Monoecious Type and Practical Character

李昇雨,鄭德敎,金秉煥,金岩東 동국대학교 농림과학연구소 1971 農林科學 論文集 Vol.4 No.-

Using F_1 seed production on monecious flowers of Cucumis melo L., three of monoecious and four varities of dioecious were used as material in order to study inheritable mechanism and their characteristics. 1. Monoecious type were segregated 20 : 0 (1 : 0) from Go to G_1, 20 : 0 (1 : 0) F_1 between andromomoecious and 47 : 13 (3 : 1) as well as 33 : 7 (3 : 1) in F_2. Consequently it seems to be inherited by dominant single gene of AA in monoecious and recessive gene of aa in andromonoecious type. 2. However, it was guessed to be possessed of gene type that was effected by environment in monoecious type of U.S.S.R. 409. 3. Three varities of monoecious were poor condition in the practical quality aspect. The variety of U.S.S.R. 409 that was under the control of environment and it was extremly segregated quality has possiblity of useful quality selection compere with others respectably.

설계추진단계별 설계VE의 효율적 적용 방안

이승훈,서용칠,구교진,현창택 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

The purpose of this study is to propose an efficient design-VE job plan and applicable methods in each phase of design process. This is for more effective and practical use of VE in design phase. This study focuses on differences of the VE target selection phase and function analysis phase in each phase of design process. In the phase of preliminary design, conceptual sketch, size, use, or major spaces of project are selected for VE target and function assessment step is skipped because present cost and function cost cannot be produced easily in early in early phase of design. At the end of preliminary design phase, function review phase is added which consists of function satisfactory indices review step and unsatisfactory function removal step.

쇼트피닝된 스프링강의 비틀림 피로강도에 관한 연구

신용승,정성교,이승호 서울産業大學校 1998 논문집 Vol.47 No.1

Torsional fatigue tests were carried out on shot peened and unpeened specimens. The residual stresses are changed into compressive stresses through shot peeing. The maximum values of the compressive residual stresses as well as hardness was increased by shot peening near the surface layer. It was also found that fatigue strength was improved remarkably by shot peening because of the increase of compressive residual stresses and hardness near the surface layer. The observed fatigue life in both cases of unpeened and shot peened specimens, is expressed. As a result, the fatigue life was improved but tensile strength was little effected after shot peening.

액체배양에 의한 Monascus rubber의 적색 색소 생산을 위한 최적 배양 조건에 관한 연구

서승교,이창호,우철주 한국식품저장유통학회 ( 구 한국농산물저장유통학회 ) 2004 한국식품저장유통학회지 Vol.11 No.1

Monascus rubber KCTC 6122를 이용하여 액체 배양을 통한 실험균의 적색 색소의 생산을 위한 배양 조건의 최적화에 관한 결과는 다음과 같다. 실험 균주가 생산하는 적색 색소의 최적 배양 조건은 탄소원으로 rice powder 4% 첨가, 질소원으로 NaNO₃ 0.2%, 인산염으로 Na₂HPO₄의 농도가 0.3%, MgSO₄의 농도가 0.15%일 때 가장 높은 적색 색소 생성을 나타내었다. 배양 온도는 30℃, 초기 pH가 6.5, 진탕속도를 150 rpm, 배양 시간 8일 일 때 적색 색소의 생성능이 흡광도 70.29로 가장 우수하였다. The optimum cultural conditions for production of red pigment from Monascus rubber KCTC 6122 is liquid culture were studied. Monascus rubber KCTC 6122 was shown to give the maximum production of red pigment in the medium containing 4% rice powder, 0.2% NaNO₃, 03% NaHPO₄and 0.15% MgSO₄. The optimum culture conditions, temperature, initial pH and shaking speed were 30℃, 6.5 and 150 rpm, respectively. The red pigment production reached a maximum level at 8days of cultivation.

선박용 유배출 감시 장치(ODME)를 위한 유분 농도계 설계

손교훈,이승희,김재형 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-

본 논문에서는 태형 탱커선의 의무 장비인 유배출 감시 장비 (Oil Discharge Monitoring Equipment)를 위한 유분 농도계의 설계에 대하여 연구하였다. ODME는 국제해사기구(IMO)에서 규정된 ton 이상의 대형 선박에 의무적으로 설치하도록 규정하고 있으며 이는 날로 심각해지는 해양 오염을 방지하는데 목적이 있다. ODME의 구성요소 중 가장 중요한 것은 유분 농도계이며 이는 선박에서 배출되는 물에 포함된 유 성분을 ppm 단위로 계측하는 것이다. 본 연구에서는 선박에서 사용이 용이한 산란방식의 유분 농도계의 설게에 대한 농도 계산 알고리즘에 대하여 고찰하였으며 0~100ppm 범위에서 ±5%의 오차 이내로 측정이 가능함을 보였다. 이는 IMO의 규격에 만족하는 수치이다.

가스유량에 따른 흡입마취제의 섭취

김교상,이동호,김윤기,이청,전세웅,서정국,유희구,김경헌,승익상 대한마취과학회 1989 Korean Journal of Anesthesiology Vol.22 No.6

Any factor which increases rebreathing (such as a decrease in inflow rate or an increase in ventilation) or increase uptake (such as an increase in solubility or in cardiac output) will lower the inspired anesthetic concentration. This in turn, will be reflected in an slower rate of anesthesia induction. In a circle absorption system, the inspired anesthetic concentration may be reduced from the inflowing concentration by rebreathing of anesthetic depleted gas. Semiclosed system, most widely used modern anesthetic system was tested to determine what effect the inflow rate had on the rate of rise of anesthetizing alveolar concentration of halothane and enflurane. The results were as follows: 1) High fresh gas inflow rate put the inspired anesthetic concentration close to that of inflow more rapidly. 2) In halothane anesthesia with 4 and 6 L/min of fresh gas flow, the anesthesia induction time was about 20 and 15 minutes respectively. But there was marked delay of the development of anesthesia by 2 L/min of fresh gas fiow. 3) In enflurane anesthesia, the anesthesia induction time was within about 10 minutes without respect to inflow rate. With these results, in general inhalation anesthesia with halothane or enflurane when a semiclosed technique and 100% oxygen are employed, a total gas flow at 4 to 6L per minute is recommended to establish a satisfactory induction and maintenance level of anesthesia.

특수가공용 공작기계의 쇼트피닝기 모델설계에 관한 연구

신용승,이승호,서유원,정성교 서울産業大學校 1999 논문집 Vol.49 No.2

As developing the technology in industry, the materials with superior grade of stiffiness and lightness are required, and hence the higher fatigue strength characteristics are necessary. Thus, the non-traditional machining to increase fatigue strength is becoming influential as very important technology. Considering environmental problem, the shot peening process is selected as a good process to increase fatigue strength. But the data related to shot peening process are not enough in this country. Shot peening process is essential to ensure repeatability and uniformity on a part to part and lot to lot basis, while conforming to the applicable specifications. The shot material, size, shape and hardness as well as velocity and impact angle must be controlled to provide consistency in peening results. In order to effectively control the shot peening process, parameters must be addressed in the following order, such as media control, coverage control, intensity control, equipment control and so on.