NEC를 적용한 전력 간선의 크기 선정에 관한 연구

閔恒基,金成洙,金佶永 弘益大學校 科學技術硏究所 2002 科學技術硏究論文集 Vol.13 No.-

Electricity receiving facility is the equipment which is composed of a receiving end and a primary transformer, and transformer facility is the transformer equipment connected to the switchboard which distributes the electricity to loading facility. In general, these two facilities are called an electricity receiving-transformer facility. Electricity receiving-transformer facility should be designed well in order to supply high quality electricity in safe and reliable condition. Public electric utilities supply the suitable voltage to the receiving end based on working electric power, then the voltage is changed into a rated voltage of loading facility at the isolated plant power. This facility capacity should be enough in order to supply the electricity to the loading facility, and the expecting power needs should be predictable in order to prevent the trouble from the group of loading facilities in advance. The power loading is carried out through power feeders from receiving end to distribution board. Thickness of power feeders is determined according to the endurable ability for overload or fault current of loading facility, and wrong selected feeders could make an fatal accident to a wide range system because of so many feeders in a building are connected with branch circuits. For a long power feeder, the allowable voltage drop and mechanical intensity should be checked carefully.

Measurement of Fibrin Fiber Strength

민항기,L. Jawerth,R. Superfine 한국진공학회 2005 한국진공학회 학술발표회초록집 Vol.- No.-

다중지능이론을 적용한 웹기반 진로안내시스템의 설계 및 구현

민항기,이재무 한국정보교육학회 2007 정보교육학회논문지 Vol.11 No.3

본 연구는 개인의 일생에서 중요한 의사결정의 하나인 진로선택에 도움을 주기 위한 웹기반 진로안내 시스템을 개발 하는 것이다. 초등학교에서의 진로교육은 직업선택에 필요한 초보적인 지식, 일에 대한 기본적인 태도와 가치관의 형성이 목적이므로 개인의 적성과 흥미를 고려한 다양한 직업의 종류에 대한 안내가 중요하다. 그러나, 기존의 연구는 대부분 검사결과를 알려주는 수준에 머물려 있다. 따라서, 본 연구는 잠정적 진로선택 단계에 있는 초등학교 고학년에게 적합한 진로발달검사를 실시하고, 결과에 맞는 직업의 종류를 안내하는 웹기반 진로안내시스템을 개발하였다. 본 진로안내시스템은 검사결과를 알려주는 것에서 발전하여 검사결과 값을 우수지능 3개로 제시하여 검사자의 학습욕구를 자극하였다. 그리하여 학습자가 자신의 우수한 지능영역을 알고 이 지능과 관련된 직업의 종류와 하는 일에 대해 효율적으로 학습하고, 자신의 진로에 대한 인식과 진로선택의 바른 자세를 배울 수 있을 것으로 기대된다. This study is to develop a web-based career guidance system to be a help making a decision on one’s occupation, which is important for a person’s life. As career development education for higher grades of elementary school aims at providing basic knowledge necessary for career choice and forming a basic attitude toward occupation and values, it is desirable to carry out the guidance of a variety of occupations on the basis of personal interest and aptitude of individual students. Previously, however, most studies have remained at the level where simply test results are notified. Therefore, the study administered a career development test fit for higher grades of elementary school who are at the stage of potential career choice and developed a web-based career guidance system in which suitable occupation types are advised of based on the results. Beyond notifying test results, the developed career guidance system presents 3 excellent intelligences, rather than converting test results into scores. Thus, it is expected that the system will help students understand their areas of excellent intelligence, efficiently study related occupation types and duties, and learn to have awareness and make a better decision in relation to their career.

공항 수·배전 설비 표준화

閔恒基,元鎭凞 弘益大學校 科學技術硏究所 2003 科學技術硏究論文集 Vol.14 No.-

Airport facility is a very important infrastructure that becomes an external creditworthy index and a linear barometer of the competitive power of a country. Among them, receive and supply facility of electric power in the airport is one of the most important part for the peculiarity, trustability, and safety of the airport. In this paper, we sorted domestic airports as 4 classes by code to accomplish standardization for receive and supply facility of electric power of the airport. We also established a definition and range of the receive and supply facility of electric power. Since no standard exists at present, we analyzed problems and suggested a standard for receive and supply facility of electric power of the existing airports. Finally, we present a standard single-line diagram by airport grade, and also present a system grade standard of receive and supply facility of electric power of the airport.

주사 투과 현미경 제작

閔恒基 弘益大學校 科學技術硏究所 1999 科學技術硏究論文集 Vol.10 No.1

We developed scanning tunneling microscope(STM) which could operate in ultrahigh vaccum as well as in air pressure, over wide range of temperatures extending from room temperature to liquid-nitrogen temperature(77K). Designed STM was consist of a compact and rigid enough head in order to reduce and damp the external vibration. Tube-shaped scanner, and the stick-slip walker were adopted to approach the tip to the sample surface. The STM was tested for scanning image of highly oriented pyrolytic graphite(HOPG) as a preliminary experiment in air.

K/W(110)의 표면 및 계면에 관한 연구

閔恒基 홍익대학교 산업기술연구소 1993 産業技術 Vol.2 No.-

The purpose of this study is to determine reactivity of K/W(110) interfaces which were investigated by Auger electron spectroscopy(AES) and angel resoved ultraviolet photoemission spectroscopy(ARUPS). Clean Auger spectra of potassium deposited tungsten were obtained. The surface contours and work function for the surface states were investigated using ARUPS. After potassium deposited on the W(110) surface, the feature of Fermi contours were changed. Electron pockets were extended clearly, but hole pockets were disappeared except one which is around N―

진공기술과 표면과학에 관한 고찰

閔恒基 弘益大學校 1989 弘大論叢 Vol.21 No.2

In this paper, vacuum technology with kinematic motion of gas and vacuum Pumps is briefly studied. Also the importance of studying surface science is mentioned. The techniques of surface study are explained. The present level of surface study in Korea is also mentioned in a viewpoint of basic science and technolog development.

TiC(111) 단결정의 전자 특성에 관한 연구

邊大鉉,閔恒基 弘益大學校 科學技術硏究所 1992 科學技術硏究論文集 Vol.2 No.-

Clean single crystal of Titanium Carbide[TiC(111)] has been studied by REELS(reflection electron energy loss spectroscopy) at room temperature for Ep(electron primary energy) between 100 and 450 eV in UHV system. Oxygen adsorption were used to invesgate the bonding strength. Temperature REELS were also measured. Loss peaks are compared with the existence band structure and DOS(density of states) calculated from several authors.

LEED를 이용한 Co/Cu(001) 초박막의 구조 연구

閔恒基,安秉男 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1

We studied the growth mode and stoichiometry of ultrathin Co film on Cu(001) single crystal surface by Auger electron spectroscopy and dynamin LEED analysis. I/V characteristics of LEED spot of ultrathin Co/Cu(001) system were obtained by video LEED system and analized by tensor LEED program and applied ATA (average t-matrix approximation). The structure and compositional variation as a function of temperature were traced. We found that a significant amount of Cu atom was segregated from the substrate to the surface of the Co film at room temperature.

피브린 파이버의 영률 측정

閔恒基 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-

Fibrin clots perform the mechanical task of creating blockage that stems blood flow in vivo. to understand the forces that contribute to clot strength and elasticity, we measured of fibrin fiber Young's modulus using a combined atomic force microscope(AFM) and optical microscope system. With this system, we are able to image fibrin fibers in aqueous conditions and monitor the deformation of the fiber while measuring the applied force simultaneously. Specifically, we have determined breaking strain and Young's modulus of fibrin fibers for across-linked versus uncross-linked fibrin. Normal recombinant fibrinogen was clotted by thrombin with/without Factor XIII. Recombinant fibrin fibrs were fluorescently labeled with quantum dots. We have observed breaking strains of 90% for uncross-linked fibers and 300% for crosse-linked fibers. We have also determined Young's modulus for cross- and uncross-linked fibers by 0.4 MPa and 2.7 MPa respectively. Thrombin polymerized fibrin fibers show largely elastic behavior.