• 한국전산유체공학회:학술대회논문집
• /
• 한국전산유체공학회 2005년도 추계 학술대회논문집
• /
• pp.275-279
• /
• 2005

The vortex convection and induced flow field behind the KARI 3m x 4m LSWT gust generator was computed by using Computational Fluid Dynamics. For the accurate simulation of vortex convection, inviscid, laminar, Spalart-Allmars k-e and k-w turbulence models were tested with the NAL gust generator configuration and Spalart-Allmaras turbulence model was selected for the prediction of induced flow field behind the KARI LSWT gust generator. The wind tunnel test was also carried out at KARI LSWT and the results were compared with CFD prediction.

• 한국농업기계학회:학술대회논문집
• /
• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
• /
• pp.1302-1311
• /
• 1993

In the 90 years or so since the beginning of the 20 th century , orchard growing and agricultural fields in Japan have undergone considerable change in terms of production volume, a seen in Fig. 1. as this change in volume progressed, sorting and packing machines have also grown from the first wooden tools, almost too simple to be called " machines" into sophisticated devices that bring together diverse technologies such as machinery , electronics, and optics. Nowadays, Japan/s agricultural industry is facing unprecedentedly serious labor shortage and the rapid aging of its experienced growers and producers, In additions, Japan has changed from a society oriented towards high-volume production and consumption to a more selective society which prefers smaller volume with the tastes of naturally ripended produce. With consumer trends changing there is a new demand on the part of growers for equipment that can not only measure the external quality of produce , but can measure inte nal quality as well.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 1989년도 춘계학술대회 논문집
• /
• pp.49-51
• /
• 1989

The effect of Mo elenent and annealing condition on the magnetic properties were investigated in Fe$_{80}$B$_{12}$Si$_{8}$ amorphous alloy. With increasing Mo contents, soft magnetic properties were improved by decreasing coercive force and increasing maximum permeability. These improvements were attributed to the decreasing of magnetostriction by Mo addition. The annealing treatment also improved the soft magnetic properties of (Fe$_{1-x}$ Mo$_{x}$)$_{80}$ B$_{12}$ Si$_{8}$ amorphous alloys. It could be thought that these improvements were ascribed to the relaxation of internal stress.nal stress.ess.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1993년도 정기총회 및 추계학술대회 논문집 학회본부
• /
• pp.234-236
• /
• 1993

Dielectric properties of low viscous silicone oils have been investigated as a function of frequency and The increase of polymerization degree was attributed to presence of Si-O-Si bonds and their increased dissociation factor. The application of the Clausius-Mosotti equation on the low viscous silicone oils, it has been previously assumed that the oils were dilute solutions of polar molecules. In the silicone oil the Si-o and O-Si bonds give dipole polarization. Simple relations have been found which dipole moment and activation energy as a function of number of Si atoms in the low viscous silicone oils.

• 한국어류학회지
• /
• 제23권3호
• /
• pp.246-249
• /
• 2011

망둑어과 (Family Gobiidae)에 속하는 Gymnogobius taranetzi 25개체가 강원도 삼척시와 양양군의 기수역에서 채집되었다. 본 종은 형태적으로 망둑어과의 다른 꾹저구속 종들과 유사하나 양안 사이의 안견갑관이 감각공기열로 대체되어 전안견갑관 개공 C가 없으며, 산란기의 암컷은 체측에 황색의 가로띠가 나타나는 특정을 갖고 있는 점에서 구별된다. 본 종은 동해연안에 분포하는 점을 들어 국명을 "동해날망둑"이라고 명명하였다.

• 제어로봇시스템학회논문지
• /
• 제14권4호
• /
• pp.399-405
• /
• 2008

Recently, robot technology is actively going on progress to the field of various services such as home care, medical care, entertainment, and etc. Because these service robots are in use nearby person, they need to be operated safely even though hardware and software faults occur. This paper proposes a Fault-Tolerant middleware for a robot system, which has following two characteristics: supporting of heterogeneous network interface and processing of software components and network faults. The Fault-Tolerant middleware consists of a Service Layer(SL), a Network Adaptation Layer(NAL), a Network Interface Layer(NIL), a Operating System ion Layer(OSAL), and a Fault-Tolerant Manager(FTM). Especially, the Fault-Tolerant Manager consists of 4 components: Monitor, Fault Detector, Fault Notifier, and Fault Recover to detect and recover the faults effectively. This paper implements and tests the proposed middleware. Some experiment results show that the proposed Fault-Tolerant middleware is working well.

• 복식
• /
• 제31권
• /
• pp.223-236
• /
• 1997

The purpose of this study is to set up the concept and the structure of 'the image' theoretically. The study is carried out by the literature research. The image is constituted of several concepts which are as followed: The concept of definition: perception cognition/impression. The concept of target: objective/per-son The concept of content: internal/exter-nal The concept of level :lower/upper Especially levels of image are divided into 3 different levels which are 'simple level' 'complex level 1' 'com-plex level 2' The concept of image is classified into the horizontal and the vertical structure. The concepts of the definition the target the con-tent are included in horizontal strcture and the concept of the level is included in the ver-tical structure.

• 대한화학회지
• /
• 제7권1호
• /
• pp.13-16
• /
• 1963

Thermal neutron activation analysis was applied to determine the trace amount of Vanadium and Manganese in Buyo and Kumsan Ginseng. These elements have been regarded to have great nutritional value and one of the indispensable factor in the growth of ginseng. The TRIGA MARK II Reactor in Atomic Energy Research Institute was used for the neutron source. The samples were irradiated for 10 minutes for Vanadium and for 5 minutes for Manganese at the neutron flux of about $1.28{\times}10^{12}n/cm^2/sec$ and the RCL 256 Channel Pulse-Height Analyzer connected with $2"{\times}2"$ Nal(Tl) was used for activity determination. The amounts were about 0.02 ppm for Vanadium and 20 ppm for Manganese, and it was also found that the amounts of the elements were slightly different depending on the kinds of ginsengs.

• Journal of Advanced Marine Engineering and Technology
• /
• 제23권3호
• /
• pp.369-378
• /
• 1999

This paper presents position control of an electro-hydraulic servo system whoch is operated by four 2-2way high speed on-off valves with either PWM PID control method or sliding mode control method, The advantages of using high speed on-off valves instead of electo-hydraulic servo valves or electro-hydraulic proportional valves are low price robustness for oil contamination and direct control without a D/A converter. The system consists of load cylinder inertia car potentiometer and external load cylinder. The experiments were carried out under several conditions and the results were compared. As a result the sliding mode method has shown good control performance and the robust and stable positioning of the elector-hydraulic servo system can be achieved accurately.

• 미생물학회지
• /
• 제30권1호
• /
• pp.8-14
• /
• 1992

Pseudomonas sp. DJ77로부터 extradiol dioxygenase 유전자(phnE)를 클로닝하고 염기배열을 결정하였다. 921 bp의 open reading frame (ORF) 이 존재하였고 개시코돈 앞에서 Shine-Dalgarno sequence를 발견하였다. phnE 유전자에서 만들어지는 PhnE 단백질은 분자량이 34,449 Da 인데 SDS-polycrylamide gel 전기영동에 의해 측정된 분자량과 일치하였다. PhnE는 NahH, XylE, DmpB 등과 아미노산 배열의 상동성의 약 50% 였다. DJ77에는 bphC와 같은 3형의 extradiol dioxygenase 유전자는 발견할 수 없었다. DJ77 과 JM101(pPE17)은 catechol, 3-methylcatechol, 4-methylcatechol, 2, 3-dihydroxybiphenyl 등의 기질을 meta-cleavage 하여 노란색 화합물을 생성할 수 있었다.