• Proceedings of the KIPE Conference
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• 2003.07a
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• pp.201-203
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• 2003

This paper presents a simple electronic stater for single phase induction motor(SPIM). To obtain a starting torque, the phase angle of the auxiliary winding is controlled using simple gate trigger control circuit. Because of this electronic stater circuit consists of some passive element and switching device, it is simple and robust. The experimental result shows some good results, and verifies the proposed electronic starter.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1999.11a
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• pp.76-79
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• 1999

This paper describes real power difference continuous and on/off operation of ballast for fluorescent lamps. We tested ballasts for fluorescent lamps, such that glow stater ballast, rapid stating ballast, and electronic ballast. We measured consumed real power. Input voltage is A.C. 220V and ON time 8 is minutes, OFF time 2 is minutes.

• Microbiology and Biotechnology Letters
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• v.22 no.5
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• pp.544-549
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• 1994

Lactobacilli proliferating in fermented sausages of the specific ripening conditions were isolated from fermented sausages, manufactured in the absence of an added starter, during ripening under controlled temperature-humidity conditions. Based on morphological, physiological and bio- chemical characteristics and carbohydrate fermentation of isolated strains, three strains of isolates were identified as Lactobacillus curvatus, two strains as Lactobacillus sake. Optimal temperature and pH for growth of isolated strains were 30$\circ$C and pH 6.0~7.0, respectively. These strains were salt tolerant, multiplying in the presense of 6~8% NaCl.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.10 no.5
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• pp.127-135
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• 2015

The initial start-up founders are also often successful and sometimes unsuccessful. Conditions of establishment, it is necessary to management strategies such as site selection and strong entrepreneurial spirit with matching funds force to their aptitude. However, novice founder, in real estate transactions, there is a case in which a freak accident, such as the double sale occurs. South Korea's real estate transactions practice, difficult subject to systematic support, even as has been resolved legally, the damage of the victim so that the difficult issues that remain intact occurs. Therefore, beyond the problem to punish the perpetrators in such breach of trust crimes a legally double trade to this, is the strategy through the management histological approach received victim now of damage is required. We want to be viewed as discussion of What about the management strategy for accident prevention of real estate transactions in elementary founder accident concerning transactions such as real estate of double trafficking.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.753-755
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• 2002

This paper presents the characteristic analysis by changing the shape and position of auxiliary pole core for Automotive stater motor. The brush contact resistance and mechanical loss calculated from the experimental data are used in characteristic analysis. The Finite Element Analysis Method(FEM) and 3D Equivalent Magnet Circuit Network(EMCN) are used for analysis. The validity of the proposed methods are verified by comparison of analysis results and experimental ones.

• 한국전산유체공학회:학술대회논문집
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• 2000.05a
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• pp.78-83
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• 2000

An iterative time marching procedure for solving incompressible internal flow has been applied to the flow around a rotor-stator. This procedure solves three-dimensional incompressible Reynolds-averaged Navier-Stokes equation on a moving, time-deforming, non-orthogonal body-fitted grid using second-order accurate schemes for the time derivatives and third/second-order accurate schemes for the spatial derivatives. To handle rotationg geometry, the multiblock technique is applied and the overall flow domain is subdivided into two blocks. In each block, a grid is generated and flowfield is solved independently of the other blocks. The boundary data for each block is provided by the neighboring blocks using bilinear interpolation technique.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.692-694
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• 1992

This paper describes a robust flux bonging scheme which utilizes the windings of the machine itself to implement field orientation control of SLIM (Single-sided Linear Induction Motor). By subtracting the voltage across adjacent motor coils of the same phase which are named STATOR TAPPED COIL, a flux signal is obtained which is insensible to stater resister drop at a low speed that exerts a bad Influence on field orientation. The method using STATOR TAPPED COIL has been implemented at SLIM in our laboratory, and experimental results are being scrutinized.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1997.04a
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• pp.326-329
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• 1997

The surface of mica/epoxy paper(130${\mu}{\textrm}{m}$) is investigated with SEM(scanning electron microscope). SEM micrographs revealed that thermal aging has a strong influence on aged specimens. The mica/epoxy paper was exposed at 187$^{\circ}C$ in an ordinary electrical oven for 72hour. Stater windings from two generators were measured by tan delta(tan $\delta$)and maximum partial discharge(Qm). The values of tan $\delta$and Qm were fecund to be higher for new generator than old one. The insulation condition of mica/epoxy paper were measured by ac current and tan $\delta$. Test results are observed that the sound specimens are higher than those aged. Model bar coils subjected to various accelerated agings were evaluated by Qm.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.05a
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• pp.418-422
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• 2001

This paper presents a developed squired cage induction motor for axial flow fan. The developed squirrel cage induction noter for axial flow fan is exchanged the position, rotor and stater. In this method a fan blade is attached to outside rotor. So we can protect the motor from rain and reduce noise, and there is no need to have bending duct to locate the fan motor. Carried out experimental test with this induction motor, and the results were as follows. Starting torque was 21kgㆍcm@120V, maximum efficiency was 0.84@120V. The characteristics of tests were the same as double squirrel-cage type IM.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.28 no.12
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• pp.1501-1510
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• 2004

The pumping characteristics of a single-stage disk-type drag pump (DTDP) are calculated for the variation of the vertical clearance between a rotor and stator by the three-dimensional direct simulation Monte Carlo (DSMC) method. The gas flow mainly belongs to the molecular transition flow region. Spiral channels of a DTDP are cut on the both the upper and lower sides of a rotating disk, but a stationary disk is planar. The interaction between molecules is described by the variable hard-sphere model. The no time counter method is used as a collision sampling technique. The vertical clearance has a significant effect on the pumping performance. Experiments are performed under the outlet pressure range of 0.4∼533 Pa. When the numerical results are compared with the experimental data, the numerical results agree well quantitatively