• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1480-1481
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• 2008

In this paper, we present surface treatments for achieving bonds between PMMA and PDMS substrates. Silane primer is used for the formation of hydroxyl group on PMMA surfaces. The formed hydroxyl groups enhance the bonding strength of PDMS-PMMA substrates without channel clogging and structure deformation. The bonding strength on the different surface treatments (include oxygen plasma, 3-APTES, and corona discharge) is evaluated to find optimal bonding condition. The maximum bonding strength at the optimal surface treatment is over 300 kPa. The surface treatment using silane primer can be used to the bonding process of Micro-TAS and Lab-on-a-Chip.

• 한국전산유체공학회:학술대회논문집
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• 2011.05a
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• pp.100-103
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• 2011

In the present work, a numerical study of fluid flow and heat transfer on the concave surface with impinging jet has been performed by solving three-dimensional Reynods-averaged Naver-Stokes(RANS) equations. The constant temperature condition was applied to the concave impingement surface. The inclination angle of jet nozzle and the distance between jet nozzles are chosen as design variables under equivalent mass flow rate of working fluid into cooling channel, and area averaged Nusselt number on concave impingement surface is set as the objective function. Thirteen training points are obtained by Latin Hypercube sampling method, and the PEA model is constructed by using the objective function values at the trainging points. And, the sequential quadratic programming is used to search for the optimal paint from the PBA model. Through the optimization, the optimal shape shows improved heat transfer rate as compared to the reference geometry.

• Journal of the Korean Society of Costume
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• v.22
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• pp.177-192
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• 1994

The purpose of this study lies in giving help to the rational life of clothing of costmer and presenting some measures for solving problems of the fashion merchandising policy of children's ready-made clothes and the searching of feasibility of the children's ready-made clothes market in the wave of market liberalization. data for this study were obtained from interviews with managers in children's apparel company. The results are as follows : the most important change of children's ready-made clothes market is the increase in national brand license brand direct import brand and the variety of the channel of distri-bution. The most children's apparel companies showed double-edged viewpoints for these tendencies in the wave of market libera-lization. In therms of positive aspect it would give stimulus to improve product quality of fashion merchandise which were the most dis-advantageous factors in competing with oversea's brand. In terms of negative aspect it would bring the oversupply and the foreign product's penetration in domestic market. In order to improve the present condition the companies should try to establish strat-government should try to support to the small and medium sized apparel firms.

• Proceedings of the KSME Conference
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• 2000.04b
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• pp.205-212
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• 2000

Induction motors. having axial cooling channels in stator and rotor are designed for better cooling performance. Traction motors are one of those examples. And, thermal analysis gain more attention with the Increased demand of the motors, for reliable operation and life prolongation. was Induced to effective thermal conductivity through modeling. Through. fundamental comparison experiment, heat source experiment and transient state experiment, the induction motor using inverter was examined to produce heat source with frequency level and traced to thermal variation at starting and stopping. And thermal analysis using thermal network was compared with a transient state experiment.

• Proceedings of the KSME Conference
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• 2003.11a
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• pp.1384-1387
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• 2003

Pressurization test is usually required in aircraft full-scale static test. There are several test conditions including pressurization of cockpit, fuselage fuel tank, air inlet duct for T-50 full-scale static test. In this paper, the test conditions, equipment, piping analysis for the pressurization test are introduced. Tank simulation test is performed to verify the validity of piping analysis and to find good tuning parameters for the pressurization channel in the servo controller. Several test setup for pressurization of T-50 test is introduced. Test article volume is filled by form, $60%{\sim}80%$ volume is reduced for the T-50 full-scale static test. Pressurization system is connected to servo controller which also controls hydraulic actuator. Load and pressure control is synchronized by using the same servo controller during T-50 test. Typical control result for pressurization test condition is shown. Pressurization tests of T-50 full-scale static test was completed successfully.

• Water for future
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• v.18 no.1
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• pp.67-73
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• 1985

Tidal propagation in the Keum River has been routinely handled by numerical integration of the long fravity wave equation by Dronkers. The dynamic equations include non-linear terms thereby reproducing the shallow water tides. The model was used to compute tidal distribution of the Kum River for aveage spring, mean, neap tidal conditions and further utilised to investigate the waterlevel response within tidal reaches by combined tide and flood discharge effects. The objective of this initial study is to investigate the tidal dynamics of the lower reaches of the Keum River under the condition of before-cross-channel barrage construction.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.1493-1496
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• 2005

연결형 dominating set기반의 라우팅 알고리즘에서 잦은 dominating set의 재구성은 루트 손실로 인한 전송 에러를 발생시키기 때문에, 노드의 잔여 전력량과 이동성을 고려하여 게이트웨이 노드를 선택하여야 한다. 또한 같은 지역에 노드가 집중되어 있다면 매체를 공유하는 무선 네트워크의 특성상 병목으로 인한 충돌 및 지연 등이 야기 될 가능성이 크다. 따라서 본 논문에서는 노드의 잔여 전력량 및 이동성, 이웃 노드수의 가중 가산 값에 비례하여 이웃 구성 통보 메시지 (neighbor set advertisement message)의 브로드캐스팅을 지연시키는 방법을 통해 연결형 dominating set의 재구성을 최소화 하여 신뢰성 있고 효율적인 데이터 전송을 보장하는 새로운 연결형 dominating set 구성 방법을 제안하고 다양한 상황에서의 실험을 통해 그 성능을 비교 평가하였다.

• 한국연소학회:학술대회논문집
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• 2003.12a
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• pp.287-298
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• 2003

A numerical investigation of a catalytically stabilized thermal (CST) combustor was conducted for a multi-channel catalyst bed, and both the catalyst bed and thermal combustor were simultaneously modeled. The numerical model handled the coupling of the surface and gas reaction in the catalyst bed as well as the gas reaction in the thermal combustor. The behavior of the catalyst bed was investigated at a variety of operating conditions, and location of the flame in the CST combustor was investigated via an analysis of the distribution of CO concentration. Through parametric analyses of the flame position, it was possible to derive a criterion to determine whether the flame is present in the catalyst bed or the thermal combustor for a given inlet condition. The results showed that the maximum inlet temperature at which the flame is located in the thermal combustor increased with increasing inlet velocity.

• KSTLE International Journal
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• v.7 no.1
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• pp.22-26
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• 2006

A simple finite element analysis is performed to simulate the thermal characteristics of a micro sensor package with thin film heater embedded in the glass wall of a micro-channel. In this paper, Electric characteristics of ITO sputtered heater were presented in this study, which can be used as a map of heater design in the range of available system temperature. The effects of thermo-physical properties of materials, geometrical structure and boundary condition on the thermal performance are also investigated. Finally, the design of micro-flow induced thermal sensor that is capable of measuring fluid flow with a lower flow detection limit of approximately 24pL/s is presented.

• Journal of Veterinary Clinics
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• v.26 no.2
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• pp.166-169
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• 2009

An 11-year-old male Beagle, weighing 10.5 kg, was presented with sudden bradyarrhthmia and severe hypotension after incidental ingestion of diltiazem. The dog was treated with intravenous(IV) isotonic crystalloid solution, atropine, calcium gluconate, dobutamine, glucagon and gastric lavage under the aid of temporary transcutaneous cardiac pacing. With the short-term use of transcutaneous cardiac pacing and medical treatment, the heart rhythm and the condition of the patient were stabilized.