• 한국재료학회지
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• 제15권9호
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• pp.613-619
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• 2005

The ever increasing popularity and acceptance in the market place of portable systems, such as cell phones, PDA, notebook PC, etc., are fueling effects in further miniaturizing and lowering power consumption in these systems. The dynamic power consumption due to the CPU activities and the static power consumption due to leakage currents are two major sources of power consumption. Smaller devices and a lower de voltage lead to reducing the power requirement, while better insulation and isolation of devices lead to reducing leakage currents. All these can be harnessed in the SOI (silicon-on-insulator) technology. In this study, the key aspects of the SOI technology, mainly device electrical properties and device processing steps, are briefly reviewed. The interesting materials issues, such as SOI structure formation and SOI wafer fabrication methods, are then surveyed. In particular, the recent technological innovations in two major SOI wafer fabrication methods, namely wafer bonding and SIMOX, are explored and compared in depth. The results of the study are nixed in that, although the quality of the SOI structures has shown great improvements, the processing steps are still found to be too complex. Between the two methods, no clear winner has yet emerged in terms of the product quality and cost considerations.

• Journal of Power Electronics
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• 제10권3호
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• pp.293-299
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• 2010

In this paper, a single-phase PFC (Power Factor Correction) dual boost converter based on input voltage estimation is studied for DC inverter air conditioner. It is focused on improving input power factor and power quality to satisfy the recent harmonic current regulation standards. Furthermore the input voltage estimation is introduced for price competitive products. A low cost and reasonable control system is implemented using a specified high-speed 32-bit microprocessor. Their effectiveness are verified through theoretical analysis and experiments.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 2010년도 춘계학술대회
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• pp.62-66
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• 2010

Company which produce the latest plastic products of survival dimension for competitive power security productivity elevation activity hard do. But enterprises is lacking value elevation activity that customer among product special quality is thinking heftily and isn't grasping well adjusted impact factors. So, addition quality failure cost is produced. In this research, investigated impact factor and factors influencing most heftily in quality for productivity elevation. As a result, present example that serve to control well importance benevolence.

• 비파괴검사학회지
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• 제31권4호
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• pp.391-397
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• 2011

용접부에 대한 품질 확보를 위하여 방사선투과시험을 실시하고 있으나 기존의 방사선투과시험은 필름을 사용한 아날로그 방법을 적용하고 있는데 비용과 시간이 많이 소요되고 시험 공정이 복잡하여 개선이 요구되고 있다. 본 연구에서는 용접부에 대한 디지털 방사선투과영상과 아날로그 방사선투과영상의 상질을 비교한 결과, 디지털 방사선투과영상은 디지털 영상 개선 과정으로 인하여 필름 영상에 비해 보다 세밀한 관찰을 할 수 있었다. 따라서 디지털 방사선투과시험이 개선이 요구되고 있는 기존 필름에 의한 방사선투과시험을 대체할 수 있을 것으로 평가된다.

• Journal of Electrical Engineering and Technology
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• 제3권2호
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• pp.152-161
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• 2008

This paper deals with a new wave shaping technique for cost effective harmonic mitigation in ac-dc converter feeding Vector Controlled Induction Motor Drives(VCIMD's) for improving power quality at the point of common coupling(PCC). The proposed harmonic mitigator consists of a polygon connected autotransformer based twelve-pulse ac-dc converter and a small rating passive shunt filter tuned for $11^{th}$ harmonic frequency. This ac-dc converter eliminates the most dominant $5^{th},\;7^{th},\;and\;11^{th}$ harmonics and imposes the reduction of other higher order harmonics from the ac main current, thereby improving the power quality at ac mains. The design of autotransformer is carried out for the proposed ac-dc converter to make it suitable for retrofit applications, where presently a 6-pulse ac-dc converter is used. The effect of load variation on VCIMD is also studied to demonstrate the effectiveness of the proposed ac-dc converter in a wide operating range of the drive. Experimental results obtained on the developed laboratory prototype of the proposed harmonic mitigator are used to validate the model and design of the ac-dc converter.

• 한국인터넷방송통신학회논문지
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• 제24권3호
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• pp.55-61
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• 2024

P2P와 클라우드 컴퓨팅의 기술적 장점이 결합된 하이브리드 구조에서는 효율적인 자원의 공급과 부하의 배분이 가능하다. 즉 P2P를 구성하는 플레이어들의 처리 능력과 클라우드 컴퓨팅 환경에 있는 서버의 처리 능력을 적절하게 활용함으로써 경제적 비용과 서비스 품질의 규모를 고려하는 MMOG를 구성할 수 있다. 실제로 클라우드에 존재하는 서버의 컴퓨팅 능력과 통신 대역폭은 중요한 요구형 자원이며 임차를 많이 할수록 비용이 증가하는 대신 서비스 품질은 향상된다. 반면 플레이어의 처리 능력을 많이 활용하면 서비스 품질은 상대적으로 저하되는 대신 경제적 비용은 감소하게 된다. 본 논문에서는 이러한 하이브리드 구조 기반의 MMOG를 위한 서버와 플레이어들 간의 대역폭 조정 기법이 기술된다. 동시에 실행되는 플레이어들의 수가 증가할 때 플레이어들의 요청 행위를 서버와 플레이어들에게 적절히 분배하여 서버의 컴퓨팅 능력과 통신량을 효과적으로 활용하는 기법이 본 논문에서 기술된다. 시뮬레이션 결과 클라우드와 P2P 하이브리드 구조에 기반한 MMORPG에서 플레이어들이 직접 처리하는 대역폭이 증가할수록 서버의 대역폭이 비례하여 감소되는 결과가 나타났다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2007년도 정기학술발표대회 논문집
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• pp.213-218
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• 2007

최근 FTA체결 등 세계건설 시장의 개방으로 인한 국내외적인 주변 건설환경의 급속한 변화속에서 국제경쟁력을 갖추기 위해서는 건설업체의 품질향상을 위한 품질 및 조직관리가 중요하게 대두되고 있다. 그러므로 이에 대한 실태분석을 통하여 개선방안을 마련, 양질의 건축물을 소비자에게 제공함으로써 고객만족을 이룩할 수 있는 품질 및 조직관리 측면에서 연구가 필요하여 실시한 것이다. 품질관리를 위한 전담부서의 조직은 중소건설업체가 크게 미비함으로 인하여 전담부서가 절실히 필요한것으로 나타나 이를 개선하기 위하여 AHP분석을 통한 CEO 직속의 품질전담부서의 조직구조형태가 유지관리측면에서 비용절감효과 등 품질과 조직의 운영이 뛰어난 효과를 가져올 수 있는 것으로 분석되어, 중소건설업체에 품질전담부서를 조직하여 품질개선과 함께 경쟁력 우위를 점해야 할 것으로 사료되어 실시하였다.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2003년도 International Symposium
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• pp.109-119
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• 2003

o In order to start SIP Project .Marketing (& ASIC team) should present biz planning, schedule, device/SIP specs., in SIP TFT prior to request SIP development for package development project. .In order to prevent (PCB) revision, test, burn-in, & quality strategy should be fixed by SIP TFT (PE/Test, QA) prior to request for PKG development. .Target product price/cost, package/ test cost should be delivered and reviewed. o Minimum Information for PCB Design, Package Size, and Cost .(Required) package form factor: size, height, type (BGA, QFP), Pin count/pitch .(Estimated) each die size including scribe lane .(Estimated) pad inform. : count, pitch, configuration(in-line/staggered), (open) size .(Estimated) each device (I/O & Core) power (especially for DRAM embedded SIP) .SIP Block diagram, and net-list using excel sheet format o Why is the initial evaluation important\ulcorner .The higher logic power resulted in spec. over of DRAM Tjmax. This caused business drop longrightarrow Thermal simulation of some SIP product is essential in the beginning stage of SIP business planning (or design) stage. (i.e., DRAM embedded SIP) .When SIP is developed using discrete packages, the I/O driver Capa. of each device may be so high for SIP. Since I/O driver capa. was optimized to discrete package and set board environment, this resulted in severe noise problem in SIP. longrightarrow In this case, the electrical performance of product (including PKG) should have been considered (simulated) in the beginning stage of business planning (or design).

• Journal of Electrical Engineering and Technology
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• 제13권3호
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• pp.1346-1354
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• 2018

Quality of the power system depends upon the reliability of its components such as transformer, transmission lines, insulators, circuit breakers and isolators. The transient voltage due to internal or external reasons may affect the insulation level of the components. The insulation level of these components must be tested against these conditions. Different studies, testing of different electrical components against high voltage impulses and different industrial applications rely on the international manufactures for pulsed power generation and testing, that is quite expensive and large in size. In this paper a model of impulse voltage generator with capacitive load of pin type insulator is studied by simulation method and by an experimental setup. A ten stage high voltage impulse generator (HVIG) is designed and implemented for different applications. In this proposed model, the cost has been reduced by using small and cheap capacitors as an alternative for large and expensive ones while achieving the same effectiveness. Effect of the distributed capacitance in each stage is analyzed to prove the effectiveness of the model. Different values of front and tail resistances have been used to get IEC standard waveforms. Results reveal the effectiveness at reduced cost of the proposed model.

• 기술혁신학회지
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• 제5권2호
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• pp.245-256
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• 2002

Measurement standards, as being widely recognized, is necessary for national economic development and advanced industrialization. Also measurement standards give reliability and fair trade to the producers and consumers. Macro-effect of measurement standards using estimation of cost function has four effects: 1) value-added causing effect, 2) effect of employment, 3) reduction effect transaction cost, 4) reduction effect defect rates. In this study, to investigate the impacts between specific and the other industries, we used I-O Table of Korea Bank. The relation between the value-added produced by original production factors and final use is determined through production level, and the relation can be investigated with production causing coefficient matrix. In this study, it was showed that the measurement standards investments including measurement only man power of industries were increased from 1995 rapidly. The establishment and maintenance of measurement standards contributes to reduce the defect rate of products in production process and improve the confidence of the product quality. The results from this study show that measurement technology contributes to improve quality, decrease defect rate, improve production process, develope new products, reduce prime cost and increase the consumer's confidence on the firms. Since these results indicate that measurement standards are very important in the point of their vast contribution, we hope our findings can contribute to encourage measurement activities in industries.