• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권12호
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• pp.3118-3134
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• 2013

This paper deliberates for a multimedia transmission scheme combining multiple description coding (MDC) and network coding (NC). Our goal is to take advantage from the property of MDC to provide quantized and compressed independent and identically distributed (iid) descriptions and also from the benefit of network coding, which uses network resources efficiently to recover lost data in the network. Recently, p-cycle NC has been introduced to recover and protect any lost or distorted descriptions at the receiver part exactly without need of retransmission. So far, MDC have not been explored using this type of NC. Compressed and coded descriptions are transmitted through the network where p-cycle NC is applied. P-cycle based algorithm is proposed for single and multiple descriptions lost. Results show that in the fixed bit rate, the PSNR (Peak Signal to Noise Ratio) of our reconstructed image and also subjective evaluation is improved significantly compared to previous work which is averaging method joint with MDC in order to conceal lost descriptions.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권11호
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• pp.4483-4501
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• 2015

In this paper, we investigate a security transmission scheme at the physical layer for cooperative wireless relay networks in the presence of a passive eavesdropper. While the security scheme has been previously investigated with perfect channel state information(CSI) in the presence of a passive eavesdropper, this paper focuses on researching the robust cooperative relay beamforming mechanism for wireless relay networks which makes use of artificial noise (AN) to confuse the eavesdropper and increase its uncertainty about the source message. The transmit power used for AN is maximized to degrade the signal-to-interference-plus-noise-ratio (SINR) level at the eavesdropper, while satisfying the individual power constraint of each relay node and worst-case SINR constraint at the desired receiver under a bounded spherical region for the norm of the CSI error vector from the relays to the destination. Cooperative beamforming weight vector in the security scheme can be obtained by using S-Procedure and rank relaxation techniques. The benefit of the proposed scheme is showed in simulation results.

• 한국자동차공학회논문집
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• 제13권1호
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• pp.90-98
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• 2005

HMT is a type of continuously variable transmission which has split power flow path characteristics with gear train and hydro static unit. The benefit of improved fuel economy and high power capacity enables it to be a promising application fur large vehicles. This paper presents the analysis results including velocity, static torque, transmission efficiency and dynamic model of the HMT that is developed for city buses. The speeds or gear shafts, the static clutch torque and split power ratio for each mode are detailed here. From the analysis of HMT transmission efficiency considering the power loss in meshed gear and hydraulic unit, we can conclude that minimization of hydraulic power is necessary for improved fuel economy design. Also, the dynamic simulation result for mode shift characteristics shows that little shift shock is observed because of the synchronized rotation speed in clutch.

• Journal of Dairy Science and Biotechnology
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• 제26권2호
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• pp.39-43
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• 2008

EMC는 치즈와 유사한 효소작용은 거치게 되지만 치즈에 비하여 더 많은 효소작용에 의하여 더욱 강력한 풍미를 생산하게 된다. 이러한 우수한 EMC의 개발을 위하여 적합한 효소를 찾아내는 것은 중요한 과제이다. 심지어 동일한 PGE도 송아지의 것이 어린 염소나 어린 양의 것에 비하여 더 부드러운 맛을 생산할 수 있다. 특히 체다치즈의 풍미를 위하여는 미생물효소보다 동물성 esterase나 peptides가 유리한 것으로 알려지고 있으며, 체다치즈나 스위스치즈의 경우 비단 백태 질소화합물의 양도 EMC가 치즈에 비하여 3배 가까이 많았다. 체다 EMC의 성분 비율에서도 유리지방산에는 butyric acid, myristic acid, palmitic acid와 oleic acid가 많았고, 유리 아미노산에는 glutamic acid, valine, leucine과 lysine이 많은 것으로 나타났다.

• 한국정보과학회논문지:시스템및이론
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• 제33권8호
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• pp.486-494
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• 2006

본 논문에서는 병렬처리에서 중요한 이슈인 부하균형 문제에 대한 새로운 솔루션을 소개한다. 솔루션으로 제안하는 MGA 기법은 평균장 어닐링 (MFA)과 유전자 알고리즘 (GA)의 장점을 효과적으로 결합한 휴리스틱 부하균형기법이다. 제안된 MGA을 다른 매핑 알고리즘 (MFA, GA-l, GA-2) 들과의 성능 향상비를 측정하는 멀티프로세서 매핑 시뮬레이션을 개발하였다. 휴리스틱 매핑 기법의 합성을 통하여 기존의 방법보다 수행시간은 오래 걸리는 대신 솔루션 품질, 즉 최대종료시간 및 통신부하에서 개선된 실험 결과를 얻을 수 있다는 것을 보였다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 춘계 학술논문 발표대회
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• pp.45-46
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• 2016

As the demand for super tall buildings is currently increased in domestic and foreign countries, some kinds of ultra-high strength concretes are being developed actively. Since the cross section of concrete becomes smaller thanks to such kinds of ultra-high strength concretes, the concrete structures can be much bigger, more gigantic and much ultra-high. And as another benefit which is generated thanks to the enhancement of the durability performance, the maintenance expenses are also saved. However, since low W/B ultra-high concrete has a high possibility that many cracks can occur in the initial period due to the self-shrinkage caused by the self-desiccation as one of the blending characteristics, the problem becomes bigger by influencing the safety of a structure. Therefore, in this study, it is intended to analyze the effects of substituting some limestone-based ultra-high strength mortar with electric arc furnace oxidizing slag fine aggregates on the self-shrinkage of mortar.

• 설비공학논문집
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• 제11권3호
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• pp.301-312
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• 1999

Experiments were carried out to evaluate performance of the cold air distribution systems with an ice storage tank in test room. Cold air distribution systems provide primary air for comfort conditioning or process cooling at coil discharge temperatures$4^{\circ}C$ to$11^{\circ}C$. The application of a cold air distribution system allows for the downsizing of air distribution equipment and central plant equipment when ice storage tank is used. The benefit of a cold air distribution system include a decrease in the floor-to-floor height, increase floor space, reduced building capital costs, reduced energy use and demand. The use of cold air distribution can result in the most cost effective system and is currently being implemented world wise as the new standard in air conditioning systems. In this study, the cold air distribution system is compared with the general ice storage system. Under the same cooling load conditions, experimental results show that the supply air volume of cold air distribution system decrease 38%, and decrease 45% flow rate of brine for the general ice storage system.

• 대한전자공학회논문지SD
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• 제40권7호
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• pp.481-485
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• 2003

25㎛ 두께의 폴리이미드 박핀 기판을 glass 기판에 부착하여 최대 온도 150℃에서 비정질 실리콘 TFT를 제작하였다. 본 논문은 plastic 기판 위에 TFT가 제작되는 공정 절차를 요약하고 glass 위에 제작된 TFT와 ON/OFF 전달특성과 전계효과 이동도를 서로 비교해 보았다. a-SiN:H 코팅층은 plastic 기판의 표면 거칠기를 감소시키는 중요한 역할을 하여 TFT의 누설전류를 감소시키고 전계효과 이동도를 증가시켰다. 따라서 a-SiN:H 코팅층을 이용하여 plastic 기판에 양철의 TFT를 제작하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.407-426
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• 2008

The bentonite slurry has been used as the stabilize suspension for wet process bored pile construction in Thailand. The bentonite suspension has benefit on filtration in the sand layer, but it creates thick cake film along pile shaft and loose sedimentation at pile toe. The base grouting technique was widely used to rectify the soft base or loose sedimentation problem of bored pile. The base grouting technique was not increased only end bearing capacity, but was also more increase in skin friction capacity of the bored piles. The comprehensive researches on base grouting was carried out by installing PVC casing inside the shaft to allow the drilling through the pile base in order to collect the soil sample below the pile tip. The polymer based slurry recently was used to replace the bentonite slurry to overcome the thick cake film along pile shaft as well as loose sedimentation at pile toe. The extent research on polymer slurry by physical model was performed to verify the real behavior of polymer. The appropriate mixing ratio of polymer was proposed. The design skin friction coefficient, $\beta$ and end bearing coefficient, Nq, for sand layer base on fully instrumented tested pile were proposed. The application on remedial of the lose capacity bored pile with large displacement in Bangladesh was proposed and discussed.

• 복식
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• 제59권8호
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• pp.110-122
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• 2009

The objective of this study is to suggest a direction eco-friendly material based fashion products may pursue in the 21 st century in order to protect our environment. This is done by considering the knowledge of the products by housewives, the main consuming players in a household. 398 copies of the survey were collected amongst Korean and Japanese housewives in the 30s and 40s aged group sample and analysed using SPSS 12.0 statistic program. The analysis results are as follows. First, base material was highly knew by Koreans in contradiction with Japanese who were highly knowing the disposal process in regard to eco-friendly fashion products. Second, a higher ratio of Koreans tended to purchase the product with consideration of health issues, however quality of the material was considered more by Japanese buyers. Finally, the result showed that eco-friendly products buyers from both countries had more willingness to purchase eco-friendly material based fashion products than non-buyers in the future. Korean housewives showed more interest in environment, benefit to health and value from eco-friendly material based fashion products than Japanese. Koreans had a better understanding of information and knowledge of the product, as well as higher future purchase intention however, Koreans considered less durability, design and variety of products.