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OFDMA 시스템의 다중 사용자 스케줄링을 위한 순환지연 다이버시티의 지연값 결정
임민중(Min-Joong Rim),허성호(Seong-Ho Hur),송현주(Hyun-joo Song),임대운(Dae-Woon Lim),정병장(Byung-Jang Jeong),노태균(Taegyun Noh) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.3A
OFDMA 시스템에서 주파수축에서의 다중사용자 스케줄링의 성능은 채널의 주파수 선택적 특성과 상관이 있다. 채널이 주파수축에서 평탄하면 다중사용자 스케줄링의 이득이 줄어들 수 있으며 반대로 주파수 선택적 특성이 너무 커서 할당 대역폭 내에서 채널의 변화가 심하게 일어난다면 충분한 스케줄링 이득을 얻기 어려워진다. 다중 사용자 스케줄링 이득을 최대화하기 위해서는 순환지연 다이버시티를 적용하여 채널의 주파수 선택적 특성을 조절할 수 있다. 이 논문에서는 할당 대역폭과 채널 특성을 고려하여 순환지연 다이버시티를 적용할 때의 최적의 지연값을 결정하는 방법을 제안한다. In an OFDMA system the performance of multi-user scheduling in the frequency domain is affected by the frequency selectivity of the channel. If the channel is too flat in the frequency domain, the multi-user scheduling gain might be degraded. On the contrary, if the frequency selectivity is too high and the magnitude of the frequency response severely fluctuates on the allocation bandwidth, it is also hard to get sufficient scheduling gain. For maximizing the multi-user scheduling gain, a cyclic delay diversity technique can be used to adjust the frequency selectivity of the channel. This paper proposes a method to determine the optimal delay value of cyclic delay diversity according to the allocation bandwidth and the channel characteristics.
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Lightweight Design of the Stub Axle Using Topology Optimization
김진수(Jinsu Kim),노홍승(Hong Seong Roh),민연주(Yeonjoo Min),허성호(Sung-Ho Hur),장인권(In Gwun Jang) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.7
This study reviews the assumption that the lightweight design of commercial vehicles is significant from the aspect of the anticipated fuel consumption and environmental regulations that are consequently applicable to those vehicles. Generally speaking, it is noted that among the numerous trailer components, a stub axle, which is designed to independently operate as an integral part of trailer’s suspension, can play an important role in increasing the shipping capacity of a box trailer. For this reason, because each stub axle is comparatively a heavy unit in itself, and a total of six stub axles are mounted in a box trailer, the lightweight design of a stub-axle is noted as an essential factor to reduce the whole weight of a trailer. For a finite element analysis, an original CAD model is modified through removing a chamber, airbag, axle drum, bearing and pivot on a vehicle. In addition, the loading conditions are imposed considering three extreme driving conditions and the effects are studied when in the event of review of a fully loaded in a box trailer. A topology optimization is conducted to determine a lightweight design for minimizing compliance under these boundary conditions.
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김지회,김성준,장동석,이명숙,허성호 한국산업미생물학회 1990 한국미생물·생명공학회지 Vol.18 No.1
우리나라에서 생산되고 있는 패류 중 비교적 PSP의 검출률과 독소함량이 높은 것으로 알려진 진주담치를 시료로 하여 PSP로 인한 식중독사고의 예방과 독화된 패류의 활용방안을 모색하기 위하여 독화된 진주담치의 여러가지 처리조건 즉, 동결과 해동, 가열, 향신료 첨가 등이 독력에 미치는 영향과 통조림 제조공정 중의 독력변화에 관하여 실험한 결과를 요약하면 다음과 같다. 1. PSP는 동결과 해동에 의하여 전혀 영향을 받지 않을 뿐만 아니라 마늘과 생강액즙의 첨가에 의해서도 영향을 받지 않았다. 2. PSP를 가열하였을 때 70℃ 이하에서는 60분간의 가열에 의해서도 거의 독력변화가 없었으나, 80℃이상에서는 온도의 상승에 따라 독력의 감소율도 증가하였다. 3. 독화된 진주담치를 통조림 제조하였을 때 살균공정에서 독력의 감소가 심하여 최초 독력의 90% 이상이 감소하였다. Paralytic Shellfish Poison(PSP) is mainly produced by marine dinoflagellates such as Protogonyaulax sp. and Pyrodinium sp.. The PSP was known to be accumulated in digestive gland of shellfish as result of feeding toxic dinoflagellates. PSP illness occurs when one eats PSP intoxicated shellfish. Therefore PSP is becoming as serious problem in food hygiene and shellfish cultivation industry. The purpose of this study was to develop detoxification method for utilization of PSP intoxicated sea mussel and prevent from PSP illness. The PSP was extracted with 0.1 N HCl solution from the submitted sea mussel, then the toxicity was measured by mouse assay according to Official Methods of Analysis of the Association of Official Analytical Chemists, No detoxification effect was observed by adding extracted juice of garlic and ginger. When the sea mussel homogenate was heated at various temperatures, the PSP toxicity was not changed significantly at below 70℃ for 60 minutes but it was decreased as the heating temperature was increased. For example, when the sea mussel homogenate was heated at 100, 121℃ for 10 minutes, the toxicity was decreased about 67 and 90%, respectively. When the sea mussel containing 645 ㎍ PSP per 100g of edible meat was processed according to general shellfish canning procedure, the toxicity was decreased as the level of PSP undetected by mouse assay.
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