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김상렬,김현실,김재승,김봉기,이성현,Kim, Sang-Ryul,kim, Hyun-Sil,Kim, Jae-Seung,Kim, Bong-Ki,Lee, Sung-Hyun 한국음향학회 2010 韓國音響學會誌 Vol.29 No.8
본 논문은 여객선용 HVAC 시스템 목업을 구축하여 HVAC 요소의 성능평가를 수행한 결과를 다루었다. 측정은 룸 유니트 (Room Unit), 소음기 등 6가지 종류에 대해 이루어졌으며 여러 유량에 대해 삽입손실을 측정하였다. 소음기 직경이 작고 유량이 클수록 유동소음이 커져서 소음저감효과를 방해하지만, 직경이 커질수록 유동소음의 효과는 작아지고 삽입손실은 최대 25 dB까지 나타남을 확인하였다. 디퓨저 형태의 룸 유니트는 대체로 삽입손실이 0 - 10 dB 이지만 노즐 형태는 삽입손실이 최대 -15 dB 까지 소음이 커질 수 있음을 확인하였다. 또한 덕트 배열에 따라 최대 2 dB 까지 실내소음이 차이날 수 있음을 보였으며 각 룸 유니트에 동일한 유량이 배출하도록 조절하는 것이 보다 낮은 소음레벨을 얻을 수 있음을 확인하였다. In this paper, evaluation of noise reduction performance of HVAC system for ships by means of HVAC mock-up system is presented. Test is done for six different types of HVAC elements including room unit, silencer, etc. It is found that when diameter of silencer is small and air flow is large, flow noise degrades insertion loss. However, as diameter of silencer becomes larger, the effect of flow noise becomes smaller, and insertion loss up to 25 dB is measured. It is observed that insertion loss of diffuser type room unit is usually between zero and 10 dB, whereas that of the nozzle type room unit can be down to - 15 dB. In addition, it is shown that changing duct arrangement can reduce cabin noise by up to 2 dB, and providing same air flow to each room unit is crucial for generating less noise.
백서에서 인간 탈회동결건조골 수화시간에 따른 초기 골치유
김상렬(Sang-Ryul Kim),김수관(Su-Gwan Kim),장현선(Hyun-Seon Jang),조세인(Se-In Cho) 대한구강악안면외과학회 2002 대한구강악안면외과학회지 Vol.28 No.3
The purpose of this investigation was to evaluate the relationship between the hydration time of demineralized freeze-dried bone(DFDB) and early new bone formation in rat calvarial defects filled with DFDB. Rats (n = 43) were divided into 4 experimental groups. Standard, transosseous circular defects of the calvaria were made midparietally. In experimental group 1, the defect was grafted immediately after soaking the DFDB. In experimental group 2, the defects were grafted with DFDB after soaking the DFDB for 10 minutes. In experimental groups 3 and 4, the defects were filled after soaking the DFDB for 30 and 60 minutes, respectively. Graft sites were analyzed histologically after healing periods of 1, 2, or 4 weeks. Each group showed similar bone regeneration at each time point by histological analysis. The results of this study were as follows: 1. After 1 week, a significant amount of inflammation, granulation tissue, and edema were found. A small amount of bone was seen, but the amount of bone did not differ between groups. 2. After 2 weeks, a small amount of new bone formation and DFDB resorption were observed. 3. After 4 weeks, a greater amount of new bone formation was observed. The greatest amount of bone formation occurred in experimental group 4 after 4 weeks. We conclude that the hydration time of DFDB does not affect new bone formation and that it is very important to control inflammation in bone grafting.
김상렬(Kim, Sang-Ryul),김현실(Kim, Hyun-Sil),이성현(Lee, Sung-Hyun),박근효(Park, Keun-Hyo) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.5
In this paper, the acoustic performance of a shipboard large-sized room unit is studied. The room unit is a kind of rectangular absorptive chamber with a partition whose surface absorptive material with fabric skin is attached to. The room unit has one inlet and three outlets. At the inlet, a plane damper is installed to control the flow rate. The acoustic performance of a prototype room unit is measured using a HVAC mock-up. It is shown that its insertion loss is comparable with that of a commercially-used room unit but the developed room unit generates flow noise higher than the other one. The major source of flow noise is analyzed by NADS-R, the noise analysis program for room unit. Cone-shaped dampers are proposed to be used as the damper of a room unit to reduce flow noise. It is shown that the cone-shaped damper decrease flow noise remarkably.
김상렬(Kim, Sang-Ryul),이종원(Lee, Jong-Won),김봉기(Kim, Bong-Ki),이준신(Lee, Jun-Shin) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.7
A damage estimation method for support structure of offshore wind turbine using modal parameters is presented for effective structural health monitoring. Natural frequencies and mode shapes for a support structure with monopile of an offshore wind turbine were calculated considering soil condition and added mass. A neural network was learned based on training patterns generated by the changes of natural frequency and mode shape due to various damages. Natural frequencies and mode shapes for 10 prospective damage cases were input to the trained neural network for damage estimation. The identified damage locations and severities agreed reasonably well with the accurate damages. Multi-damage cases could also be successfully estimated. Enhancement of estimation result using another parameters as input to neural network will be carried out by further study. Proposed method could be applied to other type of support structure of offshore wind turbine for structural health monitoring.