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崔民鎬 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-
The transfer of heat is an important aspect of every polymer processing operation. The present effort is directed to providing a fundamental and useful treatment of heat transfer in polymeric systems. The effects of viscous heat dissipation and thermal expansion cooling for non-Newtonian fluid were analyzed and compared with the experimental results.
"파이프 內에 있어서 유동 열 연화성 폴리머의 열 전달에 관한 연구"
崔民鎬 弘益大學校 1983 弘大論叢 Vol.15 No.2
Heat transfer to a flowing thermally softened polymer(Polymethyl methacrylate) has been studied. Experimental temperature profiles were determined at various axial lengths. The data are both precise and reproducible. Sizable viscous dissipation was found to occur. This effect was found to be greater for polymethylmethacrylate than a molten polymer(polyethylene). The experimentally determined data were checked qualitatively with the data computed from a prior analytical solution of the equations of motion and energy.
2회전 CORDIC을 이용한 QRD-RLS 알고리듬 구현
최민호,송상섭 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.5C
본 논문에서는 변경된 Given회전을 이용한 QR 분해와 이를 기반으로 하는 RLS 알고리듬의 구현에 대하여 연구하였다. Givens 회전은 CORDIC(Coordinate Rotation Digital Computer) 연산을 반복 수행하여 구한다. QR 분해의 계산 시간을 줄이기 위해 1회의 Givens 회전에 필요한 CORDIC 연산의 반복 회수를 제한하였으며 보정계수를 계산할 때의 제곱근 계산을 없애기 위해 2회전 방법을 사용하였다. In this paper we studied an implementation of QR decomposition-based RLS algorithm using modified Givens rotation method. Givens rotation can be obtained with a sequence of the CORDIC operations. In order to reduce the computing time of QR decomposition we restricted the number of iterations of the CORDIC operation per a Givens rotation and used double-rotation method to remove the square-root in the scaling factor.
崔民鎬 弘益大學校 1984 弘大論叢 Vol.16 No.2
Parametric effects on Critical Heat Flux have been studied. Coupling effects of pressure, mass velocity and Steam quality were studied. The test was conducted in 25 Rod bundle nuclear reactor of Dia 0.415'' and 72'' long. The experiment was conducted with mass velocity of 0.5 ×106lb/hrㆍft²to 2.5 ×106 under the pressure of 1000∼2100 psia. The test data have been in good agreement with the previous empirical correlation.
崔民鎬 弘益大學校 1985 弘大論叢 Vol.17 No.2
Two processes, Bayer and Pcuk, to produce hydrazine hydrate have been compared in economic and technical aspects. Pcuk process is turned out to be more profitable than the Bayer process.
평택지역의 맹꽁이 대체서식지 모니터링 및 기상요인 분석
최민호,배양섭 한국생명과학회 2024 생명과학회지 Vol.34 No.4
본 연구는 평택시 죽백동 일원에 서식하는 맹꽁이를 2019년에 대체서식지로 이주시킨 후 2020–2022년까지 사후모니터링을 통해 대체서식지가 갖춰야 할 최소 조건과 맹꽁이 모니터링의 효율성 제고를 목적으로 진행되었다. 대체서식지의 서식 환경을 분석한 결과 습지, 초지, 하천과의 거리는 5 m 이내, 저층 초지 공간은 6,000 m2 이상, 깊이 20 cm 이상의 부드러운 토질, 임시 습지의 면적은 5,000 m2 이상으로 서식지 적합성 기준에 부합하였으며, 모니터링 과정에서 이주된 개체군의 체장길이 및 몸무게가 유지되는 것을 확인하여(p>0.05) 서식지와 산란지의 근접성, 먹이공간(초지공간) 확보, 토질, 습지의 조건이 갖춰진다면 대체서식지의 기능을 수행할 수 있는 것으로 나타났다. 맹꽁이 개체군에 영향을 주는 기상요인을 분석한 결과, 체장길이는 최저기온, 최고기온, 상대습도, 강수량과 통계적으로 유의미 하였다(p<0.05). 개체수 및 번식의 경우 강수량과 번식에서 유의미한 정(正)의 상관관계가 나타났으며(p<0.01), 개체수는 평균기온, 최저기온, 상대습도에 영향을 받는 것으로 나타났다(p<0.05). This study is conducted to analyze environmental factors that affect the ecology of boreal digging frog and use them as basic data for selecting (or creating) suitability of alternative habitats for survival and monitoring method from 2020 to 2022 after boreal digging frog were relocated to the alternative habitats in 2019. Analyzing the environment of the alternative habitats showed that the criteria suited the followings: distance from wetlands, grasslands and rivers was within 5 m, the low-rise grassland was 6,000 m2, soft soil was at a depth of ≥20 cm, and the area of permanent wetlands was 5,000 m2 wide. As a result of the correlation analysis between meteorological factors and population (n) and breeding, there was a significant correlation between rainfalls and breeding (p<0.01). During the monitoring, it was confirmed that the SVL (Snout-Vent Length) and BM (Body Mass) of the translocated population were maintained (p>0.05), and it was found that the proximity of the habitat and spawning pond, securing food space (grasslands), soil quality, and wetlands could function as an alternative habitat if conditions were met. As a result of analyzing the meteorological factors affecting the population of boreal digging frog, the SVL had a statistical impact on the minimum temperature, maximum temperature, relative humidity, and the rainfall (p<0.05). In the case of breeding, rainfall was found to be affected (p<0.01), and the population was statistically affected by the average temperature, minimum temperature, and relative humidity (p<0.05).