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최형일,이도형,맹주성,Choi, Hyung-Il,Lee, Do-Hyung,Maeng, Joo-Sung 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.11
This article proposes a pressure based method for predicting flows at all speeds. The compressible SIMPLE algorithm is extended to unstructured grid framework. Convection terms are discretized using second-order scheme with deferred correction approach. Diffusion term discretization is based on structured grid analogy that can be easily adopted to hybrid unstructured grid solver. This method also uses node centered scheme with edge based data structure for memory and computing time efficiency of arbitrary grid types. Both incompressible and compressible benchmark problems are solved using the above methodology. The demonstration of this method is extended to slip flow problem that has low Reynolds number but compressibility effect. It is shown that the proposed method can improve efficiency in memory usage and computing time without losing any accuracy.
최형일 ( Hyung Il Choi ),정경훈 ( Kyung Hoon Cheong ),채희정 ( Hee Jeoung Chae ),김연풍 ( Youn Poong Kim ),조도호 ( Do Ho Jo ),설동화 ( Dong Hwa Seol ),김정애 ( Jeung Ae Kim ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.1
The conclusions of this study are summarized below: First, as a result of the evaluation of the mobility of the sorting and separating devices that are moved to and operated at the sites where construction waste is generated, very satisfactory results, namely about 2 days (13. 15 hr) to finish sorting and separating construction waste, were drawn. Second, 142.1 tons per hour were sorted and separated (treatment ability) on average. In terms of volume, about 32.6% of the treatment ability was higher than the suggested 80 ㎥/hr, at 106.1 ㎥/hr. Third, as a result of a grain test conducted on the 10~25 mm of recycled aggregates produced after injecting a good quality of sorted and separated waste concrete into the existing crushing and pulverizing process it was found that about 76.3% of the recycled aggregates remained in the 10 mm grains. For the absorption rate, 6.42% in the grains of less than 10 mm. 3.93% in the 10~25 mm grains, and 6.12% in the 25~40 mm grains were demonstrated. The moisture content was about 8.8% in the less than 10 mm grains, 4.74% in the 10~25 mm grains, and 6.11 % in the 25~40 mm grains. Fourth, in the case of operating sorting and separating devices for the on-site recycling of construction wastes, the noise level was found to be about 44.5~76.0 dB (A) around the target facilities and about 54.8~79.4 dB (A) within the working radius after measuring the levels of noise, vibration and dispersed dust, in view of the effort to minimize disputes and civil petitions deriving from noise, vibration and dispersed dust. The concentration of dispersed dust generated - when simultaneously operating the sorting process of the forward treatment for construction wastes and the production process for recycled aggregates - was about 0.089~0.707 mg/㎥ in the area around the facilities and was about 0.158~0.335 mg/㎥ at the site boundary. These levels actually met the permitted dust exposure level of 2~10 mg/㎥ of the first type to the third type of dispersed dust in relation to the working environment.
최형도(Hyung-Do Choi),전수빈(Soo-bin Jeon),조영태(Young-Tae Joe),정인범(In-Bum Jung) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.2B
기존 교차로 신호제어 알고리즘에는 대형차량 및 보행자를 모두 고려한 알고리즘 연구가 미흡했다. 불규칙함과 성능저하의 문제로 이 두 가지 사항을 고려하지 않고 알고리즘을 설계한 경우가 많았다. 본 논문에서는 이런 문제를 해결하고자 대형차량과 보행자를 고려하여 기존의 알고리즘들이 고려하지 못한 부분을 보완하고 보다 나은 효율성을 가지는 알고리즘을 구현하고자 한다.