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다양한 각도의 곡관 내에서 아이스슬러리의 유동에 따른 영향
김규목,박기원,권일욱 대한설비공학회 2004 설비공학 논문집 Vol.16 No.2
Recently, the government introduced the thermal storage system for reducing the electric power load. Especially, the ice slurry type has gained lots of interest due to its good heat transfer and flowing characteristics.This study was performed to understand the effects of transporting ice slurry through elbows of various angle. Propylene glycol water solution was used and about 2 mm ice particles were circulated. The experiments were carried out under various conditions, such as concentration and velocity of water solution ranging between 0∼20 wt%, 1.5∼2.5 m/s, respectively. And elbows with 4 different angles of 30 , 45 , 90 , 180 . The differential pressure and IPF (ice packing factor) between the pipe entry and exit were measured.The tendency of pressure loss and outlet IPF in elbow is that the pressure loss was reduced as concentration and flow velocity of water solution is increased, and low value appeared at 10 wt% and 2.5 m/s. The variation of outlet IPF was compared with the inlet IPF in the range of ±20%.
사용자 입력 기반의 전경 추출 영상 분할 알고리즘 분석
김규목 ( Kyumok Kim ),이존하 ( Jon-ha Lee ),박지열 ( Ji Yeol Park ),박진원 ( Jinwon Park ),정승원 ( Seung-won Jung ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.1
본 논문에서는 컴퓨터 비전 기술에서 중요하게 인식되고 있는 영상 분할 기법에 대해 분석한다. 사용자가 입력하는 표시 (Seed) 정보를 이용하여 영상에서 중요한 객체를 추출하는 대표적인 알고리즘의 접근방식 및 차이점을 비교한다.
김규목 ( Kyumok Kim And ),정승원 ( Seung-won Jung ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.2
본 논문에서는 웹캠을 이용하여 사용자가 추출하고자 하는 객체를 영상으로부터 추출하는 시스템을 제안한다. 영상의 중심에 위치한 Super-pixel 을 표시 (Seed) 정보로 이용하여 영상에서 중심에 위치하고 있는 객체를 추출하는 방식을 제시한다.
다양한 각도로 기울어진 직관내에서아이스슬러리 유동시 압력손실과 IPF 변화
박기원,김규목 대한설비공학회 2004 설비공학 논문집 Vol.16 No.11
Recently, the ice storage system using ice slurry has been used increasingly since it has been introduced where the rapid cooling load change is required. Because it overcomes a decrease of the melting performance and an increase of the thermal resistance on the ice layer in static ice thermal storage system.This study is performed to understand the effects of transporting ice slurry through horizontal, vertical and inclined tubes (30 , 45 ). It used propylene glycol-water solution and ice particles (diameter of about 2 mm) in this experiment. The experiments were carried out under various conditions, with concentration of water solution ranging from 0 to 20 wt%, and velocity of water solution at the entry ranging from 1.5 to 2.5 m/s.The results were as follows: Regarding the angle of inclined tube, the highest pressure loss was measured for vertical tube and the pressure loss for 45 , 30 , horizontal straight tubes were lower successively. The lowest pressure loss in these tubes was measured at velocity of 2.0∼2.5 m/s and concentration of 10 wt%. The outlet IPF was likewise stable in these ranges.
곡관과 연속된 경사관 내에서 유동하는 아이스슬러리의 압력손실에 미치는 유속의 영향
박기원,김규목 대한설비공학회 2005 설비공학 논문집 Vol.17 No.7
This study experimented to understand the effects of transporting ice slurry through elbow and inclined tube. And at this experiment it used propylene glycol-water solution and a diameter of about 2 mm ice particle. The experiments were carried out under various conditions, with velocity of water solution at the entry ranging from 1.0 to 3.5 m/s and elbows and inclined tubes of 4 kinds angle with 30 , 45 , 90 and 180 . The pressure drop between the tube entry and exit were measured.According to angle of bending, the highest pressure drop was measured at 30 elbow and the lowest pressure drop was measured at 90 elbow, and there are only a little differences of pressure drop between 45 elbow and 180 elbow. According to angle of inclined tube, the highest pressure drop was measured at 90 inclined tube and the pressure drop at 45 , 30 , 180 inclined tubes were lower successively. The lowest pressure drop in elbows and inclined tubes was measured at velocity of 2.0∼2.5 m/s and concentration of 10 wt%.