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중대형급 냉수, 스팀 동시 공급형 흡수식 히트펌프 시제품 성능시험 결과 분석
하현호(Hyun Ho Ha),김한길(Han Gil Kim),풍익(Feng Yi),조대한(Dea Han Cho),유인평(In Pyung Yoo),권오경(Oh Kyung Kwon),배경진(Kyung Jin Bae),김남용(Nam Yong Kim),홍성주(Sung Joo Hong),박찬우(Chan Woo Park),김인관(In Gwan Kim) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
The combination of Absorption Heat Pump Type II and Single Effect Absorption Chiller is the Absorption Heat Transformer with simultaneous supply of chilled water and steam. This type of absorption heat transformer can supply steam of 120℃ and chilled water of 8℃ simultaneously by using hot water of 90℃ as heat source. A heat source of the cycle of this absorption heat transformer passes through generator and high temperature generator. The consist formation of the cycle are evaporator to produce chilled water, high temperature absorber to produce high temperature water, low temperature absorber and condenser for heat dissipation; in addition, the control system is structured exclusively for steam and chilled water. A prototype is designed based on ability of supplying 100 usRT of cooling capacity and 200kg/h of steam, and manufactured to execute performance evaluation accordingly.
김희훈,강승효,박재현,하현호,임진수,임동훈,Kim, Hee-Hoon,Kang, Seung-Hyo,Park, Jea-Hyun,Ha, Hyun-Ho,Lim, Jin-Soo,Lim, Dong-Hoon 한국통계학회 2011 응용통계연구 Vol.24 No.6
영상 융합은 특징이 다른 두 개 이상의 영상에 대하여 각 영상의 특징을 모두 갖는 하나의 영상으로 재구성하는 기술로 의료 분야, 군사 분야, 원격 탐사 분야 등 여러 분야에 활용되고 있다. 지금까지 웨이블렛 기반 영상 융합은 주로 이산 웨이블렛 변환 하에서 고주파 영역에서는 표준편차와 같은 액티비티(activity) 측도를 사용하고 저주파 영역에서는 두 영상의 픽셀값의 평균을 취함으로써 이루어져 왔다. 그러나, 이산 웨이블렛 변환은 이동불변(translation-invariance)하지 않으므로 융합 영상에 블록 인공물이 생기곤 한다. 본 논문에서는 이산 웨이블렛 변환의 단점을 보완한 정상 웨이블렛 변환을 이용하여 고주파 영역에서는 영상 특징에 민감하지 않은 사분위수 범위를 사용하고 저주파 영역에서는 고주파 영역의 사분위수 범위 정보를 이용하여 영상을 융합하고자 한다. 영상 실험 결과, 제안된 방법은 정성적이고 정량적인 평가에서 입력 영상의 종류에 관계없이 로버스트한 결과를 낳음을 알 수 있었다. Image fusion is the process of combining information from two or more source images of a scene into a single composite image with application to many fields, such as remote sensing, computer vision, robotics, medical imaging and defense. The most common wavelet-based fusion is discrete wavelet transform fusion in which the high frequency sub-bands and low frequency sub-bands are combined on activity measures of local windows such standard deviation and mean, respectively. However, discrete wavelet transform is not translation-invariant and it often yields block artifacts in a fused image. In this paper, we propose a robust image fusion based on the stationary wavelet transform to overcome the drawback of discrete wavelet transform. We use the activity measure of interquartile range as the robust estimator of variance in high frequency sub-bands and combine the low frequency sub-band based on the interquartile range information present in the high frequency sub-bands. We evaluate our proposed method quantitatively and qualitatively for image fusion, and compare it to some existing fusion methods. Experimental results indicate that the proposed method is more effective and can provide satisfactory fusion results.
냉수, 스팀 동시 공급형 흡수식 히트펌프 시제품 개발에 관한 연구
풍익(Feng Yi),김한길(Han Gil Kim),하현호(Hyun Ho Ha),조대한(Dea Han Cho),김인관(Dea Han Cho) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
The combination of Absorption Heat Pump Type II and Single Effect Absorption Chiller is the Absorption Heat Transformer with simultaneous supply of chilled water and steam. This type of absorption heat transformer can supply steam of 120℃ and chilled water of 8℃ simultaneously by using hot water of 90℃ as heat source. A heat source of the cycle of this absorption heat transformer passes through generator and high temperature generator. The consist formation of the cycle are evaporator to produce chilled water, high temperature absorber to produce high temperature water, low temperature absorber and condenser for heat dissipation; in addition, the control system is structured exclusively for steam and chilled water. A prototype is designed based on ability of supplying 50 usRT of cooling capacity and 100㎏/h of steam, and manufactured to execute performance evaluation accordingly.