컬러영상의 경계정보와 색상정보를 활용한 동일건물인식

박정환(Park Choung Hwan),손홍규(Sohn Hong Gyoo) 대한토목학회 2006 대한토목학회논문집 D Vol.26 No.3D

기존의 영역기반의 영상정합이나 에피폴라 기하 혹은 고도값 제한 등을 통해 정합의 탐색영역을 줄임으로 영상정합의 효율성을 높이는 방법들은 비슷한 형태의 고층 건물이 밀집되어 있는 대규모 도심지와 같은 경우 오정합의 가능성이 크며 정합에 소요되는 시간도 여전히 오래 걸리는 단점을 갖고 있다. 이러한 단점을 보완하기 위하여 건물 인식을 통한 영상정합법에 대하여 연구를 수행하고자 한다. 본 논문에서는 새로운 영상정합기법의 기초연구로서 컬러영상으로부터 경계정보와 색상정보를 활용하여 동일 건물 인식에 관하여 실험을 수행하였다. 경계정보와 색상정보를 활용하기 위하여 각각 보완된 Hausdorff 거리개념과 보완된 컬러 인덱싱 기법을 적용하였다. 각각의 정보를 단독으로 활용한 경우 동일건물의 인식률이 경계정보의 경우 46.5%, 색상정보의 경우 7.1%로 매우 낮았으나, 두 가지 정보를 조합하여 인식을 실시한 결과 78.5%로 인식률이 높아지는 것을 확인할 수 있었다. The traditional area-based matching or efficient matching methods using epipolar geometry and height restriction of stereo images, which have a confined search space for image matching, have still some disadvantages such as mismatching and time-consuming, especially in the dense metropolitan city that very high and similar buildings exist. To solve these problems, a new image matching method through building recognition has been presented. This paper described building recognition in color stereo images using edge and color information as a elementary study of new matching scheme. We introduce the modified Hausdorff distance for using edge information, and the modified color indexing with 3-D RGB histogram for using color information. Color information or edge information alone is not enough to find conjugate building pairs. For edge information only, building recognition rate shows 46.5%, for color information only, 7.1%. However, building recognition rate distinctly increase 78.5% when both information are combined.

방전 시간과 주위 온도변화에 따른 AC-PDP의 방전 특성 변화 분석

심충환(Choung-hwan Sim),김현규(Hyun-gyu Kim),김윤기(Yun-gi Kim),조성용(Sung-yong Cho),박차수(Cha-soo Park),김동현(Dong-hyun Kim),이해준(Hae june Lee),이호준(Ho-jun Lee),박정후(Chung-hoo Park) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7

본 연구에서는 7인치 샘플패널의 가속 Aging 실험을 통해 Aging time(24hr~529hr)변화에 따른 오방전 발생 Mechanism을 분석하고자 했다. 상온에서 Aging time변화에 따른 정마진, 휘도, Vt close curve를 측정 하였고 시간과 온도(고온: 70℃, 상온: 25℃, 저온: -20℃)에 따른 Discharge time lag의 변화양상을 측정하였다. 그리고 Sustain pulse수의 조절을 통해 패널의 Priming 조건을 제어하면서 오방전 발생 확률을 수치적으로 측정하였다. 실험을 통해, 패널의 Aging time이 늘어남에 따라서 상판의 MgO층에서 Sputtering현상이 발생하여 MgO 잔재들이 하판의 형광체 표면을 덮는 등 방전 개시 전압의 변화가 오방전 발생에 주요한 원인임을 알 수 있었다.

Effect of Smoking and Alcohol Consumption on Seminal Quality in Young Mice

Park, Hyun-Jung,Choung, Eun-Hoi,Kim, Jae-Hwan,Chai, Seung-Youn,Choi, Jin-Yong,Kim, Jin-Hoi,Song, Hyuk The Korean Society of Animal Reproduction 2009 Reproductive & developmental biology Vol.33 No.4

The purpose of this study is to evaluate the effects of alcohol or cigarette smoking on seminal parameters in a large group of mice model. Nine groups (n=20/group) of mice were treated intensive noxious materials that abdominal injection of 21% (v/v) of ethanol, cigarette smoke (10, 20, 30 minutes/day), and combination of ethanol and 30 minutes of smoking. In addition, vitamin C and selenium were also treated to mice exposed to combination of alcohol and smoking to identify the recovering effect. Sperm viability and motility were significantly decreased in either alcohol consumption or smoking exposed group, and combination of both materials have additive detrimental effects on seminal parameters. Mice groups that exposed to alcohol and smoking showed statistically significant decrease in motility and increase of static spermatozoa. Moreover, combination of both treatments showed cumulative effect in increase of static spermatozoa. Treatments of either vitamin C or selenium dramatically recovered detrimental effects of alcohol and smoking on seminal quality, although combination of both antioxidant molecules did not show any additive effect. In conclusion, detrimental effects of alcohol and cigarette consumption on sperm quality and motility were identified in mice model, and these detrimental effects can be compensated to uptake of anti-oxidant molecules.

단상 및 2 상 혐기성 소화에 의한 주정폐수 처리에 관한 연구

박준환,정연규,나승우 대한상하수도학회 1993 상하수도학회지 Vol.7 No.1

The objectives of this paper are to present data to illustrate how an advanced digestion process, two-phase digestion, can provide superior performance in terms of waste stabilization efficiency and net energy recovery. As the result, it is possible to separate enrichment cultures of acidogenic and methanogenic organisms in isolated environments by kinetic control involving manipulation of dilution rates. In single-phase digestion process, HRT and COD loading for effective operation were 14.29 days and 2.33㎏ COD/㎥ day, but two-phase digestion may be conducted efficiently at 7 days of HRT and 5.71㎏ COD/㎥ day of loading. Data from this studies showed that the two-phase process is better than single-phase digestion under all test conditions when compared on the bases of gas yield and production rate, reductions of COD and VS, buffer capacity, and unconverted volatile acids in the effluent.

Phytochemical Constituents from the Leaves of Soybean [Glycine max (L.) Merr.]

Jin Hwan Lee,In-Youl Baek,Myoung-Gun Choung,Tae Joung Ha,Won-Young Han,Kye Man Cho,Jong-Min Ko,Seong Hun Jeong,Ki-Won Oh,Keum-Yong Park,Ki Hun Park 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.3

Phytochemicals study from the leaves of soybean [Glycine max (L.) Merr.], one of Korean edible plant materials were investigated through various chromatographic procedures. The methanolic leaves extracts of soybean yielded 16 phytochemicals, including 5 isoflavones 1-5, 3 flavones 6-8, 1 flavonol 9, 2 pterocarpans 10 and 11, 2 phenolic compounds 12 and 13, 2 phytosterols 14 and 15, and 1 sugar alcohol 16. The structures were fully characterized by analysis of physical and spectral data and were defined clearly as 4,5,7-trihydroxyisoflavone (1), 4,5,7-trihydroxyisoflavone-7-O-β-D-glucopyranoside (2), 4,7-dihydroxy-6-methoxyisoflavone (3), 4,7-dihydroxyisoflavone (4), 4,7-dihydroxyisoflavone-7-O-β-D-glucopyranoside (5), 5,7,4"-trihydroxyflavone (6), 3",4",5,7-tetrahydroxyflavone (7), 3",4",5-trihydroxyflavone-7-O-β-D-glucopyranoside (8), 3,4",5,7-tetrahydroxyflavonol (9), coumestrol (10), glyceofuran (11), 4-hydroxybenzoic acid (12), methyl-4-hydroxybenzoate (13), soyasapogenol B (14), stigmasterol (15), and D-mannitol (16), respectively. Among them, phytochemicals 7-16 were reported for the first time on the isolation and confirmation from the leaves of this species. These results suggest that the leaves extracts of soybean may possess possible health related benefits to human due to the isolated phytochemicals 1-16 which have been well known potential effects on various chronic diseases.

Evaluation of Isoflavones from the Leaves of Soybean (Glycine max L.) Cultivars

( Jin Hwan Lee ),( Tae Joung Ha ),( In Youl Baek ),( Won Young Han ),( Kye Man Cho ),( Keum Yong Park ),( Myoung Gun Choung ) 한국응용생명화학회 2008 Journal of Applied Biological Chemistry (J. Appl. Vol.51 No.4

Identification and Characterization of Phytochemicals from Peanut (Arachis hypogaea L.) Pods

Jin Hwan Lee,In-Youl Baek,Tae Joung Ha,Myoung-Gun Choung,Jong-Min Ko,Sea-Kwan Oh,Hyun-Tae Kim,Hyung Won Ryu,Keum-Yong Park,Ki Hun Park 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.3

Methanol extracts of peanut (Arachis hypogaea L.) pods were chromatographed, which yielded 3 phytochemicals 1-3 including 5,7-dihydroxychromone (1), eriodictyol (2), and 3",4",5,7-tetrahydroxyflavone (3). To confirm the presence of isolated phytochemicals, the pods extracts were performed by high performance liquid chromatography coupled with a photodiode array detector (HPLC-PDA) and a mass spectrometric detector (MSD) with electrospray ionization (ESI). Optimum extraction conditions for phytochemical contents using peanut germplasm were obtained by employing 90% MeOH for 12 hr at room temperature and phytochemicals 1-3 showed significant differences with concentrations of 407.56±23.35, 52.92±5.11, and 2,024.34±134.18 μg/g, respectively. Under this optimal conditions, the contents of phytochemicals 1-3 in peanut pods of 3 Korea cultivars including ‘Jakwang’, ‘Daekwang’, and ‘Palkwang’ exhibited phytochemical 3 was the highest range of 1,338.01-5,162.93 μg/g, followed by phytochemical 1 (590.13-1,382.10 μg/g), and phytochemical 2 (25.12-186.85 μg/g), respectively. Moreover, ‘Jakwang’ exhibited the highest contents of phytochemical (1: 1,362.10±52.49, 2: 186.85±17.69, and 3: 5,162.93±148.64 μg/g, respectively), whereas the lowest contents was found in the ‘Daekwang’ (1: 90.13±22.23, 2: 25.12±2.45, and 3: 1,338.01±62.17 μg/g, respectively). These results suggest that the methanol extracts of peanut pods may possess health related benefits to humans owing to various known biological activities of phytochemicals 1-3.

Effect of Smoking and Alcohol Consumption on Seminal Quality in Young Mice

Hyun Jung Park,Eun Hoi Choung,Jae Hwan Kim,Seung Youn Chai,Jin Yong Choi,Jin Hoi Kim,Hyuk Song 한국동물번식학회 2009 Reproductive & developmental biology Vol.33 No.4

국내 주방쓰레기 발생실태에 관한 연구

민달기,박준환,정연규,정연균 연세대학교 산업기술연구소 1993 논문집 Vol.25 No.1

The waste generation rate of Korea is the first rank of the world and waste generation rate is 2.3 kg per capita per day. In spite of the severe waste problem, the management of wastes is very weak and most of wastes landfilled simply, and the study of waste generation and characteristics is also poor. Therfore, in this wtudy, waste source, unit discharge rate and physicochemical property of organic fraction of muicipal solid wastes, (especially food wastes, are inverstigated, and future waste generation is predicted using DYNAMO simulation. As the result, generation rate of food wastes in dwelling area, market place, cafeteria, and food feeding center are 187 g/cap/day, 975 g/㎡/day, 427 g/㎡/day, and 191 g/cap/day respectively. In addition, the total amount of food wastes generation in Korea is estimated 16,395ton/day (or 6million ton/year), or 454g/cap/day as a unit discharge. Also, the food wastes fraction of the total wastes in the year of 2000 and 2010 is predicted increasing by 31.4%(19,302ton/day) and 35.3% (24,362ton/day)respectively.

Effects of Different Restoration Practices on Nutrient Loss from Sediments after a Forest Fire in Two Watersheds

Hwang, Tae-Hwan,Lee, Kyu-Song,Park, Sang-Deog,Choung, Yeon-Sook The Ecological Society of Korea 2007 Journal of Ecology and Environment Vol.30 No.3

The loss of nitrogen and phosphorus from sediments in two watersheds, one naturally regenerating and one artificially planted, in Sacheon-myun, Gangneung-si, Gangwon Province, were measured two years after a forest fire in 2000. Sediment losses occurred five times in the course of the year. In the artificially planted watershed, $50{\sim}140$ times more nitrogen and $54{\sim}139$ times more phosphorus were lost with sediments during heavy rains, from July to August, than in the naturally regenerating watershed. When the typhoon Rusa struck the country, 1,389 times more nitrogen and 1,647 times more phosphorus were lost from the artificial watershed. In spite of the limited scope of this study, these results suggest that artificially planted watersheds are extremely vulnerable to catastrophic natural disasters such as typhoons. Elevated loss of nutrients in the artificially planted watershed might have resulted from the mechanized silvicultural practices employed immediately after the fire. To maximize soil preservation, the timing and necessity of plantation practices should be reconsidered, and rapidly regenerating vegetation should be protected to promote nutrient uptake and to mitigate nutrient loss from burned forests.