고탁도시 DAF 정수장의 운영 및 진단

권순범,안효원,강준구,손병용 대한상하수도학회 2004 상하수도학회지 Vol.18 No.2

DAF process has been designed considering raw water quality characteristics in Korea. Although direct filtration is usually operated, DAF is operated when the freshwater blooms occur or raw water turbidity become high. Pre-sedimentation is prepared in case when raw water turbidity is very high by rainstorms. A main feature of this plant is that the operation mode can be changed (controlled) based on the characteristics of raw water to optimize the effluent quality and the operation costs. Treatment capacity (surface loading rate) and efficiency of DAF was found to be better than conventional sedimentation process. Moreover, lowdensity particles (algae and alum flocs) are easily separated while it is difficult to remove in sedimentation. One of the main concerns in adoption of DAF (Dissolved-Air-Rotation) process is a high raw water turbidity problem. That is, DAF is not adequate for raw water, which is more turbid than 100MU. In order to avoid this problem, pre-sedimentation basins are prepared in OAF plant to decrease the turbidity of DAF influent. For simulation of the actual operation, bench and full-scale tests were performed for highly turbid water conditions. Consequently, DAF process coupled with sedimentation is suggested that pre-sedimentation with optimum coagulation prior to DAF would be appropriate.

PDP용 유전체의 반사특성과 유전특성

권순석,김명녕,이상래,황문구 한밭대학교 2004 한밭대학교 논문집 Vol.21 No.-

이 논문에서는 P₂O_(5)-ZnO-BaO계와 SiO₂-ZnO-B₂O₃계의 반사특성과 유전특성이 연구 되었다. P₂O_(5)-ZnO-BaO계의 반사율은 SiO₂-ZnO- B₂O₃계의 반사율보다 낮게 나타났고, TiO₂의 함유량이 증가할수록 반사율이 감소되었다. 또한 P₂O_(5)-ZnO-BaO계의 유전율은 SiO₂-ZnO-B₂O₃계의 유전율보다 높은 값을 보였고, TiO₂ 함유량이 증가함에 따라 두 계 모두 유전율이 증가되었다. 이 현상은 공간전하효과로 설명될 수 있다. 본 연구의 결과는 높은 반사율과 높은 절연파괴 강도가 요구되는 플라즈마 디스플레이(PDP)의 하판 유전체, 또는 플라즈마 현상을 응용하는 조명 및 광고용 기구의 반사 유전체로서 응용이 가능할 것으로 기대된다. In this paper, the reflectance and the dielectric characteristics for P₂O_(5)-ZnO-BaO system and SiO₂-ZnO-B₂O₃ system have been investigated as a function of contents of TiO₂. The reflectance was decreased with increasing the contents of TiO₂ contents, and the reflectance of P₂O_(5)-ZnO-BaO system was lower than that of SiO₂-ZnO-B₂O₃ system. The dielectric constant of P₂O_(5)-ZnO-BaO system was higher than SiO₂-ZnO-B₂O₃ system, and the dielectric constant in the both system was increased with increasing of TiO₂ contents. This could be explained as the space charge effects. These results are could be applied to the under plate dielectrics of PDP required high reflective ratio and breakdown strength.

HgCdTe 제작 다이오드 어레이의 열처리에 따른 전기적 특성

이정환,권순석,김명녕,이상래,황문구 大田産業大學校 2001 한밭대학교 논문집 Vol.18 No.-

This paper is investigated on the study of uniformity improvement and electrical characteristics for the 1×128 diode array used Hg^0.7Cd^0.3Te. The electrical characteristics were measured for the device manufactured by several different annealing processes and temperatures being discrepant from existing method of annealing processes and temperatures. The results of uniformity were improved from 60∼80[%], the rate of existing uniformity, to 99[%]. The results obtained from analyzing and examining the characteristics of current-voltage(I-V) and capacitance-voltage(C-V) are following. First, the reverse current show 6[㎁] or so. It is seemed to be resulted from the decrease of direct tunneling and trap tunneling of the device. Second, when the input bias voltage is zero, the maximum value of reverse resistance show 12[GΩ], and the mean value of reverse resistance show 5[GΩ]. Third, it is shown that the voltage of the maximum value of resistance is shifted 0.1[V] to the reverse direction.

Development of Soil Moisture Controlling System for Sesame Based on Smart Irrigation System

( Soon Hong Kwon ),( Jung Duck So ),( Ki-yeol Jung ),( Sanghun Lee ),( Jongsoon Kim ),( Jong Min Park ),( Soon Gu Kwon ),( Dong-hyun Kim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

The smart irrigation system using ICT technology is crucial for stable production of upland crops. The objective of this study was to develop a smart irrigation system that can control soil water, depending on irrigation methods, in order to improve sesame production. In surface irrigation, three irrigation methods (sprinkler irrigation (SI), surface drip irrigation (SDI), and fountain irrigation (FI)) were installed on 68m x 13.5m fields. The distance between the sprinklers in SI was 10m. In SDI and FI, the lateral pipes were laid down 1.2m and 3m interval, respectively. The soil water contents were measured at 10, 20, 30, and 40cm depth, and an automatic irrigation system controls a valve to maintain the soil water content at 10 cm to be 30%. In subsurface drip irrigation, the drip lines were installed in a 30m x 9m plot at a depth of 20cm, with integrated dippers every 70cm or 140cm under ridge or furrow. In controlled drainage system, the culverts were installed with the spacing of 3m and 6m, and it was managed with two ground water level (30cm and 60cm). These two irrigation systems utilized sensor-based monitoring to provide real time soil water status. The seasonal irrigation amounts were 96.4 ton/10a (SDI), 119.5 ton/10a (FI), and 113 ton/10a (SI), respectively. Since SDI system supplies water near the root zone of the plants, the water was saved by 23.9% and 17.3%, compared with FI and SI, respectively. In subsurface drip irrigation, the average soil water content was 38.8%, which was 10.8% higher than the value at the control treatment (28%), implying that it provides water effectively. In controlled drainage system, the soil water contents were greatly influenced on the ground water level; the water contents at the surface zone (0-10cm, 10-20cm) with 60cm ground water level was 25.3% and 31.6%, which were 9.4% and 8.4% lower than the values with 30cm ground water level. In addition, the high water contents were measured in the narrow culvert spacing. In conclusion, this smart irrigation system can reduce production costs of upland crops, thereby improving food self-sufficiency in Korea.

Epidemiological Prevalence of Avian Pathogenic Escherichia coli Differentiated by Multiplex PCR from Commercial Chickens and Hatchery in Korea

Kwon, Soon-Gu,Cha, Se-Yeoun,Choi, Eun-Ju,Kim, Bo-Kyung,Song, Hee-Jong,Jang, Hyung-Kwan The Korean Society for Microbiology 2008 Journal of Bacteriology and Virology Vol.38 No.4

We examined 216 Escherichia coli (E. coli) isolated from chickens and environmental specimens from hatcheries between 2005 and 2006 in order to evaluate the epidemiological prevalence of avian pathogenic E. coli (APEC) in Korea tentatively by multiplex PCR. The multiplex PCR which was used as tentative criteria of APEC targets 8 virulence-associated genes; enteroaggregative toxin (astA), increased serum survival protein (iss), iron-repressible protein (irp2), P fimbriae (papC), aerobactin (iucD), temperature-sensitive hemagglutinin (tsh), vacuolating autotransporter toxin (vat), and colicin V plasmid operon (cva/cvi) genes. The number of detected genes could be used as a reliable index of their virulence. It was demonstrated that E. coli strains already typed as APEC always harbor 5 to 8 genes, but non-APEC strains harbor less than 4 genes. Assuming the criteria of APEC is a possession of more than 5 virulence-associated genes, we discriminated 24 APEC strains among the 216 E. coli strains. Contamination rates of APEC in the field were 31.3% in layers, 14.0% in broilers, 2.7% in broiler breeders, and 0.0% in environmental specimens from hatcheries. The combinational tendency of APEC examined is a fundamental possession of astA, iss and iucD genes and addition of cva/cvi, tsh, vat, and irp2 genes which have a critical importance for virulent traits of APEC. Compared with intravenous chicken challenge or embryo lethality assay, multiplex PCR method could be useful to discriminate APEC rapidly for convenient diagnosis.

Epidemiological Prevalence of Avian Pathogenic Escherichia coli Differentiated by Multiplex PCR from Commercial Chickens and Hatchery in Korea

Soon-Gu Kwon,Se-Yeoun Cha,Eun-Ju Choi,Bokyung Kim,Hee-Jong Song,Hyung-Kwan Jang 대한미생물학회 2008 Journal of Bacteriology and Virology Vol.38 No.4

Comparative Study on Efficiencies of Naturally-Ventilated Multi-Span Greenhouses in Korea

Soon-Hong Kwon(권순홍),Sung-Won Jung(정성원),Soon-Gu Kwon(권순구),Jong-Min Park(박종민),Won-Sik Choi(최원식),Jong-Soon Kim(김종순) 한국산업융합학회 2017 한국산업융합학회 논문집 Vol.20 No.1

This research analyzed the ventilation effect of the multi-span greenhouse based on the types of greenhouse structure, weather conditions, and locations inside the greenhouse. To compare and analyze the ventilation effects with different types of greenhouse, the uniform environmental conditions should be selected in advance. But these factors are not controlled and require tense many precision facilities and labor forces. Thus, the CFD simulation was used for the air stream to be analyzed qualitatively and quantitatively. In addition, for the ventilation effect analysis, the TGD (Tracer Gas Decay) was used to overcome the shortcomings of the current ventilation measurement method. The calculation error of ventilation rate using TGD was low (10.5%). Thus, the TGD is very effective in calculating the ventilation efficiency. The wind direction of 90 degrees showed the best ventilation effect. The ventilation rate also decreased along the air circulation path, and the rate was the lowest around the outlet. The computed fluid method (CFD) turned out to be a power tool for simulating flow behavior in greenhouse.

‘사람됨’(being human)과 ‘바로삶’(right living) : 인간존재의 의미와 도덕실천의 의무

권순구(Soon-Gu Kwon) 영남신학대학교 2005 신학과 목회 Vol.24 No.-

Man is a social being who lives together with other persons. To live peacefully one another in the very complicated and money-driven society each of human beings has to practice the art of living together with others. Man himself should remain as man who has an ability to treat other as man who deserves human dignity, otherwise man is apt to fall down into an animal-being who is thought to be opposite to a human being. In the period of economic crisis man concentrates himself only to survive in a society hard to keep living, so he has no room to think how to live a morally good life and it becomes hard for him to make an effort to be a morally good person. When he thinks of (biological) existence only, it is almost hard for him to reflect and lead his (moral) life. At the time of the oppression of poverty and economic depression mutual care between fellow -human beings is required to live together. Obviously a human being starts his life as a biological person, but he should strive to be a being human who is a moral person. The biological person is only a person before he makes himself be a moral one. The dignity of a person starts as the biological being, but the social recognition is given to the moral being. Therefore it is more important to ask who man is than what he is. A view of a human being shows the degree in which each estimates the dignity of man. Many people, especially including some animal ecological scholars and behavioristic psychologists, consider a human being as a member of the kingdom of animal. Some people regards him as machine producing goods, and some looks him as the goods itself. These three views underestimate the dignity of human beings. The fourth view is to look the man as a divine being who has the image of God. When we take the fourth view, it is possible for the human being to achieve the personality of the image of God. The question of 'who is man?' is morally more desirable than the Question of 'what is man?' A human being needs a model to make him 'being human', because he has learned and continues to learn almost everything by imitating the life of model who is thought to have lead a morally good life. Some moral characteristics of the good model of being human contain, I think, at least virtues like responsibility, humility and love. These three virtues should be considered as the fundamental ones for the achievement of the human task of 'being human' and 'right living.'

지표면 별 영상잡음과 영상질감을 이용한 SAR 클러터 영상 생성

권순구 ( Soon Gu Kwon ),오이석 ( Yi Sok Oh ) 대한원격탐사학회 2009 大韓遠隔探査學會誌 Vol.25 No.4

본 논문에서는 다양한 종류의 지표면에 대하여 분석하여 산란 특성을 연구하고 SAR 클러터 영상을 제작하고 실제 SAR 클러터 영상과 비교한다. 먼저 지표면의 특성을 분석하기 위해 각각의 지표면에 대해서 입력변수를 측정한다. 측정한 데이터를 이용하여 Oh 모델, PO 모델, radiative transfer model (RTM)을 이용하여 각도 별 산란계수를 구하였다. SAR 영상 생성을 위해 먼저 측정 지역의 DEM (digital elevation map)과 LCM (land cover map)데이터를 제작한다. DEM 데이터의 단일 픽셀(pixel)의 높이 정보를 이용하여 픽셀의 입사각을 계산하고 입사각에 따른 해당 지표면의 산란 계수를 대입한다. LCM 데이터는 해당 지역의 답사를 통해 논, 밭, 산, 길, 인공물 등을 1:5000 지도에 기입하여 SAR 영상 생성에 사용한다. DEM 데이터와 LCM 데이터를 사용하여 입사각과 지표면 종류에 따른 계수를 계산하고 영상잡음(speckle)과 영상질감(texture)을 이용하여 SAR 클러터 영상을 생성하고 실제 영상과 비교한다. In this paper, synthetic aperture radar (SAR) clutter images are simulated based on the extensive analyses for radar backscatter characteristics of various earth surfaces, and the simulated images are compared with measured SAR images. At first, the surface parameters including soil moisture content and surface roughness parameters and other parameters for vegetation canopies are measured for various surfaces. The backscattering coefficients for the surfaces are computed using theoretical and empirical models for surface scattering and the radiative transfer for vegetation-canopy scattering. Then, the digital elevation map (DEM) and land cover map (LCM) are used for the SAR image generation. The SAR impulse response (correlation function) is also employed to simulated reliable SAR images. Finally, the appropriate speckle and texture parameters for various earth surfaces are used for generating the SAR clutter images.

부동산 수익에 대한 인식과 실제간 간극

권순구(Soon Gu Kwon),강명구(Myoung Go Kang) 서울연구원 2011 서울도시연구 Vol.12 No.1