새만금 하구역의 이화학적 환경요인에 따른 수질 평가

김재옥,김원장,조국현,Kim, Jae-Ok,Kim, Won-Jang,Jo, Kuk-Hyun 한국농공학회 2007 한국농공학회논문집 Vol.49 No.5

The objective of this study was to evaluate chemical water quality by hourly monitoring(25hr) of Saemangeum esturary. For this study, we selected 2 sites like a Mangyong Bridge(St. 6) and Dongjin Bridge(St. 7). Inflow of salt water was not detected during low tide(maximum 553, 508cm) of all stations, while the salinity rises were detected in spring tide(750cm). When 602m of maximum tide was reached, salinity concentration was increased at St. 7, while there was no change in St. 6. Therefore, We know that salinity variation is greatly influenced by tide height at survey site. Also, significant variance of salinity(p<0.05) was found between St. 6 and St. 7 because dike construction made the flood tide move into the Dongjin river. Total suspened solids(TSS) concentration was increased because of the river runoff at St. 6, and also the turbulance and resuspension according to salt intrusion at St. 7. During the high tide, the water discharge from the sea seemed to dilute the nutrient but to elevate TSS concentration in St. 7. Silicate and nitrate concentrations in the studied site were decreased by the mixing of sea water, whereas the evident trend of phosphate concentration was not found. This result can be explained by the phosphorus condition. Phosphorus exists inactive when it is affected by hydrated iron and adsorbed onto suspended matters. Compared to the environmental conditions of the St. 6 and St. 7, physical factors such as temperature, dissolved oxygen and TSS have statistically no significant difference(p<0.001), but nutrient concentrations were higher at St. 6 than St. 7. It could be suggested from these results that it is important to control the discharge of fresh water by sewage treatment plants located in St. 6 for water quality management.

조립식 아이스하버식 어도의 현장 적용을 위한 수리모형실험

김재옥,박상현,조재원,황종서,조국현,조성주,Kim, Jae-Ok,Park, Sang-Hyun,Cho, Jae-Won,Hwang , Jong-Seo,Jo , Guk-Hyun,Joh , Seong-Ju 한국농공학회 2004 한국농공학회논문집 Vol.46 No.2

This study was conducted to assess the possibility of the field application of the iceharbor-type precast fishway. When overflow depth of weir is 4.0 cm in model fishway, upper part velocities appear appropriate for upstream migration of fish and the lowest overflow wall (right line) in lower part has shown velocity distribution more or less inadequate for upstream migration. Except that right line, left and middle line revealed that velocities are appropriate for upstream migration of fish. Therefore, we concluded that this fishway owing to be not broad growth width of overflow velocities according to increasing discharges can correspond to variation of water level. Also We consider that various velocities in fishway were effective, because slow velocity line can guide flow for upstream migration. For low flow, the arrangement of different crest level or each overflow part (higher left, middle and lower right, or lower left, middle and higher right) was more effactive than unform crert level. Hole plays an important role as migration pass during drought and flood flow. Therefore, We concluded that this fishway can cope with water depth variation by various overflow wall height change and raise the field applicability with better performance hydraulically and structurally.

PCB조립 In Line System 개발현황

김재옥,Kim, Jae-Ok 한국전자정보통신산업진흥회 1990 電子振興 Vol.10 No.9

전국의 어도실태 전수조사 및 국가어도정보시스템(NFIS) 구축

김재옥,장규상,Kim, Jae-Ok,Jang, Gyu-Sang 한국수자원학회 2011 물과 미래(한국수자원학회지) Vol.44 No.7

금강하구둑 어도의 생태적 기능 평가

김재옥,장규상,신현상,양 현,장준호,Kim, Jae-Ok,Jang, Kyu-Sang,Shin, Hyun-Sang,Yang, Hyun,Jang, Jun-Ho 한국농공학회 2010 한국농공학회논문집 Vol.52 No.3

The ichthyofauna and passing efficiency of fishways were surveyed in Geumgang estuary from May to October in 2009. The fishes collected were classified into 24 species, 23 genera belonging to 8 families. These 24 species consist of 17 freshwater fish species, 3 migration fish species and 4 peripheral freshwater fish species. Seasonal function of fishways showed the migration from May to June and returning to the reservoir of fishes be washed out to sea when sluice gate open by rainfall in July and August. Most of the fishes catched in fishways moved from middle tide to high tide except for July. Fishes ascended fishways between the middle ebb tide and the ebb tide only July, because small freshwater swim against the fishway for leaching the reservoir through the newly formed flow when the water level at the fishway kept dropping. Small fishes that body length less than 200 mm mainly used gabion type fishways and fishes over 200 mm utilized a cascade type fishways. Based on the total individuals collected, the efficiency of the fishway was 1 % for the anadromous fish and over 80 % for freshwater fish. Therefore, it is concluded that ecological function of the fishway in the Geumgang estuary dike be very important not only for fish migration but also freshwater fishes's returning.

스테키히트 시험용 자동발색인지 시스템 개발을 위한 기초 연구(II) -자동 발색 인지 원리를 적용한 발색 자동인지시스템-

김재옥,김철환,박종열,권오철,Kim, Jae-Ok,Kim, Chul-Hwan,Park, Chong-Yawl,Kwon, Oh-Chul 한국펄프종이공학회 2005 펄프.종이기술 Vol.37 No.1

Stockigt sizing test, which is readily affected by individual tester's bias as well as testing conditions in recognizing red coloration, had to be modified to improve its reliability and reproducibility. The novel testing system with the automatic recognizing program of red coloration was developed with the auxiliary equipments including an automatic liquid dispenser and a specimen shifter. The analysis program used a hue value of a droplet image in recognizing a point of time on red coloration instead of RGB values that are not similar to human perception of color. Hue was more sensitive in recognizing the red coloration of a droplet than the other two factors, Saturation and Value. During the test, the program records the time consumed up to a specific hue value of a droplet on a specimen. Differently from the conventional test, the automatic test could obtain a reliable and reproducible sizing degree with a minor error. Furthermore, the Stockigt sizing degree measured by the automatic system showed great correlations with contact angle and Hercules sizing degree. It means that such great correlations will contribute to the development of an integrated measuring system capable of predicting contact angle, surface tension, surface energy and Hercules sizing degree of paper and paperboards through the Stbckigt sizing test. It was meaningful to note that the automatic system for Stbckigt sizing test might be able to used to predict contact angle, Hercules and Cobb sizing degree, based upon the high correlation coefficients.

국내 배수갑문에 설치된 어도의 운영실태 및 개선 방향

김재옥,Kim, Jae-Ok 한국관개배수위원회 2011 한국관개배수논문집 Vol.18 No.1

The status of fishway installed in domestic dikes showed a cascade types and sluice gate types 36% (four sites) and 64% (seven sites), respectively. Fishway of cascade type was constructed four sites (Iweon, Busa, Geum river, Haenam) and only Geum river was one of them has operated much more effectively since remodeling in a fishway and fishways of the others was not operated because of several problems like a desalination, a shortage of inflow water and variation of management elevation. Fishway of sluice gate type was installed seven sites and three sites (Yeongsan, Yeongam, Geumho) one of them were continuously operated until now. This results has a interesting interpretations. Prolonged discharge of inductive water from fishway can positively affect not only ascending of fishes but also fish fauna of around of the sea. The others of a sluice gate fishway were not operated because of seawater circulation through sluice gate until now. The closed reasons of fishway in domestic dikes may be summarized as follows: impassibility of sluice gate open by shortage of inflow water, problem of proper operating by long distance of between fishway and management office, absence of operating manual, seawater circulation, lack of fishway operating awareness. It was takes a long time for solution of hardware part but software part can be to find the answer through making a fishway operation manual and development of education program for manager. In this paper we deal with fishway in domestic dikes. Proper fishway control by manager was essential for ascending of migration fishes especially at fishway installed in dikes. Thus it was necessary to make manual for fishway operation and effort of continuously maintenance.

새만금 수역 및 간척지의 생태현황

김재옥 ( Kim Jae-ok ),최강원 ( Kim Won Jang ),조국현 ( Jo Guk Hyun ),양재삼 ( Yang Jae Sam ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-

This study was conducted to analyzed of the ecological condition of Saemangeum water and reclaimed land areas from 2003 to 2005. We know that fish are free access to the embankment because it was not different of species between inside and ouside at a tide embankment. But Fish species has changed following the completion of embankment as salinity decrease and will survive strong species of low salinity like a Synechogobius hasta. Succession of benthic was very clear from sandy soil dominant species to mud soil by reason of decrease of tidal range. Reclaimed Land areas vary in different localities like a deposition of Kunsan area(LineⅠ), erosion of Kimje area(Line Ⅱ) and mixing of deposion and erosion at Buan area(Line Ⅲ,Ⅳ). We think very difficult understand various variation of reclaimed land like this erosion, deposition and moving. Therefore we make a claim of continuous survey specially about the birth of a new the foreshore in outside of Dike 1 and erosion of the Byeonsan beach.

새만금호 유입부의 수질특성

김재옥 ( Kim Jae-ok ),김원장 ( Kim Won Jang ),조국현 ( Jo Guk Hyun ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-

This study was conducted to analyzed of the characteristics of water quality in the inlet of Saemangeum.. Specifically hourly monitoring(25hr) performed from Feburary 2003 to October 2005. Variation of salinity was no diffirence between at MKB and DJB on the large time of tidal effect on the side DJB was more higher(p<0.01) salinity than MKB by on the small time of tidal effect and rainfall, therefore we know that the tide flow into toward DJB than MKB. Total suspended solids(TSS) increase by turbulence as seawater input. A principal component analysis(PCA) showed that salinity and TSS factors was opposite to TN and TP factors. Therefore we expected that there is no correlation between high TSS and a nutrient increase and seawater circulation have an effect on water quality improvement by dissolved oxygen supply and nutrients dilution. Also, there is very big difference between minimum and maximum values during hourly monitoring(25hr) of TSS(100~800mg/L), COD(4.0~12.0mg/L), TN(3.0~9.0mg/L) and TP(0.2~1.0mg/L) which showed a sine curve 『The lowest-increase-peak-decrease-The lowest』types. The variation of water quality explained by hourly monitoring(25hr) suggests that water quality environments of Saemangeum area may have cycle typical of estuary river depending on tidal effects.

지문인증을 이용한 음성처방전 개발

김재옥(Jae-ok Kim),조철환(Chul-hwan Jo),장영건(Young-gun Jang) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1B

의약분업의 시작으로 환자의 약국에서의 대기 시간을 줄이기 위한 전자처방전이 활성화된 것이 예상되지만, 의사가 전자처방전 작성에 할애하는 노동력을 줄이기 위한 방법과 전자처방전의 신뢰성과 전송상의 환자 등의 여부를 증빙하는 방식이 현재까지 나타나고 있지 않다. 본 연구에서는 이 문제를 지문인증, 음성인식과 압축기술을 이용하여 해결하는 방식을 제안하며, 실제적 구현을 통하여 그 타당성을 제시하였다. 실제 실험실 수준에서 시험한 결과 일반적인 전자처방전에 비하여 처방전 작성시간이 20% 정도 절감되었으며, 복잡한 복약 지도의 경우에는 더욱 효과적일 것이다. 본 시험에서는 온라인 지문인증에 소요되는 시간은 제외하였다.