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.

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.

PCB조립 In Line System 개발현황

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

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.

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.

전국의 어도실태 전수조사 및 국가어도정보시스템(NFIS) 구축

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

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.

국가브랜드 마케팅 전략으로서 세계박람회(EXPO) 전시관의 공간 디자인 특성에 관한 연구

김재옥(Kim, Jae-Ok),안희영(Ahn, Hee-Young) 한국실내디자인학회 2011 한국실내디자인학회 학술대회논문집 Vol.13 No.1

As the spread of the global environment and the increase of the brand importance, it is gradually recognized that a nation is considered the brand which is managed as corporate branding. Nation branding is particularly more important factor in a country such as Korea whose economy is entirely dependent on exports. Therefore, this study analyzed the spatial characteristics to design for Korean pavilion in the World Exposition(EXPO) and the factors to build up brand power which are modeling and contents as marketing strategy of nation branding. According to the study, the analysis shows that there are differences with the stream of times in expressions of significance at modeling and contents about the characteristics of the spatial design for Korean pavilion in Expo as marketing strategy of nation branding. Especially around the 2000s, there are contradictions to other factors except the realization of the significance about contents. But the features of the strategic points in the analysis are variously applied and the significance emerges to the pavilion of today’s Expo.

금강하구둑 어도의 생태 기능 평가

김재옥 ( Jae-ok Kim ),장규상 ( Kyusang Jang ),장준호 ( Junho Jang ),황종서 ( Jongseo Hwang ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-

금강하구둑에는 방조제 우측에 30.0m(W)×10.3m(H)×20련의 배수갑문이 설치되어 있고 배수갑문에는 폭 9.0m의 계단식 어도가 1개소 설치되어 있다. 어도는 계단식과 돌망태식 어도로 구성되어 있으며 중간에 물고기 유인을 위한 유인수 수로가 설치되어 있다. 금강하구둑 어도는 설계시 계획했던것 보다 내측 관리수위를 높게 유지하여 어도로서의 기능이 미약하였으나, 어도전면부에 전도수문 설치와 돌망태측 어도를 높이는 작업을 통하여 현재 원활히 운영되고 있다. 따라서 본 연구에서는 금강하구둑 어도 유지 보수 후 어도를 통하여 소상하는 어류를 채집하여 금강하구둑 어도의 생태적 기능을 평가해 보고자 하는 것이다. 본 조사는 만조와 간조가 반복되는 12~24시간을 각각 3시간 간격으로 구분하여 만조→간조 중간(A), 간조 중간→간조(B), 간조→만조 중간(C), 만조 중간→간조(D)의 4구간으로 구분하여 조사하였다. 조사결과 4월~6월까지 출현한 전체 어류는 총 7목 7과 18종이었으며 잉어과 어류가 10종으로 가장 많았으며 바다빙어과, 숭어과 어류가 각각 2종, 멸치과, 학공치과, 망둑어과, 참복과 어류가 각각 1종씩 출현하였고 현재까지 우점종은 은어와 됭경모치였다. 5월에는 어류의 이동이 활발할 것으로 예상되어 24시간 조사를 실시한 결과, 주간에는 A(만조~간조 중간)시기에는 약 1시간 동안 물이 정체되는 상태였고, D(만조중간~만조)시기에도 만조로 접어 들면서 수문이 닫히게 되어 이때 물 흐름이 감소하면서 대부분의 어류가 쉽게 소상하여 가장 많은 개체수의 은어가 상류로 소상하였다. 6월 조사에서도 만조~간조중간 시기에 유속이 정체되고 수문이 열리기 전에 실뱀장어 20여 개체가 확인되어 어도를 통해 실뱀장어의 소상이 이루어지고 있음을 확인할 수 있었다. 시기별로 계단식 어도와 돌망태식 어도에서 소상어류와 개체수에 차이를 보였는데, 주로 은어를 비롯한 소형 어류들은 돌망태식 어도를 통해 소상하였고 숭어와 같이 큰 어종들은 계단식 어도를 통해 소상하는 것으로 나타났다. 이는 돌망태식 어도에는 돌 틈등에 유속이 완만한 부분이 있어 소형어류에게 적합한 것으로 사료되며 계단식 어도는 유속 분포가 대부분 더 빨라 체장이 크고 유영력이 뛰어난 어종들이 주로 이동하는 것으로 보인다. 전체적으로 다양한 어종이 금강하구둑 어도를 통해 소상하고 있었으며, 특히 만조중간~만조가 되는 시기에 가장 많은 어류 이동을 보이고 있었다.

하구둑에 설치한 어도의 관리방안 연구

김재옥 ( Jae Ok Kim ),장규상 ( Kyu Sang Jang ) 한국물환경학회 2010 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2010 No.-