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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.
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.
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.
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.
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.
논 농업지역 생태복원 아이템 개발 및 현장 적용성 검토
김재옥 ( Jae-ok Kim ),장규상 ( Kyusang Jang ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-
논은 주곡인 쌀을 생산하는 곳인 동시에 홍수조절기능, 지하수 함양 기능, 이산화탄소를 흡수하여 산소를 생산하는 기능, 토양 보전등 매우 다양한 기능을 보유하고 있다(농림 수산식품부, 2008). 이러한 공익적 기능 이외에 논은 수서곤충, 어류, 양서ㆍ파충류 및 조류의 서식처, 피난처 및 공급처이다. 그러나 지금까지 논은 쌀 생산성 증대를 위하여, 쌀 생산이외의 기능들은 많이 위축되거나 경시된 것이 사실이다. 농업용수를 원활히 공급하기 위하여 논 주변 용수로의 47%가 구조물화 되었고, 기계화 및 영농효율 증대를 위하여 경지정리 및 구획화 등으로 논의 생태적인 기능은 많은 변화를 가져왔다. 이러한 시설현대화로 현재 우리나라 쌀은 자급자족이 가능하게 되었으므로 앞으로는 쌀 생산 이외의 논의 생태적 기능을 회복하는 작업이 반드시 필요하다. 논의 생태적 기능을 회복하기 위해 기술적으로 접근할 수 있는 요소로는 생물이동통로(어도) 설치, 물의 연중공급방법, 생태형 물꼬 설치, 피난처 및 둠벙 설치, 식생수로 조성 등을 들 수 있으며 정책적으로는 매립 및 개간억제, 농약살포의 자제, 인위적 남획의 금지 및 외래종 유입 억제 등을 들 수 있다. 따라서 본 연구에서는 우리나라 논 농업지역에 적용 가능한 생태 복원 아이템을 개발하여, 우리 논 농업 지역과의 조화를 평가해보고 현장에 적용하여 그 효율을 평가해 보고자 하는 것이 목적이다.