France 하천 수질 평가법으로 이용하는 규조류 지수에 관한 소개

정상옥 ( Sang Ok Chung ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.4

Since, in 1970, diatoms and diatom indices was first used in measuring quality of streams and rivers at the Seine Water Agency in France, five other water agencies began to show interests since 1990. In 1994, associated with CEMAGREF (Centre National du Machinisme Agricole du Genie Rural et des Eaux et des Forets : environmental science and expertise for the sustainable management of land and water), the six French Water Agencies (Seine, Rhone-Mediterranee-Corse, Artois-Picardie, Loire-Bretagne, Rhin-Meuse and Adour-Garonne) developed a practical diatom index, which is liable to be used routinely in the territorial streams and rivers of whole France, and which is liable to promote and facilitate its use in monitoring water networks. In 1995, the first version of a biological diatom index (IBD) was generated by them. Since then, the software update for IBD calculation and the user`s network have led to numerous practical applications in France. Furthermore, the Water Agencies have run applicable programs on the National Basin Network from 1996, and the initial data set of IBD was completed. Re-examination of the complete data set was done at the end of 1998, and the tests on different calculation options of the IBD led to a third version of this index in June, 2000 (AFNOR NF T 90-354).

알루미늄 용융 도금된 304 스테인리스강의 해수 내 전기화학적 부식 특성 평가

정상옥(Sang-Ok Chong),박일초(Il-Cho Park),한민수(Min-Su Han),김성종(Seong-Jong Kim) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.6

Stainless steel has poor corrosion resistance in marine environment due to the breakdown of a passive film caused by chloride. It suffers electrochemical corrosion like pitting corrosion, crevice corrosion, and stress corrosion crack (SCC) in marine environment. In general, it indicates that the passive film of Al₂O₃ has better corrosion resistance than that of Cr₂O₃ in seawater. This paper investigated the damage behavior 304 stainless steel and hot-dip aluminized 304 stainless steel in seawater solution. Various electrochemical experiments were carried out including potential measurement, potentiodynaimic experiment, Tafel analysis and galvanostatic experiment. As a result of anodic polarization experiment, higher pitting damage depth was indicated at 304 stainless steel than hot-dip aluminized 304 stainless steel. In addition, relatively higher corrosion current density was shown at hot-dip aluminized stainless steel as a result of Tafel analysis.

해양 환경 하에서 431 스테인리스강의 하이브리드 실험을 통한 캐비테이션 손상 거동

정상옥(Sang-Ok Chong),김성종(Seong-Jong Kim) 한국표면공학회 2013 한국표면공학회지 Vol.46 No.6

The demand for stainless steel is continuously increasing with the development in offshore industry due to its excellent corrosion resistance characteristics. However, it suffers cavitation-erosion in application of high rotating fluid and the damage accelerates in combination with electrochemical corrosion because of Clion in sea water. This paper investigated the complex damage behavior for 431 stainless steel, that is one of martensite stainless steels, through the hybrid test in sea water. Various experiments were carried out, including potential measurement, anodic/cathodic polarization experiment and Tafel analysis. Surface morphology was observed and damage depth was analyzed by SEM and 3D microscope after each experiment, respectively. The results revealed that more active potential was observed under cavitation condition than static condition due to breakdown of passive film and activation of charge transfer, and that higher corrosion current density was obtained under cavitation condition due to synergistic effect of corrosion and erosion.

미국 콜로라도강 수자원 개발과 관리

정상옥,Jeong, Sang-Ok 한국수자원학회 2010 물과 미래(한국수자원학회지) Vol.43 No.6

한국 고창군 하전 갯벌의 미세조류 및 환경의 시공간적 변화

정상옥 ( Sang Ok Chung ),조윤식 ( Yoon Sik Cho ),최윤석 ( Yoon Seok Choi ),정희도 ( Hee Do Jeung ),송재희 ( Jae Hee Song ),한형균 ( Hyoung Kyun Han ) 한국환경생태학회 2015 한국환경생태학회지 Vol.29 No.5

본 연구에서는 2014년 2월부터 11월까지 전북 고창의 하전 해수와 갯벌 표면의 식물플랑크톤과 저서규조 및 그서식환경의 시공간적 변화를 조사하였다. 해수에서는 2월부터 10월까지 매월 식물플랑크톤 현존량, 종조성과 개체수 및 환경요인을 측정하였는데, 식물플랑크톤 엽록소 a 농도와 개체수는 2월에 가장 높았고 규조가 우점군이었으며 총 113종이 출현하였다. 저서규조 및 그 서식환경인 표층퇴적물에 관한 연구는 하전리 측선에서 간조 시에 계절별(2, 5, 8, 11월)로 각 9개의 정점에서 실시하였다. 표층퇴적물은 주로 사질실트와 사질니로 이루어졌으며, 유기물 오염도는 낮게 나타났다. 저서미세조류 생물량(엽록소 a)은 봄과 여름에 높게 나타났다. 저서규조는 총 163종이 출현했으며 Navicula sp.1과 Paralia sulcata 두 종이 우점하였다. 해수와 저서 표층에서 동일시기에 출현한 종은 5종으로 관찰되었다. We studied the spatio-temporal microalgal (phytoplankton and benthic diatoms) and environmental changes of the Hajeonri intertidal zone from February to November 2014. Seawater and phytoplankton analysis were conducted all through the months. The species, composition and abundance of phytoplankton and environmental factors were measured. As a result, diatom was dominant among a total of 113 species identified. On a seasonal basis (Feb. May, Aug., Nov.), we carried out studies on benthic diatoms on the surface of the sediments and their habitats at nine stations on the transect line at Hajeonri at low tide. The grain of the surface sediments was mainly composed of sandy silt and sandy mud. Organic pollution level was low. Benthic microalgal biomass (chlorophyll a) was high in the spring and summer. A total of 163 benthic diatom species were identified. Navicula sp.1 and Paralia sulcata were dominant over the study period. Five diatom species were observed both in water column and on surface sediment at the same time.

시나리오별 논에서의 Molinate 노출위험도 분석:(1)시뮬레이션 결과 분석

정상옥,박기중 한국농공학회 2008 한국농공학회논문집 Vol.50 No.2

The effects of water and pesticide management practices on ponded water pesticide concentrations in a paddy plot were analysed using the RICEWQ model. The molinate which is a herbicide widely used in rice culture, and fuly calibrated with field data obtained from a paddy plot in Daegu. The calibrated model was run using water and pesticide management scenarios with a set of measured meteorological data for 1997-2006 in Daegu.For all thre ponded water depths with the label rate application, the amount of molinate disipated in ponded water and volatilized accounted for more than 70%, and the runoff losses were less than 9%. The molinate losses with the deep and shallow ponded depth, the very shallow depth was the best with regards to the reduction of molinate runoff losses. Simulations with different pesticide aplication rates, label rate and double label rate, showed molinate concentrations in the ponded water increased linearly with the application rate increase.

Turbo-tape을 이용한 배추의 점적관개 효과분석

정상옥 한국농공학회 1993 韓國農工學會誌 : 전원과 자원 Vol.35 No.4

For efficient irrigation of structured horiculture and upland crops, a new technique of drip irrigation using the turbo-tape for Autumn Chinese cabbage was developed. The turbo-tape worked well, and based on this study The following results were obtained ; 1. The emission uniformity of the turbo-tape was very good with a uniformity coefficient of 92.5%. 2. Starting point of irrigation at 80% of the wilting point was better than at the wilting point itself. 3. The irrigation amounts for the Autumn Chinese cabbage cultured ranged 315 to 470mm depending upon the irrigation methods, turbo-tape irrigation method could conserve irrigation water about 37% compared to the furrow irrigation method. 4. Average yields were 2, 430g when the starting point of irrigation was at the wilting point, while 2, 680g when it was at 80% of the wilting point.

RICEWQ 모형의 보정 및 민감도 분석

정상옥,손성호,박기중 한국농공학회 2008 한국농공학회논문집 Vol.50 No.2

The main objectives of this study are to calibrate the RICEWQ model with Korean field data and then analyse the sensitivity of the parameters to identify sensitive parameters. The RICEWQ is widely used to predict was selected, and field observations for water and pesticide balance were performed from 4 June to 2 September 2006. The molinate, which is a herbicide widely used for weed control in rice culture, was selected. The RICEWQ model was sucessfully calibrated both for the water and pesticide mass balance. The calibrated model showed a RMSE of 0.537 cm for ponded water depths and a RMSE of 0.036 mg/L for the molinate concentrations in the ponded water. The most sensitive parameters for molinate concentrations in ponded degradation rate in water, volatilization coefficient, and release rate for slow release formulation. In contrast, the RICEWQ model was not sensitive to parameters such as hydrolysis degradation rate in water and degradation rate in unsaturated soil.

한국 고창군 하전 갯벌의 미세조류 및 환경의 시공간적 변화

정상옥,조윤식,최윤석,정희도,송재희,한형균 한국환경생태학회 2015 한국환경생태학회지 Vol.29 No.5

본 연구에서는 2014년 2월부터 11월까지 전북 고창의 하전 해수와 갯벌 표면의 식물플랑크톤과 저서규조 및 그 서식환경의 시공간적 변화를 조사하였다. 해수에서는 2월부터 10월까지 매월 식물플랑크톤 현존량, 종조성과 개체수 및 환경요인을 측정하였는데, 식물플랑크톤 엽록소 a 농도와 개체수는 2월에 가장 높았고 규조가 우점군이었으며 총 113종이 출현하였다. 저서규조 및 그 서식환경인 표층퇴적물에 관한 연구는 하전리 측선에서 간조 시에 계절별(2, 5, 8, 11월)로 각 9개의 정점에서 실시하였다. 표층퇴적물은 주로 사질실트와 사질니로 이루어졌으며, 유기물 오염도는 낮게 나타났다. 저서미세조류 생물량(엽록소 a)은 봄과 여름에 높게 나타났다. 저서규조는 총 163종이 출현했으며 Navicula sp.1과 Paralia sulcata 두 종이 우점하였다. 해수와 저서 표층에서 동일시기에 출현한 종은 5종으로 관찰되었다. We studied the spatio-temporal microalgal (phytoplankton and benthic diatoms) and environmental changes of the Hajeonri intertidal zone from February to November 2014. Seawater and phytoplankton analysis were conducted all through the months. The species, composition and abundance of phytoplankton and environmental factors were measured. As a result, diatom was dominant among a total of 113 species identified. On a seasonal basis (Feb. May, Aug., Nov.), we carried out studies on benthic diatoms on the surface of the sediments and their habitats at nine stations on the transect line at Hajeonri at low tide. The grain of the surface sediments was mainly composed of sandy silt and sandy mud. Organic pollution level was low. Benthic microalgal biomass (chlorophyll a) was high in the spring and summer. A total of 163 benthic diatom species were identified. Navicula sp.1 and Paralia sulcata were dominant over the study period. Five diatom species were observed both in water column and on surface sediment at the same time.

P-103 : Poster ; Promising Effect of Ifosfamide and Carboplatin Combination Therapy in Refractory Small Cell Lung Cancer

정상옥,박보미,박연희,최재우,정재욱,박동일,김선영,김주옥,정성수,문재영,이정은 대한결핵 및 호흡기학회 2013 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.116 No.-

Small cell lung cancer (SCLC) has a characteristics of good response to chemotherapy and also high recurrence rate. Almost SCLC become refractory after multiple chemotherapies, so it is very hard to decide the next chemotherapy regimen. We herein report the case of a 43-years-old female who was responsive to 4th line chemotherapy with carboplatin and ifosfamide combination. After three cycles of this chemotherapy, the tumor size markedly decreased from 13.4 cm to 7.2 cm. It is significantly rare to be responsive to 4th line chemotherapy in SCLC. Carboplatin with Ifosfamide combination is not popular regimen for SCLC. There are some clinical trials with ifosfamide and other drugs. This report indicates that even refractory SCLC may be response to carboplatin and ifosfamide combination. Small cell lung cancer (SCLC) has a characteristics of good response to chemotherapy and also high recurrence rate. Almost SCLC become refractory after multiple chemotherapies, so it is very hard to decide the next chemotherapy regimen. We herein report the case of a 43-years-old female who was responsive to 4th line chemotherapy with carboplatin and ifosfamide combination. After three cycles of this chemotherapy, the tumor size markedly decreased from 13.4 cm to 7.2 cm. It is significantly rare to be responsive to 4th line chemotherapy in SCLC. Carboplatin with Ifosfamide combination is not popular regimen for SCLC. There are some clinical trials with ifosfamide and other drugs. This report indicates that even refractory SCLC may be response to carboplatin and ifosfamide combination.