서기 2030년대의 우리나라 농수산 과학의 전망과 그 실현을 위한 연구방안 -농업토목학 분야를 중심으로

권순국 한국농공학회 2000 韓國農工學會誌 : 전원과 자원 Vol.42 No.1

21세기 환경과학에서 부상될 과제

권순국,Kwun Soon-kuk 한국관개배수위원회 1999 한국관개배수논문집 Vol.6 No.1

재순환에 의한 흡수성 바이오필터 시스템의 오수처리효율 향상

권순국,전기설,김성배,Kwun, Soon-Kuk,Cheon, Gi-Seol,Kim, Song-Bae 한국농공학회 2005 한국농공학회논문집 Vol.47 No.3

An Absorbent Biofilter System (ABS) combined with the recirculation process was investigated for the feasible application in additional removing of organics (BOD, SS) as well as nutrients (TN, TP) from small Community wastewater in Korea. Polyurethane biofilter media with high porosity and large surface area were /used for the aerobic system. A part of treated wastewater was recirculated into the anoxic septic tank to promote removal of nutrients. The concentrations of BOD and SS of treated wastewater satisfied the regulations for small on-site wastewater treatment facility (10 mg/L) during the overall experimental period. The effluent concentrations of BOD and SS were decreased with enhancement of removal efficiencies of 95.7 and $96.7\%$. The nitrogen and phosphorus removal efficiencies by the recirculation increased to $52.9\%\;and\;43.2\%$ in average during the overall experimental period, respectively. With the improvement, these values were increased as much as additional 42 and $18\%$ compared with those of non-recirculation. The rates of nitrification and denitrification were enhanced showing $65\~77\%\;and\;42\~92\%$, respectively. The described process modification is a low cost and effective method of enhancing nitrogen and phosphorus removal, especially on existing systems without changing major design components of a treatment facility.

흡수성 Biofilter System에서 동절기 가온이 처리 특성과 성능에 미치는 영향

권순국,전기설,김성배,Kwun, Soon-Kuk,Cheon, Gi-Seol,Kim, Song-Bae 한국농공학회 2005 한국농공학회논문집 Vol.47 No.6

This study was performed to evaluate the need for heating wastewater to enhance treatment efficiency of organic matter (BOD, SS) during cold winter in newly developed Absorbent Biofilter System (ABS) which was established in the Suwon Campus of the Seoul National University. Treatments consisted of non-heating (2000 year) and heating(2001, 2002 year), and sampled data were analyzed during cold winter period as well as post winter period to investigate the influence of heating after winter season. Even the average air temperature showed only $0.4^{\circ}C$ difference between two experimental years, the difference in the average effluent temperature during cold winter period between heating and non-heating experiment was approximately $11^{\circ}C$. The average effluent concentration of organic matter in non-heating treatment exceeded the Korean standards for water quality of discharged effluent in riparian area (BOD and SS 10 mg/L); however, the standards were met in case of heating treatment during both winter and post winter period. Therefore, the need fur heating wastewater during cold winter season in ABS was justified. On the other hand, there was no improvement of treatment efficiency in T-N and T-p, but we observed the more activated nitrification as increasing the wastewater temperature. Because the average underground temperature was $5^{\circ}C$ higher than the average air temperature during cold winter period, we recommend that the ABS can be established in the underground rather than on-ground for saving the heating cost.

논의 환경적 역할과 가치(I) - 논의 환경보전 기능 -

권순국,Kwun Soon-kuk 한국관개배수위원회 1998 한국관개배수논문집 Vol.5 No.1

하천수 정화를 위한 시화인공습지의 초기 수질 정화능

권순국,이경도,조영현,김성배,전기설,Kwun, Soon-Kuk,Lee, Kyung-Do,Cho, Young-Hyun,Kim, Song-Bae,Cheon, Gi-Seol 한국농공학회 2005 한국농공학회논문집 Vol.47 No.1

A prototype surface flow constructed wetland was built in the upstream area of Sihwa reclaimed tidal lands to improve the water quality of Lake Sihwa by treating severely polluted stream water. In this study, we monitored hydrology, macrophyte (Phragmites communis Trin,) growth, and water quality in the Banwol and Donghwa wetlands to evaluate their performance during the initial period after the completion of wetland construction, The average removal efficiency($\%$) in each wetland was relatively low compared with the performance data from the North America Wetland Treatment System Database (NADB), which mainly includes urban sewage-treatment wetlands. However, the average removal rates per unit area ($g/m^{2}/day$) were 0.72, 0.72 and 0.51 (BOD), 2,04, 2.46 and 0.70 (SS), 0.89, 0.43 and 1.09 (TN) and 0.02, 0.02 and 0.02 (TP) in the Banwol and Donghwa wetlands and NADB, respectively. The overall performance of the Banwol and Donghwa wetlands was within the expected range of the wetland system processes contributing the reduction of the pollutant load to Lake Sihwa during the initial period of wetland operation. Considering the low influent concentration, high hydraulic loading rate, and insufficient macrophyte growth since the wetland was constructed, better performance is expected if an improved operational scheme is adopted.

農業工學에 있어서의 電子計算機의 利用 (III) -效果的인 電算機의 利用 方案-

권순국,Gwon, Sun-Guk 한국농공학회 1982 한국농공학회논문집 Vol.24 No.2

지속가능한 농업용수 관리체제, 이대로 좋은가?

권순국 한국농공학회 2005 韓國農工學會誌 : 전원과 자원 Vol.47 No.2

한ㆍEU FTA하의 원산지인증수출자에 관한 검증사례와 실무적용상 유의점에 관한 연구

권순국 한국무역금융보험학회(구 한국무역보험학회) 2018 무역금융보험연구 Vol.19 No.2

원산지인증수출자의 자율증명제도하에서 수입자는 송품장 또는 기타 상업서류에 원산지인증수출자가 작성한 원산지신고서의 제출을 통해 세관에 수입물품의 원산지를 증명하여야 한다. 수출국의 관세당국은 수출물품에 대한 원산지증명 능력을 가지고 있는 수출자를 원산지인증수출자로 인증할 수 있다. 원산지인증수출자는 협정에서 정하는 범위에서 해당 물품에 대하여 자율적으로 원산지를 증명할 수 있으며, 원산지증명에 관하여 간소한 절차를 적용받을 수 있다. 본 연구는 한ㆍEU FTA하의 원산지인증수출자와 관련된 검증사례를 살펴보았으며, 이를 통해 동 FTA를 활용하여 특혜관세 혜택을 향유하고자 하는 무역기업에 다음과 같은 시사점을 제시하고자 한다. 먼저 한ㆍEU FTA에서 규정하고 있는 특혜관세의 적용기준에 대한 확인과 원산지신고서의 발행기준을 확인하여야 한다. 그리고 원산지신고서상의 인증수출자번호에 대한 유효성 확인, 협정관세 사후적용 신청기한과 원산지 검증기한을 확인하여야 한다. 마지막으로 수출국의 간접검증 결과에 대한 해석기준을 확인하여야 한다. Under the origin approved exporter self-certification system, the importer shall verify the customs house the origin of imported goods by submitting an origin declaration made by an origin approved exporter on an invoice or other commercial document. The customs authorities of the exporting country may certify the exporter who has the ability to prove the origin of exported goods as the origin approved exporter. An origin approved exporter may autonomously prove the origin of the relevant goods to the scope stipulated in the relevant agreement and may be eligible for the application of the simplified procedures for proving origins. Among the FTAs in Korea, the KoreaㆍEU FTA, KoreaㆍEFTA FTA and KoreaㆍTurkey FTA are implementing the approved exporter system. In order to achieve the purpose of this study, this paper uses the literature research and case analysis on the origin approved exporter under the KoreaㆍEU FTA. Through this study, this paper is to provide several implications for companies seeking the benefits of the KoreaㆍEU FTA preferential tariffs. The Korean companies to do the following: confirm the application criterion of preferential tariffs stipulated in the KoreaㆍEU FTA, confirm the issuance criterion of the origin declaration, confirm the validity of customs authorization number under the origin declaration, confirm the deadline for ex post facto of conventional tariffs and origin verification, and confirm the interpretation criterion on the indirect verification results of the customs authorities of the exporting country.

스마트 원자로냉각재펌프의 축소모형에 대한 수력성능 예측

권순국(Sun Guk Kwon),박진석(Jin Seok Park),유제용(Je Yong Yu),이원재(Won Jae Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.3

본 연구에서는 SMART 원자로의 사류형 원자로냉각재펌프의 축소모형에 대한 수력성능을 예측하기 위하여 설계점을 포함한 다양한 탈설계점에서의 해석을 수행하였다. 계산시간의 효율성을 위하여 임펠러와 디퓨저 각 1개 유로로 이루어진 계산영역을 해석대상으로 선정하였다. 임펠러와 디퓨저간의 정보교환을 위하여 스테이지 기법을 사용하였다. 정상상태 비압축성 유동조건에서 축소모형의 수력성능특성을 파악하기 위하여 해석영역의 입구와 출구에서 압력차를 측정하여 양정, 효율과 축동력을 산출하였다. 수력성능 곡선은 일반적인 사류펌프의 성능특성을 잘 모사하는 것으로 나타났다. 저유량에서의 펌프 내부유동의 복잡한 흐름을 확인 하였다. An analysis for the hydraulic performance prediction was performed on a reactor coolant pump (RCP) of SMART at the off-design points as well as a design point. In order to save the analysis time efficiently, a single passage composed of an impeller and a diffuser was considered as a computational domain. A stage scheme was used as a mixing model between an impeller and a diffuser interface. A pressure difference between an inlet an outlet was obtained and used to compute the head, efficiency and break horse power (BHP) of a scale-down model under the steady state incompressible flow condition. The predicted curves of a hydraulic performance of a RCP were similar to the typical characteristic curves of a general mixed-flow pump. The complex internal fluid flow of a pump including an internal recirculation loss due to reverse flow, was observed under the low flow-rate condition.