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유선재,김종구,김광수 ( Sun Jae You,Jong Gu Kim,Gwang Su Kim ) 한국수산과학회 1994 한국수산과학회지 Vol.27 No.6
The distributions of temperature, salinity, dissolved oxygen, chemical oxygen demand, dissolved inorganic nitrogen and phosphate in the Yellow Sea are described from data collected in June and July, 1994. Based on the observations of water temperature and salinity, the fresh waters originated from the Changjiang River were found to affect the waters adjacent to Cheju Island. In the light of the distributions of dissolved oxygen and chemical oxygen demand, the western part of the Yellow Sea was worse in water quality than the eastern part. Based on data of nutrients, eutrophication indices of the western part were higher than those of the eastern part in summer. It is concluded that the western part of the Yellow Sea appeared to receive high pollution loads from rivers and was evaluated to have high potentiality of red tide occurrence.
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피복두께를 고려한 초고강도 콘크리트와 돌기형 탄소 보강근의 부착성능 평가
유선재,원천봉,장룩파르,윤영수 한국콘크리트학회 2023 콘크리트학회논문집 Vol.35 No.2
본 연구에서는 돌기형 탄소 보강근과 초고강도 콘크리트의 부착 강도 평가를 위하여 콘크리트 강도(일반강도 고강도 초고강도) 및 피복두께(1.5d_b, 2.5d_b, 3.5d_b, 피복 중앙)에 따른 부착실험을 수행하였으며, 탄소 보강근 매입 길이에 따른 부착 강도를 평가하였다. 실험결과, 일반강도 및 고강도 콘크리트에서는 각각 피복두께 2.5d_b, 3.5d_b에서 콘크리트 쪼개짐 파괴를 방지할 수 있었으며 초고강도 콘크리트를 활용한 경우 콘크리트에 미세한 균열만 발생하였다. 또한, 콘크리트 압축강도 증가에 따라 탄소 보강근의 부착 응력은 계속 증가하였으며 적은 매입 길이에서 매입 길이 증가에 따라 부착 응력이 증가하였다. 이를 통해 콘크리트 압축강도, 피복두께 탄소 보강근 매입 길이와 부착 응력의 상관관계를 확인하였으며, 실험결과를 부착 설계기준과 비교하여 돌기형 탄소 보강근의 부착특성을 확인하고자 하였다.
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탄소섬유 시트 및 노 슬럼프 콘크리트로 보강한 콘크리트보의 구조성능 평가
유선재,원천봉,홍세희,윤영수 한국방재학회 2020 한국방재학회논문집 Vol.20 No.4
In this study, the compression and tensile sections of existing concrete were reinforced using carbon fiber sheet (CFS) and no-slump high-strength, ductility concrete (NSHSDC) to evaluate the structural response of the reinforced concrete. From the experimental test results, the CFS showed a low energy dissipation ability when reinforced at both the compression and tensile sections. However, the NSHSDC reinforcement exhibited high energy dissipation and the lowest deflection under maximum load at both the compression and tension sections. The NSHSDC without reinforcement in the compression section, and concrete reinforced with CFS, exhibited lower load resistance and concrete compression failure. Furthermore, a linear relationship between the compression reinforcement and structural performance was observed, which demonstrated the high load resistance and excellent structural performance of the member reinforced with NSHSDC at both the compressive and tensile sections. 본 연구에서는 콘크리트의 압축부 및 인장부 보강에 따른 구조적 거동을 평가하기 위하여 탄소섬유 시트 및 노 슬럼프고강도 고연성 콘크리트를 기존 콘크리트에 보강하였다. 실험결과, 탄소섬유 시트를 콘크리트의 압축부 및 인장부에 모두보강한 부재에서 낮은 에너지 소산 능력을 보였다. 그러나 노 슬럼프 고강도 고연성 콘크리트를 압축부 및 인장부에 모두보강한 부재는 최대하중 작용 시 가장 적은 처짐을 보였으며, 높은 에너지 소산 능력을 보였다. 탄소섬유 시트 및 노 슬럼프고강도 고연성 콘크리트로 압축부를 보강하지 않을 시 최대하중 시 높은 처짐 및 콘크리트 압축파괴가 발생하였다. 최종적으로콘크리트 압축부 보강과 구조성능 사이의 선형관계를 확인하였으며, 노 슬럼프 고강도 고연성 콘크리트로 압축부 및 인장부모두 보강한 부재에서 우수한 하중 저항 및 구조성능을 보였다.
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유선재,김종구,권태연,이석모 한국환경과학회 1999 한국환경과학회지 Vol.8 No.2
To investigate the water quality characteristics and eutrophication of the Keum River, survey were conducted on samples collected from 6 stations in Aug. and Oct. in 1995 and Jan. and May in 1996. The results were summarized as follows ; Concentration of pollutants were in the range of 1.74∼6.35(mean 3.81)㎎/ℓ for BOD and 1.98∼8.21(5.14)㎎/ℓ for COD and 1.46∼51.94(18.52) g/ℓ for TSS. Water quality were evaluate to be 2∼3 grade of station 1 and other stations were 3∼4 grade of water quality criteria. The concentration of nutrients were in the range of 55.2∼735.3(309.3)㎍-at/ℓ for Dissolved inorganic nitrogen(DIN) and 0.06∼6.03(2.80)㎍-at/ℓ for dissolved inorganic phosphate(DIP). Nutrient concentrations in Keum River were usually high and the DIN/DIP ratio ranged from 72 to 2648. The concentration of chlorophyll-a was in the range of 1.1∼143.7(44.3)㎎/㎥. Chlorophyll-a concentration were high 10㎎/㎥ except station 1, which is the value of eutrophication criteria by EPA. Correlations between nutrients and chlorophlly-a were not significant. According to eutrophication evaluation, Keum river was equivalent to the eutrophic state.
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兪善在,朴情吉 군산대학교 1991 群山水産專門大學 硏究報告 Vol.25 No.2
Aquatic system added α, β, γ-Benzenhexaehloride was applied to evaluated the ability of steady state equilibrium partition model. The results from this study could be summarized as follows ; 1.Observed water concentrations of BHC were good agreement with calculated values. 2.In biota(Cyprinus carpio) and sediment, the observed concentrations for initial seven days were lower than calculated values, because of necessity of detention time to reach steady state. 3.In biota, the concentration of α, β, γ-BHC were higher than other compartment but the amount of BHC was below 5%. The most of added BHC presented in the sediment. 4.The predicability of concentration and distribution of BHC by this model were consequently confirmed in Aquatic syste.
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유선재(Sun Jae You),김종구(Jong Gu Kim) 한국수산과학회 1999 한국수산과학회지 Vol.32 No.4
To evaluate the purification capacity of pollutants (COD, PO₄^(3-) -P, NO₃^- -N, Cu, Cd, Pb) in the three tidal flats, Eueunri, Gyewhado, Chunjangdae, the experiments were carried out with the batch reactor equipped with artifical tidal flats. Eueunri tidal flat was 98.8% content of silt and clay and Chungjangdae was 97.84% content of sand. The organic matters (I.L., COD_(scd), POC) in Eueunri tida1 flat were 2∼8 times higher than other tidal flats. The pudfication capacity of COD was 0.75 ㎏/㏊/12 hr in Eueunri, 0.60 ㎏/㏊/12 hr in Gyewhado and 0.55 ㎏/㏊/12 hr in Chunjangdae. The mean purification capacity of COD in three tidal flats was 1.27 ㎏/㏊/day. The calculated purification capacity of COD was 25.4 ton/day in the disappeared tidal flat areas (20,000 ha) of the Saemangeum reclamation. The purification capaaly of phosphorus was 0.21 ㎏/㏊/12 hr in Gyew6ado, 0.39 ㎏/㏊/12 hr in Eueunri and 0.22 ㎏/㏊/12 hr in Chunjangdae. The nitrate was 0.53, 0.74 and 0.43 ㎏/㏊/12 hr, respectively. The purification capacity of heavy metals (Cu, Cd, Pb) were 88.9 g/㏊/12 hr, 11.0 g/㏊/12 hr, 1.7 g/㏊/12 hr in Gyewhado, 89.1 g/㏊/12 hr, 18.0 g/㏊/12 hr, 2.6 g/㏊/12 hr in Eueunri and 55.3 g/㏊/12 6r, 18.0 g/㏊/12 hr, 2.1 g/㏊/12 hr in Chunjangdae, respechvely. Accordingly, the purification capacity of pollutants in Eueunri tidal flat with high contents of organic matter were higher than other tidal flats. So, the pudfication capacity of pollutants were affected by physical and/or chemical characteristics of tidal flats
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