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奇文奉,李盛鎬,金秀生 동아대학교 환경문제연구소 1987 硏究報告 Vol.10 No.1
For the purpose of treating the sludge which contains hazardous heavy metals, various kinds of studies were made on the unconfined compressive strength which various with the ratio of portland cement. Aluminum sulfate and sodium silicate, the effects upon cements binding influenced by moisture content, volatile solid and pH of sludge, and the amount of leaching solution which comes after cement binding. Erief results from the said studies are as following; 1. As a result of compression tests at various mixing ratio of binders, the highest intensity was found at the ratio of portland cement(0.4) + aluminum sulfate(0.05) + sodium silicate(0.05) + sludge(0.5). Generally the compressive strength tends to be in direct proportion with period of curing. 2. In case that sludge was binded at the same mixing ratio of binders to sludge, the compressive strength was increased and the amount of leaching solution was decreased at low content of moisture and volatile solid and high pH of sludge. 3. while the compressive strength is over than 9.0㎏/㎠, the hazardous heavy metals are not leached from the brick. 4. As the C/S ratio of binders was increasing, the amount of leaching hazardous heavy metals was decreasing. When binders were mixed at the ratio;portland cement+Aluminum sulfate(0.1)+Sodium silicate(0.1) and the C/S ratio of binders were 0.5, leaching solution amount was minimum. 5. The compressive strength of the sludge in the moisture content of 70% to 75% is made of over than 10㎏/㎠ at the curing of 28 days. When binders were mixed at the ratio; portland cement were over 0.5 of the C/S ratio, portland cement+Aluminum sulfate(0.1) were over 0.35 of the C/S ratio, portland cement+Sodium silicate(0.1) were over 0.35 of the C/S ratio and portland cement+Aluminum sulfate(0.05)+Sodium silicate(0.05) were over 0.25 of the C/S ratio.
이호생(Ho-Saeng Lee),정동호(Dong-Ho Jung),문덕수(Deok-Soo Moon),이승원(Seong-Won Lee),김현주(Hyeon-Ju Kim) 한국해양환경·에너지학회 2010 한국해양환경공학회 학술대회논문집 Vol.2010 No.6
The thermodynamic performance of geothermal power generation cycle with 1 kg/s geothermal water flow rate was evaluated to obtain the basic data for the optimal design of cycle. The basic thermodynamic model for cycle is Rankine cycle and the geothermal water and deep seawater was adapted for the heat source of evaporator and condenser, respectively. R-245fa is used as the working fluid. Net power showed the highest value when the evaporating pressure is around 300 kPa under given conditions. The cycle efficiency and net power increased when generator is added with 0.9 generator effectiveness. According to the increase of geothermal water temperature and decrease of cooling water temperature, the cycle efficiency increased. Especially, the net power showed higher values when deep seawater below 5 ℃ is used as a cooling water.
이호생(Ho-Saeng Lee),정영권(Young-Kwon Jung),정동호(Dong-Ho Jung),문덕수(Deok-Soo Moon),김현주(Hyeon-Ju Kim) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
The paper presents the analysis for cycle performance of ocean thermal energy conversion(OTEC) and seawater air-conditioning(SWAC) with deep ocean water and geothermal heat. The basic thermodynamic model for cycle is Rankine cycle and the geothermal water and deep seawater were adapted for the heat source of evaporator and condenser, respectively. The cycle performance such as gross power, sea water and geothermal water flow rate etc. was analyzed on the flowrate variation of deep seawater . The compressor work in case of seawater heat pump system showed 21.7% lower and the COP showed 19.8% higher than that of the existing air-cooled heat pump system when the deep seawater from OTEC is used for the heat source of SWAC.
부유식 파력발전장치용 계류선의 설계 및 안전성 검토에 관한 연구
정동호(Dong-Ho Jung),남보우(Bo-Woo Nam),신승호(Seung-Ho Shin),김현주(Hyeon-Ju Kim),이호생(Ho-Saeng Lee),문덕수(Deok-Soo Moon),송제하(Je-Ha Song) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.4
A study was performed on the design of a mooring line to maintain the position of a floating WEC (wave engergy converison) system. The procedure to design a mooring line is set up and the safety of the designed mooring system is evaluated using commercial software, Orcaflex. The characteristics curve for one line is analyzed to determine the properties and pretension of a mooring line. While considering the ocean environmental condition and importance of a floating WEC system, a multi-line layout is determined. A 4-point mooring system with 4 lines shows the instability in the yaw motion of the floating WEC system under a designed ocean environmental conditon. The redesigned 4-point mooring system with 8 lines is found to be safe on the condtion of a harsh ocean environment. The floating WEC system with the redesigned mooring system also shows stable motion in surge and pithc under operating condition. From a parametric study on the mooring line length, the extreme value of the mooring line tension is found to be very sensitive to the pretension and length of mooring line. The results of this study can contribute to the establishment of a design procedure for mooring lines.