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수변녹지 조성을 위한 토지매수 우선순위 산정 방안 연구
홍진표 ( Jin Pyo Hong ),이재원 ( Jae Won Lee ),최옥현 ( Ok Hyun Choi ),손주동 ( Ju Dong Son ),조동길 ( Dong Gil Cho ),안동만 ( Tong Mahn Ahn ) 한국환경복원기술학회 2014 한국환경복원기술학회지 Vol.17 No.4
The Korean government has purchased land properties alongside any significant water bodies before setting up the buffers to secure water qualities. Since the annual budgets are limited, however, there has always been the issue of which land parcels ought to be given the priority. Therefore, this study aims to develop efficient mechanism for land acquisition priorities in stream corridors that would ultimately be vegetated for riparian buffer zones. The criteria of land acquisition priority were driven through literary review along with experts` advice. The relative weights of their value and priorities for each criterion were computed using the Analytical Hierarchy Process(AHP) method. Major findings of the study are as follows: 1. The decision-making structural model for land acquisition priority focuses mainly on the reduction of non-point source pollutants(NSPs). This fact is highly associated with natural and physical conditions and land use types of surrounding areas. The criteria were classified into two categories-NSPs runoff areas and potential NSPs runoff areas. 2. Land acquisition priority weights derived for NSPs runoff areas and potential NSPs runoff areas were 0.862 and 0.138, respectively. This implicates that much higher priority should be given to the land parcels with NSPs runoff areas. 3. Weights and priorities of sub-criteria suggested from this study include: proximity to the streams(0.460), land cover(0.189), soil permeability(0.117), topographical slope(0.096), proximity to the roads(0.058), land-use types(0.036), visibility to the streams(0.032), and the land price(0.012). This order of importance suggests, as one can expect, that it is better to purchase land parcels that are adjacent to the streams. 4. A standard scoring system including the criteria and weights for land acquisition priority was developed which would likely to allow expedited decision making and easy quantification for priority evaluation due to the utilization of measurable spatial data. Further studies focusing on both point and non-point pollutants and GIS-based spatial analysis and mapping of land acquisition priority are needed.
Jin-pyo Hong(홍진표),Sang-hwan Yoon(윤상환),Hyeon-kyu Yoon(윤현규),Jung-Tae Kim(김정태),Jun-Tae An(안준태) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.8
Gears, which rotate and transmit power by interlocking two cogwheels, were invented in BC. They have been used in various systems, including industrial machinery, transportation devices, and living facilities, through the industrial revolution. Regardless of how they are used, gears are a major source of noise and vibration. Many effective measures are being taken to reduce the radiation noise generated from gears, most commonly by lubrication. Lubrication in gear units reduces friction on interlocking gear surfaces, dampening radioactive noise. This can be very useful for quiet gear design if these lubricating damping effects can be reflected in the analytical phase for gear design. This study experimentally confirms the properties of lubricated and non-lubricated radioactive noise by designing a decelerator gearbox and analyzing the radioactive noise characteristics by torque, rotation, and the number of gears using computer analysis.
배기가스 세정장치내 유체 유동에 대한 다공성 매질 적용 기반의 전산해석적 연구
홍진표(Jin-pyo Hong),윤상환(Sang-hwan Yoon),윤현규(Hyeon-kyu Yoon),김래성(Lae-sung Kim),안준태(Jun-tae An) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.2
Exhaust gases emitted from internal combustion engines contain nitrogen oxides (NOx) and sulfur oxides (SOx), which are major air pollutants causing acid rain, respiratory diseases, and photochemical smog. As a countermeasure, scrubber systems are being studied extensively. In this study, the pressure drop characteristics were analyzed by changing the exhaust gas inflow velocity using a scrubber for a 700 kW engine as a model. In addition, the fluid flow inside the scrubber and the behavioral characteristics of the droplets were studied using CFD, and the design compatibility of the cleaning device was verified. Flow analysis was performed using inertial and viscous resistances by applying porous media to the complex shape of the scrubber. The speed of the exhaust passing through the outlet nozzle from the inlet was determined through the droplet behavior analysis by spraying, and the flow characteristics for the pressure drop were studied. In addition, it was confirmed through computational analysis whether there was a stagnation section in the exhaust gas flow in the scrubber or the sprayed droplets were in good contact with the exhaust gas.
홍진표(Hong, Jin-Pyo),정재화(Chung, Jae-Hwa),서석빈(Seo, Seok-Bin),지준화(Chi, Jun-Hwa),이승종(Lee, Seung-Jun),정석우(Chung, Suk-Woo) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
Integrated Gasification Combined Cycle (IGCC) power plant converts coal to syngas, which is mainly composed with hydrogen and carbon monoxide, by the gasification process and produces electric power by the gas and steam turbine combined cycle power plant. The purpose of this study is to investigate the influence of gasification process to type and structure of gasifier. For this purpose, the performance characteristics of gasification reaction are analyzed with the operation characteristic of pilot-scale 2-stage coal gasifier. It is found that gasification reaction, floating characteristic of melted slag, particle stick of inside of the gasifier, particle stick and deposit of Syngas cooler are the causes in the different performance characteristics.
전산해석을 통한 석탄 및 오일샌드 역청의 가스화 특성 비교
홍진표(Jin Pyo Hong),이승종(Seung Jong Lee) 한국에너지기후변화학회 2016 에너지기후변화학회지 Vol.11 No.1
In order to find ways to effectively and efficient usage of coal and oil sand, which has abundant mining reserve, this study uses computational analysis to determine gasification properties of bitumen extracted from coal and oil-sand. To do so, it develops gasification analysis model, and determine gasification performance such as gasification temperature, syngas composition, and cold gas efficiency, etc., by using major variable such as oxygen and steam mass changes. Base from mass ratio from fuel, oxygen and steam mass ratio’s range has been set between 0.5~2.0 and 0.0~1.0, and see how it affects the gasification performance. The range of oxygen/fuel ratio (for KPC, 0.5~0.8, for bitumen, 0.5~1.1) where KPC (Kaltim Prima Coal) or bitumen reduced by gasification reaction, when the oxygen/fuel ratio has increased by 0.8~0.9, gasification temperature, CO emission, H₂ emission, and cold gas efficiency has shown maximum value, and its value seems to be decreasing after oxygen/fuel ratio has passed 0.9. When steam/fuel ratio increased, gasification temperature and CO emission value has steady decreased, while H2 emission has increased steadily.