http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
위상평균 PTV 기법을 이용한 축류 홴 주위 유동의 속도장 측정 연구
최제호,김형범,이상준,이인섭,Choi, Jay-Ho,Kim, Hyoung-Bum,Lee, Sang-Joon,Lee, In-Seop 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.1
The flow structure around a rotating axial-fan was experimentally investigated using a phase averaging velocity field measurement technique. The fan blades were divided into 4 different phases, for which 500 velocity fields were acquired for each phase angle with a 2-frame PTV system. Velocity field measurements were also carried out at two planes parallel to the axis of rotation, with offsets toward the radial direction of the fan. For accurate synchronization of the PTV system with the phase of the axial fan, two synchronization circuits were employed with a photo-detector attached to the rotating shaft. The phase averaged velocity fields show periodic variations with respect to the blade phase. The periodic formation of vortices at the blade tip is also observed in vorticity contour plots. Locations of local maximum turbulence intensities in the axial and radial directions are found to be located in an alternating pattern. These experimental results can be used to validate numerical calculations and to understand the flow characteristics of an axial fan.
소음ㆍ진동 피해에 대한 사업손실보상의 범위와 기준에 관한 연구
최제호,문영기 국토연구원 2006 국토연구 Vol.50 No.-
What is most urgent in relieving damage, is setting the scope and standards for the compensation to facilitate the damage relief from the business loss. The problems are firstly, due to the atypical nature of the damage from noise or vibration, it is hard to set the scope of the compensation. Secondly, when judging the causal relationships, it is difficult to obtain probability, and to tell who is responsible for the verification. Thirdly, the standards for the existing damage relief from the acceptable level of noise or vibration is different from that under the noise/vibration-related regulations. Forth, the standards for calculating the compensations do not consider the position of the victim. Lastly, since these scopes or standards are not legally binding, they lack consistency and impartiality. To solve these problems, firstly, the scope of compensation should be set even if it is limited, in the beginning, to the buildings and livestock losses that are highly frequent among expected property losses. Secondly, the proof of the causal relationships should be made in the way in which the victim proves the probability and the harmer proves the absence of the causal relationships. Thirdly, the standards for the acceptable level should be improved and unified into one, considering the dB of noise and vibration, regional characteristics, distance from the source of the noise or vibration, the added weight of the circumstances of the victim, etc. Forth, the standards for the compensation calculation should include the difference in value from the previous objects, and as for buildings, the difference in the actually spent construction cost should be also included in the compensation for newly built ones. Fifth, the scope and standards of damage should be regulated as an Act and added to the Clause stipulating the compensation for the outside of the business site.
최제호(Choi Je-Ho),문영기(Moon Young-Ki) 한국주거환경학회 2005 주거환경(한국주거환경학회논문집) Vol.3 No.2
"Project losses" refer to losses incurred outside of the project site area after implementation or completion of a public project. It was understood before that only losses that directly resulted from public uses would be compensated. Therefore, project losses (i.e. losses, such as obstruction of sunshine/scenery, noise, vibration, dust, drying up of water, etc., are treated differently from compensation for taking land and other direct losses) were not traditionally eligible for compensation in principle.<BR> In public projects today, aside from direct infringement of rights from taking of properties, the number of complaints filed not for compensation for direct losses but for project losses that are more indirect losses/damages from execution public projects on the rise.<BR> However, regulations only provide for compensation for land taking and other such direct losses and there are no regulations thatprovide for losses incurred outside of project sites in spite of clear material damages to properties. In the absence of these regulations, such losses/damages are rarely properly compensated.<BR> Disputes between people and project executors occur frequently because of this and often leads to long delays in public projects. Even when damages/losses are compensated, there is no consistency in compensation owing to the different regulations applied by the project executors.<BR> In view of the recent developments, the conclusion that is reached is that there are no actual benefits to be gained from deciding whether losses are within the scope of compensation for losses or for damages. For efficient remedy of the victim"s rights resulting from project losses, it would be more useful and advantageous to include them in the scope of compensation for losses.<BR> For these reasons, consideration should be given to compensations before damage has occurred when losses from a project are clearly anticipated in order to ensure smooth execution of public projects and efficient remedies of infringement to property rights.<BR> There needs to be consistent regulations or rules on compensations to reduce burden on officials in charge of compensation and to ensure consistency in compensated amounts. In addition, scopes and standards of compensation for losses outside of the project area needs to be established before the said tasks can be undertaken.
용융아연 도금공정에서의 SNOUT 내부 유동장 해석 ( I )
신대식,최제호,이상준,Shin, Dae Sig,Choi, Jayho,Lee, Sang-Joon 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.10
PIV(Particle Image Velocimetry) velocity field measurements inside the snout of a1/10 scale model of the Zn plating process were carried out at the strip speed $V_s=1.5m/s$. Aluminum powder particles ($1{\mu}m$) and atomized olive oil ($3{\mu}m$) were used as seeding particles to simulate the molten Zinc flow and deoxidization gas flow, respectively. A pulsed Nd:Yag laser and a $2K{\times}2K$ high-resolution CCD camera were synchronized for the PIV velocity field measurement. From flow visualization study, it is found that the liquid flow in the Zn pot is dominantly governed by the uprising flow caused by the rotating sink roll, with its effect on the steel strip inside the snout largely diminished by installing of the snout. The deoxidization gas flow in front of the strip inside the snout can be characterized by a large-scale vortex rotating clockwise direction formed by the moving strip. In the rear side of the strip, a counter-clockwise vortex is formed and some of the flow entrained by the moving strip impinges on the free surface of molten zinc. The liquid flow in front of the strip is governed by the flow entering the snout, caused by the spinning sink roll. Just below the free surface a counter-clockwise vortex is formed near the snout wall. The moving strip affects dominantly the flow behind the strip inside the snout, and large amount of the liquid flow follows the moving strip toward the sink roll. The thickness of the flow following the strip is very thin in the front side due to the uprising flow, however thick boundary layer is formed in the rear side of the strip. Its thickness is increased as moving downstream toward the sink roll. Inside the snout, the deoxidization gas flow above the free surface is much faster than the liquid flow in the zinc pot. Due to the larger influx of the flow following the moving strip in the rear side of the strip, higher percentage of imperfection can be anticipated on the rear surface of the strip.