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Pressure distribution on rectangular buildings with changes in aspect ratio and wind direction
Lee, Young Tae,Boo, Soo Ii,Lim, Hee Chang,Misutani, Kunio Techno-Press 2016 Wind and Structures, An International Journal (WAS Vol.23 No.5
This study aims to enhance the understanding of the surface pressure distribution around rectangular bodies, by considering aspects such as the suction pressure at the leading edge on the top and side faces when the body aspect ratio and wind direction are changed. We carried out wind tunnel measurements and numerical simulations of flow around a series of rectangular bodies (a cube and two rectangular bodies) that were placed in a deep turbulent boundary layer. Based on a modern numerical platform, the Navier-Stokes equations with the typical two-equation model (i.e., the standard $k-{\varepsilon}$ model) were solved, and the results were compared with the wind tunnel measurement data. Regarding the turbulence model, the results of the $k-{\varepsilon}$ model are in overall agreement with the experimental results, including the existing data. However, because of the blockage effects in the computational domain, the pressure recovery region is underpredicted compared to the experimental data. In addition, the $k-{\varepsilon}$ model sometimes will fail to capture the exact flow features. The primary emphasis in this study is on the flow characteristics around rectangular bodies with various aspect ratios and approaching wind directions. The aspect ratio and wind direction influence the type of wake that is generated and ultimately the structural loading and pressure, and in particular, the structural excitation. The results show that the surface pressure variation is highly dependent upon the approaching wind direction, especially on the top and side faces of the cube. In addition, the transverse width has a substantial effect on the variations in surface pressure around the bodies, while the longitudinal length has less influence compared to the transverse width.
노창섭,최대균,우이형,최부병,Roh Chang-Sup,Choi Dae-Gyun,Woo Yi-Hyung,Choi Boo-Byung 대한치과보철학회 1992 대한치과보철학회지 Vol.30 No.3
This study was performed to investigate the phonetic alterations with upper anterior teeth were missing. To compare the changes of the phonations, before and after insertion of the temporary prosthesis, six subjects who lost their upper anterior teeth were selected (2-male, 4-female). Tested sounds (/ga(가), na(나), da(다), ra(라), sa(사), ja(자), cha(차), ta(타), pa(파), ha(하), gi(기), ni(니), di(디), ri(리), si(시), jl(지), chi(치), ti(티), pi(피), hi(히), seu(스), se(세), so(소), su(수)/were programmed into an IBM AT with and without temporary prosthesis. These experiments were analyzed by formants, consonants durations, and energy level changes with an LSI speech work station program. During the pronunciation of the tested sounds (with and without temporary prosthesis), mandibular movements were recorded to a Mandibular Kinesiogram and analyzed . The findings led to the following conclusions: 1. Objective differences could not be found. However, in every informant, subjective improvement could be noticed. 2. There were no persistant correlations of the formant's changes. And in every informant, phonetic changes were variable. 3. There were various changes of the consonant durations in every informant. By and large, those of /si(시), jl(지), chi(치), Pi(피), hi(히)/ were longer than other tested sounds. After insertion of the prosthesis, durations were shorter. Consonants with /i(ㅣ)/ were longer than with /a(ㅏ)/, with or without prosthesis. 4. With and without temporary prosthesis, mandibular movements were various in the frontal view. Mandibular movements showed lateral deviations, and mandibular positions with /si(시), ji(지), ti(티), seu(스), hi(히)/ were nearer to the mandibular rest position. 5. The kinds of temporary prosthesis and conditions of the missing teeth influenced every informant variously, so there were no correlation between informants. 6. Energy levels increased in all tested sounds with a fixed temporary prosthesis. And, there were no differences between before and after insertion of a removable temporary prosthesis. However, sibilant sounds, and consonants with /i(ㅣ)/ showed a little increased energy level.
부창진,김호찬,김문찬,이윤준 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.2
Electrical resistance tomograpy (ERT) maps resistivity values of the soil subsurface and characterizes buried objects. The characterization includes location, size, and resistivity of buried objects. In this paper, simultaneous iterative reconstruction technieque (SIRT) and truncated least squares (TLS) approach are presented for the solution of the ERT image reconstruction. Results of numerical experiments in ERT solved by the SIRT and TLS approach are presented and compared to that obtained by the Gauss-Newton method.
부창진,김호찬,강민제 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.1
Electrical resistance tomograpy(ERT) maps resistivity values of the soil subspace and characterizes buried objects. The characterization includes location, size, and resistivity of buried objects. In this paper, we have made numerical experiments to compare the performance of the Wenner, Schlumberger, pole-pole, and dipole-dipole electrode arrays for two-dimensional resistivity measurement in ERT. In general, the SNR(signal to noise ratio) of resistivity measurement is directly to the measurement voltage level. The pole-pole and Wenner arrays can give the highest signal level. Results of numerical experiments in ERT solved by four electrode array types are presented and compared using Gauss-Newton inversion algorithm.
부창진,김호찬,이관우 제주대학교 공과대학 첨단기술연구소 2006 尖端技術硏究所論文集 Vol.17 No.1
The accurate measurement of soil resistivity and grounding system resistance is fundamental to electrical safety. However, geological and meterological factors can have a considerable effect on the accuracy of conventional measurements and the validity of the measurement methods. This paper presents optimization method of dc resistivity data acquisition system using Wenner and Schlumbeger method.
부창진,김호찬,이관우 제주대학교 공과대학 첨단기술연구소 2006 尖端技術硏究所論文集 Vol.17 No.2
The grounding system of the subsurface should ensure the safe and reliable operation of power systems, and guarantee a human being's safety in the situation of grounding fault in the power system. The optimal design of grounding systems for subsurface can ensure the equalization of the potential distribution of the ground surface above the grounding system, and can obviously improve the safety of the grounding system. This paper deals with the 2-dimensional reconstruction of the earth's resistivity distribution based on DC resistivity data. This task represents a nonlinear and ill-posed minimization problem with many degrees of freedom. In this work, techniques for regularization and controlling of this problem are depicted and classified. The system of equations as resulting from the application of the Gauss -Newton minimization can be solved efficiently.
부찬혁,강창익,김호찬 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2
The control objective in hard disk drives is to move head as fast as possible to target track and position the head over the center of target track in the presence of external disturbances. The external shock or disk clamping error in manufacturing process causes the disk center to deviate from the disk rotation center. The disk shift acts on control system as disturbance and degrades severely the performance of disk drives. In this paper. we present a new controller that compensates for the periodic disturbance very fast. 'The disturbance compensator is arranged in parallel with the state feedback controller. To avoid the interference with the state feedback controller. the compensator creates compensation signal without feedhack of system output until steady state. Finally, in order to demonstrate the superior performance of the proposed compensator. we present some simulation results using a matlab.
한창훈,박윤명,임영도,최부귀 東亞大學校 附設 情報通信硏究所 1998 情報通信硏究所論文誌 Vol.6 No.1
This paper describes an intelligent cruise control system for automobile. With the remarkable numerical increase of automobiles on the road, the optmized traffic flow control using the cruise control is one of the very important traffic problems to overcome the limitation of an existing road capacity. Based on this idea that minimize the fuel cost and the air pollution, and accept a driver's need for driving, we have developed an intelligent cruise control system for vehicle. This proposed intelligent fuzzy cruise controller was successfully implemented using the fuzzy algorithm, the i80c196 μ-controller board and the throttle valve actuator. The field test results on an linear road was introduced.
朴庄平,夫基源 江原大學校附設體力硏究所 1979 江原大學校附設體育科學硏究所論文集 Vol.- No.4
The objectives of this thesis are to investigate the realitics of the stage freight of athletes, a mental state occurred in the athletic events, and to analyze main causes of the stage freight. This study is a compilation of the answers of 450 senior high school boys who participated in the 60th National Athletic Meetings, to a questionaire and an interview prepared to investigate whether they have a stage freight or not, when they feel it, how they settle it and what is the considerable counter actions. The results deducted out of this study are as follows: 1. Most athletes feel a stage freight, when they are in before or after sporting events. 2. It was when they were aware of a victory or a defeat and they felt that the other side was stronger than them that most athletes experienced a stage freight. 3. Symptoms of a stage freight which the athletes were aware of are those which caused by fallingoff in psychaic tension, such as, a feeling of a frequent urge to urinate, being perturbed, shaking of the heart, being restless and uneasy, shivering of hands or legs, and being not to estimate the state; those symptoms caused by a tension in the sympathetic nerve such as lipsburn, and mouth-drying; and not being able to control the body which is resulted from disorder of athletic competences. 4. To settle the stage freight, the athletes take physical exercises, such as, enough preparatory exercises, taking a deep breath, large and slow motion, high shout and so on, and they set at ease through participating in the athletic meeting regardless of victory or defeat, and by entering the athletic field in advance.