• Title/Summary/Keyword: locating

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Development of PSCF Model and Determination of Proper Values of Control Parameters (PSCF 모형의 개발과 제어변수의 결정)

  • Cheong, Jang-Pyo;Lee, Seung-Hoon
    • Journal of Korean Society for Atmospheric Environment
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    • v.22 no.1
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    • pp.135-143
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    • 2006
  • The objective of this study is to develop PSCF (potential source contribution function) program and determine the optimal values of control parameters to enhance the prediction of PSCF modeling. This study provides an important information and methodologies that can be used to get better results of locating influencing sources, especially unknown and fugitive sources. To determine proper values of control parameters in PSCF model, the diagnostic assessment on the results obtained by the various input conditions was carried out. PSCF model has created and improved from version 1.0 to version 7.0 since 200 I and the measured data (at least > 100) of receptor, and the values of control input parameters should be arranged and determined to obtain reliable results in PSCF modeling. The size of modeling domain must be determined to include enough trajectories to get reliable results. And the size of grid is recommended to be 2.5 $\sim$ 5 degrees for global scale, 0.2 $\sim$ 1 degrees for regional scale and 0.05 degree for local scale.

A Study on the Trend of Show window Display - Focused on department of kangnam area - (쇼윈도우 디스플레이 경향에 관한 연구 - 강남지역 백화점을 중심으로-)

  • 권양숙
    • Korean Institute of Interior Design Journal
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    • no.38
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    • pp.233-240
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    • 2003
  • The purpose of this study was to find the coordination trend of the Image of the color and object from the department show-window display locating in the kangnam area. The result of this study were summarized as following: 1) Show window display determinating the first image of department-store marketing service, playing the role of visual marketing provides the valuable impressions with shoppers in the times of sensibility, 2) In contemporary recognition of "Design is namely culture", show window display proceeds on the direction of concrete and practical presentation of merchandise as many customers are pursuing the high graded luxury brands while their life styles change. 3) Main concept is represented by the coordinated fashion goods on the mannequin or the body and the main theme is displayed variously in the circumferential area or on the articles with the abstract and concrete objects of diverse forms of dominant color and accent color conveying the seasonal theme precisely. 4) The compositive element of color Is the decisive factor of the visual sense of space In the coordination-trends of show window display specially representing the seasonal theme or the intentional messages and conduces to the psychological and mental desire in human and the circumstances, 5) Following the color, the compositive element of object presents the concrete image of theme or the abstract and geometrical sense of space besides the visual sense of space and shows the proportionality and the activity in displaying the show window space.dow space.

Analytical Design Methodology for Recommending VDT Workstation Settings and Computer Accessories Layout

  • Rurkhamet, Busagarin;Nanthavanij, Suebsak
    • Industrial Engineering and Management Systems
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    • v.3 no.2
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    • pp.140-150
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    • 2004
  • Repetitive stress injury at the wrist has been reported as a common injury among visual display terminal (VDT) users (i.e., computer users). Adjusting a VDT workstation (computer table and chair) to maintain a correct seated posture while operating a keyboard is perhaps the most frequently recommended preventive solution. This paper proposes an analytical design methodology based on ergonomic design principles for recommending appropriate VDT workstation settings and layout of individual computer accessories on the computer table. The proposed design methodology consists of two interrelated phases: (1) determination of VDT workstation settings, and (2) design of computer accessories layout. Based on the information about the VDT user, dominant task to be performed, typing skill, and degrees of physical and visual interactions between the user and computer accessories, adjustment and layout solutions are recommended to allow having a correct seated posture while minimizing both physical and visual movements. The results from an experiment show that when adjusting the workstation and locating the computer accessories according to the recommendations given by the proposed design methodology, the user's hand movements can be significantly reduced.

A Resource Allocation Model for Data QC Activities Using Cost of Quality (품질코스트를 이용한 데이터 QC 활동의 자원할당 모형 연구)

  • Lee, Sang-Cheol;Shin, Wan-Seon
    • IE interfaces
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    • v.24 no.2
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    • pp.128-138
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    • 2011
  • This research proposes a resource allocation model of Data QC (Quality Control) activities using COQ (Cost of Quality). The model has been developed based on a series of research efforts such as COQ classifications, weight determination of Data QC activities, and an aggregation approach between COQ and Data QC activities. In the first stage of this research, COQ was divided into the four typical classifications (prevention costs, appraisal costs, internal failure costs and external failure costs) through the opinions from five professionals in Data QC. In the second stage, the weights of Data QC activities were elicited from the field professionals. An aggregation model between COQ and Data QC activities has been then proposed to help the practitioners make a resource allocation strategy. DEA (Data Envelopment Analysis) was utilized for locating efficient decision points. The proposed resource allocation model has been validated using the case of Korea national defense information system. This research is unique in that it applies the concept of COQ to the data management for the first time and that it demonstrates a possible contribution to a real world case for budget allocation of national defense information.

Preliminary Simulation Study on 1 MWe STP System in China (중국 1 MWe급 태양열발전시스템에 대한 기초 운전해석)

  • Yao, Zhihao;Wang, Zhifeng;Kang, Yong-Heack;Kim, Jong-Kyu;Wei, Xiudong
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.698-701
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    • 2007
  • DAHAN, the first 1 MWe Solar Power Tower system locates north to Beijing where nearby The Great Wall is now under construction with cooperation between China and Korea. Results in predicting the preliminary performance of this central receiver system are presented in this paper. Operating cycles under some typical weather condition days are simulated and commented. These results can be used to assess the impact of alternative plant designs or operating strategies on annual energy production, with the final objective being to optimize the design of central receiver power plants. Two subsystems are considered in the system simulation: the solar field and the power block. Mathematic models are used to represent physical phenomena and relationships so that the characteristics of physical processes involving these phenomena can be predicted. Decisions regarding the best position for locating heliostats relative to the receiver and how high to place the receiver above the field constitute a multifaceted problem. Four different kinds of field layout are designed and analyzed by the use of ray tracing and mathematical simulation techniques to determine the overall optical performance ${\eta}_{field}$ and the spillage ${\eta}_{spill}$.The power block including a Rankine cycle is analyzed by conventional energy balance methods.

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Identification of Gear Noise for Industrial Robots (산업용 로봇의 기어소음 특성 고찰)

  • Kim, Dong-Hae;Lee, Jong-Moon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.152-155
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    • 2002
  • An industrial robot noise has various noise sources such as gears, motors, bearings, and controller fans. Among these, gears are the most dominant source for noise. The gear noise, caused by tooth profile, elastic deformation, machining error and wear, is directly correlated with the transmission error of mating gear. Due to the fact that has several axis and many gears, it is difficult to understand the characteristics of the vibration and noise of robots. In this study, some advanced analysis techniques based on digital signal processing such as power spectrum, time spectral map, RPM map, and etc., were applied for locating the dominant frequency components of the robot noises and identifying their sources. In addition, sound quality analysis was performed in order to evaluate the operator's annoyance. The noise and vibration measurements were carried out at several points during the operation of each axis considering the effect of load and posture of the robot. Eased on the results, proper countermeasures to reduce excessive noise level have been suggested considering the characteristics of sources.

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Localization of Rotating Sound Sources Using Beamforming Method (빔형성방법을 이용한 회전하는 음원의 위치 판별에 관한 연구)

  • Lee Jaehyung;Hong Suk-Ho;Choi Jong-Soo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.14 no.12
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    • pp.1338-1346
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    • 2004
  • The positions of rotating sound sources have been localized by experiments with the Doppler effects removed. In order to de-Dopplerize the sound signals emitted from moving sources, two kinds of signal reconstruction methods were applied. One is the forward propagation method and the other is the backward propagation method. Forward propagation method analyze the source emission time based on the instantaneous distance between sensors and the assumed source position, then the signals are reconstructed with respect to the emission time. On the other hand, the backward method uses time delay to do-Dopplerize the acquired data for the received time of reference. In both techniques. the reconstructed signal data were processed using beamforming algorithm to produce power distributions at the frequencies of interest. Experiments have been carried out for varying frequencies, rotating speeds and the object distances. It is shown that the forward propagation method gives better performance in locating source position than the backward propagation method.

Anterior Transcervical Approach to Supperior Sulcus Tumor (전방 경경부접근술을 통한 상구종양 절제술)

  • Choi, Ho;Lee, Cheol-Joo;Hong, Joon-Wha;Kang, Joon-Kyu;Choi, Jin-Wook;Yoon, You-Sang
    • Journal of Chest Surgery
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    • v.34 no.5
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    • pp.426-429
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    • 2001
  • Superior sulcus or pancoase tumor refers to any primarty lung cancer locating in thoracic inlet and causing pain in the periscapular region or aim. These originate inperipheral, and involve th extrapulmonary structures more than parenchyma of the lung. We experienced l case of superior sulcus tumor radically resected via anterior transcervical approach, which provide more safe exposure of cervical structures of thoracic inlet than classis posterolateral thoracotomy. Therefore were report this case with review of literature.

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A Retained Polyethylene Catheter Fragment in Superior Vena Cava - A case report- (상대정맥내 폴리에틸렌관 잔존물 치험 1례)

  • 김주현
    • Journal of Chest Surgery
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    • v.13 no.2
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    • pp.134-137
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    • 1980
  • This represents a case report of the retained polyethylene catheter fragment in superior vena cava. A 39 year old male was admitted to this Korea University Hospital a short time after compression wound on abdomen with heavy cement material in emergency room, a polyethylene catheter was introduced into the right subclavian vein through a needle. But when the polyethylene catheter was attempted to withdraw the catheter was severed by the beveled tip of the needle. Later that day, chest X-ray disclosed the presence of the fragment extending from right subclavian vein to the superior vena cava. {Fig. 1 and Fig. 2]. Local exploration by way of an infraclavicular incision was unsuccessful in locating the catheter fragment. Another attempt was then made remove the catheter by means a biotome, which is originally a device for the biopsy of the myocardium, introduced through the right great saphenous vein. This procedure, though well tolerated by the patient, was in vain. After 11 days later, during that time he was taken a laparotomy with drain, another operation for removal of retained catheter fragment was performed through median sternotomy. After exposure of the right subclavian vein, innominate vein, and superior vena cava, an incision 1 cm in |length was made directly over the palpated catheter. The catheter immediately was picked upward and removed. The length of the catheter was approximately 8 cm. [Fig 3 ] There was no evidence of thromboembolism from the catheter or other complications. The patient made an uneventful recovery, and was discharged asymptomatic on the 9th postoperative day.

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Integrating approach to size and site at a sanitary landfill in Selangor state, Malaysia

  • Younes, Mohammad Khairi;Basri, Noor Ezlin Ahmad;Nopiaha, Zulkifli Mohammad;Basri, Hassan;Abushammala, Mohammed F.M.;Maulud, Khairul Nizam Abdul
    • Environmental Engineering Research
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    • v.20 no.3
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    • pp.268-276
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    • 2015
  • Solid waste production increases due to population and consumption increments. Landfill is the ultimate destination for all kinds of municipal solid waste; and is the most convenient waste disposal method in developing countries. To minimize investment and operational costs and society's opposition towards locating landfills nearby, proper landfill sizing and siting are essential. In this study, solid waste forecasting using Autoregressive Integrating Moving Average (ARIMA) was integrated with government future plans and waste composition to estimate the required landfill area for the state of Selangor, Malaysia. Landfill siting criteria were then prioritized based on expert's preferences. To minimize ambiguity and the uncertainty of the criteria prioritizing process, the expert's preferences were treated using integrated Median Ranked Sample Set (MRSS) and Analytic Hierarchy Process (AHP) models. The results show that the required landfill area is 342 hectares and the environmental criteria are the most important; with a priority equal to 48%.