• Title/Summary/Keyword: Performance Level

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Aerodynamic Performance Enhancement and Noise of Cooling Fans for Driving Motor (전동차용 모터 냉각홴의 공력성능 향상 및 소음특성)

  • Kang, Shin-Hyoung;Park, Tae-Choon;Cho, Nam-Hyo
    • The KSFM Journal of Fluid Machinery
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    • v.1 no.1 s.1
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    • pp.32-40
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    • 1998
  • Aerodynamic performance of a cooling fan of driving motor was enhanced modifying the vane-shroud configuration. Performance of a target model was evaluated to obtain baseline data. The aerodynamic performance and sound pressure level were tested and measured with different numbers of vane of increased length. The tested models show high and stable performance and low values of specific noise level. The long vane-shroud structure induces more stable through flow and decreases the tip leakage flow, which contributes to the increases of performance and efficiency. The sound pressure level increases for the modified model, however, specific noise level decreases.

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Numerical Investigation of Performance Characteristics for Cooling Tower Axial Fans with Sweep (스윕을 가진 냉각탑용 축류홴의 성능 특성에 관한 수치해석적 연구)

  • Oh, K.J.
    • Journal of Power System Engineering
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    • v.13 no.4
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    • pp.31-37
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    • 2009
  • The purpose of this numerical study was to investigate performance characteristics for cooling tower axial fans with sweep. Performance data for the fans with various sweep angles were obtained in terms of the setting angle at a constant flow rate. Viscous flow calculations were carried out to obtain Performance data of the total pressure rise and hydraulic efficiency. A solution of the Ffowcs Williams-Hawkings equations was used to calculate the sound pressure level at three times fan diameter away from the fan. The calculated performance data well represented performance characteristics of the cooling tower axial fan. The total pressure rise and hydraulic efficiency at the same setting angle decreased with sweep angle. Sound pressure level slightly decreased for the fan with a sweep angle of 10 degree. No significant effect of the sweep geometry was found on the sound pressure level.

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The effects of consumer counselor's work training in firm work performance and satisfaction (고객상담 부서 직원의 상담업무교육이 업무수행 및 업무 만족도에 미치는 영향)

  • Huh, Kyung-Ok
    • Korean Journal of Human Ecology
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    • v.13 no.6
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    • pp.917-926
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    • 2004
  • This study examines the effects of consumer counseling education on the work performance and work satisfaction of consumer counselors, controlling the effects of other variables. The results of this study is as below: First, approximately 70% of consumer counselors have not had any education pertinent to their work. The level of work performance was highest in listening to customers' complaints, and then consistence of counseling work and explanation for counseling were next. Professionality was the last in order. Second, consumer counseling education did not affect the work performance. Instead, the number of counselors and work experience, along with whether the counselor majored in consumer studies, were more likely to increase the performance. Finally, educating counseling skills did not affect the level of work satisfaction. Instead, the work performance affected the level of work satisfaction. The number of workers and income were positively related with the level of work satisfaction.

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An Exploratory Study on Causal Relationship between Perceptual Level of Employees and Information System Performance : Case of Public Side Information System Use (조직구성원의 인식 수준이 정보시스템 활용 성과에 미치는 영향에 관한 탐색적 연구 : 공공부문 정보시스템 사례를 중심으로)

  • Park, Ki-Ho
    • Journal of Information Technology Services
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    • v.7 no.2
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    • pp.165-180
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    • 2008
  • Although a number of studies concerning the performance of information system (hereafter, IS) have been performed, those in governmental organizations have rarely conducted. Moreover, there were not many that the perceptual level of individuals might have influence on the information system performance actually. This study tried to investigate the causal relationship between personal perceptual level on the operation and performance of IS, as a result of project for public innovation which deployed in a governmental organization. The targeted IS is for task management. Our survey's respondents are real users in a governmental organization. As a result of statistical analysis, the affecting factors, the perceptual level of individuals such as task process standardization, training and system education, and the active participation of manager positively affected system performance. The result of study can provide some implications to the governmental organizations who want to improve the system performance and efficiently operate their own IS for achieving the organizational goals.

Constructive Characteristics of Outdoor Jacket Depending on the Performance Level

  • Choi, Jinhee;Kyung, Moonsoo
    • Journal of Fashion Business
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    • v.22 no.6
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    • pp.105-114
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    • 2018
  • The purpose of this study is to investigate the diverse constructive characteristics which significantly affects performance besides materials information provided to consumers on functional clothes. Outdoor jackets can classified them according to their performance level. In order to provide consumers with necessary information to choose functional outdoor jackets, 12 brands selling domestic outdoor jackets were investigated and the conclusion of this study was as follows; It was found that fit degree, backpack weight, arm-raise, and number of pockets vary differently depending on performance level of outdoor jacket. Considerable constructive difference was found between high performance jacket mainly worn by professional climbers in extreme environment and jacket that can be worn in daily life. It is found that different characteristic is related not only to each diverse & complex constructive aspect, but also to ability to stretch, resistance to water, venting system of materials depending on performance level of outdoor jacket.

The Effects of User attitude and Expectation on the System performance according to Management level of Information System (시스템의 관리수준에 따라 태도와 기대가 성과에 미치는 영향)

  • Han, Kyung-Il
    • Journal of Digital Convergence
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    • v.5 no.1
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    • pp.91-100
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    • 2007
  • The purpose of this study is to confirm whether user attitude and expectation make a significant difference on the system performance according to management level of IS. The management level is defined as a evaluation of IS and project management. Field research was employed to empirically investigate the relationship among the variables. The finding of the study can be summarized as follows. The positive attitude has a favorable effect on the system performance. But high expectation shows low performance under the strict evaluation.

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A Study on the Factors of SCM Integration Level Influencing SCM and Management Performance : Focused on the Small-Medium Size Enterprises (중소기업의 공급사슬망 통합수준이 SCM 성과 및 경영성과에 미치는 영향에 관한 연구)

  • Sung, Ho-Kyung;Lee, Minho;Boo, Jeman
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.43 no.3
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    • pp.167-178
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    • 2020
  • The purpose of this study is to examine the relationship between internal corporate, supplier, and customer integrations for domestic SMEs on non-financial and financial performance through SCM performance such as flexibility and reduction of uncertainties. To this end, data was collected on 286 SMEs in Korea, and the structural relationships between SCM integration level, SCM performances, and management performance were analyzed. As a result of the analysis, first, it was found that the SCM integration level had a significant positive effect on the flexibility and reduction of uncertainties, which are SCM performances. Second, the flexibility and reduction of uncertainties showed significantly positive effects on the non-financial performance of the companies, but did not directly affect the financial performance positively. Third, the non-financial performance was found to have a positive effect on the financial performance. In addition, the SCM integration level did not have a direct effect on the financial and non-financial performance, but it was found that it affected management performance by mediating the flexibility and reduction of uncertainties, which are SCM performances. That is, although the SCM integration level did not directly affect financial and non-financial performance, it was confirmed that it affects management performance by mediating SCM performances, flexibility and uncertainty reduction. In other words, it was confirmed that the SCM integration level directly or indirectly affects SCM performances and overall management performance. These results imply the necessity to focus on competency in the supply chain management area according to the SCM performance expected by SMEs, and the step by step approaches to the expected effects. In a situation where prior SCM related studies have not been able to present SCM performances and management performance of SMEs that are relatively lacking in their capital and SCM construction capabilities, the findings of this study could suggest the importance of SCM integration from the perspective of SMEs. In addition, from the viewpoint of SMEs, this study suggested that a sequential approach for performance measurement is required (SCM performance → management performance) in relation to the performance factors to be established through SCM.

A Preliminary Study on Housing Performance Indicators Evaluating the level of Deterioration of Apartments (아파트 노후도 평가지표 개발을 위한 기초연구)

  • Cho, Sung-Heui;Lee, Tae-Kyung
    • Proceeding of Spring/Autumn Annual Conference of KHA
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    • 2008.04a
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    • pp.225-230
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    • 2008
  • High-rise and high-density apartment complexes has been built and supplied on a large scale in the metropolis and metropolitan areas since 1980s in order to solve housing shortage in cities. Recently they are raising deterioration problems for aging more than 20 years. moreover, those problems show very special characters such as simultaneity and a large scale. The purpose of this study is to propose a direction for the development of the evaluating indicators to measure the level of deterioration of apartments. The level of deterioration of apartments can be evaluated by housing performance. In order to evaluate the deterioration comprehensively, the housing performance indicators should be developed on the social, economical, and physical dimension. This study analyzed the concept of the apartment deterioration and compared housing performance indicators through literature review. First of all, when considering various factors in the evaluation of the deteriorated apartments, such as evaluating ranges, attributes and dimensions, housing performance indicators should be structured with the hierarchical framework. Second, housing performance indicators evaluating the level of deterioration of apartments should include social, psychological, and cultural aspects of home environments in order to understand adequately the attitude of the middle class toward services that apartments provide. Third, in previous researches, most criteria have been developed and weighted based on only expert opinions regarding performance indicators. So, It is necessary to include residents' opinions in developing performance indicators since they can provide more practical and feasible aspects the experts could not experience or understand.

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Recognition and Performance on Management for Nosocomial Infections among Nursing Students (병원감염관리에 대한 간호학생의 인지도와 수행도)

  • Kim, Gui-Lan;Choi, Euy-Soon
    • Women's Health Nursing
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    • v.11 no.3
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    • pp.232-240
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    • 2005
  • Purpose: This study was designed to identify recognition and the performance level for nosocomial infections amongst student nurses and to provide data for preparing on efficient policy and control program for nosocomial infections. Method: 191 senior nursing student participated in this research from 5 nursing college which allowed data collection, in the city of Seoul. The questionnaire was composed of 73 items(likert scale) about eight areas; aseptic technique, disinfection, precaution, hand washing, urinary tract infection, respiratory infection, catheter related infection, and self care about nosocomial infections. Results: The mean score of recognition and performance level for management of nosocomial infection were 4.29 and 3.41 respectively. The mean score of the recognition level was significantly lower than the performance level in the eight areas. The mean score of both recognition and performance were highest in the area of disinfection. However, the mean score of recognition was lowest in the area of aseptic technique and the mean score of performance was lowest in the area of catheter related infections. The correlation of recognition and performance level was statistically significant. Conclusions: These research findings should be useful in promoting an intensive and continuous educational program on nosocomial infection for nursing students and to establish an efficient policy for preventing nosocomial infections.

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On Setting Low-level Performance Criteria and Uncertainty Characterization for a Nuclear Power Plant (원자력발전소의 저층 성능 기준설정과 불확실성에 대하여)

  • Jo, Nam-Jin
    • Nuclear Engineering and Technology
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    • v.19 no.4
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    • pp.266-278
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    • 1987
  • This paper addresses the issues in setting performance criteria for safety regulation of nuclear power plants. Since setting criteria at the low level is a much more difficult task than it is at the top level, the low-level performance criteria should be derived consistently from the more easily determinable top-level performance criteria. The paper also proposes several approaches to characterizing uncertainties in performance criteria, by extending the reliability allocation methodology that is based on the mean-to-mean mapping to a stochastic multi-objective optimization problem where the state variables are uncertain.

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