• Title/Summary/Keyword: Multi-Criteria

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A Study on the Subjective Responses to Environmental Noises (주거 환경 소음에 대한 거주자 반응조사에 관한 연구)

  • Song, Guk-Gon;Lim, Jun-Yeong;Lee, Tai-Gang;Kim, Sun-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.04a
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    • pp.5-8
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    • 2008
  • Apartment housing is a widely-spread type in Korean housing market. Nevertheless, it has caused serious problems such as traditional community corruption, unsafe structure, defects and litigation from noise. Noise, especially in concrete structure for apartment housing, is hardly controlled in proper to prevent sound transmission between upper and lower families with existing system, In foreign countries, there are floating floor systems to enhance the noise control performance in multi-family housing. Therefore, this study aims to analyze subjective responses on sound characteristics in residential buildings. We analyzed the residential response and the quantities of measured data from environmental noise. The results of this study will be useful to provide guideline to make policy of environmental noise and criteria.

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Dynamic Stability Evaluation of Special Bridge for High Speed Railroad under Vertical Ground Motion (연직 지진하중을 받는 고속철도 특수교량의 주행안정성 평가)

  • Kim, Dong-Seok;Kim, Sung-Il
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.1464-1469
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    • 2010
  • In this paper, the dynamic stability evaluation of special bridge for high speed railway under ground excitation is performed. The mass, damping, stiffness matrices of bridge are derived from the modal frequencies and mode shape vectors which can be obtained by commercial program. And the high speed train is modeled as multi-single d.o.f models for the sake of vehicle-bridge interaction analysis. In the vehicle-bridge interaction analysis, the vertical directional interaction is only considered. As a numerical example, the 3 span Extradosed bridge which is expected to be installed in Ho-Nam high speed railroad is considered. The analysis results show that the example bridge satisfies the criteria of dynamic stability.

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A Fuzzy Dispatching Algorithm with Adaptive Control Rule for Automated Guided Vehicle System in Job Shop Environment (AGV시스템에서 적응 규칙을 갖는 퍼지 급송알고리듬에 관한 연구)

  • 김대범
    • Journal of the Korea Society for Simulation
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    • v.9 no.1
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    • pp.21-38
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    • 2000
  • A fuzzy dispatching algorithm with adaptable control scheme is proposed for more flexible and adaptable operation of AGV system. The basic idea of the algorithm is prioritization of all move requests based on the fuzzy urgency. The fuzzy urgency is measured by the fuzzy multi-criteria decision-making method, utilizing the relevant information such as incoming and outgoing buffer status, elapsed time of move request, and AGV traveling distance. At every dispatching decision point, the algorithm prioritizes all move requests based on the fuzzy urgency. The performance of the proposed algorithm is compared with several dispatching algorithms in terms of system throughput in a hypothetical job shop environment. Simulation experiments are carried out varying the level of criticality ratio of AGVs , the numbers of AGVs, and the buffer capacities. The rule presented in this study appears to be more effective for dispatching AGVs than the other rules.

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Multi-Attribute Decision Model for the Justification of Local Area Network Architectures (근거리정보통신망 구성형태의 타당성평가를 위한 다속성 의사결정모델)

  • 김성집;양태곤;김낙현
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.19 no.38
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    • pp.51-60
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    • 1996
  • There is a general challenge offered to the field of engineering economics by the introduction of advanced technologies. A survey of the existing literature on evaluation of advanced information and manufacturing system indicate that the traditional approaches are inadequate for economic evaluation techniques used in its appraisal, difficulty in evaluating the potential benefits and criteria used to assess management performance. In this paper, an attempt has been made to overcome the above deficiencies by presenting an approach to account for the justification and selection of the Local Area Network(LAN) architectures. This is based on the Analytic Hierarchy Process(AHP) and is capable of taking into account many intangible factors as well. The usefulness of the proposed approach is demonstrated through a case situation and sensitivity analysis. Finally, some research directions for future work are identified.

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Application of An Analytical Hierarchy Process to Set Priorities on Standardization Work Items of Next Generation Internet Protocol Television (차세대 IPTV 표준화 항목 우선순위 결정을 위한 계층분석방법 응용)

  • Woo, Hoon-Shik
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.33 no.3
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    • pp.192-198
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    • 2010
  • To maximize effectiveness of standardization activities, it is essential to set priorities for determined standardization work items in the next generation internet protocol television (NG-IPTV) technologies. In this study, the analytic hierarchy process(AHP) is employed and applied to ranking of NG-IPTV standardization work items as a multi-criteria decision making tool which involves comprehensive surveys. Survey results are analyzed and we identified a useful three level segmentation of standardization strategic plan which shows standardization work item priorities.

Applications of a Methodology for the Analysis of Learning Trends in Nuclear Power Plants

  • Cho, Hang-Youn;Park, Sung-Nam;Yun, Won-Yong
    • Proceedings of the Korean Nuclear Society Conference
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    • 1995.10a
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    • pp.293-299
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    • 1995
  • A methodology is applied to identify tile learning trend related to the safety and availability of U.S. commercial nuclear power plants. The application is intended to aid in reducing likelihood of human errors. To assure that tile methodology ran be easily adapted to various types of classification schemes of operation data, a data bank classified by the Transient Analysis Classification and Evaluation(TRACE) scheme is selected for the methodology. The significance criteria for human-initiated events affecting tile systems and for events caused by human deficiencies were used. Clustering analysis was used to identify the learning trend in multi-dimensional histograms. A computer rode is developed based on tile K-Means algorithm and applied to find the learning period in which error rates are monotonously decreasing with plant age.

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A Study of High-speed Vacuum Balancing for 38M6 Recycle Compressor (38M6 리사이클 Compressor의 고속진동 밸런싱 사례연구)

  • 이동환;김병옥;이안성
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.05a
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    • pp.657-662
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    • 2004
  • This paper presented is a case study of a real compressor rotor of a refinery plant for high speed balancing of flexible rotor. The rotor was tested in the expert high-speed balancing facility established by KIMM at early 2004. The capability of the facility can reach 40000rpm in rotation speed and 8 ton in rotor weight for high-speed balancing. The facility performs multi-plane at-speed balancing using influence coefficient from the vibration data measured at two pedestals. The test rotor had exceeded permissible criteria of vibration at initial run. But by processing a low-speed balancing at 1000 rpm and six trial run trying to calculate influence coefficient of rotor to the range of operating speed, the final result of high-speed balancing revealed a remarkable reduce of vibration at pedestal of the rotor.

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Dynamic Analysis of Railway Vehicle Having Single Axle Bogie (1축 대차용 철도차량의 동특성 해석)

  • Yang, Hee-Joo;Oh, Taek-Yul
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.3
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    • pp.84-89
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    • 2001
  • Studied in this paper was the vehicle dynamics simulation for development of single axle bogie using the multi-body dynamics simulation program(VAMPIRE). Single axle bogie vehicle is to the crew of freight vehicle. Method of analysis for dynamic behaviors of vehicle having single axle bogie was carried by UIC(International Union of Railways) code 518 and results of analysis were presented in terms of the hunting stability and the derailment ratio and the sum of wheel/rail lateral force. The results of analysis meet the criteria proposed by UIC.

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Exploring the Applicability of the School Adjustment Test for Children (초등학생용 학교생활적응 검사의 활용가능성)

  • Kim, Yeong-Eun
    • The Korean Journal of Elementary Counseling
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    • v.7 no.1
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    • pp.165-181
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    • 2008
  • In this study, a preliminary study has been made to check the availability of examination after selecting one among the criteria to adaptation of school life, in recognition of the necessity for a tool in order to collect multi =dimensional information about children. An examination has been done with the survey target of 291 pupils in the fifth and sixth grade in an elementary school located in Incheon. And the focus group with the teachers in charge of each class was undertaken to check the availability of the examination. As the result of the examination, 37 was the average score of children diagnosed as the category of temporary maladaptation in terms of the score of 4 sub-scales of school adaptation and their total scores, and 28 was the score which corresponds to the assessment of teachers. The results of examinations and the evaluations of teachers were proved to be highly correlated. Lastly discussion is focused on the meaning of these findings and the suggestions for the further studies.

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A Feasibility Study Method for Apartment Remodeling by Hedonic Model (헤도닉 모델을 활용한 공동주택 리모델링 사업성 평가방법)

  • Yu, In-Geun;Kim, Cheon-Hak;Yun, Yeo-Wan;Yang, Geuk-Yeong
    • Journal of the Korea Institute of Building Construction
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    • v.4 no.3
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    • pp.117-124
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    • 2004
  • This study aims to evaluate the feasibility of remodeling business by predicting the future price of apartment house after remodeling using Hedonic Price Model. The data concerning such 8 independent variables as location, unit size, unit plan, landscape, parking, the number of elapsed years after completion, number of units, brand per apartment unit from 25 regions in Seoul metropolitan city were collected and evaluated by established evaluation criteria. The coefficients affecting the price of apartment unit were made by way of linear multi-regression and put into Hedonic Price Model. The feasibility evaluation model for apartment was made and verified by data of remodelled apartment. The predicted results using suggested evaluation model coincide with actual apartment market situations.