• Title/Summary/Keyword: Evaluating Method

Search Result 4,119, Processing Time 0.026 seconds

The Model of Decision Making and the Method of Evaluating Criteria and Alternatives by Value Judgement, In Case of the University Student's Housing Choice (가치 판단에 기초한 의사결정 모형과 기준.대안의 평가 방법: 대학생의 주택 선택을 사례로)

  • Park, Kyu-Taeg;Lee, Sang-Yool
    • Journal of the Korean association of regional geographers
    • /
    • v.9 no.2
    • /
    • pp.135-152
    • /
    • 2003
  • The purpose of this study is to suggest the model of supporting decision making and the method of evaluating criteria and alternatives by value judgement and to apply the model and method suggested to the case of the University Student's housing choice. The criteria and alternatives are evaluated in terms of intuitive judgement and the Analytic Hierarchy Process(AHP). The university students of the Daegu Metropolitan area consider the socioeconomic and environmental factors more important than the characteristics of housing to evaluate their future housing types. In terms of the student's intuitive judgement, socio-educational environment, accessibility, economy, natural environment, and the characteristics of housing are considered in order as an important criteria of evaluating housing. The orders of the important criteria done by an intuitive judgement and the AHP are different. In terms of the AHP, apartment, detached dwelling, and row house are preferred in order as the student's future housing types. The orders of preferred housing types are, however, dynamically changed based on specific criteria. In sum, the model of decision making and the method of evaluating criteria and alternatives by value judgement will be applied to the real problems defined by uncertainty and high risk.

  • PDF

A Quantitative Evaluation on Steel Corrosion by Polarization Resistance Method (분극저항법에 의한 철근부식의 정량적 평가)

  • 정우용;손영무;윤영수;변근주
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2000.04a
    • /
    • pp.688-693
    • /
    • 2000
  • Recently great efforts and investment have been made in order to evaluate concrete durability by steel corrosion. But most of study is relatively or qualitatively estimated, therefore it has a great limitation in evaluating a remaining service life of concrete. In this research, steel corrosion rate was measured quantitatively by polarization resistance method and multi-regressed considering chloride, carbonation, coverage depth, relative humidity, W/C, and the use of deicing salts. And a half cell potential method was used at th same time for the purpose of comparing with polarization resistance method.

  • PDF

New Developments in Power Reactor Core Design

  • Johnson, R.D.
    • Nuclear Engineering and Technology
    • /
    • v.4 no.2
    • /
    • pp.137-150
    • /
    • 1972
  • Three recently introduced tenchniques in the area of nuclear analysis are discussed : the structure-factor method of evaluating group material properties, the vector-synthesis method of generating three-dimensional multigroup flux distributions, and an indirect method of defining optimal restricted partitions of neutron phase-space. Each new method is compared with other commonly employed techniques and is shown to be a simplification which leads to a reductions in computational effort while retaining acceptable accuracy.

  • PDF

Development of Tomographic SASW Method to Evaluate Two-Dimensional Variability of Shear Stiffness (지반 및 구조물의 이차원적 전단강성 평가를 위한 토모그래픽 SASW 기법의 개발)

  • 조성호
    • Journal of the Korean Geotechnical Society
    • /
    • v.15 no.2
    • /
    • pp.29-42
    • /
    • 1999
  • The SASW (Spectral-Analysis-of-Surface-Waves) method, which evaluates the stiffness structure of the subsurface and structures nonintrusively and nondestructively, has been successfully used in the civil engineering applications. However, the SASW method assumes that the subsurface or structures consist of horizontal multi-layers, so that the method has some difficulty in continuously evaluating the integrity of a tunnel lining and a pavement system. This difficulty prevents the SASW method from being used to generate a tomographic image of stiffness for the subsurface or structures. Recently, the GPR technique which has the advantage of continuously evaluating integrity of the subsurface and structures has been popular. This advantage of GPR technique initiated the efforts to make the SASW method, which is superior to GPR and other nondestructive testing methods due to its capability of evaluating stiffness and modulus, be able to do continuous evaluation of stiffness structure, and the efforts finally lead to the development of \ulcornerTomographic SASW Technique.\ulcorner Tomographic SASW technique is a variation of the SASW method, and can generate a tomographic image of stiffness structure along the measurement line. The tomographic SASW technique was applied to the investigation of lateral variability of a sand box placed by the raining method for the purpose of verifying its effectiveness. Tomographic SASW measurements on the sand box revealed that the investigated sand box has different shear stiffness along the measurement line, which gave a clue of how to make a better raining device.

  • PDF

The Evaluation Method of Software Usability based on UI (UI 중심의 소프트웨어 사용성 평가 방법)

  • Lee, Ha-Young;Yang, Hae-Sool
    • Journal of Digital Convergence
    • /
    • v.11 no.5
    • /
    • pp.105-117
    • /
    • 2013
  • Viewpoint about the quality of software is various. But, from the end-user point of view, user interface of software may be all to express the quality of software. But the detailed evaluation criteria were not established about usability evaluation method based on user interface so far, though user interface of software is the main object of usability quality characteristics. In this paper, we established a system about the method extracting and evaluating some quality characteristics elements measurable form user interface of software by analyzing the relationship between the elements constructing quality characteristics and user interface related to quality evaluation of software. We expect that this result of study will be a fundamental study adapting and evaluating to various types of user interface.

Grouting effects evaluation of water-rich faults and its engineering application in Qingdao Jiaozhou Bay Subsea Tunnel, China

  • Zhang, Jian;Li, Shucai;Li, Liping;Zhang, Qianqing;Xu, Zhenhao;Wu, Jing;He, Peng
    • Geomechanics and Engineering
    • /
    • v.12 no.1
    • /
    • pp.35-52
    • /
    • 2017
  • In order to evaluate the grouting effects of water-rich fault in tunnels systematically, a feasible and scientific method is introduced based on the extension theory. First, eight main influencing factors are chosen as evaluation indexes by analyzing the changes of permeability, mechanical properties and deformation of surrounding rocks. The model of evaluating grouting effects based on the extension theory is established following this. According to four quality grades of grouting effects, normalization of evaluation indexes is carried out, aiming to meet the requirement of extension theory on data format. The index weight is allocated by adopting the entropy method. Finally, the model is applied to the grouting effects evaluation in water-rich fault F4-4 of Qingdao Jiaozhou Bay Subsea Tunnel, China. The evaluation results are in good agreement with the test results on the site, which shows that the evaluation model is feasible in this field, providing a powerful tool for systematically evaluating the grouting effects of water-rich fault in tunnels.

Approach for Evaluating the Nash Equilibrium of Cournot Game Model for N-Gencos by Using Payoff Matrix in Wholesale Electricity Market (도매전력시장에서 N-발전사업자의 보수행렬을 이용한 꾸르노 모델의 내쉬균형점 도출을 위한 방법론)

  • Park Jong-Bae;Lim Jung-Youl;Lee Ki-Song;Shin Joong-Rin
    • The Transactions of the Korean Institute of Electrical Engineers A
    • /
    • v.54 no.2
    • /
    • pp.97-106
    • /
    • 2005
  • This paper presents a method for evaluating the nash equilibrium of the Cournot model for N-Gencos in wholesale electricity market. In wholesale electricity market, the strategies of N-Gencos can be applied to the game model under the conditions, which the Gencos determine their strategies to maximize their benefit. Generally, the Lemke algorithm has known as the approach to evaluate the mixed nash equilibrium in the only two-player game model. In this paper, we have developed the necessary condition for obtaining the mixed nash equilibrium of N-player by using the Lemke algorithms. However, it is difficult to find the mixed nash equilibrium of two more players by using the analytic method since those have the nonlinear characteristics. To overcome the above problem, we have formulated the object function satisfied with the proposed necessary conditions for N-player nash equilibrium and applied the modified particle swarm optimization (PSO) method to obtain the equilibrium for N-player. To present the effectiveness the proposed necessary condition and the evaluation approach, this paper has shown the results of equilibrium of sample system and the cournot game model for 3-players.

Development of Non-contact Image Measuring Technique for Evaluating Micro-relief (미세주름 측정을 위한 비접촉식 영상측정기술의 발전)

  • Kim, Nam-Soo;Kim, Yong-Min
    • Journal of the Society of Cosmetic Scientists of Korea
    • /
    • v.31 no.3 s.52
    • /
    • pp.253-257
    • /
    • 2005
  • Assurance of the objectivity and reproducibility is a major key point in wrinkle measurement used for evaluating the degree of skin aging. The measurement of relief is quickly converted to a non-contact method, of which tools or instruments do not come in contact with skin directly, to minimize the artificial effects which influence the shape or depth of the relief. Here, we showed how wrinkle measurement techniques have been changed briefly and compared PRIMOS and replica method in the point of view of measurement principle and features, the former is non-contact fringe projection tool and the latter is contact type of the method.

Experimental Method for Evaluating Debonding Strength of FRPs Used for Retrofitting Concrete Structures (콘크리트 휨부재 보강용 FRP의 부착성능 평가를 위한 실험방법 연구)

  • Utui, Nadia;Kim, Hee-Sun
    • Journal of the Korean Society for Advanced Composite Structures
    • /
    • v.2 no.3
    • /
    • pp.36-41
    • /
    • 2011
  • This study proposes a experimental method to evaluate bonding strength of FRPs used for retrofitting concrete structures. Specimens are designed so that debonding failure of FRPs can be induced from reinforced concrete beams retrofitted with two layers of carbon and glass FRPs. And three-point loading tests are performed to see if debonding failure with proper debonding strength is observed from the specimens. The test results show that the tested beams are failed due to debonding of FRPs, therefore, the proposed test method is capable of evaluating debonding strength of FRPs using relatively small normal strength concrete beams.

An Experimental Study on Evaluation of Compressive Strength in Cement Mortar Using Averaged Electromagnetic Properties

  • Kwon, Seung-Jun;Maria, Q. Feng;Park, Tae-Won;Na, Ung-Jin
    • International Journal of Concrete Structures and Materials
    • /
    • v.3 no.1
    • /
    • pp.25-32
    • /
    • 2009
  • A non-destructive testing (NDT) method for evaluating physical properties of concrete including the compressive strength is highly desirable. This paper presents such an NDT method based on measurement of electromagnetic (EM) properties of the material. Experiments are carried out on cement mortar with different water/cement (W/C) ratios. Their EM properties including the conductivity and the dielectric constant are measured at different exposure conditions and curing periods over a wide frequency range of the EM wave. The compressive strength of these specimens is also tested. It is found that both the conductivity and the dielectric constant increase as the W/C ratio decreases and the curing period increases, which lead strength development in the specimens. A linear correlation is observed between the averaged EM properties over the 5 to 20 GHz frequency range and the measured compressive strength, demonstrating the effectiveness of the EM property-based NDT method in evaluating strength of OPC mortar.