• Title/Summary/Keyword: Assessing

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Interaction effect of Chemical Mixtures (혼합물에서 화학물질간의 상호작용 효과)

  • Leem Jong Han;Shin Joo-Youn;Kim Yong-Kyu
    • Journal of The Korean Society of Clinical Toxicology
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    • v.3 no.1
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    • pp.11-16
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    • 2005
  • Chemical mixtures of components, each of which are present at less than guidance concentrations, may be hazardous due to additivity, interactions, or both. Toxicological interactions may increase the health hazard above what would be expected from an assessment of each component singly, or all components additively. So chemical mixture are a particular issue in public health. There are several approach to assess whether there are additivity or interaction in assessing toxicological effects, such as, components-based approach, physiologically-based pharmacokinetic /pharmacodynamic(PBPK/PD) models, hazard index method, and weight-of evidence method. If we consider interaction or additivity effects in assessing the health effects of chemcial mixtures, we can get more accurate information about toxicological effects and dose-response relationship in chemical mixtures.

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A Simple Method for Assessing Severity of Common Root Rot on Barley

  • Arabi, Mohammad Imad Eddin;Jawhar, Mohammad
    • The Plant Pathology Journal
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    • v.29 no.4
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    • pp.451-453
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    • 2013
  • Common root rot caused by Cochliobolus sativus is a serious disease of barley. A simple and reliable method for assessing this disease would enhance our capacity in identifying resistance sources and developing resistant barley cultivars. In searching for such a method, a conidial suspension of C. sativus was dropped onto sterilized elongated subcrown internodes and incubated in sandwich filter paper using polyethylene transparent envelopes. Initial disease symptoms were easily detected after 48h of inoculation. Highly significant correlation coefficients were found in each experiment (A, B and C) between sandwich filter paper and seedling assays, indicating that this testing procedure was reliable. The method presented facilitates a rapid pre-selection under uniform conditions which is of importance from a breeder's point of view.

A Constructivist Science Learning Environment Survey for Korean Pre-service Elementary School Teachers (교육대학교 학생의 구성주의 과학 학습 환경에 대한 인식 조사)

  • Kwon, Sunggi
    • Journal of Korean Elementary Science Education
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    • v.32 no.2
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    • pp.198-205
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    • 2013
  • For assessing classroom environment, numerous instruments were developed and reported the survey results for science students in science education. In this study I translated Constructivist Learning Environment Scales (CLES) were into Korean versions for elementary school teachers, and measured the reliability. The subjects were randomly selected from three departments of an University of Education in a metropolitan city. All of them were 110 students, who would be elementary school teachers. According to the survey results, pre-service teachers for elementary school have recognized constructivistly for learning environments in an actual forms. In a scale of student negotiation they have most constructivistly recognized learning environment, and moderately in scales of relevance, uncertainty and critical view while they have seldom constructivistly recognized in a scale of shared control. Also Korean version CLES would be an reliable instruments for constructivist assessing learning environments.

A Study on Standard of Performance Evaluation for Paper Shredder (문서세단기 성능평가방법의 표준화에 관한 연구)

  • 이동규;유송민;이위로;노대호;김민호
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.10a
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    • pp.122-127
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    • 2004
  • The purpose of this study is to introduce the standard of the durability and evaluation method for paper shredder. The major evaluation criteria include shredding capability, shredding blade (or cutter) hardness and edge roughness, and durability. Due to the difficulties in assessing the durability directly, performance deterioration of the shredder was assessed by measuring the torque variation along with the variation in shredded chip size and load, thereby proposing the indirect method of assessing the paper shredder durability.

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A Study on the Vulnerability Assessment Model for National Defense Intelligence System Using SNA (사회연결망분석 개념을 적용한 국방정보체계 취약점 분석·평가 모형 연구)

  • Jang, Youngcheon;Kang, Kyongran;Choi, Bongwan
    • Journal of the Korea Institute of Military Science and Technology
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    • v.20 no.3
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    • pp.421-430
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    • 2017
  • In this research, we propose a methodology for assessing security vulnerability of the national defense intelligence system, considering not only target elements but also the interconnection relationship of the whole system. Existing approaches decide the security vulnerability of the whole system by assessing only target elements. However, those approaches have an issue with potentially showing the same outcome for the systems that have identical target elements but the different types of interconnection relationships. We propose a more practical assessment method which takes the interconnection relationship of a whole system into consideration based on the concept of SNA(Social Network Analysis).

An Applied Study of the Analytic Network Process to Assess Country Conditions for Korean Steel Exports

  • Cho, Keun-Tae;Hong, Soon-Wook
    • Journal of the Korean Operations Research and Management Science Society
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    • v.23 no.3
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    • pp.209-233
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    • 1998
  • In this study, we demonstrate how the Analytic Network Process (ANP) model which is combined with Michael Porter's diamond framework can be used for assessing conditions of selected countries : Brazil. India and China for Korean steel exports. The problem of assessing country conditions requires a model that evaluates several factors on different dimensions. Those dimensions are needed for ranking them according to their likeliness of being a target for Korean steel exports. The ANP consists of four kinds of dimensions called control hierarchy : benefits, opportunities, costs, risks, each of which represents the relationship of its own clusters and elements. To develop the clusters and elements of each dimension, Porter's diamond framework will be used. The final results show that China is the most attractive country to export steel, followed by Brazil and India. This is consistent with the information that we found with respect to the elements that were taken into consideration.

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ASSESSING POPULATION BIOEQUIVALENCE IN A $2{\times}2$ CROSSOVER DESIGN WITH CARRYOVER EFFECT IN A BAYESIAN PERSPECTIVE

  • Oh Hyun-Sook
    • Journal of the Korean Statistical Society
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    • v.35 no.3
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    • pp.239-250
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    • 2006
  • A $2{\times}2$ crossover design including carryover effect is considered for assessment of population bioequivalence of two drug formulations in a Bayesian framework. In classical analysis, it is complex to deal with the carryover effect since the estimate of the drug effect is biased in the presence of a carryover effect. The proposed method in this article uses uninformative priors and vague proper priors for objectiveness of priors and the posterior probability distribution of the parameters of interest is derived with given priors. The posterior probabilities of the hypotheses for assessing population bioequivalence are evaluated based on a Markov chain Monte Carlo simulation method. An example with real data set is given for illustration.

Porewater Pressure Predictions on Hillside Slopes for Assessing Landslide Risks(III)-Model Parameter Identification- (산사태 위험도 추정을 위한 간극수압 예측에 관한 연구 (III)-모델 매개변수 분석-)

  • 이인모;박경호
    • Geotechnical Engineering
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    • v.8 no.4
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    • pp.41-50
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    • 1992
  • In general, the conceptual lumped-parameter groundwater flow model to predict the groundwater fluctuations in hillside slopes has unknown model parameters to be estimated from the known input -output data. The purpose of this study is to estimate the optimal model parameters of the groundwater flow model developed by authors. The Mazilnum A Posteriori( MAP) estimation method is utilized for this purpose and it is applied to a site which shows the typical landslide in Korea. The result of application shows tllat the 반AP estimation method can estimate the unknown parameters properly well. The groundwater model developed along with estimation technique applied in this paper will be used for assessing risk of landslides.

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Economic Evaluation Method for Marine Electric Generating Systems Using a Comprehensive Economic Index (종합 경제성 평가지수에 의한 선박 발전장치의 경제성평가법)

  • Jeong-Je Kim;Seung-Taek Chang
    • Journal of the Society of Naval Architects of Korea
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    • v.30 no.1
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    • pp.10-19
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    • 1993
  • Design optimisation generally necessitates a tool of assessing the economics of designs. This paper proposes a method of assessing the economics of marine electric generating systems. The pay back period(PBP) and the net present valuve(NPV) of the investment for a designed project are properly converted into a economic index. The mechanical factors dominating the easiness in operating the system are also assessed and quantified to form a index which eventually is added to the economic index producing a comprehensive economic index. The method has been tested on a design example and it's validity has been shown.

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ASSESSING AND ADDRESSING INCREASED STAKEHOLDER AND OPERATOR INFORMATION NEEDS IN NUCLEAR FUEL CYCLE FACILITIES: TWO CONCEPTS

  • Saltiel, David H.
    • Nuclear Engineering and Technology
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    • v.39 no.6
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    • pp.691-696
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    • 2007
  • Nuclear energy programs around the world increasingly find themselves at the nexus of potentially conflicting demands from both domestic and international stakeholders. On one side, the rapid growth in demand for electricity coupled with the goal of reducing carbon emissions calls for a significant expansion of nuclear energy. On the other, stakeholders are seeking ever greater safety, environmental, security, and nonproliferation assurances before consenting to the construction of new nuclear energy facilities. Satisfying the demand for clean energy supplies will require nuclear energy operators to find new and innovative ways to build confidence among stakeholders. This paper discusses two related concepts which can contribute to meeting the needs of key stakeholders in cost effective and efficient ways. Structured processes and tools for assessing stakeholder needs can build trust and confidence while facilitating the "designing-in" of information collection systems for new facilities to achieve maximum efficiency and effectiveness. Integrated approaches to monitoring facilities and managing the resulting data can provide stakeholders with continued confidence while offering operators additional facility and process information to improve performance.