• Composites Research
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• v.23 no.2
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• pp.40-47
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• 2010

In this paper, the hybrid response surface method(HRSM) is proposed and examined. Hybrid response surface method calculate a approximate model repeatedly based on MPP coordinates. To verify the performance, probability of failure, MPP(Most Probable failure Point) and reliability index are calculated for nonlinear function and composite laminated plate by using reliability analysis method and compared with results by using typical response surface method(RSM). Probability of failure is calculated under the assumption of the nonlinear limit state equation and given failure criterion. The results of proposed method shows performance improvement in estimating the probability of failure.

• Journal of the Korea institute for structural maintenance and inspection
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• v.17 no.1
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• pp.1-9
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• 2013

In this study of Eccentric Braced Frames have identified the following target eccentricity on the length of the inelastic behavior of the reaction by calculating the correction factor by comparing it to the value suggested by the earthquake provided material for the rational design aims to There are. As a variable-length V-braced frame analysis model stations were set up. Eccentricity faults in the model according to the length stiffness ratio, the maximum amount of energy dissipation were analyzed base shear and multi-layered model of the reaction from the eccentricity correction factor calculated on the length of the building standards proposed by KBC 2009 in response eccentricity correction factor calculated from The length varies. does not have the same response modification factor was confirmed.

• Journal of the Korean Institute of Gas
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• v.27 no.3
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• pp.108-115
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• 2023

Although hydrazine is an excellent liquid propellant, caution is required during storage and handling due to its high toxicity and reactivity. Safety guidelines should be established in consideration of the chemical reactivity by unintended leakage. In this study, the status of hydrazine facilities at launch site and safety standards for storing and handling were investigated and then, the reactivity between chemicals and hydrazine was analyzed. As a result of the analysis, hydrazine has reactivity with the exception of fuel oil. This paper emphasizes the imperative nature of constructing a dedicated hydrazine storage facility. Ensuring compatibility between hydrazine and the materials used in storage containers and handling equipment is crucial to prevent undesired reactions that could compromise safety. It was intended to be used as basic data to secure the range safety when handling hydrazine.

• The Korean Journal of Applied Statistics
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• v.26 no.3
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• pp.453-470
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• 2013

In this paper, we consider a Bayesian analysis of the dose-effect relationship of cadmium to evaluate a benchmark dose(BMD). For this purpose, two dose-response curves commonly used in the toxicity study are fitted based on Bayesian methods to the data collected from the scientific literature on cadmium toxicity. Specifically, Bayesian meta-analysis and hierarchical modeling build an overall dose-effect relationship that use a piecewise linear model and Hill model, where the inter-study heterogeneity and inter-individual variability of dose and effect such as gender, age and ethnicity are accounted. Estimation of the unknown parameters is made by using a Markov chain Monte Carlo algorithm based user-friendly software WinBUGS. Benchmark dose estimates are evaluated for various cut-offs and compared with different tested subpopulations with with gender, age and ethnicity based on these two Bayesian hierarchical models.

• Journal of the Korean Vacuum Society
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• v.2 no.1
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• pp.50-57
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• 1993

이원계 박막확산쌍에서 열처리 방법에 의한 고상 비정질화 반응의 경향성을 예측하기 위하여 유효 구동력 개념을 제시하였다. 고상 비정질화 반응은 두 원소의 물리적 혼합물과 비정질상간의 최대 자유에너지차로 주어지는 열역학적 구동력(ΔGmax)과 확산원소의 원자반경에 대한 기지의 유효 침입형자리 반경의 비로 주어지는 구조적 요소(Rm/d)가 충족될 때 일어나는 빠른 확산에 의하여 발생된다고 고찰하고, 유효 구동력 기준을 이용하여 금속/금속계 뿐만 아니라 금속/실리콘 계의 고상반응에 의한 비정질상 생성 경향성을 예측하고 실험결과들과 비교하여 잘 적용됨을 보였다. 또한, 유효 구동력 기준이 금속/실리콘 계에서 비정질상의 임계 성장두께 경향성의 예측에도 잘 적용됨을 보였다.

• Korean Journal of Cognitive Science
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• v.26 no.3
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• pp.357-375
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• 2015

In our daily life, the probability of target prevalence in visual search varies from very low to high. However, most laboratory studies of visual search used a fixed probability of target prevalence at 50%. The present study examined the properties of information processing during visual search where the probability of target prevalence was manipulated to vary from low (20%), medium (50%), to high (80%). The search items were made of simple shape stimuli, and search accuracy, signal detection measures, and reaction times (RTs) were analyzed for characterizing the effect of target prevalence on the information processing strategies for visual search. The analyses showed that the rates of misses increased whereas those of false alarms decreased in the search condition of low target prevalence, whereas the pattern was reversed in the high prevalence condition. Signal detection measures revealed that the target prevalence shifted response criterion (c) without affecting sensitivity (d'). In addition, RTs for correct rejection responses in the target-absent trials became delayed as the prevalence increased, whereas those for hits in the target-present trials were relatively constant regardless of the prevalence. The RT delay in the target-absent trials indicates that increased target prevalence made the 'quitting threshold' for search termination more conservative. These results support an account that the target prevalence effect in visual search arises from a shift of decision criteria and the subsequent changes in search information processing, while rejecting the account of a speed-accuracy tradeoff.

• KOREAN POULTRY JOURNAL
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• v.33 no.11 s.385
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• pp.128-129
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• 2001

우리가 흔히 사용하고 있는 NRC는 가장 이상적인 관리상태에서 건강한 닭들을 기준으로 정해졌기 때문에 실제 상황에서는 조정적용이 필요하다. 면역계의 발달과 관련된 영양소들은 특히 신경을 써야 하는데, 탄수화물, 지방, 단백질과 같은 macro nutrient 나 비타민, 광물질, 필수아미노산과 같은 micro nutrient대부분의 영양소들은 면역 반응에 밀접한 영향을 주게된다.

• The Journal of the Acoustical Society of Korea
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• v.11 no.1E
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• pp.64-72
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• 1992

본 연구는 음장의 주관 확산감과 관련있는 두 귀에 입사하는 신호의 상호상관도와 청각유발 반 응과의 관계를 밝히기 위한 것이다. 실험은 중신 주파수가 500Hz인 1/3옥타브 대역잡음을 이용하여 IACC를 0.95에서 0.1까지 가변시키면서 AER을 기록하였다. IACC와 주관확산감과의 함수 결과와 비교 하기 위하여 기준음과 테스트음의 쌍을 교대로 제시하면서 AER을 청각 부위에서 기록하였다. 그 결과 테스트음에 대해 IACC와 관련된 정보는 AER의 반응시간에 나타났고, IACC의 크기가 감소함에 따라 반응시간이 길어지는 경향이 나타났다. 여기에서 IACC와 AER의 반응시간과는 선형관계를 나타냈다. 이 결과는 청각계에서 음장의 IACCDP 반응하는 뉴런이나 메카니즘이 존재하는 것을 암시하고 있음을 알 수 있다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.11a
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• pp.135-136
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• 2002

최근 들어, 대도시 지역에서 오존(O$_3$)농도가 환경기준을 초과하는 빈도가 증가함에 따라 대기 중 광화학 대기오염현상과 그에 따른 오존 등 2차 광화학 오염물질에 대해 많은 관심이 집중되고 있다. 이러한 복잡한 대기중의 반응을 이해하고 해석하기 위하여 Smog Chamber를 이용한 대기 중 광화학 반응 연구가 진행 중에 있으며, 국내에서도 연구가 이루어지고 있다 Smog Chamber를 통해 대기 중의 광화학 반응의 세부적인 이해와 수학적 모델에 필요한 화학반응들의 변수를 제공하는 등 포괄적이고 종합적인 연구를 수행할 수 있다. (중략)

• Feed Journal
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• v.2 no.10
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• pp.78-82
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• 2004

최근 웰빙(well-being) 바람과 함께 유기농축산물에 대한 소비자의 관심이 고조되고 있다. 그러나 국내에서 유기농축산물에 대한 인증기준은 아직 미비한 실정이어서 특히 국내산 유기축산물은 찾아볼 수 없다. 농산물의 경우, 유기농산물, 전환기유기농산물, 무농약농산물, 저농약농산물로 인증 표시가 되어 있으며, 축산물은 유기축산물, 전환기유기축산물로 표시기준은 있으나 구체적인 인증기준이 마련되어 있지 않은 실정이다.(중략)