• 한국산업융합학회 논문집
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• 제4권2호
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• pp.119-125
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• 2001

This paper discuss the Qualification Test Procedure which is composed of main functional and environmental tests for the localizing avionics and subsystems, especially the detail test approaches of General Avionics Computed(GAC) through the analysis of related technical data packages for the purpose of performance proof of final products. Quality assurance procedures are properly established with the several kinds of inspections and functional test items. They are called as process inspections, functional test, acceptance test procedure and qualification test procedure. The Qualification test procedure are composed of the analysis of original engineering design concept and shall be performed for the acquisition of the certification of the GAC's quality as well as the aquisition of the related techniques and engineering know-how items.

• 한국생산제조학회지
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• 제24권3호
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• pp.355-362
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• 2015

Test procedure for the design verification of wind turbine pitch and yaw bearings has been developed. Test items were selected to evaluate operational reliability of pitch and yaw bearings by considering loading and operational conditions, and by analyzing the design criteria of pitch and yaw bearings. The developed test items consisted of preliminary test, fatigue load test, extreme load test, low temperature environmental test and dismantling inspection after all the test were completed. Because it reflects the actual operational conditions of the pitch and yaw bearings, the developed test procedure has high reliability and can verify the basic design considerations in the international standard and guidelines.

• 한국항공운항학회지
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• 제25권4호
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• pp.170-176
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• 2017

In recent years, Unmanned Aerial Vehicles (UAVs) were actively developed in various fields. In development process of UAVs, flight test is performed to ensure that minimum safety requirements and technical requirements are met. By constructing flight test infrastructure such as takeoff and landing facilities, operation procedure, and equipments, flight test can be performed effectively. In this paper, operation procedures of civil UAV's flight test are proposed. The procedures proposed are composed by two main steps: first, planning and permitting procedure of flight test. Secondly, execution and control procedure of flight test.

• Communications for Statistical Applications and Methods
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• 제16권2호
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• pp.325-334
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• 2009

In this research, we propose a nonparametric test procedure for the right censored and grouped data under the additive hazards model. For deriving the test statistics, we use the likelihood principle. Then we illustrate proposed test with an example and compare the performance with other procedure by obtaining empirical powers. Finally we discuss some interesting features concerning the proposed test.

• 항공우주기술
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• 제8권2호
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• pp.170-178
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• 2009

위성 개발 및 운영의 주체가 달라서 이중으로 소모되는 에너지를 줄이기 위해 공통지상 시스템의 통합 개발이 절실히 필요하다. 위성의 개발, 시험, 통합, 발사, 궤도 운영, 임무 수행의 전주기를 아우르는 공통지상시스템을 개발하기 위해서는 모든 단계에서 사용될 수 있는 언어를 개발해야 한다. 이를 위해 위성 시험운영언어의 유럽표준인 PLUTO와 가장 대표적인 언어중 하나인 STOL과 ELISA 및 PIL과 현재 항공우주연구원 AIT의 위성 시험 언어인 ATS와 지상국 운영시스템인 MCE를 자세히 분석하고, 이를 토대로 통합 절차서 언어 개발을 위한 설계 요건들을 제안한다.

• Journal of the Korean Data and Information Science Society
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• 제20권1호
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• pp.237-250
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• 2009

We consider a nonparametric test procedure for the multi-sample problem with grouped data. We construct the test statistics based on the scores obtained from the likelihood ratio principle and derive the limiting distribution under the null hypothesis. Also we illustrate our procedure with an example and obtain the asymptotic properties under the Pitman translation alternatives. Also we discuss some concluding remarks. Finally we derive the covariance between components in the Appendix.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.1252-1257
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• 2003

This paper present a procedure of meter-out flow control method for dump valve in full-scale airframe test. Emergency stop, which results in dump state, can be happened during full-scale airframe test by several causes. Because servo valve can't control hydraulics actuator in the dump state, pressure in cylinder chamber may rise abruptly and overload can be acted to the test article. In this paper, the procedure and technology of orifice setting are investigated to protect the test article from unexpected loads by dump. The test results show that the presented methods decrease peak loads and improve unloading characteristics of hydraulic actuators in the dump state.

• 한국주조공학회지
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• 제34권4호
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• pp.136-142
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• 2014

Numerical solution of thermal stress by CAE analysis could be an effective method in product development stage of castings to predict and treat the problem of solidification cracking of castings. Quantitative stress-strain data are necessary, in this case. Tension type apparatus of a solidification crack test which can measure stress-strain relationship quantitatively was developed and the test procedure was established by this research. Solidification crack strength obtained from the following test procedure could be utilized to evaluate it in terms of effect factors on thermo-plastic characteristic of solidifying alloy such as grain size of solid, grain morphology, distribution of solid grain, etc. Proposed test procedure is as follow: Prediction of temperature at the failure site of solidification cracked specimen by computer simulation of solidification, Calculation of solid fraction of the failure site from thermodynamic solution of solidification under Scheil condition.

• Communications for Statistical Applications and Methods
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• 제25권5호
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• pp.559-568
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• 2018

Gene classification can involve complex order-restricted inference. Examining gene expression pattern across groups with order-restriction makes standard statistical inference ineffective and thus, requires different methods. For this problem, Roy's union-intersection principle has some merit. The M-estimator adjusting for outlier arrays in a microarray study produces a robust test statistic with distribution-insensitive clustering of genes. The M-estimator in conjunction with a union-intersection principle provides a nonstandard robust procedure. By exact permutation distribution theory, a conditionally distribution-free test based on the proposed test statistic generates corresponding p-values in a small sample size setup. We apply a false discovery rate (FDR) as a multiple testing procedure to p-values in simulated data and real microarray data. FDR procedure for proposed test statistics controls the FDR at all levels of ${\alpha}$ and ${\pi}_0$ (the proportion of true null); however, the FDR procedure for test statistics based upon normal theory (ANOVA) fails to control FDR.

• Communications for Statistical Applications and Methods
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• 제15권4호
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• pp.531-542
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• 2008

시계열 자료를 분석할 때, 시계열 자료가 가지고 있는 추세를 제거하기 위하여 결정적 추세인 경우 회귀모형을 이용하고, 확률적 추세인 경우 차분하는 방법을 이용한다. 이 때 제거의 옳바른 기준이 되는 검정 방법이 단위근 검정이다. 그러나 기존의 Dickey-Fuller 검정 (Dickey와 Fuller, 1979)은 표본 수가 작고, 단위근에 가까울 경우 검정력이 낮으며, 베이지안 단위근 검정은 절차가 복잡하다. 본 논문에서는 기존의 두 방법들의 문제점을 해결하기 위하여, 전통적 Dickey-Fuller 검정 방법과 베이지안 방법을 결합한 형태의 검정방법으로 제안하였다. 제안된 검정방법은 모형 AR(1)에서 계수가 거의 1이거나 표본 수가 작을 경우, 기존의 Dickey-Fuller 검정보다 검정력이 높을 뿐만 아니라 일반적인 베이지안 방법 보다 절차가 간단한 검정법이 된다.