• 품질경영학회지
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• 제45권3호
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• pp.533-547
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• 2017

Purpose: This study proposes the main sources of uncertainty and uncertainty analysis of a measurement system of insensitive munitions tests. Methods: We established the mathematical model for calculating measurement uncertainty of insensitive munitions tests, conducted experiments for calculating uncertainties of dynamic sensitivity and overshoot value, and estimated the distributions of uncertainty factors. Results: The measurement uncertainty calculation methods are presented, which include experimental data processing methods for calculating uncertainties of dynamic sensitivity and overshoot value. Conclusion: The measurement of explosion pressure in insensitive munitions tests is an important issue to the reporting test results and classifying reaction types. The more efforts to ensure the reliability of the insensitive munitions tests results are required.

• International Journal of Naval Architecture and Ocean Engineering
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• 제7권1호
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• pp.10-24
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• 2015

This study introduces a fatigue assessment procedure using mesh-insensitive structural stress method based on the Common Structural Rules for Bulk Carriers by considering important factors, such as mean stress and thickness effects. The fatigue assessment result of mesh-insensitive structural stress method have been compared with CSR procedure based on equivalent notch stress at major hot spot points in the area near the ballast hold for a 180 K bulk carrier. The possibility of implementing mesh-insensitive structural stress method in the fatigue assessment procedure for ship structures is discussed.

• 한국인터넷방송통신학회논문지
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• 제14권3호
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• pp.171-176
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• 2014

종방향 모드 전송선로 이론을 이용하여 이중 샌드위치 Rib-형 도파로에 기초한 초소형 편광 무의존성 방향성 결합기 (PIDC)의 편광특성을 자세하게 탐구하였다. 제안한 초소형 방향성 결합기의 편광 무의존성 조건을 얻기 위하여 샌드위치 rib형 도파로의 굴절률과 두께에 때라 변하는 quasi-TE 모드와 quasi-TM 모드의 결합길이와 결합효율을 분석하였다. 수치해석 결과, 수백 마이크로미터 크기의 초소형 편광 무의존성 방향성 결합기는 이중 샌드위치 층의 구조적, 물질적 변수들을 잘 선택함으로써 구현할 수 있음을 보였다. 또한, 이중 샌드위치 rib형 도파로에 분포하는 기본 모드의 프로필이 방향성 결합기의 성능에 어떤 영향을 미치는지에 대하여 조사하였다.

• 산업경영시스템학회지
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• 제43권4호
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• pp.107-115
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• 2020

Support vector regression (SVR) is devised to solve the regression problem by utilizing the excellent predictive power of Support Vector Machine. In particular, the ⲉ-insensitive loss function, which is a loss function often used in SVR, is a function thatdoes not generate penalties if the difference between the actual value and the estimated regression curve is within ⲉ. In most studies, the ⲉ-insensitive loss function is used symmetrically, and it is of interest to determine the value of ⲉ. In SVQR (Support Vector Quantile Regression), the asymmetry of the width of ⲉ and the slope of the penalty was controlled using the parameter p. However, the slope of the penalty is fixed according to the p value that determines the asymmetry of ⲉ. In this study, a new ε-insensitive loss function with p1 and p2 parameters was proposed. A new asymmetric SVR called GSVQR (Generalized Support Vector Quantile Regression) based on the new ε-insensitive loss function can control the asymmetry of the width of ⲉ and the slope of the penalty using the parameters p1 and p2, respectively. Moreover, the figures show that the asymmetry of the width of ⲉ and the slope of the penalty is controlled. Finally, through an experiment on a function, the accuracy of the existing symmetric Soft Margin, asymmetric SVQR, and asymmetric GSVQR was examined, and the characteristics of each were shown through figures.

• 전기의세계
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• 제28권1호
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• pp.67-72
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• 1979

The most difficult problem encountered in the DC Chopper is the improvement in it's output waveforms and the commutation failure. Thus, this paper deals with the Load Insensitive DC Chopper that produces a quasi-pure square wave over the entire load range, and doesn't fail the commutation. The authors compared voltage and current waveforms from the laboratory model with those from the computer simulation, and it's characteristics is discussed.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년도 제30회 춘계학술대회논문집
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• pp.213-216
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• 2008

예기치 않은 외적인 자극에 의한 사고를 막기 위하여 에너지 물질을 함유한 전술 유도무기의 위험성을 감소시킬 필요성이 증대되어, 유도무기 둔감화에 대한 연구가 미국과 나토에서 1980년대 후반부터 활발히 시작되었다. 로켓모터의 둔감성능을 향상시키기 위해서는 추진제를 비롯하여 로켓모터의 모든 부품들이 적절한 조합으로 각각의 특성을 살려 둔감성능 향상에 도움이 되도록 설계되어야 하며 각각의 부품이 어떤 역할을 하는지 이해하여야 한다. 고체 추진기관 둔감화에 필요한 중요한 역할을 하는 구성 요소는 추진제, 연소관, 점화기 및 완화장치 등이 있다.

• Journal of the Korean Data and Information Science Society
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• 제15권2호
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• pp.477-483
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• 2004

One of the major paradigms for supervised learning in neural network community is back-propagation learning. The standard implementations of back-propagation learning are optimal under the assumptions of identical and independent Gaussian noise. In this paper, for regression function estimation, we introduce $\varepsilon-insensitive$ back-propagation learning algorithm, which corresponds to minimizing the least absolute error. We compare this algorithm with support vector machine(SVM), which is another $\varepsilon-insensitive$ supervised learning algorithm and has been very successful in pattern recognition and function estimation problems. For comparison, we consider a more realistic model would allow the noise variance itself to depend on the input variables.

• Journal of electromagnetic engineering and science
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• 제18권2호
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• pp.129-135
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• 2018

This paper proposes a design of small controlled reception pattern antenna (CRPA) arrays using circular microstrip loops with frequency-insensitive characteristics. The proposed array consists of seven identical upper and lower circular loops that are electromagnetically coupled, which results in a frequency-insensitive behavior. To demonstrate the feasibility of the proposed feeding mechanism, the proposed array is fabricated, and its antenna characteristics are measured in a full-anechoic chamber. The operating principle of the proposed feeding mechanism is then interpreted using an equivalent circuit model, and the effectiveness of the circular loop shape is demonstrated by calculating near electromagnetic fields in proximity to the radiator. The results confirm that the proposed feeding mechanism is suitable to have frequency-insensitive behavior and induces strong electric and magnetic field strengths for higher radiation gain in extremely small antenna arrays.

• Bulletin of the Korean Chemical Society
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• 제30권5호
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• pp.1177-1180
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• 2009

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2006년도 제26회 춘계학술대회논문집
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• pp.77-80
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• 2006

고체 추진기관 둔감화는 고유 성능의 변화 없이 화재, 충격 등에 의한 우발적 사고시 반응의 정도를 최소화하는 기술로 정의된다. 열에 노출된 추진제가 점화되기 전에 연소관에 배기구가 형성되어, 추진기관 반응의 위험도를 낮추는 방법은 추진기관 둔감화의 핵심 기술 중 하나로, 이를 완화장치라 부른다. 본 논문은 완화장치와 관련된 최근의 연구 동향을 소개하였다.