• 한국군사과학기술학회지
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• 제23권4호
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• pp.389-398
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• 2020

Test cases in the existing weapon system software were created manually by the tester analyzing the test items defined in the software integration test procedure. However, existing test case generation method has two limitations. First, the quality of test cases can vary depending on the tester's ability to analyze the test items. Second, excessive time and cost may be incurred in writing test cases. This paper proposes a method to automatically generate test cases based on the requirements model and specifications to overcome the limitations of the existing weapon system software test case generation. Generate test sequences and test data based on the use case event model, a model representing the requirements of the weapon system software, and the use case specification specifying the requirements. The proposed method was applied to 8 target models constituting the avionics control system, producing 30 test sequences and 8 test data.

• Journal of the Korean Statistical Society
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• 제29권4호
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• pp.423-433
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• 2000

In this paper, we consider applying the bootstrap method to the median test procedures for right censored data. For doing this, we show that the median test statistics can be represented by the differences of two sampler medians. Then we review to the re-sampling methods for censored dta and propose the test procedures under the location translation assumption and Behrens-Fisher problem. Also we compare our procedures with other re-sampling method, which is so-called permutation test through an example. Finally we show the validity of bootstrap median test procedure in the appendix.

• 한국해양공학회지
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• 제16권6호
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• pp.25-31
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• 2002

A system identification method is introduced to increase the prediction accuracy of a ship's maneuverability in PMM test, analysis. To improve the accuracy of linear hydrodynamic coefficients, the analysis techniques of pure sway and yaw tests are developed, and confirmed. In the analysis of sway tests, accuracy to linear hydrodynamic coefficients depends on the frequency of sway motion. To obtain nonlinear hydrodynamic coefficients for large drift angles, a combined yaw test is introduced. Using this system identification method, runs of PMM test can be reduced while retaining sufficient accuracy, compared to the Fourier integration method. Through the comparisons with sea trial results and the Fourier integration method, the accuracy and efficiency of the newly proposed system identification method, based on least square method, has been validated.

• 한국음향학회지
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• 제37권4호
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• pp.233-241
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• 2018

본 논문에서는 기존에 없었던 도어트림 그립핸들에서 반복된 하중으로 인해 발생하는 소음을 사전에 검증할 수 있는 내구 시험법을 개발하고자 하였다. 시험 방법은 그립 핸들이 받는 하중 모드, 내구 횟수를 고려하여 개발하였으며, 시험 방법의 유효성을 확인하기 위해, 양산 초기 제품에 시험 법을 적용하여 필드클레임에서 발생한 도어트림 그립 핸들 소음을 재현하였다. 최종적으로, 현재 개발된 시험법을 통해서 후속 개발 제품의 소음 검출 및 개선하는 데 활용하고 있다.

• Nuclear Engineering and Technology
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• 제50권5호
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• pp.738-744
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• 2018

Fuel failure due to debris is a major cause of failure in pressurized water reactors. Fuel vendors have developed various filtering devices to reduce debris-induced failure and have evaluated filtering performance with their own test facilities and methods. Because of the different test facilities and methods, it is difficult to compare filtering performances objectively. This study presents an improved filtering test and an efficiency calculation method to fairly compare fuel-filtering efficiency regardless of the vendor's filtering features. To enhance the reliability of our evaluation, we established requirements for the test method and had a facility constructed according to the requirements. This article describes the debris specimens, the amount of debris, and the replicates for the proposed test method. A calculation method of comprehensive debris-filtering efficiency using a weighted mean is proposed. The test method was verified by repeated tests, and the tests were carried out using the PLUS7 and 17ACE7 test fuels to calculate the comprehensive debris-filtering efficiencies. The evaluation results revealed that the filtering performance of PLUS7 is better than that of 17ACE7. The proposed method can be used on any kind of debris-filtering devices and is appropriate for use as a standard.

• 대한전자공학회논문지
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• 제24권3호
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• pp.535-540
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• 1987

This paper proposes a circuit partitioning method and a multifunctional BILBO which can perform the multimodule test in the case of testing VLSI circuits. By using these circuit partitioning method and multifunctional BILBO, test time and cost can be reduced greatly by performing the pipeline test method. And the quantity of circuit that shold be added for testing is also reduced in half by interposing only one BILBO between each module. Also, we confirmed that the multifunctional BILBO proposed here has high error detection capability by analyzing error detection capability of this multifunctional BILBO in mathematics.

• Architectural research
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• 제20권4호
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• pp.137-145
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• 2018

The nondestructive test is widely used in the field of diagnosis and maintenance to evaluate the degree of damaging of structures caused by aging, and the demand for this test method is expected to continue increasing. However, there is a lack of standards related to the nondestructive test, and South Korea is relying heavily on developed nations for original technologies related to diagnosis. It is an urgent task to establish a nondestructive test method appropriate for the circumstance of South Korea. The purpose of this study is to compare and analyze estimated error of compressive strength in single-story structures comprised of vertical and horizontal reinforced concrete members using the impact testing method and rebound hardness method, which are nondestructive test methods, and to review on-site applicability of these methods. Based on compressive strength of the structures estimated, overall mean error was 21.2% for the impact testing method and 15.6% for the rebound hardness method. The necessity of a reliable diagnostic method based on compound nondestructive test methods to increase accuracy of estimation was confirmed.

• 한국멀티미디어학회논문지
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• 제10권7호
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• pp.912-922
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• 2007

원격교육 시스템의 평가 시스템에서 평가의 공정성을 위하여 매 평가 시 평가지의 난이도를 일정하게 유지할 수 있는 방법이 요구된다. 본 논문에서는 유전자 알고리즘 기반의 평가지 생성 알고리즘을 제안한다. 평가지의 각 문항에 대한 난이도가 제출자에 의해서 지정되는 기존의 방법과는 달리 제안한 알고리즘에서는 각 문항의 난이도가 학생들의 평가 결과에 따라 적응적으로 조절되고, 평가지의 평균 난이도를 일정한 수준으로 유지할 수 있다. 제안한 알고리즘에서는 평가지에 동일한 문항이 중복으로 포함되는 것을 배제하고, 이전 평가의 결과를 반영하여 적응적으로 난이도가 조절될 수 있는 새로운 형태의 유전 연산자를 설계하고 구현한다. 그리고 모의실험을 통해 기존의 임의선택 방법과 모의 담금질 방법에 비해 균일한 난이도를 갖는 평가지가 생성될 수 있음을 보인다.

• 한국지반공학회논문집
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• 제23권2호
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• pp.19-27
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• 2007

본 연구에서는 한국산업규격에서 제안하고 있는 건식방법과 습식방법을 이용하여 국내 플라스틱배수재 필터로 가장 많이 사용하는 토목섬유 3종류의 유효구멍크기를 평가하고, 시험 수행 과정에서 나타난 각 시험 방법의 특징과 시험 결과를 비교 분석하였다. 시험 결과에 의하면, 건식방법은 신속하고 간단한 시험방법이지만 상대적으로 많은 오차가 발생하는 등 좋지 않은 방법으로 나타났다. 반면에, 습식방법은 정전기 발생이나 섬유 내의 갇힘 현상 등 건식방법에서 나타나는 많은 오차를 줄일 수 있는 방법으로 판단되었다. 그러나 습식방법의 한 방법인 KS K ISO 12956의 경우, 시험에 오랜 시간이 소요되며 시험 중 사용 흙의 손실에 대한 기준이 매우 까다로운 것으로 나타났다. 일반적으로 습식방법으로 구한 토목섬유의 유효구멍크기는 건식방법으로 구한 유효구멍크기보다 작은 것으로 나타났으며, 특히 현재 사용하지 않는 방법인 수리동역학적인 방법 KS F 2126로 구한 유효구멍크기는 KS K ISO 12956방법으로 구한 유효구멍크기와 비슷하거나 작은 것으로 나타났다.

• 한국농촌건축학회논문집
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• 제24권2호
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• pp.45-52
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• 2022

Of the 17,106 domestic reservoirs(as of December 2020), 14,611 are older than 50 years, and these old reservoirs will gradually increase over time. The injection grouting method is most applied to the reinforcement method of the aging reservoir. However, the injection grouting method is not accurate in uniformity and reinforced area. An laboratory model test was conducted to evaluate the applicability of the deep mixing method, which compensated for these shortcomings, as a reservoir reinforcement method. As a result of calculating the hydraulic conductiveity for each method through the model test results, the injection grouting method was calculated as a hydraulic conductiveity value that was about 7.5 times larger than that of the deep mixing method. As a result of measuring the water level change in the laboratory model test, it was found that the water level change decreased in the injection method and deep mixing method compared to the non-reinforcement method. In addition, deep mixing method showed a water level change of about 15% based on 40 hours compared to the injection method, indicating that the water-reducing effect was superior to that of the injection method.