• Journal of Korean Society for Quality Management
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• v.43 no.3
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• pp.327-340
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• 2015

Purpose : Recently, many quality issues are aroused in military forces, such as failures in K-series weapons, combat uniforms' defects and 40mm ammunition explosion accident. To address these problems, Defense Agency for Technology and Quality(DTaQ) introduced new systems such as Manufacturing Readiness Assessment(MRA), Test Report Information System(TRIS) and so on. However, these activities require the human and time resources which cannot be increased in short period. In this paper, we suggest more practical and efficient product examination method. Methods : The most popular and widely used government's quality assurance technique is a sampling method to examine the product. In this research, we first reviewed the DTaQ's quality assurance regulation, then identified several possible problems and finally suggested more efficient and effective sampling plans. Results : We have suggested new sampling framework and evaluated its performance on two military supplies by comparing with other sampling method, and observed that the number of tested samples can be substantially reduced. Therefore, required quality assurance time can be saved. Conclusion : In this paper, we first reviewed the product examination frameworks of DTaQ, PPQMS and DCMA. Then we identified several possible problems which can cause the loss of objectivity and time. To handle these problems, we suggested the new product examination framework and tested the framework to verify the performance.

• Journal of Aerospace System Engineering
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• v.16 no.6
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• pp.18-23
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• 2022

This paper examines the electromagnetic shielding structure of ultra-high frequency (UHF) RF modules used in aircraft. Advances in electrical and electronic technologies have increased the need for electronic equipment in aircraft. High-frequency wireless devices have become integrated circuits in the form of UHF integrated circuits to support a wide range of frequencies and miniaturisation. To ensure the functionality and performance of these integrated devices in aviation, shielding is necessary to prevent unexpected electromagnetic interference, which could be detrimental to aircraft safety. A shield structure was designed to protect the RF chipset from malfunctioning, and the shielding effectiveness was improved through the application of various geometric shapes.

• Proceedings of the Korean Society of Computer Information Conference
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• 2010.07a
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• pp.349-352
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• 2010

인터넷의 등장은 세계를 초단위 정보 소통 영역으로 묶어 정보가 사회를 주도하는 형태로 발전시켰듯이, 미래 전쟁 양상도 정보가 전쟁의 승패를 결정하는 네트워크중심전(NCW)으로 발전되고 있으며, NCW의 핵심은 무기체계간 상호운용성이다. 무기체계간 상호운용성을 확보하기 위해서는 표준화된 정보를 활용해서 연동하는 중요하며, 우리 군은 무기체계간 연동을 위해 연동메시지인 KMTF를 활용하고 있다. 그러나 현 KMTF 표준은 메시지구조(message frame)만을 제시하고 세부적인 메시지는 정의하지 않아 각 체계 개발자가 나름대로 메시지를 정의함으로써 중복된 메시지를 각 체계별로 관리하고 있고, 동일한 메시지를 다른 방식으로 적용하는 부작용이 발생할 수 있으며, 체계간 연동을 위해 별도의 변환기를 개발해야 하는 문제점이 발생하고 있다. 이를 위해 본 논문에서는 첫째, 미군 메시지포맷인 USMTF를 벤치마킹하여 무기체계에 공통 적용이 가능한 공통메시지 설계방안을 제시하며, 둘째, 메시지 생명주기 관리 및 메시지 추가등록 절차 관리를 위한 KMTF 표준 관리 절차를 제시하고, 셋째, 개정된 메시지 규격에 맞는 KMTF 관리도구 개발의 방향을 제시한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.8
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• pp.187-194
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• 2020

The T&E (Test and Evaluation) results were applied for a judgment basis to decide the developmental process of system engineering for efficient weapon system R&D (Research and Development). During the OT&E (Operational Test and Evaluation) and DT&E (Development Test and Evaluation), an environmental test is essential for weapon system development owing to their highly exposed operational conditions. Based on the MIL-STD-810, MIL-HDBK-310, and AECTP 200, the ROK armed forces recommended operating temperatures for the ROK weapon system and applied this to the DT&E and OT&E. This study examined the compatibility of Korean temperature guidelines for stockpile material considering recent climate change. Moreover, this study analyzed the data from hourly measured temperatures on 101 observatories during 60 years, from 1960 to 2020, and percentage (0.5%, 1%, 5%, and 10%) and the 𝜎 (3𝜎, 2𝜎, and 1𝜎) frequency of occurrence on rigorous hot (August) and cold (January) periods, respectively. The results indicate that the highest temperature was 41℃, and the 0.5% frequency of occurrence was 37.0℃. In the case of the cold period, the lowest temperature was -32.6℃ and the 0.5% frequency of occurrence was -21.1℃. By considering the previously recommended operating temperature range for a general ground system, -30 ~ 40℃, regional operation probability is recognized 99.999%. Despite the recent abnormal climate change from global warming, the Korean temperature guidelines are compatible with the stockpile material environmental test.

• Journal of Applied Reliability
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• v.8 no.1
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• pp.39-59
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• 2008

The performance of weapon system, based on the acceleration of advanced scientific technology, has been reinforced to the state of precision, complexion and multi-function. People have given great interest for a long time on its development, acquisition cost and enormous expense of operation/support. Under this environmental situation, this research paper proposes two kinds of implementation that can improve the RAM(Reliability, Availability, Maintainability) on weapon system. The first section is to understand all of the actual states on its reliability, in the acquisition process and to make the improvement for RAM at the milestones on the acquisition steps. The next section is to establish a defense RAM center, which will be closely cooperated with acquisition organization such as Ministry of Defense, DAPA(Defense Acquisition Program Administration), DTaQ(Defense agency for Technology and Quality) and ADD(Agency for Defense Development), etc. and to conclusively improve the RAM of weapon system in South Korea.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.7
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• pp.483-489
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• 2017

The purpose of this study was to propose useful suggestions for enhancing reliability to determine the resistance against surface wetting, KS K 0590, by an imaging process. We validated the standard spray test rating chart for determining quantification standard using JAVA script-based imaging process program. All of the acquired images were processed with the image software, Image J (NIH, Nethesda, MD, USA). The study results are as follows. We established the surface area measurement-based quantitative criteria for determining resistance to surface wetting. The standard spray test rating chart was converted into a numerical standard which leads easy-to-determine ratings. We also validated the procedure for imaging treatment by analyzing quantitative data. We introduced the fluorescence image for determining ratings by enabling threshold settings and binary image conversion as an optimal imaging process. It is expected that imaging-based determination for resistant to surface wetting will serve as an accurate and reliable method for KS K 0590.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.10
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• pp.7196-7203
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• 2015

The purpose of this study is to evaluate the value of the development technology for the Digital Radio Frequency Memory(DRFM), which is a core part of the aircraft jamming equipment to retransmit the jamming signals. In this study, we evaluated the values of the development technology using DTV, which is a developed methodology for the evauation of defense technology by the Defense Agency for Technology and Quality(DTaQ). From the results, the economic value for the DRFM development technology and the multiplier of public benefit considering the peculiarities of defense technology were evaluated in 854 million won and 0.7899, respectively, and the public benefit value was calculated as 675 million won. The final value of the development technology was evaluated in 1,529 million won.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.6
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• pp.188-196
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• 2021

For the tactical vehicles operated by the Korean army, the hub-reduction portal axle was applied considering Korea's topographical characteristics. Hub-reduction was applied to a Korean military vehicle to increase the vehicle body to secure ground clearance and improve the driving capability on rough roads, such as unpaved and field land by increasing the torque. The Korean military is operating tactical vehicles after various performance tests, including durability driving, but wheel damage occurred in one of the vehicles operating in the front units. Failure analysis revealed many damaged parts, including the hub, making it difficult to determine the cause. Therefore, an analysis of the failure occurrence mechanism for each damaged part was conducted, which confirmed that the cause of wheel breakage was a hub. Furthermore, the root cause of the hub breakage was a crack due to internal pores and foreign matters. In addition, a realistic improvement plan that can be applied throughout the design, manufacture, and shipping stages was presented using the fishbone diagram analysis. The derived improvement plan was verified through unit performance tests, including CAE and actual vehicle tests, and by reflecting this, the driving safety of Korean tactical vehicles was improved. Finally, it is expected that the proposed method for analyzing the failure occurrence mechanism will be used as reference material when analyzing the quality problems of similar military vehicles in the future.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.9
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• pp.5914-5923
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• 2015

Recently, Recently, many quality problems in military supplies are raised such as K-series weapons(K-2 tank, K-9 Self-propelled artillery and K-11 Armoured Car and etc.) quality issues, leaking combat shoe issue and so on. Existing one and only national quality assurance agency for military supplies, Defense Agency for Technology and Quality(DTaQ) adapted risk management based framework to perform the government quality assurance activities. However, risk framework established by DTaQ seems lack of objectivity, consistency and efficiency. In this research, we first reviewed the DTaQ's regulations to identify the possible problems, and then suggested the alternatives which are based on advanced risk management framework and plan-do-check-action(PDCA) cycle. In conclusion, we suggested the new risk management framework, so called visual PDCA fishbone chart, and illustrated the use of the framework via real instance.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.5
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• pp.557-564
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• 2017

The purpose of the thermal imaging observation device mounted on the K's tank in the Republic of Korea military is to convert infrared rays into visual information to provide information about the environment under conditions of restricted visibility. Among the various performance indicators of thermal observation devices, such as the view, magnification, resolution, MTF, NETD, and Minimum Resolvable Temperature Difference (MRTD), the MRTD is the most important, because it can indicate both the spatial frequency and temperature resolvable. However, the standard method of measuring the MRTD in NATO contains many subjective factors. As the measurement result can vary depending on subjective factors such as the human eye, metal condition and measurement conditions, the MRTD obtained is not stable. In this study, these qualitative MRTD measurement systems are converted into quantitative indicators based on a gray scale using imaging processing. By converting the average of the gray scale differences of the black and white images into the MRTD, the mean values can be used to determine whether the performance requirements required by the defense specification are met. The (mean) value can also be used to discriminate between detection, recognition and identification and the detectable distance of the thermal equipment can be analyzed under various environmental conditions, such as altostratus, heavy rain and fog.