• Title/Summary/Keyword: Weapon

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An Experimental Study on the Measurement of Water Surface Discharge Temperature of High-Temperature Bubble Injected into Cylindrical Acrylic Water Tank (원통 아크릴 수조로 주입된 고온 기포의 수면 배출 온도 측정에 관한 실험적 연구)

  • SeokTae Yoon;YongJin Cho
    • Journal of Korea Society of Industrial Information Systems
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    • v.28 no.6
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    • pp.99-105
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    • 2023
  • Submarines, which require a high degree of survivability, are among the most critical combat weapon systems in military strategic assets. Conventional submarines need air to operate their propulsion systems. Exhaust gases released into the water during snorkel navigation heat the surrounding fluid, producing a temperature wake. This wake, in turn, reduces the submarine's survivability. In this study, we conducted a preliminary experiment on the temperature traces formed by an underwater submarine's waste discharge. For this purpose, we collected propulsion system and navigation condition data from domestically introduced submarines and developed an experimental system to measure the temperature traces. As a result, we observed that high-temperature bubbles injected into the tank broke down into smaller sizes, and their temperature dropped to levels similar to the surrounding fluid. This observation was confirmed using a thermocouple sensor. Consequently, the thermal imaging system designed to measure the temperature trace of the water's surface did not detect any significant temperature traces.

Research on RAM-C-based Cost Estimation Methods for the Supply of Military Depot Maintenance PBL Project (군직 창정비 수리부속 보급 PBL 사업을 위한 RAM-C 기반 비용 예측 방안 연구)

  • Junho Park;Chie Hoon Song
    • Journal of the Korean Society of Industry Convergence
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    • v.26 no.5
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    • pp.855-866
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    • 2023
  • With the rapid advancement and sophistication of defense weapon systems, the government, military, and the defense industry have conducted various innovative attempts to improve the efficiency of post-logistics support(PLS). The Ministry of Defense has mandated RAM-C(Reliability, Availability, and Maintainability-Cost) analysis as a requirement according to revised Total Life Cycle System Management Code of Practice in May 2022. Especially, for the project budget forecast of new PBL(Performance Based Logistics) business contacts, RAM-C is recognized as an obligatory factor. However, relevant entities have not officially provided guidelines or manuals for RAM-C analysis, and each defense contractor conducts RAM-C analysis with different standards and methods to win PBL-related business contract. Hence, this study aims to contribute to the generalization of the analysis procedure by presenting a cost analysis case based on RAM-C for the supply of military depot maintenance PBL project. This study presents formulas and procedures to determine requirements of military depot maintenance PBL project for repair parts supply. Moreover, a sensitivity analysis was conducted to find the optimal cost/utilization ratio. During the process, a correlation was found between supply delay and total cost of ownership as well as between cost variability and utilization rate. The analysis results are expected to provide an important basis for the conceptualization of the cost analysis for the supply of military depot maintenance PBL project and are capable of proposing the optimal utilization rate in relation to cost.

Evaluation of Applicability of Circuit-analog Radar Absorbing Structures for High Temperature in 350℃ and Hot-wet Environment (고온용 Circuit-analog 전파흡수구조의 350℃ 및 열 수분 환경에서의 적용성 평가)

  • Min-Su Jang;Ho-Beom Kim;Heon-Suk Hong
    • Composites Research
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    • v.36 no.5
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    • pp.335-341
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    • 2023
  • We proposed a high-temperature circuit-analog radar absorbing structures (CA-RAS), and evaluated radar absorption performance and tensile properties in 350℃ and a hot-wet environment. The CA-RAS was implemented with a glass/cyanate ester composites and a square resistive pattern layer, and reflection loss was measured by 350℃ and after exposure of hot-wet condition using free space measurement. And the tensile strength at 350℃ and after exposure of hot-wet condition was measured according to the ASTM D638. The proposed CA-RAS showed a 4 GHz of -dB bandwidth and -20 dB of a peak value at 350℃. In addition, there was no deterioration in absorption performance after exposure to a hot-wet condition. The tensile strength value of more than 95% compared to the strength of the glass/cyanate ester composite was confirmed at 350℃ and after exposure of hot-wet condition. Through this, the applicability of CA-RAS proposed in this study was confirmed as a load bearing structure for stealth weapon exposed to high temperature and hot-wet environment.

The Development of Artificial Intelligence-Enabled Combat Swarm Drones in the Future Intelligent Battlefield (지능화 전장에서 인공지능 기반 공격용 군집드론 운용 방안)

  • Hee Chae;Kyung Suk Lee;Jung-Ho Eom
    • Convergence Security Journal
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    • v.23 no.3
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    • pp.65-71
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    • 2023
  • The importance of combat drones has been highlighted through the recent outbreak of the Russia-Ukraine war. The combat drones play a significant role as a a game changer that alters the conventional wisdom of traditional warfare. Many pundits expect the role of combat swarm drones would be more crucial in the future warfare. In this regard, this paper aims to analyze the development of artificial intelligence-enabled combat swarm drones. To transform the human-operated swarm drones into fully autonomous weaponry system our suggestions are as follows. Developments of (1) AI algorithms for optimized swarm drone operations, (2) decentralized command and control system, (3) inter-drones' mission analysis and allocation technology, (4) enhanced drone communication security and (5) set up of ethical guideline for the autonomous system. Specifically, we suggest the development of AI algorithms for drone collision avoidance and moving target attacks. Also, in order to adjust rapidly changing military environment, decentralized command and control system and mission analysis allocation technology are necessary. Lastly, cutting-edging secure communication technology and concrete ethical guidelines are essential for future AI-enabled combat swarm drones.

Exploring Near-Future Potential Extreme Events(X-Events) in the Field of Science and Technology -With a Focus on Government Emergency Planning Officers FGI Results -

  • Sang-Keun Cho;Jong-Hoon Kim;Ki-Woon Kim;In-Chan Kim;Myung-Sook Hong;Jun-Chul Song;Sang-Hyuk Park
    • International Journal of Advanced Culture Technology
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    • v.11 no.4
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    • pp.310-316
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    • 2023
  • This study aims to predict uncertain future scenarios that may unfold in South Korea in the near future, utilizing the theory of extreme events(X-events). A group of 32 experts, consisting of government emergency planning officers, was selected as the focus group to achieve this objective. Using the Focus Group Interview (FGI) technique, opinions were gathered from this focus group regarding potential X-events that may occur within the advanced science and technology domains over the next 10 years. The analysis of these opinions revealed that government emergency planning officers regarded the "Obsolescence of current technology and systems," particularly in the context of cyber network paralysis as the most plausible X-event within science and technology. They also put forth challenging and intricate opinions, including the emergence of new weapon systems and ethical concerns associated with artificial intelligence (AI). Given that X-events are more likely to emerge in unanticipated areas rather than those that are widely predicted, the results obtained from this study carry significant importance. However, it's important to note that this study is grounded in a limited group of experts, highlighting the necessity for subsequent research involving a more extensive group of experts. This research seeks to stimulate studies on extreme events at a national level and contribute to the preparation for future X-event predictions and strategies for addressing them.

A Study on the Software Simulation Test of the Joint Tactical Data Link System Using the Linux Container Environment (LXC 환경을 이용한 한국형 합동 전술데이터링크체계의 소프트웨어 모의시험에 관한 연구)

  • Hyeong-Seok Ham;Young-Hoon Goo;Dae-Young Song
    • The Journal of the Korea institute of electronic communication sciences
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    • v.18 no.6
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    • pp.1125-1132
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    • 2023
  • The importance of networks is gradually expanding in the battlefield environment. As time goes by, the types of tactical data links used in the Korean JTDLS are increasing, and the military's weapon systems equipped with tactical data link systems are increasing. Thorough quality verification is required to provide stable software to the wider battlefield. This study examines how to prepare an environment in which various simulation tests to verify the stability of the Korean JTDLS project can be conducted as diverse as possible using minimal physical space and Hardware resources. Through this, it is possible to improve the completeness of the project and secure the stability of the program, and it is intended to contribute to securing higher stability and reliability by securing maximum test capabilities in a limited test environment even in Linux based system project of a similar environment.

Number of Phase Screens Required for Simulation of a High-energy Laser Beam's Propagation Experiencing Atmospheric Turbulence and Thermal Blooming (대기 난류와 열적 블루밍을 겪는 고출력 레이저 빔의 대기 전파 시뮬레이션에 필요한 위상판 개수 분석)

  • Seokyoung Yoon;Woohyeon Moon;Hoon Kim
    • Korean Journal of Optics and Photonics
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    • v.35 no.2
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    • pp.49-60
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    • 2024
  • We analyze the number of phase screens required for the simulation of a high-energy laser beam's propagation over an atmospheric channel. For high-energy lasers exceeding tens of kilowatts (kW) in power, the laser beam is mainly affected by atmospheric turbulence and thermal blooming. When using the split-step method to implement losses due to atmospheric absorption and scattering and distortion of the beam due to turbulence and thermal blooming, the number of phase screens is a critical factor in determining the accuracy and time required for the simulation. By comparing simulation results obtained using a large number of phase screens (e.g., 150 screens) under a wide range of atmospheric turbulence conditions, we provide new guidelines for the number of phase screens required for simulating the beam propagation of a high-power laser below 2.5×106 W/m2 (e.g., a 500-kW laser beam having a 50-cm diameter).

A Research on the Nuclear Deterrence Strategy of South Korea through Dispute of India and Pakistan

  • Dong-Kwon Cho;Young-Hwan Ryu;Sin-Young Yu
    • Journal of Radiation Industry
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    • v.17 no.4
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    • pp.411-416
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    • 2023
  • From Cold War, Nuclear weapons have emerged military power into a very dangerous and important way of each national security. Throughout the era, the U.S. had stationed nuclear weapons in South Korea. But President George Bush initially started the withdrawal of nuclear tactical weapons deployed abroad in 1991. After that, under the protection of the nuclear umbrella, South Korea guarantees that the United States would operate its nuclear weapons to protect South Korea if it would be needed and the economy of South Korea has rapidly developed as more strong countries in the world. However, South Korea has seen and been realized the present state from the recent war between Russia and Ukraine. The protection of the U.S. nuclear umbrella from nuclear weapons and ballistic missiles of North Korea is unlikely to be permanently guaranteed. At the same time, South Korea should consider the security environment changes of surrounding nations such as China as military power acceleration and Russia as re-formation ambition. Because of these reasons, South Korea independently wants to protect itself and have the own nuclear weapons as a way to counter security threats. A majority of South Koreans also definitely believe that North Korea will not denuclearize or give up because North Korea has been having nuclear weapons as the final survival strategy of Kim Jong Un's regime. However, South Korea considers and makes new nuclear strategy through the role and effect of nuclear deterrence strategy in dispute between India and Pakistan and how to overcome the paradox of nuclear deterrence strategy. Therefore, this research is to suggest the effective nuclear deterrence strategy of South Korea from new security threats of surrounding nations through dispute between India and Pakistan. The focus of this research is that what is the role and paradox of nuclear deterrence strategy in dispute between India and Pakistan and how to find the effective nuclear deterrence strategy of South Korea.

Analysis of the Economic Impact of Plan to Introduce Korea Nuclear Powered Submarines (한국형 원자력 잠수함 도입 방안별 경제적 파급효과 분석)

  • Jongwon Kang;Chanhyeon Park
    • Journal of The Korean Institute of Defense Technology
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    • v.5 no.4
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    • pp.1-8
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    • 2023
  • In this study the economic impact of each plan for introducing Korea unclear-powered submarines were analyzed. This study conducted a preliminary investigation into foreign countries cases of unclear-powered submarines and classified three introduction plans. In order to analyze the economic impact of each introduction plan, a multiple-level survey was conducted targeting experts with experience in developing and operating ship weapon systems, and quantitative results were calculated for subcategory items with industrial relevance for industrial correlation analysis. The value added inducement coefficient and production inducement coefficient and employment inducement coefficient were calculated for each introduction method, and a favorable introduction method was derived. It is hoped that the results of this study will serve as a reference for policy decision-making during prior research for the introduction of korea nuclear submarines.

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A Method of Determination of the Number of Tests for Reliability Growth Management (신뢰성 성장관리 시험의 시험 시료 수 결정 방안)

  • Yangwoo Seo;Daeung Choi;Chunsup Um;Yonggeun Kim;Jungtae Kim
    • Journal of The Korean Institute of Defense Technology
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    • v.5 no.1
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    • pp.1-6
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    • 2023
  • The number of test samples was calculated by setting the reliability growth management test period considering the weapon system development period. The optimal reliability growth management test design condition was 80% reliability, 60% confidence level, and 6 months of test period. At this time, it was analyzed that 4 test samples were required if 0 failure occurred, and 9 test samples were required if 1 failure occurred. Using the method of determining the number of samples presented in this paper, it can be used as a basis for acquiring a budget for the number of samples for reliability growth management when switching from the exploratory development stage to the system development stage.

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