• 한국군사과학기술학회지
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• 제24권1호
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• pp.123-132
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• 2021

In order for the underwater vehicle to perform various tasks, it is important to control the depth, course, and roll of the underwater vehicle. To design such a controller, it is necessary to construct a dynamic model of the underwater vehicle and select the appropriate hydrodynamic coefficients. For the controller design, since the dynamic model is linearized assuming a limited operating range, the control performance in the steady state is well satisfied, but the control performance in the transient state may be unstable. In this paper, in order to overcome the problems of the existing controller design, we propose a A2C(Advantage Actor-Critic) based roll controller for underwater vehicle with stable learning performance in a continuous space among reinforcement learning methods that can be learned through rewards for actions. The performance of the proposed A2C based roll controller is verified through simulation and compared with PID and Dueling DDQN based roll controllers.

• International Journal of Computer Science & Network Security
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• 제22권11호
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• pp.184-188
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• 2022

The article considers the improved method and model of automated air situation assessment using a decision support system based on fuzzy networks of target installations. The advanced method of automated assessment of the air situation using the decision support system is based on the methodology of reflexive control of the first rank. With this approach, the process of assessing the air situation in the framework of the formulated task can be reduced to determining the purpose, probabilistic nature of actions and capabilities of the air target. The use of a homogeneous functional network for the formal presentation of air situation assessment processes will formally describe the process of determining classes of events during air situation assessment and the process of determining quantitative and qualitative characteristics of recognized air situation situations. To formalize the patterns of manifestation of the values of quantitative and symbolic information, it is proposed to use the mathematical apparatus of fuzzy sets.

• 로봇학회논문지
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• 제18권4호
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• pp.436-443
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• 2023

With the advancement of robot intelligence, the concept of man and unmanned teaming (MUM-T) has garnered considerable attention in military research. In this paper, we present a transformer-based architecture for predicting the health status of agents, with the help of multi-head attention mechanism to effectively capture the dynamic interaction between friendly and enemy forces. To this end, we first introduce a framework for generating a dataset of battlefield situations. These situations are simulated on a virtual simulator, allowing for a wide range of scenarios without any restrictions on the number of agents, their missions, or their actions. Then, we define the crucial elements for identifying the battlefield, with a specific emphasis on agents' status. The battlefield data is fed into the transformer architecture, with classification headers on top of the transformer encoding layers to categorize health status of agent. We conduct ablation tests to assess the significance of various factors in determining agents' health status in battlefield scenarios. We conduct 3-Fold corss validation and the experimental results demonstrate that our model achieves a prediction accuracy of over 98%. In addition, the performance of our model are compared with that of other models such as convolutional neural network (CNN) and multi layer perceptron (MLP), and the results establish the superiority of our model.

• Strategy21
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• 통권31호
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• pp.142-163
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• 2013

Ieodo is a submerged rock within a Korea's Exclusive Economic Zone(EEZ) in the East China Sea with its most shallow part about 4.6m below the sea level which has no specific rights for the EEZ delimitation. The United Nations Convention on the Law of the Sea (UNCLOS) stipulates that any coastal state has the rights to claim an EEZ that stretches up to 200 nautical miles from its shore, except where there is an overlap with a neighboring country's claims. Korea claims that Ieodo is within its EEZ as it sits on the Korean side of the equidistant line and the reef is located on the Korea section of the continental shelf. China does not recognize Korea's application of the equidistance principle and insists that Ieodo lies on its continental shelf. According to UNCLOS, Ieodo is located in international waters, rather than one country's EEZ as the two countries have failed to reach a final agreement over the delimitation of the maritime border. This study seeks to understand the evolution of the People's Liberation Army Navy(PLAN) strategy as main obstacles for the EEZ delimitation between Korea and China. PLAN's Strategy evolves from "coastal defense" to "offshore defence", since the late 1980s from a "coastal defence" strategy to an "offshore defence" strategy which would extend the perimeter of defence to between 200 nm and 400 nm from the coast. China's economic power has increased It's dependence on open trade routes for energy supplies and for its own imports and exports. China want secure Sea Lane. PLAN's "offshore defence" strategy combines the concept of active defence with the deployment of its military forces beyond its borders. China's navy try to forward base its units and to achieve an ocean going capability. China's navy expects to have a 'Blue Water' capability by 2050. China insists that coastal states do have a right under UNCLOS to regulate the activities of foreign military forces in their EEZs. China protests several times against US military forces operating within It's EEZ. The U.S. position is that EEZs should be consistent with customary international law of the sea, as reflected in UNCLOS. U.S. has a national interest in the preservation of freedom of navigation as recognized in customary international law of the sea and reflected in UNCLOS. U.S. insists that coastal states under UNCLOS do not have the right to regulate foreign military activities in their EEZs. To be consistent with its demand that the U.S. cease performing military operations in china's EEZ, China would not be able to undertake any military operations in the waters of South Korea's EEZ. As such, to preserve its own security interests, China prefers a status quo policy and used strategic ambiguity on the Ieodo issue. PLAN's strategy of coastal defence has been transformed into offensive defence, Korea's EEZ can be a serious limitation to PLAN's operational plan of activities. Considering China'a view of EEZs, China do not want make EEZ delimitation agreement between Korea and China. China argues that the overlapping areas between EEZs should be handled through negotiations and neither side can take unilateral actions before an agreement is reached. China would prefer Ieodo sea zone as a international waters, rather than one country's EEZ.

• 정보보호학회논문지
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• 제28권5호
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• pp.1247-1258
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• 2018

록히드 마틴사(社)에서 제안한 사이버킬체인은 사이버 공격절차를 7단계로 표준화하고, 각 단계별로 적절한 대응방안을 제시함으로써 궁극적으로 공격자가 공격목적을 달성하지 못하도록 하는 사이버작전 수행 간 방어에 대한 방법론을 제공한다. 이와 같은 사이버킬체인 모델을 활용하면 기존의 방법들로는 대응하기 어려웠던 지능형 지속공격(APT)에 보다 효과적인 대응이 가능하다는 장점이 있다. 하지만 최근의 사이버작전은 목표시스템을 직접 공격하는 기술적 사이버작전보다는 목표시스템 관리자나 사용자의 취약점을 통해 목표시스템을 우회적으로 공격하는 사회공학 사이버작전의 비중이 늘어가고 있는 추세이다. 이런 상황에서 기술적 사이버작전을 방어하기 위한 기존의 사이버킬체인 개념만으로는 사회공학 사이버작전에 효과적으로 대응할 수 없다. 따라서 본 논문에서 우리는 사회공학 사이버 작전에 효과적으로 대응할 수 있는 사회공학 사이버킬체인에 대한 개념을 정립하고자 한다.

• 융합보안논문지
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• 제10권3호
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• pp.43-49
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• 2010

정보통신 기술이 발전하여 시간과 장소에 제한 없이 통신을 할 수 있는 유비쿼터스 개념이 나타났다. 이렇게 정보를 전달할 수 있는 기술의 발전으로 현재의 사회를 정보화 사회에서 발전된 지식화 사회로 부른다. 지식화 사회는 정보를 가공하여 축척된 지식이 중심이 된 사회이다. 교육의 방법도 컴퓨터를 이용한 e-러닝(e-Learning)의 개념에서 유비쿼터스 개념이 접목된 u-러닝(u-Learning)이라는 개념으로 발전되었다. 군에서도 교육은 핵심정책 중의 하나로 꼽힌다. 전쟁의 양상이 플랫폼 중심전에서 네트워크 중심전(NCW：Network Centric Warfare)로 바뀌고 있다. 따라서 전장을 상황을 실시간으로 수집하여 관리하는 것이 지휘통제의 핵심이 된다. 이를 위해서는 첨단 지식강군 육성을 위해 개인과 조직의 능력을 최대화시켜야한다. 따라서 본 논문에서는 전장환경과 정보통신기술의 변화에 맞추어 교육훈련 및 작전에서의 u-러닝 시스템 적용 방안을 알아보고자 한다.

• Journal of Advanced Marine Engineering and Technology
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• 제36권6호
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• pp.788-793
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• 2012

본 연구는 해군함정에 탑재되어 있는 주 추진 디젤엔진에서 배출되는 입자상 물질, 황산화물, 이산화탄소 및 질소산화물의 배출량 예측에 초점을 두었다. 국제사회 및 각국의 정부는 인간의 건강 및 환경을 보호하기 위해 선박의 배기가스 규제를 엄격히 적용하고 있으며 선박 제작사들은 이러한 법규에 대응하기 위해 다양한 기술을 선박에 적용시키고 있다. 엄격히 적용되는 배기가스 법규는 선박의 크기에 따라 차이를 보이고 있지만 함정은 규제대상에서 제외된다. 다양한 연구결과에 의해 선박의 배기가스 배출량 계수(emission factor)는 지속적으로 최신화되고 있으나 함정의 배출량 계수는 그 특성의 차이 때문에 설정이 어려운 실정이다. 본 논문은 함정 엔진의 연료소모량과 함정에서 사용하고 있는 연료의 황성분 함량을 분석하여 항해 시 선박에 적용되고 있는 오염물질 기여도 조사(emission inventory) 방법론을 해군함정에 적용시켜 정속항해 조건에서 배기가스 총 배출량을 예측하는 것이다.

• International Journal of Computer Science & Network Security
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• 제23권12호
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• pp.167-174
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• 2023

Electronic educational environments in the conditions of quarantine restrictions of COVID-19 have become a common phenomenon for the organization of distance educational activities. Under the conditions of Russian aggression, Ukrainian proof of their use is unique. The purpose of the article is to analyze the role of electronic educational environments in the process of training applicants for higher education in Ukraine in the realities of a large-scale war. General scientific methods (analysis, synthesis, deduction, and induction) and special pedagogical prognostic methods, modeling, and SWOT analysis methods were used. In the results, the general properties of the Internet educational platforms common in Ukraine, the peculiarities of using the Moodle and Prometheus platforms, and an approximate model of the electronic learning environment were discussed. The reasons for the popularity of Moodle among Ukrainian universities are analyzed, but vulnerable elements related to security are emphasized. It was also determined that the high cost of Prometheus software and less functionality made this learning environment less relevant. The conclusions state that the military actions drew the attention of universities in Ukraine to the formation of their own educational platforms. This is especially relevant for technical and military institutions of higher education.

• Strategy21
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• 통권37호
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• pp.32-64
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• 2015

This paper examines the types and trends of North Korea's military provocations and regional maritime threats against South Korea, and is focusing on the Republic of Korea's naval development and modernizations by the Republic of Korea Navy (ROKN) on future actions, what directions of the ROKN has taken thus far in response, as well as an examination of how the ROKN might respond to vulnerabilities identified throughout modern history. Importantly, this paper does not consider the domestic, bilateral, multilateral, regional and global political dimensions of the situation on the Korean Peninsula; nor does it consider the North Korea's transitional power politics, but including North Korea's nuclear program and submarine-launched ballistic missile developments, as a caveat, this paper is based on open sources in Korean and English language, and thus information concerning provocations is indicative only.

• 한국신뢰성학회지:신뢰성응용연구
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• 제13권3호
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• pp.217-227
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• 2013

Reliability growth is defined as the positive improvement in a reliability parameter over a period of time due to implementation of corrective actions to system design, operation or maintenance procedures, or the associated manufacturing process. In recent, the importance of reliability growth management has emerged in the military authority and industries. For effective application of reliability growth models, it is necessary to understand their characteristics and differences. This paper presents the concepts of reliability growth management and compares the features of reliability tracking and projection models centered on MIL-HDBK-189C for selecting the appropriate model for an one-shot system under development.