• International Journal of Computer Science & Network Security
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• 제22권12호
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• pp.29-36
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• 2022

Smart grid (SG) software platforms and communication networks that run and manage the entire grid are increasingly concerned about cyber security. Characteristics of the smart grid networks, including heterogeneity, time restrictions, bandwidth, scalability, and other factors make it difficult to secure. The age-old strategy of "building bigger walls" is no longer sufficient given the rise in the quantity and size of cyberattacks as well as the sophisticated methods threat actor uses to hide their actions. Cyber security experts utilize technologies and procedures to defend IT systems and data from intruders. The primary objective of every organization's cybersecurity team is to safeguard data and information technology (IT) infrastructure. Consequently, further research is required to create guidelines and methods that are compatible with smart grid security. In this study, we have discussed objectives of of smart grid security, challenges of smart grid security, defensive cybersecurity techniques, offensive cybersecurity techniques and open research challenges of cybersecurity.

• 융합보안논문지
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• 제23권4호
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• pp.71-80
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• 2023

사이버공간은 지상, 해상, 공중, 우주에 이어 다섯 번째 새로운 전쟁 공간으로 자리매김하였고, 군사작전 측면에서도 사이버공간이 핵심적인 공격과 방어 목표가 되고 있다. 세계 각국은 이러한 사이버공간에 대한 공세적 사이버 작전 수행의지를 보인다. 본 논문에서는 기존의 방어적 전략인 사이버 킬체인 모델에 합동 항공임무명령서(ATO)의 임무수행주기와 합동표적처리 절차를 융합한 공세적 개념의 사이버 킬체인 모델을 제안한다. 제안한 모델은 사이버 작전의 합동성 측면에서 물리 작전과 사이버 작전의 통합을 통해 전략적 차원의 국가 사이버 작전 역량 개선에 기여할 것으로 기대한다.

• ETRI Journal
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• 제41권5호
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• pp.585-598
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• 2019

A cyber-physical system (CPS) is a new mechanism controlled or monitored by computer algorithms that intertwine physical and software components. Advanced persistent threats (APTs) represent stealthy, powerful, and well-funded attacks against CPSs; they integrate physical processes and have recently become an active research area. Existing offensive and defensive processes for APTs in CPSs are usually modeled by incomplete information game theory. However, honeypots, which are effective security vulnerability defense mechanisms, have not been widely adopted or modeled for defense against APT attacks in CPSs. In this study, a honeypot game-theoretical model considering both low- and high-interaction modes is used to investigate the offensive and defensive interactions, so that defensive strategies against APTs can be optimized. In this model, human analysis and honeypot allocation costs are introduced as limited resources. We prove the existence of Bayesian Nash equilibrium strategies and obtain the optimal defensive strategy under limited resources. Finally, numerical simulations demonstrate that the proposed method is effective in obtaining the optimal defensive effect.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권10호
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• pp.5260-5275
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• 2019

In the process of constructing the traditional offensive and defensive game theory model, these are some shortages for considering the dynamic change of security risk problem. By analysing the critical indicators of the incomplete information game theory model, incomplete information attack and defense game theory model and the mathematical engineering method for solving Bayes-Nash equilibrium, the risk-averse income function for information assets is summarized as the problem of maximising the return of the equilibrium point. To obtain the functional relationship between the optimal strategy combination of the offense and defense and the information asset security probability and risk probability. At the same time, the offensive and defensive examples are used to visually analyse and demonstrate the incomplete information game and the Harsanyi conversion method. First, the incomplete information game and the Harsanyi conversion problem is discussed through the attack and defense examples and using the game tree. Then the strategy expression of incomplete information static game and the engineering mathematics method of Bayes-Nash equilibrium are given. After that, it focuses on the offensive and defensive game problem of unsafe information network based on risk aversion. The problem of attack and defense is obtained by the issue of maximizing utility, and then the Bayes-Nash equilibrium of offense and defense game is carried out around the security risk of assets. Finally, the application model in network security penetration and defense is analyzed by designing a simulation example of attack and defense penetration. The analysis results show that the constructed income function model is feasible and practical.

• Strategy21
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• 통권44호
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• pp.142-176
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• 2018

So far, the main threat to South Korea was North Korea. That is why South Korea established a strategy based on the threat of North Korea and most of the budget on defense was used to deter North Korea. Even though the neighboring countries(China, Japan, and Russia) are growing as a real threat with abilities and intentions based on their powerful naval forces, South Korea has not yet been able to establish a strategy that regards neighboring countries as a threat. But the decades-old structural mechanism of the Korean security environment is undergoing a radical change on April 27, 2018, through the South-North summit and the Panmunjom Declaration. Under the changing security environment, South Korea was placed in a complicated dilemma that had to deal with threats of two axes(China), three axes(China, Japan), and four axes(Japan, Russia). If the one axis threat(North Korea) is dominated by land threats, the second, third and fourth axis threats are threats from the sea. This paper analyzed the maritime strategy of Korea within the framework of maritime-geopolitics, in other words recognition and expansion of the sphere of maritime. I have designed that the maritime defense space that we can deny from threats is divided into three lines of defense: 1 line (radius 3,000km), 2 lines (2,000km), and 3 lines (1,000km). The three defense zones of the three lines were defined as an active defense(1 line), defensive offense(2 line), active offense(3 line). The three defense zones of the three lines were defined as the sphere of core maritime, As a power to deny the sphere of core maritime, it was analyzed as a maneuvering unit, a nuclear-powered submarine, the establishment of missile strategy, and the fortification of islands station. The marine strategy of South Korea with these concepts and means was defined as 'Offensive Maritime Denial Strategy'.

• 해양안보
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• 제2권1호
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• pp.1-42
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• 2021

해양강국 달성을 위한 중국 해군전략의 성격에 대한 공세성 논란이 이어지고 있다. 본 연구는 이러한 논란 속에서 전략의 3요소를 이용, 해양강국 달성을 위한 중국 해군전략의 실체적 성격을 파악하고 이를 통해 차후 중국의 군사적 행동을 전망하는 것을 목적으로 한다. 연구목적을 달성하기 위하여 본 연구는 전략의 3요소와 함께 해군전략의 특수성을 고려하여 연구를 진행하였으며 연구결과 중국의 해군전략은 전체적으로 공세성을 띄고 있으나 각 전략요소 간의 공세성을 추구하는 정도에서는 불균형을 이루고 있었다. 방법적 측면에서는 공세성이 두드러지게 나타났으나, 목표·수단적 측면에서는 해양강국 달성을 위한 주변국과의 협력 필요성과 군사기술·작전지속 능력 부족이라는 제한사항이 존재하였다. 이러한 전략요소 간의 불균형을 통해 도출한 중국의 차후 군사적 행동의 전망은 다음과 같다. ① 당분간 미국과의 전면적 군사충돌의 위험은 낮다. ② 1도련선 내에서는 주변국에게 해군력을 강압의 수단으로 활용하거나 또는 제한적인 군사충돌을 일으킬 수 있다. ③ 영유권 분쟁을 둘러싼 해군력 대치시 미국 및 주변국과 우발적인 군사충돌이 발생할 수 있다.

• 제어로봇시스템학회논문지
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• 제9권11호
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• pp.906-916
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• 2003

A multi-robot control algorithm using Petri-Net is proposed for 5vs5 robot soccer. The dynamic environment of robot soccer is modeled by defining the place and transition of each robot and converting it into Petri-Net diagram. Once all the places and transitions of robots are represented by the Petri-Net model, their actions can be chosen according to the roles of robots and position of the ball in soccer game, e.g., offensive, defensive and goalie robot. The proposed modeling method is implemented for soccer robot system. The efficiency and applicability of the proposed multiple-robot control algorithm using Petri-Net are demonstrated through 5vs5 Middle League SimuroSot soccer game.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2019년도 춘계학술대회
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• pp.436-438
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• 2019

에어하키 로봇은 머신 비전 시스템으로 하키 공을 카메라를 통해 인식하여 사용자와 플레이를 할 수 있다. 하키 공의 위치 감지는 OpenCV 라이브러리를 사용하여 공의 색 정보를 이용하여 인식하게 구현하였다. 하키 공의 위치를 감지하고 또한 그 궤적을 예측하여 결과를 ARM Cortex-M 보드로 전송한다. ARM Cortex-M보드는 2축 직교 로봇을 제어하여 에어 하키 경기를 진행한다. 에어 하키 로봇의 전략에 따라 수비, 공격, 수비과 공격 모드로 동작시킬 수 있다. 본 논문에서는 비전 시스템 개발과 궤적 예측 시스템에 관해 기술하고 에어 하키 경기를 진행하는 2축 직교 로봇을 제어하는 새로운 방법을 제시한다.

• 해양안보
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• 제1권1호
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• pp.61-92
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• 2020

본 논문은 중국의 시기별 해군전략의 전략운용 목표, 범위, 방식을 살펴보고, 시진핑 시기 해군전략의 목표와 특징, 전략적 함의를 분석해 보는 데 그 목적이 있다. 신(新)중국 성립 이후 해군은 현재까지 총 네 번에 걸쳐 전략변화를 구사하였다. 현재 시진핑 시기 중국의 해군전략은 근해적극방어전략이 결합된 원해호위전략이다. 현재 중국의 해군전략은 공격성 무기체계로 인해 공격적 전략으로 전환되고 있고, 최신식 함정의 비중이 높아지고 있으며, 운용범위는 연안과 근해를 벗어나 전 세계 해양이 대상이 되었다. 중국의 해군전략이 전환됨에 따라 중국 해군은 해양주도권 확보를 전략적 목표로 설정하고 외부 세력의 개입과 침입에 적극 대응하기 위한 공세적 전략을 실행할 것이다. 이에 중국 해군은 원거리 지역 해상 분쟁지역에서 분쟁당사국들을 더욱 압박하기 위해 억제전력과 기동전력을 향상시킬 것이다. 또한 중국의 해군전략은 '차단'에서 '신속대응'이라는 운용 방식으로 점차 전환될 것으로 전망한다.

• Strategy21
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• 통권44호
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• pp.177-212
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• 2018

The purpose of this article is to examine the 'Discussion of maritime defense' which began to be discussed from the late Goryeo dynasty to the early Joseon dynasty and the process of establishing a maritime defense system. Also it can identify changes in the aspects of the naval ship operation and their strategic tactics during the reign of King Sejong. Japanese raiders began a full-scale invasion from 1350 at the late Goryeo Dynasty, So the government realized the need to raise the 'Sea power' and to organize the maritime defense system for defending enemy invasion. for example, the reinforcement of naval forces, construction of warships, develoment of weapon systems and so on. which have achieved remarkable growth while continuing, have also been used to carry out a three-time 'Conquest of Daemado' in 1389, 1396, 1419. Until then, however, it is difficult to interpret that the naval forces had a systematic and organizational combat operation system. According to fighting patterns on combat reports before the early days of King Sejong's reign, Our naval forces had no advantage over the Japanese raiders in terms of their capabilities and tactics. Then, the period of King Sejong marked a watershed in maritime defense history. Based on accumulated experience of naval battles and force Projections, The paradigm shift of the naval strategic tactics for maritime defense has occurred. First, the capability of the naval vessels has improved. for example, ship speed, durability, and weather resistance. Through these efforts, navy forces were able to pursue and attack, destroy enemy's ships by taking advantage of the 'Ship speed superiority'. This has led to tactical shifts from defensive to offensive. Second, purpose to support offensive tactics, the government put a strategic plan into practice that is the forward depolyment of naval bases from the inland to the coast, considering the 'sea environment' and 'threat'. By doing so, Joseon dynasty was able to secure 'the command of the sea'. This may be a little different from the perception of the so-called 'peace period' that King Sejong's era. We need to remember that Joseon dynasty was working hard for its defense. When studying history of maritime defense, these strategic and tactical elements must be fully considered. Only then we can have a coherent understanding of the many naval battles in the past, including the Imjin War(1592-1598).