• Proceedings of the Korean Radioactive Waste Society Conference
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• 2018.05a
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• pp.347-348
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• 2018

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.5
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• pp.1102-1112
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• 2012

The policy of the United States is a Korean Peninsula free of all nuclear weapons. The United States government was considering the possibility of military action to eliminate the North Korean nuclear threat. Talk of military action peaked from mid-1993 through mid-1994. Such an attack might have led directly to a Korean war. At that time the nuclear crisis solutioned by North Korea-United States negotiation and ROK-United States alliance. PSI's purpose is to prevent or at least inhibit the spread of weapons of mass destruction, their delivery systems, and related materials to and from states and non-state actors whose possession would be a serious threat to global or regional security. The most controversial activity of PSI is interdiction. North Korea has expressed grave concern over the initiative, stating that it has a sovereign right to develop, deploy, and export weapons, and that it would view any interdiction of its ships as a declaration of war. If South Korea is to execute interdiction North Korean ships expect tensions to increase dramatically on the peninsula with North Korea doing something quite provacative in response. South Korea cannot help approaching PSI with great caution, since it has to consider the ROK-United States alliance, and inter-Korean relations.

• Nuclear Engineering and Technology
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• v.50 no.7
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• pp.1106-1111
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• 2018

Electromagnetic waves potentially have been used to heat overdense nuclear fusion plasmas through a double mode conversion from ordinary to slow extraordinary and finally to Electron Bernstein Wave (EBW) modes, OSXB. This scheme is efficient and has not any plasma density limit of electron cyclotron resonance heating due to cut-off layer. The efficiency of conversion depends on the isotropic launching angles of the microwaves with the plasma parameters. In this article, a two-step mode conversions of OSXB power transmission efficiency affected by the fast extraordinary (FX) loses at upper hybrid frequency are studied. In addition, the kinetic (hot) dispersion relation of a overdense plasma in a full wave analysis of a OSXB in Wendelstein 7X (W7-X) stellarator plasma has been numerically simulated. The influence of plasma dependent parameters such as finite Larmor radius, electron thermal velocity and electron cyclotron frequency are represented.

• Journal of Aerospace System Engineering
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• v.10 no.1
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• pp.118-126
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• 2016

North Korea has continued developing ballistic missiles with various ranges. Even through the recent launch long-range missiles, it can be inferred that North Korea's Missile technology has reached a level where it can even threaten the US. moreover, through the three times nuclear tests, North Korea is known to have succeeded at gaining 10~20KT of explosive power as well as the minimization and lightening of nuclear warhead. Considering the short length of war zone in Korean peninsula and the possibility of nuclear equipment, if be the most severe threat across the whole peninsula. Since the midcourse phase flight takes the longest time, ROK should establish the ability to intercept at this middle phase. From this perspective, this paper describes mission effect of a sea-based BMD system through empirical threat and flight characteristic analysis using MIT model that was not suggested in original research.

• The Journal of the Convergence on Culture Technology
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• v.6 no.4
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• pp.209-217
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• 2020

North Korea has steadily implemented defense reforms to strengthen its national defense capabilities, and in particular, has made military technology development and military industrial capability strengthening as the focus of national defense reform. North Korea's defense reform ultimately aimed at securing nuclear posture, and as technical achievements accumulated in the Kim Jung-Un era, it led to the development of military strength such as hydrogen bombs and ICBM/SLBM. Having secured nuclear capability, North Korea is also pursuing a symmetricality in the conventional military strength by securing a strategic advantage by pursuing the modernization of the conventional weapon systems through defense reform again. Up to now, North Korea's defense reform has succeeded in establishing a new ruling system for Kim Jung-Un and creating a driving force for negotiations with the United States.

• The Journal of the Convergence on Culture Technology
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• v.10 no.3
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• pp.299-304
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• 2024

Beyond the first nuclear age, which pitted the United States and the Soviet Union against each other, we are now in the second nuclear age, in which the decision-makers of nuclear weapons are diversified among countries large and small. India and Pakistan, two such countries, are antagonistic toward each other and possess nuclear weapons, but their nuclear posture and nuclear strategies are different. The examples of these two countries can provide clues to the future nuclear posture of North Korea, which faces South Korea. In particular, Pakistan's chosen posture of pre-emptive deterrence is a highly offensive nuclear posture that threatens to use nuclear weapons against an adversary to deter aggression. This is an option that can be accomplished even with a small nuclear arsenal that can be used as a first strike, so it seems to be the optimal posture for a nuclear-powered Pakistan to choose in response to an Indian threat. North Korea, which is outgunned by the United States and South Korea, is likely to continue to threaten to use nuclear weapons preemptively like Pakistan. However, it is expected to be defensive and quite conservative, like India, until it actually uses them to maintain its regime.

• Convergence Security Journal
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• v.17 no.3
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• pp.83-93
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• 2017

The U.S.-China Relations could be analyzed two perspectives and their basis under major international p olitics theory-power transition with conditions: (1) North Korean's nuclear puzzle, (2) THAAD in the Kor ean Peninsula and (3) the U.S.-ROK Alliance. One perspective is the global order dominates the regional order, and then stable regional order comes out. The other is the regional order dominates the global ord er, and China wages a regional hegemonic conflict against the United States. Consequently, America's o verwhelming leadership in North Korean's nuclear, THAAD and U.S.-ROK Alliance as national power is expected to endure. But China also has expected empowerment and cooperation for the peace and stabilit y on the Korean Peninsula military problems. In this perspective, South Korea needs to pay attention to the changing power distribution and competition between the U.S. and China and needs to strengthen a balancing and harmonious diplomatic strategy, so called 'see-saw diplomacy'.

• Strategy21
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• s.40
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• pp.190-215
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• 2016

As North Korea's asymmetric threats are growing, there have been numerous discussions to find out effective counter-measures and many official plans and procurements efforts have been established. However, discussions on ROK Navy's roles in countering North Korea's asymmetric threats have been taken place very limitedly. Decision makers and military planners put enormous efforts in getting counter-measures, however, most of the options on the table are systems of Army and Air Force. This is true if one looks at components of Kill-Chain, KAMD, and KMPR. With worsening security environment of the Korean peninsula, it has been said by many commentators that ROK Navy needs to consider expanding its roles in countering against North Korea's asymmetric military threats. They asked ROK Navy to go beyond the mind-set that has confined Navy's roles in deterring North Korean naval threats. That is, ROK Navy should fight 'from the sea' as well as fight 'on the sea.' If ROK Navy begins to think about fight 'from the sea,' there would be many possibilities for the Navy to be a part of countering North Korea's asymmetric military threats. In order to pursue proactive roles in countering North Korea's asymmetric threat, ROK Navy needs to consider various options. Massive missile forces, nuclear-propelled submarines, naval special forces may be some of them. With those measures, ROK Navy would launch massive and decisive attacks from the sea without risking survivability of our forces. Considering North Korean Navy's weakness, it is very probable that sea would be safer place than ground or sky. Expanding ROK Navy's roles and being a proactive deterrent forces against North Korean asymmetric threats would provide very reliable counter-measures to South Korean military. Thus, military planners should think how to take the best advantage of expanded ROK Navy's roles and capabilities against North Korean asymmetric threats.

• Strategy21
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• s.40
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• pp.82-114
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• 2016

The purpose of this article is to analyze the progress of North Korea's SLBM threat, and to assess the technological capacity and threat level of its SLBMs. Currently, North Korea has approximately 1000 ballistic missiles, such as the SCUD, Musudan, and Nodong, in stock. This article pays close attention to the background and strategical implication behind North Korea's obsession with developing SLBMs despite possessing sufficient means to launch provocations with its current arsenal of ground based ballistic missiles and conventional weapons. Based on the abovementioned analysis, this article will recommend possible response directions for the ROK Armed Forces to North Korea's SLBM threat. It is highly difficult to detect SLBMs due to its stealthy nature, as it is launched underwater after covert infiltration. North Korea's SLBM is considered a game changer in that even one SLBM can significantly change the strategic balance of North East Asia. North Korea's SLBM test launch in August has made a 500km flight, landing 80km inside the JADIZ (Japan Air Defense Identification Zone), and as such, it is assessed that North Korea already possesses underwater ejection and cold launch capabilities. The most realistic response to North Korea's imminent SLBM threat is bolstering anti-submarine capabilities. ROK Armed Forces need to upgrade its underwater kill-chain by modernizing and introducing new airborne anti-submarine assets and nuclear-powered submarines, among many options. Moreover, we should integrate SM-3 missiles with the Aegis Combat system that possess strong detection capabilities and flexibility, thereby establishing a sea-based Ballistic Missle Defense (BMD) system centered around the Aegis Combat System, as sea-based ballistic missile threats are best countered out in the seas. Finally, the capabilities gap that could arise as a result of budgetary concerns and timing of fielding new assets should be filled by establishing firm ROK-US-Japan combined defense posture.

• Nuclear Engineering and Technology
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• v.52 no.6
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• pp.1137-1147
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• 2020

The discrete ordinates method (S_N) is one of the major shielding calculation method, which is suitable for solving deep-penetration transport problems. Our objective is to explore the available quadrature sets and to improve the accuracy in shielding problems involving strong anisotropy. The linear discontinuous finite-element (LDFE) quadrature sets based on the icosahedron (in short, ICLDFE quadrature sets) are developed by defining projected points on the surfaces of the icosahedron. Weights are then introduced in the integration of the discontinuous finite-element basis functions in the relevant angular regions. The multivariate secant method is used to optimize the discrete directions and their corresponding weights. The numerical integration of polynomials in the direction cosines and the Kobayashi benchmark are used to analyze and verify the properties of these new quadrature sets. Results show that the ICLDFE quadrature sets can exactly integrate the zero-order and first-order of the spherical harmonic functions over one-twentieth of the spherical surface. As for the Kobayashi benchmark problem, the maximum relative error between the fifth-order ICLDFE quadrature sets and references is only -0.55%. The ICLDFE quadrature sets provide better integration precision of the spherical harmonic functions in local discrete angle domains and higher accuracy for simple shielding problems.