International competition to develop and secure cutting-edge and innovative space-based technologies has been intensified as military and commercial significance of and dependence on space grew. Especially, the so-called Forth Industrial Revolution―disruptive innovation technologies, their converging development with existing technologies, services, and platforms, which substantially reduce costs and create new values―affects competition over space-related technologies and their innovation. This study takes a closer look at innovative developments in space technologies― space mobility, satellite technologies, and global navigation satellite system― with a focus on the U.S.-China competition in outer space. It demonstrates that this competition exacerbates space security dilemma because of the dual use nature of space technologies, the difficulties in distinguishing offensive capabilities from defensive capabilities, and the benefits of offense vis-a-vis defense. Furthermore, it might be very difficult to escape this space security dilemma due to the lack of effective space governance.

The purpose of this study was to find out what caused the Duterte administration to decide and suspend the abrogation of the VFA, and to analyze or interpret it closely. Furthermore, in the case of research methodology, it basically relied on the literature research method, but the author directly presented an 'analytical framework' to attempt logical analysis and interpretation within the framework. In the result of research, the Duterte administration's abrogation issue of the VFA was analyzed and interpreted from the perspective of foreign affairs, security, economy, trade, investment, and OFW's remittances.

The Korean War was the first major hot war in the Cold War era, which made the great powers deeply aware of the need for a limited war. Technically, the Korean War has not ended. In the case of an all-out war, South Korea sets a goal of defeating attack from North Korea and eventually achieving unification. Accordingly, the objective of military strategy is to occupy the entire North Korean territory based on total war concept. However, anticipated catastrophic damage, North Korea's use of nuclear weapons and possibility of third-party military intervention call for a cold-hearted review of plausibility of existing objectives and strategies. Military strategies can change depending on political objectives which could be affected by combinations of various factors such as political decision, North Korea's war strategy, US-ROK alliance and neighboring countries' strategy. If the political objective and military strategy are too rigid, it will be difficult to take dominance of the war and finish the war under favorable conditions. In recognition of these problems, this article argues that the concept of limited war should be applied to develop military strategy.

This paper analyzes North Korea's space programs that influence recent North Korea ICBM and missile tests such as the Hwasong-14/15. This paper researches North Korean news reports, foreign scientist papers and Korean studies to provide objective and scientific point of views. It intends to analyze North Korean space capability and intention of space development, and threats.
North Korea started a space program to develop long-range missiles to deliver nuclear bombs. North Korea insists on the right of peaceful space development based on the UN Treaty. Because the outcome of the space program influences successful ICBM development, South Korea needs to set up countermeasures to defeat North Korean provocation with ICBM. First, South Korea understands the intent of North Korea's space development and enhances space surveillance capability. Second, it builds up military protection measures against North Korea space threats. Third, South Korea enhances national space power to maintain space priority over North Korea. This paper will provide an objective and scientific perspective on North Korea space development, threats and consensus for this study area.

This paper aims at the analyses of Chinese Strategic Support Force(SSF), its cyber capabilities. And this research plans to offer significant implications for Korean security. Cyber operation of China has been well known its vivid activities. In 2015, Chinese military has established the Strategic Support Force, including Network System Department for cyber operation. In this paper, the authors analyze mission, organization and capabilities of the Network System Department. The primary missions of the force are for strategic information support and implementing information operation. On the viewpoints of cyber operation, establishing SSF has contributed to facilitate the effectiveness of the cyber operation, Further, the authors argue that it has significant influences on Korean military as well as the U.S. Forces in Korea, directly and indirectly.

For the purpose of achieving the required performance level of the military equipments, not only proper maintenance activities, but also timely product improvement programs are necessary within the life time of the equipments.
The Ministry of National Defense currently reports that combined execution policy of depot maintenance activities and product improvement programs with some military equipments turns out remarkable decrease of budget amount at the operating stage. However, while keeping each activities under the independent rule, organization and budget program, such combined execution policy barely can carry out further and deeper. Using the FGI(Focus Group Interview) and AHP(Analytic Hierarchy Process) consecutively, we could conclude the key common decision factors for both depot maintenance activities and product improvement programs. Furthermore, this study suggests that utilizing those common decision factors at the beginning stage, where constructive outcome would significantly grow.

Since the 120-millimeter self-propelled mortar will be powered by tank battalions to improve the combat power of mechanized units, the information about the munition's effect is needed to know how many munitions are required. Because of the limit of test on ammunition effectiveness in the actual environment, this study is executed by using analysis model named FEAM that can best describe the actual battlefield environment operating the self-propelled mortar. And the number of experimental factors and levels such as shooting method, target type, and topographical condition is very large in combat experiment, and a constant amount of experiments repeated in one scenario is required due to according to probabilistic characteristics of analysis model. Therefore, statistical technique and simulated method are applied on this study to reduce the number of experiments and difficult to execute in the real world.

Local communities that had limited urban development due to the long presence of the US forces in South Korea are expecting growth and development through the base return. As there are dozens of bases to be returned and the development plans are constantly being reviewed, it is necessary to investigate how the local communities will change after the USFK bases are returned. In this study, case studies of Camp Hialeah and Camp Castle were analyzed to examine the changes in the local communities. Through the time series analysis, changes in the land price, population, number of businesses, and number of workers were compared between two local communities and their upper administrative areas. As a result, it was confirmed that the urban development projects returning from the military bases have a positive effect on the local communities. In other words, the population has flowed into the local communities and the number of businesses and the number of workers have increased after returning from the USFK bases. Besides, land prices around the bases have increased and various development projects could be actively promoted.