For the last two decades and more, China has been a constantly rising power, but the U.S. policy toward China has shown fluctuations. What we need is a theoretical framework to understand the variation against a constant rise of another great power. Two variables are added: (1) America's strategic priority and (2) attitude toward globalization. The Bush and the Obama administrations were positive over globalization, but they differed in the strategic priority. The Trump administration prioritized the Chinese threat on the top of agenda, while it was hostile toward globalization. The Biden administration is not positive with globalization, but it might be distracted out of China in strategic priority due to Russia's war in Ukraine. Washington would present a series of issues for Korea in trade and investment for anti-globalization as well as its policy toward North Korea for strategic distraction.

Wars between Russia and Ukraine use a variety of cyber means. This war is a fusion war between hacktivists and big tech companies. Reflecting on and applying our present in this war is an important task. To this end, literature research was conducted using public data such as case analysis, reports.

Why did Japan actively promote the revival of the Japan-US-Australia-India Quadrilateral Security Dialogue (Quad) as its new regional cooperation platform? And How could they succeed in convincing others to join? This article focuses on the shift in Japan's pursuit of reputation in the security realms and the need to balance against China as US's presence in the region is in relative decline. In this article I insist that the change of Japan's pursued reputation from 'non-military power' to 'reliable security partner' in the regional/international community is the reason that Japan could convince other regional partners and lead the revival of Quad. This argument is based on the logic of the cooperation and reputation. Cooperation needs information about potential partner's intention, and reputation of potential partners contains observable information, especially whether they are trustful or not. In other words, reputation is an important causal mechanism for emergence of multilateral cooperation, especially when it comes to the question of 'whom to cooperate with'. This is the reason why Japan's reputation or change of the reputation is key to the emergence of Quad.

This study diagnoses the opportunities and risk factors related to the pursuit of defense digital transformation, and proposes a strategy for building an infrastructure of blockchain technology and implication as a base technology for building a digitalized defense force. The scope of the study was to analyze the usage status of blockchain and technology development trends in the defense field of global countries. Diagnosed the reason why blockchain technology does not get power in Korea defense field. Based on this, the defense utilization strategy was proposed, such as the utilization of blockchain in the field of operation, support, and security in the defense and the establishment of infrastructure. The research result is expected to be an option for defense digital transformation and technological hegemony response of global countries.

In this paper, we analyzed the spread of SARS-CoV-2(COVID-19) in the military through mathematical modeling. Since the omicron variant became dominant in 2022, the number of confirmed patients in the Korean military has soared, raising the need for mathematical research on the spread of COVID-19 in the military. This study verified the causality of the propagation patterns of civil society and military through Granger causality verification, and numerically analyzed the propagation patterns of military and civil society during a specific period by applying an compartmental model. Through this, it was possible to numerically estimate the characteristics of COVID-19 diffusion in the military.

This study presents a case-based reasoning(CBR)-based method that supports the selection of appropriate similar cases for the review of the unit cost in total project cost analysis. CBR is a technique for solving new problems by retrieving and revising the similar cases in the data set. This method was developed by applying the “retrieving” of CBR. First, the similarity measurement model for retrieving was identified by defining attribute importance and weights. Second, the model computes the case similarity scores. Finally, using the similarity score as an index, the method select the most similar cases from the data set. Based on administrative project case studies, the proposed method was validated.