The purpose of this study is to present a rational explanation and future prospect of North Korea's diplomacy over the past 30 years. Through this, it reasonably suggests the way of the denuclearization of North Korea and the dismissal of US sanctions against North Korea for meaningful progress in the on-going negotiations of the two.
The factors that determine the future changes such as North Korea's denuclearization desired by the international society are not the regime' intention (state level factor), nor the top leader Kim Jung Eun' decision making (individual level factor). Rather it is North Korea's response mechanism coming from system constraints (yystem level factor) that determine such changes.
North Korea is not an active decision-making body in the Uni-polar world system led by the United States in the post-Cold War era. The US and its allies must recognize it for the progress in the future negotiations on peace settlement on the Korean peninsula.

This article aims at building a macroeconomic stock management model based on the stock management structures in system dynamics and reconstruct macroeconomic variables such as the rate of capacity utilization with the permanent and irregular fluctuations. The Macro Stock Management Model is composed of four feedback mechanisms: two balancing feedback mechanisms of not only the productive firms but also the central authorities such as the central bank, and two self-reinforcing feedback loops of the inventory discrepancies in the productive firms and the private baking system. The model successfully reconstructed the permanent and irregular patterns of the rate of capacity utilization without particular assumptions regarding the exogenous shocks. Moreover, the economic crises, the sudden collapse of economic activities, were reproduced in the model based on changes in the adjustment speed of discrepancies such as those of the rate of capacity utilization or financial sensitivity.

This study deals with the policy of SWM (Solid Waste Management) in Jeju, which is one of the major issues in this region as rapid urbanization and over-tourism has progressed recently. As far as the expectation is concerned that such a trend continues for a few decades, this paper aims at analyzing the consequent impacts to the SWM system and searching for an appropriate direction for the relevant policy in this area. Through elaborating and simulating a quantitative System Dynamics model, the analysis shows as follows: (1) No matter which policy is adopted, the amount of everyday waste would increase. (2) The FPD (Final Processing and Disposal) facilities, such as incinerations and landfill, would have to be increased. (3) The reduction and separation policy could be effective and should be combined with the expansion efforts of the FPD capacity.

In recent decades, lean manufacturing caught the attention of industry and academia. Therefore many researches on the lean transformation have been published. However, the number of researches considering the measurement of the benefit of lean transformation is relatively small. This lack of research caused some hesitation in adopting lean transformation, especially in small and medium sized manufacturing companies. In this research, a simulation model which can measure the benefit of lean manufacturing will be developed so as to compare its benefits under various business environments. Among the various lean transformation tools, this paper deals with the load balancing in a manufacturing cell, which is an essential step in the lean transformation. For the simulation test, system dynamics models which are composed of the process model and the operator model have been developed. Experimental tests comparing the balanced cell with non-balanced cell are performed. Test results are analyzed and some managerial implications are derived from the test results.

The purpose of this paper is to analyze the causal loop structure of educational community building between school and local community. To achieve this, a qualitative study was conducted on cases of educational community building and then the analysis of causal loop structure was performed using qualitative research data.
The results are as follows. First, this study demonstrates the need for the active attention and adequate support of government agencies for participants in the educational community building process. Second, educational community participants should be wary of a goal-oriented short-term approach. Finally, vision and philosophy are needed to build and maintain on educational community.
The conclusion provides some research implications and future research direction about educational community building between school and local community.

The purpose of this paper is to review Master Teacher System based on Systems Thinking perspective using causal loop analysis.
The results are as follows. Master Teacher System is to support the teaching and research activities of the teachers through the activation of the master teacher system and to lead the teachers' efforts to improve the teaching professionalism and to organize the teaching society. However, the virtuous cycle structure pursued by the policy did not appear to be activated, and there were problems such as reorganization and operational confusion, lack of confidence in masters' professional abilities and increased burden of teaching time. This was the primary cause of the neglected factors in policy design and enforcement. The primary reason for this was the lack of legal basis and system for the role and status of the master teachers, teachers' distrust of the master teacher selection mechanism, and the cost of city and provincial office of education and unit school. However, more fundamental factors than these primary causes have limited policy enforcement and achievement of goals. This was due to the secondary cause of the lack of on - site support, seniority culture, and dual structure of schools.
The conclusion provides some research implications and future research direction.