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Motin Dylan 광운대학교 방위사업연구소 2020 선진국방연구 Vol.3 No.1
The 3:1 rule has a long history and has been used or criticized by scholars and military alike. The present article attempts to test of the 3:1 rule against historical data. It investigates the validity of the rule, whether expressed in terms of men, tanks, artillery, or combat power, by using and expanding data of past battles. Contrary to what has been stated by numerous researchers and by official publications, this study comes to the conclusion that the 3:1 rule has little applicability. This result has major implications concerning military planning and warfighting.
Toward a Neorealist Theory of Unification : Balance of Power and Unification Type
Dylan Motin Ewha Institute of Unification Studies 2023 Journal of peace and unification Vol.13 No.1
Although numerous studies discussed divided nations and their (non-)unification, few applied neorealist insights to explain the phenomenon of national unification. In this article, I show that peaceful unification is possible only under rare circumstances. A would-be unifier must enjoy a favorable power imbalance both at the level of great power politics and among the divided states. If a balance of power exists, either unification does not happen, or only armed unification will occur. After conceptualizing unification and proposing a theory of unification type, I describe the balances of power in seven cases of divided states taken from the nineteenth to the twentieth centuries (1861 Italy, 1871 Germany, 1975 Vietnam, 1990 Yemen and Germany, contemporary Korea and China). This article matters for understanding Korea’s enduring division and developing international relations theory.
Optimal PAM Control for a Buck Boost DC-DC Converter with a Wide-Speed-Range of Operation for a PMSM
Abdul Motin Howlader,Naomitsu Urasaki,Tomonobu Senjyu,Atsushi Yona,Ahmed Yousuf Saber 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.5
A pulse width modulation-voltage source inverter (PWM-VSI) is used for variable speed permanent magnet synchronous motor (PMSM) drives. The PWM-VSI fed PMSM has two major disadvantages. Firstly, the PWM-VSI DC-link voltage limits the magnitude of the PMSM terminal voltage. As a result, the motor speed is restricted. Secondly, in a low speed range, the PWM-VSI modulation index declines. This is caused by a high DC-link voltage and a low terminal voltage ratio. As a result, the distortion of the voltage command and the stator current are increased. This paper proposes an optimal pulse amplitude modulation (PAM) control which can adjust the inverter DC-link voltage by using a buck-boost DC-DC converter. At a low speed range, the proposed system can reduce the distortion of the voltage command, which improves the stator current waveform. Also, the allowable speed range is extended. In order to verify the proposed method, experimental results are provided to confirm the simulation results.
South America Off Balance? Aggregate and Military Power in International Politics
Dylan Motin(모틴 딜런) 강원대학교 사회과학연구원 2021 사회과학연구 Vol.60 No.2
비록 브라질이 인구와 경제 면에서 남아메리카의 지배적인 국가이지만, 다른 남미 국가들은 브라질의 패권추구 가능성에 대하여 걱정하지 않는 것처럼 보인다. 국제관계학의 현실주의 이론이 예견하는 것과는 달리, 브라질에 대한 균형화는 아직 일어나지 않았다. 이 연구의 주요 주장은 남미 국가들이 종합 세력이나 잠재 세력과 균형화 하지 않고 군사력과만 균형화한다는 것이다. 남미 국가들의 종합 세력과 군사력에 대한 데이터를 수집한 후, 브라질이 비록 종합세력으로 우세하지만 이웃 국가들에 대한 압도적인 군사적 위협은 아니라는 것을 보여주고자 한다. 주로 국가들이 육상 군사력과 균형화하기 때문에, 다른 남미 국가들은 현재로서는 브라질의 전반적인 우위를 두려워할 이유가 없다. 따라서, 이 연구는 국제 관계 이론과 남아메리카의 국제 정치 이해에 대한 함의가 많다. Although Brazil is the dominant power of South America in terms of population and economy, other South American states do not appear worried by a potential Brazilian bid for hegemony. Contrary to what realist theories of international relations would predict, balancing against Brazil has yet to occur. This study’s main argument is that South American states do not balance against aggregate or aggregate power but against military power; after building a dataset of the aggregate and military power of South American states, I show that Brazil, although dominant in aggregate terms, is not an overwhelming military threat to its neighbors. Since states primarily balance against land military power, other South American states have no reason to fear Brazilian overall superiority for now. Accordingly, this study has implications for international relations theory and for understanding the international politics of South America.
The Fault in Our Stars? Korea’s Strategy for Survival and Germany’s Rise, 1876-1910
( Dylan Motin ) 서울대학교 규장각한국학연구원 2022 Seoul journal of Korean studies Vol.35 No.1
Observers often attribute the disappearance of Korea in 1910 to the failure of Korean elites to modernize the country. Yet, this explanation overlooks both Korea’s foreign policy and the international power shift ongoing during the early twentieth century. Accordingly, this study uses international relations theory to shed new light on the Japanese annexation of Korea. First, it shows that the international strategy of Joseon and the Korean Empire corresponds to buck-passing, a cost-effective strategy for weak states. Second, it argues that the rise of German power during the 1900s forced the great powers to focus their attention on Europe. In doing so, they left Korea with no one to catch its buck and vulnerable to a Japanese takeover. Therefore, this article enriches both Korean historiography and the understanding of the strategies of small states.
Polarity and War: The Weak Case for the Bipolar Stability Theory
Dylan Motin 서울대학교 국제학연구소 2020 Journal of International and Area Studies Vol.27 No.1
The idea that bipolarity is more stable than multipolarity has become dominant in the last decades. However, few studies have used historical cases of bipolarity for supporting or contradicting this theory. This paper briefly describes all the known cases of bipolar systems in history, with their duration, the distribution of power, and major wars. It then compares the occurrence of major war under both bipolarity and multipolarity. The results of this study show that bipolar systems are more unstable than multipolar ones.
Optimal PAM Control for a Buck Boost DC-DC Converter with a Wide-Speed-Range of Operation for a PMSM
Howlader, Abdul Motin,Urasaki, Naomitsu,Senjyu, Tomonobu,Yona, Atsushi,Saber, Ahmed Yousuf The Korean Institute of Power Electronics 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.5
A pulse width modulation-voltage source inverter (PWM-VSI) is used for variable speed permanent magnet synchronous motor (PMSM) drives. The PWM-VSI fed PMSM has two major disadvantages. Firstly, the PWM-VSI DC-link voltage limits the magnitude of the PMSM terminal voltage. As a result, the motor speed is restricted. Secondly, in a low speed range, the PWM-VSI modulation index declines. This is caused by a high DC-link voltage and a low terminal voltage ratio. As a result, the distortion of the voltage command and the stator current are increased. This paper proposes an optimal pulse amplitude modulation (PAM) control which can adjust the inverter DC-link voltage by using a buck-boost DC-DC converter. At a low speed range, the proposed system can reduce the distortion of the voltage command, which improves the stator current waveform. Also, the allowable speed range is extended. In order to verify the proposed method, experimental results are provided to confirm the simulation results.
Howlader, Abdul Motin,Urasaki, Naomitsu,Yona, Atsushi,Senjyu, Tomonobu,Saber, Ahmed Yousuf Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.2
Wind is an abundant source of natural energy which can be utilized to generate power. Wind velocity does not remain constant, and as a result the output power of wind turbine generators (WTGs) fluctuates. To reduce the fluctuation, different approaches are already being proposed, such as energy storage devices, electric double layer capacitors, flywheels, and so on. These methods are effective but require a significant extra cost to installation and maintenance. This paper proposes to reduce output power fluctuation by controlling kinetic energy of a WTG system. A MW-class pitch-regulated permanent magnet synchronous generator (PMSG) is introduced to apply a power fluctuation reducing method. The major advantage of this proposed method is that, an additional energy storage system is not required to control the power fluctuation. Additionally, the proposed method can mitigate shaft stress of a WTG system. Which is reflected in an enhanced reliability of the wind turbine. Moreover, the proposed method can be changed to the maximum power point tracking (MPPT) control method by adjusting an averaging time. The proposed power smoothing control is compared with the MPPT control method and verified by using the MATLAB SIMULINK environment.