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방향성을 고려한 밀도 기반 클러스터링 기법에 관한 연구
김진만,국중진,Jinman Kim,Joongjin Kook 한국반도체디스플레이기술학회 2024 반도체디스플레이기술학회지 Vol.23 No.2
This research proposed DBSCAN-D, which is a clustering technique for locating POI based on existing density-based clustering research, such as GPS data, generated by moving objects. This method is designed based on 'staying time' and 'directionality' extracted from the relationship between GPS data. The staying time can be extracted through the difference in the reception time between data using the time at which the GPS data is received. Directionality can be expressed by moving the area of data generated later in the direction of the position of the previously generated data by concentrating on the point where the GPS data is sequentially generated. Through these two properties, it is possible to perform clustering suitable for the data set generated by the moving object.
머리 착용형 6축 가속도계를 사용한 심탄도 심박수 측정
김진만,국중진,Jinman Kim,Joongjin Kook 한국반도체디스플레이기술학회 2024 반도체디스플레이기술학회지 Vol.23 No.2
Recently, wearable virtual reality devices are widely used. These instruments include a 3-axis accelerometer. User's heart rate information in virtual reality contents can be useful for measuring user experience. In this paper, we propose a method to measure the heart rate through a 3-axis accelerometer based on the principle of ballistocardiography without additional sensors. The angular velocity was successively measured in a time series by the 3-axis accelerometer mounted to the head. The frequency of the maximum magnitude is determined as the heart rate through frequency transform and band pass filtering of the time series signal. For verification, the heart rate calculated from photoplethysmography sensors acquired at the same time was compared as ground-truth. In the virtual reality, the user's heart rate information can be extracted without additional heart rate sensor, and the emotional state and fatigue can be measured.
COVID-19 확산에 따른 통행 수단 선택 변화 분석 : 서울시 사례를 중심으로
김진만(Kim, Jinman),기동환(Ki, Donghwan),이수기(Lee, Sugie) 대한국토·도시계획학회 2021 國土計劃 Vol.56 No.3
The transition to a non-contact society after the outbreak of COVID-19 is having a substantial impact on people’s lifestyles and travel behavior. This study aimed to analyze the changes in travel mode choice caused by the spread of COVID-19. Specifically, it investigated how the spread of the virus affected the ridership of public transportation, personal vehicles, and shared bicycles. In addition, the impact of COVID-19 was examined by dividing ridership into weekdays and weekends. The analysis showed that there were significant changes in the ridership of transportation modes by the diffusion stage of COVID-19. In particular, in the case of public transit such as subways and buses, the decrease in usage was found to be significant compared to other modes. On the contrary, the usage of personal vehicles and shared bicycles either barely decreased or even increased. Considering that telecommuting was partially implemented due to COVID-19, it can be assumed that individuals who took public transportation switched their mode to car or bicycle. The results of this study could be useful in understanding people’s travel behavior regarding mode choice during a spreading epidemic, such as COVID-19. Also, this study could be used to establish public transportation policies and mobility improvement strategies during the pandemic condition.
김진만 ( Kim Jinman ) 대한정치학회 2020 大韓政治學會報 Vol.28 No.3
이 연구는 선제적 자위전의 정당화 가능성과 더불어 그 정당성의 합리적 근거들을 탐구하고 인식의 틀을 구성하였다. 선제적 자위전의 정당화와 관련하여 세 가지의 범주로 인식의 틀이 구성될 수 있다. 첫째, 국가이익의 측면에서 선제적 자위전을 정당화시킬 수 있다. 이 관점에서는 선제적 자위전이 국제관계에서 국가이익을 촉진하기보다는 오히려 세계평화에 위협이 되고 국제사회를 불안정하게 만듦으로써 손상을 주거나 감소시킬 수 있다. 둘째, 국제법과 국제조직의 틀에서 선제적 자위전의 정당화 문제를 다룰 수 있다. 국제법에 따르면 자위전은 불법적 전쟁에 대한 반격으로 간주된다. 국제연합안전보장이사회의 국가가 선제적 자위전에 연루될 수도 있는 까닭에 이해관계가 걸린 교전 당사국이 일으키는 선제적 자위전이 국제법에 의해 정당화될지는 의문이다. 셋째, 선제적 자위전은 도덕원리를 통해 조명되는 방식으로 접근할 수 있다. 이러한 윤리적 인식은 국가안보가 위기에 처해 있거나 국가 존망이 경각에 달려있는 상황이 충분히 있을 수 있다는 가정에서 출발한다. 객관적이고 자명한 위기에 임박하여 선제 타격이 의심의 여지 없이 합법적 자위라는 것은 이 관점에서는 명백하다. 정당한 전쟁에 대한 도덕원리를 선제적 자위전에 응용하려는 시도는 편향되지 않은 객관성과 보편성을 지향하는 것으로 복잡 다양한 국제환경이나 유동적인 정치 상황에 영향을 받지 않는다. The objective of this paper is to examine the potential to justify anticipatory self-defense and lay out the reasonable bases with the validities on it. Being relevant to the justification of anticipatory war, the frames which we understand it falls into three categories. Firstly, we can appreciate the justification of anticipatory war in terms of national interest in international relations. In this viewpoint the anticipatory war face the problem that it may result in not promoting national interest but harming or lessening it by threatening world peace and making international society unstable. Secondly we can also address it in the framework of international law and organization. International law would simply regard self-defense as a counter-war against an illegal war. It remains open to doubt whether international law always allows the anticipatory war to be brought about by a belligerent power, since some states of UNSC may be involved in the war. Thirdly the justification of anticipatory war can be approached in the way that it can be examined through our moral sense. This ethical viewpoint begins from the premise that there may well be the situation which the national security is on the brink of a precipice by threat of the enemy, or which the very existence of a state is at stake. With respect to moral judgment, it is obvious that preemption strike is unquestionably legal self-defense in the face of an unfolding and self-evidently imminent threat. Trying to put the moral principles of just war theory to practical use of justification of anticipatory war aims to seek unbiased objectivity and universality, which is not influenced by a complicated global environment and a fluid political situation.
초내열성 절연 컴파운드를 사용한 케이블의 송전용량 증대
김진만(JinMan Kim),한봉수(BongSoo Han),김영준(YoungJun Kim),박상완(SangWan Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10
기존의 전력 케이블용 절연체로 가장 넓리 사용되고 있는 XLPE는 최대 연속 사용온도가 90 인관계로 허용전류의 측면에서 제한적인 요소를 가지고 있다. 이는 대용량 부하를 필요로 하는 대도시 밀집 지역에서는 그 부하용량을 충족시킬 수 있는 대용량 케이블이 필요하게 되는데, 이를 해결하기 위해서는 도체 단면적을 키우거나 케이블의 최고 사용온도를 높여야 한다. 본 논문에서는 케이블의 절연체의 내열성을 증가시켜 최고 사용온도를 높임으로서 케이블의 송전 용량을 증대 시키고자 한다.