지열 - 태양열원 복합에너지시스템의 경제성 평가모형에 관한 연구

우남섭(Namsub Woo),황인주(Inju Hwang) 대한설비공학회 2005 대한설비공학회 학술발표대회논문집 Vol.2005 No.6

컴포지트 비디오 디코더를 위한 웨이블릿 기반 3차원 콤 필터의 설계

김남섭(Namsub Kim),조원경(Wonkyung Cho) 한국멀티미디어학회 2006 멀티미디어학회논문지 Vol.9 No.5

소련과 냉전: Vladislav M. Zubok, A Failed Empire: The Soviet Union in the Cold War From Stalin to Gorbachev, 2nd ed.(Chapel Hill, NC: The University of North Carolina Press, 2009)의 비판적 검토

김남섭 ( Namsub Kim ) 한국서양사연구회(구 서울대학교 서양사연구회) 2016 서양사연구 Vol.0 No.55

This paper aims to do a critical review on A Failed Empire, one of the recent works of Vladislav M. Zubok, which has been much admired by the specialist and generalists alike as a challenging account of the Soviet side of the Cold War. The book has many strengths as an overview of Soviet foreign policy. In particular, it stands out clearly in using widely various archives, memoirs, interviews and available published primary sources, although Zubok has attempted to write a comprehensive history that spans the entire period of the Cold War. Moreover, the author made many efforts to explain the history of the Soviet Cold War through an impressive theoretical framework, which is called `the revolutionary-imperial paradigm.` According to him, the postwar Soviet leadership through the era of Brezhnev failed to achieve peaceful settlements with America, another superpower, by firmly having kept this paradigm. However, Gorbachev, the last Soviet leader, rejected it flatly, presenting `New Thinking` as an alternative diplomatic principle in international relations, and as a result, the animosity and confrontation between two superpowers ended without much bloodshed. On the other hand, the book reveals several weaknesses. Zubok often misinterprets materials in supporting his arguments and tends to ignore important theses by other scholars, not analysing closely. Furthermore, he overemphasizes the role of ideas, in particular, of Soviet leaders when they behaved in the international arena. For example, Zubok gives too much value to Brezhnev`s belief in peace, when he tries to examine his detente. Likewise, Zubok argues that `New Thinking` of Gorbachev played a decisive role in ending the Cold War. Such an analysis by the author resulted frequently in downplaying the structural limitations, such as political, military and economic difficulties on the domestic and international levels, which, sometimes, the Soviet leaders as an individual politician hardly could get over. Moreover, Zubok does not discuss in earnest social and cultural dimensions of the Soviet side of the Cold War. Particularly, he almost failed to examine the Cold War experiences of the Soviet grassroots. For better work, he should have considered more carefully how the international developments affected the Soviet general public and, in turn, how they responded to the Cold War policies of the Soviet governments. (Seoul National University of Science & Technology/namsubkim@ seoultech.ac.kr)

스탈린 대테러의 배경과 원인에 관한 재고찰

김남섭 ( Namsub Kim ) 한국서양사연구회 2017 서양사연구 Vol.0 No.57

This article aims to give a progress report of the academic studies about Stalin’s Great Terror in 1936-38, particularly its causes, by doing a critical review on The Anatomy of Terror: Political Violence under Stalin, edited by James Harris in 2013. Although many Western historians have written a lot of serious books and articles about Stalin’s Great Terror since 1960s, there is still no consensus among them on why Stalin killed almost seven hundred thousand Soviet elites and ordinary people in only two years. Fifteen authors in The Anatomy of Terror also present various explanations about this question. We can divide their sixteen contributions into three categories according to types of the terror’s causes which they emphasize. Firstly, some scholars stress ‘excisionary violence’, ‘Chekist mentalite’ and intelligence and threat ‘misperception’ as long-term preconditions of the Great Terror. The second group of authors proposes Kirov murder, historical origins of mass repressions and conflicts among political police, civil police and judiciary as mid-term causes. The last group considers fear and anxiety of the provincial party leaders about the impending Soviet elections, participation of the masses in the process of purges and Stalin’s personal mental illness as immediate short-term evens or situations which triggered off the terror. However, in my view, all contributors failed to offer a comprehensive explanation about reasons for Stalin’s Great Terror. In order to explain the terror’s causes more plausibly, we have to consider additionally Khlevniuk and Kuromiya’s consistent arguments that the international political and military crisis in mid-1930s in Europe and Asia brought about within Stalin’s leadership the need for prior elimination of ‘the fifth-column’ as a preventive war. (Seoul National University of Science and Technology/namsubkim@seoultech.ac.kr)

PPG 측정 장치에서의 온도 영향에 대한 연구

김남섭(Namsub Kim) 한국정보전자통신기술학회 2019 한국정보전자통신기술학회논문지 Vol.12 No.3

본 논문에서는 사전 연구로 제작된 손목시계형태의 반사형과 투과형 PPG 측정 장치의 온도 변화에 대한 특성을 고찰하였다. PPG는 신체의 온도 변화에 따라 그래프의 모양이 영향을 받게 되는데 본 논문에서는 신체의 온도 변화가 아닌 측정 장비의 온도 변화에 따른 영향을 고찰하였다. 실험은 기존에 제작된 장치의 마이크로 컨트롤러의 내부 온도를 측정하면서 내부 온도 변화에 따른 PPG의 변화를 관찰하였다. 실험 결과, 사용된 마이크로 컨트롤러의 동작 시간에 따라 온도는 무리함수의 그래프 형태로 변화하였으며 온도 상승에 따라 투과형 측정 장치는 온도에 영향을 받지 않았으나 반사형 측정 장치는 PPG 측정 결과에 변화가 발생함을 확인하였다. This paper presents the temperature dependence of transmission-type and reflection-type PPG measurement devices that have been developed in the previous research. PPG signal can be distorted by external temperature such as skin temperature so that many of research was focused on the skin temperature effect. However, this paper focuses on the temperature of the device itself and we studied on the effect of device internal temperature. Experimental results showed that the temperature was increased like an irrational function graph and the transmission-type was not affected by the internal temperature but the reflection-type was affected by the internal temperature.

태양전지를 이용한 유비쿼터스 헬스케어 장치 개발

김남섭(Namsub Kim) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.10

Healthcare function on a sensor node decreases battery life due to increased power consumption. This causes battery exchange problem. In this paper, we present a solar-based ubiquitous healthcare device which supports perpetual operation without exchanging battery. The device has healthcare function such as heart rate detection in addition to the basic function of general sensor node and uses harvest-store-use architecture for harvesting energy. For evaluating the device, we compared the device with previous sensor nodes based on solar energy harvesting. For testing the device, solar energy measurement was conducted for making similar situation in indoor environment. The evaluation and test results show that the device acted as a healthcare node manages energy harvesting and storage perpetually.

고르바쵸프 혁명과 스딸린 체제: 글라스노스찌 시대의 역사 다시 쓰기

김남섭 ( Namsub Kim ) 서울대학교 인문학연구원 2005 人文論叢 Vol.54 No.-

소련-독일 전쟁과 냉전 - 군사-정치 지도자로서 스탈린의 역할 -

김남섭 ( Namsub Kim ) 한국외국어대학교 러시아연구소 2022 슬라브연구 Vol.38 No.2

이 글은 제프리 로버츠(Geoffrey Roberts)의 Stalin’s Wars: From World War to Cold War, 1939-1953을 비판적으로 검토함으로써 스탈린이 제2차 세계대전과 냉전 초기 동안 군사-정치 지도자로서 소련의 안전을 지키기 위해 어떻게 사고하고 행동하였는지를 면밀히 살펴보려는 시도이다. 로버츠는 이 저서에서 제2차 세계대전 동안 스탈린이 군사 지도자로서 “대체 불가능할” 정도로 매우 유능했으며, 전쟁 중은 물론이고 전쟁 이후에도 ‘대연합’을 유지하려고 애를 씀으로써 냉전을 어떻게든 회피하려 했다고 주장한다. 그러나 로버츠의 이 테제는 예컨대, 전쟁 초기는 물론이고 전쟁 후반기에도 스탈린이 계속 저질렀던 군사적 실책들의 중요성을 거의 무시하거나, 스탈린의 사고와 행동에 큰 영향을 미친 공산주의 이념의 역할을 경시하거나, 때로는 스탈린이 모든 외교적 결정을 주도한 것처럼 그의 리더십을 지나치게 강조한 데 바탕을 두고 있다. 그의 주장이 좀 더 설득력을 갖기 위해서는 보다 확실한 증거와 관련 논제들에 대한 더욱 세밀한 고찰이 필요할 것이다. This essay aims to take a close look into what and how Iosif Stalin as a Soviet highest leader thought and acted in order to ensure the security of the Soviet Union during World War Ⅱ and early Cold War, reviewing critically Geoffrey Robert’s Stalin’s Wars: From World War to Cold War, 1939-1953. In his book, Roberts argues that Stalin was very effective and unreplaceable as a warlord, and indispensable to the Soviet victory over Nazi Germany. Also, in Robert’s view, Stalin worked hard to make the Grand Alliance a success and wanted to see it continue after the war, averting the Cold War. But more evidences and deeper researches are required to accept Robert’s more or less bold arguments. His theses are based on almost ignoring Stalin’s wrong military decisions during the Soviet-German War which often led to a national disaster. Moreover, Roberts disregards the important role of communist ideology which made a great impact on Stalin’s mind-set and behavior, depicting him as a completely rational and pragmatic leader. Also Roberts often overemphasizes Stalin’s leadership, as if he alone made a decision on every international issues, without appropriately analyzing the relationships between him and his diplomatic advisors and aids.

손목시계 형태의 투과형 PPG 측정 장치의 구현에 관한 연구

김남섭(Namsub Kim) 한국정보전자통신기술학회 2017 한국정보전자통신기술학회논문지 Vol.10 No.2

본 논문에서는 효율적인 손목시계형 PPG 측정 장치의 구현에 관하여 연구하였다. PPG는 반사형 또는 투과형으로 측정이 가능하며, 일반적으로 손목시계의 형태의 PPG 측정 장치는 반사형으로 구현되기 때문에 동잡음에 취약하다는 단점이 있다. 또한 반사형의 경우 한쪽 손을 고정한 상태에서 다른 손을 사용하여 측정을 해야 하기 때문에 활동성에도 제약이 따른다. 본 논문에서는 기존에 개발된 장치에 클립형의 투과형 센서를 추가하여 손가락에 고정시킴으로써 측정 시 움직임을 최소화하도록 동잡음에 강건하도록 하였고, 한 손으로 측정이 가능할 뿐만 아니라 탈부착이 가능하도록 구현하여 활동성에 영향이 없도록 하였다. 제안된 장치는 측정된 신호를 실시간으로 전송이 가능하기 때문에 스마트 헬스케어 분야에 적합하며 제안된 장치의 성능을 판단하기 위해 기존의 장치와 같은 조건하에서의 측정된 신호를 비교 실험하였다. 실제 심박수 측정이 가능한 파형을 확인한 결과, 제안된 측정 장치는 기존의 장치에 비해 20%의 성능향상이 있음을 확인하였다. This paper presents an effective PPG measurement device in a wrist watch for smart healthcare. PPG can be acquired by measuring absorption of light and PPG measurement device is classified as transmission and reflection type. Reflection type is easy to implement but vulnerable to motion artifact. Moreover, reflection type must use 2 hands at once if the device is implemeted in a wrist watch. This paper describes the implementation of robust transmission type PPG measurement device by using previous developed reflection type device. PPG sensor is clip type and can be separated from the device so that the influence of motion artifact can be reduced. The proposed device can transmit the measured signal in real-time and is useful for smart healthcare. For evaluation of the proposed device, PPG signals are compared with reflection type in the same condition. The results show that the proposed device has 20% improvement in performance.

손목시계 형태의 응급상황 감지장치 개발

김남섭(Namsub Kim) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.4

This paper describes a wrist-worn monitoring system for caring health of elderly people. The system comprises a wearable wrist watch-style device and a PC-based gateway. The wrist-worn device senses the motion of the wearer by using a 3-axes accelerometer and the motion is used for detecting a harmful fall situation. It also has IR sensors to measure a heart rate of the wearer. The output of the sensors transmits to the gateway and the gateway enables a care-giver to monitor the wearer's health information at a remote location. To evaluate the system, we tested the system with respect to the functions and the performance. The results showed that the system had 70% fall detection rate and reliability of the heart rate measurement was found to be acceptable.