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      • KCI등재후보
      • KCI등재

        확률유한요소 해석에 의한 근접터널 안정성 분석

        김상균,Kim, Sang-Gyun 한국터널지하공간학회 2008 한국터널지하공간학회논문집 Vol.10 No.4

        본 논문에서는 탄소성 유한요소해석 알고리즘과 연계한 확률장 생성기법과 근접터널 조건에서의 파괴확률을 분석하였다. 유한요소 해석을 위한 이산 확률장의 생성은 빠르고 정확하며 랜덤변수의 해상도를 자유롭게 조절할 수 있는 local average subdivision 기법을 사용하였으며 터널모델링을 위해 유한요소 크기와 형상 변화 등을 적절히 고려하여 지반물성치를 적용하는 방안을 제안하였다. 예제해석 조건에 대해 강도정수의 분산정도 및 공간상관길이에 따른 파괴확률을 파악하였으며 결정론적 안정성 해석결과 및 단일랜덤변수 해석결과와 비교하였다. 강도정수의 분산특성에 따라 강도감소기법에 의한 안전율과 단일랜덤변수 해석에 의한 파괴확률의 관계를 규명하였으며 확률유한요소 해석을 통해 공간상관길이가 파괴확률에 미치는 영향을 분석하였다. 이를 통해 강도감소기법에 의한 안전율과 분산계수로부터 단일랜덤변수에 의한 파괴확률을 도출할 수 있었으며 단일랜덤변수 해석결과가 근접터널의 실제적인 파괴확률을 과소평가 할 수 있음을 파악하였다. In this paper, the modeling procedure of random field with an elasto-plastic finite element algorithm and probability of failure on closely-spaced tunnel were investigated. Local average subdivision (LAS) method which can generate discrete random variables fast and accurately as well as change the resolution in certain region was used. And correlated value allocating and weighted average method were suggested to implement geometrical characteristics of tunnel. After the probability of failure on the test problem was thoroughly investigated using random finite element method, the results were compared with the deterministic strength reduction factor method and single random variable method. Of particular importance in this work, is the conclusion that the probability of failure determined by simplified probabilistic analysis, in which spatial variability is ignored by assuming perfect correlation, can be estimated from the safety factor determined by strength reduction factor method. Also, single random variable method can lead to unconservative estimates of the probability of failure.

      • KCI등재

        IQ Imbalance와 위상 잡음을 고려한 OFDM 통신 시스템의 성능 분석

        김상균,유흥균,강병수,이광천,Kim, Sang-Kyun,Ryu, Heung-Gyoon,Kang, Byung-Su,Lee, Kwang-Chun 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.7

        OFDM(Orthogonal Frequency Division Multiplexing) 시스템은 이동성이 있는 고속 데이터 전송에 적합한 전송 방법으로 널리 알려져 있지만, 위상 잡음과 직교 불균형(IQ imbalance)에 매우 민감한 특성을 보이는 단점이 있다. 그러므로, 본 논문에서는 위상 잡음 특성에 따른 위상 잡음 분산을 계산한 다음, 직교 불균형이 있는 OFDM 시스템의 통신 성능을 분석하였다. 시뮬레이션 결과, 위상 잡음의 분산과 직교 불균형의 크기 변화에 따라 통신 성능이 변화하는 것을 분석하였다. 분석 결과, 진폭 불균형이 ${\varepsilon}$=0.2; 0.3; 0.4이고, 위상 불균형이 ${\phi}=10^0$이고, 위상 잡음의 분산 ${\sigma}^2=0.012$일 때, BER은 $10^{-5}$에서 각각 2.88 dB, 3.61 dB, 4.69 dB의 SNR penalty가 존재한다. OFDM system is an excellent high speed transmission method but it is seriously sensitive to the phase noise and IQ imbalance. Therefore, in this paper, we analyze the communication performance of the OFDM communication system with IQ imbalance and phase noise. Phase noise's variance can be calculated by integral calculus of phase noise power spectrum. From simulation results, it can be shown that the BER performances show different change according to the phase noise variance and IQ imbalance amount. When amplitude imbalance is ${\varepsilon}$=0.2; 0.3; 0.4 and phase imbalance is ${\phi}=10^0$, and distribution of phase noise is ${\sigma}^2=0.012$, BER is degraded by 2.88 dB, 3.61 dB, 4.09 dB in $10^{-5}$ in the respect of the SNR penalty.

      • 간경변과 신기능부전

        김상균 대한간학회 2015 간학회 싱글토픽 심포지움 Vol.2015 No.1

        Renal function in patients with liver cirrhosis gradually decreases in accordance with progression of liver disease. Hepatorenal syndrome (HRS) is typified by a gradual decline in renal function that develops in the setting of diuretic-resistant ascites and avid sodium retention. Initially splanchnic vasodilation, subsequently increased endogenous vasoconstrictor, and increased systemic inflammatory responses are likely to progress to renal failure. An inadequate increase in cardiac output relative to the fall in vascular resistance also contributes to the development of hepatorenal syndrome. The definition and classification of HRS has been changed as the recent improved knowledge regarding pathophysiology and natural course provided new insights into the indication of newer therapeutic intervention depending upon underlying etiology. Here, we are going to see what it is.

      • KCI등재

        여성살인범의 심리적 특성에 관한 연구 - 분노특성을 중심으로 -

        김상균 한국경호경비학회 2001 시큐리티연구 Vol.- No.4

        The aim of this study is to investigate the anger characteristics and the social psychological characteristics of Homicide by Female. With SPSS win program I analyzed 80 female murderers caught in the correction facility. The analysis results are as follows : Firstly, the age bracket of the female murderers is very high in their thirties(47.5%), they didn't almost graduate from the middle-school(65%). Secondly, they almost married(92.5%) and their job was the housekeeper(52.5%). Thirdly, the female murderers almost killed their husbands(45%) and other victims was people who was familiar with the female murderer. Fourth, the offenders were afraid that the victims had the responsibility for murder(87.5%). Fifthly, according to above analysis, the character type female murderers was almost anger-in type. Finally, My analysis shows us that the anger characteristics between offenders and victims was very similar. With the above research results, I can understand the socio-psychological characteristics of the female murderer. However, this paper has some problems which is the limit of the sampling range and the generalization of research results. In addition, we need to study the comparison with male murderers and female murderers.

      • SCOPUSKCI등재
      • KCI등재후보

        보수 신문의 천안함 침몰사건의 보도에 관한사례 연구: 대항적 프레임은 어떻게 사라져갔는가?

        김상균 국민대학교 사회과학연구소 2020 社會科學硏究 Vol.32 No.2

        This paper looks into how the conservative newspapers have treated theso-called counter frames, other than the ‘North Korean culpability’ frame as adominant one of the conservative government. Following the incident, there havebeen reasonable and scientific theories from collective intellectuals, including thosethat cited running aground, fatigue destruction, submarine collision, and sea-mineexplosion as possible causes of the sinking. Through our own research, we havefound that the conservative newspapers have distorted, downplayed, dismissed orignored these scientific and reasonable 'counter-frames,' except the ‘North Koreanculpability’ frame. Some US-based scientists or civic activists who have suggestedreasonable alternative theories were even subjected to libel lawsuits, surveillance orredbaiting. Through this campaign, the conservative newspapers have helpedestablish and solidify ‘North Korean culpability’ as the dominant frame. Thetheoretical and practical implications of this paper are as follows. First, theconservative newspapers’ coverage of the ‘Cheonan Sinking Incident’ fell greatlyshort of meeting the principles of verification and truth-telling. They have workednot for the benefits of citizens but for the interests of their owners and the power, disregarding the voiceless people. Second, the cause of the ‘CheonanSinking Incident’ has been a stumbling block between South and South, Southand North Korea. It is most urgent to launch a re-investigation of the Cheonanincident by the 21st National parliament to find out truths about what caused thesinking of the ship. 이 논문은 보수신문이 천안함 피격사건에 대한 보수정권의 지배적 프레임으로서 ‘북한소행설’ 이외 시민사회에서 주장하는 대항적 프레임에 대해 어떻게 보도해왔을까 하는 것을탐구하고자 한다. 천안함 사건에 대한 정부의 지배적 프레임은 민군합조단이 5월 20일 중간 조사결과에서발표하고 9월13일 천안함 피격 사건 합동조사결과 보고서에서 최종적으로 기술한 바와같이 “천안함(초계함)이 북한 어뢰 공격에 의해 침몰했다”는 ‘북한 소행설’이다. 반면, 천안함 사건에 대한 시민사회의 대항적 프레임은 다음과 같다. 천안함 사건 발생 이후 집단지성은 좌초설, 피로 파괴설, 잠수함 충돌설, 기뢰 수중폭발설 등 다양한 과학적 ․합리적 의견을 제시해왔다. 연구의 결과, ‘북한 소행설’ 이외의 과학적․합리적인 대항 프레임에 대해 보수신문은 왜곡하거나 축소하고, 배제하거나 무보도 해왔음이 드러났다. 심지어 합리적으로 의문을 제기하는 재미과학자나 시민활동가들을 ‘명예훼손’이나 사찰, 특히 ‘친북’, ‘종북몰이’의 대상으로몰아왔다. 이를 통해 보수신문은 ‘북한 소행설’을 지배적 프레임으로 고착화해 왔던 것이다. 본 연구의 이론적 현실적 함의는 다음과 같다. 첫째, 보수신문의 천안함 침몰 사건의 보도는 진실과 사실검증의 원칙에서 크게 벗어나 있다. 그들은 시민의 복지를 위해 일하는 게아니라 사주와 권력자의 이익에 복무하며 목소리 없는 사람들을 외면하고 있다. 둘째, 남남,남북 간의 걸림돌이 되어온 천안함 침몰사고의 원인. 앞으로 21대 국회가 개원하면, “두 번열리고 활동을 마감한 국회 천안함 조사특위”를 다시 가동하여 집단지성이 주장해온 합리적 과학적 의견에 대한 과학적 재조사가 긴급히 요청된다.

      • KCI등재

        A Comparative Study on Adolescent Legal Consciousness

        김상균 원광대학교 경찰학연구소 2013 경찰학논총 Vol.8 No.2

        One of the most troubling developments of our society in recent days is the rapid increase in criminal and antisocial behaviors. In order to study legal consciousness and deviations of adolescents, this paper intends to approach the subject within the frameworks of two legal socialization theories-the developmental theory of legal consciousness, and the social learning theory. This study seeks to not only suggest deviance-preventive and legal educational implications, but also to shed light on thoughts on adolescence delinquency in different countries including Singapore, Mexico, and the United States, which in itself seems to be a valuable attempt. In the light of these findings, it can be surmised that Korean adolescents in general are negative in their outlook towards the fairness and justice of the law. Their knowledge of and confidence in the law were equally discouraging. These striking phenomena suggest that Korean adolescents are influenced by their elders’ less-than-exemplary behaviors and cynical attitudes toward law-abidance. Furthermore, they are indicative of the malfunctioning of our current school education system, which consistently fails to inculcate in them moral values and respectable personalities. Therefore, it is imperative that our national and judicial authorities earnestly establish legal order through exemplary law enforcement, and our educational scenes on their part develop various programs that can help foster firm legal consciousness. One of the most troubling developments of our society in recent days is the rapid increase in criminal and antisocial behaviors. In order to study legal consciousness and deviations of adolescents, this paper intends to approach the subject within the frameworks of two legal socialization theories-the developmental theory of legal consciousness, and the social learning theory. This study seeks to not only suggest deviance-preventive and legal educational implications, but also to shed light on thoughts on adolescence delinquency in different countries including Singapore, Mexico, and the United States, which in itself seems to be a valuable attempt. In the light of these findings, it can be surmised that Korean adolescents in general are negative in their outlook towards the fairness and justice of the law. Their knowledge of and confidence in the law were equally discouraging. These striking phenomena suggest that Korean adolescents are influenced by their elders’ less-than-exemplary behaviors and cynical attitudes toward law-abidance. Furthermore, they are indicative of the malfunctioning of our current school education system, which consistently fails to inculcate in them moral values and respectable personalities. Therefore, it is imperative that our national and judicial authorities earnestly establish legal order through exemplary law enforcement, and our educational scenes on their part develop various programs that can help foster firm legal consciousness.

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