• KIPS Transactions on Computer and Communication Systems
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• v.3 no.3
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• pp.63-72
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• 2014

The exchangeable battery electric bus is an eco-friendly public transportation vehicle. Due to the technological limitation, however, it should repeatedly change batteries with charged ones. The unmanned battery exchangeable electric bus being studied in Korea can exchange batteries automatically by using a battery swapping system. In this paper, we propose an unmanned battery exchangeable electric bus management system. The proposed system provides two services: the bus information service and the battery change scheduling service. The bus information service is the existing traditional metropolitan area bus information systems, which inform bus passengers how long they should wait for the buses. Our second service assigns a low-battery bus, which needs to change the batteries, to the battery swapping system, which stores fully-charged batteries. To validate the proposed system, we model the system by using the DEVS formalism. The simulation result shows that the proposed system provides the services properly.

• Journal of the Korean Institute of Gas
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• v.14 no.4
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• pp.6-11
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• 2010

The continuous fatal accidents like explosion or fire cause huge losses of both life and property in laboratories even though safety management system has been built and periodical checkups and safety diagnosis have been implementing in universities and enterprise-affiliated research institutes since Act on the Establishment of Safe Laboratory Environment was enacted in 2005 to prevent accidents in research laboratories. Cause analysis and safety management measures to prevent recurrence of accidents are urgently needed because accidents in research laboratories occur repeatedly with similar contents. This study will show results of analysis on incidents and accidents occurred in laboratories in universities and enterprise-affiliated research institutes using Root Cause Analysis Method and propose classified map of cause investigation and improvements so as to improve safety management in research laboratories.

• Proceedings of the Korea Society for Simulation Conference
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• 1992.10a
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• pp.9-9
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• 1992

시뮬레이션(simulation)은 실 시스템(real system)의 효과적이고 효율적인 운영을 도모하기 위하여 실 시스템의 동작을 이해하고 분석, 예측, 평가하는 과학적인 문제해결 접근방법이다. 시뮬레이션 수행단계는 실 시스템의 행위를 정확히 반영하도록 타당한 모델을 구축하는 모델링 단계와 모델에 의도하는 명령어들을 컴퓨터 프로그램으로 작성하는 구현단계로 나누어진다. 시뮬레이션 모델은 시간, 상태, 확률변수, 상호규칙 등의 여러 관점에 따라 다양하게 존재하는데, DEVS(Descrete EVent system Specification) 모델은 연속적인 시간상에서 이산적으로 발생하는 사건에 따라 시스템의 상태를 분석할 수 있고 모델링 및 시뮬레이션 방법론의 형식화를 위한 견고한 이론적 기반을 제공하고 있다. 또한, DEVS 모델은 모듈적, 계층적 특성을 제공하고 집합론에 근거한 수학적 형식구조를 제공하여 실 시스템에 대한 체계적인 분석과정을 수행하게 되어 보다 현실적인 모델링을 가능하게 한다. 그러나 타당하지 못한 DEVS 모델이 구축되면 시뮬레이션을 통한 분석결과의 신뢰성이 떨어져 아무런 효과가 없고 경제적인 손실만이 따른다. DEVS 모델에 대한 기존의 타당성 검사가 많은 시간과 노력이 요구되고, 반복적인 DEVS 모델링 과정으로 인한 전문적이고 경험적인 지식을 요구한다. 또한, 모델설계자에 의해 설정된 실험 프레임하에서 DEVS 모델의 구성요소에 속하는 상태전이함수, 시간진행함수 및 출력함수에 대하여 commutative 성질의 보전성 검사가 어렵다는 문제점을 가지고 있다. 본 연구에서는 이와 같은 문제점을 해결하기 위하여, DEVS 모델에 대한 타당성 검사를 SPN(Stochastic Petri Net) 모델로 변환하여 SPN 모델을 이용하는 간단하고 효과적인 타당성 검사 방법을 제안한다. 먼저, DEVs 모델에 대한 개념과 기존의 DEVS 모델에 대한 타당성 검사 방법을 고찰하고 그 문제점에 대하여 자세히 설명한다. DEVS 모델의 타당성 검사에 이용하는 SPN 모델에 대한 개념과 DEVS 모델과 행위적으로 동등한 SNP 모델로 변환을 위한 관점을 제조명하다. 동일한 관점에서 두 모델의 상태표현이 같도록 DEVS 모델이 SPN 모델로 표현됨을 보이는 변환이론을 제시하고 변환이론을 바탕으로 모델 변환과정을 제시한다. 모델 변환이론과 변환고정을 기본으로 타당성 검사를 위한 새로운 동질함수(homogeneous function)를 정의하고 이와 함께 SPN 모델의 특성을 이용하여 DEVS 모델에 대한 타당성 검사 방법을 새롭게 제안한다.

• Journal of the Korea Society of Computer and Information
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• v.18 no.12
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• pp.207-215
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• 2013

The general opinion about the notion of cyberbullying hasn't existed yet, but in related laws it is defined as the entire behavior causing the counterpart to suffer the pain by continuously and repeatedly psychologic offending toward specific students with information and telecommunication products such as the Internet and mobile phones, and spreading the private information or false facts related with specific students. Recently a number of accidents related with abuse of cyberbullying are being broadcast on a variety of mass media, and the argument about the severity and countermeasures against cyberbullying is moving onward. This study has a purpose as suggesting the practical alternatives to prevent cyberbullying victim of middle school students by arguing cyberbullying of middle school students and analyzing the relationship between the general features such as victimized experience and frequency and the emotional behaviors according to victimized experience. As the result of this study, cyberbullying victimized experience has a significant effect on the emotional behavior such as depression, aggression, and academic stress. As political implication, this study suggests the practical alternatives to prevent cyberbullying of middle school students based on the analysis result.

• Cross-Cultural Studies
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• v.51
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• pp.1-24
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• 2018

The real purpose of the Iraq War was to ensure that the United States took control of Iraq's oil and retained its hegemony in the Middle East. Afterward, anti-American and anti-war movements spread around the world. The Iraq war is an important event. Korean poetry goes beyond the specificity of 'Korean War and division' and puts 'anti-war' and 'peace' at the universal level on the subject. It means joining the global and contemporary issues of 'anti-war' and 'peace'. Korean poetry based on the Iraq War is divided into three categories: poetry that accuses and testifies to the devastation, poetry that identifies the cause of the war, and poetry that presents alternatives and solutions. The poetry is linked to the idea of respect for life, and appears in the form of peace and nonviolence.

• The Korean Journal of Archival Studies
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• no.62
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• pp.41-75
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• 2019

Although we expect the Records Freezing system to be introduced through the revision of the Public Records Management Act, the system alone has limitations in preventing illegal disposal of records. If some records have already been destroyed illegally, the agency should identify the reason and prepare corrective action and improvement measures to prevent the repetition of such a wrongful disposal. The purpose of this study is to analyze the NARA's inspection program for unauthorized disposal based on the "Records Management Oversight and Reporting Program" and to find implications for improving the control system of public records disposal. NARA's program is particularly effective in the prevention and post-processing of unauthorized disposal. In this study, firstly, the federal records management oversight and reporting program in the United States was investigated in the legal system. Secondly, the status of NARA's control of unauthorized disposal cases was reviewed and a case of SEC's MUI records was analyzed for showing the systematic procedure of NARA's inspection. Finally, we have summed up the implications of this program for improving NAK's control system of illegal disposal of public records.

• Korean Journal of Psychosomatic Medicine
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• v.28 no.2
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• pp.155-160
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• 2020

Objectives : This study investigate to identify the stability of temperament and personality characteristics of patients including Posttraumatic Stress Disorder (PTSD) patients. Methods : The number of subjects was 102, of which 33 were PTSD patients and 69 were non-PTSD patients. To demonstrate the change in individual temperament and personality characteristics, Temperament and Character Inventory (TCI) were administered repeatedly on the subjects. Repeated measures ANOVA and simple main effects analysis were conducted. Results : When analysed by dividing the subjects into PTSD groups and non-PTSD groups, the differences between the primary and secondary tests did not appear in the non-PTSD groups, but the differences between the primary and secondary tests were significant in Harm Avoidance (HA), Reward Dependence (RD), Self-Directedness (SD), Cooperativeness (C). In addition, it was noted that the time and group interaction effects of HA, RD, SD and C were significant, and that the main effects of time of HA, RD, SD and C were significant. Conclusions : This study is meaningful in that in the course of experience and recovery of traumatic events, we have clinically confirmed that changes in the temperament, known as stable variables, are possible.

• The Journal of the Korea Contents Association
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• v.22 no.4
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• pp.182-189
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• 2022

As OTT services become popular worldwide, content IP expansion strategy has an important position in the platform media industry ecosystem where new content is constantly distributed. In particular, the method in which a successful narrative expands the elements constituting a specific world, that is, the Universe, is effective in reducing risk factors in content IP expansion and expanding content franchises. This study intends to examine how Marvel's cinematic Universe (MCU) is strategically performing content IP expansion while borrowing the multiverse concept and replicating and reproducing it by itself through narrative analysis of . As a result, the multiverse can reproduce an incomplete state by repeating the completed event, which can exist as another self-fulfilling content. At the same time, it can be an effective content IP expansion strategy in that each story can be produced because a single character can exist in multiple under the multiverse.

• The Journal of the Korea Contents Association
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• v.22 no.6
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• pp.273-282
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• 2022

The narrative of the film, Sweet Smell of Success has a multi-layered structure. In Clifford Odets's scenario work, numerous lines for the main plot and subplots repeated a cycle of creation, decomposition, deletion, and modification to enhance the density of the story. As a result, whenever an actor spoke a line or paused, an action or an event that would trigger another line was created, giving depth and persuasiveness to the character's performance. The music of Sweet Smell of Success has multi-layered elements. The non-diegetic music was covered by the orchestral pieces performed by Elmer Bernstein's big band orchestra and the jazz pieces performed by Fred Katz's combo band. The diegetic music was mostly covered by the jazz pieces performed by the Chico Hamilton Quintet. The practical task of the film music was to reinforce or supplement the effect of the narrative driver, and the additional task was to realize the estrangement effect and the aesthetics of stagnation. The possibility and significance of intertextuality of subplots and double sound of this film are not simply confined to the limits of the film noir genre.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.416-416
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• 2020

우리나라의 계절 특성상 여름철 집중호우가 쏟아지는 현상이 빈번하게 발생하는데 이러한 돌발홍수가 예고 없이 일어나 상습적으로 침수 피해를 입는 지역이 증가하고 있다. 본 연구에서 2009년 ~ 2019년 동안 서울시 침수 피해 사건 중심의 인터넷 기사를 기반으로 실제 침수 사례를 조사해본 결과, 침수가 가장 많이 발생한 순으로 반포동(26건), 대치동(25건), 잠실동(21건)으로 집계되었다. 침수피해가 가장 많은 반포동을 연구지역으로 선정하고 그 중 잠수교의 수위를 예측하는 연구를 진행하였다. 기존 연구에서는 수치모형에 비해 신속한 결과를 도출할 수 있는 자료 기반 모형 중 LSTM 기법을 많이 사용하였다. 그러나 이는 선행 시간이 길어질수록 첨두수위에서 과소추정된 것으로 분석된 취약점이 존재하였다(정성호 외, 2018). 본 연구에서는 이러한 단점을 보완하기 위해 GANs(Generative Adversarial Networks)를 이용하였다. GANs는 생성자와 감별자가 나뉘어 생성자가 실제 자료인 첨두수위에서의 잠수교의 수위를 학습하고 실제와 근접한 가상데이터를 결과로 생성하여 감별자는 그 생성된 미래의 잠수교의 수위가 실제인지 가상인지 판별하도록 학습시키는 신경망 구조이다. 사용한 수문자료는 한강홍수통제소, 기상청, 국립해양조사원에서 제공하는 최근 15년간의 (2005년~2019년) 수위, 방류량, 강수량, 조위 자료를 수집하였고 t-test와 상관성분석을 통해 사용한 인자 간의 유의미성 판단과 상관성을 분석했다. 또한, 민감도 분석 결과 시퀀스길이(5), 반복횟수(1000), 은닉층(10), 학습률(0.005)로 최적값을 선정하였다. 또한 학습구간(2005년~2014년)과 검증구간(2015~2019년)으로 나누어 상대적으로 높은 수위가 관측되는 홍수기의 3, 6, 9시간 후의 수위를 예측하고 오차 지표를 이용해 평가하였다. LSTM 기법으로 예측된 수위와 GANs로 예측된 수위를 비교한 결과 GANs으로 예측된 첨두수위에서의 정확도가 5% 정도로 향상되었다. 향후에는 다양한 영향인자와 다른 기법과의 결합을 고려한다면 보다 정확하게 수위를 예측하여 하천 주변 사회기반시설의 침수 피해를 감소시킬 것으로 판단된다.