• 스마트미디어저널
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• 제6권2호
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• pp.33-41
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• 2017

철도 선로전환기는 열차의 진로를 현재의 궤도에서 다른 궤도로 제어하는 장치이다. 선로전환기의 노후화로 인한 이상 상황은 탈선 등과 같은 심각한 문제를 발생할 수 있기 때문에, 선로전환기의 적절한 교체시기를 결정하는 것은 매우 중요하다. 본 논문에서는 국내 철도 현장에서 획득한 선로전환기의 전류신호로부터 다차원 데이터 큐브를 구성하고 OLAP(On-Line Analytical Processing) 분석을 통하여 체계적으로 "교체가 필요한 데이터"와 "교체 시점이 아닌 데이터" 집합을 정제하여 분류하였다. 또한 선로전환기의 교체시기 탐지 문제를 이진 분류 문제로 해석하여 이진 분류기의 대표적 모델인 SVM(Support Vector Machine)을 탐지기로 설계함으로써 선로전환기의 노후화에 따른 적절한 교체시기를 탐지하는 시스템을 제안한다. 이때, 입력되는 전류 신호를 DWT(Discrete Wavelet Transform)와 PCA(Principal Components Analysis) 기법으로 고차원의 특징벡터 신호를 정보의 손실을 최소화하면서 저차원의 특징벡터로 변환한다. 실제 국내에서 운행 중인 선로전환기의 이상상황 정보가 포함된 대규모의 전류 신호를 이용하여 제안하는 시스템의 성능을 실험적으로 검증한 바 98%를 넘는 탐지 정확도를 확인하였다.

• Structural Engineering and Mechanics
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• 제73권5호
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• pp.487-500
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• 2020

Stiffeners can be utilised to enhance the strength of thin-walled wind turbine towers in engineering practise, thus, structural performance of wind turbine towers by means of different stiffening schemes should be compared to explore the optimal structural enhancement method. In this paper two alternative stiffening methods, employing horizontal or vertical stiffeners, for steel tubular wind turbine towers have been studied. In particular, two groups of three wind turbine towers of 50m, 150m and 250m in height, stiffened by horizontal rings and vertical strips respectively, were analysed by using FEM software of ABAQUS. For each height level tower, the mass of the stiffening rings is equal to that of vertical stiffeners each other. The maximum von Mises stresses and horizontal sways of these towers with vertical stiffeners is compared with the corresponding ring-stiffened towers. A linear buckling analysis is conducted to study the buckling modes and critical buckling loads of the three height levels of tower. The buckling modes and eigenvalues of the 50m, 150m and 250m vertically stiffened towers were also compared with those of the horizontally stiffened towers. The numbers and central angles of the vertical stiffeners are considered as design variables to study the effect of vertical stiffeners on the structural performance of wind turbine towers. Following an extensive parametric study, these strengthening techniques were compared with each other and it is obtained that the use of vertical stiffeners is a more efficient approach to enhance the stability and strength of intermediate and high towers than the use of horizontal rings.

• 비교문화연구
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• 제29권
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• pp.315-339
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• 2012

The Chilean educative policies as the Voucher System and the privatization have been almost same from the Pinochet government and the ones of "Concertacion" or "Democratic Alliances" until now. Because the neoliberal regime has dominated principally in Chile the area of the education. In this study first of all I will analyze the procedures of the violent repression of the leftist politicians and the intellectuals of the universities by the Pinochet government. And the importance of the reform of the law of education in 1980 was emphasized and the other one in 1990 one day before the retirement of Pinochet. We can comprehend the fact that the education would have been used as a tool to achieve the development of the country and the economic one sacrificing the public and equalitarian values of the education. And the competence, the efficiency and the quality of the education have been emphasized through the policies as example the rights of the selection of the schools by the parents as like a product in the market. But the result was the enormorors expansion of the private education not only in the secondary schools but also in the universities. And also has been intensified "the segregation and the discrimination" of the students jerarquitized by the different social-economic levels of the parents. The Chilean people including the middle class did not realize rightly the inherent problems of the neoliberal regime having the equivocation as if the private schools should have been better than the public ones. However the high level of the public university education became to be dominated by the acomodated class. This was the cause of the last year's great scale of the demonstration of the Chilean students. The most important thing is that these matters was agravated not by the Pinochet government but by the ones of "Concertacion" or "Democratic Alliances". Because these governments tried to maintain the neoliberal regime by means of the education only arranging the small problems or contratiempos.

• 한국철학논집
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• 제37호
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• pp.71-96
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• 2013

본 연구는 남당 한원진의 철학사상, 특히 심성론을 비판적인 입장에서 논의한 것이다. 주지하다시피, 남당은 인물성(人物性)의 상이함을 강조해서 "인간의 가치와 존엄성을 공고히 하고자 했다"고 평가된다. 그러나 그의 이론체계는 결코 그런 목적을 지지하지 못했다. 우선, 그는 현실세계에 초점을 맞춰 "기선리후(氣先理後)"를 주장했는데, 이는 리의 존재론적 의미가 기에 의해 변질될 수 있다는 뜻으로 결국 리로 하여금 천지만물의 최종근거이자 순선한 도덕법칙이 될 수 없도록 만들어 버린다. 이런 논리가 심성론에도 그대로 적용되어, 결국 천지만물의 실제적인 성은 기질에 의해 변질된 리가 또한 기질과 뒤섞여 형성된 것이며, 현실적이고 구체적인 심은 기품에 의해 이미 그 '우열'이 결정되어 있는 인지능력을 가질 뿐이다. 이런 심성에 근거해서 우리가 어떻게 도덕을 실천할 수 있겠으며, 인간의 가치와 존엄성을 확보할 수 있겠는가?

• 한국철도학회논문집
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• 제19권4호
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• pp.468-479
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• 2016

고압 전선 등에 장착된 시스템에 전원을 공급하기 위해서는 절연 이격 거리 이상의 거리에 무선으로 수십 Watt 급의 전력을 보낼 수 있는 시스템이 필요하다. 이러한 무선 전력 전송 시스템은 대개 코일의 크기가 10cm 이상의 대형이다. 본 연구에서는 이처럼 대형 코일을 Printed circuit board를 이용해 제작할 경우 발생하는 손실 발생원 들을 분석하고 그 중 가장 주요한 손실원인이 Dielectric loss 라는 것을 밝혔다. 또한 이 dielectric loss를 최소화 하기 위해서 PCB의 재질 선정 방법 및 Distributed tuning capacitor method를 제시해 $40cm{\times}40cm$ 크기의 4턴 및 5턴 코일의 설계 방법을 제시했고, 실험을 통해 Quality factor를 300 이상으로 만들 수 있음을 보였다.

• 한국컴퓨터정보학회논문지
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• 제23권1호
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• pp.103-109
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• 2018

The purpose of the study is to investigate the effect of a simulation training of BLS in paramedics in pre-hospital situation. This a nonequivalence control quasi-experimental study. The study subjects were 8 paramedics of experimental group and 8 paramedics of control group in K fire department. An informed consent was written by the subjects after explaining of the purpose of the study. The study methods consisted of conventional education and practice training. The conventional education was done for 30 minutes and the practice training was taken by four trainees of one group and the instructor demonstrated Basic Iife Support (BLS) performance for three minutes. Each trainer peformed BLS for ten minutes. In the beginning of the course, two paramedics got off from the ambulance and performed BLS including 5 cycles of Cardiopulmonary Resuscitation (CPR). Soon after the BLS, another two paramedics performed pre-hospital BLS survey. The education was guided by two professors of emergency medical technology, two Basic Iife Support instructors, and two emergency rescue directors. Pre-hospital BLS was measured by a 5-point Likert scale. Higher score means higher performance skills. The data were analyzed using SPSS/WIN 22.0 program set at significance level of p<05. The effect of simulation education was much more significant than the conventional education in BLS. The simulation education is very important and effective in improving the clinical performance skills of paramedics than the conventional education. The simulation education can provide the virtual environment of cardiac arrest to the paramedics. In conclusion, the simulation education can provide the effective teaching methods for various practice performance skills and solution by critical thinking in the paramedics and healthcare providers in the future.

• 한국융합학회논문지
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• 제12권9호
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• pp.261-271
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• 2021

학교 폭력, 왕따 등 학교 안전과 관련된 사건 및 사고는 학교 안전이 지역사회 보건 및 복지에 심각한 위협에 노출되어 있음을 시사한다. 학교 안전사고들은 오랜 기간 동안 다양한 정책과 프로그램이 시행되어 왔기 때문에 큰 문제점으로 대두되고 있다. 따라서 지역사회와 정부가 예방책을 마련하는 것이 중요하다. 본 연구는 독일, 영국, 캐나다, 미국, 프랑스 등 다양한 국가에서 시행되는 학교 폭력을 비롯한 학교안전에 관한 교육, 정책, 프로젝트, 프로그램의 성공적인 사례연구를 논의하며 이 논의를 통해 국내적 함의 및 시사점을 제시하였다. 우리나라 학교안전의 질적 보완을 도모할 수 있는 가장 현실적이고 구체적인 방안으로는 지역사회 공동체가 적극적으로 참여하는 것이다. 또한 국제적 프로그램 성공의 가장 효과적인 조정전략은, 학교 밖과의 강력한 연계를 가진 학교안전 프로그램 이었다는 점이다. 즉 지역사회 공동노력으로 건강하고 안전한 학교를 만드는 지역사회 건강증진과 학교안전의 융합적인 접근이었다.

• 농업과학연구
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• 제45권4호
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• pp.749-760
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• 2018

In Korea, the largest agricultural lands are paddy fields which have poor infiltration and drainage properties. Recently, the Korean government has pursued cultivating upland crops in paddy fields to reduce overproduced rice in Korea. For this policy to succeed, it is critical to understand the topographic information of paddy fields and its effects on upland crops cultivated in the soils of paddy fields. The objective of this study was to characterize the growth properties of sesame and perilla from paddy fields with three soil topographic features and soil water effects which were induced by the topographic features of the sesame and perilla. The crops were planted in paddy fields located in Miryang, Gyeongnam with different topographies: mountain foot slope, local valley and alluvial plain. Soil water contents and groundwater levels were measured every hour during the growing season. The paddy field of the mountain foot slope was significantly effective in alleviating wet injury for the sesame and perilla in the paddy fields. The paddy field of the mountain foot slope had a decreased average soil water content and groundwater level during cultivation. Stress day index (SDI) from the alluvial plain paddy field had the greatest values from both crops and the smallest from the ones from the paddy field of the mountain foot slope. This result means that sesame and perilla had the smallest stress from the soil water content of the paddy field on the mountain foot slope and the greatest stress from the soil water content of the alluvial plain. It is important to consider the topography of paddy fields to reduce wet injury and to increase crop yields.

• 패션비즈니스
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• 제23권3호
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• pp.85-100
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• 2019

This study examines changes in consumer perceptions of fashion shows, which are critical elements in the apparel industry and a means to represent a brand's image and originality. For this purpose, big data in clothing marketing, text mining, semantic network analysis techniques were applied. This study aims to verify the effectiveness and significance of fashion shows in an effort to give directions for their future utilization. The study was conducted in two major stages. First, data collection with the key word, "fashion shows," was conducted across websites, including Naver and Daum between 2015 and 2018. The data collection period was divided into the first- and second-half periods. Next, Textom 3.0 was utilized for data refinement, text mining, and word clouding. The Ucinet 6.0 and NetDraw, were used for semantic network analysis, degree centrality, CONCOR analysis and also visualization. The level of interest in "models" was found to be the highest among the perception factors related to fashion shows in both periods. In the first-half period, the consumer interests focused on detailed visual stimulants such as model and clothing while in the second-half period, perceptions changed as the value of designers and brands were increasingly recognized over time. The findings of this study can be utilized as a tool to evaluate fashion shows, the apparel industry sectors, and the marketing methods. Additionally, it can also be used as a theoretical framework for big data analysis and as a basis of strategies and research in industrial developments.

• 한국측량학회지
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• 제36권6호
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• pp.499-505
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• 2018

지금까지 만들어지고 있는 실내공간데이터는 공간적 활용을 위한 데이터라고 하기 보다는 삼각분할로 표현된 3DS나 COLLADA 형식의 가시화 데이터이다. 의미 있는 공간분석이나 실내응용서비스를 개발하기 위하여서는 단순히 삼각분할로 만들어진 가시화데이터가 아니라 의미적 공간정보가 필요하다. OGC (Open Geospatial Consortium) 표준인 IndoorGML(Indoor Geographic Markup Language)은 가시화가 아니라 실내공간 분석을 비롯한 다양한 응용을 위하여 만들어진 공간데이터 형식이다. 따라서 삼각분할로 표현된 3DS나 COLLADA형식의 실내 공간데이터를 OGC IndoorGML 형식으로 변환하는 것은 중요한 작업이 된다. 본 논문에서는 이 문제를 해결하기 위하여, 삼각분할 형식으로 표현된 원시 실내 공간데이터를 기하, 위상, 그리고 의미적으로 유용한 IndoorGML로 변환하는 방법을 제시한다. 또한 이 변환 방법의 타당성을 위하여 개발된 도구도 함께 소개한다. 실제 데이터를 통한 실험을 통하여 이 방법과 개발된 도구를 검증하였다.