• 아동학회지
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• 제24권6호
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• pp.47-60
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• 2003

This study analyzed the pattern of preschool children's abilities based on Project Spectrum and compared the relationship between intelligence domains with working styles of children. Generally, children showed both strengths and weaknesses in specific Spectrum domains, but some children had only strengths and others had only weaknesses without strengths. It appeared that working style does not relate to children's strong domains, but individual disposition was reflected by characteristics of the task. During both individual and group spectrum activities, children with strengths were more "easily engaged in activity", "confident", and "focused" than those without strong intelligence domains. During individual activities, the "reflective" domain showed children with strengths in intelligence domains are more reflective than those without strengths.

• 한국산학기술학회논문지
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• 제10권7호
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• pp.1685-1695
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• 2009

본 연구는 프로젝트 스펙트럼의 한 영역인 언어영역활동을 실험집단에 적용해 봄으로써 창의성에 어떤 효과가 있는가를 분석하는데 그 목적이 있었다. 이러한 연구 목적을 달성하기 위하여 다음과 같은 연구문제를 설정하였다. 프로젝트 스펙트럼의 언어활동이 유아의 창의성에 어떤 효과가 있는가? 연구대상은 광주광역시에 위치한 W유치원에 재원중인 만 5세반 유아 40명(남아 26명, 여아 14명)을 실험집단으로 M유치원에 재원중인 만 5세반 유아 40명 (남아 22명, 여아 18명)을 통제집단에 임의 배정하였으며, 15주에 걸쳐 실험집단에는 프로젝트 스펙트럼의 언어활동을 통제집단에는 유치원 교육과정의 언어생활영역에 근거한 언어활동을 총20회 실시하였다. 본 연구의 실험을 수행한 결과 프로젝트 스펙트럼의 언어활동을 수행한 실험집단이 통제집단의 유아들보다 창의성에 있어서 효과적이었다.

• 아동학회지
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• 제22권4호
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• pp.33-50
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• 2001

This research analyzed differences between parents and teachers in assessment of young children's potential abilities based on multiple intelligences theory. Subjects were 10 boys and 10 girls, 4 and 5 years of age and their parents and teachers. Children's potential abilities were measured by the Korean Project Spectrum(KPS) and by the assessments of parents and teachers. Data were analyzed by SPSS. Statistical methods were Cronbach's ${\alpha}$, t-test, and Pearson's and Spearman's correlations. Results revealed differences between the assessments of parents and of teachers. While teacher assessments were very similar to the results of the KPS on logical mathematical and linguistic intelligence, the results of parents' assessments were different from the results of the KPS on musical, interpersonal-intrapersonal, and naturalistic intelligence.

• International Journal of Internet, Broadcasting and Communication
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• 제10권1호
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• pp.1-10
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• 2018

In cognitive radio (CR), secondary users (SUs) are able to sense the absence of primary users (PUs) in the spectrum. Then, SUs use this information to opportunistically access the licensed spectrum in the PUs' absence. In this paper, we present an implementation of real-time video transmission with spectrum-sensing between two points using GNU Radio and a National Instruments 2900 Universal Software Radio Peripheral (USRP). In our project, spectrum-sensing is implemented at both transmitter and receiver. The transmitter senses the channel, and if the channel is free, a video signal (which could be a real-time signal from a video file) will be modulated and processed by GNU Radio and transmitted using a USRP. A USRP receiver also senses the channel, but in contrast, if the channel is busy, the signal is demodulated to reproduce the transmitted video signal. This project brings in several challenges, like spectrum-sensing in the devices' environment, and packets getting lost or corrupted over the air.

• 정보화정책
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• 제17권3호
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• pp.57-73
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• 2010

우리나라 정부는 전파이용질서를 유지 보호하고 주파수를 제때 알맞은 곳에 공급할 수 있는 전파감시 사업으로 전파의 효율적 이용을 촉진하고자 한다. 이에 본 연구에서는 우리나라 유비쿼터스 전파감시 사업의 경제적 편익 분석을 통해 유비쿼터스 전파감시 사업의 발전을 위한 전략 및 정책 방향을 도출하고자 한다. 이에 본 연구는 CVM을 활용하여 엄밀한 경제이론에 근거하여 유비쿼터스 전파감시 사업의 편익을 정량적으로 규명하고자 하였다. 분석 결과 유비쿼터스 전파감시 사업을 위한 연간 가구당 평균 WTP가 1,268원으로 나타났다. 이를 7대 대도시 전체 가구로 환산한 유비쿼터스 전파감시 사업의 경제적 편익은 연간 79억원에 이르는 것으로 나타났다. 본 연구의 결과는 향후 유비쿼터스 전파감시 사업 정책 수립 및 투자정책 등에 정량적인 자료로 활용될 수 있다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.339-342
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• 2008

In this paper, the lessons and learns are introduced from the result of the trial project which is the first CBTC(Communication Based Train Control System) at Korail Bundang Line. This project has started end of 2002 and finished recently by Samsung SDS. The main purpose of this project was that new technology was seek for next generation of railway signal control system adapted in Korea. In 2002, there was no any revenue service system using Radio Frequency CBTC in the world at that time. Just a few trial project was on going in USA and EU. In well developed cities, the metro system have been built and old enough therefore they have to be considering re-signalling their existing system with advanced system for increasing availabilities of line usage and safety. This Bundang Line Trial Project was the first Korean CBTC project for above reasons. Most sub systems have been developed using local technology such as Electronics Controlled Interlocking System and Track Circuit Systems etc. Specially, in this project the RF-Communication devices are developed by local technology using DSSS(Direct Sequency Spread Spectrum) instead of FHSS(Frequency Hopping Spread Spectrum). This project has lasted for more than five years originally planned for three years because it was only accessible only night time in the main line from Ori to Suseo about 20km long. Each night only 2 and half hours are available to use the main line. Now the trial project has been done successfully with meet the customer's requirement, therefore the upgrade the mainline of Bundang line and another extension area up to Wangsipli to make revenue service using this new technology. This paper shows this result of the trial project and the strategy of upgrade and extension project as well.

• Nuclear Engineering and Technology
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• 제53권12호
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• pp.4067-4071
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• 2021

The ¹³C (α,n)¹⁶O reaction cross-section is important data for nuclear physics, astrophysical, and neutrino physics experiments, however, they exhibit uncertainties due to the discrepancies in the experimental data. In this study, using the Nedis-2m program code, the energy spectrum of α-induced neutrons in a thin carbon target was calculated and the corresponding reaction cross-section was refined in the alpha particle energy range of 5-8 MeV. The results were used to calculate the intensity and energy spectrum of background neutrons produced in the liquid scintillator of KamLAND. The results will be useful in a variety of astrophysical and neutrino experiments especially those based on LS or Gd-LS detectors.

• 한국CDE학회논문집
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• 제17권4호
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• pp.225-233
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• 2012

A comprehensive research effort in order to develop and disseminate modernized Korean housing (Hanok) has recently been initiated by Korean government. This large scale research project encompasses a wide spectrum of housing development including public policy, architectural plans, modules, construction materials and methods, prefabricated assemblies, automated production, construction management, and advanced information systems. For the purpose of integrating and automating the whole processes from an industry perspective, it is of great importance to develop a standard classification system and project numbering system (PNS) for the modernized Korean housing. This paper focuses on the standard classification systems and PNS for cost and schedule control. The distinct characteristics and managerial requirements were explored and embedded into the proposed classifications for modernized Hanok.

• 한국건설관리학회논문집
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• 제9권4호
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• pp.120-130
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• 2008

건설산업의 핵심성과는 프로젝트가 추구하는 목표, 즉, 비용, 시간, 품질, 안전, 환경 등의 기준을 어느 정도 달성했는지로 평가할수 있다. 그러나, 프로젝트 기반산업이라고 할 수 있는 건설산업의 경우, 성과에 대한 명확한 정의체계가 부재하고, 성과측정에 대한 표준화된 절차와 관리 방식이 구축되어 있지 않아서 프로젝트의 성과를 객관적이고 합리적으로 평가하기가 매우 어려운 것이 현실이다. 본 연구에서는 프로젝트 차원의 성과에 대한 정의 및 기준을 설정하고, 각 성과기준 댈 지표 산출 방식을 개발한 후, 이들 지표를 통해 정량적으로 프로젝트의 성과를 산출할 수 있는 방법론을 제안하고자 한다. 제안된 성과측정 방법론에 입각하여, 실제 사례 프로젝트를 수집하고, 이들을 비교 분석해 봄으로써, 향후 건설 프로젝트에 적용가능 한지에 대한 평가를 실시하였다. 이를 통해 특정한 건설 프로젝트는 상호 비교가능한 지표의 형태로 변환될 수 있으며, 개별프로젝트의 성과를 종합적으로 분석하는 것이 가능해진다. 또한, 건설 프로젝트 관련자로 하여금 성과에 입각한 관리를 가능하도록 유도하여 건설 프로젝트의 효율성을 진작시키는데 큰 역할을 담당할 수 있을 것으로 기대한다.

• 한국군사과학기술학회지
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• 제26권2호
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• pp.113-121
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• 2023

High-precision lasers and anti-aircraft radars are the main equipment to protect the Korean Peninsula, and require preemptive maintenance before signs of failure. Of the key components in the drive sector, bearings do not have a fault alarm function. Therefore, the technology for diagnosing defects in bearings before the performance degradation of equipment occurs is becoming more important. In this paper, for the experimental analysis, we measured the acceleration of the four sets of the same lot using acceleration sensors. Through periodic measurements, the factors that changed until the bearing stopped rotating were analyzed. To determine the replacement time, the main factors and threshold values of the bearing signal were analyzed. The error of the theoretical and experimental analysis results of the defect frequency was within 2.8 %, and the validity of the theoretical analysis results could be confirmed. Based on the results, it is possible to remotely transmit trouble alerts to users through the system check function.