• Design & Manufacturing
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• 제15권3호
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• pp.50-55
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• 2021

Solar power generation, which is one of the methods of using solar energy, has a high possibility of practical implementation compared to other renewable energy power generation, and it has the characteristic that it can generate as much power as needed in necessary places. In addition, maintenance is easy, unmanned operation is possible, and power management can be performed more efficiently if operated in a hybrid method with existing electric energy. Therefore, in this study, numerical analysis using a computer program was performed to analyze the efficient operation and performance improvement of solar energy of the rotating condensing type solar LED street lamp. As a result, the two-axis tracking type could obtain 15.23 % more electricity per year than the fixed type, and additional auxiliary power generation was required for the fixed type by 19 % per year than the tracking type. As a result of computational fluid dynamics(CFD) simulation for PV module surface temperature prediction, the The surface temperature of the Photovoltaics(PV) module incident surface was predicted to be about 10℃ higher than that of the fixed type.

• 예술인문사회 융합 멀티미디어 논문지
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• 제9권4호
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• pp.745-754
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• 2019

GeoWeb 2.0 기술이 활성화됨에 따라 공간정보와 사용자 정보를 매쉬업하는 응용 서비스들이 다양하게 개발되고 있다. 특히 GeoWeb 2.0 기술 기반으로 Google Maps, OpenStreetMap, Daum Map, Naver Map, olleh Map, VWorld 등의 다양한 공간정보 플랫폼들이 매쉬업 서비스를 지원하고 있다. 공간정보 플랫폼의 Open API를 통하여 제공되는 매쉬업 서비스는 2차원 지도, 3차원 지도, 항공영상 등과 같이 다양한 공간정보를 제공하고 있으며 그 응용 분야도 크게 확장되고 있다. 최근 빅데이터 서비스와 더불어 매쉬업되는 사용자 정보가 크게 증가함에 따라 매쉬업 수행에서 성능상의 문제가 발생하게 되었다. 그러나 현재 이러한 매쉬업 성능 개선에 대한 연구는 매우 부족하며, 심지어 다양한 플랫폼들에 대한 매쉬업 성능 비교 연구도 부족한 실정이다. 이에 본 연구에서는 국내에서 접근 가능한 다양한 공간정보 플랫폼들을 기반으로 공간정보와 대용량 사용자 정보의 매쉬업 성능을 비교 분석하고자 한다. 구체적으로 매쉬업 성능 분석을 위하여 매쉬업 시간과 사용자 인터랙션 시간의 두가지 성능 지표를 제안하고 시스템을 구현하여 성능 분석을 수행한다. 끝으로 성능 분석 결과를 통하여 사용자 정보가 크게 증가하고 사용자 인터랙션의 발생 빈도가 높은 경우에 대하여 효율적으로 적용될 수 있는 공간정보 플랫폼을 제시한다.

• ETRI Journal
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• 제28권4호
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• pp.537-540
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• 2006

When multiple ZigBee wireless personal area networks (WPANs) are in close proximity to each other, contentions and collisions in transmissions will lead to increased packet delays. However, there is no existing study on how delay performance would be affected in a crowded real-life environment where each person walking down a busy street would be wearing a ZigBee WPAN. This letter studies the use of ZigBee WPANs in such a real-life environment for real-time heart beat monitoring. To be pragmatic, we derived a mobility pattern from the analysis of a real-life video trace. Then, we estimated the delay performance from the video trace by combining data collected from ZigBee experiments. The results show that the 300 ms packet delay requirement will not be met for only 11% of the time. When failure occurs, it will last for an average duration of 1.4 s.

• 한국주거학회논문집
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• 제23권1호
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• pp.97-105
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• 2012

The purpose of this study is to find the characteristics of design council criteria of metropolitan cities in Koreas. For comparative analysis, four main concepts are used ; 1) self-administering vs discretionary 2) prescriptive vs performance 3) conformity vs contrast 4) point system of criteria. The results of this study were as follows; 1) there were three types of cirteria; strong discretionary (DG), discretionary oriented (BS, US) and combination type (SL, DJ, ICN, GJ) 2) structural properties of forms are controlled by prescriptive criteria, and layout or design elements by performance criteria 3) visual openness and diversity are main items of most metropolitan cities 4) street-faced design was neglected but tended to focus on the self-contained layout 5) visual density indexes were diversified from elevation blockage degree. For further advanced research, it is necessary to investigate the actual effects and differences of regulative types - prescriptive vs performance, and of each design criteria, especially prescriptive ones in improving the design quality.

• 한국유통학회지:유통연구
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• 제10권1호
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• pp.107-122
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• 2005

본 연구는 우리나라 통신서비스 소매점의 성과에 미치는 영향요인을 규명하는데 있다. 선행연구들이 소매점의 선택에 영양을 미치는 요인들을 규범적으로 제시하고, 그 요인들이 어떻게 분류되고, 성과에 미치는 영향을 주로 소비자들의 점포선택과 충성도라는 측면에서 진행되어 왔다면, 소매점의 입지환경을 관찰에 의하여 측정하고, 다시 관찰된 소매점의 성과인 방문고객의 수와 관련하여 연구하였다는 점에서 선행연구와 큰 차이가 있다. 소매점의 성과에 미치는 변수로서는 선행연구 결과와 앞서 언급한 우리나라 통신서비스 소매점의 특성을 고려하여 유동인구, 소매점 시계성, 경쟁점포의 수, 점포의 크기, 가판대 설치, 판촉 행사라는 8개의 변수를 선정하여, 이들 변수들이 소매점의 성과라 할 수 있는 소매점 방문고객의 수에 어떻게 영향을 주는 가를 분석하었다. 소매입지 요인과 점두마케팅 요인 중 어떠한 요인들이 소매점의 성과에 영향을 줄것인가를 분석한 결과, 점두유동인구, 점포 시계성, 점포의 크기는 5%의 유의 수준에서 소매점의 방문고객의 수에 긍정적인 영향을 주는 것으로, 가판대설치, 판촉행사는 19%의 유의수준에서 긍정적인 영향을 주는 것으로 나타났으나, 경쟁점포의 수는 영향을 주지 않는 것으로 확인되었다. 끝으로 이러한 결과의 이론적 및 실무적 시사점이 논의되고, 연구의 한계점과 미래의 연구방향이 제시되었다.

• 한국생산제조학회지
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• 제22권3호
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• pp.429-436
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• 2013

In this study, we researched a pendant-type aspherical optical system, which could be applied to street lighting and security lighting in Europe. The goal of this research was eco-friendly artificial lighting that could be used for the one-to-one replacement of ordinary lighting. LED lighting was miniaturized by using one COB LED Module and one aspherical optical system, which could control the luminosity of the LED. Through the aspherical optical system, the light distribution angle could be controlled in a range of $140^{\circ}$ for the X-axis and $40^{\circ}$ for the Y-axis. This means that this optical system is appropriate for catenary-type lighting, which is widely used in Europe on both narrow and broad roads. The performance was determined using a lighting simulation program. This lighting system simulation showed that road rates M4 and M5 could be satisfied, with the condition of a 13-m height and 50-m distance (U0 and TI). The simulation program estimated that light pollution, which disturbs sleep, could beeliminated in the European streetlight case. Determining methods for the light distribution control, performance, and optimal lighting setup conditions is very important to prevent light pollution. Moreover, the initial step of developing the lighting system design and post management will require an effort with much analysis.

• 제어로봇시스템학회논문지
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• 제5권1호
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• pp.79-87
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• 1999

For its simplicity and cost effectiveness in implementation, the Inverted DGPS is well suited for some specific applications like automatic vehicle location systems, where the monitoring station needs accurate position of the vehicles in the street. In the Inverted DGPS, the user sends its GPS position and associated satellite informations to the reference station, and the corrections are made at the reference station to get differentially corrected user position. A fundamental requirement in IDGPS is that the user and the reference station must use the same satellites when the corrections are made. But in practice, it is not often satisfied. Inverted DGPS is also suffered from performance degradation as the baseline become large like DGPS. IDGPS system using multi-reference station can resolve this problem. In this paper a simple multi-reference IDGPS algorithm is proposed and some experiments and analysis are peformed. Experiment results show that IDGPS can achieve the positioning performance as accurate as the DGPS can provide.

• 한국농촌건축학회논문집
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• 제19권2호
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• pp.17-24
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• 2017

The study aims to investigate problems underlying in an old local house in Iksan, Jeollabuk-do and hence improve performance and remodel the house. Based on a survey regarding current conditions of the house and several case studies on other successful renovation projects, this study suggests new renovation concepts for the old house into a guest house. The study analyzes the current state of Iksan in which the location is faced with population decline - especially among the young - and the lack of community facilities and infrastructure, and finally the unfavorable situation in the residential environment. the case study involves four successful renovated guest house projects: three renovated old single houses in Seoul and Jeonju, and a renovated old Japanese housing complex in Kunsan. The renovating concepts for the local old house is as follows: renovating for performance improvement (i.e. lighting, ventilation, heating, plumbing, insulation, structure, and water proofing), utilizing the local house to a guest house for a growing number of tourists, adding new guest rooms, installing convenient facilities in order to provide better living environments for the visitors, and improving community and street landscapes.

• 국제초고층학회논문집
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• 제5권2호
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• pp.87-94
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• 2016

High-rise as a building typology is gaining popularity in Asian mega-cities, due to its advantages in increasing volumetric density with limited land resources. Numerous factors contribute to the formation of high-rise urban form, from economical and institutional, environmental to socio-political. Environmental concerns over the impact of rapid urbanization in developing economies demand new thought on the link between urban environment and urban form. Outdoor and indoor climate, pedestrian comfort, and building energy consumption are all related to and impacted by urban form and building morphology. There are many studies and practices on designing individual "green" high-rise buildings, but far fewer studies on designing high-rise building clusters from the perspective of environmental performance optimization.. This paper focuses on the environmental perspective, and its correlation with the evolution of the high-rise urban form. Previous studies on urban morphology in terms of environmental and energy performance are reviewed. Studies on "parameterizing" urban morphology to estimate its environmental performance are reviewed, and the possible urban design implications of the study are demonstrated in by the author, by way of a microclimate map of the iconic Shanghai Xiao Lujiazui CBD. The study formulates the best-practice design guidelines for creating walkable and comfortable outdoor space in a high-rise urban setting, including proper sizing of street blocks and building footprint, provision of shading, and facilitating urban ventilation.

• 한국산학기술학회논문지
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• 제17권3호
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• pp.190-196
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• 2016

본 논문은 행사나 전시장 또는 길거리 공연이 가능한 휴머노이드(Humanoid) 로봇 공연 시스템을 제안한다. 본 공연 시스템의 공연 장치들은 모듈 구조로 이동이 쉽고 모듈별 독립 또는 협연이 가능하다. 로봇 공연 시스템은 개선 및 개작이 쉽도록 오픈 소스 기반의 하드웨어 및 소프트웨어로 개발한다. 로봇 공연 시스템에서 로봇, 디스플레이, 오디오, 비디오 및 개별 공연 장치를 제어하는 공연 제어 프로그램은 오픈 소스 언어인 프로세싱(Processing)으로 작성되며 로봇을 이용한 연주 장치와 무대 장치는 오픈 소스 하드웨어인 아두이노(Arduino)를 기반으로 제작된다. 로봇 공연 컨텐츠는 장면별로 이미지, 오디오, 컴퓨터 그래픽 및 비디오 영상 등으로 구성되며 이들을 실행하고 제어하는 로봇 공연 프로그램은 장면별로 로봇 및 공연 장치들과 동기화를 위해 통신한다. 또한 공연에서 주제 표현이 필요한 공연 소품은 3D 모델링 후 3D 프린팅으로 제작한다. 본 로봇 공연 시스템의 컨텐츠는 할로윈 축제를 주제로 구성하며 할로윈 날 전후로 전시장 또는 경연장과 같은 공공장소에서 공연된다.