• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2002년도 정기총회 및 학술대회
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• pp.85-90
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• 2002

Traffic specification plays a crucial role in the resource reservation for video services over the packet-switching networks. The current development of QoS-guaranteed service still leaves a wide space for the selection of traffic specification. We propose a new method to estimate the traffic specification of variable-bit-rate (VBR) video for deterministic service. The method is based on the concept of empirical envelope and the delay bound. The solution shows to be simple yet it provides excellent network utilization.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.483-495
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• 2011

In modern society, the range of time and space in life is continually expanding due to increase of income and diversification of life. In order to respond to these changes and to satisfy needs and to secure the mobility of citizens, the construction of transport infrastructure and public transport services should be provided continually. In particular, to ensure mobility during late-night hours, providing metropolitan public transport services is urgently needed. Due to expansion of life zone, tension of time and space of metropolitan transportation is essential to construct transport infrastructure in preparation for entry into 24-hour community. This study was based on analysis of travel resource and survey data conducted by passengers of express trains, conventional trains, and metropolitan bus. This study is to investigate use characteristics of passengers and characteristics and problems of Gyeongin-line. Moreover, this study's purpose is to suggest plans in order to improve express train operation and extend hours of the midnight express. It is also important to vitalize public transportation.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2004년도 한국우주과학회보 제13권2호
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• pp.351-355
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• 2004

A multibeam switching satellite system technology have started localized development to overcome the limitation of the frequency resource and geostationary orbit existing relay type satellite transponder and the required performance of the spot beam, and looked around the configuration and functions of the multibeam switching satellite communication system. This paper proposed that operation scheme and network control features for service definition, network architecture, transmission method of the natural disaster service network and public communication service network using this system.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권12호
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• pp.3237-3256
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• 2012

In the context of effective usage of a scarce spectrum resource, emerging wireless communication standards will demand spectrum sharing with existing systems as well as multiple access with higher spectral efficiency. We mathematically analyze the sum throughput of a spectrum sharing space-division multiple access (SDMA) system, which forms a transmit null in the direction of other coexisting systems while satisfying orthogonal beamforming constraints. For a large number of users N, the SDMA throughput scales as log N at high signal-to-noise ratio (SNR) ((J-1) loglog N at normal SNR), where J is the number of transmit antennas. This indicates that multiplexing gain of the spectrum sharing SDMA is $\frac{J-1}{J}$ times less than that of the non-spectrum sharing SDMA only using orthogonal beamforming, whereas no loss in multiuser diversity gain. Although the spectrum sharing SDMA always has lower throughput compared to the non-spectrum sharing SDMA in the non-coexistence scenario, it offers an intriguing opportunity to reuse spectrum already allocated to other coexisting systems.

• 디지털융복합연구
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• 제16권2호
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• pp.287-292
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• 2018

본 연구는 국내 외 활발히 비콘 기술을 개발 중인 기업의 기술 동향을 분석하고 문화예술 공간의 비콘 서비스 적용 사례조사를 통해 국내 문화예술 공간에서 비콘 서비스가 나아가야 할 방향성을 제안하는 데 그 목적이 있다. 연구방법으로는 문헌연구를 통해 비콘 서비스의 이론적 배경을 고찰하였으며, 국내 외 문화공간들의 비콘 서비스 적용 사례조사를 진행하였다. 그 결과, 국내 비콘 기술은 공간이 넓은 곳에서도 충분히 다양한 서비스를 제공할 수 있다는 것을 알 수 있었다. 또한, 혜택 제공중심 서비스를 제공하는 국내와는 달리 국외는 경험제공중심 서비스를 제공한다는 특징을 통해 국내 전시공간의 비콘 서비스가 혜택 제공중심을 넘어 경험제공중심의 서비스로 이루어져야 한다는 것을 알 수 있었다. 본 연구를 바탕으로 앞으로 한국의 문화예술 공간에서 비콘 서비스를 통해 다양한 커뮤니케이션 서비스 활성화 방안을 위한 참고 자료로 사용될 수 있을 것을 기대한다.

• 천문학논총
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• 제36권2호
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• pp.37-45
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• 2021

We have analyzed 42 research papers regarding on the solar astronomy written by North Korea scientists to investigate the current status of astronomical activities in North Korea. The papers are surveyed from the 'Bulletin of Astronomy', the 'Physics', the 'Bulletin of Academy of Science', and the 'Natural Science' in North Korea, and SCI journals. In addition, we refer to the presentation material announced in the 2015 IAU by director of Pyongyang Astronomical Observatory (PAO) and the 2013 OAD/IAU reports. We have analyzed the papers statistically according to three criteria such as research subject, research field, and research members. The main research subjects are the sunspot (28%), observation system (21%), and space environments (19%). The research fields are distributed with data analysis (50%), numerical method (29%), and instrument development (21%). There have been 25 and 9 researchers in the solar astronomy and space environment, respectively since 1995. North Korea's solar research activities were also investigated in three area: instrument, solar physics, and international research linkage. PAO has operated two of sunspot telescope and solar horizontal telescope for spectroscopy and polarimetry, but there is no specific information on solar radio telescopes. North Korea has cooperated in solar research with Europe and China. We expect that the results of this study will be used as useful resource in supporting astronomical cooperation between South and North Korea in the future.

• 한국실내디자인학회논문집
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• 제21권4호
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• pp.106-113
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• 2012

As environmental pollution and resource exhaustion have been considered as social issues, interest in green content industries which lead low-carbon green growth is increasing. In various areas, green content products and programs have been presented. Of them, kid theme parks are designed to recognize fun and advantages eco-friendly consumption with green contents has and lead children to recognize the problems of environmental pollution and the importance of environment. This study aims to analyse kid theme parks using green contents and characteristics of their space representation. The analysis frame was made through theoretical examination for bibliographical data and a direct interview in terms of factors of green contents. For the analysis frame, visitors were directly interviewed from June to July, 2012. Cases of introduction were analysed to identify realization and characteristics of green contents. As a result of the analysis, it was discovered that kid theme parks using green contents pursued green stories, but they did not consider environment seriously in terms of content materials and methods of realization. To develop successful kid theme parks using green contents, multi-dimensional research is needed in various aspects and various contents such as media should be introduced. The parks should provide fun space for children and propagate green ideas. Its success can lead in green entertainment. The study will be helpful for design of future kid theme parks.

• 한국실내디자인학회논문집
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• 제15권6호
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• pp.150-158
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• 2006

The purpose of this study is to evaluate environment-friendly planning feature in Environment-friendly Certificated apartments and to use the basic planning data of housing. Seven Environment-friendly Certificated apartments have been analyzed. The findings of this study are as follows: Environment-friendly planning features are categorized into 4 items; floor planning feature, material planning feature, universal planning feature and environmental planning feature. Among floor planning features, natural sunlight, built-in closets, and differentiated floor plans are well considered, but the flexible floor plan for resident's lifestyle and green space are lack. Among material planning features, environment-friendly finishing materials, environment-friendly products and energy-efficient double-pane windows are well considered, but implementation for resource savings using recycled materials are lack. Among universal design planning features, removal of threshold and installation of safety device in bathroom are not well considered. Among environmental planning features, usage of alternative energy like solar energy are not applied. The environment-friendly planning features in interior space should be introduced in diverse ways.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2009년도 공동학술대회
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• pp.498-501
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• 2009

국민의 여가시간 증대로 친수시설에 대한 해양관광 수요의 증가가 예상되며, 이에 주요 항만이나 지역의 어촌, 경승지 및 명소에 어울리는 조형미를 갖춘 등대시설을 관광자원화하여 이러한 수요를 충족시킬 필요가 있다. 또한 우리나라에 등대가 들어선지 어언 100여년이 지나면서 훼손된 등대를 새롭게 신축하고 있는 시점에서 우리나라 등대건축을 진단하고 그것들의 보존과 적극적인 해양관광자원으로서의 활용방안 연구가 필요하다. 이제 등대는 전통적인 기능과 역할에 충실한 항로표지일 뿐만 아니라 온 국민이 향유하고 체험하는 새로운 관광시설이자 공간으로 적극 개발되어야 할 것이다. 이러한 맥락에서 본 연구는 국내 등대 개발사례를 검토하여 등대의 해양관광자원으로서의 개발을 위한 방안을 제시하였다.

• 한국실내디자인학회논문집
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• 제14권4호
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• pp.54-61
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• 2005

The purpose of this study is to examine the physical factors of work environment and to establish the evaluation factors for office design for wheelchair users. This study is based on the existing research for office environmental factors; and then clarifies the physical factors that are suitable for circumstances of wheelchair users. These factors are composed three physical factors which are space, furniture arrangement, and ambient condition and then each of these factors has detailed several elements. Futhermore, comparing physical factors between a non-wheelchair user and a wheelchair user with work environment is analyzed on the assumption using the system furniture on the market. This study is expected to be used as basic information to provide the way of improving office space plan for wheelchair user in workplace. This resource can serve as a checklist when renovating, re-designing or building a new office space for wheelchair users. The evaluation of office environmental factors for wheelchair users who work in public and/or private companies is needed for the next research.