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WRC-2000 회의의 71 GHz 이상 대역의 주파수 재분배 최종 결과
정현수,이황재,정희창,배석희,강상선,정애리,한석태,CHUNG HYUNSOO,RHEE HWANG-JAE,CHUNG HEECHANG,BAE SEOK-HEE,KANG SANG-SUN,CHUNG AEREE,HAN SEOG-TAE 한국천문학회 2000 天文學論叢 Vol.15 No.1
Radio astronomy, on its part, requires 'quiet zones' to be able to receive incoming cosmic signals unaffected by interference to enable astronomers and others learn about universe. The agenda item 1.16 of WRC-2000 contains a number of issues relevant for radio astronomy, but some of them are more important than others. The preparations for WRC-2000 have reached a close-to-final stages, with a number of proposals to this agenda item submitted to the ITU by many countries and groups of countries, like APT, CEPT and CITEL. There is no clear preference to anyone of these proposals since their differences are only minor. However, several points remain to be solved in the APT and CITEL. Fortunately, the preparation went very well, and consensus was reached on allocations above 71 GHz and three resolutions. The radio astronomy has obtained about 100 GHz of new spectrum allocations in bands above 71 GHz. In addition, a new resolution was approved by plenary meeting of WRC-2000. It deals with the consideration by a future WRC of sharing and compatibility issues between passive and active services in adjacent bands particularly with the space services (downlinks) into radio astronomy above 71 GHz. Therefore, in future, there should be a need for studies to be made to determine if and under what conditions sharing is possible, given that modifications were made on the basis of requirements known now and that little was known of requirements and implementation plans for active services in bands above 71 GHz.
정현수,정희창,이황재,배석희,강상선,정애리,한석태,CHUNG HYUNSOO,CHUNG HEECHANG,RHEE HWANG-JAE,BAE SEOK-HEE,KANG SANG-SUN,CHUNG AEREE,HAN SEOG-TAE 한국천문학회 2000 天文學論叢 Vol.15 No.1
We have analyzed the frequency sharing in the range of 71-275 GHz, which was adopted as a main topic of the WARC-2000 at the previous conference WARC-97. Though the technology of the active services has not been fully developed in this frequncy range, the heavy usage of this technology is expected in foreseeable future. To protect the passive services from spurious and out-of-band emissions of active services, realignment of the spectrum between 71 GHz and 275 GHz is strongly required. In addition, some effort should be made to allocate special bands for the radio astronomy service.
Effect of the LED Illumination and PMV Index on the Performance of Cognitive Tasks
( Hyungsun Kim ),( Jinho Kim ),( Heechang Jung ),( Ilkyung Chung ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
This study examined to find out the optimum LED illuminance in accordance with the cognitive task in an office area. To achieve this, we used LED illumination that could be adjusted from 400lx to 1000lx and set color temperature to 5200K which was similar to the temperature of common fluorescent lamp. And, we designed the cognitive tasks, which were divided by number error-correction, letter error-correction, and numerical calculation. The cognitive task time, error, and questionnaire about preference of LED illumination and PMV value were measured. As a result, the required time of error correction work was highest in 600lx, accuracy was highest in 1000lx. In addition, the PMV index should be set to 0 for a higher level of work efficiency. Thus, we showed it was necessary to determine the appropriate PMV value and the LED illumination for the improvement of visual performance at near.
ICT Convergence Standard Technology Analysis for Ubiquitous Plant Farming Based on Network
DongIl Kim,SoongHee Lee,HeeChang Chung,ChangKyu Kim 한국정보통신학회 2014 2016 INTERNATIONAL CONFERENCE Vol.6 No.1
ICT convergence with agriculture is expected to bring more efficiency and quality improvement in producing, distributing, consuming of agricultural products with the aid of information processing and autonomous control technologies of the IT area. Ubiquitous Plant Farming based on network is a service which is capable of coping with environmental and technical problems with the actualized IT convergence case for agriculture. This paper presents standard technology analysis on the standardization status including the reference model, service requirements and network capabilities prepared for this purpose.
Effect of the LED Illumination and PMV Index on the Performance of Cognitive Tasks
Hyungsun Kim,Jinho Kim,Heechang Jung,Ilkyung Chung 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5
This study examined to find out the optimum LED illuminance in accordance with the cognitive task in an office area. To achieve this, we used LED illumination that could be adjusted from 400lx to 1000lx and set color temperature to 5200K which was similar to the temperature of common fluorescent lamp. And, we designed the cognitive tasks, which were divided by number error-correction, letter error-correction, and numerical calculation. The cognitive task time, error, and questionnaire about preference of LED illumination and PMV value were measured. As a result, the required time of error correction work was highest in 600lx, accuracy was highest in 1000lx. In addition, the PMV index should be set to 0 for a higher level of work efficiency. Thus, we showed it was necessary to determine the appropriate PMV value and the LED illumination for the improvement of visual performance at near.