http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
권기홍(Gi-Hong Kwon),이경규(Kyung-Kyoo Lee) 한국환경관리학회 2007 環境管理學會誌 Vol.13 No.4
현재까지 대부분 폐기되고 있는 폐음료용 용기의 캡에서 유가금속인 알루미늄을 분리회수하기 위한 연구결과 다음과 같은 결론을 얻었다. 유가금속의 회수를 위한 캡 내 liner의 제거방법으로는 열적처리방법은 파쇄ㆍ절단에 의한 방법보다 작업성이 간편하고 금속의 회수율이 우수한 것으로 사료되며 최적운전조건은 약 500℃에서 10분에서 열적처리하고 이때 발생하는 미연분을 모아 제거할 수 있는 연소실 및 대기오염 방지시설을 설치하여 적정처리를 통하여 대기오염을 감소시킬 수 있는 방법을 강구하는 것이 효과적 일 것으로 사료된다. The purpose of this study is to find some methods needed to separately collect a valuable aluminum cap from used metal drink bottles. Some methods for removing a liner within the cap were found to collect aluminum as a valuable material from used metal drink bottles. It was shown that a heat-treating method among them was easier to work and better to collect the metal than a crushing and cutting method did. The optimal condition for operation was at the temperature of 500℃ and for the duration of 10 minutes. To do the work effectively, then, it is required to take proper actions for preventing air from being polluted by being equipped with combustion and air pollution preventing facilities.
열적처리를 통한 건축폐기물 중 폐알루미늄(Al)의 회수
권기홍(Gi-Hong Kwon),이경규(Kyung-Kyoo Lee) 한국환경관리학회 2008 環境管理學會誌 Vol.14 No.4
혼합건축폐기물 중 재활용이 시급히 요구되고 있는 폐금속류인 알루미늄의 분리회수를 위한 연구결과 다음과 같은 결론을 얻었다. 현재까지 재활용되지 못하고 폐기되고 있는 건축폐기물 중 폐알루미늄의 구성성분은 유리 (40.0%), 실리콘(37.1%), 알루미늄(22.9%)으로 확인되었다 이들 구성성분 중 알루미늄을 분리할 수 있는 방법으로 열적처리가 효율적일 것으로 판단되었으며, 실험실적인 조건에서 전기로를 이용하여 실험한 결과 열적처리에 의한 온도범위는 500~550℃, 적정분리시간은 30분 정도 소요되는 것을 확인하였다. 이때 알루미늄 회수율은 90%이상을 분리회수할 수 있었다. 분리회수한 알루미늄의 화학적 성분을 분석한 결과, 순도는 약 99%로 시중에서 판매되는 알루미늄의 순도 범위안에 속하여 재활용이 충분히 가능함을 알 수 있었다. This study was performed to examine the separate collection of waste aluminum that are required urgently for a recycling among a board variety of building wastes. The results of this study are summarized as follows. It is reported that among a wide range of building wastes that have not been recycled so far, waste aluminum consist of glass (40.0%), silicon (37.1%) and aluminum (22.9%). The thermal treatment method was considered to be effectively used for separating aluminum from these components. When an experiment was carried out using an electric furnace under testing conditions, therefore, the results showed that the temperature range of the thermal treatment was 500-550℃ and the proper separating time was approximately 30 minutes. It was shown, then, that the separation rate of the aluminum component was 90% or more and the degree of its purity was approximately 99% which is equivalent to that of aluminum on the market. As a result, it was found that those waste aluminum could be available for recycling.
이경규,김산해,김홍철,이원철,신요안 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-
MIMO (multi-input multi-output) systems can achieve high data capacity and high data rate in the third generation (3G) or beyond-3G mobile communication systems. To effectively improve the performance of MIMO systems, new detection schemes which can mitigate mutual interferences from multiple transmit antennas, are highly required. In this paper, we consider a posteriori probability (APP) type detection schemes for the MIMO systems, and compare with other sub-optimal detection schemes based on zero forcing (ZF) and minimum mean square error (MMSE) - ordered successive interference cancellation (OSIC). Simulation results show that the APP outperforms ZF-OSIC and MMSE-OSIC, while the performance discrepancy becomes smaller as the number of receive antennas increases.
Maximum Ratio Transmission 기법의 MIMO 다중경로 페이딩 채널로의 확장
이경규,이원철,신요안 崇實大學校 生産技術硏究所 2001 論文集 Vol.31 No.-
To effectively improve capacity on fading channels in the third generation and beyond mobile communication systems that require high quality and capacity, spatial diversity schemes utilizing MIMO (Multi-Input Multi-Output) concepts have been identified as an efficient way of improving the capacity without expanding the bandwidth. Among various MIMO spatial diversity schemes, MRT (Maximum Ratio Transmission) which maximizes signal-to-noise ratio at the reception has been recently proposed. In this paper, we extend the conventional MRT scheme which is restricted to flat fading channels to MIMO multipath fading channels, and analyze the bit error rate performance.
IMT-2000 위성통신 시스템에서 폐쇄루프 전송 다이버시티 기법의 성능 분석
오관명,김학성,김산해,이경규,이원철,신요안 崇實大學校 2000 論文集 Vol.30 No.1
In this paper, we apply a close loop transmit diversity scheme to IMT-2000 satellite systems, and investigate the performance of the scheme in both ideal and more realistic situations. We verify that the performance of the closed loop transmit diversity scheme is quite sensitive to errors in feedback information. However, we also show that the number of quantization bits for feedback information does not significantly affect the system performance when considering the feedback of phase information only. In addition, 2-bit quantized system achieves the better performance than 4-bit quantized system in terms of slot error rate.