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박경호,오재현,곽창섭,심원석 연세대학교 산업기술연구소 1980 논문집 Vol.12 No.2
The authors investigated thoroughly the flotation characteristics of stibnite. The flotation behavior of this mineral was carried out by using modified hallimond tube with various xanthates as a collector and modifying agents such as copper sulphate, lead acetate, sodium sulfide, zinc sulphate, sodium cyanide, sodium sulfite and potassium dichromate. The main results obtained in this experiments are summarized as follows; (1) Stibnite shows that it has maximum floatability in pH range 4.0 to 8.0. (2) Stibnite is activated by copper sulphate and lead acetate. (3) Potassium dichromate is an effective depressing agents in stibnite-xanthate system in pH range 4.0 to 6.0. (4) In the pH range in which the zinc sulphate is preciptated by hydroxide, stibnite is depressed effectively (5) Stibnite is depressed by sodium sulfide in alkaline solution.
Horseshoe-shaped antenna for dual-band WLAN communications with multi-L slots
Kwak, Kyung-Sup,Choi, Sun-Ho Wiley Subscription Services, Inc., A Wiley Company 2009 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.51 No.2
<P>In this study, a novel horseshoe-shaped antenna with multi-L slots for 2.4/5-GHz wireless local area network (WLAN) operations is designed and fabricated. To obtain sufficient bandwidth when return loss (RL) < −10dB, multi-L slots are inserted (2.4 GHz) in the patch and a coaxial probe source is used. The measured result of the fabricated antenna is a 10.6% bandwidth from 2.38 to 2.51 GHz and a 28.4% bandwidth from 5.10 to 5.88 GHz (RL < −10dB), the gain 2.04–2.58 dBi. And a good radiation pattern is achieved over the WLAN band (2.4–2.484 GHz and 5.15–5.825 GHz) range. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 463–465, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24096</P>
MB-OFDM 시스템을 위한 Low-rank LMMSE 채널 추정 및 주파수 옵셋 추정 결합 기법
신선경(Sun-Kyung Shin),남상균(Sang-Kyun Nam),성태경(Tae-Kyung Sung),곽경섭(Kyung-Sup Kwak) 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.12A
본 논문에서는 MB-OFDM 시스템에 적합한 낮은 복잡도의 채널 및 주파수 옵셋 결합 추정법을 제안한다. 제안된 기법은 적절한 랭크(rank) 수를 적용함으로써 복잡도를 낮추는 Low-rank LMMSE 채널 추정법을 이용하여 채널을 추정하고, 주파수 옵셋 추정을 위해 추정된 채널의 자기상관특성을 이용하는 간단한 구조를 추가함으로써 낮은 복잡도로 채널과 주파수 옵셋을 결합하여 추정하는 기법이다. 제안된 알고리즘을 IEEE 802.15 TG3a에서 제시한 4가지 UWB 채널 모델에서 모의 실험하여 기존의 LS 채널 추정법을 사용한 알고리즘과 성능을 분석하였고, 복잡도를 낮추기 위해 각 채널 모델 환경에 따라 적절한 수의 랭크 수를 적용하여 결과를 비교하였다. In this paper, we propose joint estimation methods of carrier offset and channel estimation for MB-OFDM system with low complexity. The proposed methods estimate the channel by using low-rank LMMSE channel estimation which reduces the system complexity by applying the optimal number of rank to evaluate the frequency offset and additionally using the simple algorithm using the auto-correlation property of the estimated channel. We simulate the proposed algorithms under the IEEE 802.15 TG3a UWB channel model.
아스피린을 장기 복용한 환자의 갑상선 결절에서 초음파 유도하 세침흡인생검 후 생긴 심한 출혈
정혜경,김은경,김민정,곽진영,박정수<SUP>1<,SUP>,Hae-Kyoung Jung,Eun-Kyung Kim,Min Jung Kim,Jin Young Kwak,and Cheong Soo Park,<SUP>1<,SUP> 대한갑상선-내분비외과학회 2007 The Koreran journal of Endocrine Surgery Vol.7 No.1
Ultrasound-guided fine needle aspiration biopsy (USFNA) is a very useful procedure for the diagnosis and management of thyroid diseases. It is very safe procedure and complications have been rarely reported. We experienced a case of an extensive hemorrhage after USFNA of the thyroid nodule in a patient undergoing long-term aspirin therapy. We emphasize that it is very important to obtain a patient history carefully before performing a USFNA. (Korean J Endocrine Surg 2007;7:39-41)