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여러 입력 여러 출력 시스템에 알맞도록 너비를 먼저 탐색하는 가장 비슷함 복호 방식
강현구,송익호,안태훈,김윤희,Kang, Hyun-Gu,Song, Iick-Ho,An, Tae-Hun,Kim, Yun-Hee 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.1C
여러 입력 여러 출력 시스템에서 쓰는 복호 방식인 공 복호기는 깊이를 먼저 탐색하는 가장 비슷함 복호 방식이다. 이 논문에서는 너비를 먼저 탐색하는 방법을 바탕으로, 여러 입력 여러 출력 시스템에 알맞은 새로운 가장 비슷함 복호기를 제안한다. 제안한 복호기는 가장 비슷함 검파기와 비트 오류율이 같으며 공 복호기보다 계산량이 꽤 적다는 것을 모의실험으로 보인다. The sphere decoder (SD) has recently been proposed to perform maximum likelihood (ML) decoding for multi-input multi-output systems. Employing a 'breadth-first' searching algorithm for closet points in a lattice, we propose a novel ML decoding scheme for multi-input multi-output systems. Simulation results show that the proposed scheme has the same bit error rate performance as the conventional ML decoders while allowing significantly lower computational burden than the SD.
강현구,김근해.Hyun-Gu Kang. M.D.. Keun-Hae Kim. M.D. 대한안과학회 2008 대한안과학회지 Vol.49 No.1
Purpose: To evaluate the incidence and examine the development of oculocardiac reflex during ptosis operation under local anesthesia. Methods: Twenty-eight patients (52 eyes) who underwent ptosis operation under local anesthesia participated in this prospective study. We examined the change of heart rate. We also investigated the incidence of oculocardiac reflex and analyzed factors associated with it. Results: The mean preoperative heart rate was 76.06±11.24 beats/min. During local anesthetic injection, skin incision, traction of the central fat pad, traction of the medial fat pad, traction of the levator palpebrae muscle, the mean heart rates were 74.81±12.64 beats/min, 74.73±12.20 beats/min, 73.63±11.73 beats/min, 73.35±12.24 beats/min, 71.44±11.93 beats/min respectively. Hence, the mean heart rate decreased during each successive part of the operation. The oculocardiac reflex was positive in 24 (46.2%) of 52 eyes. There was no significant difference between the incidence of oculocardiac reflex in males and females. The incidence of oculocardiac reflex was highest during traction of the levator palpebrae muscle. Conclusions: During ptosis operation under local anesthesia, oculocardiac reflex can occur. Gentle manipulation of surgical tissues and cardiac monitoring is needed to prevent side effects from oculocardiac reflex.
A Modified Fault Distance Calculation in the Power Quality Monitoring System
강현구(Hyun-Gu Kang),정일엽(Il-Yop Chung),원동준(Dong-Jun Won),문승일(Seung-Il Moon) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper proposes a new fault distance calculation method in the power quality (PQ) monitoring system. The proposed method calculates the fault impedance and the fault distance based on the measurement data of the PQ monitors and the information of the topology of the distribution systems. By using the iterative calculation method, the proposed method can find more exact location of the PQ events than the exisitng methods. The proposed method is applied to the IEEE 34 bus test feeders by using the PSCAD/EMTDC™.
수신 다양성을 쓰는 인지 무선통신에 알맞은 새로운 주파수 검출 기법
강현구(Kang, Hyun Gu),송익호(Song, Iickho),배진수(Bae, Jinsoo),민황기(Min, Hwang-ki),김동진(Kim, Dongjin) 한국정보전자통신기술학회 2010 한국정보전자통신기술학회논문지 Vol.3 No.4
이 논문에서는 수신 다양성을 쓰는 인지 무선통신에 알맞은 새로운 주파수 검출 기법을 제안한다. 제안한 기법은 일반화된 비슷함비 검정 검파기와 비선형 다양성 결합 기법을 바탕으로 둔 바, 충격성 환경에서도 주파수 검출 성능이 꽤 뛰어나다. 제안한 주파수 검출 기법이 이제껏 널리 쓰이던 주파수 검출 기법들보다 검출 성능이 안정적이며 특히 충격성 환경에서 성능이 뛰어나다는 것을 이론적인 분석과 모의실험으로 보인다. In this paper, we propose a class of spectrum sensing schemes for cognitive radio with receive diversity. By considering the generalized likelihood ratio test detector in each branch and exploiting non-linear diversity combining strategy, the proposed scheme exhibits reasonable performance for spectrum sensing even in the environment of heavier-tailed noise. From the results of analysis and computer simulations, it is observed that the proposed scheme provides significant performance gain and performance stability over the conventional schemes, especially in impulsive noise environment.
강현구(Hyun-gu Kang),옥연호(Yun-Ho Ok),김영국(Yong-kuk Kim),이붕용(Bung-yong Lee),한호연(Ho-yeon Han),임재일(Jae-il Lim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The role of the Speed relay of the water turbine generator is to measure the rotation speed of it and find out that the present speed condition is proper for the generator system. So it is necessary to check up the equipment regularly. This study shows the theory of the speed relay and the solution about the malfunction caused by the characteristic change of the relay.
랫드에서 Butylated Hydroxyanisole에 의한 Glutathione S-Transferases 유도 및 Cyclophosphamide로 유발된 기형에 대한 예방효과
강현구(Hyun-Gu Kang),이창희(Chang-Hee Lee),이기창(Ki-Chang Lee),이지은(Jee-Eun Lee),김하정(Ha-Jung Kim),최은경(Eun-Kyoung Choi),윤영원(Young Won Yun),김윤배(Yun-Bae Kim) 한국독성학회 2003 Toxicological Research Vol.19 No.3
Effects of repeated treatment with butylated hydroxyanisole (BHA) on the induction of glutathione S-transferases (GSTs) and teratogenicity of cyclophosphamide were investigated in rats.<br/> Pregnant rats were orally treated with BHA (50 mg/kg) for 7 days, from days 6 to 12 of gestation, and intraperitoneally challenged with cyclophosphamide (15 mg/kg) 2 hr after the final treatment. On day 20 of gestation, the maternal and fetal abnormalities were examined. Separately, a part of rats was sacrificed for the assay of hepatic and placental GSTs activities on day 12 of gestation following 7-day treatment with BHA. Cyclophosphamide, administered on day 12 of gestation, induced 43.2% of fetal death and resorption, and 100% of malformations in live fetuses, in contrast to low fetal resorption (8.7%) and malformations (8%) in control group. The malformations include cranial defect and exencephaly<br/> (100%), micrognathia and tongue extrusion (100%), limb defects (40%), renal pelvic dilatation (39%), and cleft palate (15%). Interestingly, BHA induced GSTs activities by 62% and 46% over<br/> the control in liver and placenta, respectively, and remarkably reduced the fetal resorption (13.9%) and malformations, resulting in 62% of cranial defect and exencephaly, 68% of micrognathia and<br/> tongue extrusion, 29% of limb defects, and 14% of renal pelvic dilatation. Taken together, it is suggested that a long-term pretreatment with BHA could substantially prevent fetuses from abortion and malformations following intrauterine exposure to teratogens including cyclophosphamide by inducing phase Ⅱantioxidant enzymes such as GSTs.