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광대역 chirp 신호의 방위각 추정을 위한 적응 빔 형성
김정수,최병웅,배은현,이균경,Kim, Jeong-Soo,Choi, Byung-Woong,Bae, Eun-Hyon,Lee, Kyun-Kyung 한국음향학회 2008 韓國音響學會誌 Vol.27 No.2
In this paper, the adaptive chirp beamforming method is proposed to solve the bias problem in the direction-of-arrivals (DOAs) estimation of the wideband chirp signals which have an identical time-frequency parameter and are emanated from different directions. The source location bias results from the interferences impinging on the array from the other directions. The proposed method exploits the time-frequency structure of the chirp signal based on STMV (STeered Minimum Valiance) to improve the DOA estimation performance by minimizing the chirp interferences effectively. Simulation results show the DOA estimation performance achieved by the proposed method as compared to the conventional methods. 본 논문은 동일한 주파수 파라미터를 가지고 다른 방위에서 입사하는 chirp신호의 방위각 (DOA : Direction-of-arrival) 추정에서 상호 간섭으로 인한 bias문제를 해결하기 위하여 적응 chirp 빔형성기법을 제안한다. 제안한 기법은 기존의 STMV (STeered Minimum Variance)기법에 chirp 신호의 시간-주파수 특성을 고려함으로써 chirp신호들의 상호 간섭을 보다 효과적으로 감소시켜 방위각 추정성능을 향상시킨다. 모의 실험에서 제안한 기법과 기존의 기법들에 의한 방위각 추정성능을 비교한다.
가정용 응축식 의류건조기의 에너지 효율 개선을 위한 모델링
김정수(Jung Soo Kim),구유선(You Sun Ku),전시문(Si Moon Jeon),홍경섭(Kyung Seop Hong),임광옥(Kwang-ok Lim),이관수(Kwan-Soo Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
We propose a mathematical model on the characteristics of drying process and heat and mass transfer in a domestic condensing dryer to improve its energy efficiency. Experiments are also carried out to verify numerical results. We estimate temperature of the drum and the clothes separately, and perform thermal analysis of the heat exchanger using heat exchangelet method. The numerical results such as drum inlet temperature, RMC, drying time and SEC are in a good agreement with experimental data. A parameter study is also carried out to investigate the effects of each variable on dryer performance.
김경섭(Kyung-Seob Kim),조상희(Sang-Hee Cho),김일온(Il-on Kim),김정수(Jong-Soo Kim) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.5
공기압축기에서 생성된 공기는 주로 출입문, 제동 및 2차 현수장치에 사용되는데, 본 연구에서는 2호선 영국형 쵸퍼전동차 주공기의 압력저하에 따른 비상제동체결로 운행장애의 원인이 되는 것을 분석하였다. 그 결과 기온이 급강하하는 동절기와 승객의 혼잡도가 심한 구간에서 이 현상이 빈번하게 발생되었다. 또한 차체 평형을 유지시키는 2차 현수장치인 공기스프링의 탄성저하 및 패킹부 이상마모에 따른 누기량이 주공기의 충기를 방해하였다. 이와 같은 문제점을 해결하기 위하여 공기압축기를 직립 기동하여 모터회전수를 증가하여 주공기압력의 충기시간을 단축함에 따라서 압력저하를 방지하였다. The air which creates from the air compressor is mainly used doorway, brake and secondary suspension, In this study analyzed the cause of the operation obstacle which in drop of main air pressure to chopper subway line 2 of british type. This phenomenon frequently occurred from the segment where the be congested degree of passenger and the winter when temperature steep dives. Also the dampness which follows in attrition of above elastic decrease and packing department of the air spring which is a secondary suspension which maintains the equilibrium of the vehicle disrupted insect main pressure. In order to solve this problem the air compressor directness maneuvers increased revolution number of a motor and according to hours insects shortened of main pressure prevented a pressure drop.
임상연구 : 간우엽 공여술 후 혈액응고 상태의 변화와 경막외 카테터 사용 시의 의미
최수주 ( Soo Joo Choi ),곽미숙 ( Mi Sook Gwak ),김갑수 ( Gaab Soo Kim ),이준용 ( Jun Yong Lee ),김태형 ( Tae Hyeong Kim ),김진경 ( Jin Kyung Kim ),김정수 ( Chung Soo Kim ),정익수 ( Ik Soo Chung ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.6
Background: Living donors for liver transplantations may have a low pain threshold and should be given effective postoperative pain control. However, epidural catheterization has been the subject of intense debate because of the possibility of severe coagulation derangement after a right hepatectomy. This study examined the changes in the coagulation status in right lobe donors. Methods: The charts and computerized hospital data of 261 consecutive living donors who had undergone right hepatectomy were retrospectively reviewed. The coagulation profile including the platelet count, prothrombin time (PT), and activated partial thromboplastin time (aPTT) was analyzed at the preoperative period, immediately after surgery, and 5 days after surgery. Results: The platelet count decreased significantly from immediately after surgery until postoperative day (POD) 5 (P < 0.001). Nineteen donors (7.3%) had a minimum platelet count of < 100 × 103/mm3, and no case showed a platelet count of < 50 × 103/mm3. The PT increased significantly and reached at peak at POD 1 (1.56 ± 0.19 INR), and the PT values until POD 5 were significantly different from the preoperative values (P < 0.001). However, the peak PT was > 2.0 INR in only 4 donors (1.5%). The aPTT immediately after surgery showed severe prolongation (P < 0.001), but recovered rapidly on POD 1. Conclusions: Right lobe donors showed postoperative coagulation derangement but the changes appear to be acceptable for the maintenance and removal of the epidural catheters. These results suggest that careful epidural catheterizations are relatively safe in right lobe donors. (Korean J Anesthesiol 2006; 51: 685~9)
경쾌수 ( Kwae Soo Kyung ),송영수 ( Young Soo Song ),한성훈 ( Seong Hun Han ),김정수 ( Jung Su Kim ),이혜경 ( Hye Kyung Lee ),이윤우 ( Yun Woo Lee ) 대한류마티스학회 1995 대한류마티스학회지 Vol.2 No.1
Dermatomyositis is a group of connective tissue disorders characterized by nonsuppurative inflammation of the skeletal muscle and skin lesions. It is associated with malignancy, especially of the stomach, lung, overy and breast. we report a case of dermatomyositis with uterine cervical concer. A 78 year old female patient was admitted because of progressive proximal muscle weakness, skin rashes, and vaginal spotting. She was bedridden because of severe proximal muscle weakness and atrophy, unable to elevate her head, and suffered from dysphagia. Gottron`s patches were found on the knuckles of the hands, scaly erythematous rashes on the extensor surfaces of bilateral elbows, wrists and knees. The serum concentrations of muscle enzymes were elevated, the biopsy of quadriceps muscle showed the features compatable with myositis, and the uterine cervical biopsy revealed squamous cell carcinoma, which was determined to be in stage IIb by pelvic CT. Radiotherapy(total 3240 cGy) was done for the cervical cancer and prednisolone (initially 60mg/day) was given for the dermatomyositis. The muscle power improved only a little although the concentrations of serum muscle enzmes returned to normal. She deceased of aspiration pneumonia 43 days after the admission.