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협대역 소나시스템에서 도플러 천이에 강인한 고속 LFM 표적 검출기법
최상문(Sang-Moon Choi),도대원(Dae-Won Do),김우식(Woo-Sik Kim),이동훈(Dong-Hun Lee),김형문(Hyung-Moon Kim) 대한전자공학회 2014 전자공학회논문지 Vol.51 No.8
LFM 신호를 이용하여 속도가 변화하는 표적의 존재 유무를 검출하는 기존의 소나시스템에서는 다수의 LFM 도플러 상관기를 통해 얻은 결과들을 시간상에서 정렬시킨 후 최대값을 테스트 셀로 선택하여 사용한다. 이때 정밀한 표적 검출을 하기 위해서는 많은 수의 LFM 도플러 상관기들이 필요하며, 이로 인해 요구되는 연산량과 메모리도 역시 증가하게 되어 정밀한 LFM 표적 검출기를 실제 구현하는 것을 어렵게 한다. 본 논문에서는 LFM 신호를 사용하는 소나시스템에서 표적 속도 변화에 강인하면서도 고속으로 표적 존재 유무를 검출하기 위한 새로운 기법을 제안하였다. 제안하는 기법에서는 많은 수의 LFM도플러 상관기들의 정렬된 결과를 합하여 테스트 셀을 만들었으며, 이를 통해 SNR을 향상시킬 뿐만 아니라 표적 속도 변화에 강인한 SNR 값을 제공하여 검출기의 성능을 향상시킨다. 또한 제안하는 기법은 많은 수의 LFM 도플러 상관기들의 정렬된 결과를 합하는 과정을 하나의 합필터로 구현하여 연산량을 획기적으로 줄임으로써 표적을 고속으로 검출할 수 있게 하였다. In a conventional sonar system, which uses LFM signal for detecting targets with varying speed, the results of multiple LFM Doppler correlators are aligned and the maximum alined result are selected as a test cell for detecting targets. As the number of the LFM Doppler correlators are increased for accurate target detection, as the required computational complexity and the memory are also increased. This fact makes it difficult to implement the accurate LFM target detector. In this paper, we propose a new fast target detection which is robust for the variation of target speed. Because the proposed method uses the summation of alined results of large numbers of LFM Doppler correlators, the proposed method increase SNR and provide robust SNR for the variation of target speed. And the proposed method can provide very fast target detection by implementing the process, the summation of alined results of large numbers of LFM Doppler correlators, as one summation filter.
최상문 한국회계정보학회 2011 재무와회계정보저널 Vol.11 No.1
This paper reviews the empirical accounting research in China in the last ten years. We first depict a big picture of the literature and then give some critical reviews on each important area. Our focus is on the research problems and the weakness of research designs. Basing on the literature we reviewed, we provide our perspective on the prospect of empirical accounting study in China. The structure of our paper is different with other review papers in that we propose a framework of the empirical accounting study surrounding accounting information, and then review relevant topics according to the framework. 본 논문에서는 첫째, 중국 회계학계의 실증적 회계연구의 발전과 최근의 동향을 설명하고, 그 이론적 성과를 정리하였다. 둘째, 중국학계의 실증적 회계연구의 연구방법론상의 문제점을 지적하고, 향후 실증 회계연구의 발전 방향을 제시하였다.
최상문,송승한,강낙헌 대한성형외과학회 2011 Archives of Plastic Surgery Vol.38 No.1
Purpose: Nasotracheal or oral intubation procedure is widely used for facial bone fractures. However, during the operation intubated tube can interfere or obstruct the view of the operator. We authors used a modified submental intubation method in panfacial bone fracture patients for intact airway and the operation view. Methods: After intravenous induction of anaesthesia, traditional orotracheal tubation was done. A horizontal incision was made 2 cm from the midline, 2 cm medial to and parallel with the mandible in the submental region.1 In order to approach to the floor of the oral cavity, a haemostat was pushed through the soft tissues. A chest tube front cover was applied to the intubation tube and the tube was inserted through the submental tunnel. Orotracheal tube was disconnected and pulled back through the soft tissue and secured with a suture. Results: The procedure took about 30 minutes and there were no problems during the intubation. Intraoral manipulation and occlusal checks were free without any interference. Extubation was also easily done and complications such as lung aspiration, infection, hematoma, or fistula did not occur. Conclusion: Submental endotracheal intubation is fast, safe, easy to use and do not have to concern about the tube being pull back again. Conventional submental intubations are being held without any coverage of the tip. We authors applied the modified method to the trauma patients and the results were satisfied. From above advantages, modified submental intubation is widely available not only in fractured patients, but also in aesthetic or orthognathic surgeries.
최상문(Choi Sang-Moon),김확열(Kim Hwak-Yeol) 부산대학교 한국민족문화연구소 2008 한국민족문화 Vol.32 No.-
This paper discusses the comparison of commercial morality between Song merchants and Jin merchants. Commercial morality covers merchants consciousness, merchants moral character, commercial policy and management system. The findings of this study can be summarized as follows. In the sprit of merchants, Song merchants may be defined as justice(義), credit(信), frugality(實). But Jin merchants may be defined as honesty(誠), credit(信). In the organizatinal management system, Song merchants had adopted Song-bang (松房), Cha-in system (差人制度). Jin merchants had Storekeeper system (掌櫃負責制), labor-sharing system (人身頂股制). This system prescribed that the hired hands could share out bonus with shareholders. In the credit system, Song merchants had a unique credit system as Si-beon system(時邊制). But Exchange Shop(票?) by Jin merchants had been brilliant in the credit system. In the accounting system, Song merchants had Sagae-Chibu booking system (四介治簿法). Jin merchants also had Long-Men-Zhang(龍門帳). Both bookkeeping system was journalized as four factors by double entry. The causes of the rise and decline of Song merchants and Jin merchants was measures taken by two merchants, including the morality and concept, engaging in trade with virtue, seizing opportunities, pursuiting privilage, credit restrain, management system and employing no outsiders.