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주변 배경음에 강인한 구간 검출을 통한 음원 인식 및 위치 추적 시스템 설계
김우준(Woo Jun Kim),김영섭(Young Sub Kim),이광석(Gwang Seok Lee) 한국전자통신학회 2016 한국전자통신학회 논문지 Vol.11 No.8
본 논문은 비정상 상황 시 발생하는 음원에 대해 주변 환경 음에 강인한 음원 구간을 검출하여, 구간내의 신호를 이용한 음원 인식 과 위치 추적 시스템 설계에 관한 연구이다. 강인한 음원 구간 검출은 수신되는 오디오 신호로부터 단 구간 가중 평균 델타 에너지를 계산하여, 저역 통과 필터에 입력 후, 출력되는 결과 값들의 비교를 통해 배경음에 강인한 구간을 정의 하며, 음원 인식은 검출된 구간 내 데이터로부터 종래의 인식방법인 HMM(: Hidden Markov Model)을 이용해, 음원 인식 정보를 생성하여 학습 및 인식을 한다. 이는 주변 배경음이 포함된 음원 신호에 대해 기존 신호의 에너지를 이용해 구간을 검출 후, HMM을 통한 인식에 비해 3.94% 상향된 인식률을 보인다. 또한 인식 결과를 바탕으로 구간내의 신호간의 TDOA(: Time Delay of Arrival)를 이용한 위치 파악은 실제 발생 위치와의 각도와 97.44%일치함을 보인다. This paper is on a system design of recognizing sound sources and tracing locations from detecting a section of sound sources which is strong in surrounding environmental sounds about sound sources occurring in an abnormal situation by using signals within the section. In detection of the section with strong sound sources, weighted average delta energy of a short section is calculated from audio signals received. After inputting it into a low-pass filter, through comparison of values of the output result, a section strong in background sound is defined. In recognition of sound sources, from data of the detected section, using an HMM(: Hidden Markov Model) as a traditional recognition method, learning and recognition are realized from creating information to recognize sound sources. About signals of sound sources that surrounding background sounds are included, by using energy of existing signals, after detecting the section, compared with the recognition through the HMM, a recognition rate of 3.94% increase is shown. Also, based on the recognition result, location grasping by using TDOA(: Time Delay of Arrival) between signals in the section accords with 97.44% of angles of a real occurrence location.
김우준(Kim, Woo-June),박창호(Park, Chang-Ho),조경석(Cho, Kyung-Seok),오창훈(Oh, Chang-Hoon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
FCEV uses electric energy which generated from the reaction between Hydrogen and Oxygen in fuel cell stack as driving force. As fossil fuels are exhausted, fuel cell is regarded as a potent substitute for next generation energy source, and thus, most of car-makers make every efforts to develop fuel cell electric vehicle (FCEV). In addition, fuel cell is also beneficial in aspect of environment, because only clean water is produced during chemical reaction process instead of harmful exhausted gas. Generally, Hydrogen is supplied from high-pressured fuel tank, and air blower (or compressor) supply Oxygen by pressurizing ambient air. Air blower which is driven by high speed motor consumes about 7{sim}8 % of energy generated from fuel cell stack. Therefore, the efficiency of an air blower is directly linked with the performance of FCEV. This study will present the development process of an air blower and its consisting parts respectively.
김우준(Kim, Woo-June),박창호(Park, Chang-Ho),지용준(Jee, Yong-Jun),조경석(Cho, Kyung-Seok),김영대(Kim, Young-Dae),박세영(Park, Se-Young),오창훈(Oh, Chang-Hoon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
FCEV uses electric energy generated from fuel cell stack, thus all consisting parts must be re-designed to be suitable for electricity based system. Cathode air blower which supplies compressed air into fuel cell stack has similar shape of turbocharger, but a radial turbine of traditional turbocharger is removed and high speed BLDC motor is installed . Generally, maximum 10% of electric power of fuel cell stack is consumed in air blower, therefore an effective design of air blower can improve the performance of FCEV directly. This study will present an aerodynamic design process of an air blower and compare computational results with experimental data.
김우준(Kim, Woo-Jun) 백산학회 2009 白山學報 Vol.- No.83
It is between the late 1990s and the early 2000s that China and the rest of the world began to agree that the rise of China means the rise of a great power. Chinese themselves claim that the rise of China is identical to the rise of great powers in the history. Throughout the Chinese history, China has been pressing its own version of international order with both military and non-military means, expanding its national territory. A rising China in the 21st century never hesitates to expand its influence. As power shift is not obvious in East Asia as well as in the rest of the world, China maintains its cooperative posture, but, the way ahead is unpredictable and many cannot help worrying about the negative dimension to the rise of China. Analysis of the relationship between the rise of China and the Chinese claim to the islands in the South China Sea shows that the greater China has become, the more aggressive it has turned in its territorial claims. In other words, China changes its posture on territorial issues in proportion to changes in its national might. Issue of the islands in the South China Sea finds its presence in the maritime border strategy of China, which President Hu Jintao has mentioned. Announcing that China is transforming itself into a sea power from a continental power, he emphasized the need to build military might commensurate with its presence as a political and economic power. In addition, he underscores that other countries are occupying some of Chinese islands and sunken rocks illegally and claims that China is the only nation that has continental shelf. China argues that the issues of the islands in the South China Sea came about, as the neighboring countries occupied the islands on after another in the midst of commotion that engulfed China during the Cultural Revolution. China built military bases in the Paracel Islands and the Spratly Islands that it claims as territory and included them in its administrative jurisdiction. China also built a large nuclear submarine base in Hainan Island at the mouth of the South China Sea, which indicates the aggressive posture of China. Concerning the race of China and the U.S. to secure regional hegemony over the islands in South China Sea, Chinese scholars conclude that the U.S., a 3rd party to the territorial issue in the South China Sea, is trying to intervene and lay siege to China. The sea power strategy of China and the Asia-Pacific strategy of the U.S. are colliding head on in the South China Sea. China analyzes that if it clashes with one of the U.S. allies in the South China Sea militarily, the U.S. will intervene, which will pose a serious threat to the Chinese claims to its territories and interests in the sea. They predict with confidence that the U.S. will not be able to win a full-blown war with China.