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Yong Guk Kim,Hong Kook Kim,Yong Ju Lee,Dae Young Jang,Inseon Jang,Kyeongok Kang 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In this paper, we propose a sound externalization method for out-of-the-head localization in a headphone listening environment. There have been several externalization methods proposed that use a head-related transfer function (HRTF) or early reflections. However, such conventional methods have drawbacks such as timbre distortion due to the use of a measured HRTF and reverberation. On the other hand, the proposed externalization method here integrates a model-based HRTF and reverberation. To evaluate the performance of the proposed method, white noise and several audio samples belonging to two different music genres are prepared. Subjective listening tests are then conducted to evaluate the perceptual quality and measure the perceptual distance. It is shown from the experiments that the proposed externalization method provides better audio quality and longer perceptual distance than the conventional methods.
헤드폰 청취환경에서의 실감 오디오 재현을 위한 음상 외재화 기법
김용국(Yong Guk Kim),전찬준(Chan Jun Chun),김홍국(Hong Kook Kim),이용주(Yong Ju Lee),장대영(Dae Young Jang),강경옥(Kyeongok Kang) 大韓電子工學會 2010 電子工學會論文誌-SP (Signal processing) Vol.47 No.5
본 논문에서는 헤드폰 재생 환경에서의 머리 밖 음상정위를 위한 음상 외재화(externalization) 기법을 제안한다. 제안된 기법에서는 기존의 머리전달함수(HRTF) 또는 초기 반사음 등을 이용한 외재화 기법들에서 발생하는 정위된 음성의 음색 왜곡을 줄이는 것에 그 초점을 맞춘다. 즉, 제안된 음상 외재화 기법은 모델 기반의 HRTF와 잔향 기법을 결합하고, 전방 음상 외재화의 성능 향상을 위하여 decorrelation 및 spectral notch 필터링 기법 등을 포함한다. 제안된 음상 외재화 기법의 성능을 평가하기 위하여 백색잡음, 효과음, 음성 및 오디오 등 다양한 장르의 음원을 이용하여, 평가자의 주관에 의한 청취평가를 수행하였다. 제안된 음상 외재화 알고리즘은 성능평가 결과에서 기존의 방법에 비해 더 좋은 외재화 거리 성능을 보였다. In this paper, a sound externalization method is proposed for out-of-the-head localization in a headphone listening environment. In order to reduce timbre distortion by the conventional methods using a measured a head-related transfer function (HRTF) or early reflections, the proposed method integrates a model-based HRTF with reverberation. In addition, for improving frontal externalization performance, techniques such as decorrelation and spectral notch filtering are included. To evaluate the performance of the proposed externalization method, subjective listening tests are conducted by using different types of sound sources such as white noise, sound effects, speech, and music. It is shown from the test results that the proposed externalization method can localize sound sources farther away from out of the head than the conventional method.
이용엽,손준광,이용국,신홍주,박옥영,최연수,이승,길광채,홍순표 朝鮮大學校 附設 醫學硏究所 2004 The Medical Journal of Chosun University Vol.29 No.1
An aneurysm of the pulmonary artery is a rare entity and a current knowledge is mainly derived from autopsy findings, Pulmonary artery ancurysms arc associated with congenital heart disease : patient ductus arteriosus, ventricular septal detect, atrial septal defect and etc. In the remaining cases, such aneurysms are associated mainly with secondary acquired lesions, such as Behcet's disease, bacterial endocarditis, syphilis, tuberculosis, atherosclerosis, vasculitis, hypertension and trauma. We experienced a case of primary pulmonary artery ancurysm with pericardial effusion detected on a echocardiography in a 79 year-old female. A computed tomographic scan and pulmonary angiography showed dilatation of the main and proximal pulmonary arteries, accompanying by pericardial effusion. We report this case with a brief review of literature. 폐동맥류는 그 빈도가 매우 드물며 저자들은 호흡곤란을 호소하는 폐동맥류 1례를 경험하였기에 보고하는 바이다.
CNO-Cycle과 H-H Chain에 關한 硏究 : 太陽과 恒星의 Energy源에 對하여
曺炷煥,金容局 朝鮮大學校 師範大學 1974 師大論文集 Vol.5 No.-
This paper attempts to examine the enormous source of energy of the sun and the process of mysterious heat generation of the fixed stars on the basis of the reaction occuring around the sun and the fixed stars. The enormous energy of the sun and the fixed stars can be explained with the CNO-cycle and the H-H chain reaction.
Extradural Chondroma on the Lumbar Spine: A Case Report
Kim Yong Guk,Kim Tae Wan,Kim Eun Ju,Park Kwan Ho 대한말초신경학회 2020 The Nerve Vol.6 No.2
Chondromas are benign tumors originating from cartilaginous structures. Chondromas located on the spine are rare. We report the case of a 74-year-old woman who complained of back pain and right lower extremity radiating pain. Magnetic resonance imaging revealed an oval-shaped mass-like lesion in the epidural space at the right foraminal zone on L2-3. The mass had intermediate signal intensity on T1- and T2- weighted images. She underwent surgical tumor removal and the symptoms gradually improved. The mass lesion was confirmed by histopathological examination as a chondroma. We report a rare case of lumbar spinal chondroma accompanied by radicular symptoms.