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한동철,이기승,차일환,윤대희,Han, Dong-Chul,Lee, Ki-Seung,Cha, Il-Hawan,Youn, Dae-Hee 한국음향학회 1995 韓國音響學會誌 Vol.14 No.2
본 논문에서는 음성 신호가 가지고 있는 중요한 특성을 유지하면서 발음 속도만을 변화시키는 시간축 변환 방법을 범용 디지탈 신호 처리 프로세서를 이용하여 실시간으로 구현하였다. 음성 신호 시간축 변환은 음성 신호의 발음 속도만을 변화시키기 때문에, 입력 신호와 변환 신호간의 시간적 차이가 발생하여 실시간 처리가 불가능하다. 본 논문에서는 이러한 입력, 변환 신호간의 시간차를 해결하기 위해서, 카세트 테이프 레코더의 모터 회전 속도를 조절하는 것과 같은 물리적 시간축 변환으로, 입력 음성 신호를 느리게 또는 빠르게 변환시켜 그 신호를 실시간 시스템의 입력으로 사용하였다. 카세트 레코더의 주행 속도만을 조절하는 물리적 변환은 원 신호의 피치 정보를 왜곡시켜, 원 음성의 특성을 변화시키기 때문에, 본 연구에서는 FIR 필터를 이용한 피치 보정 기법으로 왜곡된 신호를 원신호로 복원한 후, SOLA 시간축 변환 방법을 이용하여, 복원된 신호를 카세트 레코더의 모터 속도에 맞추어 시간축으로 변환하는 시스템을 실시간으로 구현하였다. 구현된 알고리듬으로 음성 신호를 시간축으로 변환하는 실험에서, 16비트 해상도를 가진 ADSP2101 프로세서로 구현한 결과와 컴퓨터 시뮬레이션 결과를 비교할 때 평균 구간 신호 대 오차비가 대략 20dB로 두 결과가 거의 유사함을 알 수 있었다. A time scale modification method yielding rate-modified speech while conserving the characteristic of speech was implemented in real-time using a goneral purpose digital signal processor. Time scale modification changed pronunciation speed only, producing a time difference between the input signal and the modified signal, making it impossible to implement it in real-time. In this thesis, a system was implemented to remove the time difference between the input and modified signals. Speech signals slowed down or speeded up by a physical time scale modification method, such as adjusting the motor speed of the cassett tape recorder, was used as the input signal. Physical modification that controled only the inter speed of the cassette tape player distorted the pitch period of the original speech. In this study, a real-time system was implemented so that the pitch-distorted speech was reconstructed back to the original by fractional sampling pitch shifting using an FIR filter, and this signal was time scale modified to match the cassette tape recorder motor speed using SOLA time-scale medification. In experiments using speech signals medifiedby the proposed method, results obtained using a 16-bit resolution ADSP2101 processor and using computer simulations employing floating point operations showed about the same average frame signal-to-noise ratio of about 20 dB.
페니토인의 장기 복용으로 발생한 감각운동성 다발성 신경병증
한동철,박현미,신동진,이영배,Han, Dong-Chul,Park, Hyeon-Mi,Shin, Dong-Jin,Lee, Yeong-Bae 대한임상독성학회 2006 대한임상독성학회지 Vol.4 No.2
Phenytoin has been used globally as an effective anticonvulsant. Among its adverse effects, peripheral neuropathy including polyneuropathy has sometimes been reported. We report a case of sensorimotor polyneuropathy associated with high serum level and long-term phenytoin therapy. A 29-year-old male presented with motor weakness in all extremities. He was treated with phenytoin (400 mg/day) for about eight years because of generalized tonic clonic seizure. During none conduction assessment, sensorimotor polyneuropathy was discovered.
베어링 폭의 영향을 고려한 동수압 베어링에 지지된 회전축 시스템의 횡진동 특성
한동철,최상현,김우정,조명래,Han, Dong-Chul,Choi, Sang-Hyun,Kim, Woo-Jeong,Cho, Myung-Rae 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.12
This paper presents the characteristics of lateral vibrations of rotor system supported by hydrodynamic journal bearings. Finite element model is developed for the dynamic analysis of rotor system. Hydrodynamic bearings are modeled with the distributed springs and dampers in shape of the 2nd order polynomials in the direction of bearing width. Experiments are conducted to measure the natural frequency, and experimental results are compared with the theoretical results that are calculated using the point model and distributed model. Theoretical results using the distributed model agrees better with the measured results as bearing width increases. Also, this method is applied to actual three-stage turbo blower model. Then, critical speed and forced vibration analysis are performed.
한동철(Han Dong-chul),성희승(Sung Hee-seung) 한국전자상거래학회 2001 전자상거래학회지 Vol.2 No.1
Businesses based on online are becoming increase and important. The importance of online brand building has been rapidly gaining ground in recent years. Therefore it is vital to understand what affects the online brand equity. The concept of Brand equity has emerged as one of the most critical areas for marketing in the 1990s. Despite interest in the subject, however there is a little empirical study about online brand equity.<BR> This study applies the concept of brand equity to setting of brands in virtual environment. This concept explains brand building strategy and operation of online business which goals is building strong brand on online.<BR> Thus this study investigates three research questions. First, what is online brand equity? Second, Are values of web sites, which were informativeness, entertainment, and organization of web site affect on brand equity or not? Research model was tested against the data acquired from membership users in online businesses.<BR> We have found relationship between two of web site values, which were Informativeness and entertainment and all of brand equity components are significant but organization of site have related to intimacy only.
한동철(Dong-Chul Han) 한국노년학회 1998 한국노년학 Vol.18 No.1
지난 70년대 초부터 현재까지 미국에서 노인들의 제품과 서비스에 대하여 연구가 꾸준히 진행되어 오고 있다. 우리나라에서는 이에 대한 연구가 거의 수행되어 있지 않고 있다. 본 연구에서는 미국에서 개발되어서 사용되었던 설문항목들을 가지고 한국에서 설문조사를 한 결과이다. 미국과 한국의 문화적, 경제적 차이를 고려하여서 분석하였다. 구체적으로 본 연구에서는 노인들의 지출패턴, 제품구매 행동, 각종 시설물 이용형태, 경제적 사회봉사의 형태 등에 대하여 분석하였다. 다양한 시사점들과 앞으로의 연구방향이 제시되었다. Since the seventies, many conceptual and empirical studies about older consumers have been reported in the States. Nevertheless, there are few reported papers regarding how older consumers purchase products, what their needs are, what kinds of service facilities they like, and how they spend their money in Korea. This study presents the results of data obtained from two senior groups, one from Seoul with 206 respondents and the other from Kyungkido with 305 respondents. A couple of implications are presented on the basis of the analysis and two research directions are, also, presented.
기관지폐포세척액내 Angiotensin Converting Enzyme 의 농도에 흡연이 미치는 영향
양동호(Dong Ho Yang),한동철(Dong Chul Han),어수택(Soo Taek Uh),박춘식(Choon Sik Park) 대한내과학회 1986 대한내과학회지 Vol.31 No.1
N/A Angiotensin Converting Enzyme(ACE) is mainly synthetized by vascular endathelium and is also synthetized by human alveolar macrophage, which can be activated by smoking. To evaluate the effect of smoking on ACE production by alveolar macrophage, ACE concentration was measured in serum and bronchoalveolar lavage(BAL) fluid in 14 smokers(6 cancer, 4 tuberculosis, 4 bronchitis) and the results were compared with that in 13 non-smokers(6 cancer, 5 tuberculosis, 2 bronchitis). 1) Serum ACE concentration of tuberculosis and cancer was within normal range, but ACE concentration in BAL fluid of tuberculosis showed higher tendency than that of cancer. 2) Serum ACE concentration in smokers was not different from that of non-smokers, but the ratio of ACE to albumin in BAL fluid in smokers was significantly higher than in nonsmokers(10.01±8.90U/mg vs 2.42±1.90U/ml, p<0.005). 3) The ratio of RAL to serum-ACE to albumin ratio [BAL (ACE/alb)/serum (ACE/Alb) ] was above l.0 in all cases and significantly higher in smokers than in non-smokers(33.89±25.01 vs 14.53±15.38, P<0.025). 4) The concentration of BAL ACE per 106 of alveolar macrophages was 2.03±1.64 units in smokers and 0.77±0.92units in non-smokers(p<0.025). We conclude that ACE is actively secreted into intrabronchial lumen and smoking affects ACE production through alveolar macrophage activation.
천길정,한동철,Cheon, Gill-Jeong,Han, Dong-Chul 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.7
Applying the conjugate contact condition, contact lines of a cylindrical worm gear has been calculated. The characteristics of tooth contact were analyzed and the pitting resistance were also assessed. It has been verified that: i) the length of contact is shortest on the 1st tooth of the front region, ii) the contact region is more narrow in the recess side than in the access side, iii) the contact region is more narrow in worm than in worm wheel. Hence, the pitting resistance is weakest in the recess side of the 1st contacting worm tooth.