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이승원,배건성 한국음향학회 2002 韓國音響學會誌 Vol.21 No.5
협대역 음성부호화기에 비해 훨씬 우수한 합성음의 음질을 보이는 광대역 음성부호화기는 상대적으로 높은 전송률을 가져서 협대역 음성부호화기에 비해 사용범위가 제한되었다. 광대역 음성부호화기에서 이러한 전송 속도를 협대역 음성부호화기와 비슷한 수준으로 낮출 수 있다면, 보다 나은 음질의 음성 통신 시스템을 구현할 수 있을 것이다. 본 논문에서는 16㎑로 샘플링 된 입력 음성신호를 동일한 대역폭을 갖는 두부대역으로 분리하여, 저대역 부호화에는 유럽의 이동통신 표준안인 GSM-EFR 협대역 음성부호화기를 적용하고, 고대역 부호화에는 웨이브렛 변환을 이용하여 고안한 부대역 음성부화기를 적용한 광대역 음성부화기를 제안하였다. 제안한 음성부호화기는 저대역 신호와 고대역 신호의 부호화에 각각 12.2 kbps, 6.7 kbps의 전송 속도를 할당하여 18.9 kbps의 전송속도를 가지며, 합성음의 음질은 56 kbps의 전송속도를 갖는 G.722음성부호화기의 합성음과 비슷한 음질을 유지하였다. Wideband speech, characterized by a bandwidth of 50∼7000 ㎐, sounds more natural and intelligible, and is less tiring to listen to when compared to narrowband speech characterized by a bandwidth of 300∼3400 ㎐. Wideband speech coders, however, have not been as successful as the narrowband speech coders because of their higher bit rate. In this paper, we propose a new wideband speech coder which combines the European standard of a narrowband speech coder, i.e., GSM-EFR, and a transform coder using the discrete wavelet transform. The proposed wideband speech coder operates as follows input speech is first split into two subbands with equal bandwidth and the two subband signals are coded and decoded by each subband coder. A GSM-EFR is adopted as a lower subband coder and a subband coder with wavelet transformed speech is designed for a upper subband coder. The total bit rate of the proposed coder is 18.9kbps (12.2 kbps for lower band coder and 6.7 kbps for upper band coder), and informal listening test results have shown that the proposed coder has comparable speech quality to that of G.722 with 56 kbps.
李承遠 忠南大學校 産業技術硏究所 1986 산업기술연구논문집 Vol.1 No.1
Solubility of nitrogen in liquid iron and iron-Ni-Cr alloys has been measured by the sampling method under 1 atm N₂pressure. Results obtained are as follows ; 1. Nitrogen solubility and free energy change of nitrogen solution in liquid iron melts respectively are, log (wt % N)= -357/T -1.152 ΔG˚= 6830+22.06T J/g-atom N 2. Enthalpy change in liquid Fe-8%Ni-Cr alloys is, ΔH = 11060-2.33(wt % Cr) J/g-atom N 3. Interaction parameter in Fe-8%Ni-Cr alloy is e = -128/T+0.031
우울장애가 있는 독거노인에 대한 긍정심리 집단치료의 효과
이승원,하주원,김현수,이지희,이주영,이정애,오강섭,Lee, Seungwon,Ha, Juwon,Kim, Hyun-Soo,Lee, Jee-Hee,Lee, Ju Young,Lee, Jung-Ae,Oh, Kang Seob 대한불안의학회 2015 대한불안의학회지 Vol.11 No.1
Objective : Positive psychotherapy is based on the premise that positive thoughts and satisfaction with life are determinants for improving the symptoms of depressive disorder. This article highlights the effectiveness of group positive psychotherapy on the elderly living alone with depressive disorder in Korea. Methods : A total of 25 Korean elderly living alone with depressive disorder participated in group positive psychotherapy. The participants completed the Hamilton rating scale for depression (HAMD) and the Positive Thinking Questionnaire (PTQ) before and after the group positive psychotherapy. Results : The HAMD and PTQ scores of the participants after the group positive psychotherapy were higher than before the psychotherapy. A correlation between the age of patients and improvement of symptoms after group positive psychotherapy was found : the older the patients were, the better the improvements were. Conclusion : The study shows that group positive psychotherapy in the elderly living alone is effective in improving the symptoms of depressive disorder. The participant's age was found to be a factor that affects the improvement of depressive disorder symptoms.