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HD 음성 서비스를 제공하는 스마트폰 어플리케이션의 구현
최승환(Seung-Han Choi),김도영(Do-Young Kim),서창호(Chang-Ho Seo) 한국정보보호학회 2013 정보보호학회논문지 Vol.23 No.4
본 논문은 ITU-T 표준 코덱인 G.711.1 광대역 코덱을 적용한 HD 보이스 스마트폰 어플리케이션의 개발 내용을 설명한다. 개발 내용에는 G.711.1 광대역 코덱을 적용한 HD 보이스 스마트폰 어플리케이션의 구조와 개발된 HD보이스 어플리케이션의 음성 품질 결과를 포함하고 있으며, ITU-T의 다른 표준 코덱인 G.722 코덱을 적용한 어플리케이션 보다 음성 품질이 MOS값 ? 0.5(패킷 손실 환경 포함)로 향상된 결과가 나왔다. This paper represents the development of the HD-Voice application with G.711.1 coder-the latest wideband codec standard from ITU-T-for smartphone based on android platform. The work also includes the structure of the HD-voice application and the result of speech quality of HD-Voice application with G.711.1 coder. The paper shows that the speech quality of HD-Voice application with G.711.1 coder is excellent.
메탄올 개질 연료를 이용한 SI 엔진의 성능 및 배기배출물 특성 연구:냉시동 특성
김규보(Gyu-bo Kim),최승환(Seung-hwan Choi),김태한(Tae-han Kim),장영준(Young-june Chang),전충환(Chung-hwan Jeon) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.3
As environmental and energy concerns are forcing emission standards to tighten, it is necessary to develop low-emission vehicles, for example by modifying combustion processes, adding exhaust aftertreatments and changing fuel composition. In this experimental study, the effect of methanol-reformulated fuel by changing fuel composition on engine performance and exhaust emission characteristics for cold-start phase which is the first part of FTP 75 mode by using methanol reformulated fuel in a four-stroke DOHC 1.8L S.l. engine were studied. The results show that methanol reformulated fuel is better emission reduction of 38% and 55% over than that of net gasoline especially in HC and CO emissions at cold-start phase. But NOx emission increase about 16% than that of net gasoline<br/>
하철호(Chul-ho Ha),최승환(Seung-hwan Choi),김태한(Tae-han Kim),전충환(Chung-hwan Jeon),장영준(Young-june Chang) 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The experimental study was carried out to evaluate the characteristics of blended-fuel and transient performance of S.I. engine under cranking and accelerating modes. We compared experimentally with gasoline fuel, M30 (methanol 30%, aromatic 42%, non-aromatic 20%) and M50 (methanol 50%, aromatic 30%, non-aromatic 20%) for performance and exhaust gas.<br/> The results show that stabilized time of blended-fuels is better than that of gasoline fuel especially HC and CO exhaust gas. Especially HC emission can be reduced to 84.3% in M30 and 48.8% in M50 respectively. And the accelerating performance coincides with the results of distillation curve and CO concentration for M50 varies little in the condition of slow acceleration.