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황건용(Hwang, Gun-Yong),황상문(Hwang, Sang-Moon),권중학(Kwon, Joong-Hak),김광석(Kim, Kwang-Seok),이홍주(Lee, Hong-Joo) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.10
With the growth in electronics and the remarkable advance in wireless communication technology, mobile devices, such as mobile phones and PDAs are incessantly improved in their diverse functional performance. Lighter weight and smaller size has been gradually accomplished by recent circuit integration technology resulting in rapid growth in the number of mobile phone subscribers. Driven by customer demand, recent mobile devices are fully capable of realizing a variety of dazzling multimedia effects powered by electro-acoustic parts that have become one of the generic components. However, This paper also presents an oval micro-speaker, that is' expected to show an excellent performance within limited space of mobile phone, and its performance design has been suggested as well. Finally, a statistical approach to achieve high characteristic and performance is suggested by Taguchi method to identify a certain relationship between a mobile phone and a micro-speaker.
이동통신 단말기용 통합 영구 자석 형태의 마이크로스피커 개발
황상문(Hwang, Sang-Moon),이홍주(Lee, Hong-Joo),권중학(Kwon, Joong-Hak),황건용(Hwang, Gun-Yong),양용창(Yang, Yong-Chang) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.2
In mobile phones of multimedia era, microspeakers of high qualify sound are essential parts to generate human voice in speaker phone and MP3 song player. In this paper, two types of microspeakers, outer permanent magnet (PM) and combined PM type, are analyzed using electromagnetic, mechanical and their coupling analysis. For performance comparison, voice coil diameter is chosen as a design parameter to change excitation position and magnet volume for both types. For combined PM type, sound pressure level (SPL) is improved due to increased PM volume compared to outer PM type. Also, with the decreased voice coil diameter for combined PM type, the 1st resonant mode of the diaphragm is more efficiently excited due to concentrative excitation, resulting in lower and broader frequency range. Therefore, it can be said that the combined PM type microspeakers are more advantageous for high performance microspeaker which are essential for multimedia era.
중소 제조업의 융합모형 설계에 따른 핵심성과지표 적용 사례
박국제(Kook-Je Park),이운식(Woon-Seek Lee),황건용(Gun-Yong Hwang) 한국산업경영시스템학회 2008 한국산업경영시스템학회지 Vol.31 No.1
It is important to manage quality and safety of a product for coping with fast-paced world effectively. This paper demonstrates an integrated model between ISO 9001 Quality Management System and Product Safety Management System. And the paper presents a method which decides key performance indicators (KPI) to be concentrated on the effectiveness of system operation. A case study shows an process for industry to implement the developed methodology.