• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2005.11a
• /
• pp.493-496
• /
• 2005

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.

• 한국HCI학회:학술대회논문집
• /
• 2007.02a
• /
• pp.828-834
• /
• 2007

Lately the usage of multimedia equipment with small LCD displays is rapidly increasing. Although many people use devices like cell phone and PDA, videos intended for TV or HDTV are sent to these mobile devices. Therefore, situation where it is hard for the user to view the desired scenes are growing more frequent. Currently, most services simply reduce the size of the content to fit the screen when they offer it for mobile devices. However, especially with sports broadcasts, there are many areas that cannot be seen very well because it was simply reduced in size. We are suggesting new motion how to let the user choose an area of interest based on Cognitive lattice. And present then sending it to the user in a way based on Focus Of Choice that fits the device.

• Journal of the Korea Society of Computer and Information
• /
• v.12 no.2 s.46
• /
• pp.209-220
• /
• 2007

Mobile devices become a pak of our daily life due to their versatility, such as the wireless phone calls, the wireless accessibility to Internet, the display of multimedia content, and the communication with nearby mobile devices. Third generation telecommunication service provides an easy access to the Internet for nubile devices. Mobile users pay a fee charged by the telecommunication provider based on the amount of data transferred. This paper introduces a special ad hoc network in which mobile devices cooperate each other to download an interesting content from the Internet in order to reduce the telecommunication cost. The mobile devices, called the peers, in the ad hoc network are assigned a portion of the target file, and are responsible for downloading the portion using their 3G connection. Then, the peers exchange their downloaded portion with other participating peers using their cost-free ad hoc connection in order to reconstruct the whole content. According to the simulation results, large number of participating peers saves the telecommunication cost up to 90% with as few as 10 peers, although it slightly increase the overall content reconstruction time.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2002.11b
• /
• pp.617-621
• /
• 2002

현재 잘 갖추어진 정보통신 인프라에서 이동통신사들이 제공하는 서비스들이 각기 다른 무선 마크업 언어를 사용하고 있어 하나의 컨텐츠를 제공하기 위해서는 각 이동통신사별로 별도의 추가 개발이 이루어져야 하는 등 서비스 발전에 장애 요인이 존재한다. 본 연구에서는 이러한 국내외 무선 인터넷의 현실을 고려하여 무선 인터넷 컨텐츠의 생산성 향상 또는 서비스의 질적 향상을 위하여 유무선 인터넷 컨텐츠들을 이동 단말기들에 적합하도록 변환 작성하여 전송해주는 프럭시(proxy)를 개발하였다. 본 연구의 특징은 metaXML로 정의된 중간 언어를 채택하여 서로 다른 마크업 언어로 작성된 컨텐츠들을 효과적으로 변환할 수 있다.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2003.11b
• /
• pp.778-781
• /
• 2003

모바일 단말기의 수요가 급격히 증가하면서, 모바일 단말기를 이용한 비즈니스 모델의 개발이 활발히 이루어지고 있으며, 다양한 비즈니스 모델만금이나 기존 컨텐츠를 재활용하는 측면도 강조 되여지고있다 현재의 모바일 인터넷 서비스를 제공하는 업체들은 유선에서 사용되는 정보와 별도로 무선인터넷에서 이용 가능한 싸이트를 따로 구축하여 서비스를 제공하는데, 기존의 이러한 방식은 자원의 중복을 초래하기 때문에 매우 비효율적이라 할수있다. 본 논문은 이러한 일련의 문제점들을 해결하는 한 방법으로 기존의 HTML로 구성된 웹페이지를 모바일 단말기에서 활용가능한 WML로 변환 되여지는 변환기를 설계 및 구현함으로써 무선 컨덴츠 개발의 생산성을 향상시키는 방법을 보여준다.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2012.05a
• /
• pp.106-107
• /
• 2012

기존의 소셜커머스는 제공되는 할인정보를 사용자가 직접 찾아야 하는 불편함이 있다. 최근 소셜커머스가 모바일 애플리케이션(이하 앱) 시장에 진출하면서 GPS 기술을 활용한 서비스를 제공하고 있다. 본 연구에서는 이러한 점에 착안해 소셜커머스에 GPS 기술과 나아가 할인정보 자동 알림 기능을 접목시킨 모바일 앱을 구현하고자 한다.

• Journal of Korea Multimedia Society
• /
• v.17 no.3
• /
• pp.324-332
• /
• 2014

This paper presents a programmable System-On-a-chip for various embedded applications that need Neural Network computations. The system is fully implemented into Field-Programmable Gate Array (FPGA) based prototyping platform. The SoC consists of an embedded processor core and a reconfigurable hardware accelerator for neural computations. The performance of the SoC is evaluated using real image processing applications, such as optical character recognition (OCR) system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2006.05a
• /
• pp.765-768
• /
• 2006

Processsive ubiquitous networks have impressed us with alternative features, divesity or security. When the diversity from small devices to large machines is in normal states, ubiquitous networks are fundamental and useful. We have developed a mobile processor dedicated to multimedia cryptography. We have focus on the multimedia cryptography by the dedicated processor.

• Journal of KIISE:Computing Practices and Letters
• /
• v.13 no.3
• /
• pp.165-178
• /
• 2007

The recent progress in multimedia signal processing and transmission technologies has contributed to the extensive use of multimedia devices to watch sports games with small LCD panel. However, the most of video sequences are captured for normal viewing on standard TV or HDTV, for cost reasons, merely resized and delivered without additional editing. This may give the small-display-viewers uncomfortable experiences in understanding what is happening in a scene. For instance, in a soccer video sequence taken by a long-shot camera techniques, the tiny objects (e.g., soccer ball and players) may not be clearly viewed on the small LCD panel. Moreover, it is also difficult to recognize the contents of the scorebox which contains the elapsed time and scores. This renuires intelligent display technique to provide small-display-viewers with better experience. To this end, one of the key technologies is to determine region of interest (ROI) and display the magnified ROI on the screen, where ROI is a part of the scene that viewers pay more attention to than other regions. Examples include a region surrounding a ball in long-shot and a scorebox located in the comer of each frame. In this paper, we propose a scheme for raising viewing experiences of multimedia mobile device users. Instead of taking generic approaches utilizing visually salient features for extraction of ROI in a scene, we take domain-specific approach to exploit unique attributes of the soccer video. The proposed scheme consists of two modules: ROI determination and scorebox extraction. The experimental results show that the proposed scheme offers useful tools for intelligent video display on multimedia mobile devices.

• Journal of Information Processing Systems
• /
• v.13 no.3
• /
• pp.546-558
• /
• 2017

The amount of multimedia traffic over the Internet has been increasing because of the development of networks and mobile devices. Accordingly, studies on multicast, which is used to provide efficient multimedia and video services, have been conducted. In particular, studies on centralized multicast tree construction have attracted attention with the advent of software-defined networking. Among the centralized multicast tree construction algorithms, the group Takahashi and Matsuyama (GTM) algorithm is the most commonly used in multiple multicast tree construction. However, the GTM algorithm considers only the network-cost overhead when constructing multicast trees; it does not consider the temporary service disruption that arises from a link change for users receiving an existing service. Therefore, in this study, we propose a multiple multicast tree construction algorithm that can reduce network cost while avoiding considerable degradation of service quality to users. This is accomplished by considering both network-cost and link-change overhead of users. Experimental results reveal that, compared to the GTM algorithm, the proposed algorithm significantly improves the user-experienced quality of service by substantially reducing the number of linkchanged users while only slightly adding to the network-cost overhead.