• ETRI Journal
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• v.35 no.1
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• pp.27-34
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• 2013

This paper proposes a network-adaptive mechanism for HTTP-based video streaming over wireless/mobile networks. To provide adaptive video streaming over wireless/mobile networks, the proposed mechanism consists of a throughput estimation scheme in the time-variant wireless network environment and a video rate selection algorithm used to increase the streaming quality. The adaptive video streaming system with proposed modules is implemented using an open source multimedia framework and is validated over emulated wireless/mobile networks. The emulator helps to model and emulate network conditions based on data collected from actual experiments. The experiment results show that the proposed mechanism provides higher video quality than the existing system provides and a rate of video streaming almost void of freezing.

• Spatial Information Research
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• v.4 no.1
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• pp.75-81
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• 1996

Realty Trade Information Hanagement System(RTIMS) is intended to provide the services relat¬ed to realty business activity such as registration, search, negotiation, and information analysis. Introduction of the geographic information processing concept into the system has a great effect on the overall service processes of the realty business. This system is designed and implemented for remote users to easily get the informations about the target realty and to achieve a proper negotiation, by offering the various kinds of geographic informations including map, moving picture, photo, and so on. Futher, users can access RTIMS through WWW(World Wide Web) without additional client emulator.

• IEMEK Journal of Embedded Systems and Applications
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• v.8 no.6
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• pp.303-309
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• 2013

Cloud storage services are used for efficient sharing or synchronizing of user's data across multiple mobile devices. Although cloud storages provide flexibility and scalability in storing data, security issues should be handled. Currently, typical cloud storage services offer data encryption for security purpose but we think such method is not secure enough because managing encryption keys by software and identifying users by simple ID and password are main defectives of current cloud storage services. We propose a secure data access method to cloud storage in mobile environment. Our framework supports hardware-based key management, attestation on the client software integrity, and secure key sharing across the multiple devices. We implemented our prototype using ARM TrustZone and TPM Emulator which is running on secure world of the TrustZone environment.

• Proceedings of the IEEK Conference
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• 2003.07d
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• pp.1327-1330
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• 2003

The internet SCSI(iSCSI) disk has been studied as a storage system which can be directly connected to TCP/IP network. We designed and implemented a shared disk following the iSCSI protocol and providing cache consistency. It is named as intelligent iSCSI(i$^2$SCSI) disk. The i$^2$SCSI disk provides cache consistency of all blocks that belong to the disk using a conventional lease method and it uses 'contiguous blocks-level locking' The prototype of the i$^2$SCSI disk emulator and its client is designed and implemented in Linux 2.4.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.36 no.5
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• pp.367-376
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• 1987

In this paper we have disigned and implemented a real time ALE (adaptive line enhancer) using a high speed digital processor,NEC 7720. For the ALE system, we have employed an adaptive LMS(least mean square) algorithm proposed by Widrow and Hoff and a 32-order FIR(finite impulse response) filter. Extensive computer simulations have been performed to investigate the peformance of the ALE and to determine necessary parameters for hardware design. The developed software for an NEC 7720 was tested in real time operation using an NEC7720 hardware emulator. The ALE has been tested by sinusoidal waves and real CW (continuous wave) signals. It was found that the experimental results were well agreed with the computer simulation results. Thus it can be concluded that the ALE is useful for detection and enhancement of a sinusoidal signal which is corrupted by an additive Gaussian noise.

• 제어로봇시스템학회:학술대회논문집
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• 1993.10b
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• pp.378-384
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• 1993

In this paper, an intelligent adaptive controller is proposed for the process with unmodelled dynamics. The intelligent adaptive controller consists of the numeric adaptive controller and the intelligent tuning part. The continuous scheme is used for the numeric adaptive controller to avoid the problems occurred in the discrete time schemes. The adaptive controller is adopted to the process with time delay. It is an implicit adaptive algorithm based on GMV using the emulator. The tuning part changes the design parameters in the control algorithm. It is a multilayer neural network trained by robustness analysis data. The proposed method can improve the robustness of the adaptive control system because the design parameters are tuned according to the operating points of the process. Through the simulation, robustnesses are shown for intelligent adaptive controller. Finally, the proposed algorithms are implemented on the electric furnace temperature control system. The effectiveness of the proposed algorithm is shown from experiments.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2005.11a
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• pp.135-138
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• 2005

Java Virtual Machine이 기반이 되는 플랫폼 사용으로 모바일 폰 Java는 C/C++로 컴파일 된 Binary File에 비해 속도가 떨어지고 고성능의 프로세서를 필요로 하기 때문에 가격이 비싸질 수밖에 없다. Native Binary를 사용하는 Nano-X Window System Graphic Engine은 저 사양 프로세서에서 사용가능한 모바일 플랫폼으로써 Java Virtual Machine 보다 빠른 속도를 구현할 수 있고 GPL License를 따르기 때문에 생산단가도 절약할 수 있어 저가형 핸드폰의 대량 생산으로 인해 현재 떠오르고 있는 신흥시장에서 보다 경쟁력을 높일 수 있을 것으로 기대된다. 본 논문에서는 기존의 모바일 플랫폼과 Nano-X window System을 비교해보고 모바일 플랫폼으로써의 개발 방향에 대해 논해 보려 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.06a
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• pp.317-320
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• 2016

한국정보통신기술협회(이하, TTA)에서 제정된 " HTML5 기반 스마트 TV 플랫폼(TTAK.KO-07.0111/R1)" 은 개방형 국제 기술표준인 W3C/HTML5 을 기반으로 스마트 TV 에서 방송환경과 운영체제에 종속되지 않고 애플리케이션이 실행될 수 있도록 스마트 TV 플랫폼의 기술 요구 사항을 정의한 표준이다. TTA 에서는 이러한 표준 기반의 TV 앱 생태계를 활성화하기 위해 앱 개발도구(SDK)를 개발하여 배포하였고, 이어서 TV 장치 없이 PC 환경에서 표준 기반으로 개발된 앱을 실행할 수 있는 있는 에뮬레이터 개발을 추진하였다. 개발된 에뮬레이터는 사용자의 방송 정보 설정을 바탕으로 방송 재생 및 제어 기능을 제공하고 표준 기술로 작성된 앱을 방송 연동형 혹은 패키지 형태로 실행할 수 있는 기능을 제공한다. 본 논문에서는 TTA 에서 개발한 표준 기반 TV 에뮬레이터의 설계 및 구현에 대해 소개한다.

• The Journal of the Acoustical Society of Korea
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• v.8 no.5
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• pp.95-101
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• 1989

For developing new algorithms or dedicated hardware by using general purpose Digital Signal Processor chip, emulator H/W and simulator S/W are indispensible. But the most of DSP emulators have limitations on H/W flexibility according to their generalized architectures. In this paper, a DSP evaluation system for real time signal processing was developed using TMS 32020. The I/O buffers storing acquisition data of the system were designed to have variable length $(1\sim2048samp1es) &$ sampling frequency $l00\sim8KHz$.

• Journal of Multimedia Information System
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• v.7 no.2
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• pp.107-114
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• 2020

This paper proposes a wearable audio book application using two wearable devices, a smartwatch and a hearables. We review requirements of what could be a killer wearable application and design our application based on these elicited requirements. To distinguish our application, we present 7 scenarios and introduce several wearable interaction modalities. To show feasibility of our approach, we design and implement our proof-of-concept prototype on Android emulator as well as on a commercial smartwatch. We thoroughly address how different interaction modalities are designed and implemented in the Android platform. Lastly, we show latency of the multi-modal and alternative interaction modalities that can be gracefully handled in wearable audio application use cases.