• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.1371-1374
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• 2006

센서 네트워크는 관찰 지역 내의 정보를 수집하는 센서 노드들로 구성된다. 센서 노드는 제한된 용량의 배터리를 갖고 동작하므로 센서 노드의 배터리 파워를 효과적으로 사용하여 최대한 센서 노드의 수명을 길게 하는 것이 센서 네트워크의 중요한 고려사항 중의 하나이다. 센서 네트워크에서 사용되는 운영체제들은 이를 위해 대부분 저전력 모드를 고려하여 설계된다. 무선 임베디드 센서 네트워크를 위해 설계된 운영체제인 TinyOS도 간단하며 강력한 전력관리 기법을 제공한다. 그러나 TinyOS에서 제공하는 전력관리 기법은 마이크로컨트롤러 자체의 저전력 모드를 고려하지 않아서 마이크로컨트롤러가 제공하는 저전력 모드를 실제로 충분히 사용할 수 없다. 본 논문에서는 TinyOS에서 마이크로컨트롤러의 저전력 모드를 충분히 활용할 수 있도록 개선하여 보다 향상된 전력관리 기법을 제안한다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.938-939
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• 2008

Embedded OS is used widely in many case of today's systems. Using of Embedded OS for IED(Intelligent electronic device) is vary useful method of the processing of complex operations. In this paper, we designed embedded OS module for use as a more effective way in IED systems.

• Journal of Korea Society of Digital Industry and Information Management
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• v.6 no.4
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• pp.143-151
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• 2010

In this paper, We designed the robot controller with Linux OS, Cygwin under the Marvell Monahan PXA320 embedded platform. Cygwin is a collection of tools for using the Linux-like environment for commercially released x86 32 bit and 64 bit versions of Windows and is a DLL that acts as a Linux API emulation layer providing substantial Linux API functionality. TinyOS-2. x is a component based embedded OS by UC Berkeley and is an open-source OS designed for interfacing the sensor application with specific C-language. The results of experiment are described to show the improvement of sensor interfacing functionality under the PXA320 embedded RTOS platform.

• Proceedings of the Korean Society of Computer Information Conference
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• 2012.07a
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• pp.331-334
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• 2012

최근 모바일 임베디드 단말기에서는 iOS나 안드로이드와 같이 다양한 S/W 플랫폼들이 경쟁을 하고 있다. 이에 반해 전통적인 리눅스 기반 임베디드 단말기의 경우 busybox에서 제공하는 기본 명령어 외에는 필요한 Application 및 라이브러리를 모두 빌드하여 사용하였다. 하지만 PC에서는 범용적인 리눅스 배포판을 사용하여 필요한 Application이나 라이브러리를 패키지 메니져를 통해 쉽게 설치가 가능하다. 이에 따라 임베디드 단말기에서도 범용 리눅스 배포판을 설치하여 PC 에서와 같은 장점을 취하려는 방법들이 개발되는 추세이다. 본 논문에서는 현재 개발된 방법들을 비교 분석 해보고, 앞으로 개선해야 할 사항들을 도출하고자 한다.

• IEMEK Journal of Embedded Systems and Applications
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• v.8 no.1
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• pp.11-16
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• 2013

With the development and general use of a variety of Android/iOS-based smart phones and smart pads, the existing e-learning contents need to be changed in such a way that they can be carried out on different smart device platforms. This paper shows what changes are needed for that aim, and, in particular, for the compatibility of different platforms by designing and implementing Android/iOS-based smart learning contents in the form of a hybrid app. This paper will hopefully help you consider what elements are required to develop smart-learning contents on a variety of platforms for mobile devices.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.7-8
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• 2017

최근 ARM 프로세서의 가상화 확장 기술을 이용하는 임베디드 시스템에서 다종의 OS 작동을 지원하는 하이퍼바이저가 많이 개발되었다. 가상화 기술은 하드웨어 자원을 효과적으로 사용한다는 이점이 있지만, RTOS를 작동시킬 경우 하이퍼바이저의 오버헤드에 의해 RTOS의 성능이 저하될 수 있는 문제가 발생한다. 본 논문에서는 가상화 기술을 지원하는 ARMv7 Cortex-A15 프로세서를 탑재한 NVidia Jetson TK-1 임베디드 보드에서 RTOS가 단독으로 작동했을 때의 성능과 QPlus Hypervisor를 통해 Linux OS와 함께 RTOS가 작동했을 때의 성능을 측정하고 비교 분석 하였다.

• IEMEK Journal of Embedded Systems and Applications
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• v.13 no.3
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• pp.117-124
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• 2018

Wearable devices have become widespread. Fitness band is one of common wearable devices, providing useful functions. It helps users to monitor and collect their status such as heart rate and travel distance. Wearable devices, including fitness bands, are designed in small size and it ends up having small battery capacity. In that regard, it is necessary to expand the lifetime of wearable devices. Conventional power management scheme of wearable devices is based on DVFS Ondemand Governor and peripheral control by timeout event, such as turning off the LCD. In this paper, we propose a hybrid governor applying hardware supporting low power mode such as sleep mode to exploit the periodicity of fitness band task. In addition, we show hybrid governor outperforms in power consumption than conventional power management scheme of wearable devices based on Ondemand Governor through experiments.

• IEMEK Journal of Embedded Systems and Applications
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• v.3 no.1
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• pp.30-33
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• 2008

This paper persents how to port HAL (Handset Abstraction Layer) on embedded Linux to support WIPI (Wireless Internet Platform for Interoperability). As smart phones are widespread nowdays, the operating system is changing from a simple kernel like Qualcomm REX OS to more feature-rich Linux kernel. For this reason, we investigate the internal structure of HAL on REX OS and design how to port it to embedded Linux. Careful analysis leads us to identify several porting issues such as thread support, graphical user interface. In addition, we describe some problems discovered during the implementation process and propose alternative architecture of HAL for WIPI on Linux.

• IEMEK Journal of Embedded Systems and Applications
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• v.5 no.4
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• pp.225-233
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• 2010

In this paper, we try to improve the performance of the demand paging loader suggested to use the demand paging way that is not based on operating system. The demand paging switching strategy used in the existing operating system can know the recently used pages by running multi-processing. Then, based on it, some page switching strategies have been made for the recently used pages or the frequently demanded pages. However, the strategies based on operating system cannot be applied in single processing that is not based on operating system because any context switching never occur on the single processing. So, this paper is trying to suggest the demand paging switching strategies that can be applied in paging loader running in single process. In the Return-Prediction-Algorithm, we saw the improved performance in the program that the function call occurred frequently in a long distance. And then, in the Most-Frequently-Used-Page-Remain-Algorithm, we saw the improved performance in the program that the references frequently occurred for the particular pages. Likewise, it had an enormous effect on keeping the memory reduction performance by the demand paging and reducing the running time delay at the same time.

• Journal of the Korea Society of Computer and Information
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• v.13 no.3
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• pp.45-55
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• 2008

Due to the increasing complexity of embedded system design, automatic code generation of embedded software and hardware-software co-design methodologies are gaining great interest from industries and academia. Such an automatic design methodologies are always demanding a formal system specification languages for defining designer's idea clearly and precisely. In this paper, we propose automatic embedded C code generation from SDL (Specification and Description Language, ITU-T recommended the SDL as a standard system description language) with considering a real-time uC/OS-II operating system. Our automatic embedded C code generator is expected to provide a fast specification, verification and performance evaluation platform for embedded software designs.