• Journal of Korea Multimedia Society
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• v.10 no.9
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• pp.1209-1219
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• 2007

It is difficult to run 3D graphics based application on the embedded system with hardware constraints. Therefore, such a system must have a systematic infrastructure which can process various operations with respect to 3D graphics through any graphic acceleration module. In this paper, we present a method to implement 3D graphics acceleration device driver on Tiny X platform which provide an open source graphics windowing environment. The proposed method is to initialize the driver step by step so that the direct rendering infrastructure can use it properly. Moreover, we evaluated overall 3D graphics performance of an implemented driver through a simple but effective benchmark program.

• The Journal of Korea Robotics Society
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• v.16 no.3
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• pp.260-269
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• 2021

To verify performance or conduct experiments using actual robots, a lot of costs are needed such as robot hardware, experimental space, and time. Therefore, a simulation environment is an essential tool in robotics research. In this paper, we develop the HUMIC simulator using ROS and Gazebo. HUMIC is a humanoid robot, which is developed by HCIR Lab., for human-robot interaction and an upper body of HUMIC is similar to humans with a head, body, waist, arms, and hands. The Gazebo is an open-source three-dimensional robot simulator that provides the ability to simulate robots accurately and efficiently along with simulated indoor and outdoor environments. We develop a GUI for users to easily simulate and manipulate the HUMIC simulator. Moreover, we open the developed HUMIC simulator and GUI for other robotics researchers to use. We test the developed HUMIC simulator for object detection and reinforcement learning-based navigation tasks successfully. As a further study, we plan to develop robot behavior intelligence based on reinforcement learning algorithms using the developed simulator, and then apply it to the real robot.

• Journal of Korea Society of Digital Industry and Information Management
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• v.18 no.1
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• pp.11-24
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• 2022

Open Radio Access Network (O-RAN) standard has been proposed to separate the baseband signal processing unit from the Radio Frequency (RF) unit at base station system mainly for reducing the cost of base station systems through open-source interfaces between the two units. To satisfy the performance metrics in various scenarios, several fronthaul functional split options were presented by O-RAN. Amongst these options, the split option 7-2x is widely adopted in practical applications due to its excellent trade-off between the required bandwidth and RU overhead. In this paper, we present a hardware implementation of a base station system that is compliant with the Category B of O-RAN split option 7-2x. It consists of O-DU and O-RU implemented with a commercial off-the-shelf Digital Signal Processor and RF transceiver, respectively. The performance of the proposed base station system is evaluated in terms of Bit Error Rate and received signal power as well as the required fronthaul bandwidth. Through various experimental tests, we have observed that the proposed system reduces the fronthaul bandwidth nearly by 89.7% compared to the conventional system that dose not employ the O-RAN standard.

• Asian Journal of Innovation and Policy
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• v.4 no.3
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• pp.271-287
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• 2015

Universities are now operating in a post-globalized world. They need to be locally engaged while globally visible for continued success. Specific strategies include 1) unbundling education using fractal modules approach to facilitate more flexible and customized learning expectations of net generation of students; 2) open-source software and hardware platforms to facilitate collaborations around a short or multi-year, multidisciplinary brain stretching projects motivated by the real world challenges; 3) new courses on innovation and entrepreneurship to nurture experience seeking and enterprising mindset of students; 4) cross-border university- public- private partnerships for developing solutions specific to the local needs and can be scalable for the world; and 5) encouraging faculty members with glocal mindset.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.63 no.3
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• pp.206-211
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• 2014

In this Paper, We proposed the HLS(Http Live Streaming) transmitter which is operated easily and cheap in all networks and client environments compared to the exist video live streaming transmitter. We analyzed the HLS protocol and then implemented for making the HLS transmitter cheaper and portable. After designing the HLS transmitter hardware using the RISC processor of Arm11 core, we ported the Linux Operating System and implemented the HLS protocol using the open source FFmpeg and Segmenter. For the performance evaluation of the developed HLS transmitter, we made the testing environment which is including the notebook, iPhone, and aroid Phone. In this testing environment, we analysed the received video data at the client displayer. As a results of the performance evaluation, we could certify that the proposed HLS transmitter has a higher performance than the Apple company's HLS.

• Journal of Institute of Control, Robotics and Systems
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• v.10 no.4
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• pp.334-340
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• 2004

In this paper, a Web-based management system for the building network is described. A multi-protocol converter based on SoC and embedded Linux is designed. The open source licensing, reliability, and broad hardware support are key reasons for use of embedded Linux in embedded industry. The multi-protocol converter integrates control network of RS-485 and LonWorks devices through TCP/IP protocol for a client with Java applet. The system consists of three-tier architecture, such as a client, a server that is performed on a multi-protocol converter, and control devices. The developed system includes the inverter motor control system with modbus protocol for the RS-485 network. The experiment results show that the multi-protocol converter using embedded Linux is a flexible and effective way to builda Web -based monitoring and control system.

• IEIE Transactions on Smart Processing and Computing
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• v.5 no.4
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• pp.289-293
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• 2016

As more mobile devices are equipped with multi-core CPUs and are required to execute many compute-intensive multimedia applications, it is important to optimize the systems, considering the underlying parallel hardware architecture. In this paper, we implement and optimize ray-tracing application tailored to a given mobile computing platform with multiple heterogeneous processing elements. In this paper, a lightweight ray-tracing application is specified and implemented in Kahn process network (KPN) model-of-computation, which is known to be suitable for the description of real-time applications. We take an open-source C/C++ implementation of ray-tracing and adapt it to KPN description in the Distributed Application Layer framework. Then, several possible configurations are evaluated in the target mobile computing platform (Exynos 5422), where eight heterogeneous ARM cores are integrated. We derive the optimal degree of parallelism and a suitable distribution of the replicated tasks tailored to the target architecture.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.123-125
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• 2012

임베디드 소프트웨어에서의 테스팅은 하드웨어에 의존도가 높기 때문에 일반적인 소프트웨어에서의 테스팅과 달리 다양한 테스트 기법과 도구를 활용한 기술 집약적 테스트가 미약하고, 다른 펌웨어에서 테스팅 할 경우 테스팅이 제대로 되지 않는다. 본 논문에서는 하드웨어 의존도가 높은 임베디드 소프트웨어의 모듈을 펌웨어가 다른 x86의 환경에서 테스팅 할 수 있도록, 레지스터, 포트 등을 참조하는 부분을 로그로 출력하고, 모듈끼리의 의존성이 없도록 소스 코드를 수정하여, 공개 소스 테스팅 도구를 활용하여 단위 테스트 할 수 있도록 하였다.

• Journal of Information Processing Systems
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• v.8 no.1
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• pp.101-118
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• 2012

Embedded products are becoming richer in features. Simulation tools facilitate low-costs and the efficient development of embedded systems. SID is an open source simulation software that includes a library of components for modeling hardware and software components. SID components were originally written using C/C++ and Tcl/Tk. Tcl/Tk has mainly been used for GUI simulation in the SID system. However, Tcl/Tk components are hampered by low performance, and GUI development using Tcl/Tk also has poor flexibility. Therefore, it would be desirable to use a more advanced programming language, such as Java, to provide simulations of cutting-edge products with rich graphics. Here, we describe the development of the Java Bridge Module as a middleware that will enable the use of Java Components in SID. We also extended the low-level SID API to Java. In addition, we have added classes that contain default implementations of the API. These classes are intended to ensure the compatibility and simplicity of SID components in Java.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.990-993
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• 2016

본 논문에서는 사물인터넷 기반의 홈/사무실을 구현하기 위해 사용자 등급, 사용자의 실내/외 구분을 통한 지능형 도어락을 소개한다. 도어락을 제어하기 위하여 오픈 소스 하드웨어인 '가상오브젝트 기반의 게이트웨이 라즈베리파이'와 '통합 컨트롤러 플랫폼 아두이노'를 이용하였으며 모바일 플랫폼으로는 안드로이드 스마트폰을 이용하였다. 본 지능형 도어락은 모바일 어플리케이션을 통해 문개/폐, 이력 조회, 실시간 영상 조회를 할 수 있으며, 사용자의 등급을 Owner(주인)와 Guest(손님)으로 나누어 도어락 제어의 제한을 두는 지능적인 도어락이다.