• Journal of Internet Computing and Services
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• v.7 no.2
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• pp.121-136
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• 2006

Software architecture and protocols to be maintained between components for the reconfigurable SDR system is analyzed and suggest system design idea for the implementation of software. To do this, related surveys are reviews and set up the system model with the structure of embedded system. SDR system architecture is suggested with five layered structure, consisted with hardware, operating system, middle-ware, service objects and application layer. SDR system is designed to be work on the basis of Linux operating system, and aimed to be scalable and reconfigurable. It is introduced the design result of software protocol and state transition diagram for the implementations of software download function which is the most important feature in SDR.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.6
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• pp.1429-1434
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• 2010

Generally, the simulator for mobile device tests automatically an application software after instilling again the event, which is saved in log file according to an event generation sequence, into the application software of device. But, the simulator performance for mobile device can be different according to a extraction layer even if the events are same. And, the sequence of events extracted from an application is changeable in the environment that multiple applications are operated concurrently. Therefore, even though the same applications is executed to the same sequence, the generation sequence of events is revised in accordance with the state of mobile device system, and whether the errors occur according to circumstances or not. This kind of application software error is very difficult to perform a debugging operation. In this paper, the execution state of various applications is verifiable through the re-editing of events after analyzing the events which is generated in application, kernel, middleware layer, and the event arrange/editor is designed and implemented to understand efficiently the influence on application, kernel, and middleware layer for events.

• The Journal of Information Technology
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• v.5 no.1
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• pp.69-77
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• 2002

The Bluetooth is expected to be one of the most popular wireless telecommunication technology in the near future, and the protocol stack is essential to providing the various services with the Bluetooth-embedding systems or devices. The Bluetooth specification is an open, global specification defining the complete system, however, the protocol stack is usually implemented partly in hardware and partly as software running on its system, with different implementations partitioning the functionality between hardware and software in different ways. I investigate how to design and implement the Bluetooth protocol stack according to its specification. I focus on the HCI and the lower layer of the software protocol stack as a basic step for the development of our own protocol stack. As a result, paper provides how to partitioning the role of HCI layer, and how to implement the relationship between HCI packets, it's functionality and the flow control. Experiments show the discovering other Bluetooth devices and their connection. Furthermore experiments demonstrate the proper operation of data communication between the Bluetooth modules.

• IEMEK Journal of Embedded Systems and Applications
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• v.2 no.4
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• pp.242-250
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• 2007

Wireless sensor networks are subject to highly heterogeneous system requirements in terms of their functionality and performance due to their broad application areas. Though the heterogeneity hinders the opportunity of developing a single universal platform for sensor networks, efforts to provide uniform, inter-operable and scalable ones for sensor networks are still essential for the growth of the industry as well as their technological advance. As a part of our work to develop such a robust platform, this paper presents the software architecture for sensor nodes with focus on our sensor node operating system and its configuration methodology. Addressing principle issues in its design space which includes programming, execution, task scheduling and software layer models, our architecture is highly reconfigurable with respect to system resources and functional requirements and also highly efficient in supporting multi-threading under small system resources.

• JSTS:Journal of Semiconductor Technology and Science
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• v.5 no.4
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• pp.243-248
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• 2005

The UAV (Unmanned Aerial Vehicle) systems like unmanned autonomous helicopters are used in various missions of flight navigation and used to collect the environmental information of the surroundings. To realize the full functionalities of the UAV, the software part becomes a challenging problem. In this paper embedded real-time software architecture for unmanned autonomous helicopter is proposed that guarantee real-time performance of hard-real time tasks and re-configurability of soft-real time and non-real time tasks. The proposed software architecture has four layers: hardware, execution, service agent and remote user interface layer according to the reactiveness level for external events. In addition, the layered separation of concurrent tasks makes different kinds of mission reconfiguration possible in the system. An Unmanned autonomous helicopter system was implemented (Kyosho RC Helicopter) in our lab to test and evaluate the performance of the proposed system.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.778-780
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• 2019

본 논문은 네트워크 트래픽에 대한 동적인 변화에 대응하기위해 기존의 네트워크 트래픽 데이터를 이용하여 기계 학습을 사용하여 학습시킴으로써 이후 네트워크 트래픽 동향에 대해 분류하여 예측하는 연구에 관한 논문으로, 기계 학습의 종류 중 MLP(Multi-Layer Perceptron)를 이용하여 실험하였는데 MLP 의 구조와 학습 반복 횟수에 따른 정확도의 차이와 테스트 데이터 실험 결과를 정리하였다. 또한 이를 통해 얻어진 결과는 어떻게 사용 될 지와 정확도를 높이기 위해서는 어떤 요소가 영향을 끼치는지에 대해 논문의 방식과 비교하여 설명한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1575-1577
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• 2012

비즈니스 프로세스 프레임워크(Business Process Framework) 레이어 모델링 정보를 레파지토리에 저장하기위해서는 BPF 5-레이어의 복잡한 구조를 수작업으로 분석해야하는 어려움이 있다. 그래서 각 레이어 모델링 정보를 레파지토리에 효율적으로 저장하기 위해 비즈니스 프로세스 프레임워크 5-레이어 정보 메타모델을 제안한다. 제안한 메타모델 기반으로 레이어 정보를 모델링한다. 모델링된 레이어 정보를 모델변환하여 XMI(XML Metadata Interchange)로 변환하고 그 데이터를 레파지토리에 저장한다. 이 방법을 통해 레이어 정보를 모델링하고, XMI로 변환하면 정보를 쉽고 효율적으로 레파지토리에 저장이 가능하다.

• Information and Communications Magazine
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• v.19 no.11
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• pp.70-84
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• 2002

In this paper we discuss a multi-threaded baseband Processor capable of executing all physical layer processing of high data rate communications systems completely in software. We discuss the enabling technology for a software defined radio approach and present results for GPRS. 802.11b, and 2Mbps WCDMA. All of these protocols can be executed in real-time on the SB9600 chip using the Sandblaster core.

• Proceedings of the IEEK Conference
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• 2003.11b
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• pp.251-254
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• 2003

DMB is a next-generation multimedia broadcasting system that not only enables digital broadcasting services such as transmission of CD-duality audio, traffic information, and real-time stock information, but also allows reception of high-quality digital TV in high-speed driving conditions. In the DMB system, MPEG-2 TS(Transport Stream) multiplex method and MPEG-4 System SL(Sync Layer) have been selected as the delivery layer. In this paper, an efficient interface scheme between an MPEG-2 TS processing hardware and software-implemented MPEG-4 system within a DMB terminal device is proposed.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.90-90
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• 2000

The FAS protocol of FOUNDATION Fieldbus playes the roles of interface between Data Link Layer and application layer and establishment of connection between receiver and sender. In this study, the FAS protocol of FOUNDATION Fieldbus was developed. The method of implementation is described in this paper. Software of FAS protocol was implemented by Window-based program and DOS-based program for PC and sensor module, respectively.