• Proceedings of the KIEE Conference
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• 2004.07d
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• pp.2350-2352
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• 2004

This paper presents the implementation-tation of the real-time software GPS Receiver based on FFT and FLL assisted PLL tracking algorithm. The FFT(fast fourier transform) based GPS si-gnal acquisition scheme provides a fast TTFF(time to first fix) performance. The tracking based on FLL assisted PLL enables tracking of GPS signal in a high dynamic environment. The designed software GPS receiver uses the indexing method for generating replica carrier to reduce computation load. The performance of the implemented GPS receiver is evaluated using high-dynamic simulated data from a simulator and real static data.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.689-691
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• 2012

In this study, a MDDI protocol packet generation method that is implemented in software is proposed. MDDI protocol is used widely for display device. In this study, MDDI protocol packets are generated by software within micro processor. This method needs minimum hardware configuration. For implementation of this method, we design a hardware platform with a high performance microprocessor and a FPGA. The packets generated by software within microprocessor is converted into LVDS signals, and transmitted by hardware within FPGA.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.201-202
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• 2006

In this paper, we achieved software and hardware implementation of SHA-1 hash function for sensor network. We implemented the software to be compatible with TinySec. In hardware design, we optimized operation logics for small area of hardware and minimized data transitions of register memory for low power design. Designed the software and hardware is verified on commercial sensor motes and our secure motes respectively.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.05a
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• pp.96-99
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• 2002

This paper describes the implementation of a SoC(system on a Chip) for a mult communication terminal in ISDN network and also reviews the developed software struct service procedures which are working on the SoC. And finally this paper descr： of an ISDN terminal equipment using the implemented SoC and terminal software.

• Journal of Korea Multimedia Society
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• v.11 no.6
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• pp.835-844
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• 2008

ZigBee devices are limited in resources especially on power and computational capacity but also require real-time operation at MAC layer. Therefore, it is important to take those requirement into consideration of system software design. In this paper, we proposed a compact system software design to support simultaneously ZigBee and IEEE802.15.4. The design strictly respects the resource and real-time constraints while being optimized for specific functions of both Zigbee and IEEE802.15.4. Various evaluations are done to show significant metrics of our design.

• Journal of Korea Society of Digital Industry and Information Management
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• v.14 no.4
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• pp.93-99
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• 2018

This paper presents an implementation method using NDK (Network Developer's Kit) of GNU (GNU is Not Unix) Radio and Multicore DSP (Digital Signal Processor) to implement LTE (Long Term Evolution) SDR (Software Defined Radio) Platform. In order to satisfy 1.4MHz, 3MHz, 5MHz and 10MHz of the bandwidth supported by LTE, USRP (Universal Software Radio Peripheral) X series which is an RF (Radio Frequency) transceiver of Ettus Research was used. To control this, GNU Radio which is an open source software radio toolkit was used. We also used NDK from TI (Texas Instruments) DSP to transfer data between USRP and DSP. Experimental results show throughput results according to each bandwidth, thus confirming the feasibility of implementing LTE SDR Platform using GNU Radio and NDK of TI DSP.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2019.05a
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• pp.111-114
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• 2019

This paper intends to implement a software that controls TurtleBot 2 remotely. The moving of the robot TurtleBot 2 can be controlled using command control based on Windows 10 IoT core instead of the Robot Operating System (ROS). The implemented software allows the user to move remotely TurtleBot 2 in any specified direction and perform the monitoring such as reading feedback data from the robot. Through TCP/IP and serial communication technology, TurtleBot 2 can successfully receive command control and send feedback to the user. Using C# programming language, two Universal Windows Platform apps (client app and server app) have been implemented to allow communication between the user and TurtleBot 2. The result of this implementation has been verified and tested in an indoor platform.

• International Journal of Computer Science & Network Security
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• v.22 no.2
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• pp.81-90
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• 2022

There are several ways to improve software performance by using existing software. So, the developments of some programs are the most promising ways. However, traditional part programming studies usually assume that the components are recycled "as is". Existing models of component objects only provide limited support for partial adjustments, namely white box technologies ( copy-paste & inheritance) and the black-box methods (such as mixing and encapsulation). These technologies have problems related to recovery, efficiency, implementation of indirect costs, or their own problems. This paper suggests as JALTREE, The Black Box adaptation technology, which allows us for the implementation of previous components, but we need configurable the interface types, for measuring the adaptability. In this article we discussed the types of adjustments including component interfaces and component composition. An example of customizing JALTREE and component can be illustrated in several examples

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.263-264
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• 2020

현재 국내 자동차의 증가에 따른 주차 공간이 부족하여 주차문제가 사회문제로 커지고 있다. 본 논문에서는 주차문제 해결을 위해서 스마트 공유 주차장 시스템을 제안한다. 이 시스템은 기존 주차장에 IoT 장비를 설치하고 운영하여 주차장 활용을 최대화한다. 시스템의 빠른 개발 및 활용도를 높이기 위해서 클라우드 플랫폼을 사용하며 사용자용 스마트폰 앱을 제공할 것이다. 사용자는 앱을 통해서 근거리에 있는 주차장을 선택하여 주차 자리를 예약할 수 있다. 논문에서 실제 주차장 공간에 IoT 장비를 설치하여 실험을 진행할 예정이다. 실험을 통해서 제안하는 시스템의 가능성을 검증할 것이다.

• ETRI Journal
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• v.26 no.3
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• pp.241-251
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• 2004

We propose two improved scalar multiplication methods on elliptic curves over $F_{{q}^{n}}$ $q= 2^{m}$ using Frobenius expansion. The scalar multiplication of elliptic curves defined over subfield $F_q$ can be sped up by Frobenius expansion. Previous methods are restricted to the case of a small m. However, when m is small, it is hard to find curves having good cryptographic properties. Our methods are suitable for curves defined over medium-sized fields, that is, $10{\leq}m{\leq}20$. These methods are variants of the conventional multiple-base binary (MBB) method combined with the window method. One of our methods is for a polynomial basis representation with software implementation, and the other is for a normal basis representation with hardware implementation. Our software experiment shows that it is about 10% faster than the MBB method, which also uses Frobenius expansion, and about 20% faster than the Montgomery method, which is the fastest general method in polynomial basis implementation.