• Journal of the Korea Institute of Information Security & Cryptology
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• v.26 no.5
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• pp.1105-1119
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• 2016

Android includes SEAndroid as a core security feature. SELinux is applied to Android OS as a SEAndroid, because there exists structural differences between Linux and Android. Since the security of SEAndroid depends on the reliable policy if the policy is tampered by the attacker, the serious security problems can be occurred. So we must protect policies which are the most important thing in SEAndoroid. In this paper, we analyze the process of SEAndroid policy updating to find out vulnerabilities and study the attack points on policy tampering. And we propose the SPPA to detect whether the policy is modified by an attacker. Moreover, we prove the performance and the effect of our proposed method on mobile device.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.5
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• pp.731-742
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• 2022

PIPO is the latest domestic lightweight block cipher announced in ICISC'20, which is characterized by being lightweight to facilitate implementation on IoT with limited resources. In this paper, PIPO 64/128-bit and 64/256-bit were implemented using web-based languages such as Javascript and WebAsembly. Two methods of performance evaluation were conducted by implementing bitsice and TLU, and the performance was compared by implementing Looped written using for statements and Unrolled written for statements. It performs performance evaluations in various web browsers such as Google Chrome, Mozilla Firefox, Opera, and Microsoft Edge, as well as OS-specific environments such as Windows, Linux, Mac, iOS, and Android. In addition, a performance comparison was performed with PIPO implemented in C language. This can be used as an indicator for applying PIPO block cipher on the web.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.7 no.6
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• pp.48-56
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• 2008

This study provides to car driver with car exhaust gas and sensor information which are car trouble code in engine and many sensors when the car has some problems. This is to provide car manager with many information of car sensors when we go to vehicle maintenance. For example, information of engine RPM, fuel system, intake air temperature, air flow sensors and oxygen sensors can provide to owner or garage, and also add to multimedia system for mp3 files and video files. This system consists of embedded linux system of low power while driving the car which uses OBD-II protocols and zigbee communication interface from CAN communication of car system to self-diagnosis embedded system of car. Finally, low power embedded system has a lot of application and OBD-II protocols for embedded linux system and CAN communication which get sensor informations of car control sensor system while driving the car.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.28 no.2
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• pp.109-116
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• 2005

In the previous C/S publishing system, the editor or contributor can arbitrarily modify the document created by the author, in which case it is difficult to identify the changes made in the document. Another shortcoming is in that when the document is in need of tracking or editing, the client must have the respective editing system. To solve this problem, the gist of the document must be preserved along with the document itself, and the process of handling the document must be standardized. Publishing on the web ensures a more stable and accurate result in processing documents. The significance of web publishing is made clear, when we consider the importance of information per se and the growing demand for immediate publication in the present day. The need for a simple and straightforward apache-based PDF publishing system, in which HTML and CSS are supported, and a converting engine provides PDF standard security application support, is prominent. This provides a library in which one can directly create a PDF via Windows, Linux, or Unix without having to rely on a client, allowing high-speed PDF creation. The development of a web-accessed PDF converting engine forms the basis for e-transactions, online brochures, electronic B/L, and many other industrial sectors.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.551-554
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• 2011

덮어쓰기 제약(overwirte limitation)과 삭제 횟수 제한(limitted erase cycle)이 있는 플래시 메모리의 특징이 의하여, 플래시 메모시는 시스템에서 요청한 쓰기 요청보다 많은 수의 쓰기 연산을 수행하게 되는데, 시스템에서 요청한 쓰기요청과 실제 쓰기 연산 간의 비율을 쓰기 증폭 인자(Write Amplification Factor, 이후 WAF)라 한다. WAF는 성능과 신뢰성에 중요한 요소로 본 논문에서는 WAF를 예측 할 수 있는 분석모델을 제안한다. 제안된 모델은 페이지 사상 FTL, 블록 사상 FTL, 혼합 사상 FTL 등 다양한 FTL에서 WAF를 예측 할 수 있으며, 예측에 사용되는 매개 변수로 이용율(utilization), 무작위율(randomness), 연관도(Associativity)만을 사용하여 단순하다는 특성이 있다. 본 논문은 실제 Linux 환경에서 측정한 WAF와 비교 분석 결과 제안된 모델이 WAF를 정확히 예측 할 수 있음을 발견하였다.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.643-648
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• 2005

Generally, ships have marks of various shapes on outside of the hull. Among them, so called "Draft Mark" indicates the distance from the bottom of the keel to the waterline. Draft marks are used to determine the displacement and other properties of the ship for stability and control purposes. These marks are made up of welding bead or sticking the steel plate on outside of the hull. To improve the confidence level of the ship owner, quality and accuracy of the draft mark is very important. So the automatic mark welding robot is used to enable a high quality and accurate manufacturing line. To improve the system portability, the system is divided into two distinct parts, namely mechanical part and control part. Mechanical part is robust, a lightweight, and easy to dismantle. The control part consists of an in-house developed controller, which is based on embedded Linux. Also, the control part consists of power line communication module to ensure the applicability of the controller in manufacturing line. In this paper, the methodologies of control and configuration of the robot are discussed.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.11
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• pp.2708-2716
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• 2013

This paper presents implementation of embedded remote monitoring diagnosis system which has effective wireless channel structure and communication protocols with user-friendly UI for intelligent digital vessel. Developed system contains integrated vessel monitoring system, server, exclusive mobile terminal and smart phone. We designed an effective dual structure communication channel and simple but effective communication protocol on the monitoring system. Failures of the wireless communication are minimized and the wrong wireless communication channel is immediately replaced. In addition, we developed an effective embedded Linux UI for LCD. The implemented wireless monitoring system was tested and verified on digital vessel.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.7
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• pp.1553-1557
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• 2004

A real-time processing system for embedded hardware genetic algorithm is suggested. In order to operate basic module of genetic algorithm in parallel, such as selection, crossover, mutation and evaluation, dual processors based architecture is implemented. The system consists of two Xscale processors and two FPGA with evolvable hardware, which enables to process genetic algorithm efficiently by distributing the computational load of hardware genetic algorithm to each processors equally. The hardware genetic algorithm runs on Linux OS and the resulted chromosome is executed on evolvable hardware in FPGA. Furthermore, the suggested architecture can be extended easily for a couple of connected processors in serial, making it accelerate to compute a real-time hardware genetic algorithm. To investigate the effect of proposed approach, performance comparisons is experimented for an typical computation of genetic algorithm.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.01a
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• pp.125-128
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• 2016

본 논문에서는 다중 생체계측 장비를 CMCIS(Central Monitoring and Cardiology Information System) 기반의 통합 시스템에 연동하기 위한 MDEC(Medical Device Exchange Communication)의 설계 및 구현을 소개한다. MDEC은 6종의 계층장비의 신호를 받아 각 서버로 데이터를 전송할 수 있도록 설계하고 Linux OS을 포팅 하였다. 각 장비별 프로토콜에 대해 최소화된 기본 프로토콜을 정의하고 통신방법에 따라 UART 포트 혹은 USB 포트를 생체정보의 물리적 입력장치로 사용하였다. 호스트 서버와는 유무선 LAN울 통해 정보를 전달할 수 있게 하드웨어를 설계하였다. 본 연구의 결과는 CMCIS 기반의 통합 시스템을 구축하는 기반기술로 향후 효율적 의료서비스에 기여할 것으로 사료된다.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.11
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• pp.1255-1266
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• 2014

This thesis presents MPU module, Base board and sensor module which are efficient industrial control through design and manufacture as developing S5PV210 CPU of SAMSUNG used by ARM Cortex-A8 based on Android which is Open mobile platform is installed to embedded system. Data for temperature and humidity which are received by sensor module proved the suitability and validity for the real time framework design as implementing application program employed the smart phone App with hybrid application based on DB of web server.