• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.681-684
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• 2013

This paper compares the Java program environments and NDK program environments in the Android system. This paper experiments that how much is the performance enhancement in the NDK C programming of the Android system. I program sum of 1 to n for Java program and NDK C program. I experiment whether the influence an effect on a performance by changing n value. In experiment, NDK C program is over 50% performance enhancement than Java program.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.11
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• pp.2347-2354
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• 2012

On Android environment, program development is conducted with JAVA SDK. However, using JAVA, it is operated over virtual machine which shows lower performance in terms of speed than traditional C language programming. The method writes program in C language, which conducts operation efficiently. In the paper, we implement multiplication using NDK and SDK to analyze the public key cryptography over Android environment. In case of SDK, we used BigInteger package and in case of NDK, we used Comb method. Moreover, execution time of arithmetic, branch and call operations over Android environment is compared to understand performance enhancement using NDK package.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.10
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• pp.940-948
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• 2012

Android program is developed with JAVA SDK and executed over virtual machine. For this reason, programming is easier than traditional C language but performance of operating speed decreases. To enhance the performance, NDK development tool, which provides C language, assembly language environment, was proposed. Furthermore, with NEON function provided by ARM, we can utilize the vector operation and enhance performance. In the paper, we explore effectiveness of NDK and then propose advanced multiplication structure with NEON function.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.32-34
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• 2012

현재 Android 에서는 대부분 Java 언어로 응용 프로그램을 개발한다. 그러나 C 언어로 응용 프로그램을 개발해야 하는 경우도 많다. Android 에서 C 언어로 응용 프로그램을 개발하기 위해서는 NDK(Native Development Kit) 를 설치해서 사용해야 한다. Android 시스템에서 Linux 커널은 Android Runtime Java 프로세스만을 부팅한다. 그러나 만약 Android 에서 C 프로세스를 부팅한다면 C 언어로 직접 응용 프로그램을 개발할 수 있다. 본 논문은 Android 시스템에서 Android C 프로세스를 부팅시키는 간단한 방법을 제시한다. 그리고 적합한 C/C++ GUI(Graphic User Interface) 라이브러리와 응용 라이브러리를 확보하거나 또는 개발하여 설치한다면, 현재의 Java Android 를 C Android 로 변환시키게 된다.