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The ubiquitous game platform implemented by our team is composed of a C++ compiler, a java translator, and a virtual machine. The EVM (Embedded Virtual Machine) is a stack-based solution that supports object-oriented languages such as C++ and java. It uses the SIL (Standard Intermediate Language) as an intermediate language, which consists of an operation code set for procedural and object-oriented languages. The existing C++ compilers are used to execute programs after translating them into a target machine code. The downside of this method is its low practicality, along with its platform-dependency. To resolve this matter, we developed a C++ compiler that generates virtual machine codes based on platform-independent stacks that are not target machine codes. This paper presents a decompiler system that converts a C++ compiler generated intermediate language, namely SIL, to a representation of a C++ program. This method optimizes the simulation needed for the generation of exacted SIL code, and a solution that can verify the SIL code generation through a C++ program represented in the decompiler. Furthermore, the ease of extracting the meaning of a program, as opposed to assembly-structured SIL codes, allows much more convenience in changing the software structure and correcting it to improve performance. [ABSTRACT FROM AUTHOR]

Recently, According as digital technology with knowledge base society develops, illegal copy by user's vulnerability of copyright authentication becomes frequent. Therefore, it need research about user's copyright authentication method. In this paper, a watermark inserting adaptive method according to the sensitivity of human visual system (HVS) in DCT transform domain is proposed. Also, we proposed watermark techniques using adaptive voice information(VI). It effects that get in original image than method to use conventional image is less and shows robust watermark restoration ability form outside attack. Performance analysis is achieved about still image and restoration of watermark information using OFDM/QPSK still image transmission system in wireless channel environment. Analysis result, VI watermark performance that influence in original image is very small. And it could know that show high restoration performance. [ABSTRACT FROM AUTHOR]