the purpose of this paper is multi-objective optimization of refrigeration cycle by optimization of all components of the cycle contains heat exchangers, air condenser, evaporator and super-heater. studied refrigeration cycle is compression refrigeration cycle of unit 132 third refineries in south pars that provide chilled water for cooling refinery equipment's. cycle will be performed by ...

The Hamming Codes based Data Compression (HCDC) algorithm is a lossless data compression algorithm based on the concept of the error-correction Hamming Codes. The HCDC algorithm has been used successfully in a number of text compression applications providing a competitive compression ratio to existing well-known text compression algorithms. This paper describes an enhanced version of the HCDC ...

The present general lossless compression algorithm is not effective for the compression effect of JPEG files. In this article, the lossless compression method combining the shuffling algorithm with the lossless compression algorithm and a new shuffling algorithm are proposed, and this new algorithm could compresses the JPEG files without losses, and the result indicates that this algorithm can ...

In this paper, we propose a multilayer document compression algorithm. This algorithm first segments a scanned document image into different classes such as text, images and background, then compresses each class using an algorithm specifically designed for that class. Two algorithms are investigated for segmenting documents: a general purpose image segmentation algorithm called the trainable s...

ZPAQ is a tool for creating compressed archives and encrypted user-level incremental backups with rollback capability. It deduplicates any new or modified files by splitting them into fragments along content-dependent boundaries and comparing their cryptographic hashes to previously stored fragments. Unmatched fragments are grouped by file type and packed into blocks and either stored or compre...

Image compression is the application of Data compression on digital images. The discrete cosine transform (DCT) is a technique for converting a signal into elementary frequency components. It is widely used in image compression. Here we develop some simple functions to compute the DCT and to compress images. An image compression algorithm was comprehended using Matlab code, and modified to perf...

Since the birth of multi–spectral imaging techniques, there has been a tendency to consider and process this new type of data as a set of parallel gray–scale images, instead of an ensemble of an n–D realization. Although, even now, some researchers make the same assumption, it is proved that using vector geometries leads to better results. In this paper, first a method is prop...

since the birth of multi–spectral imaging techniques, there has been a tendency to consider and process this new type of data as a set of parallel gray–scale images, instead of an ensemble of an n–d realization. although, even now, some researchers make the same assumption, it is proved that using vector geometries leads to better results. in this paper, first a method is proposed to extract th...

We propose a special-purpose class of compression algorithms for efficient compression of Prolog programs. It is a dictionary-based compression method, specially designed for the compression of Prolog code, and therefore we name it PCA (Prolog Compression Algorithm). According to the experimental results this method provides better compression than state-of-theart general-purpose compression al...

Two compression algorithms for the image sequences generated by pulsed-transient thermography for non-destructive testing were developed. The first algorithm allows to balance the quality of the original measurement data reproduction against the compression ratio. This algorithm comprises a dedicated space/time mapping (STM) method and an image compression algorithm (JPEG2000). The second algor...