evaluate the performance of the drilling bits used in well Saddad-1-

The subject of this research is to evaluate the performance of the drilling bits used to reach the final depth of the well in regards to mechanical speed, (alpha) factor, the cost per meter and to recognize the bit that has the highest performance. Obtaining such important info is vital for the successful planning and running of the potential exploration and appraisal wells in Saddad area. The efficient planning of the drilling operations results in decreasing the total drilling time which reflects in turn on the significant decrease in the total drilling cost.

Using modeling to study the effect of tooth shape on the stress field under the tooth

In this article we studied two types of teeth, spherical and conical one. We compared the results with a previous study for the flat tooth. the study of stresses field under these three teeth show that in the soft rocks we prefer to use conical tooth because it is easy to be Implanted in the rock, and this was confirmed by the values of stresses under the tooth. Either in hard rock and due to our need for big values of pressure to shatter the rock we prefer to use spherical tooth because of its property of forming tow cons of stresses under tooth and therefore can be good in drilling hard rock..

Developing an Approach for Data Steganography in Image by Segmentation to Different Size Random Blocks

In this paper we propose a new steganography algorithm by a random image segmentation to blocks of different size with several steganographic algorithms to increasing the security of hiding data. Both color and gray images have been used as cover files for our method.

Evaluation Wireless Connection performance with respect to modulation scheme, transmitter power, effective interference and ECC threshold

Wireless communication has become more popular over the last decade. Although there are many advantages to use wireless over fixed line systems, there is a major disadvantage, which is a high transmission error rate in a temporal and permanent noisy environment. There are techniques to reduce effectiveness off transmission errors in wireless communications. We have discussed in this paper. Many methods and techniques have been implementing to deal and resist errors (by increasing transmission power, switching modulation scheme) as well as evaluation the wireless connection performance taking into account many factors.

Improving Reliability for Bit-Flipping Algorithm for Decoding Low Density Parity Check Convolutional Codes

The Low-Density Parity Check Convolutional Codes (LDPC-CC) are considered of forward error correction codes, which combine the power of LDPC block codes and Convolutional codes. LDPCCC have several features such as they can be encoded with arbitrary length by simple shift registers and can be decode by only one decoder.

Study and analysis of the impact of noise on the receiver sensitivity in the digital optical communication system

The effect of thermal noise and shot noise on the receiver sensitivity in a digital optical communication system will be studied and analyzed. Also, the positive and negative effects of Parameters on the receiver sensitivity will be highlighted. The programming tools (MATLAB) is used to study the relationship between the receiver sensitivity and bit rate. It showed that the shot-noise-limited receiver sensitivity is much better than the thermal -noise-limited receiver sensitivity with best 30dB. The study also provided an explanation for the preference of optical detector (APD) compared to that in (PIN) optical detector from sensitivity side due to its internal gain, this can be achieved when the thermal noise is dominant. However, the preference of optical detector(PIN) will be better in case of shot noise is dominant. Analyzed results show that there is a significant improvement in the shot-noiselimited receiver sensitivity for high quantum efficiency and high wavelength. However, the sensitivity is deteriorated to get a lower error rate. The thermal -noise-limited receiver sensitivity showed an improving by increasing the responsivity and the load resistance. However, it decreases by increasing the number of noise and the error rate.

Simulation and estimation for cooperative communication performance in wireless communication systems

Although Multi-Input-Multi-Output MIMO improve reliability of wireless transmission system and increase bit rate, but this improvement relay on higher cost in Hardware and increase in size as well as complex structure, so the cost-effective challenge still exists to implement these technique. Performance can be improved without increasing the cost significantly by using virtual MIMO systems where the spacing is achieved by using pre-existing devices within the network infrastructure, these systems called cooperative communication systems, which are the subject of this research. The simulation is based on standard software for modeling MATLAB and open sourced Network simulator-3 (NS-3) to characterize problems in wireless communications systems and propose appropriate solutions.

Studying the Effects of Bandwidth and Bit Error Rate on the OFDM Technique Using Fuzzy Logic

This work aims to analyze the performance of Orthogonal Frequency Division Multiplexing (OFDM) applied in the fourth generation mobile networks and WiFi. Fuzzy logic technique is used in this study to analyze the problem of OFDM, taking into consideration the modulation techniques applied in OFDM. Three input parameters in the fuzzy logic system are mainly considered: signal-to-noise ratio, the modulation degree and the number of sub-carriers. The output parameters are selected to be the bandwidth and bit error rate. This requires an analytical study to determine the optimal values of the input parameters used in this study. This means studying the membership of functions of each input and output parameter using fuzzy logic.