The objective of this paper is to give a comprehensive introduction to applied cryptography with an engineer or computer scientist in mind. The emphasis is on the knowledge needed to create practical systems which supports integrity, confidentiality, or authenticity. Topics covered includes an introduction to the concepts in cryptography, attacks against cryptographic systems, key use and handling, random bit generation, encryption modes, and message authentication codes. Recommendations on algorithms and further reading is given in the end of the paper. This paper should make the reader able to build, understand and evaluate system descriptions and designs based on the cryptographic components described in the paper.

[서평]「Applied Cryptography」

We present the theory and design of interval type-2 fuzzy logic systems (FLSs). We propose an efficient and simplified method to compute the input and antecedent operations for interval type-2 FLSs: one that is based on a general inference formula for them. We introduce the concept of upper and lower membership functions (MFs) and illustrate our efficient inference method for the case of Gaussian primary MFs. We also propose a method for designing an interval type-2 FLS in which we tune its parameters. Finally, we design type-2 FLSs to perform time-series forecasting when a nonstationary time-series is corrupted by additive noise where SNR is uncertain and demonstrate an improved performance over type-1 FLSs.

https://sipi.usc.edu/~mendel/publications/Liang%26Mendel%20TFS%2010-00%20%232.pdf

Interval type-2 fuzzy logic systems: theory and design

We introduce a type-2 fuzzy logic system (FLS), which can handle rule uncertainties. The implementation of this type-2 FLS involves the operations of fuzzification, inference, and output processing. We focus on "output processing," which consists of type reduction and defuzzification. Type-reduction methods are extended versions of type-1 defuzzification methods. Type reduction captures more information about rule uncertainties than does the defuzzified value (a crisp number), however, it is computationally intensive, except for interval type-2 fuzzy sets for which we provide a simple type-reduction computation procedure. We also apply a type-2 FLS to time-varying channel equalization and demonstrate that it provides better performance than a type-1 FLS and nearest neighbor classifier.

/pdf/type-2-fuzzy-logic-systems-20ss17tkqw.pdf

Type-2 fuzzy logic systems

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Design Of Analog Cmos Integrated Circuits

Introduction to Mathematical Statistics. By R.V. Hogg and A. T. Craig. Pp. ix, 245. 47s. 1959. (The Macmillan Company, New York)

Increased usage of mobile devices has surged demand for RF spectrum considerably. Cognitive radios (CR) hold tremendous promise for improving spectral efficiency in the wireless system. It provides a fair solution for the dynamic allocation of frequencies between the primary user (PU) and secondary user (SU). Efficient techniques for spectrum holes’ estimation in available band maximize the system capacity, but in the limited band, it is tough to provide an unutilized band for SU. Since the secondary network is established where the licensed band is underutilized but if the licensed band is over-utilized, SU may still communicate if interference is lower than Ith to the primary user. This paper investigates the capacity of a secondary user with the variation of the power of SU in interweave and underlay network. It provides the novel solution for the performance of SU in hybrid network mode, where SU requires larger bandwidth but the availability of spectrum to the cognitive user is less.

Hybrid CR Network: An Approach Based on Interweave- and Underlay-Type CR Network

In this paper, a design and analysis of compact probe fed slot antenna is presented. The proposed antenna has simple structure consisting Ω-shape on a rectangular patch, the overall dimension of the antenna come around 36mm×26mm×5.127mm and fed by 50Ω probe feed. The impedance matching and radiation characteristics of the designed structure are investigated by using MOM based IE3D™. The simulation results show that the antenna impedance bandwidth of the antenna reaches about 31 %(4.25GHz–5.8GHz) with return loss better than −10 dB over the chosen frequency spectrum. The proposed antenna gain of 9dBi and 7dBi are achieved. Its radiation patterns are also studied.

/pdf/a-compact-wide-band-patch-antenna-for-wlan-application-3thibvvkcc.pdf

A compact wide band patch antenna for WLAN application

This paper presents an efficient VHDL implementation of circularly shifted partial transmit sequence (CS-PTS) scheme for peak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) signals. It eliminates the search for optimum phase factors from a given set, which manifests improved PAPR at reduced computational complexity as compared to conventional PTS (C-PTS). The amplitude of the signal is reduced by rotating each of the partially transmitted sequence anti-clockwise by a pre-determined degree and the peak power is reduced by circularly shifting the quadrature component of the partially transmitted sequence after phase rotation. A brief description of C-PTS and CS-PTS is also presented and VHDL implementation of Circularly Shifted PTS is designed. The peak-to-average power ratio performance of the proposed method has been investigated.

VHDL implementation of circularly shifted PTS technique for PAPR reduction in OFDM

This work is concentrating on generating gamma-gamma turbulence model taking into consideration the Forward method, Matsuno method, Huen method, Runge-Kutta 2 method (mid-point), Runge-Kutta 4 method, Adams-Bashforth 2 method (extrapolates P, Z in time), Adams-Bashforth 3 method (extrapolates P, Z in time), Quasi-Adams-Bashforth 2 method (extrapolates P, Z in time) and Adams-Moulton 3 method. Where P stands for atmospheric pressure and Z stands for atmospheric height. Analyzing the gamma-gamma pdf for smaller and larger separation of time-scale regimes using stability and skewness criterion, we concluded that the Matsuno and Quasi-Adams-Bashforth 2 methods are suitable for generating accurate gamma-gamma turbulence model. Keywords Forward, Matsuno, Huen, Runge-Kutta 2 (RK2), Runge-Kutta4 (RK4), Adams-Bashforth 2 (AB2), Adams Bashforth 3 (AB3), Quasi-Adams-Bashforth 2 (QAB2), Adams-Moulton 3 (AM3)

/pdf/modified-gamma-gamma-turbulence-model-using-numerical-2r4btk2u0y.pdf

Sarat Kumar Patra

Papers

Hybrid CR Network: An Approach Based on Interweave- and Underlay-Type CR Network

A compact wide band patch antenna for WLAN application

VHDL implementation of circularly shifted PTS technique for PAPR reduction in OFDM

Modified Gamma-Gamma Turbulence Model Using Numerical Integration Methods

Subset Centre Selection with Fuzzy Implemented Radial Basis Function Equalisers