[Vol. 06, No. 11] [November 2020]

The vertical design spectrum was defined in modern seismic design codes as a ratio from horizontal response spectra for different levels of seismic intensity. These spectra are important for some special structural systems which are indicated in the seismic design codes. In this study, 268 sets of shallow crustal earthquakes in three magnitude levels of earthquakes were selected to evaluate the characteristics of the vertical design spectrum in the Egyptian design seismic code (ECP-201, 2012). The database records of strong motions were taken from Pacific Earthquake Engineering Research Center (PEER) for diverse areas in the world. Four types of soil (A, B, C and D) based on ECP-201 are used in the evaluations. The first type of elastic response spectrum for shallow crustal earthquakes was recommended according to the ECP-201. The evaluation indicated that significant differences between the mean vertical spectral response spectra and individuals derived from the ECP-201 code for different seismicity. The V/H ratio is sensitive to both earthquake magnitude levels and soil types.
Keywords: Vertical Design Spectrum; the Egyptian design code; earthquake magnitude;Strong-Motion; Seismic Site Classification

The recent strategies for creating machine learning algorithms require experts with significant information on machine learning. This outcomes in preparing wide scope of people who can educate machines. The discipline of machine teaching is placed on generating the optimum training set that can direct a learning algorithm with the most proficiency. The vital advantage of machine teaching is that it put computerization devices under the control of common consumers with no software engineering foundation - that is, subject specialists. The idea is to empower business clients to take machine teaching tools and apply them to issues explicit to their industry divisions. In this paper, we review the various machine teaching paradigms that is useful for the machine learning algorithm to perform efficiently and effectively. The suggestions and directions for futureinvestigation are likewise proposed.
Keywords: Artificial intelligence, machine learning, machine teaching, learning algorithms, teaching process.

In this paper evaluates the possibility uses of recycled fine aggregate (RFA) obtained from C& D waste a substitute of natural fine aggregate (river sand) for development of sustainable concrete. For this, an experimental investigation of M30 grade of concrete is prepared by using of 20, 30, 50, and 100% replacement of NFA by RFA and compared their results with conventional concrete (0% RFA). Target strength 30 MPa and slump value 100 mm is set for each series of concrete mix. Flow properties of concrete such as workability and harden properties like compressive strength, flexural strength, split tensile strength and modulus of elasticity evaluated. Results shows that compressive strength, flexural strength, splitting tensile strength and modulus of elasticity reduces 8.63%, 6.32%, 6.25% and 8.75%, respectively in concrete made with 30% replacement of NFA by RFA at 28 days than that of conventional aggregate concrete. In terms of rheological and mechanical properties, the trend displayed by concrete is also very much similar to the conventional concrete. Finding from this experimental study suggest that the RFA has enormous potential to considerably reduce the cost of concrete.
Keywords: Recycled fine aggregate, Rheological, RC

The parametric generators (PG-s) are high-efficient frequency dividers, that are often used in frequency mixing and modulation. The application range of PG-s is very large, e.g. in the quantum phase devices that are capable of receiving signals of lower intensity than noise, and storing of information for both phase information or quantization of stable phase states. PG-s are also present in many other applications.

In this paper, we proposes a new ID-based multi proxy signature is a solution of delegation of signing capabilities. Proxy signatures can combine other special signatures to obtain some new types of proxy signatures.
Keywords:Signature, multisignature, ID-Based

A multisignature scheme is a digital signature scheme that allows multiple signers to generate a single signature in a collaborative and simultaneous manner. In this paper we first review of the digital multisignature schemes using elliptic curvers and elliptic curve version of the multisignature scheme with distinguished signing responsibilities. Then, we propose a new multisignature scheme with distinguished signing responsibilities. In this scheme, each group member has distinguished signing responsibility and partial contents of the message can be verified without revealing the whole message. Our proposed scheme is more efficient than the scheme reviewed and capable of application in practice.
Keywords: Multisignature scheme, Elliptic curve, Distinguished signing responsibilities.