Stanimir Mihaylov Sadinov

Prof. Dr. Stanimir Mihaylov Sadinov

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Academic Career Length

25Years (2002-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 May 2017
Verified
Conference Paper
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SSStanimir Mihaylov Sadinov
Stanimir Mihaylov Sadinov
1 January 2021 in IOP Conference Series: Materials Science and Engineering
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Conference Paper
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KAKrasen Angelov
Krasen Angelov
SSStanimir Mihaylov Sadinov
Stanimir Mihaylov Sadinov
PKPANAGIOTIS KOGIAS
PANAGIOTIS KOGIAS
The need for digital transformation in the industry and the related development of the Internet of Things (IoT) has led to the rapid development of various communication technologies and approaches for the implementation of flexible and intelligent communication networks. The main direction is wireless technologies, which make it possible to accelerate the wide range of new applications and services related to smart cities, industry, e-government and others. The possibilities are wide - use of different licensed or unlicensed frequency bands, channel bandwidths, modulation formats, power efficiency, reliability and security. Different network topologies could be applied for the access and collection of data from the sensor networks - star topology, mesh topology, tree topology, each of which has different advantages and disadvantages. This paper discusses the possibilities for deploying low-power mesh networks in an indoor scenario based on IQRF technology. Important communication parameters, approach advantages, and technological limitations will be highlighted. As an example, a study of network behaviour and efficiency in an indoor scenario will be considered.
17 April 2025 in Journal of Imaging
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Hristina StoychevaHristina Stoycheva
Hristina Stoycheva
GMGeorgi Mihalev
Georgi Mihalev
SSStanimir Mihaylov Sadinov
Stanimir Mihaylov Sadinov
KAKrasen Angelov
Krasen Angelov
This paper presents a modified image encryption scheme based on the OTP (One-Time Pad) algorithm, consisting of chaotic synchronization and artificial neural networks (ANNs) for improved security and efficiency. The scheme uses chaotic synchronization based on feedback control to create complex and unique encryption keys. Additionally, ANNs are used to approximate time functions, creating a neural encoding key, which adds an additional layer of complexity to the encryption process. The proposed scheme integrates static, chaotic, and neural keys in a multilayer structure, providing high resistance against statistical and cryptographic attacks. The results show that the proposed methodology achieves entropy values close to the theoretical maximum, effectively destroys the correlation between pixels, and demonstrates high sensitivity to variations in the input data. The proposed scheme shows very good feasibility in terms of both security and efficiency, which gives a reliable solution for secure image transmission and storage. This is proven by a study of resistance to various crypto–graphic attacks such as brute force attack, differential attack, noise and data cut attacks, key sensitivity, and computational complexity.
1 January 2021 in IOP Conference Series: Materials Science and Engineering
Verified
Conference Paper
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SSStanimir Mihaylov Sadinov
Stanimir Mihaylov Sadinov
KAKrasen Angelov
Krasen Angelov
PKP Kogias
P Kogias
Passive optical networks are emerging as the main technology for building access networks. The current metropolitan optical communication networks operate at 1Gbps, which appears to be insufficient for the future development and exponential growth of traffic from IP services. The existing various traffic-intensive services and the growing interest in 4K video content and streaming services require the introduction of new solutions within passive optical networks (PON). A promising option is the combination of 10 Gbps and above high-speed data transmission with spectral multiplexing. DWDM will provide the required high spectral efficiency, but in contrast will require the use of a proper modulation scheme to achieve a longer distance. In this paper a model for performance analysis and solving optimization problems for DWDM-PON networks is developed. Different signal modulations are considered and a comparative analysis is performed. The behaviour of the system at different input parameters is modelled. Performance analysis is performed by evaluating the spectral characteristics and values of BER and Q-factor.
1 October 2014 in Journal of Engineering Science and Technology Review
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Journal Article
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SSStanimir Mihaylov Sadinov
Stanimir Mihaylov Sadinov
PDP. Daneva
P. Daneva
PKPANAGIOTIS KOGIAS
PANAGIOTIS KOGIAS
17 January 2024 in Engineering Proceedings
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MTMiroslav Tomov
Miroslav Tomov
PKPANAGIOTIS KOGIAS
PANAGIOTIS KOGIAS
MMMichail N. Malamatoudis Michail N. Malamatoudis
Michail N. Malamatoudis Michail N. Malamatoudis
SSStanimir Mihaylov Sadinov
Stanimir Mihaylov Sadinov
This article describes the design of a local GSM signal amplifying system and presents the results of appliance performance measurements, simulations and analyses. The system consists of a receiving antenna of the Yagi type, a 50 Ω cable, a 0.5–1.5 GHz wideband RF amplifier and a transmitting antenna. A precise measurement of the S-parameters of each component is performed and recorded in the appropriate S-matrix data file format. The amplifying system is first realized in a Keysight Genesys programming simulation platform with S-models, created based on the measured data. That schematic is simulated and optimized by calculating additional impedance-matching circuits included in the initial schematic design.