Andrey Leonov

S.I. Vavilov Institute for the History of Science and Technology of the Russian Academy of Sciences · Department of the History of Technics and Technical Sciences

The article describes the evolution of the cartography and toponymy of the second largest geyser field in the world – the Valley of Geysers in the Kronotsky Reserve (Kamchatka Peninsula, Russia), discovered in 1941. The toponymy evolved in close connection with the development of the cartographic base that passed through the three stages from the f...

Crosstalk effects are studied experimentally in a DWDM line with 100G DP-QPSK channels at a frequency convergence of the channels (three channels with a frequency separation of 50, 37.5 and 33 GHz) in the C-band. Spans of 100 km in length are used, with the number of spans varying from one to six. The required optical signal-to-noise ratio (OSNRR)...

The article discusses the history of development of virtual globes, from the first prototype to the modern software tools that enable creating of a virtual globe to anyone. In the introduction we briefly discuss the similarities and differences between the virtual globe and its predecessors and analogues - traditional globes and globes based on the...

We report an analysis of the problems encountered in the design of modern high-bit-rate coherent communication links. A phenomenological communication link model is described, which is suitable for solving applied tasks of the network design with nonlinear effects taken into account. We propose an engineering approach to the design that is based on...

This paper examines stimulated Brillouin scattering (SBS) suppression in multichannel DWDM systems owing to nonlinear cross interaction between the channels and its effect on optical signal quality (1/OSNRR) in a communication link. We present an experimental study of single-, three- and five-channel systems with 10 Gbit s⁻¹ NRZ channels. The optic...

Terrestrial laser scanning has become a standard surveying technique for creating 3D CAD models of industrial objects and for site documentation. However, some facility managers are no longer satisfied with purely static 3D models; they are increasingly demanding animation functionalities to improve maintenance and repair planning and also to guara...

Technological monuments are vulnerable to decay. 3D modelling and documentation are essential to avoid them falling into irreparable decline and to enable future restoration. Terrestrial laser scanning (TLS) is a proven technology for capturing complex objects. This article focuses on the TLS capture of two technological monuments: the Motherland C...

Design of DWDM lines requires calculation of optimal input powers for each span. It is called "optimization of DWDM network". Different approaches are currently used to solve this task including maximization of optical signal-to-noise ratio (OSNR) margin and minimization of bit error rate (BER). Within last years there is a particular interest to D...

The Shabolovka radio tower in Moscow, also known as the Shukhov tower, is a famous example of the Russian avant-garde style of the early 20th century. With a height of approximately 160 m, it is the highest hyperboloid lattice steel tower ever built by Shukhov and is one of the symbols of Moscow. It is widely recognized as an artifact of modern cul...

The study addresses the implementation of the project "A Virtual Model of Denisova Cave in the Altai Mountains" generating a 3D model of the cave and pinpointing certain key finds. The project includes the elaboration of software for interactive visualization in the virtual space of the cave. Apart from information about this unique site, the model...

The tower, located a few kilometers south of the Kremlin, consists of six hyperboloids on top of each other, crowned with a set of antennas. The lower four sections have 48 rods each and the upper two sections consist of 24 rods. Together they form the load-bearing structure for the antennas on top. The tower is not open to the public. The national...

Кроноцкий государственный природный биосферный заповедник, образованный в 1934 году, сохраняет уникальные природные богатства нашей страны. Среди них – удивительный природный комплекс долины реки Гейзерной – один из пяти крупнейших гейзерных районов на планете. Настоящая книга, изданная к 80-летию заповедника, представляет собой своеобразный картог...

This article presents the results of the project «Virtual Denisova Cave in the Altai Mountains». A virtual 3D model of Denisova Cave was developed based on laser scanning, as well as interactive stereoscopic 3D presentation for visualization of this model and additional information, both online and on Virtual Environment systems.

The article presents a project on a 3D documentation of the Valley of Geysers, Kamchatka (UNESCO Natural Heritage). The 3D document serves for virtual ecotourism, ecological education, scientific modeling and visualization.

Virtual 3D model of the Valley of Geysers, Kamchatka provides virtual travelling and interactive storytelling in the cyberspace and serves for scientific visualization, geodynamical processes modeling, disaster preparedness and response, environmental studies, ecological education, and virtual ecotourism.

Principles of constructing systems for generating DTDs for a collection of XML documents are discussed. Methods and algorithms for creating DTDs are developed. A DTD generation system for a collection of XML documents is developed. This system can efficiently be used both for solving applied problems and for theoretical studies.

The goal of this work is to construct an optimal relational schema for storing XML documents in a relational database (RDBMS) with the possibility of subsequently processing their elements without using information about the structure of these documents (such as DTD, XML Schema, and so on). A survey of the currently available methods for solving th...