Showing papers in "Journal Scientific and Technical Of Information Technologies, Mechanics and Optics in 2016"

Тенденции разработки детонационных двигателей для высокоскоростных воздушно-космических летательных аппаратов и проблема тройных конфигураций ударных волн. Часть II. Исследования встречных ударных волн и тройных ударно-волновых конфигураций

Abstract: УДК 532.529 ТЕНДЕНЦИИ РАЗРАБОТКИ ДЕТОНАЦИОННЫХ ДВИГАТЕЛЕЙ ДЛЯ ВЫСОКОСКОРОСТНЫХ ВОЗДУШНО-КОСМИЧЕСКИХ ЛЕТАТЕЛЬНЫХ АППАРАТОВ И ПРОБЛЕМА ТРОЙНЫХ КОНФИГУРАЦИЙ УДАРНЫХ ВОЛН Часть II. Исследования встречных ударных волн и тройных ударно-волновых конфигураций П.В. Булат, П.В. Денисенко a Университет ИТМО, Санкт-Петербург, 197101, Российская Федерация b Университет Уорвика, Ковентри, CV4 7AL, Великобритания Адрес для переписки: pavelbulat@mail.ru Информация о статье Поступила в редакцию 29.12.15, принята к печати 24.02.16 doi: 10.17586/2226-1494-2016-16-2-199-223 Язык статьи – русский Ссылка для цитирования: Булат П.В., Денисенко П.В. Тенденции разработки детонационных двигателей для высокоскоростных воздушно-космических летательных аппаратов и проблема тройных конфигураций ударных волн. Часть II. Исследования встречных ударных волн и тройных ударно-волновых конфигураций // Научно-технический вестник информационных технологий, механики и оптики. 2016. Т. 16. No 2. С. 199–223. doi: 10.17586/2226-1494-2016-16-2-199-223 Аннотация Рассматриваются актуальные задачи развития теории интерференции газодинамических разрывов в приложении к задаче совершенствования силовых установок воздушно-космических летательных аппаратов, рассчитанных на большие сверхзвуковые скорости полета. В первой части обзора была изложена история изучения детонации и различные концепции детонационных двигателей, а также воздухозаборников, рассчитанных на гиперзвуковые скорости полета. Во второй части приведен обзор работ по развитию теории интерференции газодинамических разрывов. Приведена классификация газодинамических разрывов, ударно-волновых процессов, ударно-волновых структур, тройных конфигураций ударных волн. Показано, что многие из этих процессов сопровождаются явлением гистерезиса, имеются области неоднозначности, следовательно, при проектировании двигателей и воздухозаборников необходимо уметь создавать оптимальные ударно-волновые структуры и обеспечивать их устойчивость. Большое внимание в последнее время уделяется использованию в воздухозаборниках ударно-волновых структур, с переотражением скачков уплотнения и интерференцией скачков уплотнения противоположных направлений. В настоящем обзоре им уделено основное внимание, приведены ссылки на этапные работы, последние расчетные и экспериментальные результаты. К сожалению, в зарубежных обзорах пропущены многие этапные работы советских и российских исследователей, так как они не были опубликованы на английском языке. В то же время, именно советская школа газовой динамики сформулировала теорию интерференции газодинамических разрывов в современном виде. Одной из целей настоящего обзора является восполнение этого пробела. Обзор может быть рекомендован специалистам, инженерам и научным сотрудникам, работающим в области аэрокосмической техники. Ключевые слова ударная волна, ударно-волновые структуры, тройные конфигурации ударных волн, встречные ударные волны

Молекулярно-динамическое моделирование взаимодействия лизинового дендримера и пептидов Семакс

Abstract: The paper deals with the possibility of complex formation of therapeutic Semax peptides with lysine dendrimer by molecular modeling methods. Dendrimers are often used for delivery of drugs and biological molecules (e.g., DNA, peptides and polysaccharides). Since lysine dendrimers are less toxic than conventional synthetic dendrimers (e.g., polyamidoamine (PAMAM) dendrimer), we chose them and studied two systems containing dendrimer and the different number of Semax peptides. The study was carried out by molecular dynamics method. It was obtained that the stable complexes were formed in both cases. The equilibrium structures of these complexes were investigated. These complexes can be used in the future in therapy of various diseases as Semax peptides have significant antioxidant, antihypoxic and neuroprotecting action.

Анализ методов многомодального объединения информации для аудиовизуального распознавания речи

Abstract: The paper deals with analytical review, covering the latest achievements in the field of audio-visual (AV) fusion (integration) of multimodal information. We discuss the main challenges and report on approaches to address them. One of the most important tasks of the AV integration is to understand how the modalities interact and influence each other. The paper АНАЛИЗ МЕТОДОВ МНОГОМОДАЛЬНОГО ОБЪЕДИНЕНИЯ ИНФОРМАЦИИ ... Научно-технический вестник информационных технологий, механики и оптики, 2016, том 16, No 3 388 addresses this problem in the context of AV speech processing and speech recognition. In the first part of the review we set out the basic principles of AV speech recognition and give the classification of audio and visual features of speech. Special attention is paid to the systematization of the existing techniques and the AV data fusion methods. In the second part we provide a consolidated list of tasks and applications that use the AV fusion based on carried out analysis of research area. We also indicate used methods, techniques, audio and video features. We propose classification of the AV integration, and discuss the advantages and disadvantages of different approaches. We draw conclusions and offer our assessment of the future in the field of AV fusion. In the further research we plan to implement a system of audio-visual Russian continuous speech recognition using advanced methods of multimodal fusion.

Forensic linguistics: automatic web author identification

Abstract: Internet is anonymous, this allows posting under a false name, on behalf of others or simply anonymous. Thus, individuals, criminal or terrorist organizations can use Internet for criminal purposes; they hide their identity to avoid the prosecuting. Existing approaches and algorithms for author identification of web-posts on Russian language are not effective. The development of proven methods, technics and tools for author identification is extremely important and challenging task. In this work the algorithm and software for authorship identification of web-posts was developed. During the study the effectiveness of several classification and feature selection algorithms were tested. The algorithm includes some important steps: 1) Feature extraction; 2) Features discretization; 3) Feature selection with the most effective Relief-f algorithm (to find the best feature set with the most discriminating power for each set of candidate authors and maximize accuracy of author identification); 4) Author identification on model based on Random Forest algorithm. Random Forest and Relief-f algorithms are used to identify the author of a short text on Russian language for the first time. The important step of author attribution is data preprocessing discretization of continuous features; earlier it was not applied to improve the efficiency of author identification. The software outputs top q authors with maximum probabilities of authorship. This approach is helpful for manual analysis in forensic linguistics, when developed tool is used to narrow the set of candidate authors. For experiments on 10 candidate authors, real author appeared in to top 3 in 90.02% cases, on first place real author appeared in 70.5% of cases.

Имитационная модель поддержки проектирования инфокоммуникационных резервированных систем

Abstract: Subject of Research. The paper deals with the effectiveness of multipath transfer of request copies through the network and their redundant service without the use of laborious analytical modeling. The model and support tools for the design of highly reliable distributed systems based on simulation modeling have been created. Method. The effectiveness of many variants of service organization and delivery through the network to the query servers is formed and analyzed. Options for providing redundant service and delivery via the network to the servers of request copies are also considered. The choice of variants for the distribution and service of requests is carried out taking into account the criticality of queries to the time of their stay in the system. The request is considered successful if at least one of its copies is accurately delivered to the working server, ready to service the request received through a network, if it is fulfilled in the set time. Efficiency analysis of the redundant transmission and service of requests is based on the model built in AnyLogic 7 simulation environment. Main Results. Simulation experiments based on the proposed models have shown the effectiveness of redundant transmission of copies of queries (packets) to the servers in the cluster through multiple paths with redundant service of request copies by a group of servers in the cluster. It is shown that this solution allows increasing the probability of exact execution of at least one copy of the request within the required time. We have carried out efficiency evaluation of destruction of outdated request copies in the queues of network nodes and the cluster. We have analyzed options for network implementation of multipath transfer of request copies to the servers in the cluster over disjoint paths, possibly different according to the number of their constituent nodes. Practical Relevance. The proposed simulation models can be used when selecting the optimal design solutions for the redundant transmission and maintenance of requests time-critical for stay in information and communication system.

State-of-the-art tasks and achievements of paralinguistic speech analysis systems

Abstract: We present analytical survey of state-of-the-art actual tasks in the area of computational paralinguistics, as well as the recent achievements of automatic systems for paralinguistic analysis of conversational speech. Paralinguistics studies non-verbal aspects of human communication and speech such as: natural emotions, accents, psycho-physiological states, pronunciation features, speaker’s voice parameters, etc. We describe architecture of a baseline computer system for acoustical paralinguistic analysis, its main components and useful speech processing methods. We present some information on an International contest called Computational Paralinguistics Challenge (ComParE), which is held each year since 2009 in the framework of the International conference INTERSPEECH organized by the International Speech Communication Association. We present sub-challenges (tasks) that were proposed at the ComParE Challenges in 2009-2016, and analyze winning computer systems for each sub-challenge and obtained results. The last completed ComParE-2015 Challenge was organized in September 2015 in Germany and proposed 3 sub-challenges: 1) Degree of Nativeness (DN) sub-challenge, determination of nativeness degree of speakers based on acoustics; 2) Parkinson's Condition (PC) sub-challenge, recognition of a degree of Parkinson’s condition based on speech analysis; 3) Eating Condition (EC) sub-challenge, determination of the eating condition state during speaking or a dialogue, and classification of consumed food type (one of seven classes of food) by the speaker. In the last sub-challenge (EC), the winner was a joint Turkish-Russian team consisting of the authors of the given paper. We have developed the most efficient computer-based system for detection and classification of the corresponding (EC) acoustical paralinguistic events. The paper deals with the architecture of this system, its main modules and methods, as well as the description of used training and evaluation audio data and the best obtained results on machine classification of these acoustic paralinguistic events.

Мультиагентное планирование проезда перекрестка дорог беспилотными транспортными средствами

Abstract: We propose a traffic management system for autonomous vehicles that are agents at the intersection. In contrast to the known solutions based on the usage of semiautonomous control systems in assembly with the control unit, this algorithm is based on the principles of decentralized multiagent control. The best travel plan for intersection passage is produced by means of optimization methods jointly by all agents belonging to a dynamic collaboration of autonomous vehicles. The order of road intersection optimal for a given criterion is determined by the agents in the process of information exchange about themselves and environment. Our experiments show that this protocol can reduce significantly the traffic density as compared to the МУЛЬТИАГЕНТНОЕ ПЛАНИРОВАНИЕ ПРОЕЗДА ПЕРЕКРЕСТКА ДОРОГ... Научно-технический вестник информационных технологий, механики и оптики, 2016, том 16, No 5 840 traditional systems of traffic management. Moreover, the effectiveness of the proposed algorithm increases with increasing density of road traffic. In addition, the absence of the critical object, that is the control unit, in the control system, reduces significantly the effectiveness of possible failures and hacker attacks on the intersection control system.

Критерии оценки и модели информационных систем,обладающих свойством поведения

Abstract: The paper focuses on the creation of enterprise management information systems with the property of behavior. Behavior of information system is considered from the standpoint of its functions targeted expansion; the need for them arises from the variability of the external and internal environment. To create a system with behavior, integrated information systems are encouraged to be used constructed from highly specialized, low functional applications. Classification criteria of information systems with behavior are proposed by a set of functions, by options of control transfer to the application, by the integration level of information system components. Classification is revealed by integration levels of information system components. Within the classification four options for structural models of information systems are suggested. The first option is based on the integration of message brokers with achieving of automatic data transfer and the launch of the relevant applications. The second option is based on an integrated database that enables applications to operate in accordance with established regulations. The third version of the integration is carried out on the level of services and gives the possibility to build structures with preliminary uncertain configuration of intern applications for the actual problem solution. The fourth option is based on integration level of the interpretation of metadata for distributed database systems and applications that interact with these databases. The system behavior comes into existence in case of new application automatically exchanges input and output data with the other components of information system and has the possibility of flexible parameter setting of functions interaction.

Model of laser interaction with liquid droplet

Abstract: УДК 532.529 МОДЕЛЬ ВЗАИМОДЕЙСТВИЯ ЛАЗЕРНОГО ИЗЛУЧЕНИЯ С КАПЛЕЙ ЖИДКОСТИ К.Н. Волков, П.В. Булат, Е.Е. Ильина a Университет Кингстона, Лондон, SW15 3DW, Великобритания b Университет ИТМО, Санкт-Петербург, 197101, Российская Федерация Адрес для переписки: pavelbulat@mail.ru Информация о статье Поступила в редакцию 24.06.16, принята к печати 29.07.16 doi: 10.17586/2226-1494-2016-16-5-764-772 Язык статьи – русский Ссылка для цитирования: Волков К.Н., Булат П.В., Ильина Е.Е. Модель взаимодействия лазерного излучения с каплей жидкости // Научно-технический вестник информационных технологий, механики и оптики. 2016. Т. 16. No 5. С. 764–772. doi: 10.17586/22261494-2016-16-5-764-772

Method for creation of spherical panoramas from images obtained by omnidirectional optoelectronic systems

Abstract: УДК 004.021 МЕТОД СОЗДАНИЯ СФЕРИЧЕСКИХ ПАНОРАМ ИЗ ИЗОБРАЖЕНИЙ, ПОЛУЧЕННЫХ ВСЕНАПРАВЛЕННЫМИ ОПТИКО-ЭЛЕКТРОННЫМИ СИСТЕМАМИ В.П. Лазаренко, Т.С. Джамийков, В.В. Коротаев, С.Н. Ярышев a Университет ИТМО, Санкт-Петербург, 197101, Российская Федерация b ООО «ЭВС», Санкт-Петербург, 195253, Российская Федерация с Технический Университет, София, 1000, Болгария Адрес для переписки: saiberbest@gmail.com Информация о статье Поступила в редакцию 22.07.15, принята к печати 17.11.15 doi:10.17586/2226-1494-2016-16-1-46-53 Язык статьи – русский Ссылка для цитирования: Лазаренко В.П., Джамийков Т.С., Коротаев В.В., Ярышев С.Н. Метод создания сферических панорам из изображений, полученных всенаправленными оптико-электронными системами // Научно-технический вестник информационных технологий, механики и оптики. 2016. Т. 16. No 1. С. 46–53.

Environmentally friendly method of gaseous fuel combustion with the use of quasi-optical microwave

Abstract: Subject of Research. The paper deals with the problem of developing low emission combustors operating on natural gas or LPG, to reduce emissions of nitrogen oxides NOx. The possibility of burning very lean fuel mixtures is studied. To initiate the ignition and combustion stabilization the discharge generated by the quasi-optical microwave is used. Main Results. Initiating ignition by streamer microwave discharge increases the rate of combustion and combustion efficiency about four times as compared with the conventional spark ignition. Streamer discharge ignition by very lean fuel-air mixture is demonstrated with the factor of oxiding agent excess greater than the limit of explosive range under normal conditions. According to indirect indicators, ignition by microwave discharge created by quasi-optical radiation is of non-thermal nature. Microwave discharge excites oxygen atoms, and intense ultra-violet radiation is generated as a result that causes formation of cold nonequilibrium plasma with avalanche growth of free electrons. Streamer discharge propagates at a speed of 5 km /s, so the initiation of the ignition occurs immediately throughout. The temperature of the fuel mixture at the point of ignition initiation does not exceed 400 К. There is no area with a temperature sufficient to initiate thermal Zeldovich mechanism of emission of nitrogen oxides. Combustion rate is high. As a result the Fenimore mechanism of \"fast nitrogen oxides\" has no chance to be progressing, and NOx emissions in appreciable quantities are excluded. Energy costs are comparable with spark ignition. Practical Relevance. The studied technology is designed for low emission internal combustion engines, power gas turbines, gas compressor units, fueled by natural gas.