bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Novel Intercarrier Interference Cancellation for MIMO-OFDM Systems
Authors: Yiwleak Aurupong , Pirak Chaiyod 
Published: April 2020

The main impairment of an orthogonal frequency division multiplexing (OFDM) systems is an intercarrier interference (ICI) effect caused by a frequency offset. A zero-padded technique designed for a conjugate cancellation scheme in MIMO-OFDM systems for ICI cancellation is proposed by padding zero between two consecutive symbols over a space-frequency domain. At the receiver, the ICI cancellation and space-frequency diversity combining techniques are proposed. In this paper, a performance analysis is investigated and analyzed. In comparison with the conventional complex conjugate scheme, the outage probability expressions of the proposed system and the repetition-coded conjugate cancellation scheme are derived for quasi-static Rayleigh fading channels. Simulation results show the close agreement with those obtained by theoretical analysis, which could be used to estimate the proposed system performance. Finally, simulation results in time-varying frequency-selective fading channels, a bit error rate (BER) performance of the proposed system is significantly improved over both the ordinary zero-padded MIMO-OFDM systems and the repetition-coded conjugate cancellation scheme when the frequency offset is not greater than 10% of subcarrier spacing. Furthermore, the proposed system is shown to be able to attain significant diversity gain.
A Security Key Recovery System with Channel Quality Awareness for Smart Grid Applications
Authors: Huadpaknam Prachya , Pirak Chaiyod , Mathar Rudolf 
Published: April 2020

In this paper, a security key recovery system with channel quality awareness (SKRS-CQA) for smart grid applications has been proposed. Firstly, the proper key recovery agents (KRAs) are determined based on the signal-to-noise ratio (SNR) outage probability. The result of such selection includes the number and the index of selected KRAs. Then, the session key (KS) of a Smart Meter Unit (SMU) will be divided into many different pieces according to the proposed key partitioning algorithm and stored in the selected KRAs for the future key recovery if the data concentrator unit (DCU) has lost the key in unexpected events. The outage probability of SNR, the probability of KRA failure, and the probability of key compromising are also investigated. In addition, a 128-bit AES-GCM encryption algorithm is used in each KRA for authentication and identification mechanisms based on a DLMS/COSEM protocol. As shown in the system performance analysis, the system reliability, the system availability, and the data confidentiality have been improved compared with the conventional scheme. Moreover, a cooperative communication network with an amplify-and-forward relaying protocol and an optimal power allocation has been employed for improving the system reliability. From computer simulation results, it showed that the reliability of the proposed system with a cooperative scheme has been improved significantly.
Test Input Data Generation for Choiceless Program Nets
Authors: Biao Wu , Ge Qi-Wei 
Published: April 2020

Software testing is an important problem in designing a large software system and this problem is difficult to be solved due to its computational complexity. We try to use program nets to approach this problem and have proposed algorithms to divide a whole program net into subnets that can structurally cover the original one based on divide-and-conquer method. This paper aims to solve the remaining task of our approach, that is how to find test input data for each subnet to be called choiceless program net. Firstly, definitions of program nets are extended and the properties of choiceless program nets are analysed. Secondly, polynomial algorithms are proposed to get all constraint conditions of any given choiceless program nets. Finally, a method to generate test input data under the obtained constraint conditions is proposed by adopting an SMT (Satisfiability Modulo Theories) solver, $Z3$ prover, and also an example is given to show the usefulness of our method.
3.1. АНАЛИЗ ВЛИЯНИЯ ОСНОВНЫХ ПРОИЗВОДСТВЕННЫХ ФОНДОВ НА КОНКУРЕНТОСПОСОБНОСТЬ ВЫСОКОТЕХНОЛОГИЧНЫХ ПРЕДПРИЯТИЙ (НА ПРИМЕРЕ АВИАСТРОЕНИЯ)
Authors: Klochkov V.V. 
Published: April 2020

The influence of fixed assets on the competitiveness of high-tech enterprises and their products is considered. We systematize significant characteristics of fixed assets and mechanisms of their impact on the competitiveness of products and enterprises (for which we propose quantitative indicators, taking into account the specifics of the Russian high-tech industry). Special attention is paid to the modern organizational structures of high-tech industries, which affect both competition and the appearance of fixed assets. The aircraft industry is considered as the main example.Рассматривается влияние основных производственных фондов на конкурентоспособность высокотехнологичных предприятий и их продукции. Систематизированы значимые характеристики основных фондов и механизмы их влияния на конкурентоспособность продукции и предприятия (для которых предложены количественные показатели с учетом специфики российской высокотехнологичной индустрии). Особое внимание уделено современным организационным структурам высокотехнологичных отраслей, которые накладывают отпечаток и на конкуренцию, и на облик основных фондов. В качестве основного примера рассматривается авиастроение.
9.3. США: рынок федеральных фондов в условиях избытка ликвидности и перспектива монетарной политики
Authors: Cherkasov V.Y. , Kontsevich O.V. , Kontsevich O.V. , Kontsevich O.V. 
Published: April 2020

Анализируются особенности денежно-кредитной политики в США после завершения количественного смягчения и нюансы, от которых зависит конъюнктура рынка федеральных фондов в условиях долговременного структурного профицита ликвидности. Объяснены причины усиления волатильности процентной ставки в последние месяцы 2019 года, что потребовало от ФРС использования оперативных инструментов регулирования ликвидности. Приведены аргументы, на основании которых авторы считают вероятным в будущем повторное применение количественных методов монетарной политики в США. Кратко описан риск, который влечет за собой вымывание избыточных резервов в наличный денежный оборот в связи с использованием доллара США за пределами государства-эмитента.The article analyzes the features of monetary policy in the United States after the completion of quantitative easing and the nuances that determine the environment in the federal funds market in the context of a long-term structural liquidity surplus. We explain the reasons for the increase in interest rate volatility in the last months of 2019, which required the Fed to use short-term liquidity stabilization tools, and argue our view why it seems likely that the FED to reuse quantitative policy in times to come. In conclusion we describe the risk entailed by excess reserves reallocation into cash circulation in light of US dollars use outside the issuing economy.
8.3. СУЩНОСТЬ И СТРУКТУРА ЭКОНОМИЧЕСКОЙ БЕЗОПАСНОСТИ РЕГИОНА
Authors: Kiselеvа I.A. , Iskajyan S.O. , Iskajyan S.O. , Iskajyan S.O. 
Published: April 2020

Статья посвящена вопросам изучения сущности и структуры экономической безопасности регионов как ключевых составляющих экономической безопасности государства. В современном мире глобализации для государств становятся крайнее актуальными вопросы экономической независимости, стабильности и самодостаточности регионов. В данной работе проанализированы составляющие экономической безопасности региона. Сделаны выводы о необходимости классификации экономических угроз региона, определения их роли и значимости в структуре экономической безопасности региона.The article is devoted to the study of the essence and structure of the economic security of the regions, as key components of the economic security of the state. In the modern world of globalization, the issues of economic independence, stability and self-sufficiency of regions are becoming extremely urgent for states. This paper analyzes the components of the regions economic security. Conclusions are drawn about the need to classify the regions economic threats, determine their role and significance in the structure of the regions economic security.
7.3. ПОВЫШЕНИЕ ЭФФЕКТИВНОСТИ СТОИМОСТНЫХ МЕТОДОВ УПРАВЛЕНИЯ ФИНАНСАМИ КОРПОРАЦИИ
Authors: Fedotova M.Yu. , Tagirova O.A. , Nosov A.V. , Murzin D.A. , Murzin D.A. , Murzin D.A. 
Published: April 2020

В статье в качестве критерия оценки развития компании предложено использование ее стоимости. Расчеты с помощью метода чистых активов показали, что за последние пять лет стоимость исследуемой организации значительно снизилась, это свидетельствует о недостаточной эффективности управления финансами. Проведен анализ факторов, влияющих на стоимость компании, и сделан вывод о верной стратегии ее развития. Росту стоимости может помочь выпуск новой продукции и закупка нового оборудования, структурная перестройка, повышение прозрачности и открытости бизнеса. Предложена система управления стоимостью компании и выделены факторы ее успешного внедрения.The article suggests the use of its value as a criterion for assessing the development of a company. Calculations using the net asset method have shown that over the past five years, the value of the organization under study has decreased significantly, this indicates insufficient financial management. The analysis of factors affecting the value of the company is carried out, and a conclusion is drawn about the right strategy for its development. The increase in value can be helped by the release of new products and the purchase of new equipment, structural adjustment, increased transparency and openness of the business. A company value management system is proposed and factors for its successful implementation are highlighted.
8.8. ПРЕИМУЩЕСТВА И НЕДОСТАТКИ ГРУППЫ БРИКС: АЛЬТЕРНАТИВНЫЙ ВЗГЛЯД
Authors: Frumina S.V. , Frumina S.V. , Frumina S.V. 
Published: April 2020

В статье рассмотрены тенденции развития стран членов БРИКС с позиции их инновационного, инвестиционного и торгового потенциала. Акцент делается на взаимовыгодных сторонах сотрудничества внутри объединения, обосновываются конкурентные преимущества и достоинства каждой из стран. Особое внимание уделяется негативным факторам развития членов БРИКС, которые в будущем могут представлять значительные угрозы объединению.The article considers the development trends of the BRICS member countries from the perspective of their innovative, investment and trade potential. The emphasis is on the mutually beneficial aspects of cooperation within the association, the competitive advantages and advantages of each country are substantiated. Particular attention is paid to the negative development factors of the BRICS members, which in the future may pose significant threats to unification.
4.2. Аналитические аспекты оценки рисков аудиторских организаций в условиях перехода на международные стандарты аудита
Authors: Sinianskaia E.R. , Rusheva I.A. 
Published: April 2020

The article presents the materials of the study conducted by the authors of changes in the market of audit services from 2013 to 2017, and also structured the problems that arose in the first one and a half years of the transition period to ISA. Based on the results of the study, a model has been developed that allows us to assess risk factors in the process of reforming the industry to increase the competitiveness of the audit organization.В статье изложены материалы проведенного авторами исследования изменений на рынке аудиторских услуг с 2013 по 2017 гг., а также структурированы проблемы, возникшие в первые полтора года переходного периода на международные стандарты аудита. По результатам исследования разработана модель, позволяющая оценивать факторы риска в процессе реформирования отрасли для повышения конкурентоспособности аудиторской организации.
8.1. ДИНАМИКА ОСНОВНЫХ ФАКТОРОВ МИРОВОГО ПРОДОВОЛЬСТВЕННОГО КРИЗИСА В ИСТОРИЧЕСКОМ ПРОЦЕССЕ
Authors: Ablaev R.R. , Kokodey T.A. , Lomachenko T.I. , Lomachenko T.I. , Lomachenko T.I. 
Published: April 2020

Проведен качественный и количественный анализ динамики основных факторов продовольственного кризиса в историческом процессе и составлен прогноз динамики дальнейшего развития с использованием методов и средств эконометрического моделирования. Продемонстрирован факт, что в развитых странах Европы и США отсутствует проблема нехватки продовольствия, а, напротив, наблюдается избыточное потребление гражданами продуктов питания. Но существуют страны, в которых проблема недостатка продовольственных товаров актуальна. Затронута проблема неравномерного распределения продовольствия и последствий, вытекающих из возникшей ситуации.Qualitative and quantitative analysis for the dynamics of the main factors of the global food crisis in history is conducted. Projections of the further tendencies are made using econometrics modeling means. The fact is demonstrated that in the developed countries of Europe and the USA there is no problem of food shortages, but, on the contrary, there is an excessive consumption of food by citizens. But there are countries in which the problem of food shortages is relevant. The problem of uneven distribution of food and the consequences arising from the situation have been raised.
6.2. Либерализация рынка капитала материкового Китая
Authors: Shupletsov A.L. , Shupletsov A.L. , Shupletsov A.L. 
Published: April 2020

На протяжении последних двух десятилетий Китай постепенно, но планомерно открывает свой национальный рынок капитала для иностранных инвесторов. К текущему моменту через так называемые мосты между биржами Шанхая, Шэньчжэня и Гонконга иностранным и китайским инвесторам доступно свыше 2 000 акций для взаимной торговли.For more than the past two decades China has been gradually but systematically opening up its national capital market to foreign investors. Over 2,000 shares for mutual trade have been made available by now to foreign and Chinese investors via the so-called Connects between the exchanges in Shanghai, Shenzhen and Hong Kong. The Chinese stock market today is one of the youngest (the Shanghai Stock Exchange, for example, turns 29 years old this year) and at the same time the most attractive in terms of the profitability/risk ratio developed countries show no tangible dynamics of economic growth, nor yields on their securities, while India and Vietnam, which are comparable in terms of economic growth rates to Chinese ones, cannot offer similar market volumes. For example, the United States has long sought the Chinese capital market to be opened, especially after China had entered the WTO. Russian investors have also been interested in the securities of Chinese companies for a long time, but until as recently as 2014 they had not had a simple mechanism to purchase them. The opening of Chinas huge capital market which is in progress expands the opportunities for Russian investors to diversify their investment portfolios this is especially important in the face of the risk of various sanctions bans that may be imposed by the UK, the EU and the USA. From the standpoint of bilateral economic relations, the access of Russian investors to the Chinese stock and debt markets may contribute to increasing the volume of the currency derivatives market and, subsequently, expanding and strengthening the use of national currencies in trade between Russia and China. The article examines main causes and stages of the liberalization of the Chinese capital market, terms of trade through the Shanghai-Hong Kong Stock Connect and Shenzhen-Hong Kong Stock Connect, and the prospects for further opening of the Chinese capital market.
9.1. ЦИФРОВАЯ ТРАНСФОРМАЦИЯ ПРОМЫШЛЕННОСТИ РОССИИ: СОСТОЯНИЕ И ПЕРСПЕКТИВЫ
Authors: Vlaskin G.A. , Ivanov A.E. , Ivanov A.E. , Ivanov A.E. 
Published: April 2020

В статье проведен анализ текущего состояния цифровизации российской промышленности, рассмотрены проблемы и выявлены перспективы трансформации промышленности в цифровой экономике. Мониторинг процесса выявил достаточно высокую степень первичной компьютеризации, растущую включенность промышленных предприятий в цифровой обмен с поставщиками и потребителями, динамичное развитие отечественного программного обеспечения. Одновременно он показал, что развитие цифровой трансформации российской промышленности по сравнению со странами-лидерами этого глобального процесса находится пока еще на начальной стадии, а достижение поставленных амбициозных задач требует высокой инновационной активности и грамотной промышленной политики. В работе раскрываются существующие барьеры и трудности на пути реализации этих требований, а также предлагаются шаги по их преодолению в интересах ускорения развития отечественной экономики в целом.The article analyzes the current state of digitalization of the Russian industry, considers the problems and prospects of transformation of industry in the digital economy. Monitoring of the process revealed a sufficiently high degree of primary computerization, the growing involvement of industrial enterprises in the digital exchange with suppliers and consumers, the dynamic development of domestic software. At the same time, he showed that the development of digital transformation of the Russian industry in comparison with the countries-leaders of this global process is still at an early stage, and the achievement of ambitious goals requires high innovation activity and competent industrial policy. The paper reveals the existing barriers and difficulties in the implementation of these requirements, and proposes steps to overcome them in order to accelerate the development of the domestic economy as a whole.
5.8. СОВЕРШЕНСТВОВАНИЕ УПРАВЛЕНИЯ ДОХОДАМИ РЕГИОНАЛЬНЫХ БЮДЖЕТОВ В РОССИЙСКОЙ ФЕДЕРАЦИИ
Authors: Aleshin D.V. , Aleshin D.V. , Aleshin D.V. 
Published: April 2020

В статье представлены результаты проведенного анализа структуры и динамики доходов региональных бюджетов в Российской Федерации с выявлением доминирующих факторов, повлиявших на их формирование. На основе авторского подхода осуществлена классификация российских регионов с учетом рисков по отношению к устойчивому развитию субъектов РФ. Дано обоснование использования теории вероятностей при бюджетном планировании и прогнозировании. Исследование базируется на большом количестве собранных эмпирических данных Федерального казначейства, Министерства финансов РФ, Федеральной службы государственной статистики.The article presents the results of the analysis of the structure and dynamics of regional budget revenues in the Russian Federation with the identification of the dominant factors that influenced their formation. Based on the authors approach, the classification of Russian regions was carried out taking into account risks in relation to the sustainable development of the constituent entities of the Russian Federation. The rationale for using theory of chances in budget planning and forecasting is given. The study is based on a large amount of empirical data collected by the Federal Treasury, the Ministry of Finance of the Russian Federation, and the Federal State Statistics Service.
Measurement of the Cosmic Microwave Background Polarization Lensing Power Spectrum from Two Years of POLARBEAR Data
Authors: Faúndez M. Aguilar , Arnold K. , Baccigalupi C. , Barron D. , Beck D. , Beckman S. , Bianchini F. , Carron J. , Cheung K. , Chinone Y. , Bouhargani H. El , Elleflot T. , Errard J. , Fabbian G. , Feng C. , Fujino T. , Goeckner-Wald N. , Hamada T. , Hasegawa M. , Hazumi M. , Hill C. A. , Hirose H. , Jeong O. , Katayama N. , Keating B. , Kikuchi S. , Kusaka A. , Lee A. T. , Leon D. , Linder E. , Lowry L. N. , Matsuda F. , Matsumura T. , Minami Y. , Navaroli M. , Nishino H. , Pham A. T. P. , Poletti D. , Puglisi G. , Reichardt C. L. , Segawa Y. , Sherwin B. D. , Silva-Feaver M. , Siritanasak P. , Stompor R. , Suzuki A. , Tajima O. , Takatori S. , Tanabe D. , Teply G. P. , Tsai C. ,   (The Polarbear Collaboration)
Published: April 2020

Abstract
We present a measurement of the gravitational lensing deflection power spectrum reconstructed with two seasons of cosmic microwave background polarization data from the Polarbear experiment. Observations were taken at 150 GHz from 2012 to 2014 and surveyed three patches of sky totaling 30 square degrees. We test the consistency of the lensing spectrum with a cold dark matter cosmology and reject the no-lensing hypothesis at a confidence of 10.9σ, including statistical and systematic uncertainties. We observe a value of A
L = 1.33 ± 0.32 (statistical) ±0.02 (systematic) ±0.07 (foreground) using all polarization lensing estimators, which corresponds to a 24% accurate measurement of the lensing amplitude. Compared to the analysis of the first-year data, we have improved the breadth of both the suite of null tests and the error terms included in the estimation of systematic contamination.
Choked Accretion onto a Schwarzschild Black Hole: A Hydrodynamical Jet-launching Mechanism
Authors: Tejeda Emilio , Aguayo-Ortiz Alejandro , Hernandez X. 
Published: April 2020

Abstract
We present a novel, relativistic accretion model for accretion onto a Schwarzschild black hole. This consists of a purely hydrodynamical mechanism in which, by breaking spherical symmetry, a radially accreting flow transitions into an inflow-outflow configuration. The spherical symmetry is broken by considering that the accreted material is more concentrated on an equatorial belt, leaving the polar regions relatively under-dense. What we have found is a flux-limited accretion regime in which, for a sufficiently large accretion rate, the incoming material chokes at a gravitational bottleneck and the excess flux is redirected by the density gradient as a bipolar outflow. The threshold value at which the accreting material chokes is of the order of the mass-accretion rate found in the spherically symmetric case studied by Bondi and Michel. We describe the choked accretion mechanism first in terms of a general relativistic, analytic toy model based on the assumption of an ultrarelativistic stiff fluid. We then relax this approximation and, by means of numerical simulations, show that this mechanism can operate also for general polytropic fluids. Interestingly, the qualitative inflow-outflow morphology obtained appears as a generic result of the proposed symmetry break, across analytic and numeric results covering both the Newtonian and relativistic regimes. The qualitative change in the resulting steady-state flow configuration appears even for a very small equatorial-to-polar-density contrast (∼0.1%) in the accretion profile. Finally, we discuss the applicability of this model as a jet-launching mechanism in different astrophysical settings.