Computer systems and information technologies最新文献

{"title":"NETWORK FEATURES STUDY OF THE COMMUNICATION INTERFACE OF MULTIPROCESSOR MODULAR SYSTEMS","authors":"D. Moroz","doi":"10.31891/csit-2022-3-11","DOIUrl":"https://doi.org/10.31891/csit-2022-3-11","url":null,"abstract":"This paper considers so-called “blade” server solutions of multiprocessor systems with several of the same type of maternal modules installed in a single case. It is shown that the computations parallelisms effectiveness of such systems significantly depends on many factors; one of the most essential is the data features between the neighboring nodes of the multiprocessor system, which is usually the slowest part of the algorithm and can negate the effect of the number of used processors. The network interface channel aggregation can solve the indicated problem. \u0000The studies show that, at present, the channel aggregation problem in modular multiprocessor cluster systems has not been solved properly. Meantime, there are critically few studies that reveal the architectural influence of the multiprocessor system network interface on computing performance. \u0000The work set the goal to improve the network interface structure of the multiprocessor system and increase its performance by multidimensional network interface channels aggregation, adapted to solving the studied class problems. At the same time, the network interfaces main operating modes in multiprocessor computing systems were analyzed, their impact on the assessment of the parallelization performance was revealed, and ways to increase the multiprocessor system efficiency by its network interface architecture reorganization. \u0000An analysis of the detected modes of network interface operating in the modular multiprocessor cluster system was run. For the first time, analytical ratios of the multiprocessor computing system efficiency were derived from its network interface parameters. The operation conditions of the cut-through switch are determined so that the information is transmitted without the store-and-forward switching procedure. That approach ensures the transmission of the package at the highest speed, which leads to improving the multi-processing system efficiency in the organization of multi-channel modes of its network interface operation. \u0000The practical value of the results obtained is the proposed multiprocessor system application to create new technological processes. Separately, the application relevance of the proposed approach to solve the digital economy problems should be noted. \u0000  Keywords: multiprocessor systems, network interface, aggregation, computing nodes, acceleration of computations. \u0000Статтю присвячено дослідженню так званих \"блейд\" серверних рішень багатопроцесорних обчислювальних систем, відповідно до яких декілька однотипних материнських модулів встановлюються в одному корпусі. Показано, що ефективність розпаралелювання обчислень таких систем істотно  залежить від багатьох чинників. Проте, один з найважливіших - це особливості пересилки даних між сусідніми вузлами багатопроцесорної системи, яка зазвичай є найповільнішою частиною алгоритму. У зв'язку з цим підкреслюється, що важливим чинником підвищення ефективності функціонування модульних багатопроцесорних систем є","PeriodicalId":353631,"journal":{"name":"Computer systems and information technologies","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130660859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EVALUATION OF THE EFFICIENCY OF THE IMPLEMENTATION OF PARALLEL COMPUTATIONAL ALGORITHMS USING THE LIBRARY IN C++","authors":"O. Zhulkovskyi, I. Zhulkovska, V. Shevchenko, Hlib Vokhmianin","doi":"10.31891/csit-2022-3-6","DOIUrl":"https://doi.org/10.31891/csit-2022-3-6","url":null,"abstract":"Progressive hardware and software mean of paralleling and synchronization of calculations on modern computers with multicore architecture allow to increase the efficiency of computer modeling by increasing (by an order or more) the performance of calculations. The purpose of this work is to increase the efficiency of computational algorithms for the computer implementation of the sweep method by using modern advanced parallel programming techniques. The study used methods of matrix algebra, parallel computations, as well as analysis of the efficiency of algorithms and programs. As a result of the work, computational algorithms for sequential and parallelized in two threads sweep method were developed, and a comparative evaluation of the effectiveness of their implementation by means of thread control library C++ was performed. The order of SLAE in this case was up to 5×107. As a result of computational experiments, it was possible to achieve an increase in computational speed of 1.88-2.86 times. The results obtained correspond with similar data from available literature sources. The scientific novelty of the work lies in the subsequent development of promising approaches to increase the efficiency of computer simulation through the use of modern technologies and principles of parallel programming with computational experiments on modern hardware and software architectures. For the first time, estimates of the time of software implementation of algorithms for sequential and parallelized by means of the C++ library computational algorithms for the sweep method for a significant order of SLAE were obtained. The expediency of this paralleling is demonstrated for SLAEs of the order over 2.5×105. The main significance of the work lies in the practical application of the results obtained in computer simulation of engineering problems, the most resource-intensive stage of which is the multiple solution of SLAE of a significant order. Further prospects of research assume in-depth paralleling of algorithms for numerical solution of SLAE by using scalable variations of applied methods, choosing the most productive software technologies, paralleling the program code to the maximum (in terms of the number of processor cores) number of threads.","PeriodicalId":353631,"journal":{"name":"Computer systems and information technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130264726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CREATING A MODEL OF THE INFLUENCE OF SOUNDS ON THE EMOTIONAL STATE OF MAN","authors":"Bohdana Havrysh, Оlexandr Tymchenko","doi":"10.31891/csit-2022-3-8","DOIUrl":"https://doi.org/10.31891/csit-2022-3-8","url":null,"abstract":"The environment is full of various sounds - signals registered by human and animal hearing organs, which in terms of frequency and strength merge into a monotonous, incoherent sound. The physical carriers of signals reaching the hearing organs are acoustic (sound) waves – mechanical waves that propagate in the air and are perceived by the hearing organs. Human hearing organs can perceive sounds in a fairly wide range of frequencies and intensities. The range of sounds heard by a person is limited by two threshold curves: the lower one is the threshold of perception, the upper one is the threshold of pain sensations. The human hearing threshold is 0 dB at a frequency of 1000 Hz, and the pain threshold occurs from a sound of 140 dB [2]. As long as there have been wars, it is known that mass battle cries and drumbeats oppress the enemy. The sirens of attack planes and bombers make him feel terrified and want to run away. Now an explanation has been found for this: loud sounds excite a person, contribute to the influx of a large amount of hormones into the blood, in particular, adrenaline, as a result of which there is a feeling of danger and fear [3]. There is a description of existing approaches to assess the impact of sounds on the emotional state of man, which will be the first step towards creating a model for analyzing the impact of sounds on the emotional state of man based on the theory of discrete emotions. Generated values for emotional evaluation of sounds. \u0000 ","PeriodicalId":353631,"journal":{"name":"Computer systems and information technologies","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126091131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"METHOD FOR REDUCTIVE PRUNING OF NEURAL NETWORKS AND ITS APPLICATIONS","authors":"O. Gurbych, Maksym Prymachenko","doi":"10.31891/csit-2022-3-5","DOIUrl":"https://doi.org/10.31891/csit-2022-3-5","url":null,"abstract":"Trained neural networks usually contain redundant neurons that do not affect or degrade the quality of target identification. The redundancy of models possesses an excessive load on computational resources, leading to high electricity consumption. Further, the deployment and operation of such models in resource-constrained environments such as mobile phones or smart devices are either complicated or impossible. Therefore, there is a need to simplify models while maintaining their effectiveness. This work presents a method for fast neural network reduction, allowing for automatic detection and removal of a large number of redundant neurons while simultaneously improving the efficiency of the models. The technique introduces perturbations to the target variable and then identifies and removes the weights with the most considerable relative deviations from the weights of the control model. The method removes up to 90% of active weights. At the same time, unlike classical pruning methods, the efficiency of models improves simultaneously with the reduction. The scientific novelty of the work consists of method development and new practical applications. The reduction method detects and removes large groups of redundant parameters of neural networks. The logic of automatically determining the optimal number of residual \"significant\" weights was implemented. The mentioned features speed up the discovery and elimination of redundant weights; reduce required time and resources for computations; and automate the identification of the essential neurons. The method's effectiveness was demonstrated on two applied tasks: predicting the yield of chemical reactions and the molecular affinity. The implementation and applications of the method are available via the link: https://github.com/ogurbych/ann-reduction.","PeriodicalId":353631,"journal":{"name":"Computer systems and information technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130104248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DYNAMIC SEARCH FOR ERRORS IN INDUSTRIAL INTERNET PROTOCOLS FOR APPLICATION IN MULTISENSOR CONTROL SYSTEMS","authors":"H. Klym, Roman Dіachok","doi":"10.31891/csit-2022-3-9","DOIUrl":"https://doi.org/10.31891/csit-2022-3-9","url":null,"abstract":"  Based on the considered theory of dynamic damage analysis of industrial Internet protocols and determination of the necessary data of dynamic multimodal communication of the sensor, the method of fuzzy tests in combination with dynamic multimodal data transmission for jamming in multisensor control systems is proposed. The proposed method traces program execution, finds input fields affecting conditional branches through dynamic damage analysis, and captures the dependency of conditional branches to appropriately control test case grammar generation, increasing deep-level code execution. The results of the comparative experiment confirm that the method to some extent improves the validity of test cases and the speed of code coverage, as well as increases the probability of detecting anomalies in the implementation of the protocol. \u0000To evaluate multi-sensor computerized systems from the point of view of \"fuzzy intelligence\", studies were conducted to solve the problem of low code coverage caused by repeated execution of test sequences on the same path, starting from the system program level in the implementation of industrial Internet protocols and the prerequisite of obtaining affordable weekends program codes, or an executable binary file. The paper proposes a method that is combined with dynamic multimodal transmission of sensor data in a fuzzy processing program. It provides program execution, protocol implementation, finds input fields that affect conditional branches using dynamic inconsistency analysis, and captures dependency relationships between conditional branches to control test generation.","PeriodicalId":353631,"journal":{"name":"Computer systems and information technologies","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123597669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A SOFTWARE SOLUTION FOR QUALITY ASSESSMENT OF BUSINESS PROCESS MODELS","authors":"A. Kopp, D. Orlovskyi, Ilyass El Arbaouti","doi":"10.31891/csit-2022-3-12","DOIUrl":"https://doi.org/10.31891/csit-2022-3-12","url":null,"abstract":"One of the primary tools of the BPM (Business Process Management) paradigm is business process modeling. Business scenarios can be presented in the form of graphical models that can be easily understood by both Information Technology (IT) professionals and non-IT professionals – business analysts, software customers, department heads, top managers, and other stakeholders interested in business process improvement – using business process modeling. Small and large businesses can capture their operations in the form of graphic diagrams using business process modeling as the fundamental tool of the BPM approach, which can then be brainstormed by business analysts to uncover ways to optimize organizational workflows. Typically, business process improvement is accomplished by the automation of operations that have been recognized as “bottlenecks” following analysis. However, analyzing a business process model is only viable if it is clear and correct in terms of compliance with both the notation used and the actual business process it reflects. Therefore, this work examines the structural measures of the BPMN (Business Process Model and Notation) business process model. It is assumed that business process models that violate business process modeling rules are neither understandable nor suitable for further work with them, which can also lead to various errors occurring during the stage of business process analysis, as well as the stage of its improvement and implementation of proposed changes, i.e., during development, testing, and maintenance of distinct software components, information system modules, and so on. The object of this work is a process of quality assessment of business process models created using the BPMN notation. The subject of this work is a software solution for the quality assessment of business process models. The goal of this work is the evaluation of a probability of errors in business process models to improve their quality.","PeriodicalId":353631,"journal":{"name":"Computer systems and information technologies","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125996405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MATHEMATICAL MODEL DEPENDENCIES BAUD RATE FROM THE LENGTH OF THE SPECIALIZED DIGITAL NETWORK CANOPEN","authors":"Serhii Babchuk, T. Humeniuk, Iryna Babchuk","doi":"10.31891/csit-2022-3-4","DOIUrl":"https://doi.org/10.31891/csit-2022-3-4","url":null,"abstract":"At modern enterprises, the main increase in production occurs due to the increase in labor productivity by automating the processes of managing technological processes. Modern automation systems for the control of technological processes are, as a rule, created on the basis of microprocessor elements and specialized digital networks. Many modern process automation systems for controlling technological processes are based on a specialized CANopen digital network. The maximum length of a CANopen network segment can be 5000 m. The data transfer rate decreases as the segment length increases. However, until now there was no mathematical model of the change in data transmission speed depending on the length of the network segment. Therefore, the developers of the network and the organizations that support it experimentally determined the value of data transmission speed on network segments with a length of: 25, 50, 100, 250, 500, 1000, 2500, 5000 m. This fact complicated the process of analyzing computer systems at the stage their design. During the design of computer systems for control and management of industrial facilities that require a guaranteed reaction to random events in a set period of time, developers, as a rule, in cases where the length of the segment is in the intermediate sections between the specified points, perform calculations on the value of the speed for longer segment length than is real. Considering that there may be tens of thousands of nodes on complex objects, the sum results in a significant deviation from real performance indicators in the direction of increasing costs for unnecessary increase in system performance due to the impossibility of using in calculations the real values ​​of the data transmission speed for the real length of the segment between a node that transmits data and that receives data. A mathematical model of the dependence of the data transfer rate on the length of the CANopen network segment has been developed. Such a mathematical model should ensure the determination of the data transfer rate at any point of the segment of the specialized CANopen digital network. This will contribute to the improvement of the quality of design and will allow to create computer control and management systems that will meet the requirements of the consumer without excessive overspending","PeriodicalId":353631,"journal":{"name":"Computer systems and information technologies","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130696018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A NEW APPROACH FOR TEXT RECOGNITION ON A VIDEO CARD","authors":"L. Mochurad","doi":"10.31891/csit-2022-3-3","DOIUrl":"https://doi.org/10.31891/csit-2022-3-3","url":null,"abstract":"An important task is to develop a computer system that can automatically read text content from images or videos with a complex background. Due to a large number of calculations, it is quite difficult to apply them in real-time. Therefore, the use of parallel and distributed computing in the development of real-time or near real-time systems is relevant. The latter is especially relevant in such areas as automation of video recording of traffic violations, text recognition, machine vision, fingerprint recognition, speech, and more. The paper proposes a new approach to text recognition on a video card. A parallel algorithm for processing a group of images and a video sequence has been developed and tested. Parallelization on the video-core is provided by the OpenCL framework and CUDA technology. Without reducing the generality, the problem of processing images on which there are vehicles, which allowed to obtain text from the license plate. A system was developed that was tested for the processing speed of a group of images and videos while achieving an average processing speed of 207 frames per second. As for the execution time of the parallel algorithm, for 50 images and video in 63 frames, image preprocessing took 0.4 seconds, which is sufficient for real-time or near real-time systems. The maximum acceleration of image processing is obtained up to 8 times, and the video sequence – up to 12. The general tendency to increase the acceleration with increasing dimensionality of the processed image is preserved, which indicates the relevance of parallel calculations in solving the problem.","PeriodicalId":353631,"journal":{"name":"Computer systems and information technologies","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125206834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THEORETICAL AND METHODOLOGICAL ASPECTS OF ONTOLOGICAL MODELING OF INFORMATION-ANALYTICAL SYSTEM OF SCIENTIFIC PERSONNEL TRAINING","authors":"M. Rostoka","doi":"10.31891/csit-2022-3-10","DOIUrl":"https://doi.org/10.31891/csit-2022-3-10","url":null,"abstract":"The development of science and education is now exposed to a huge impact of such civilizational challenges as: climate change, which is due to global warming, excessive and unjustified consumption of material goods, environmental pollution; pandemic COVID 19 and the emergence of new diseases and as the quintessence of human irresponsibility and callousness, activation on a global scale, and in Ukraine in particular, hybrid wars against universal values. This situation causes a massive shift to a remote format of the organization of scientific and educational (research) process, including the training of scientific personnel in higher education institutions and research institutes, using certain networked information and computer technologies and systems. \u0000Therefore, the purpose of the study, the current results of which are presented in the article, is to study the problems of applying the methodology of building information-analytical systems (hereinafter – IAS), in particular digital IAS, and to substantiate the basis and highlight in this context the main aspects of creating an ontological model of scientific personnel training (hereinafter  – SPT) system as part of a single information space of scientific education. The author raises the problem of the need to apply transdisciplinary methodology of building digital information-analytical system of scientific personnel training in higher education institutions (hereinafter – HEI) and research institutes (hereinafter – RI) of Ukraine in a distance. Particular attention is paid to the ontological modeling of IAS components of the relevant organization of effective scientific and educational (research) process. Also basic definitions of the ontological approach to the training of scientific personnel disclosed. The article considers certain requirements for the design and functioning of intelligent educational systems and programs that provide adaptive information-analytical support of scientific personnel training on the basis of transdisciplinary, system, competence and ontological approaches. The analysis of a certain base of sources (researches and publications) is given. Thus, the methodological basis for building a digital information-analytical system in the specified context is presented and certain fragments of its ontological model are proposed. The presented approbation of applied aspects of the author's research is in the ascertaining stage. Subsequent results of analytical-synthetic and formative stages of the presented doctoral research are passing into the phase of experimental verification and the obtained data will be made public in the following publications of the author.","PeriodicalId":353631,"journal":{"name":"Computer systems and information technologies","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133961413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"METHOD OF ASSESSING THE REPUTATION OF A MEDICAL INSTITUTION (AS A MINER OF BLOCKCHAIN)","authors":"T. Hovorushchenko, Vitaliy Osyadlyi","doi":"10.31891/csit-2022-3-7","DOIUrl":"https://doi.org/10.31891/csit-2022-3-7","url":null,"abstract":"The healthcare sector in Ukraine has long been in need of change, and the many opportunities of blockchain technology can help it lead the transformation of this sector and ensure compliance with the requirements of efficiency, safety, novelty and economic benefits. \u0000Blockchain will transform medical enterprises and improve the quality of service, allowing new ecosystems and new business models to develop. Healthcare information stored in the blockchain can change the way clinical information is stored, as well as how information is shared in the organization, with healthcare partners, payers and, most importantly, patients. Blockchain decentralizes medical information by increasing the availability, efficiency, transparency, and credibility of data, but also requires careful planning to maximize the benefits it brings. With the help of the blockchain, users can store important medical data, the authenticity of which can be verified if there is a suspicion of forgery. In addition, cryptographic algorithms can be used to ensure the confidentiality of medical data (for example, an attacker will not be able to read the text if he stole data). Thus, the current challenge is the need to manage medical data based on blockchain technologies. \u0000The reputation of the medical institution (as a blockchain miner) is an important indicator, as the blocks are recorded by verified pre-selected validators and are in fact moderators of the system. It is to determine such validators that the value is not the number of tokens, but reputation, ie the blockchain according to a certain algorithm, taking into account the reputation, chooses a validator who will write the next block. Reputation grows with active life in the blockchain ecosystem and interaction with other participants. The better the reputation - the greater the chance of creating the next block. Therefore, the method of assessing the reputation of a medical institution (as a miner of blockchain), which allows to calculate and assess the reputation of a medical institution, was further developed in the article. \u0000Experiments on blockchain-based medical data management using the developed method of assessing the reputation of a medical institution (as a blockchain miner) - experiments to assess the reputation of a medical institution (for example, two different family medicine clinics) - as a blockchain miner.","PeriodicalId":353631,"journal":{"name":"Computer systems and information technologies","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125222514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}