scholarly journals Features of Organization and Application of Active Balancing Cells with Extended Triggering Range of Shunt Circuits Keys in Ionistor Modules and Storage Devices of Joint-Stock Company “Elecond”

2021 ◽  
Vol 24 (3) ◽  
pp. 68-77
Author(s):  
T.G. Chikurov ◽  
M.V. Kibardin ◽  
S.L. Shirokih
Keyword(s):  
Storage Device ◽  
Joint Stock Company ◽  
Stock Company ◽  
Voltage Level ◽  
Storage Devices ◽  
Active Balancing ◽  
And Performance ◽  
Comparison Circuit ◽  
And Storage ◽  
Shunt Circuit

The solution of the problem of the deficit of voltage level for the complete unlocking of MOSFETs used as keys in the shunt circuits of the cells of the active balancing of ionistor storage devices is given. In particular, a revision of the widespread two-pole circuit of the active balancing cell of the ionistor consisting of a comparison circuit and a shunt circuit with a key on the MOSFET is presented. The relevance of the problem is confirmed by the results of the analysis of the characteristics of the key MOSFETs at the level of the unlocking voltage of 2.5...2.7 V from the output of the comparison circuit. It is shown that this voltage is not sufficient to provide the channel resistance corresponding to a fully open transistor and the flow of the specified shunt currents in the entire range of external influencing factors (VVF), especially when exposed to a reduced temperature from plus 15 to minus 60 °C. The solution presented in the paper for finalizing the circuit of the active balancing cell is that voltage boost circuits are introduced between the comparison node and the shunt circuit. Their use allows you to increase the voltage at the gate of the key MOSFET by two, three, four, etc. times, which ensures the reliable operation of the shunt circuit key for different shunt currents. A special feature of the developed cell circuits is the three-pole switching, in which an additional output is connected to the adjacent ionistor cell. This method of switching on the developed active balancing cells provides doubling of the unlocking voltage on the gate and is sufficient for reliable unlocking of the key on the MOSFET at all shunt currents at the level of the charging voltage of the ionistors in the storage device 2.5...2.7 V. For shunt currents of the order of tens of amperes, it is shown that it is necessary to switch to a quasi-four-pole switching of the developed active balancing cell due to the separation of the supply power circuits (measuring circuits) of the comparison circuit and the power buses of the level-up circuit with the shunt circuit. The methods of switching on the developed cells that allow multiplying the unlocking voltage at the gate of the key MOSFET by three, four or more times are shown. The schemes and criteria for the necessity of applying such inclusion are given. Practical testing of the developed three-pole and quasi-four-pole active balancing cells, carried out on the ionistor NEE of JSC “Elecond”, showed satisfactory stability and performance under the influence of the entire set of VVF.

scholarly journals Situation Analysis Report Phu Nhuan Jewelry Joint Stock Company

2021 ◽  
Author(s):  
AISDL
Keyword(s):  
Asia Pacific ◽  
Joint Stock Company ◽  
Situation Analysis ◽  
Stock Company ◽  
And Performance

Phu Nhuan Jewelry Joint Stock Company, better known with abbreviation name as PNJ, is one of the most renowned and respected jewelry retailers in Vietnam. Not only is PNJ domestically successful, but the company is also honored in Asia by Retail Asia magazine (Singapore) as one among top 500 retailers in Asia Pacific between 2004 and 2009. Officially established on 28 April 1988 by twenty progressive like-minded people in Phu Nhuan district, PNJ has been since showing strong and consistent development and performance, and has consolidated its position as the biggest player in the Vietnamese jewelry sector.

Application and Storage-Aware Data Placement and Job Scheduling for Hadoop Clusters

2020 ◽  
Vol 29 (16) ◽  
pp. 2050254
Author(s):  
Tao Li ◽  
Shuibing He ◽  
Ping Chen ◽  
Siling Yang ◽  
Yanlong Yin ◽  
...  
Keyword(s):  
Completion Time ◽  
Large Scale ◽  
Job Scheduling ◽  
Data Placement ◽  
Storage Device ◽  
Storage Devices ◽  
Average Completion Time ◽  
Hadoop Clusters ◽  
And Storage ◽  
Existing Data

As one of the most popular frameworks for large-scale analytics processing, Hadoop is facing two challenges: both applications and storage devices become heterogeneous. However, existing data placement and job scheduling schemes pay little attention to such heterogeneity of either application I/O requirements or I/O device capability, thus can greatly degrade system efficiencies. In this paper, we propose ASPS, an Application and Storage-aware data Placement and job Scheduling approach for Hadoop clusters. The idea is to place application data and schedule application tasks considering both application I/O requirements and storage device characteristics. Specifically, ASPS first introduces novel metrics to quantify I/O requirements of applications. Then, based on the quantification, ASPS places data of different applications to the preferred storage devices. Finally, ASPS tries to launch jobs with high I/O requirements on the nodes with the same type of faster devices to improve system efficiency. We have implemented ASPS in Hadoop framework. Experimental results show that ASPS can reduce the completion time of a single application by up to 36% and the average completion time of six concurrent applications by 27%, compared to existing data placement policies and job scheduling approaches.

scholarly journals An Empirical Evaluation of NVM-Aware File Systems on Intel Optane DC Persistent Memory Modules

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1977
Author(s):  
Guangyu Zhu ◽  
Jaehyun Han ◽  
Sangjin Lee ◽  
Yongseok Son
Keyword(s):  
Data Management ◽  
Empirical Evaluation ◽  
File Systems ◽  
Data Management System ◽  
Nand Flash ◽  
Storage Devices ◽  
Persistent Memory ◽  
Memory Modules ◽  
And Performance ◽  
And Storage

The emergence of non-volatile memories (NVM) brings new opportunities and challenges to data management system design. As an important part of the data management systems, several new file systems are developed to take advantage of the characteristics of NVM. However, these NVM-aware file systems are usually designed and evaluated based on simulations or emulations. In order to explore the performance and characteristics of these file systems on real hardware, in this article, we provide an empirical evaluation of NVM-aware file systems on the first commercially available byte-addressable NVM (i.e., the Intel Optane DC Persistent Memory Module (DCPMM)). First, to compare the performance difference between traditional file systems and NVM-aware file systems, we evaluate the performance of Ext4, XFS, F2FS, Ext4-DAX, XFS-DAX, and NOVA file systems on DCPMMs. To compare DCPMMs with other secondary storage devices, we also conduct the same evaluations on Optane SSDs and NAND-flash SSDs. Second, we observe how remote NUMA node access and device mapper striping affect the performance of DCPMMs. Finally, we evaluate the performance of the database (i.e., MySQL) on DCPMMs with Ext4 and Ext4-DAX file systems. We summarize several observations from the evaluation results and performance analysis. We anticipate that these observations will provide implications for various memory and storage systems.

scholarly journals Battery Characterization and Dimensioning Approaches for Micro-Grid Systems

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1305 ◽  
Author(s):  
Sofia Boulmrharj ◽  
Youssef NaitMalek ◽  
Abdellatif Elmouatamid ◽  
Mohamed Bakhouya ◽  
Radouane Ouladsine ◽  
...  
Keyword(s):  
Energy Management ◽  
Energy Production ◽  
Production Systems ◽  
Renewable Energy Sources ◽  
Optimum Size ◽  
Grid Systems ◽  
Storage Devices ◽  
Micro Grid ◽  
And Performance ◽  
And Storage

Micro-Grid (MG) systems have been extensively studied and deployed to lower the power consumption while reducing the greenhouse gas emissions. Although, the challenge with Renewable Energy Sources (RES) is their uncertain and intermittent nature, things that led the researchers to think about integrating storage devices, especially batteries, into MG systems. The main aim is to store the excess of produced energy for further usage when not enough energy is available. Nevertheless, batteries modeling and characterization is mandatory to identify their parameters and study their performance within MG systems. Moreover, in order to continuously supply electricity to the building, it is required to figure out the optimum size of energy production systems and storage devices. This paper introduces a methodology for MG modeling and performance evaluation. Its main contribution is twofold, i) battery’s parameters identification, and ii) modeling and dimensioning method for both standalone and MG systems. An instrumentation platform, composed of recent sensing and actuating equipment, for MG energy management and battery characterization is developed. Simulation and experimental results show the effectiveness of the proposed methodology.

EFFICIENCY OF COST AND RESULTS MANAGEMENT IN A JOINT STOCK COMPANY

2021 ◽  
Vol 4 (4) ◽  
pp. 10-14
Author(s):  
V. S. VOLKOV ◽  
Keyword(s):  
Comparative Analysis ◽  
Economic Analysis ◽  
Performance Management ◽  
Corporate Management ◽  
Processing Plant ◽  
Joint Stock Company ◽  
Meat Processing ◽  
Stock Company ◽  
Results Management ◽  
And Performance

The article is devoted to a comprehensive economic analysis of the efficiency of cost and performance management of three meat processing corporations operating in the competitive sphere of the Moscow region. On the basis of a comparative analysis of private and generalized indicators, an assessment of the effective-ness of corporate management is given. A more in-depth and detailed analysis was carried out in relation to ZAO Mikoyanovsky Meat Processing Plant for 2017–2019 in comparison with 2012, due to which factors and reserves for increasing profits and profitability were identified.

Studying Demand for Institutes of Corporate Governance: Legal Aspects

2003 ◽  
pp. 50-61 ◽  
Author(s):  
T. Medvedeva ◽  
A. Timofeev
Keyword(s):  
Corporate Governance ◽  
Legal Aspects ◽  
Joint Stock Company ◽  
Federal Law ◽  
Stock Company ◽  
Open Joint Stock Company ◽  
Open Joint ◽  
Market Relations ◽  
Corporate Legislation

The article analyzes legal aspects of institutes of corporate governance. Different draft laws "On Joint-Stock Companies" are considered which reflected interests of separate groups of participants of market relations. Stages of property redistribution are outlined. The advantages of the model of the open joint-stock company are formulated. Special attention is paid to the demand for legal institutes of corporate governance as well as to the process of accepting the Federal Law "On Entering Amendments to the Federal Law "On Joint-Stock Companies"" which was enacted in 2002. The article contains proposals directed at improvement of corporate legislation.

Assessment of professional risk of health of workers of the enterprise for repair of railway carriage

2020 ◽  
pp. 9-19
Author(s):  
O. Klepikov ◽  
A. Boreyko ◽  
G. Kurenkova
Keyword(s):  
Relative Risk ◽  
Working Conditions ◽  
Light Level ◽  
Occupational Risk ◽  
Rolling Stock ◽  
Joint Stock Company ◽  
Stock Company ◽  
Production Factors ◽  
Object Of Study ◽  
High Level

The aim of the study was to assess the professional risk of developing diseases in workers of the railway car repair enterprise. The Voronezh Car Repair Plant, a branch of Vagonremmash Joint-Stock Company, was chosen as the object of study. Methods: «The methodology for calculating individual occupational risk depending on the working conditions and the health status of the employee», developed by the Klin Institute for Protection and Working Conditions in conjunction with the Research Institute of Occupational Medicine (2013), the main professions; cohort study with the calculation of the relative risk of morbidity with temporary disability, the odds ratio, the etiological share of factors in the formation of morbidity (group size: 250 people, experimental group — workers of the main specialties, 95 people — comparison group). Results. According to the research results, the priority factors of occupational health risk include: chemical, noise, heating microclimate, low light level. For certain professions, the share of the contribution of priority factors to the risk profile (PV) reaches 40 %. The indicator of individual occupational risk is 0.12 to 0.26 units. The high level of professional risk (0.22 ÷ 0.26) is characterized by the working conditions of the mechanics for the repair of rolling stock, machine tools (woodworking), casters (metal), thermists, plastic casters. In professional groups with medium and high risk, the indicator of the relative risk of morbidity with temporary disability is higher than 1 (RR = 1.75 and 1.39, respectively), and the etiological share of production factors in the formation of diseases is from 27.95 (subgroup with secondary professional risk) up to 42.88 % (a subgroup with high professional risk), which indicates the professional condition of the disease. Discussion. In general, our data are consistent with the results of similar studies conducted earlier at the car building and car repair enterprises. In order to ensure hygienically safe working conditions and preserve the health of workers, it is necessary to reduce the level of exposure to production factors, including through the introduction of modern equipment and improvement of technological processes.

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