Wyniki wyszukiwania - BazTech

1

Assessing enterprise governance of information technology Maturity Models in Middle East and North Africa region

AlShamy Mostafa M., Abdelmoez Walid M., Elfakharany Essam Eldean, Ammar Hany H.

Annals of Computer Science and Information Systems

|

2021

|

Vol. 26

183--190

EN

Enterprise Governance of IT is an important topic for academics and practitioners in the context of achieving enterprise goals while optimizing resource utilization and risk management. EGIT is playing a critical role in developing countries as resources are rare and risk levels are higher. There is a need for EGIT Maturity Models in Middle East and North Africa (MENA) region detected by delivering and analyzing two questionnaires which were shared with a group of participants working in the field. The obtained results have been generalized and consolidated into a generally applicable requirement list covering the specific needs of MENA region. The results of this paper reveal that although there are some global EGIT MMs used in MENA region which cover some maturity dimensions, there is a lack of easy-to-use integrated multi-dimensional EGIT MMs specific for the region needs.

2

Modeling of a dynamic and intelligent simulator at the infrastructure level of cloud services

Zegrari Faouzia, Idrissi Abdellah

Journal of Automation Mobile Robotics and Intelligent Systems

|

2020

|

Vol. 14, No. 3

65--70

EN

Cloud environments made up of a large number of compute and storage servers provide ondemand services in a usage-based consumption model (pay-as-you-go). Load balancing is one of the major problems in the cloud. Indeed, the dynamics of demand requirements and QoS, as well as the variability of cloud resources and its provisioning models make difficult the operation of performance evaluation of the system. To face this issue and to ensure the viability of cloud computing, IT resources must be managed effectively by a dynamic monitoring of the current workload of virtual machines (VMs). In this study, we propose the design of a cloud services simulation tool at the infrastructure level based on cloud computing simulation platform named CloudSim. It allows real-time monitoring of a load of each VM in terms of CPU utilization, memory utilization and bandwidth utilization ratio. The result of this case study can be useful for carry out dynamic environment simulations for VMs monitoring and fast decision making that can be used in load balancing mechanisms.

3

Optimizing mining production plan as a trade-off between resources utilization and economic targets in underground coal mines

Kopacz Michał, Malinowski Leszek, Kaczmarzewski Sylwester, Kamiński Paweł

Gospodarka Surowcami Mineralnymi

|

2020

|

T. 36, z. 4

49--74

EN

The paper presents multi-criteria optimization method allowing for selection of the best production scenarios in underground coal mines. We discuss here the dilemma between strategies maximizing economic targets and rational resources depletion. Elaborated method combines different geological and mining parameters, structure of the deposit, mine’s infrastructure constrains with economic criteria such as the net present value (NPV), earnings before deducting interest and taxes (EBIT ) and the free cash flows to firm (FCFF). It refers to strategic production planning. Due to implementation of advanced IT software in underground coal mines (digital model, automated production scheduling) we were able to identify millions of scenarios finally reduced to a few – the best ones. The method was developed and tested using data from mine operation “X” (a real project – an example of a coking coal mine located in Poland). The reliability of the method was approved; we were able to identify multiple production scenarios better than the one chosen for implementation in the “X” mine. The final product of the method were rankings of scenarios grouped according to economic decision criteria. The best scenarios reached NP V nearly 50% higher than the Base Case, which held only 52. position out of 60. According to EBIT and FCFF criteria, 10 scenarios achieved results higher than the Base Case, but the percentage differences were very small, below 2 and 4%, respectively. The developed method is of practical importance and can be successfully applied to many other coal projects.

PL

W artykule zaprezentowano wielokryterialną metodę optymalizacji produkcji górniczej, prowadzącą do wyboru najlepszych harmonogramów wydobycia w podziemnych kopalniach węgla kamiennego. Przeprowadzono także dyskusję nad dylematem pomiędzy wyborem strategii maksymalizujących efekty ekonomiczne a racjonalną gospodarką zasobami. Opracowana metoda łączy różne parametry geologiczne i górnicze, budowę złoża, ograniczenia infrastruktury kopalni, z kryteriami ekonomicznym takimi jak NPV, EBIT i FCFF. Tym samym wpisuje się w obszar planowania strategicznego. W związku z wdrożeniem zaawansowanych narzędzi IT w podziemnym górnictwie węglowym (cyfrowy model złoża, zautomatyzowane harmonogramowanie produkcji górniczej) możliwe było zidentyfikowanie milionów scenariuszy, ograniczonych w efekcie końcowym do kilku najlepszych. Metoda została zaprojektowana i przetestowana z wykorzystaniem danych dotyczących projektu górniczego „X” (projekt rzeczywisty – przykład kopalni węgla koksowego zlokalizowanej w Polsce). Jej zastosowanie umożliwiło identyfikację wielu scenariuszy produkcji lepszych od wariantu wybranego do wdrożenia w tej kopalni. Tym samym potwierdzono jej skuteczność. Produkt finalny metody stanowią rankingi scenariuszy zgrupowanych według różnych kryteriów oceny efektywności ekonomicznej. Najlepsze scenariusze osiągnęły wartości NP V blisko 50% wyższe od scenariusza bazowego, który spośród 60 zajął dopiero 52. miejsce. Według kryteriów EBIT i FCFF, 10 scenariuszy osiągnęło wyniki lepsze niż scenariusz bazowy, ale różnice w ujęciu procentowym były jednak bardzo niewielkie, odpowiednio poniżej 2 i 4%. Opracowana metoda ma przede wszystkim praktyczne znaczenie i może być z powodzeniem stosowana w wielu przypadkach projektów węglowych.

4

Pre-concentration of graphite and LiCoO2 in spent lithium-ion batteries using enhanced gravity concentrator

Zhu X,-N., Tao Y.-J., He Y.-Q., Zhang Y., Sun Q.-X.

Physicochemical Problems of Mineral Processing

|

2018

|

Vol. 54, iss. 2

293--299

EN

The pre-concentration of electrode material of spent lithium-ion battery has great significance on the resource utilization and environmental protection. The feasibility of separation of graphite and LiCoO2 based on density difference using the enhanced gravity concentrator was verified in this paper. Combustion characteristics of LiCoO2 and graphite were used to propose a simple evaluation index of separation efficiency. Separation tests were carried out to specify the influence of operating parameters on the separation efficiency. Moreover, the effect of particle size on the separation performance was studied. Combustion characteristics results showed that mass loss of graphite was much greater than that of LiCoO2. Thus, mass loss were used to evaluate the purity of product. Effective separation of graphite and LiCoO2 was achieved by the enhanced centrifugal separator. Separation results showed that increasing centrifugal force decreased the overflow yield and increased the graphite content of the overflow stream. In addition, yield of overflow grew an increase in fluidization water pressure, while the purity of graphite in overflow decreased. The effect of particle size on the separation efficiency was also significant, the separation efficiency decreased with the decreasing of particle size.

5

Optymalizacja wielokryterialna na potrzeby zintegrowanego systemu obsługi trasowania w sieciach sterowanych programowo (SDNRoute)

Boryło P., Chołda P., Jaglarz P., Kantor M., Ludwin W., Rzym G.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

|

2017

|

nr 8-9

733--738, CD

PL

W artykule przedstawiono moduł optymalizacji stanowiący składową systemu obsługi trasowania pakietów w sieciach sterowanych programowo (SDNRoute). Moduł ten współpracując, w nadchodzącym oknie czasowym, z modułem predykcji ruchu dostarcza do sterownika dane dotyczące zalecanego przebiegu przepływów w sieci. Wyniki działania modułu optymalizacji są przekazywane do emulatora, który weryfikuje ich jakość przed zastosowaniem w sieci rzeczywistej. Ze względu na fakt, że moduł optymalizacji uwzględnia kilka kryteriów minimalizacji: użycia zasobów, opóźnień oraz konsumpcji energii, sformułowano zadanie optymalizacji wielokryterialnej oraz przedstawiono sposób postępowania w zakresie prowadzenia obliczeń.

EN

An optimization module, which is an element of an integrated system supporting routing in software defined networks (SDNRoute), is presented. The module cooperates with a traffic prediction module providing data related to the next time window. The optimization module feeds traffic flow routing data to a system controller, as well as to an emulator used for experimental evaluation of the optimization results before they are applied in the production network. Due to the fact that the optimization module assumes a few minimized goal functions (resource utilization, delays, and energy consumption), an optimization task is formulated and the method to carry data processing is given.

6

Memory resources in hardware implementations of BLAKE and BLAKE2 hash algorithms

Sugier J.

Journal of Polish Safety and Reliability Association

|

2017

|

Vol. 8, No. 1

119--128

EN

In contemporary computer systems security issues are very important for both safety and reliability reasons thus application of appropriate cryptographic methods is a necessity in system design and maintenance. This paper deals with one such method – BLAKE hash function – and investigates its implementation in hardware. The algorithm was a candidate proposed for the SHA-3 contest and, although it was not selected in the final round as the winner, it was very well received for its cryptographic strength and performance, being still used as a hash method of choice in contemporary IT systems. In this paper we discuss a specific modification in hardware realizations of the function which eliminates need for involved data paths distributing message bits among the round units by using auxiliary memory modules for repetitive storage of the message inside each round instance. The idea was implemented in realizations of both BLAKE and BLAKE2 versions of the algorithm in four different organizations: the standard iterative one and three high-speed loop-unrolled architectures with 2, 4 and 5 rounds instantiated in hardware. Together with standard (without RAM) implementations this produced a total of 16 test cases: after implementation in a popular Spartan-3 device from Xilinx their parameters allowed for exhaustive evaluation of the proposed modification. The results reveal that the modification outstandingly enhances size of all the tested architectures: on average, occupation of the FPGA array is reduced at least by half while the improvements in speed, although not so spectacular, are also visible. Additional analyses indicate that the method can also increase overall efficiency of routing, helps in implementation of the loop-unrolled architectures and strengthens optimizations introduced by the BLAKE2 version of the algorithm.

7

Projekt zagospodarowania złoża podstawą dla kompleksowej i racjonalnej gospodarki zasobami kopalin

Uberman R., Naworyta W.

Górnictwo Odkrywkowe

|

2014

|

R. 55, nr 2-3

5--10

PL

W artykule przedstawiono wybrane zagadnienia związane z opracowaniem projektu zagospodarowania złoża dla eksploatacji złóż kopalin metodą odkrywkową. Poddano pod dyskusję problem okonturowania złoża jako kompromis pomiędzy pełnym wykorzystaniem zasobów bilansowych, a minimalizacją kosztów zdejmowania nadkładu. Podkreślono znaczenie właściwego doboru technologii wydobycia dla racjonalnego wykorzystania zasobów. Omówiono zagadnienie wykorzystania kopalin towarzyszących. Wymieniono wybrane metody modelowania złóż pod kątem projektowania górniczego. Przedstawiono znaczenie zagadnień środowiskowych w projektach zagospodarowania złoża, a także problem oceny oddziaływania eksploatacji na środowisko. W podsumowaniu podkreślono znaczenie oceny ekonomicznej projektowanej eksploatacji.

EN

The selected issues connected to the elaboration offeasibility study for open cast mines have been presented in the paper. The problem of open pit contours, as a compromise between full extraction of reserves and minimization of the costs of overburden removal, has been discussed. The importance of the proper choice of the exploitation technology for rational utilization of reserves has been stressed. The problem of utilization of accompanying minerals has been described. The selected modeling methods useful in the process offeasibility study elaboration have been mentioned. The importance of environmental issues in feasibility study, as well as problem of environmental impact assessment for future exploitation, has been stressed.

8

Enhance performance of web proxy cache cluster using cloud computing

Alsaiari N. O., Fayoumi A. G.

Advances in Science and Technology. Research Journal

|

2013

|

Vol. 7, nr 20

2--10

EN

Web caching is a crucial technology in Internet because it represents an effective means for reducing bandwidth demands, improving web server availability and reducing network latencies. However, Web cache cluster, which is a potent solution to enhance web cache system’s capability, still, has limited capacity and cannot handle tremendous high workload. Maximizing resource utilization and system capability is a very important problem in Web cache cluster. This problem cannot be solved efficiently by merely using load balancing strategies. Thus, along with the advent of cloud computing, we can use cloud based proxies to achieve outstanding performance and higher resource efficiency, compared to traditional Web proxy cache clusters. In this paper, we propose an architecture for cloud based Web proxy cache cluster (CBWPCC) and test the effectiveness of the proposed architecture, compared with traditional one in term of response time ,resource utilization using CloudSim tool.

9

Efekty wykorzystania biomasy w PEC Lubań Sp. z o.o. w latach 1999 – 2011

Kowalczyk K.

Instal

|

2012

|

nr 10

32-37

PL

PEC Lubań od 12 lat eksploatuje system ciepłowniczy zasilany w około 30% ciepłem ze spalania słomy. Wdrażanie zastosowań słomy i innej biomasy na szerszą skalę jako paliwa w ciepłownictwie hamowane jest przez niedoskonały system bodźców. Zastosowanie biomasy w przedsiębiorstwie energetycznym generuje nowy obszar działalności gospodarczej. Obszar ten może stanowić podstawę do optymalizacji wykorzystania zasobów i zmiany struktury kosztów produkcji podstawowej.

EN

Since 12 years PEC Lubań operates the heat district system powered with 30% of heat from combustion of straw. The implementation of straw or other biomass usage on a large scale as fuel in district heating is hampered by imperfect system of incentives. The use of biomass in energy company generates a new area of business. This area may provide a basis for optimizing use of resources and changes in the structure of costs of primary production.