Wyniki wyszukiwania - BazTech

1

Wykorzystanie sieci Wi-Fi do pasywnej detekcji obiektów

Sorbian Wojciech, Bednarczyk Mariusz

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2025

|

nr 1

3--12

PL

W artykule zostały przedstawione wyniki badań nad możliwością pasywnej detekcji obiektów w pomieszczeniu na podstawie zmian wartości sygnału generowanego przez punkty dostępowe Wi-Fi. W tym celu obserwowano zmiany wartości wskaźnika CSI (Channel State Information), gdy sygnał Wi-Fi był rozpraszany przez poruszające się w pomieszczeniu obiekty. CSI opisuje proces propagacji sygnału radiowego i dlatego zawiera informacje geometryczne na temat przestrzeni, w której odbywa się propagacja. Zatem zrozumienie relacji mapowania między CSI a przestrzennymi parametrami geometrycznymi może stanowić podstawę do ekstrakcji cech i projektowania algorytmów wykrywania ruchu obiektów. W artykule przedstawiono pierwsze badania ukierunkowane na tego typu działania.

EN

The paper presents the results of research on the possibility of passive detection of objects in a room based on changes in the signal value generated by Wi-Fi access points. For this purpose, changes in the CSI (Channel State Information) index value were observed when the Wi-Fi signal was scattered by moving objects in the room. CSI describes the process of radio signal propagation and therefore contains geometric information about the space in which propagation takes place. Therefore, understanding the mapping relationship between CSI and spatial geometric parameters can be the basis for feature extraction and design of algorithms for detecting object movement. The paper presents the first research focused on this type of activity.

2

W kierunku automatyzacji sieci SDN – część 2. Aktualizacja oraz konfiguracja systemu Linux na przełączniku SDN typu bare-metal

Borysiewicz Bogumił, Łubkowski Piotr

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2025

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nr 2

9--13

PL

Sieci programowane komputerowo sukcesywnie wypierają sieci klasyczne. Stoi za tym skalowalność oraz wygoda zarządzania. Nieustannie rozwijane kontrolery SDN umożliwiają implementację coraz to nowszych funkcji. Część z nich dotyczy funkcjonalności pomocnych przy codziennym użytkowaniu tych sieci. Zasadniczą rolą są jednak poprawki administracyjne wpływające na bezpieczeństwo i niezawodność, takie jak wprowadzenie nowych wersji protokołów bezpieczeństwa czy mechanizmów odporności na zakłócenia. Poprawki te wdraża się poprzez wykonanie czystej instalacji nowego systemu operacyjnego przełączników SDN lub aktualizację istniejącego do nowszej wersji. W tym artykule omówione zostaną obie metody wdrażania poprawek, a także konfiguracja poszczególnych funkcji systemu, pozornie prozaicznych, jednak z punktu widzenia administracji oraz inspekcji sieci niezwykle istotnych, jak wykonywanie i przywracanie kopii zapasowej ustawień.

EN

Software-defined networks (SDN) are steadily replacing traditional networks, driven by their scalability and ease of management. Continuously evolving SDN controllers enable the implementation of increasingly advanced features. Some of these features enhance day-to-day network usability. However, the primary focus remains on administrative improvements that impact security and reliability, such as introducing new versions of security protocols and fault-tolerance mechanisms. These improvements are deployed through a clean installation of a new operating system on SDN switches or by updating the existing system to a newer version. This article will discuss both methods of deploying patches, as well as the configuration of various seemingly mundane system functions that are crucial for network administration and inspection, such as performing and restoring configuration backups.

3

A Deep Learning-based Approach for Channel Estimation in Multi-access Multi-antenna Systems

Qasaymeh Mahmoud M., Alqatawneh Ali, Khodeir Mahmoud A., Aljaafreh Ahmad F.

Journal of Telecommunications and Information Technology

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2024

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nr 3

57--64

EN

This paper studies estimating the channel state information at the end of receiver (CSIR) for multiple transmitters communicating with only one receiver so that the latter can decode the incoming signal more efficiently. The transmitters and the receiver are all equipped with multi-antennas and using orthogonal space-time block codes (OSTBC). An algorithm is developed based on deep learning for estimating multi-user multiple-input multiple-output (MU-MIMO) channels. The algorithm could estimate the CSIR using a single pilot block. The proposed convolutional neural network (CNN) architecture designed for this task begins with an input layer that accepts grayscale images, followed by six convolutional blocks for feature extraction and processing. The network concludes with a fully connected layer to output the estimated channel information. It is trained using a regression loss function to map input images to accurate channel information accurately. The performance of the proposed method is compared with classical methods like least square and subspace-based methods, including Capon and rank revealing QR (RRQR) methods. CNN achieved better performance in comparison with the reference. Computer simulations are included to validate the proposed method.

4

A zero-voltage-switching current source inverter with three-stage space vector modulation for low-input voltage stand-alone applications

Fu Xiaofeng, Zhang Mingkang, Ma Dazhuang, Jiang Jiahui, Cai Fenghuang

Archives of Electrical Engineering

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2024

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Vol. 73, nr 4

941--959

EN

In this paper, a three-stage space vector pulse width modulation (SVPWM) along with soft switching is proposed for a high-voltage transfer ratio single-stage three phase current-source inverter (HVTR-CSI) to reduce switching losses and improve inverter efficiency. The proposed SVPWM strategy utilizes the conduction state of the energy storage switch as the zero vector and assigning effective vectors action modes. The zero-voltage-switching (ZVS) of the energy storage switch is achieved by resonant parameters and controlling the turn-on time of the active clamp circuit. The circuit topology, operation principle, high-frequency switching process of the studied CSI are thoroughly analyzed, and detailed calculations of the circuit parameters and soft-switching design are performed. Experimental results on a 1 kW 24 VDC/84 VAC 3-phase AC prototype show that the modulation improves the CSI peak efficiency by 1.15% compared to sinusoidal pulse width modulation (SPWM). This study provides an effective design approach for the HVTR-CSI in terms of reducing switching losses.

5

Expectations of customer as a stakeholder of an agricultural enterprise: case study

Chmielewski Mariusz, Malinowska Ewa

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2023

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z. 173

69--79

EN

Purpose: to present the possibilities of using the CSI (Customer Satisfaction Index) method to manage relations with customers as one of the stages of managing company’s stakeholders. Project/ methodology/ approach: the studies were carried out in two stages. The first stage comprising a direct interview was used to identify the criteria used by the customers of agricultural products when choosing a supplier. In the second stage, after the criteria were grouped with the use of questionnaires, their order of importance was determined. Findings: the method of reaching to the customers used in the study relies on the application of the main criteria that they take into account in their decisions. These are: freshness, flavour, price and appearance of the product. Perception of these criteria is important for the studied entity on account of the specific location of the sales point. Study Limitations/Implications: the proposed method was tested with respect to the selected business entity. In the next stages, it is necessary to test its application in other industries in order to receive a broader range of the picture about perception of key stakeholders by the organisation. The results show critical points to which the company resources should be assigned in order to improve customer satisfaction and loyalty. Practical Implications: the received results may be a prompt for the studied company and may indicate directions of development of stakeholder management, along with the areas that should be improved in this respect. Independent and uniform measurement characteristics of the studied model constitute a useful tool for carrying out a systematic comparative analysis in time. It also provides information about the weak and strong sides of the company in the opinions of its customers. Social Implications: the paper indicates the possibility of reciprocal impact of the main sides of the process: the customer and the company. The studies indicate the possibility of using the CSI method for the first stage of managing the relations with the customers, namely learning the degree of validity of various criteria when purchase decisions are made. Thanks to the use of the CSI method, it is possible to determine an efficient strategy of impact on the customers, using the criteria that are of major importance for them. Originality/Value: the authors made an attempt at using a tool from the realm of the CSI quality management for the process of managing a company’s stakeholders. This is possible by learning the importance of the individual criteria which are guiding the customers’ purchase decisions. This may inspire the companies to use the tool in the process of stakeholder management.

6

The Performance Evaluation of NOMA for 5G Systems Using Automatic Deployment of Multi Users

Suprith P. G., Mohammed Riyaz Ahmed

International Journal of Electronics and Telecommunications

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2022

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Vol. 68, No. 2

337--342

EN

Non-Orthogonal Multiple Access (NOMA) in the fifth generation (5G) system is one of the optimistic technologies for wireless radio access networks. Compared to orthogonal multiple accesses (OMA) reduce the spectral efficiency; NOMA provides the best solution by increasing the data rates. This study evaluates NOMA with a downlink in the automatic deployment of multiusers. The outage performance and ergotic sum-rate gain give the NOMA better performance can be concluded at the final results. NOMA provides the Quality of Service (QoS) to the multi-users by considering the power allocation and data rate factors. Here is considered the outage probability will be 1 when it identifies the different user and allocates the data rate and power.

7

Application of the CSI method to study and improve the quality of internet access service - case study

Molenda Michał

Quality Production Improvement - QPI

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2020

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Vol. 2, Iss. 1

36--43

EN

The paper presents the results of research aimed at assessing the level of satisfaction of individual customers of a company offering Internet access services. The study was conducted using the CSI (Customer Satisfaction Index) method. The study process consisted of 2 stages. The first study conducted in 2017 identified customer requirements and revealed insufficient customer satisfaction with the services provided to date. The analysis of the CSI revealed that customer satisfaction in these areas was not the highest. This state of affairs forced the company to carry out a broad improvement program, which is characterized in this paper. The second study was conducted (in 2019) a year after the implementation of the changes. Owing to this, it was possible to compare customer satisfaction ratings and the customer requirements, as well as to assess the effectiveness of the improvement measures taken. The study allowed to broaden the knowledge about the analyzed service in terms of methods of its measurement and factors having a decisive influence on its quality and efficiency. The service under analysis has been effectively improved.

8

Metoda CSI w badaniu satysfakcji klienta indywidualnego usług ubezpieczeń majątkowych

Przybytniowski Jarosław Wenancjusz

Problemy Jakości

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2019

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R. 51, nr 2

8--16

PL

Głównym problemem opracowania była ocena stopnia satysfakcji klienta indywidualnego z nabycia umowy ubezpieczenia majątkowego. Dążąc do realizacji przyjętego problemu badawczego, zastosowano metodę badania jakości usługi – Wskaźnik Satysfakcji Klienta (CSI). Głównym narzędziem pomiarowym, który zastosowano, był kwestionariusz ankietowy. Badaniem objęto 634 losowo wybranych klientów zamieszkujących w województwie małopolskim, w latach 2013, 2015 i 2017. Otrzymane wyniki pozwoliły na przeprowadzenie szczegółowej analizy związanej z poziomem jakości usługi. Niniejsze opracowanie jest kontynuacją wcześniej prowadzonych i publikowanych badań.

EN

Thus, the main problem of the paper is the evaluation of the satisfaction with property insurance agreement of an individual customer. In order to realize the adopted research problem, the author used a method to research quality service, i.e. CSI Customer Satisfaction Index. A questionnaire was used as the main measurement tool. This method allows us to establish the level of customer satisfaction and to obtain many important hints as to the trends in changes in the activity of property insurance institutions. The results obtained made it possible to conduct an in-depth analysis of service quality. This paper is a continuation of earlier conducted and published studies.

9

Inne metody pomiaru jakości usług transportowych, czyli alternatywy dla metody servqual

Rodzeń A., Stoma M., Dudziak A.

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2018

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z. 130

501--511

EN

Effective and proper management of the quality of transport services allows the use of the latest quality standards, which are the most important and at the same time a key element in the era of constant competition. From a wide range of quality management methods, in this paper special attention has been paid to those that focus on customer satisfaction as a determinant of quality. Critical Incident Technique (CIT) analyzes the sources of customer satisfaction and dissatisfaction. Thanks to the Customer Satisfaction Index (CSI), it is possible to measure and analyze customer satisfaction, while the Importance-Performance technique enables measuring the perception and significance of factors or variables affecting the quality of services from the point of view of buyers.

PL

Efektywne i właściwe zarządzanie jakością usług transportowych umożliwia wykorzystanie najnowszych standardów jakościowych, które są najważniejszym, a zarazem kluczowym elementem w dobie nieustannej konkurencji. Spośród szerokiej gamy metod zarządzania jakością w artykule zwrócono szczególną uwagę na te, które skupiają się na satysfakcji klienta, jako determinancie jakości. Critical Incident Technique (CIT) analizuje źródła satysfakcji, jak i niezadowolenia klientów. Za sprawą Customer Satisfaction Index (CSI) możliwy jest pomiar i analiza satysfakcji klientów, natomiast technika Importance –Performance, umożliwia pomiar postrzegania i istotności czynników, czy zmiennych, wpływających na jakość usług, z punktu widzenia nabywców.

10

Assessment of Customer Satisfaction as an Element Deciding About Enterprise's Competitiveness

Ingaldi M., Kotus M.

Multidisciplinary Aspects of Production Engineering

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2018

|

Vol. 1, Iss. 1

657--664

EN

Enterprises which want to ensure a secure and stable market position must constantly look for ways to convince customers (current and potential) that their goods and services are competitive and represent a sufficiently high level of quality, consistent with the their needs. Service enterprises use specific methods and tools to analyze the quality of their services and to be sure that these services are competitive on the market. One of the important elements of such an analysis is the assessment of customer satisfaction. This research should be treated as a key stage in the customer satisfaction management system. Without knowing the customers' expectations, the enterprise is unable to determine what to improve and correct. In this case, the Customer Satisfaction Index (CSI), which not only indicates what to improve, but also shows the level of customer satisfaction, should be used. The purpose of the paper is to assess customer satisfaction in a service point of a known producer of men's clothes. The CSI index and a specially developed survey were used for the research. The questionnaire was filled in by the customers of the research service point after the service delivery. According to the obtained results, individual determinants should be maintained and monitored by the enterprise. The research also identified areas for improvement, i.e. product quality, design and ways of payment. However, the overall CSI score is good, which means that despite few problems with customers' satisfaction, they are satisfied with the research service point.

11

Corporate social responsibility and corporate social irresponsibility

Stachowicz-Stanusch A., Amann W.

Organizacja i Zarządzanie : kwartalnik naukowy

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2017

|

nr 4

107--115

EN

Expectations for contemporary corporations include not only their conduct in accordance with law and standards but also their social responsibility. However, even incorporation of CSR concept into strategy does not guarantee the absence of socially irresponsible practices. This paper presents a comparison of these two concepts – corporate social responsibility and corporate social irrespinsibility (CSI) – and explains why they are not simply opposing approaches.

12

QoS-based Joint User Selection and Scheduling for MU-MIMO WLANs

Rao D. S., Hency V. D. B.

Journal of Telecommunications and Information Technology

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2017

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nr 4

17--24

EN

The shift in Multi-User Multiple Input Multiple Output (MU-MIMO) has gained attention due to its wide support in very high throughput Wireless Local Area Networks (WLANs) such as the 802.11ac. However, the full advantage of MU-MIMO can be utilized only with proper user selection and scheduling. Also, providing Quality of Service (QoS) support is a major challenge for these wireless networks. Generally, user scheduling is done with the acquisition of Channel State Information (CSI) from all the users. In MU-MIMO based WLANs, the number of CSI request increases with the number of users. This results in an increased CSI overhead and in degradation of the overall throughput. Most of the proposals in the literature have not addressed the contention in the CSI feedback clearly. Hence, in this paper a Joint User Selection and Scheduling (JUSS) scheme is discussed and its performance is evaluated in terms of throughput, delay, packet loss and fairness. In the performance comparison some wellknown Medium Access Control (MAC) protocols are considered. The proposed scheme not only enhances throughput, but also avoids contention during CSI feedback period.

13

A supine cranio-spinal irradiation technique using moving field junctions

Mani K. R., Sapru S., Maria Das K. J., Basu A.

Polish Journal of Medical Physics and Engineering

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2016

|

Vol. 22, Iss. 4

79--83

EN

Aim: To demonstrate a simple technique of cranio-spinal irradiation (CSI) in supine position using inter fraction moving field junctions to feather out any potential hot and cold spots. Materials and Methods: Fifteen patients diagnosed with medulloblastoma were treated during the period February 2011 to June 2015 were included in this study. Out of fifteen patients in the study nine were male and 6 were female with a median age of 13.4 years (range 5-27 years). All the patients were positioned supine on CT simulation, immobilized using thermoplastic mask and aligned using room based laser system. Two parallel opposed lateral fields for the whole brain using an asymmetrical jaw with isocenter at C2 vertebral body. A posterior field also placed to cover the cervical and dorsal field using the same isocenter at C2. The second isocenter was placed at lumbar vertebral region to cover the remaining dorsal, lumbar and sacral region using an inter-fraction moving junction. Field-in-field and enhanced dynamic wedge used to homogeneous dose distribution when required. Results and Discussion: In this study, we found that only two patients failed in the primary site, no radiation myelitis or recurrences in the filed junctions were reported in these fifteen patients with a median follow-up of 36.4 months. The automated sequence of treatment plans with moving junctions in the comfortable supine position negating the need for manual junction matching or junction shifts avoiding potential treatment errors and also facilitating delivery of anesthesia where necessary.

14

Etyka biznesu – przegląd pojęć i koncepcji

Stachowicz-Stanusch A.

Organizacja i Zarządzanie : kwartalnik naukowy

|

2016

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nr 4

81--99

PL

Opracowanie stanowi wyjaśnienie podstawowych pojęć związanych z etyką biznesu, komentowanych szeroko w literaturze przedmiotu, takich jak społeczna odpowiedzialność przedsiębiorstw (corporate social responsibility), społeczna nieodpowiedzialność przedsiębiorstw (corporate social irresponsibility) czy osiągnięcia społeczne przedsiębiorstwa (corporate social performance). W tekście wskazano wzajemne powiązania poszczególnych koncepcji, przedstawiono dotychczasowy dorobek w tym obszarze i nakreślono tło rozważań naukowych w nim prowadzonych.

EN

In the paper there are explained basic notions connected with business ethics such as CSR (corporate social responsibility), CSI (corporate social irresponsibility) and CSP (corporate social performance). The author discusses relations between those concepts, conducts the literature review and shows the theoretical background for the presented discussion.

15

Wykorzystanie metody CSI do badania logistycznej obsługi klienta na przykładzie wybranej organizacji

Zimon D., Kruk U.

Logistyka

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2015

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nr 3

5094--5101, CD 1

PL

Logistyczna obsługa klienta urasta do jednego z ważniejszych aspektów funkcjonowania współczesnych organizacji. Przedsiębiorstwa dysponując zbliżoną technologią oraz infrastrukturą, to właśnie na bazie przewidywania, zaspokajania i wychodzenia naprzeciw wciąż zmieniającym się wymaganiom klientów, budują przewagę konkurencyjną. Odpowiednie zaprojektowanie logistycznej obsługi klienta wymaga od przedsiębiorstw prowadzenia badań dotyczących potrzeb i oczekiwań poszczególnych grup klientów. Celem publikacji jest pomiar logistycznej obsługi klienta za pomocą metody CSI (Customer Satisfaction Index) w wybranej organizacji. Metoda CSI służy do pomiaru zadowolenia klientów i uważana jest za kompleksowy wskaźnik pozwalający połączyć wszystkie niezbędne elementy podstawowej logistycznej obsługi Przeprowadzony proces badawczy pozwolił wyselekcjonować szczególnie ważne aspekty logistycznej obsługi klienta, zaproponować działania doskonalące oraz opracować mapę jakości.

EN

Logistics customer service grows to one of the most important aspects of the functioning of modern organizations. Companies with similar technology and infrastructure are based on prediction, satisfying and meeting the ever-changing demands of our customers, build competitive advantage. Appropriate design of logistics customer service requires enterprises to carry out research on the needs and expectations of the various customer groups. The purpose is to measure the logistics customer service using the method of CSI (Customer Satisfaction Index) in the selected organization. CSI method is used to measure customer satisfaction and is considered a comprehensive index that allows to combine all the elements of logistic service. Conducted primary research process helped select particularly important logistical aspects of customer service, to suggest improvement actions and develop the map quality.

16

The efficiency of integrators of a metallurgic products distribution network

Kramarz M.

Research in Logistics & Production

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2012

|

Vol. 2, No. 3

209-220

EN

Specialization of enterprises in distribution networks realizing processes connected with adaptation of product to specific customer requirements, causes a growing complexity of manufacturing and logistic processes. That is why it is essential for selected enterprises to take over risks associated with co-ordination of processes in so complex systems. The study presented in the article concerns the integrator model in the distribution network which is a prevailing model in the metallurgic products distribution sector. The efficiency of the integrator was examined by means of the the customer satisfaction index (CSI).

17

Skuteczność integratora w sieci dystrybucji z odroczoną produkcją

Kramarz M.

Logistyka

|

2012

|

nr 2

PL

W badaniach zaprezentowanych w artykule za cel postawiono określenie standardów obsługi klienta na przykładzie wybranego integratora sieci dystrybucji wyrobów hutniczych. Założono, że poprawa obsługi klienta zgodnie z preferencjami odbiorców przyczyni się do podniesienia skuteczności integratora sieci. Przybliżono metodykę badań wskazując na znaczenie zapewnienia standardów logistycznej obsługi klienta zróżnicowanych dla poszczególnych segmentów. Jako wskaźnik oceny zadowolenia klienta z poziomu logistycznej obsługi klienta wprowadzono indeks satysfakcji klienta (CSI).

EN

The article is presenting examinations in standards of the logistic customer service. The analysis concerned the fitness of the integrator of the distribution network of steel products. Examinations required introducing to the specificity the distribution network and models of enterprises in network. Fixing standards of the logistic customer service requires the segmentation of customers. Examinations showed that the segmentation according to industries of recipients didn't let for the adaptation of the strategy of services to preferential treatment of the customer. An customer satisfaction index (CSI) was used for the assessment of the level of satisfying the customer.

18

Metody pomiaru satysfakcji klientów bankowych wykorzystywanych do analizy konkurencyjności banków

Snarski P.

Ekonomia i Zarządzanie

|

2012

|

Vol. 4, no. 2

92-108

EN

The study of competitiveness is of particular importance in the case of Polish cooperative banks, which often have small market shares and limited resources. They are forced to operate in conditions of increased competition from financial services market participants. This article aims to present the methods used to measure the satisfaction of retail banks customers. The article presents their classification and description as well as advantages and disadvantages of each applied method.

19

Pomiar satysfakcji klienta w badaniu klientów Poczty Polskiej

Maleszka A., Demska A.

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

|

2004

|

z. 19

193-211

PL

W warunkach ostrej i stale rosnącej konkurencji przedsiębiorstwa starają się poznać obecne i przyszłe potrzeby i oczekiwania klientów. Artykuł prezentuje metodę pomiaru współczynnika satysfakcji klienta (CSI - Customer Satisfaction Index) wykorzystaną przez Pocztę Polską. Metoda umożliwa pomiar zadowolenia z poszczególnych cech usługi, a także pomiar stopnia ważności tych cech. W artykule przedstawiono metodę badawczą, przebieg badania oraz analizę jego wyników. Podobne postępowanie może być przedatne każdemu przedsiębiorstwu, które poprzez orientację na klienta zechce budować swoją przewagę konkurencyjną.

EN

Becouse of strict and growing competition, companies try to meet not only actual but also future customer's needs and expectation's. This article intriduces the method of measurement customer Satisfaction by CSI (Customer Satisfaction Index), which was used by Polish Post Office. This method makes possible the measurement of satisfaction with particular service attributes and the measurement of the degree of importance these attributes. In this article has been performed the method of the examination, the run of the survey and analysis of the scores. This procedure allows companies to see where they stand relative to competition and where to concentrate their efforts to best stay ahead of competition by orientation to customers.