Andrea M. Maric, Goran J. Radosavljevic, Walter Smetana and Ljiljana D. Zivanov
This paper presents performance comparison of RF inductors with the same lateral geometry applying different substrate configurations. The purpose of presented research is to…
Abstract
Purpose
This paper presents performance comparison of RF inductors with the same lateral geometry applying different substrate configurations. The purpose of presented research is to demonstrate and verify some advantages of low temperature co-fired ceramic (LTCC) technology in comparison to printed circuit board (PCB) technology based on the performance analysis of presented inductors in lower RF range.
Design/methodology/approach
The presented inductors are meander structures fabricated in LTCC and PCB technology, with same line width and outer dimensions. Performance analysis of all configurations is based on measurement results and numerical simulations. Advantage of LTCC technology is demonstrated by application of substrate pattering in order to maintain and/or improve expected inductor performances.
Findings
As expected, obtained results for the inductor with an air-gap show increase of the quality factor over 30 percent and widening of the operating frequency range by 50 percent when compared with the same LTCC structure without a gap. But what is more important the inductor with air-gap embedded inside LTCC stack maintains efficiency when compared to PCB inductor. This fact offers possibility of integration good quality components inside LTCC stack and reduction of used chip space.
Originality/value
Advantages of LTCC with respect to PCB design are demonstrated by efficiency increase of the proposed inductor configurations by means of design optimization relying on substrate pattering and incensement of the packaging density by embedding inductors. The presented findings are verified through consistency of measurement results and simulated data.
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Mirjana S. Damnjanović, Ljiljana D. Živanov, Snezana M. Djurić, Andrea M. Marić, Aleksandar B. Menićanin, Goran J. Radosavljević and Nelu V. Blaž
Significant achievements in ferrite material processing enable developments of many ferrite devices with a wide range of power levels and working frequencies, which make demands…
Abstract
Purpose
Significant achievements in ferrite material processing enable developments of many ferrite devices with a wide range of power levels and working frequencies, which make demands for new characterization and modelling methods for ferrite materials and components. The purpose of this paper is to introduce a modelling and measurement procedure, which can be used for the characterization of two‐port ferrite components in high frequency range.
Design/methodology/approach
This paper presents a commercially available ferrite component (transformer) modelling and determination of its electrical parameters using in‐house developed software. The components are measured and characterized using a vector network analyzer E5071B and adaptation test fixture on PCB board. The parameters of electrical equivalent circuit of the ferrite transformer parameters are compared with values extracted out of measured scattering parameters.
Findings
A good agreement between modelled and extracted electrical parameters of the ferrite transformer is found. The modelled inductance curves have the same dependence versus frequency as extracted ones. That confirms the model validity in the wide frequency range.
Originality/value
In‐house developed software based on proposed model provides inclusion of the ferrite material dispersive characteristics, which dominantly determines high‐frequency behaviour of two‐port ferrite components. Developed software enables fast and accurate calculation of the ferrite transformer electrical parameters and its redesign in order to achieve the best performance for required application.
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Goran J. Radosavljević, Walter Smetana, Andrea M. Marić, Ljiljana D. Živanov, Michael Unger and Günther Stangl
The purpose of this paper is to demonstrate the influence of material properties and fabrication technique on the performance of an embedded pressure sensor. Based on conducted…
Abstract
Purpose
The purpose of this paper is to demonstrate the influence of material properties and fabrication technique on the performance of an embedded pressure sensor. Based on conducted theoretical analysis a suitable material and technological technique that gave the best behavior of designed sensor was chosen for its fabrication. This is verified on the example of a resonant pressure sensor, designed for operation in the MHz range.
Design/methodology/approach
A sensor module is fabricated using the low temperature co‐fired ceramics (LTCC) technology and sputtering technique for electrodes deposition. The module comprises an inductor connected with a variable capacitor formed by the sensor membranes in a parallel LC circuit. An extensive parallel analysis of sensors performance for sensors with thick film (screen‐printed) and thin film (sputtered) electrodes is demonstrated. Mechanical and electrical parameters (Young's modulus and permittivity) of different tape materials that are considered for sensor fabrication are determined at room temperature.
Findings
Implementation of the sputtering technique for deposition of the thin film electrodes and usage of tapes with higher elasticity significantly contribute to the increase of the sensor performance (improved sensitivity) compared to designs found in available literature. Experimentally attained results are compared with the ones obtained by analytical calculations achieving good agreement of obtained results.
Originality/value
The improvement of sensor sensitivity by means of evaluation of different tape material and electrode thickness reduction is demonstrated for the first time. The presented results of the sensor equivalent model and the sensor‐antenna system are in good compliance with experimental data determined through measurement.
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This study aims to review the current research in the digitalization of the humanitarian supply chain performance management (HSCPM) and complement the insights found in the…
Abstract
Purpose
This study aims to review the current research in the digitalization of the humanitarian supply chain performance management (HSCPM) and complement the insights found in the literature with the support of humanitarian organization (HO) reports. As a result, this study also identifies research gaps and directions for future research.
Design/methodology/approach
The study first used a systematic literature review using the Preferred Reporting Items for Systematic Reviews and Meta-Analysis to collect and review 25 peer-reviewed articles. Second, the study complemented the articles’ findings by collecting and analyzing 12 HO reports.
Findings
The study reveals the common understanding and links between HSCPM concepts and digitalization approaches, determining that the digitalization approaches per se used in the literature are indistinct and fragmented. Furthermore, it reveals the gaps between literature and practice that cause the research to develop slowly. Some suggestions are made to aid relevant future research. Both gaps and research directions are presented in Table 5.
Research limitations/implications
This study first contributed to methodology in reviewing the digitalization of HSCPM research from literature and practical perspectives. There is a need to expand the data collection scope, integrate various analyses and foster collaborations with multi-disciplinary researchers and practitioners.
Social implications
This study highlights the gaps and potential pathways for the research community to conduct future research investigations into the digitalization of HSCPM.
Originality/value
To the best of the authors’ knowledge, this is one of the first studies to analyze the HSC’s current research into the application of digitalization in HSCPM from both academic and practical perspectives. It also provides a replicable methodology for future studies.
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This chapter analyzes the recent increase in tourists traveling from Asia to South Central Europe. The work specifically examines the cross cultural communication about religious…
Abstract
This chapter analyzes the recent increase in tourists traveling from Asia to South Central Europe. The work specifically examines the cross cultural communication about religious works of art in popular guidebooks. Since tourism represents a widespread global phenomenon, the guidebook descriptions of religious contents should be objective and accessible for all potential users/tourists, regardless of their cultural, historical, religious, and ethnic background. The analyses of the description of four Catholic cathedrals in South Central Europe in 12 well-known guidebooks demonstrates that the in-depth religious explanations in the literature published in English are minimal and arguably inadequate for the growing Asian market.
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Faezeh Ghaffari, Maryam Shabak, Nima Norouzi and Siyamak Nayyeri Fallah
This study aims at identifying the key perceived environmental attributes that can influence patients’ sense of coherence (SOC) in hospital public spaces and can improve hospital…
Abstract
Purpose
This study aims at identifying the key perceived environmental attributes that can influence patients’ sense of coherence (SOC) in hospital public spaces and can improve hospital quality to create a salutogenic environment.
Design/methodology/approach
In total, 205 patients from the two hospitals in Sari City, Iran, participated in a questionnaire survey. The data were analyzed through structural equation modeling using partial least squares to investigate the impact of environmental qualities of public spaces on patients’ SOC.
Findings
Results confirmed that public spaces’ quality is positively associated with patients’ SOC. Accessibility has the most effective role in patients’ SOC, closely followed by relationability and intelligibility indicators. Environmental comfort also influences patients’ SOC in hospital public spaces. In comparison, the quality of the visibility is less important to patients’ SOC.
Practical implications
Findings will help hospital managers and designers to identify influential factors to improve the quality of health-care environments. Furthermore, the study will provide a picture of patients’ views and SOC intentions regarding public spaces in health-care environments.
Originality/value
To the authors’ knowledge, there is a lack of studies on the relationship between hospital public spaces and users’ SOC. Thus, this study investigates the experiences and perceptions of patients toward the quality of public spaces in hospital environments in physical, social and psychological aspects to find out its effects on patients’ SOC.
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Faezeh Ghaffari, Maryam Shabak, Nima Norouzi and Siyamak Nayyeri Fallah
This study aimed at the identification of perceptional environment properties in hospital public spaces that can affect salutogenic components and patients' overall satisfaction…
Abstract
Purpose
This study aimed at the identification of perceptional environment properties in hospital public spaces that can affect salutogenic components and patients' overall satisfaction and suggested a conceptual framework.
Design/methodology/approach
A systematic review focused on specific steps to clarify the impact of public spaces' environmental quality on patients' satisfaction through the salutogenic approach. Searches were conducted in five databases and four scientific journals.
Findings
Five perceptional environment components of hospital public spaces: physical–psychological comfort, visibility, accessibility, legibility and relationability can be related to three indicators of salutogenic approach: manageability, perception and meaning and can be evaluated in patients' overall satisfaction: desire to use hospital again, to recommend the hospital to others, to prefer hospital to other healthcare environments and to trust in the hospital.
Originality/value
Despite studies on healthcare environments, there is a lack of research on the salutogenic approach in hospital public spaces. Therefore, this paper focuses on the environmental quality in public spaces as an influence on patients' satisfaction with the salutogenic perspective to create a health-promoting environment.