Search results
1 – 10 of 816The purpose of this research paper is to recover the autonomous flight performance of a mini unmanned aerial vehicle (UAV) via stochastically optimizing the wing over certain…
Abstract
Purpose
The purpose of this research paper is to recover the autonomous flight performance of a mini unmanned aerial vehicle (UAV) via stochastically optimizing the wing over certain parameters (i.e. wing taper ratio and wing aspect ratio) while there are lower and upper constraints on these redesign parameters.
Design/methodology/approach
A mini UAV is produced in the Iskenderun Technical University (ISTE) Unmanned Aerial Vehicle Laboratory. Its complete wing can vary passively before the flight with respect to the result of the stochastic redesign of the wing while maximizing autonomous flight performance. Flight control system (FCS) parameters (i.e. gains of longitudinal and lateral proportional-integral-derivative controllers) and wing redesign parameters mentioned before are simultaneously designed to maximize autonomous flight performance index using a certain stochastic optimization strategy named as simultaneous perturbation stochastic approximation (SPSA). Found results are used while composing UAV flight simulations.
Findings
Using stochastic redesign of mini UAV and simultaneously designing mini ISTE UAV over previously mentioned wing parameters and FCS, it obtained a maximum UAV autonomous flight performance.
Research limitations/implications
Permission of the directorate general of civil aviation in the Republic of Türkiye is essential for real-time UAV autonomous flights.
Practical implications
Stochastic redesign of mini UAV and simultaneously designing mini ISTE UAV wing parameters and FCS approach is very useful for improving any mini UAV autonomous flight performance cost index.
Social implications
Stochastic redesign of mini UAV and simultaneously designing mini ISTE UAV wing parameters and FCS approach succeeds confidence, highly improved autonomous flight performance cost index and easy service demands of mini UAV operators.
Originality/value
Creating a new approach to recover autonomous flight performance cost index (e.g. satisfying less settling time and less rise time, less overshoot during flight trajectory tracking) of a mini UAV and composing a novel procedure performing simultaneous mini UAV having passively morphing wing over certain parameters while there are upper and lower constraints and FCS design idea.
Details
Keywords
Yannis Lianopoulos, Nikoleta Kotsi, Thomas Karagiorgos and Nicholas D. Theodorakis
The purpose of the present study was to investigate the interrelationships among the dimensions of sport event experience, event satisfaction and event behavioral intentions.
Abstract
Purpose
The purpose of the present study was to investigate the interrelationships among the dimensions of sport event experience, event satisfaction and event behavioral intentions.
Design/methodology/approach
The sample was comprised of 186 individuals who actively participated in a mass participation sport event. Partial least squares-structural equation modeling (PLS-SEM) was employed to test the relationships among the latent constructs.
Findings
The results indicated that the dimensions of sport event experience predicted 55% of the variance of event satisfaction and 63% of the variance of event behavioral intentions was predicted by sport event experience dimensions and event satisfaction. Specifically, the sensory, affective and relational dimensions of experience sought to have a statistically significant and positive association with event satisfaction, while event satisfaction and the relational dimension of experience were found to have a statistically significant and positive correlation with event behavioral intentions. In addition, event satisfaction was found to mediate the relationships between sensory, affective and relational experiences and event behavioral intentions.
Originality/value
The present study is one of the first that explores the relationships among sport event experience’s dimensions, event satisfaction and positive behavioral intentions in the context of sport event participation.
Details
Keywords
This research study aims to minimize autonomous flight cost and maximize autonomous flight performance of a slung load carrying rotary wing mini unmanned aerial vehicle (i.e. UAV…
Abstract
Purpose
This research study aims to minimize autonomous flight cost and maximize autonomous flight performance of a slung load carrying rotary wing mini unmanned aerial vehicle (i.e. UAV) by stochastically optimizing autonomous flight control system (AFCS) parameters. For minimizing autonomous flight cost and maximizing autonomous flight performance, a stochastic design approach is benefitted over certain parameters (i.e. gains of longitudinal PID controller of a hierarchical autopilot system) meanwhile lower and upper constraints exist on these design parameters.
Design/methodology/approach
A rotary wing mini UAV is produced in drone Laboratory of Iskenderun Technical University. This rotary wing UAV has three blades main rotor, fuselage, landing gear and tail rotor. It is also able to carry slung loads. AFCS variables (i.e. gains of longitudinal PID controller of hierarchical autopilot system) are stochastically optimized to minimize autonomous flight cost capturing rise time, settling time and overshoot during longitudinal flight and to maximize autonomous flight performance. Found outcomes are applied during composing rotary wing mini UAV autonomous flight simulations.
Findings
By using stochastic optimization of AFCS for rotary wing mini UAVs carrying slung loads over previously mentioned gains longitudinal PID controller when there are lower and upper constraints on these variables, a high autonomous performance having rotary wing mini UAV is obtained.
Research limitations/implications
Approval of Directorate General of Civil Aviation in Republic of Türkiye is essential for real-time rotary wing mini UAV autonomous flights.
Practical implications
Stochastic optimization of AFCS for rotary wing mini UAVs carrying slung loads is properly valuable for recovering autonomous flight performance cost of any rotary wing mini UAV.
Originality/value
Establishing a novel procedure for improving autonomous flight performance cost of a rotary wing mini UAV carrying slung loads and introducing a new process performing stochastic optimization of AFCS for rotary wing mini UAVs carrying slung loads meanwhile there exists upper and lower bounds on design variables.
Details
Keywords
Abdul Rashid, Farooq Ahmad, Sarir Ud Din and Shar Zaman
This paper aims to explore the impact of corruption (CP) on income inequality (IN) by considering the size of informal sector (IFS) at different levels of percentiles.
Abstract
Purpose
This paper aims to explore the impact of corruption (CP) on income inequality (IN) by considering the size of informal sector (IFS) at different levels of percentiles.
Design/methodology/approach
This paper uses a panel quantile regression approach for a sample of 50 developing countries. The study also applies panel co-integration (Kao residual co-integration test) in order to examine the long-run relationship between CP and IN.
Findings
This paper using a panel quantile regression approach shows that the high incidence of IFS in an economy marginalizes CP's positive effect because it works as a source of poor peoples' livelihood and skillful individuals. The spread of IFSs in the developing economies may raise earnings among groups and individuals who remain unemployed. Moreover, the results show that CP creates asymmetry in income distribution; fascinatingly, the asymmetric income distribution is high when CP is at higher percentiles.
Research limitations/implications
Due to non-availability of IFS, we restrict our analysis up to 50 developing countries.
Practical implications
CP devastates the effectiveness of institutions over time. Therefore, the government should have to take bold steps to reduce CP in society. Another policy implication of this study is that the government should reduce CP to decrease IN in less developing countries. Moreover, to increase the net base, the authorities need to bring IFS under the umbrella of regulation to avoid inequality in society. In developing economies, a higher part of labor force is related to IFS; therefore, our findings suggest a dire need to reduce labor exploitation in IFS. The policymakers can reduce labor exploitation by reducing the size of IFS, which ultimately reduces IN.
Social implications
On the basis of the authors’ findings, this paper further suggests that it is mandatory for government to reduce CP in order to reduce IN. Moreover, to reduce IN, one needs to reduce the size of IFS.
Originality/value
This study is unique as it is the first that examined the role of IFS in establishing the effect of CP on IN for developing countries at different percentiles.
Details
Keywords
Anurag Mishra, Pankaj Dutta and Naveen Gottipalli
The supply chain (SC) of the fast-moving consumer goods (FMCG) sector in India witnessed a significant change soon after introducing the Goods and Services Tax (GST). With the…
Abstract
Purpose
The supply chain (SC) of the fast-moving consumer goods (FMCG) sector in India witnessed a significant change soon after introducing the Goods and Services Tax (GST). With the initiation of this tax, companies started moving from individual state-wise warehouses to consolidation warehouses model to save costs. This paper proposes a model that frames a mathematical formulation to optimize the distribution network in the downstream SC by considering the complexities of multi-product lines, multi-transport modes and consolidated warehouses.
Design/methodology/approach
The model is designed as mixed-integer linear programming (MILP), and an algorithm is developed that works on the feedback loop mechanism. It optimizes the transportation and warehouses rental costs simultaneously with impact analysis.
Findings
Total cost is primarily influenced by the critical factor transportation price rather than the warehouse rent. The choice of warehouses at prime locations was a trade-off between a lower distribution cost and higher rent tariffs.
Research limitations/implications
The study enables FMCG firms to plan their downstream SC efficiently and to be in line with the recent trend of consolidation of warehouses. The study will help SC managers solve complexities such as multi-product categories, truck selection and consolidation warehouse selection problems and find the optimum value for each.
Originality/value
The issues addressed in the proposed work are transporting products with different sizes and weights, selecting consolidated warehouses, selecting suitable vehicles for transportation and optimizing distance in the distribution network by considering consolidated warehouses.
Details
Keywords
G. Prabhu, Vijyendra Pandey, Sundaramoorthy Jeyavel and Rajgopal Greeshma
Unfortunately, workplace incivility (WI) within the information technology (IT) sector has hardly been covered in extant literature. Therefore, through narratives, this study…
Abstract
Purpose
Unfortunately, workplace incivility (WI) within the information technology (IT) sector has hardly been covered in extant literature. Therefore, through narratives, this study explored various situational and cultural attributes of WI in the Indian IT sector.
Design/methodology/approach
Semi-structured interviews were conducted among the IT professionals (N = 24; Males = 13, Females = 11) aged between 21 and 45 years (Mean = 31.20, SD = 6.56) working in the South Indian state of Karnataka (Bengaluru).
Findings
The narrative thematic analysis yielded the following themes: Experiences of managers' ill-treatment at the workplace, co-workers incivility: dominance in the IT sector and prevalence of gender-based interpersonal discrimination. Furthermore, many sub-themes emerged under each major theme.
Research limitations/implications
Contexts and cultural attributes of WI experiences warrant reconsidering and redefining the concept's theoretical underpinnings, especially from multi-cultural contexts, i.e. India, unlike leading studies in the Western culture. Current study narratives would guide further explorations of how IT professionals wish to curtail these behaviours and suggest strategies to minimize these behaviours in the respective sector.
Originality/value
The findings pose an interesting question for further investigation such as: Do individuals who seek favours from co-workers, under certain conditions, invite the experiences of WI for themselves from potential favour-doer? In a first of its kind, the study also offered relevant insights into exploring whether intentional acts as uncivil behaviours are peculiar to multi-cultural contexts, such as in India.
Details
Keywords
Mitra Khalafbeigi, Farzaneh Yazdani, Florence Genis, Ka Yan Hess and Samita Kirve
Female adults diagnosed with myalgia encephalomyelitis (ME) and chronic fatigue syndrome (CFS) often are marginalised because their condition is not fully recognised by medical…
Abstract
Purpose
Female adults diagnosed with myalgia encephalomyelitis (ME) and chronic fatigue syndrome (CFS) often are marginalised because their condition is not fully recognised by medical and health-care systems. The purpose of this small-scale study was to explore the lived experiences of adult females with ME/CFS in England in relation to contributing factors that impact their occupational participation.
Design/methodology/approach
A qualitative study design using semi-structured interviews was used with nine female adult participants who were selected using a purposive sampling method. A Thematic Networks tool was used to analyse data.
Findings
Four organising themes were identified: impairment-, person-, environment- and society-related factors. Two global themes, invisibility and diagnosis stigma, were identified as the overarching issues that female adults with ME/CFS face in occupational participation.
Originality/value
Many of the issues that contribute to lack of participation by this population are associated with environmental factors which are secondary to their illness.
Details
Keywords
Meghan J. Pifer, Tenisha L. Tevis and Vicki L. Baker
The purpose of this study, nested within a broader study about higher education leadership, was to generate knowledge about the ways in which doctoral education prepared people…
Abstract
Purpose
The purpose of this study, nested within a broader study about higher education leadership, was to generate knowledge about the ways in which doctoral education prepared people for leadership roles in postsecondary institutions within the USA. At colleges and universities, there is an interest in ensuring diverse leadership teams and welcoming campus environments. Yet, the research demonstrates challenges for and underrepresentation among higher education leaders. One point of intervention is doctoral programs in higher education and related fields, given the professional socialization, identity formation and knowledge acquisition that occurs through the doctoral journey.
Design/methodology/approach
By conducting interviews with women who hold doctorates in the field of higher education and who took on new leadership roles at postsecondary institutions in the USA during the global health pandemic, the authors identified specific areas for which doctoral-level training and experiences may be helpful in supporting leader development.
Findings
The authors identified specific areas for which doctoral-level training and experiences may be helpful in supporting leader development. Based on those findings, the authors offer initial propositions about how doctoral programs might support the development of equity-minded leaders in higher education, which should be tested and refined through further research, theory development and application to practice.
Originality/value
This paper contributes by providing a focus on the ways in which doctoral programs can equitably train and develop equity-minded leaders for a range of career goals including but not limited to academic appointments in higher education.
Details