sustainable operation
Recently Published Documents





2022 ◽  
Vol 18 (1) ◽  
pp. 1-34
Fan Yang ◽  
Ashok Samraj Thangarajan ◽  
Gowri Sankar Ramachandran ◽  
Wouter Joosen ◽  
Danny Hughes

Battery-free Internet-of-Things devices equipped with energy harvesting hold the promise of extended operational lifetime, reduced maintenance costs, and lower environmental impact. Despite this clear potential, it remains complex to develop applications that deliver sustainable operation in the face of variable energy availability and dynamic energy demands. This article aims to reduce this complexity by introducing AsTAR, an energy-aware task scheduler that automatically adapts task execution rates to match available environmental energy. AsTAR enables the developer to prioritize tasks based upon their importance, energy consumption, or a weighted combination thereof. In contrast to prior approaches, AsTAR is autonomous and self-adaptive, requiring no a priori modeling of the environment or hardware platforms. We evaluate AsTAR based on its capability to efficiently deliver sustainable operation for multiple tasks on heterogeneous platforms under dynamic environmental conditions. Our evaluation shows that (1) comparing to conventional approaches, AsTAR guarantees Sustainability by maintaining a user-defined optimum level of charge, and (2) AsTAR reacts quickly to environmental and platform changes, and achieves Efficiency by allocating all the surplus resources following the developer-specified task priorities. (3) Last, the benefits of AsTAR are achieved with minimal performance overhead in terms of memory, computation, and energy.

2022 ◽  
Vol 14 (2) ◽  
pp. 709
Josef Kunc ◽  
František Križan ◽  
Markéta Novotná ◽  
Kristína Bilková

Shopping centers do not operate in a vacuum but in a society of diverse stakeholders who influence their profit and growth. Therefore, shopping centers management addresses the problem of incorporating social dimensions in their management. The paper aims to identify and evaluate managerial approaches and marketing strategies of shopping centers in the Czech Republic in the context of social dimensions leading to sustainable operation. The research builds methodologically on an online questionnaire survey with top management of shopping centers. It took place at the turn of the years 2019/2020. Out of 88 Czech existing shopping centers, 30 completed responses were received (response rate 34%). The managerial approaches and marketing activities of shopping centers aimed at customers, internal employees, and tenants of the shopping centers were assessed. In addition to profit, the main social aspect on which the management of shopping centers places an emphasis is also loyalty. A properly set working environment and working conditions are essential to achieve higher employee productivity and consequently higher profits. The shopping centers should increase their social roles to preserve the well-being of their employees and enhance customer satisfaction.

2021 ◽  
Vol 6 (01) ◽  
pp. 21-34
Thakur Prasad Bhatta

With the increasing recognition of the need for skilled human resources in developing countries, the role of technical and vocational education and training (TVET) has been an important part of the education system. However, in spite of such a vital role of TVET, challenges exist in designing, planning and implementing it while governing effectively. Such context has raised the issue of governing TVET among educationists, policy makers and all stakeholders to achieve its intended goals. The TVET governing issue has been of serious concern to its stakeholders in Nepal with the introduction of the federal structure in 2015. Hence this paper aims to explore the governing issue of TVET in the context of federal governance of Nepal. For this, this paper employs qualitative research approach in analyzing policy and practice of TVET in Nepal. This paper explores that the process of governing TVET in Nepal has remained highly centralized in spite of rhetoric of decentralization as the main agenda of governing development over the decades. Arguably, there is a reluctant tendency in devolving TVET as per the new structure of federal governance. Instead, conflicts among three levels of governments – federal, provincial and local – are emerging in the case of TVET similar to other development sectors. Hence, for sustainable operation and management of TVET this paper argues that the policy and practice of the TVET need to be guided by the concept of multilevel governance with collaboration among the three levels of government as envisaged by the new federal constitution. 

2021 ◽  
Nikolaos Sariannidis ◽  
Konstantina Ragazou ◽  
Ioannis Passas ◽  
Alexandros Garefalakis

Abstract Supply Chain Management is in the core of businesses’ operational activities worldwide. Its main purpose is the proper management of resources and the assurance of the sustainable operation of the economic entities. However, Supply Chain Management is exposed to breaches related to the code of conduct as well as fraud. Integrating the principles of Environmental, Social and Corporate Governance (ESG) can help build a healthy, sustainable, and resilient supply chain. The purpose of the research is twofold and refers to: (i) highlight those factors of the ESG that contribute to the decrease and mitigation of the fraud in supply chain and (ii) the business strategies that can be developed from businesses and can be based on ESG factors. In this context, a log-log model of multiple linear regression was proposed. Secondary data were extracted from the Thomson Reuters database. The model was based on 681 observations concerning companies operating in Europe. The results have led to the conclusion that the existence of policies related to human resources and technology contribute significantly to tackling supply chain fraud. Regarding the first factor, Human Resource is important to feel safe and their rights should be protected by companies. Securing their rights can lead individuals to their commitment to the work environment, as well as to their protection from threats and violations. Finally, the role of technology is fully consistent with transparency in the supply chain. For this reason, the adoption of reliable solutions and technologies, which turn to the green economy, offer visibility and optimization of processes.

2021 ◽  
Vol 12 (1) ◽  
pp. 30-45
N. A Perminov

Anthropogenic and dynamic impacts on facilities of underground urban infrastructure increase at intensive development of megacities. The unique long-operating underground structures of sewage system require special protection against anthropogenic influence as their wear degree in difficult soil conditions reaches 70 % and more. Therefore, providing structural (mechanical) safety of underground structures of excessive level of danger and responsibility defines sustainable operation and future development of geotechnical infrastructure of the megacity in general. Long-term studying dynamics of changes of technical state of underground sewage structures of the megacity, long operating (for more than 70 years) in soft soils, allowed establishing regularities of influence of intensive anthropogenic and dynamic impacts on this process. For the first time, based on developed continuous models of defective structures potentially dangerous sections have been identified, they are subjected to manifestation of critical failures; ways of their correction are presented. Numerical simulation has defined borders of defectless joint operation of the system “target area - geomassif - underground structure". Scientific substantiation of boundaries of areas with potentially dangerous sections of underground sewage facilities with account of external anthropogenic and dynamic impacts constitutes the basis for elaborating regulations on safe development of geotechnical infrastructure of the historical area of St. Petersburg. The proposed methods of monitoring and protection of geotechnical infrastructure have been successfully used for many years by St. Petersburg Vodokanal in areas of influence of anthropogenic factors and objects under construction on underground structures, they ensure an optimal combination of sustainable operation and development of geotechnical infrastructures of megacities.

2021 ◽  
Vol 13 (23) ◽  
pp. 13470
Pi-Hsia Liang ◽  
Yan-Ping Chi

In the first half of 2020, the average sales volume of gallery operators declined due to the COVID-19 pandemic and art galleries faced a crisis relating to their sustainable operation. However, crypto art finance, which combines online sales with blockchain, is attracting a considerable amount of attention. Can the use of blockchain solve the problems encountered in today’s art trading market? Is it considered acceptable by participants in the art trading market? What factors affect the behavioral intentions of blockchain technology users? In this study, we discussed the relationship between perceived risks and the three external variables of trust, government support, and auction house initiative, as well as their impacts on user attitudes and behavioral intentions regarding blockchain. The results of this study verified key factors that will help to increase the use of blockchain and solve existing market issues. It will also promote the sustainable operation and development of art enterprises and the market.

2021 ◽  
Vol 15 (4) ◽  
pp. 99-107
Oleksii Cherniaiev ◽  
Artem Pavlychenko ◽  
Oleksandr Romanenko ◽  
Yurii Vovk

Purpose. Scientific substantiation of the expedient depth of mining the non-metallic deposits of rocky minerals on the basis of mathematical and statistical methods, which will ensure resource-saving and rational use of natural resources. Methods. To solve the purpose set, the following methods are used: graphical-analytical – when optimizing the maximum depth of mining the deposits of building materials, and the method of mathematical modeling – for determining the maximum depth of mining the non-metallic deposits with internal dumping. By means of statistical processing according to systematized types of deposits, the patterns of a change in the maximum depth of mining the basic deposits, depending on the main parameters of the quarry field, have been studied. Findings. A new methodology, which is distinguished by taking into account in-pit dumping, has been developed for calculating the maximum depth of granite quarries, which most of all influences the efficiency of mining operations and the value of economic indicators while ensuring the maximum economic effect with the achievement of a rational maximum depth of mining the deposit. A new, theoretically substantiated methodology has been created for determining the maximum depth of mining the mineral deposits for the production of crushed-stone products while providing the resource- and land-saving during the quarry operation. Originality. For the first time for these deposits, the dependence of their maximum mining depth on the main parameters of the quarry field and the place of internal dumping of overburden rocks has been determined. This has become a determining factor in the appropriate mining of deep non-metallic deposits of building materials with internal dumping, which provides a minimal land disturbance. Practical implications. The research results have been tested and implemented in working projects for mining the Liubymivske, Chaplynske, Pervomaiske, Mykytivske, Trykratske and Novoukrainske granite deposits; as a result of additional mining of mineral reserves, their additional increment in the volume from 1 to 48 million m3 is possible, which will ensure 5-40 years of sustainable operation of the mining enterprise.

2021 ◽  
pp. 103985622110529
Jeffrey C.L. Looi ◽  
Michelle Atchison ◽  
May Matias ◽  
Pauli Viljakainen

2021 ◽  
Shaon Ray Chaudhuri

The major bottleneck of dairy effluent treatment plant operation is the generation of 10 m3 of nutrient rich wastewater per m3 of milk processed resulting in an annual production of 7.93 tons of carbon dioxide equivalent (CO2 e) gas during treatment in a 7–8 step process. It is an expensive, non-ecofriendly, laborious process which is often not adoptable by the small segment installations. A carefully selected tailor-made bacterial consortium in biofilm reactor within 4 h of incubation in a single step operation under ambient condition could transform the total volume of wastewater into ammonia rich liquid biofertilizer generating 0.79 tons/year CO2 e gas. This biofertilizer replaces the use of fresh water and chemical fertilizer for agriculture, producing economic crops at par with chemical fertilizer. In certain cases, the production of crops is increased substantially over chemical fertilizer based growth. It reduced carbohydrate content of tuber crops. The generated liquid biofertilizer can overcome the shortage in fodder production without using chemical fertilizer and fresh water, hence solving one of the major concerns for sustaining the expansion of dairy industry, hence making dairy effluent treatment plant (ETP) operation an eco-friendly, self-sustainable operation.

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7411
Hong Quang Nguyen ◽  
Minh Thuy Le

In this work toward a sustainable operation of a self-powered wireless sensor, we investigated a multiband Wi-Fi/3G/4G/5G energy harvester based on a novel wideband circularly polarized antenna, a quadplexer, and rectifiers at four corresponding bands. This proposed antenna consisted of four sequentially rotated dual-dipoles, fed by a hybrid feeding network with equal amplitude and an incremental 90° phase delay. The feeding network was composed of three Wilkinson power dividers and Schiffman phase shifters. Based on the sequential rotation method, the antenna obtained a −10 dB reflection coefficient bandwidth of 71.2% from 1.4 GHz to 2.95 GHz and a 3 dB axial ratio (AR) bandwidth of 63.6%, from 1.5 GHz to 2.9 GHz. In addition, this antenna gain was higher than 6 dBi in a wide bandwidth from 1.65 GHz to 2.8 GHz, whereas the peak gain was 9.9 dBi. The quad-band rectifier yielded the maximum AC–DC conversion efficiency of 1.8 GHz and was 60% at −1 dBm input power, 2.1 GHz was 55% at 0 dBm, 2.45 GHz was 55% at −1 dBm, and 2.6 GHz was 54% at 0.5 dBm, respectively. The maximum RF–DC conversion efficiency using the wideband circularly polarized antenna was 27%, 26%, 25.5%, and 27.5% at −6 dBm of input power, respectively.

Sign in / Sign up

Export Citation Format

Share Document