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1 – 10 of 108Gokce Tomrukcu, Hazal Kizildag, Gizem Avgan, Ozlem Dal, Nese Ganic Saglam, Ece Ozdemir and Touraj Ashrafian
This study aims to create an efficient approach to validate building energy simulation models amidst challenges from time-intensive data collection. Emphasizing precision in model…
Abstract
Purpose
This study aims to create an efficient approach to validate building energy simulation models amidst challenges from time-intensive data collection. Emphasizing precision in model calibration through strategic short-term data acquisition, the systematic framework targets critical adjustments using a strategically captured dataset. Leveraging metrics like Mean Bias Error (MBE) and Coefficient of Variation of Root Mean Square Error (CV(RMSE)), this methodology aims to heighten energy efficiency assessment accuracy without lengthy data collection periods.
Design/methodology/approach
A standalone school and a campus facility were selected as case studies. Field investigations enabled precise energy modeling, emphasizing user-dependent parameters and compliance with standards. Simulation outputs were compared to short-term actual measurements, utilizing MBE and CV(RMSE) metrics, focusing on internal temperature and CO2 levels. Energy bills and consumption data were scrutinized to verify natural gas and electricity usage against uncertain parameters.
Findings
Discrepancies between initial simulations and measurements were observed. Following adjustments, the standalone school 1’s average internal temperature increased from 19.5 °C to 21.3 °C, with MBE and CV(RMSE) aiding validation. Campus facilities exhibited complex variations, addressed by accounting for CO2 levels and occupancy patterns, with similar metrics aiding validation. Revisions in lighting and electrical equipment schedules improved electricity consumption predictions. Verification of natural gas usage and monthly error rate calculations refined the simulation model.
Originality/value
This paper tackles Building Energy Simulation validation challenges due to data scarcity and time constraints. It proposes a strategic, short-term data collection method. It uses MBE and CV(RMSE) metrics for a comprehensive evaluation to ensure reliable energy efficiency predictions without extensive data collection.
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Alireza Ansariyar and Milad Tahmasebi
This research paper aims to investigate the effects of gradual deployment of market penetration rates (MPR) of connected vehicles (MPR of CVs) on delay time and fuel consumption.
Abstract
Purpose
This research paper aims to investigate the effects of gradual deployment of market penetration rates (MPR) of connected vehicles (MPR of CVs) on delay time and fuel consumption.
Design/methodology/approach
A real-world origin-destination demand matrix survey was conducted in Boston, MA to identify the number of peak hour passing vehicles in the case study.
Findings
The results showed that as the number of CVs (MPR) in the network increases, the total delay time decreases by an average of 14% and the fuel consumption decreases by an average of 56%, respectively, from scenarios 3 to 15 compared to scenario 2.
Research limitations/implications
The first limitation of this study was considering a small network. The considered network shows a small part of the case study.
Originality/value
This study can be a milestone for future research regarding gradual deployment of CVs’ effects on transport networks. Efficient policy(s) may define based on the results of this network for Brockton transport network.
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Javier Cantillo, Juan Carlos Martin and Concepción Román
The purpose of this investigation is to develop a hybrid fuzzy TOPSIS methodology in order to understand in a practical and integrated way, the consuming and buying behavior of EU…
Abstract
Purpose
The purpose of this investigation is to develop a hybrid fuzzy TOPSIS methodology in order to understand in a practical and integrated way, the consuming and buying behavior of EU residents towards Fishery and Aquaculture Products (FAPs), with an emphasis in the consumption and buying frequency.
Design/methodology/approach
Data were obtained from the Special Eurobarometer Survey (European Union, 2018b), which is a survey of 27,732 EU residents with different socio-demographic characteristics that represent the 28 EU countries. A hybrid fuzzy TOPSIS methodology that synthesizes the consuming and buying behavior of the EU residents toward FAPs was developed.
Findings
The results show that among the countries, Spain has the highest consumption and buying patterns of FAPs, while among the generations it corresponds to the residents born between 1928 and 1945. In addition, there are important differences that depend on the country of residence as well as the generation of the residents. The elasticity analysis evidenced that marketing strategies would have the biggest impact in the countries located in the Central-Eastern zone of the EU and on the generation formed by the people born after 1980.
Originality/value
Although in the literature there are many studies that aimed to understand the behavior of consumers for FAPs, few investigations have focused on analyzing and integrating both the consumption and buying behavior, and to our best knowledge, there are no studies providing a methodology that allow making comparisons between different countries regarding the consumption and buying behavior of FAPs.
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Christos Papaleonidas, Dimitrios V. Lyridis, Alexios Papakostas and Dimitris Antonis Konstantinidis
The purpose of this paper is to improve the tactical planning of the stakeholders of the midstream liquefied natural gas (LNG) supply chain, using an optimisation approach. The…
Abstract
Purpose
The purpose of this paper is to improve the tactical planning of the stakeholders of the midstream liquefied natural gas (LNG) supply chain, using an optimisation approach. The results can contribute to enhance the proactivity on significant investment decisions.
Design/methodology/approach
A decision support tool (DST) is proposed to minimise the operational cost of a fleet of vessels. Mixed integer linear programming (MILP) used to perform contract assignment combined with a genetic algorithm solution are the foundations of the DST. The aforementioned methods present a formulation of the maritime transportation problem from the scope of tramp shipping companies.
Findings
The validation of the DST through a realistic case study illustrates its potential in generating quantitative data about the cost of the midstream LNG supply chain and the annual operations schedule for a fleet of LNG vessels.
Research limitations/implications
The LNG transportation scenarios included assumptions, which were required for resource reasons, such as omission of stochasticity. Notwithstanding the assumptions made, it is to the authors’ belief that the paper meets its objectives as described above.
Practical implications
Potential practitioners may exploit the results to make informed decisions on the operation of LNG vessels, charter rate quotes and/or redeployment of existing fleet.
Originality/value
The research has a novel approach as it combines the creation of practical management tool, with a comprehensive mathematical modelling, for the midstream LNG supply chain. Quantifying future fleet costs is an alternative approach, which may improve the planning procedure of a tramp shipping company.
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Faharuddin Faharuddin, M. Yamin, Andy Mulyana and Y. Yunita
Using cross-sectional household survey data, this paper aims to determine the impact of food price increases on poverty in Indonesia.
Abstract
Purpose
Using cross-sectional household survey data, this paper aims to determine the impact of food price increases on poverty in Indonesia.
Design/methodology/approach
This paper uses the quadratic almost ideal demand system applied to the 2013 Indonesian household survey data. The impact of food price increase on household welfare is calculated using a welfare measure, compensating variation.
Findings
Three food groups with the most outstanding price impact on poverty, rice, vegetables and fish, were studied. The 20% increase in the price of each food group causes an increase in the headcount ratio by 1.360 points (rice), 0.737 points (vegetables) and 0.636 points (fish). Maintaining food price stability for these food groups is very important because the more the price increases, the more the impact on poverty. Food price policies in rural areas are also more critical than in urban areas because the impact of food price increases in rural areas is higher.
Research limitations/implications
This paper does not consider the positive impact of rising food prices on food-producing households.
Practical implications
Implementing appropriate poverty alleviation policies through food policies for main food groups and social protection.
Social implications
Promoting rural development policies and agricultural growth.
Originality/value
This paper contributes to the existing literature by providing empirical results regarding the impact of domestic food prices increase on poverty in Indonesia.
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Salvatore Sciascia, Fernando G. Alberti, Riccardo De Vita and Alberto Poli
One of the main problems of large firms is that they tend to lose their entrepreneurial orientation (EO) once they have grown.The launch of corporate ventures (CV) has been…
Abstract
One of the main problems of large firms is that they tend to lose their entrepreneurial orientation (EO) once they have grown.The launch of corporate ventures (CV) has been adopted by managers, and studied by scholars, as the means to create new businesses within large companies with a low level of EO. Extensive research on CV has been carried out to understand how these projects can effectively lead to new business creation. However, there are no studies on the effect of CV projects on new business creation after the project has ended. More specifically, scholars have overlooked the prospect that a CV project may continue to influence new business creation and how this is possible. This article explores how CV projects have an effect on new business creation after they end, if any.The discussion builds on the analysis of the case study of Riso Gallo, an Italian company operating in the rice industry, which developed a CV project between 1988 and 1996 to sidestep a poor EO.
Zhao Zhang and Xianfeng (Terry) Yang
This study aims to study the connected vehicle (CV) impact on highway operational performance under a mixed CV and regular vehicle (RV) environment.
Abstract
Purpose
This study aims to study the connected vehicle (CV) impact on highway operational performance under a mixed CV and regular vehicle (RV) environment.
Design/methodology/approach
The authors implemented a mixed traffic flow model, along with a CV speed control model, in the simulation environment. According to the different traffic characteristics between CVs and RVs, this research first analyzed how the operation of CVs can affect highway capacity under both one-lane and multi-lane cases. A hypothesis was then made that there shall exist a critical CV penetration rate that can significantly show the benefit of CV to the overall traffic. To prove this concept, this study simulated the mixed traffic pattern under various conditions.
Findings
The results of this research revealed that performing optimal speed control to CVs will concurrently benefit RVs by improving highway capacity. Furthermore, a critical CV penetration rate should exist at a specified traffic demand level, which can significantly reduce the speed difference between RVs and CVs. The results offer effective insight to understand the potential impacts of different CV penetration rates on highway operation performance.
Originality/value
This approach assumes that there shall exist a critical CV penetration rate that can maximize the benefits of CV implementations. CV penetration rate (the proportion of CVs in mixed traffic) is the key factor affecting the impacts of CV on freeway operational performance. The evaluation criteria for freeway operational performance are using average travel time under different given traffic demand patterns.
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Qing Xu, Jiangfeng Wang, Botong Wang and Xuedong Yan
This study aims to propose a speed guidance model of the CV environment to alleviate traffic congestion at intersections and improve traffic efficiency. By introducing the theory…
Abstract
Purpose
This study aims to propose a speed guidance model of the CV environment to alleviate traffic congestion at intersections and improve traffic efficiency. By introducing the theory of moving block section for high-speed train control, a speed guidance model based on the quasi-moving block speed guidance (QMBSG) is proposed to direct platoon including human-driven vehicles and connected vehicles (CV) through the intersection coordinately.
Design/methodology/approach
In this model, the green time of the intersection is divided into multiple block intervals according to the minimal safety headway. Connected vehicles can pass through the intersection by following the block interval using the QMBSG model. The block interval is assigned dynamically according to the traveling relation of HV and CV, when entering the communication range of the intersection. To validate the comprehensive guidance effect of the proposed model, a general evaluation function (GEF) is established. Compared to CVs without speed guidance, the simulation results show that the GEF of QMBSG model has an obvious improvement.
Findings
Compared to CVs without speed guidance, the simulation results show that the GEF of QMBSG model has an obvious improvement. Also, compared to the single intersection speed guidance model, the GEF value of the QMBSG model improves over 17.1%. To further explore the guidance effect, the impact of sensitivity factors of the CVs’ environment, such as intersection environment, communication range and penetration rate (PR) is analyzed. When the PR reaches 75.0%, the GEF value will change suddenly and the model guidance effect will be significantly improved. This paper also analyzes the impact of the length of block interval under different PR and traffic demands. It is found that the proposed model has a better guidance effect when the length of the block section is 2 s, which facilitates traffic congestion alleviation of the intersection in practice.
Originality/value
Based on the aforementioned discussion, the contributions of this paper are three-fold. Based on the traveling information of HV/CV and the signal phase and timing plans, the QMBSG model is proposed to direct platoon consisting of HV and CV through the intersection coordinately, by following the block interval assigned dynamically. Considering comprehensively the indexes of mobility, safety and environment, a GEF is provided to evaluate the guidance effect of vehicles through the intersection. Sensitivity analysis is carried out on the QMBSG model. The key communication and traffic parameters of the CV environment are analyzed, such as path attenuation, PR, etc. Finally, the effect of the length of block interval is explored.
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Akram Hatami, Jan Hermes, Anne Keränen and Pauliina Ulkuniemi
To respond to recent calls for better understanding of the complexities related to happiness management, especially from the employees' perspective, this study examines how…
Abstract
Purpose
To respond to recent calls for better understanding of the complexities related to happiness management, especially from the employees' perspective, this study examines how corporate volunteering (CV), as one form of corporate social responsibility (CSR), creates sustainable happiness in business organizations.
Design/methodology/approach
Theoretical knowledge of CSR and CV as well as the literature on happiness management was examined to form a preliminary understanding of the phenomenon. The empirical section includes a qualitative multiple case study including two company cases of CV in Finland. The data were collected through qualitative interviews. Empirical analysis was made using thematical coding based on existing theory but also by allowing themes to emerge inductively from the data as well.
Findings
The study found that CV enables the emergence of sustainable happiness by allowing individual employee volunteers to transition from individual and rational mindsets to collective and emotional mindsets. A third transition was also identified, a process of change in the volunteers' approach in life that the authors describe as “from actual to potential”.
Originality/value
The study provides a theoretical contribution to the existing literature on happiness management by identifying the third dimension, from actual to potential, and depicting the way this allows employees to move from a state of being to becoming and thus the emergence of sustainable happiness. The study also contributes to existing literature on CV and CSR by revealing the way CV, as a form of practical CSR activity, generates happiness. This study concludes that companies' strategic activities that engage with society can create sustainable happiness for employees who participate. In order to achieve this, volunteering employees should have the chance to reflect on their experience and constant support from managers.
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