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Impact of complementarity and heterogeneity on health related utility of life

Michał Jakubczyk
Central European Journal of Economic Modelling and Econometrics | 2009 | No 2 | 139-156 | DOI: 10.24425/cejeme.2009.122228
Keywords health related quality of life QALY EQ-5D complementarity heterogeneity
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Abstract

This study aims at identifying determinants of health related quality of life in Poland, and in particular at verifying whether health domains are complements or substitutes and what the impact of heterogeneity of population on the health state valuation is. The paper uses data in panel structure coming from a survey conducted in Poland and consisting of 6700 valuations (after data cleaning) of EQ-5D health states with time trade-off method. Several econometric models are built in order to detect the impact of complementarity and heterogeneity. Random effects models as well as random parameters models estimated using Bayesian approach are used. The results show that health domains are complementary goods. Especially the lack of pain/discomfort is a complement to other health domains. Demographic factors influence how health state change impacts utility. These factors encompass sex, education, respondent’s health state and even belief in life after death.

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Authors and Affiliations

Michał Jakubczyk

The transformation and migration of contaminants during the remediation process of heterogeneous strata by the in-situ thermal conductive heating (TCH) technology: A literature review

Wei Ji Rong-Bing Fu Cai-Hong Gao Jia-Bin Yao
Archives of Environmental Protection | 2023 | vol. 49 | No 1 | 94-102 | DOI: 10.24425/aep.2023.144742
Keywords migration transformation soil remediation heterogeneous strata in-situ thermal desorption
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Abstract

There are currently large quantities of heterogeneous contaminated sites and the in-situ thermal conductive heating (TCH) technology have been widely used in soil remediation. Some engineering cases have shown that when soil remediation of heterogeneous sites use TCH technology, the gases carrying contaminants migrate laterally and contaminate clean areas. However, there are relatively few domestic studies on this phenomenon. Some international scholars have confirmed the occurrence of this phenomenon on the laboratory scale, but have not proposed an effective solution to the above scientific question. This study first introduced the heating mechanism and heating process of TCH. Meanwhile, the forms and transformation mechanism of organic contaminants were fully expounded during soil remediation by TCH. In addition, the formation, migration, accumulation, and lateral diffusion of gaseous contaminants were comprehensively reviewed during the in-situ thermal desorption of heterogeneous strata. Finally, arrangement methods of extraction pipes to effectively capture gas are provided for the heterogeneous contaminated soils remediated by TCH. The results of this study will provide theoretical and technical support for in-depth understanding of steam movement in heterogeneous formations and the remediation of heterogeneous contaminated sites by TCH technology.
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Authors and Affiliations

Wei Ji
1
Rong-Bing Fu
1
Cai-Hong Gao
1
Jia-Bin Yao
1
  1. State Key Laboratory of Pollution Control and Resources Reuse,College of Environmental Science and Engineering, Tongji University, Shanghai 200092, ChinaCentre for Environmental Risk Management and Remediation of Soil and Groundwater,Tongji University, Shanghai 200092, China

Catalyst regeneration techniques in naphtha reforming: Short review

Aviral Gupta S.K. Gupta
Chemical and Process Engineering | 2022 | vol. 43 | No 2 (The International Chemical Engineering Conference 2021 (ICHEEC): 100 Glorious Years of Chemical Engineering and Technology, held from September 16–19, 2021 at Dr B. R. Ambedkar National Institute of Technology, Jalandhar, Punjab, India. Guest editor: Dr Raj Kumar Arya, Dr Anurag Kumar Tiwari) | 101-108 | DOI: 10.24425/cpe.2022.140813
Keywords heterogeneous catalysis regeneration naphtha reforming catalyst reactivation non-linear modelling
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Abstract

Catalytic reforming is an important intermediate in the processing of crude (naphtha in particular) to obtain gasoline. The catalyst used in the process (platinum) is quite expensive and may negatively impact the business if not used judiciously. The aforesaid not only refers to the reduction in loss of the catalyst per unit of gasoline produced but also to the manufacturing of an environmentally friendlier product alongside which is the need of the planet and also a necessity to meet the increasingly strict government norms. In order to meet the above requirements, various refineries around the world use various well-known conventional methods which depend on the quality and quantity of crude manufactured by them.
This paper focuses on highlighting recent advancements in methods of catalytic regeneration (CR) in the reforming unit of petroleum industries to produce high octane gasoline, without any major replacements in their existing setup. Research papers formulated by the application of methodologies involving non-linear models and real-time refinery data have only been considered to avoid any deviations/errors in practical applications. In-depth analysis of these papers has led to the origin of some ideas which have been included as suggestions and can be considered as subjects of further research. In all, the objective of the paper is to serve as a reference for researchers and engineers working on devising optimum methods to improve the regeneration of reforming catalysts.
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Authors and Affiliations

Aviral Gupta
1
S.K. Gupta
1
  1. Harcourt Butler Technical University, Department of Chemical Engineering, Kanpur-208002, India

A Theoretical Review of Topological Organization for Wireless Sensor Network

Sarang Dagajirao Patil Pravin Sahebrao Patil
International Journal of Electronics and Telecommunications | 2021 | vol. 67 | No 3 | 507-515 | DOI: 10.24425/ijet.2021.137840
Keywords clustering algorithms DEBC heterogeneous networks LEACH wireless sensor networks
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Abstract

The recent decades have seen the growth in the fields of wireless communication technologies, which has made it possible to produce components with a rational cost of a few cubic millimeters of volume, called sensors. The collaboration of many of these wireless sensors with a basic base station gives birth to a network of wireless sensors. The latter faces numerous problems related to application requirements and the inadequate abilities of sensor nodes, particularly in terms of energy. In order to integrate the different models describing the characteristics of the nodes of a WSN, this paper presents the topological organization strategies to structure its communication. For large networks, partitioning into sub-networks (clusters) is a technique used to reduce consumption, improve network stability and facilitate scalability.
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Authors and Affiliations

Sarang Dagajirao Patil
1
Pravin Sahebrao Patil
2
  1. NES Gangamai College of Engineering, Nagaon, Dhule, Maharashta, India
  2. Dept. of E&C Engineering SSVPSBSD College of Engineering Dhule, Maharashtra, India

Characterizing The SINR in Poisson Network Using Factorial Moment

Moubachir Madani Fadoul Razali Ngah Alireza Moradi
International Journal of Electronics and Telecommunications | 2019 | vol. 65 | No 4 | 611-617 | DOI: 10.24425/ijet.2019.129820
Keywords Heterogeneous network stochastic geometry factorial moment coverage probability
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Abstract

Usually, cellular networks are modeled by placing each tier (e.g macro, pico and relay nodes) deterministically on a grid. When calculating the metric performances such as coverage probability, these networks are idealized for not considering the interference. Overcoming such limitation by realistic models is much appreciated. This paper considered two- tier twohop cellular network, each tier is consisting of two-hop relay transmission, relay nodes are relaying the message to the users that are in the cell edge. In addition, the locations of the relays, base stations (BSs), and users nodes are modeled as a point process on the plane to study the two hop downlink performance. Then, we obtain a tractable model for the k-coverage probability for the heterogeneous network consisting of the two-tier network. Stochastic geometry and point process theory have deployed to investigate the proposed two-hop scheme. The obtained results demonstrate the effectiveness and analytical tractability to study the heterogeneous performance.

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Authors and Affiliations

Moubachir Madani Fadoul
Razali Ngah
Alireza Moradi

Strain-Hardening Prediction of DP600 Steel Considering the Heterogeneous Deformation Between Ferrite and Martensite

Gou Rui-Bin Dan Wen-Jiao Xu Yong-Sheng Yu Min Li Tong-Jie
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 4 | 1555-1562 | DOI: 10.24425/amm.2023.146222
Keywords Strain-hardening model DP600 GNDs heterogeneous deformation mechanical behaviors
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Abstract

Dual-phase steels have received extensive attention in autobody frame manufacturing due to the resulting characteristics of an interesting combination of ductile ferrite and hard martensite. Moreover, the ductile ferrite and hard martensite lead to heterogeneous deformation in the boundary between the two phases. Then, geometrically necessary dislocations (GNDs) are created to accommodate a lattice mismatch due to the deformation incompatibility of the boundary in straining. In this study, a new empirical GND model is developed, in which the GND density is a function of local plastic deformation; the GND density is distributed in the phase boundary in accordance with an “S” model of material plastic strain. The boundary conditions are applied to define the parameters. The proposed model is verified with DP600 steel. The effects of the GNDs and the width between ferrite and martensite on the strain hardening of DP600 steel are evaluated.
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Authors and Affiliations

Gou Rui-Bin
1
Dan Wen-Jiao
1
Xu Yong-Sheng
2
Yu Min
3
Li Tong-Jie
1
  1. Anhui Science and Technology University, College of Mechanical Engineering, Fengyang 233100, Anhui, China
  2. Shanghai Jiao Tong University, Department of Engineering Mechanics, School of Naval Architecture, Ocean and Civil Engineering, Shanghai 200240, China
  3. Anhui Science and Technology University, College of Architecture, Bengbu 233000, Anhui, China

Dynamic semantic description and search methods for heterogeneous learning resources

Xiaocong Lai Ying Pan Xueling Jiang
Bulletin of the Polish Academy of Sciences Technical Sciences | 2022 | 70 | 3 | e139434 | DOI: 10.24425/bpasts.2021.139434
Keywords heterogeneous data learning resources semantic description semantic search
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Abstract

Learning resources are massive, heterogeneous, and constantly changing. How to find the required resources quickly and accurately has become a very challenging work in the management and sharing of learning resources. According to the characteristics of learning resources, this paper proposes a progressive learning resource description model, which can describe dynamic heterogeneous resource information on a fine-grained level by using information extraction technology, then a semantic annotation algorithm is defined to calculate the semantic of learning resource and add these semantic to the description model. Moreover, a semantic search method is proposed to find the required resources, which calculate the content with the highest similarity to the user query, and then return the results in descending order of similarity. The simulation results show that the method is feasible and effective.
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Authors and Affiliations

Xiaocong Lai
1
Ying Pan
1
Xueling Jiang
1
  1. Guangxi Key Lab of Human-machine Interaction and Intelligent Decision, Nanning Normal University, Nanning 530001, People’s Republic of China

Accounting for Spatial Heterogeneity of Preferences in Discrete Choice Models

Wiktor Budziński Mikołaj Czajkowski
Central European Journal of Economic Modelling and Econometrics | 2021 | No 1 | 1-24 | DOI: 10.24425/cejeme.2021.137353
Keywords discrete choice experiment discrete choice models individual-, region- and population-level parameter estimates spatial preference heterogeneity
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Abstract

There are reasons researchers may be interested in accounting for spatial heterogeneity of preferences, including avoiding model misspecification and the resulting bias, and deriving spatial maps of willingness-to-pay (WTP), which are relevant for policy-making and environmental management. We employ a Monte Carlo simulation of three econometric approaches to account for spatial preference heterogeneity in discrete choice models. The first is based on the analysis of individual-specific estimates of the mixed logit model. The second extends this model to explicitly account for spatial autocorrelation of random parameters, instead of simply conditioning individual-specific estimates on population-level distributions and individuals’ choices. The third is the geographically weighted multinomial logit model, which incorporates spatial dimensions using geographical weights to estimate location-specific choice models. We analyze the performance of these methods in recovering population-, region- and individual-level preference parameter estimates and implied WTP in the case of spatial preference heterogeneity. We find that, although ignoring spatial preference heterogeneity did not significantly bias population-level results of the simple mixed logit model, neither individual-specific estimates nor the geographically weighted multinomial logit model was able to reliably recover the true region- and individual-specific parameters. We show that the spatial mixed logit proposed in this study is promising and outline possibilities for future development.
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Authors and Affiliations

Wiktor Budziński
1
ORCID: ORCID
Mikołaj Czajkowski
1
ORCID: ORCID
  1. University of Warsaw

Fundamental Principles of Rock Fracturing at the Vicinity of Preconditioned Blast hole

Fhatuwani Sengani
Archives of Mining Sciences | 2020 | vol. 65 | No 4 | 769-786 | DOI: 10.24425/ams.2020.134146
Keywords Radial fractures Face-perpendicular preconditioning Heterogeneous rock mass Homogenous rock mass Orientation of radial fractures
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Abstract

A simple empirical study on the orientation, diameter, and extent of radial fractures (long and short) at the vicinity of the face-perpendicular preconditioned boreholes is described. Homogenous and heterogeneous mining faces were considered when studying the orientation of radial fractures, four and five face-perpendicular preconditioning practices were used to investigate the outspread and diameter of radial fractures from one blasted drill hole to another. Long radial fractures were observed to be developed along the direction of the maximum principal stress and short radial fractures were observed to be developed along the direction of the intermediate principal stress in a homogenous mining face. On the other hand, long radial fractures were observed to be developed along the direction of the intermediate principal stress, while short radial fractures were observed to be developed along the direction of the maximum principal stress when the mining faces subjected to heterogeneous rock mass. The diameters of the radial fractures observed were inconsistent and were not nine times the diameter of the original borehole. Furthermore, the extent of radial fractures from one borehole to another was noted to be gradually improved when the additional of preconditioned borehole was in place. This study maintained that the orientation of radial fractures is mostly controlled by the rock properties, however, extend and the diameters of the radial fractures are controlled by rock properties, the effectiveness of the stress wave and gas pressure and brittleness of the rock mass.

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Authors and Affiliations

Fhatuwani Sengani

Analysis of Coverage and Area Spectral Efficiency under Various Design Parameters of Heterogeneous Cellular Network

Anum Abbasi M. Mujtaba Shaikh Safia Amir Dahri Sarfraz Ahmed Soomro Fozia Aijaz Panhwar
International Journal of Electronics and Telecommunications | 2021 | vol. 67 | No 4 | 639-645 | DOI: 10.24425/ijet.2021.137857
Keywords Heterogeneous network Coverage Area Spectral Efficiency 5G Ultra-dense network
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Abstract

As day by day the population is increasing, the use of mobile phones and different applications is increasing which requires high data rate for transmission. Homogeneous cellular network cannot fulfill the demand of mobile users, so creating a heterogeneous cellular network (HCN) is a better choice for higher coverage and capacity to fulfil the increasing demand of upcoming 5G and ultra-dense cellular networks. In this research, the impact of antenna heights and gains under varying pico to macro base stations density ratio from 2G to 5G and beyond on two-tier heterogeneous cellular network has been analyzed for obtaining optimum results of coverage and area spectral efficiency. Furthermore, how the association of UEs affects the coverage and ASE while changing the BSs antenna heights and gains has been explored for the two-tier HCN network model. The simulation results show that by considering the maximum macro BS antenna height, pico BS antenna height equal to user equipment (UE) antenna height and unity gains for both macro and pico tiers, the optimum coverage and area spectral efficiency (ASE) for a two-tier fully loaded heterogeneous cellular network can be obtained.
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Authors and Affiliations

Anum Abbasi
1
M. Mujtaba Shaikh
1
Safia Amir Dahri
1
Sarfraz Ahmed Soomro
1
Fozia Aijaz Panhwar
1
  1. Department of Telecommunication Engineering, Quaid-e-Awam University of Engineering, Science & Technology (QUEST), Nawabshah, Sindh, Pakistan

Fixed fleet open vehicle routing problem: Mathematical model and a modified ant colony optimization

Majid Yousefikhoshbakht Farzad Didehvar Farhad Rahmati Zakir Hussain Ahmed
Bulletin of the Polish Academy of Sciences Technical Sciences | 2024 | 72 | 1 | e148253 | DOI: 10.24425/bpasts.2023.148253
Keywords open vehicle routing problem heterogeneous ant colony optimization combinatorial optimization problems
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Abstract

The fixed fleet heterogeneous open vehicle routing problem (HFFOVRP) is one of the most practical versions of the vehicle routing problem (VRP) defined because the use of rental vehicles reduces the cost of purchasing and routing for shipping companies nowadays. Also, applying a heterogeneous fleet is recommended due to the physical limitations of the streets and efforts to reduce the running costs of these companies. In this paper, a mixed-integer linear programming is proposed for HFFOVRP. Because this problem, like VRP, is related to NP-hard issues, it is not possible to use exact methods to solve real-world problems. Therefore, in this paper, a hybrid algorithm based on the ant colony algorithm called MACO is presented. This algorithm uses only global updating pheromones for a more efficient search of feasible space and considers a minimum value for pheromones on the edges. Also, pheromones of some best solutions obtained so far are updated, based on the quality of the solutions at each iteration, and three local search algorithms are used for the intensification mechanism. This method was tested on several standard instances, and the results were compared with other algorithms. The computational results show that the proposed algorithm performs better than these methods in cost and CPU time. Besides, not only has the algorithm been able to improve the quality of the best-known solutions in nine cases but also the high-quality solutions are obtained for other instances.
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Authors and Affiliations

Majid Yousefikhoshbakht
1
ORCID: ORCID
Farzad Didehvar
2
Farhad Rahmati
2
Zakir Hussain Ahmed
3
  1. Department of Mathematics, Faculty of Sciences, Bu-Ali Sina University, Hamedan, Iran
  2. Department of Mathematics and Computer Science, Amirkabir University of Technology, Tehran, Iran
  3. Department of Mathematics and Statistics, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Kingdom of Saudi Arabia

Change In Microstructure and Mechanical Properties Of Four-Layer Stack ARB Processed Complex Aluminum Sheet with Annealing

Sang-Hyeon Jo Seong-Hee Lee
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 3 | 759-763 | DOI: 10.24425/amm.2021.136377
Keywords accumulative roll bonding heterogeneous microstructure aluminum alloy electron back scatter diffraction annealing
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Abstract

The four-layer stack accumulative roll bonding (ARB) process using AA1050, AA5052 and AA6061 alloy sheets is performed up to 2 cycles without a lubricant at room temperature. The sample fabricated by the ARB is a multi-layer complex aluminum alloy sheet in which the AA1050, AA5052 and AA6061 alloys are alternately stacked to each other. The changes of microstructure and mechanical properties with annealing for the-ARBed aluminum sheet are investigated in detail. The as-ARBed sheet shows an ultrafine grained structure, however the grain diameter is some different depending on the kind of aluminum alloys. The complex aluminum alloy still shows ultrafine structure up to annealing temperature of 250℃, but above 275℃ it exhibits a heterogeneous structure containing both the ultrafine grains and the coarse grains due to an occurrence of discontinuous recrystallization. This change in microstructure with annealing also has an effect on the change of the mechanical properties of the sample. Especially, the specimen annealed at 300℃ represents abnormal values for the strength coefficient K and work hardening exponent n value.
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Authors and Affiliations

Sang-Hyeon Jo
1
ORCID: ORCID
Seong-Hee Lee
1
ORCID: ORCID
  1. Mokpo National University, Advanced Materials Science and Engineering, Muan-Gun, Jeonnam 58554, Korea

Multi–server loss queueing system with random volume customers, non–identical servers and a limited sectorized memory buffer

Marcin Ziółkowski
Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 5 | e146764 | DOI: 10.24425/bpasts.2023.146764
Keywords multi–server queueing system with heterogeneous servers queueing systems with random volume customers sectorized memory buffer loss probability Stieltjes convolution
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Abstract

In the present paper, the model of multi–server queueing system with random volume customers, non–identical (heterogeneous) servers and a sectorized memory buffer has been investigated. In such system, the arriving customers deliver some portions of information of a different type which means that they are additionally characterized by some random volume vector. This multidimensional information is stored in some specific sectors of a limited memory buffer until customer ends his service. In analyzed model, the arrival flow is assumed to be Poissonian, customers’ service times are independent of their volume vectors and exponentially distributed but the service parameters may be different for every server. Obtained results include general formulae for the steady–state number of customers distribution and loss probability. Special cases analysis and some numerical computations are attached as well.
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Authors and Affiliations

Marcin Ziółkowski
1
ORCID: ORCID
  1. Institute of Information Technology, Warsaw University of Life Sciences – SGGW, Poland

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