Logistic Type Research Articles

Benchmark of countries’ performance in logistics: An approach based on world bank open data

Logistics which can be considered as the science of planning, implementing and controlling the physical flow of materials and goods from point of origin to point of use to meet customer`s need at a profit has become very important in recent times that it now plays a vital role in companies’ performance as well as the economies of nations. One of the attempts to measure logistics performance at national level is the Logistics Performance Index (LPI) published by the World Bank Group. In fact this study dubbed ”Benchmark of countries’ performance in Logistics – an approach based on World Bank Open Data” argues that there is a close relationship between global competitiveness level of a country and its logistics performance level. It discusses some types of Logistics and also aims to analyze the logistics competitiveness of some countries from a national competitiveness perspective using World Bank Open Data. This work sought to compare Logistics Performance Index (LPI) of Ghana and its region as well as Hungary and its region. Finally, the work made use of international score card where six key dimensions (thus Customs, Infrastructure, International shipments, logistics competitiveness, Tracking & tracing and Timeliness) are applied to benchmark countries' performance and also display their derived overall LPI index to discuss Logistic Performance of Hungary together with that of Ghana.

Dynamics in a discrete time model of logistic type

In this paper, we investigate the qualitative properties and bifurcations of a discrete-time logistic type model for the competitive interaction of two species. Applying polynomial symbolic algebraic theory to deal with complex high-order semi-algebraic systems, and using the bifurcation theory, we give not only the topological structure of the orbits near each fixed point but also the parameter conditions such that the model produces transcritical bifurcation, supercritical (or subcritical) flip bifurcation and supercritical (or subcritical) Neimark-Sacker bifurcation, respectively. Besides, the corresponding mapping is proven to be chaotic in the sense of Marotto. At last, we simulate the stable orbits of period 2 produced from the supercritical flip bifurcation, the stable invariant circle resulting from the Neimark-Sacker bifurcation and the chaos in the sense of Marotto to verify our results.

A Type I Generalized Logistic Distribution: Solving Its Estimation Problems with a Bayesian Approach and Numerical Applications Based on Simulated and Engineering Data

The family of logistic type distributions has been widely studied and applied in the literature. However, certain estimation problems exist in some members of this family. Particularly, the three-parameter type I generalized logistic distribution presents these problems, where the parameter space must be restricted for the existence of their maximum likelihood estimators. In this paper, motivated by the complexities that arise in the inference under the likelihood approach utilizing this distribution, we propose a Bayesian approach to solve these problems. A simulation study is carried out to assess the performance of some posterior distributional characteristics, such as the mean, using Monte Carlo Markov chain methods. To illustrate the potentiality of the Bayesian estimation in the three-parameter type I generalized logistic distribution, we apply the proposed method to real-world data related to the copper metallurgical engineering area.

Positive solutions of Neumann boundary value problems and applications to logistic type population models

Positive solutions of Neumann boundary value problems and applications to logistic type population models

Perceptions, representations and logics of action of urinary incontinence in institutionalised elderly people: a concurrent mixed study protocol

IntroductionUrinary incontinence (UI) is a major public health problem. It affects many institutionalised elderly people. In the literature, the phenomenon is well defined. Its frequency, risk factors, individual and social...

Boundedness and finite-time blow-up in a quasilinear parabolic–elliptic–elliptic attraction–repulsion chemotaxis system

This paper deals with the quasilinear attraction-repulsion chemotaxis system \begin{align*} \begin{cases} u_t=\nabla\cdot \big((u+1)^{m-1}\nabla u -\chi u(u+1)^{p-2}\nabla v +\xi u(u+1)^{q-2}\nabla w\big) +f(u), \\[1.05mm] 0=\Delta v+\alpha u-\beta v, \\[1.05mm] 0=\Delta w+\gamma u-\delta w \end{cases} \end{align*} in a bounded domain $\Omega \subset \mathbb{R}^n$ ($n \in \mathbb{N}$) with smooth boundary $\partial\Omega$, where $m, p, q \in \mathbb{R}$, $\chi, \xi, \alpha, \beta, \gamma, \delta>0$ are constants. Moreover, it is supposed that the function $f$ satisfies $f(u)\equiv0$ in the study of boundedness, whereas, when considering blow-up, it is assumed that $m>0$ and $f$ is a function of logistic type such as $f(u)=\lambda u-\mu u^{\kappa}$ with $\lambda \ge 0$, $\mu>0$ and $\kappa>1$ sufficiently close to~$1$, in the radially symmetric setting. In the case that $\xi=0$ and $f(u) \equiv 0$, global existence and boundedness have been proved under the condition $p<m+\frac2n$. Also, in the case that $m=1$, $p=q=2$ and $f$ is a function of logistic type, finite-time blow-up has been established by assuming $\chi\alpha-\xi\gamma>0$. This paper classifies boundedness and blow-up into the cases $p<q$ and $p>q$ without any condition for the sign of $\chi\alpha-\xi\gamma$ and the case $p=q$ with $\chi\alpha-\xi\gamma<0$ or $\chi\alpha-\xi\gamma>0$.

Investigate the thyroid function of radiation workers and analysis of influence factors

Objective: To analyze the thyroid condition and influencing factors of radiation workers, and to provide scientific basis for radiation protection management. Methods: In April 2020, 4308 radiation workers from October 1, 2017 to September 30, 2019 were collected for occupational health examination in Hangzhou Occupational Disease Prevention and Treatment Hospital, the data included basic information, Thyroid hormone level and thyroid color doppler ultrasound results. The thyroid status of radiation workers in different subgroups was compared. The influencing factors of Thyroid nodule were analyzed by multiple logistic regression. Results: 616 radiation workers had abnormal thyroid gland (14.3%, 616/4308) . The main manifestations of thyroid gland abnormality were abnormal Thyroid nodule (5.1%, 220/4308) and abnormal TSH level (7.1%, 308/4308) . Compared with the male radiation workers, the abnormal rate of Thyroid nodule, T3 and Tsh in female radiation workers was higher (P<0.05) , and the abnormal rate of Thyroid nodule, T3 and T4 increased with the increase of working age (P<0.05) . Radiation Workers in non-rated medical institutions and private medical institutions had the highest detection rate of Thyroid nodule (P<0.05) , and there was no significant difference in thyroid abnormalities among Workers (P<0.05) . By multiple logistic regression analysis, Sex (female) , age and institution type (private) were all independent risk factors for Thyroid nodule (95% CI: 1.548~2.763、1.002~1.030, P<0.05) . Conclusion: Ionizing radiation can cause thyroid damage in radiation workers, so we should pay more attention to the radiation protection management of female, high age, private and district medical organizations, so as to protect the health of radiation workers.

Fourth-party logistics network design under uncertainty environment

A novel fourth-party logistics (4PL) network design problem under uncertainty environment is studied in the current work. Demand uncertainty and two types of disruptions, facility and third-party logistics (3PL) disruptions, are simultaneously considered. To minimize the total cost, a two-stage stochastic programming model is presented, which is further approximated as a mixed-integer linear programming model using the sample average approximation (SAA) method. As a large number of disruption and demand scenarios generated in the approximation process lead to challenges in model solving, the scenario reduction (SR), SAA, dual decomposition and Lagrangian relaxation (DDLR) approaches are integrated to present an SR-DDLRSAA algorithm. The effectiveness of our model and algorithm is illustrated by adopting numerical instances and real-life cases. A comparative analysis indicates that the impact of disruptions on the 4PL network is closely related to the values of the disruption probability and the fluctuation degree of uncertain demand. Furthermore, we extend the proposed basic model by considering demand uncertainty and three types of disruptions, namely supply, facility, and 3PL disruptions, and analyze the impact of supply disruption on the 4PL network.

Impact of Social Determinants of Health on Stereotactic Radiotherapy for Vestibular Schwannoma.

Linear accelerator (LINAC) and Gamma Knife (GK) are common stereotactic radiation therapies for treating vestibular schwannoma (VS). There is currently limited literature examining specific demographic and socioeconomic factors, which influence the type of stereotactic radiation therapy a patient with VS receives. Retrospective database review. The National Cancer Database was queried for cases of VS between 2004 and 2016. Patient demographic characteristics were compared using chi-squared and t-tests between GK and LINAC treated groups. Multivariate regression analysis was performed to assess predictors of stereotactic radiation therapy received. Of the 6,208 included patients, 5,306 (85.5%) received GK and 902 (14.5%) received LINAC. The mean age of GK patients was significantly lower than that of LINAC patients (58.0 vs. 59.7, P< .001). Individuals treated with GK had greater proportions of private insurance (P< .001) and incomes greater than $63,332 (P= .003). A greater proportion of GK patients were treated in academic centers (P< .001), in high-volume facilities (P< .001), in metropolitan areas (P< .001), and in the Northeastern United States (P< .001). On multivariate logistic regression analysis, region, metropolitan area, facility type, tumor size, and distance traveled by patients independently predict receipt of GK versus LINAC. Differences in patient demographics and other social determinants of health influence choice of GK versus LINAC therapy for VS patients. Future studies focused on addressing barriers to care, which may influence postprocedural quality of life and clinical outcomes associated with these two treatments are necessary to better understand the impact of these social differences. 4 Laryngoscope, 132:2232-2240, 2022.

Complexity of Molecular Nets: Topological Approach and Descriptive Statistics

The molecular net complexity (HmolNet) is an extension of the combinatorial complexity (Hmol) of a crystal structure introduced by Krivovichev. It was calculated for a set of 4152 molecular crystal structures with the composition of CxHyOz characterized by the structural class P21/c, Z = 4 (1). The molecular nets were derived from the molecular Voronoi–Dirichlet Polyhedra (VDPmol). The values of the molecular coordination number (CNmol) and critical coordination number (CNcrit) are discussed in relation with the complexity of the crystal structures. A statistical distribution of the set of molecular crystals based on the values of CNmol, CNcrit, and the complexity parameters is obtained. More than a half of the considered structures has CNmol = 14 and CNmol′ = 9 with the Wyckoff set of edges e5dcba. The average multiplicity of intermolecular contacts statistically significantly decreases from 1.58 to 1.51 upon excluding all contacts except those bearing the molecular net. The normalized value of HmolNet is of the logistic distribution type and is distributed near 0.85HmolNet with a small standard deviation. The contribution of Hmol into HmolNet ranges from 35 to 95% (mean 79%, SD 6%), and the subset of bearing intermolecular contacts accounts for 41 to 100% (mean 62%, SD 11%) of the complexity of the full set of intermolecular contacts.

Nonlinear nonlocal reaction-diffusion problem with local reaction

&lt;p style='text-indent:20px;'&gt;In this paper we analyse the asymptotic behaviour of some nonlocal diffusion problems with local reaction term in general metric measure spaces. We find certain classes of nonlinear terms, including logistic type terms, for which solutions are globally defined with initial data in Lebesgue spaces. We prove solutions satisfy maximum and comparison principles and give sign conditions to ensure global asymptotic bounds for large times. We also prove that these problems possess extremal ordered equilibria and solutions, asymptotically, enter in between these equilibria. Finally we give conditions for a unique positive stationary solution that is globally asymptotically stable for nonnegative initial data. A detailed analysis is performed for logistic type nonlinearities. As the model we consider here lack of smoothing effect, important focus is payed along the whole paper on differences in the results with respect to problems with local diffusion, like the Laplacian operator.&lt;/p&gt;

Sustainable Development of Green Reverse Logistics Based on Blockchain.

With the depletion of global resources and the deterioration of the ecological environment, the implementation of green reverse logistics management has become a necessary means. Green reverse logistics is a new type of reverse logistics that aims to improve resource utilization and protect the ecological environment. While promoting sustainable development, “green reverse logistics” also has certain social and economic significance. This paper compared the green reverse logistics system based on blockchain with the current green reverse logistics system. Taking drug recycling as an example, this paper mainly analyzed the waste rate, utilization rate, and enterprise income. The comparison results showed that the efficiency of drug recycling based on blockchain has increased by 20.1% compared with the current stage, and the waste rate has decreased by 16%. The utilization rate has increased by 14%, and corporate income has also increased by 19.5%. It is greatly indicated that green reverse logistics based on blockchain is of great significance to enterprise income and environmental protection, which also produces great social benefits.

Does the Sharing Economy Technology Disrupt Incumbents? Exploring the Influences of Mobile Digital Freight Matching Platforms on Road Freight Logistics Firms

In this paper, we study the disruptive power of the mobile digital sharing economy to the road freight logistics industry. New information technologies, such as the mobile internet, mobile payment methods, and GPS, have enabled platforms to match freight shippers’ demand with carriers’ supply by utilizing the convenience and mobility of smartphones. We empirically study the influence of the emergence of mobile digital freight matching platforms in the U.S. on the profitability and stock performance of two types of incumbent road freight logistics companies: freight arrangement companies (freight forwarders and brokers) and trucking companies (freight carriers). Since the mobile digital freight matching platforms mainly match small and mid‐sized trucking companies with shipping demand, we expect the platforms to introduce interference (direct) competition to traditional freight arrangement companies and exploitation (indirect) competition to large trucking companies, which potentially raises operational challenges for both types of incumbents. We use Difference‐in‐Differences (DID) analyses to study the incumbents’ profitability and the event study method to evaluate their stock performance. We find that after the advent of the mobile digital freight matching platforms in the U.S., the profitability of the traditional freight arrangement companies counter‐intuitively remained unchanged. In contrast, the profitability of the large trucking companies increased. Furthermore, we examine the changes in sales and costs behind these profitability changes. Our dynamic analyses suggest a time lag of the influence of the mobile digital freight matching platforms. Besides, we find that the stock value of the traditional freight arrangement companies received a significant negative shock, whereas the stock value of the large trucking companies showed no significant reaction. This study contributes to understanding the disruptive power of an emerging technology innovation of sharing economy to firm performances in an increasingly competitive and innovative business environment.

Machine Learning Application for Predicting Heart Attacks in Patients from Europe

Even today, there are still a large number of people suffering from heart attacks, which have already claimed numerous lives worldwide. To examine the main components of this problem in an objective and timely manner, we chose to work with a methodology that relies on taking and learning from real and existing data for use in training and testing predictive models. This was carried out to obtain useful data for the present research work. There are in parallel different methodologies that do not quite fit the model of this work. Data was collected from the "Center for Machine Learning and Intelligent Systems" which in turn contains data from patients who have ever suffered a cardiovascular attack and from patients who never suffered the disease, all of them being patients selected from different medical institutions. With the corresponding information, it was subjected to different processes such as cleaning, preparation, and training with the data, to obtain a logistic regression type automatic learning model ready to predict whether or not a person may suffer a cardiovascular attack. Finally, a result of 87% accuracy was obtained for people who suffered a heart attack and an accuracy of 81% for people who would not suffer from this disease. This can greatly reduce the mortality rate due to infarction, by knowing the condition of a person who is unaware of his or her health situation and thus being able to take appropriate measures.

Perioperative trigeminocardiac reflex in patients undergoing surgical treatment of temporomandibular joint ankylosis: A study.

Purpose:The behavior of trigeminocardiac reflex (TCR) is limited to few case reports only in maxillofacial surgery, especially for temporomandibular joint (TMJ) ankylosis cases. The present study aims to find out the incidence of bradycardia due to TCR during intraoperative forceful mouth opening in TMJ ankylosis patients.Materials and Methods:A prospective, unicentric observational study was conducted selecting those patients who were planned for osteoarthrectomy with interpositional gap arthroplasty under general anesthesia. Sixty cases of TMJ ankylosis were randomly selected from December 2018 to-03-2020. Predictor variables were patient age, gender, and type of ankylosis, and outcome variables were pulse rate, mean arterial blood pressure (MABP), and oxygen saturation level (SPO2). Data were recorded at baseline and during intraoperative mouth opening via heister jaw stretcher. A Chi-square test was used for testing the association between variables. P values were considered statistically significant at <0.05.Results:The sample size of 60 subjects has been divided into two age groups (10–19) years and (20–40) years. The mean standard deviation age of the patients was 18.32 ± 6.81 years. About 63.3% were male. Out of 60 cases, 14 patients developed bradycardia. The frequency of bradycardia was found 23.3%. According to logistic regression analysis, age and type of ankylosis were the significant predictors of bradycardia.Conclusion:We conclude that bradycardia due to TCR in TMJ ankylosis patients is not an uncommon entity. Incidences are more prevalent in the age group of 10–19 years and type IV bony ankylosis. Male had a high incidence of bradycardia though P value was nonsignificant.

Тектологічний підхід формування логістичних систем на транспортних і виробничих підприємствах

This work examines the approach to the formation of logistics systems at transport and production enterprises from the point of view of the science of organization - tectology. We will present a possible complete logistics system at the enterprise. All its types are the organization of specific experience with the expediency of their study and the formation of the interconnection of flows, different in content and complexity of individual organization. The logistics system is presented as a set of activities and resistances, and its organization is regulated by such laws as selection and measure. The implementation of these laws has been clarified. Logistics systems at the transport and production enterprise are also considered from the point of view of the organization of business experience in a specific natural-climatic, economic and social environment, as well as a multi-level structure. The structure of the farm system from homogeneous and qualitatively heterogeneous elements is considered. The main features of the Ukrainian economic system in the conditions of a deficit economy with incomplete market saturation are clarified and the main directions for correcting the situation are formulated. On the basis of the different content of flows at enterprises, a complete logistics system with generalized types of logistics is formed: military, economic, mathematical; system-level logistics of functional areas: financial, commercial, informational, service; level of functional areas of commercial logistics: supply, production, sales; logistics at the level of key activities: transport, warehouse, stocks. Logistic objects, as tectological formations of management experience in a specific natural-climatic, economic and social environment, should be presented in their vital, socio-practical sense. At the same time, the experience of the organization should be considered as it really is, as it is given to people in observations.

PECULIARITIES OF THE MODERN DEVELOPMENT OF INTERNATIONAL LOGISTICS IN UKRAINE

The article is devoted to the study of international logistics. It systematizes the main types of logistics depending on the state border: domestic (national), international, global. The conceptual foundations of the development of transport highways, which became prerequisites for the emergence and effective functioning of eurologistics, are outlined. The features of activity of the logistics center of the Paris region and the essence of creation of "freight villages" in the Federal Republic of Germany are highlighted. The system of Pan-European transport corridors, some of which pass through the territory of Ukraine, is analyzed. The problems of the blockade of Ukrainian Black Sea ports by Russian troops, which makes it impossible to use them effectively, are outlined. The insufficient number and area of storage facilities in Ukraine before a full-scale war, much of which has already been destroyed or damaged as a result of hostilities, is highlighted. The introduced "transport visa-free" between the EU and Ukraine is a significant factor supporting the domestic economy in general and logistics in particular.

Design of a new type of logistics handling robot based on STM32

Design of a new type of logistics handling robot based on STM32

Variational inequalities with the logistic type nonlinearities and dependence on the gradient

In this paper, we study the following variational inequality {u ? K, ?Au, v ? u? + ?? g(x,u)(v?u) ? ?? f(x, u,?u)(v?u), ?v ? K, where K = {u ? W1,p 0(?):u(x) ? 0}, A is the p-Laplacian and the function 1 is increasing in the second variable. By constructing the solution operator for an associate variational inequality, we reduce the problem to a fixed point equation. Then, we apply the fixed point index to prove the existence of the nontrivial solution of the problem.

Spectral instability of small-amplitude periodic waves for hyperbolic non-Fickian diffusion advection models with logistic source

A hyperbolic model for diffusion, nonlfnear transport (or advection) and production of a scalar quantity, is considered. The model is based on a constitutive law of Cattaneo-Maxwell type expressing non-Fickian diffusion by means of a relaxation time relation. The production or source term is assumed to be of logistic type. This paper studies the existence and spectral stability properties of spatially periodic traveling wave solutions to this system. It is shown that a family of subcharacteristic periodic waves emerges from a local Hopf bifurcation around a critical value of the wave speed. These waves have bounded fundamental period and small-amplitude. In addition, it is shown that these waves are spectrally unstable as solutions to the hyperbolic system. For that purpose, it is proved that the Floquet spectrum of the linearized operator around a wave can be approximated by a linear operator whose point spectrum intersects the unstable half plane of complex numbers with positive real part.