scholarly journals Phase Transition in Taxi Dynamics and Impact of Ridesharing

2020 ◽  
Vol 54 (1) ◽  
pp. 250-273
Author(s):  
Bo Yang ◽  
Shen Ren ◽  
Erika Fille Legara ◽  
Zengxiang Li ◽  
Edward Y. X. Ong ◽  
...  
Keyword(s):  
Phase Boundary ◽  
Waiting Time ◽  
Road Network ◽  
Supply And Demand ◽  
Optimal Number ◽  
Urban Setting ◽  
The Public ◽  
Average Waiting Time ◽  
Two Phases ◽  
City State

We develop a numerical model using both artificial and empirical inputs to analyse taxi dynamics in an urban setting. More specifically, we quantify how the supply and demand for taxi services, the underlying road network, and the public acceptance of taxi ridesharing (TRS) affect the optimal number of taxis for a particular city and commuters’ average waiting time and trip time. Results reveal certain universal features of the taxi dynamics with real-time taxi booking: that there is a well-defined transition between the oversaturated phase when demand exceeds supply and the undersaturated phase when supply exceeds demand. The boundary between the two phases gives the optimal number of taxis a city should accommodate, given the specific demand, road network, and commuter habits. Adding or removing taxis may affect commuter experience very differently in the two phases revealed. In the oversaturated phase, the average waiting time is exponentially affected, whereas in the undersaturated phase it is affected sublinearly. We analyse various factors that can shift the phase boundary and show that an increased level of acceptance for TRS universally shifts the phase boundary by reducing the number of taxis needed. We discuss some of the useful insights for the benefits and costs of TRS, especially how, under certain situations, TRS not only economically benefits commuters but can also save the shared parties in overall travel time by significantly reducing the time commuters spend on waiting for taxis. Simulations also suggest that elementary artificial taxi systems can capture most of the universal features of the taxi dynamics. We give detailed methodologies of the microscopic simulations we employed. The relevance of the assumptions and the overall methodology are also illustrated using comprehensive empirical road network and taxi demand in the city-state of Singapore.

scholarly journals Estimation of the Efficiency Indices for Operating the Vertical Transportation Systems

2020 ◽  
Author(s):  
Yury K. Belyaev ◽  
Asaf H. Hajiyev
Keyword(s):  
Waiting Time ◽  
Transportation Systems ◽  
Optimal Number ◽  
Control Rule ◽  
Average Waiting Time ◽  
Control Rules

Various lifts’ systems with different control rules are considered. It is suggested to use the efficiency indexes: customer’s average waiting in lift cabin time and average total time, including the time of delivering the customer to the desired floor. Various control rules are introduced: Odd-Even, where one lift serves only customers in Odd floors and other lift only does that in Even floors Up-Down control rule where one lift serves only customers who are going from the first floor to the destination floor 2, 3,…, k; another lift serves customers from the first floor to the upper floor k + 1, k + 2, …, n. The results of simulation, allowing to compare various control rules relatively to the efficiency indexes, are given. It is introduced an optimal number of lifts, which minimizes number of lifts, minimizing a customer’s average waiting time. For some systems, the method of finding the optimal number of lifts, is suggested. Necessary figures demonstrating the operation of the lifts’ systems and the results of the simulation allow to estimate the efficiency indexes.

Mapeamento do Descarte de Medicamentos em um Município do Sul de Minas Gerais/ Mapping and Disposal of Medicines at a Municipality in Southern Minas Gerais

1970 ◽  
Vol 5 (1) ◽  
pp. 35-44
Author(s):  
Daniele Cristina Braz Dos Santos ◽  
Alexandre Magno Batista Machado ◽  
Fábio Vieira Lacerda
Keyword(s):  
Water Resources ◽  
Minas Gerais ◽  
Sectional Study ◽  
Self Medication ◽  
The Public ◽  
Unused Medications ◽  
Ecological Importance ◽  
City State ◽  
Soil Water Resources ◽  
Proper Disposal

Objetivo: O trabalho teve por objetivo mapear, quantificar e verificar a destinação dos medicamentos vencidos e em desuso, e contribuir com uma discussão sobre os problemas gerados com a destinação imprópria desses medicamentos e os impactos causados ao meio ambiente na cidade de Itajubá/MG. Materiais e Métodos: A pesquisa utilizou o método quantitativo de corte transversal, sendo realizada no período de maio a agosto de 2014. Participaram da pesquisa um total de trinta farmácias da cidade de Itajubá. As entrevistas foram realizadas com os responsáveis técnicos das farmácias (farmacêuticos), de forma individual, procurando identificar a forma de manejo e descarte dos fármacos. Do mesmo modo, procurou-se evidenciar como os colaboradores se comportam em relação a importância ecológica do descarte correto e como veem a importância de conscientizar a população. Resultados e Discussão: O consumo de medicamentos vem aumentando expressivamente nas últimas décadas, devido ao estímulo publicitário e à automedicação. Com isso, cada vez mais medicamentos são produzidos e descartados de forma inadequada, o que põe em risco o solo, os recursos hídricos e principalmente, a saúde humana. Por meio dos resultados obtidos pode-se perceber que poucos indivíduos possuem a conscientização do descarte correto dos medicamentos. Conclusão: A falta de colaboração por parte do poder público local em instruir a comunidade pode ser um dos motivos onde ainda existem muitas pessoas desinformadas. Apesar das farmácias estarem implementando um programa de destinação, poucas entendem ou sabem a destinação correta dos resíduos de medicamentos. Palavra-chave: Saúde. Medicamento. Destinação. ABSTRACTObjective: The study aimed to map, quantify and verify the allocation of accrued and unused medications, and contribute to a discussion of the problems created by improper disposal of these medications and the impacts to the environment in the Itajubá city state/MG. Materials and Methods: The research used a cross quantitative sectional study and was conducted in the period May to August 2014.  A total of 30 pharmacies from Itajubá participated. Interviews were conducted with the technical managers of the establishments surveyed, individually, seeking to identify the form of handling and disposal of medications. Similarly, sought to highlight how employees behave towards the ecological importance of proper disposal and how they see the importance to educate the public. Results and Discussion: The consumption of drugs has been increasing significantly in recent decades due to the advertising stimulus and self-medication. With this, more and more medications are produced and discarded improperly, putting the soil, water resources and especially human health at risk. Through the results obtained can be seen that few individuals possess the awareness of proper disposal of medications. Conclusion: The lack of cooperation from the local government to instruct the community can be one of the reasons where there are still many uninformed people. Although pharmacies are implementing a program allocation, few understand or know the proper disposal of waste medicines. Keywords: Health. Medicine. Destination

Summary and conclusions

2018 ◽  
Author(s):  
Thomas F. Babor ◽  
Jonathan Caulkins ◽  
Benedikt Fischer ◽  
David Foxcroft ◽  
Keith Humphreys ◽  
...  
Keyword(s):  
International Organizations ◽  
Drug Policy ◽  
Drug Users ◽  
Illicit Drug ◽  
Supply And Demand ◽  
Unintended Consequences ◽  
Public Health Approach ◽  
Drug Supply ◽  
The Public ◽  
Balanced Approach

Among the 47 options reviewed in this book, most show some evidence of effectiveness in at least one country, but the evidence is less than definitive for many others, either because the interventions are ineffective, or the research is inadequate. Unfortunately, policies that have shown little or no evidence of effectiveness continue to be the preferred options of many countries and international organizations. The evidence reviewed in this book supports two overarching conclusions. First, an integrated and balanced approach to evidence-informed drug policy is more likely to benefit the public good than uncoordinated efforts to reduce drug supply and demand. Second, by shifting the emphasis toward a public health approach, it may be possible to reduce the extent of illicit drug use, prevent the escalation of new epidemics, and avoid the unintended consequences arising from the marginalization of drug users through severe criminal penalties.

scholarly journals The DEA Method and its Application Possibilities for Measuring Efficiency in the Public Sector—The Case of Local Public Employment Services

Economies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 80
Author(s):  
Ewa Cichowicz ◽  
Ewa Rollnik-Sadowska ◽  
Monika Dędys ◽  
Maria Ekes
Keyword(s):  
Labor Market ◽  
Public Sector ◽  
Supply And Demand ◽  
Policy Instruments ◽  
Public Employment ◽  
Employment Services ◽  
The Public ◽  
Measuring Efficiency ◽  
Dea Method ◽  
The Unemployed

Public Employment Services (PES) are identified as important institutions in the process of improving the match between supply and demand in the labor market, which, despite their importance, still do not achieve the desired efficiency. The indicated problem is partly due to the lack of appropriate evaluation methods for the applied labor market policy instruments. This paper aims to verify the possibility of using the two-stage Data Envelopment Analysis (DEA) method in measuring the efficiency of public sector entities. The authors focused on 39 PES operating in Mazovia province, Poland in 2019. In the first stage, the model of technical efficiency of local PES included six variables (four inputs and two outputs). Only seven PES obtained full efficiency. The inefficiency of analyzed PES varied from about 1% to 80%. In the second stage, the attention focuses on the relationship between true unknown efficiency and its determinants (five environmental variables, both demand and supply oriented). Then, the regression coefficients and confidence intervals showed that three out of five variables influence the efficiency results, the share of the long-term unemployed, the share of the unemployed under 30, and the share of the unemployed over 50 in the total number of unemployed.

scholarly journals Analysis of Budget Imbalance Dynamics in Kenya

2018 ◽  
Vol 4 (4) ◽  
pp. 352
Author(s):  
Alex Oguso ◽  
Francis M. Mwega ◽  
Nelson H. Wawire ◽  
Purna Samanta
Keyword(s):  
Public Sector ◽  
Time Series Data ◽  
Supply And Demand ◽  
Series Data ◽  
Fiscal Consolidation ◽  
The Public ◽  
Distributed Lag ◽  
Seeking Behavior ◽  
Development Goals ◽  
The Government

<p><em>Kenya needs substantial and sustained fiscal consolidation to create fiscal space for financing the government’s election pledges, the Vision 2030 development projects, and sustainable development goals. However, the government has found it hard to sustain its fiscal consolidation attempts. This study investigates the fiscal consolidation constraints that act through the budget imbalance dynamics in Kenya using the </em><em>Olivera-Tanzi effect approach.</em><em> The study covers the period 2000-2015</em><em> using time series data and employs three </em><em>Auto-regressive Distributed Lag (ARDL) error correction models</em><em> in the analysis. The study showed that a </em><em>rise in the general price levels in the economy, adjustment of minimum wages, rise</em><em> in perceived levels of corruption in the public sector and the political budget cycles (occurrence of a general election) worsen the budget imbalances (deficits) thus </em><em>constrain fiscal consolidation efforts in Kenya. The study also demonstrated that </em><em>budget imbalance dynamics in Kenya could partly be explained by the Olivera-Tanzi proposition. </em><em>The study rec</em><em>ommends measures to reduce the fiscal imbalance gap in Kenya, which include controlling both supply and demand side inflationary pressure and dealing with rent seeking behavior in the public sector.</em></p>

scholarly journals Analysis of Cutback Management Strategy in Financial Sustainability in the Public Sector in Indonesia

2021 ◽  
Vol 04 (09) ◽  
Author(s):  
Rafiqah Humaira ◽  
Keyword(s):  
Public Sector ◽  
Supply And Demand ◽  
Management Strategies ◽  
Financial Sustainability ◽  
Public Agencies ◽  
The Public ◽  
Study Approach ◽  
Cutback Management ◽  
Directorate General

There are many literature reviews that write about the causes and expected consequences of an environmental, social, and economic crisis. It should be remembered that the role of the public sector is critical to overcoming crises, to promoting sustainable development and to managing the balance between supply and demand for public services. This qualitative research takes a case study approach to public agencies under the Ministry of Finance, namely the Directorate General of Customs and Excise. This study aims to explain financial sustainability in public bodies during the COVID-19 pandemic, and explain cutback management strategies indicated through refocusing carried out by government agencies during the COVID-19 pandemic, as well as explain the relationship between cutback management and financial sustainability which is significantly directly related to the COVID-19 pandemic. The results of the analysis show that there are differences in the financial sustainability of Customs and Excise during the pandemic, namely in terms of state revenues, it certainly changes (decreases) in terms of tax revenues, import duties, and excise. Then identified indicators of cutback strategies at Customs and Excise, and there is a conceptual link between financial sustainability, the COVID-19 pandemic and cutback management strategies.

scholarly journals Optimasi Tingkat Layanan Call Center Jasa Teleponi Dasar: Kajian Regulasi

2019 ◽  
Vol 9 (3) ◽  
pp. 151
Author(s):  
Hendro Purwadi
Keyword(s):  
Waiting Time ◽  
Call Center ◽  
Interactive Voice Response ◽  
Demand Curve ◽  
Comparative Method ◽  
Supply And Demand ◽  
Service Level ◽  
Time Intervals ◽  
Business Approach ◽  
Voice Response

Service level in the call center is calculated based on the number of calls answered during the certain time intervals compared to the total number of calls received. The measurement of service level on the call center operator starts when the caller presses the menu to talk to the  operator on interactive voice response (IVR) menu, and is expressed as a percentage. The higher expected percentage of service level will be higher the needs of operator in the services.  Regulation in Indonesia determines service level for the call center of Basic Telephony Services is in the amount of more than or equal to 90% in 30 seconds. The author uses a business approach to the operational of the call center to analyze existing statutory data. Through the comparative method between operator occupancy and the costs required for the operation of call center using supply and demand curve, the optimum service level value at the call center of Basic Telephony Services can be known, which is 85% in 25 seconds. This means that 85% of incoming calls must be answered by the operator with a maximum waiting time of 25 seconds.

scholarly journals Periodically and quasi-periodically driven dynamics of Bose-Einstein condensates

2020 ◽  
Vol 9 (5) ◽  
Author(s):  
Pengfei Zhang ◽  
Yingfei Gu
Keyword(s):  
Phase Boundary ◽  
Quantum Dynamics ◽  
Scattering Length ◽  
Finite Measure ◽  
Sine Wave ◽  
Square Wave ◽  
Periodically Driven ◽  
Two Phases ◽  
Almost All ◽  
Bose Einstein

We study the quantum dynamics of Bose-Einstein condensates when the scattering length is modulated periodically or quasi-periodically in time within the Bogoliubov framework. For the periodically driven case, we consider two protocols where the modulation is a square-wave or a sine-wave. In both protocols for each fixed momentum, there are heating and non-heating phases, and a phase boundary between them. The two phases are distinguished by whether the number of excited particles grows exponentially or not. For the quasi-periodically driven case, we again consider two protocols: the square-wave quasi-periodicity, where the excitations are generated for almost all parameters as an analog of the Fibonacci-type quasi-crystal; and the sine-wave quasi-periodicity, where there is a finite measure parameter regime for the non-heating phase. We also plot the analogs of the Hofstadter butterfly for both protocols.

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