Balancing the Tradeoff between Profit and Fairness in Rideshare Platforms During High-Demand Hours

Rideshare platforms, when assigning requests to drivers, tend to maximize profit for the system and/or minimize waiting time for riders. Such platforms can exacerbate biases that drivers may have over certain types of requests. We consider the case of peak hours when the demand for rides is more than the supply of drivers. Drivers are well aware of their advantage during the peak hours and can choose to be selective about which rides to accept. Moreover, if in such a scenario, the assignment of requests to drivers (by the platform) is made only to maximize profit and/or minimize wait time for riders, requests of a certain type (e.g. from a non-popular pickup location, or to a non-popular drop-off location) might never be assigned to a driver. Such a system can be highly unfair to riders. However, increasing fairness might come at a cost of the overall profit made by the rideshare platform. To balance these conflicting goals, we present a flexible, non-adaptive algorithm, \lpalg, that allows the platform designer to control the profit and fairness of the system via parameters $\alpha$ and $\beta$ respectively. We model the matching problem as an online bipartite matching where the set of drivers is offline and requests arrive online. Upon the arrival of a request, we use \lpalg to assign it to a driver (the driver might then choose to accept or reject it) or reject the request. We formalize the measures of profit and fairness in our setting and show that by using \lpalg, the competitive ratios for profit and fairness measures would be no worse than $\alpha/e$ and $\beta/e$ respectively. Extensive experimental results on both real-world and synthetic datasets confirm the validity of our theoretical lower bounds. Additionally, they show that \lpalg under some choice of $(\alpha, \beta)$ can beat two natural heuristics, Greedy and Uniform, on \emph{both} fairness and profit

Applying Value Creation Framework to Offer Public Transport Improvement

Public Transportation in urban areas is expected to be main choice for people's mobility. The aim of this research is apply value creation framework based on S-D Logic and Trans Jogja from Yogyakarta and Värmlandstrafik AB Sweden are the case study. This research use direct observation and interview to the related person/ company as the primary data, and to support them use group discussion with the users. This research also use secondary data from some journals, reports, documentations, etc. From the analysis and discussion Värmlandstrafik AB is address the value creation service and opportunity more than Trans Jogja. From conclusion, the need of applying value creation framework in Trans Jogja is to offer public transport improvement as has been illustrated by Trans Jogja. Although the achievement of value creation opportunities are not as high as that achieved by Värmlandstrafik AB, but Trans Jogja should learn about what needs should be improved

Topological Signals of Singularities in Ricci Flow

We implement methods from computational homology to obtain a topological signal of singularity formation in a selection of geometries evolved numerically by Ricci flow. Our approach, based on persistent homology, produces precise, quantitative measures describing the behavior of an entire collection of data across a discrete sample of times. We analyze the topological signals of geometric criticality obtained numerically from the application of persistent homology to models manifesting singularities under Ricci flow. The results we obtain for these numerical models suggest that the topological signals distinguish global singularity formation (collapse to a round point) from local singularity formation (neckpinch). Finally, we discuss the interpretation and implication of these results and future applications.Comment: 24 pages, 14 figure

Geo-location oriented routing protocol for smart dynamic mesh network

© 2016 IEEE. Wireless Mesh Network is an emerging technology with great potential to become a Self-Sustained Network. Unlike the traditional networks that dominate the current communication system and rely on a large and expensive setup of wired/wireless access points to provide connection between users, the Wireless Mesh Network is formed by the user devices (referred as Nodes) which connect to each other to form a network. However, due to the use of legacy/traditional network models for mesh networks, there exist various limitations towards its implementation. This paper presents a new approach towards the Wireless Mesh Network, incorporating a new routing scheme based on the Geo-Location of the devices. It puts forward the structure, working principle and its performance during the first implementation

Spectral features in isolated neutron stars induced by inhomogeneous surface temperatures

The thermal X-ray spectra of several isolated neutron stars display deviations from a pure blackbody. The accurate physical interpretation of these spectral features bears profound implications for our understanding of the atmospheric composition, magnetic field strength and topology, and equation of state of dense matter. With specific details varying from source to source, common explanations for the features have ranged from atomic transitions in the magnetized atmospheres or condensed surface, to cyclotron lines generated in a hot ionized layer near the surface. Here we quantitatively evaluate the X-ray spectral distortions induced by inhomogeneous temperature distributions of the neutron star surface. To this aim, we explore several surface temperature distributions, we simulate their corresponding general relativistic X-ray spectra (assuming an isotropic, blackbody emission), and fit the latter with a single blackbody model. We find that, in some cases, the presence of a spurious 'spectral line' is required at a high significance level in order to obtain statistically acceptable fits, with central energy and equivalent width similar to the values typically observed. We also perform a fit to a specific object, RX J0806.4-4123, finding several surface temperature distributions able to model the observed spectrum. The explored effect is unlikely to work in all sources with detected lines, but in some cases it can indeed be responsible for the appearance of such lines. Our results enforce the idea that surface temperature anisotropy can be an important factor that should be considered and explored also in combination with more sophisticated emission models like atmospheres.Comment: 11 pages, 7 figures; accepted for publication in MNRA

Analisis Pengaruh Permodalan, Penyaluran Dana, Diversifikasi Pendapatan, NIM dan Risiko Kredit terhadap Kinerja Keuangan Perbankan (Studi Empiris BUSN yang terdaftar di BEI periode 2012-2015)

This research is about analyze the effect of capital (Capital Adequacy Ratio), distribution of funds (Loan to Deposit Ratio), income diversification (HHIDIV), Net Interest Margin, and credit risk (Non Performing Loan) to Financial Performance with Proxy Profitability (ROA) . Population used object in this research is Private National Bank both Foreign Exchange and Non Foreign Exchange listed on Indonesia Stock Exchange (BEI) period 2012-2015. The financial performance proxied by ROA at National Private Banks decreased during the research period, then the variables that were suspected to be factors affecting ROA had an inconsistent influence. In this study using the dependent variable is ROA while the independent variables used are CAR, LDR, HHIDIV, NIM and NPL. The method of analysis in this study using multiple linear regression using SPSS21. The result of the research shows that NIM and NPL have significant influence to financial performance of BUSN, NIM has positive and significant influence to financial performance of BUSN (ROA), while credit risk (NPL) has a negative and significant effect to financial performance of BUSN (ROA). Then the CAR, LDR and HHIDIV variables have no significant effect on the financial performance of BUSN (ROA). The predicted ability of these five independent variables on ROA in this study amounted to 50.7% while the remaining 49.3% influenced by other variables not included in this study

Time for pulse traversal through slabs of dispersive and negative (ϵ\epsilon, μ\mu) materials

The traversal times for an electromagnetic pulse traversing a slab of dispersive and dissipative material with negative dielectric permittivity ($\epsilon$) and magnetic permeability ($\mu$) have been calculated by using the average flow of electromagnetic energy in the medium. The effects of bandwidth of the pulse and dissipation in the medium have been investigated. While both large bandwidth and large dissipation have similar effects in smoothening out the resonant features that appear due to Fabry-P\'{e}rot resonances, large dissipation can result in very small or even negative traversal times near the resonant frequencies. We have also investigated the traversal times and Wigner delay times for obliquely incident pulses and evanescent pulses. The coupling to slab plasmon polariton modes in frequency ranges with negative $\epsilon$ or $\mu$ is shown to result in large traversal times at the resonant conditions. We also find that the group velocity mainly contributes to the delay times for pulse propagating across a slab with n=-1. We have checked that the traversal times are positive and subluminal for pulses with sufficiently large bandwidths.Comment: 9 pages, 9 figures, Submitted to Phys. Rev.

Performans Itik Pedaging (Lokal X Peking) Fase Starter Pada Tingkat Kepadatan Kandang Yang Berbeda Di Desa Laboi Jaya Kabupaten Kampar

Cage is one of the supported factors in a farm. It will give effect to pleasance catle because crowded cage will influent temperature and atmosphere moisture in the cage. Finally it will give effect for growing duck. Sample which is used iIi research is 66 meaty duck (local x peking) for fase starter. Food which is used is standard food BUS 602-C:rumble. Itis produced by PT Berlian Unggas Sakti. This research used 4 characters, the characters· which are observed is crowded cage degree namely A ( 4 duck/O.5 m2), B ( 5 duck/O.5 m2), C (6 duck/O.5 m2), and D ( 7 duck/O.5 m2). The result of this research can be sununarized that crowded cage degree A and C, A and D give significant (PO.05) to convert food.. From the result of research. we get information that crowded cage b (5 duck/O.5 m2) gives the best effect for performance of meaty duck. Itis indicated by high adding weight of physic and convertion oflower food

Design & Development of a Two-jaw parallel Pneumatic Gripper for Robotic Manipulation

The handling of abstract materials and mechanisms to pick and place are widely found in factory automation and industrial manufacturing. There are different mechanical grippers which are based on different motor technologies have been designed and employed in numerous applications. The designed robotic gripper in this paper is a two jaw actuated gripper which is different from the conventional cam and follower gripper in the way that controlled movement of the jaws is done with the help of pneumatic cylinders using air pressure. The force developed in the cylinder is very gentle and is directly delivered to the jaws in a compact way. The design, analysis and fabrication of the gripper model are explained in details along with the detailed list of all existing pneumatic grippers in market. The force and torque for the gripper have been calculated for different set of conditions. The working of the model is checked for and observation for pay load is recorded at various pressures. The highly dynamic and highly accelerated gripper model can be easily set at intermediate positions by regulating the pressure. Pneumatic grippers are very easy to handle and are generally cost-effective because air hoses, valves and other pneumatic devices are easy to maintain