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A new method for assessment of engineering drawing answer scripts using fuzzy logic
, Article Journal of Computational Applied Mechanics ; Volume 51, Issue 1 , June , 2020 , Pages 170-183 ; Jahantigh Pak, A ; Sharif University of Technology
University of Tehran
2020
Abstract
Popular method for assessment of final exam answer scripts in university and among the engineering drawing answer scripts based on absolute true or false judgment and assigning a single number or letter to answer of each problem cannot be so fair. To obtain a fair assessment method, we considered “imagination”, “accuracy”, “drawing” and “innovation” that are objectives of engineering drawing course to be separately assessed for each problem. Flexibility and linguistic properties of fuzzy logic made us use it as the basis of our method. In addition, fuzzy variables and membership functions are easily linguistic explainable, and adjustable to different conditions. “Answering time” was added as...
Fair allocation of indivisible goods: Beyond additive valuations
, Article Artificial Intelligence ; Volume 303 , 2022 ; 00043702 (ISSN) ; HajiAghayi, M ; Seddighin, M ; Seddighin, S ; Yami, H ; Sharif University of Technology
Elsevier B.V
2022
Abstract
We conduct a study on the problem of fair allocation of indivisible goods when maximin share [1] is used as the measure of fairness. Most of the current studies on this notion are limited to the case that the valuations are additive. In this paper, we go beyond additive valuations and consider the cases that the valuations are submodular, fractionally subadditive, and subadditive. We give constant approximation guarantees for agents with submodular and XOS valuations, and a logarithmic bound for the case of agents with subadditive valuations. Furthermore, we complement our results by providing close upper bounds for each class of valuation functions. Finally, we present algorithms to find...
Expand the shares together: envy-free mechanisms with a small number of cuts
, Article Algorithmica ; 2018 ; 01784617 (ISSN) ; Farhadi, M ; Ghodsi, M ; Alijani, R ; Tajik, A. S ; Sharif University of Technology
Springer New York LLC
2018
Abstract
We study the problem of fair division of a heterogeneous resource among strategic players. Given a divisible heterogeneous cake, we wish to divide the cake among n players to meet these conditions: (I) every player (weakly) prefers his allocated cake to any other player’s share (such notion is known as envy-freeness), (II) the allocation is dominant strategy-proof (truthful) (III) the number of cuts made on the cake is small. We provide methods for dividing the cake under different assumptions on the valuation functions of the players. First, we suppose that the valuation function of every player is a single interval with a special property, namely ordering property. For this case, we...
Weighted start-time fair queuing: A new start-time fair queuing for elastic traffic
, Article 2009 Spring Simulation Multiconference, SpringSim 2009, 22 March 2009 through 27 March 2009 ; 2009 ; Movaghar, A ; Sharif University of Technology
Association for Computing Machinery, Inc
2009
Abstract
In this paper, we present a new Start-time Fair Queuing (SFQ) algorithm called Weighted Start-time Fair Queuing (WSFQ) which is more efficient and achieves better fairness than SFQ in the presence of small and huge elastic traffic flows. WSFQ scheduler, like SFQ uses a start time eligibility criterion to select packets and when the start-time of two packets in two flows are the same, it acts like Weighted Fair Queuing (WFQ) which selects the smallest virtual finish time first. Afterward, we compared the performance of our model with that of the applied scheduling algorithms such as First-In-First-Out (FIFO), SFQ as well as WFQ on the end-to-end delay and the throughput in small and...
Information theoretic cutting of a cake
, Article IEEE Transactions on Information Theory ; Volume 63, Issue 11 , 2017 , Pages 6950-6978 ; 00189448 (ISSN) ; Gohari, A ; Sharif University of Technology
Abstract
Cutting a cake is a metaphor for the problem of dividing a resource (cake) among several agents. The problem becomes non-trivial when the agents have different valuations for different parts of the cake (i.e., one agent may like chocolate, while the other may like cream). A fair division of the cake is one that takes into account the individual valuations of agents and partitions of the cake based on some fairness criterion. Fair division may be accomplished in a distributed or centralized way. Due to its natural and practical appeal, it has been a subject of study in economics. To the best of our knowledge, the role of partial information in fair division has not been studied so far from an...
A solution on deafness problem of WiGig networks based on IEEE 802.11ad
, Article 2017 Wireless Days, WD 2017, 29 March 2017 through 31 March 2017 ; 2017 , Pages 1-3 ; 9781509058563 (ISBN) ; Manzuri Shalmani, M. T ; Ajorloo, H ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2017
Abstract
In this short paper, we study the deafness problem raised in the directional multi Gigabit transmission of IEEE 802.11ad standard which causes the devices to experience unequal chance of accessing the medium. We define three groups of Quasi-Omni (QO) antennas and propose two simple approaches to mitigate the deafness problem. Our simulation results show that the fairness increases up to 99% compared with current definition of IEEE 802.11ad which is less than 40%. © 2017 IEEE
Design of a Traceable Optimistic Fair Exchange Protocol
, M.Sc. Thesis Sharif University of Technology ; Salmasizadeh, Mahmoud (Supervisor)
Abstract
Fair exchange of digital items through computer network is an important research topic of modern cryptography. Generallty, a fair exchange protocol is a way which helps two parties to exchange their digital items fairly, so that at the end of the protocol execution, both parties recieve their desirable items or none of them recieves anything. In a practical applications, fair exchange protocol is widely used in different but related fields like contract signing protocols,non-repudiation protocols,e-ayment system and certified e-mails. In a fair exchange protocol, a trusted third party (TTP) acts as an arbitrator between two parties. To reduce the traffic load of the arbitrator, the concept...
An adaptive contention window control for improving DCF throughput and fairness
, Article European Journal of Scientific Research ; Volume 45, Issue 2 , 2010 , Pages 310-323 ; 1450216X (ISSN) ; Ghasemivand, M ; Movaghar, A ; Jabbehdari, S ; Sharif University of Technology
Abstract
The IEEE 802.11 provides a MAC layer protocol for controlling competition among nodes to access the channel in wireless local area network. Recent works show that this standard has not suitable performances in mobile ad-hoc networks and especially in error prone channels. Many researchers proposed many algorithms to improve this standard like HBCWC (History Based Contention Window Control) scheme has significant performances but also has fairness problem. In this paper, we present a novel contentionbased protocol to improve fairness and throughput together. We use an array to keep history of network collision and based on array information, we optimize the contention window. The main point...
Envy-free mechanisms with minimum number of cuts
, Article 31st AAAI Conference on Artificial Intelligence, AAAI 2017, 4 February 2017 through 10 February 2017 ; 2017 , Pages 312-318 ; Farhadi, M ; Ghodsi, M ; Seddighin, M ; Tajik, A. S ; Amazon; Artificial Intelligence; Baidu; et al.; IBM; Tencent ; Sharif University of Technology
AAAI press
2017
Abstract
We study the problem of fair division of a heterogeneous resource among strategic players. Given a divisible heterogeneous cake, we wish to divide the cake among n players in a way that meets the following criteria: (I) every player (weakly) prefers his allocated cake to any other player's share (such notion is known as envy-freeness), (II) the mechanism is strategy-proof (truthful), and (III) the number of cuts made on the cake is minimal. We provide methods, namely expansion process and expansion process with unlocking, for dividing the cake under different assumptions on the valuation functions of the players. Copyright © 2017, Association for the Advancement of Artificial Intelligence...
Expand the shares together: envy-free mechanisms with a small number of cuts
, Article Algorithmica ; Volume 81, Issue 4 , 2019 , Pages 1728-1755 ; 01784617 (ISSN) ; Farhadi, M ; Ghodsi, M ; Alijani, R ; Tajik, A. S ; Sharif University of Technology
Springer New York LLC
2019
Abstract
We study the problem of fair division of a heterogeneous resource among strategic players. Given a divisible heterogeneous cake, we wish to divide the cake among n players to meet these conditions: (I) every player (weakly) prefers his allocated cake to any other player’s share (such notion is known as envy-freeness), (II) the allocation is dominant strategy-proof (truthful) (III) the number of cuts made on the cake is small. We provide methods for dividing the cake under different assumptions on the valuation functions of the players. First, we suppose that the valuation function of every player is a single interval with a special property, namely ordering property. For this case, we...
Impact of leadership styles on employees’ performance with moderating role of positive psychological capital
, Article Total Quality Management and Business Excellence ; Volume 32, Issue 9-10 , 2021 , Pages 1085-1105 ; 14783363 (ISSN) ; Iqbal, S ; Abrar, M ; Ahmad Baig, I ; Amjad, F ; Zia-ur-Rehman, M ; Awan, M. U ; Sharif University of Technology
Routledge
2021
Abstract
The study aimed to investigate the most effective leadership style that enhances the employees’ performance at the workplace and also evaluate the impact of leadership styles (Laissez-faire leadership, Transformational leadership, Transactional leadership,) on employees’ performance in the textile sector of Pakistan. The study explored the moderating role of Positive psychological capital to examine the relationship between leadership styles and employee performance. A quantitative research technique was used, and Data were collected from the lower to middle-level manager of the textile sector. The findings of this study showed that laissez-faire leadership has a significant but negative...
On the relevance of fair sampling assumption in the recent bell photonic experiments
, Article Journal of Modern Optics ; Volume 52, Issue 10 , 2005 , Pages 1405-1414 ; 09500340 (ISSN) ; Golshani, M ; Sharif University of Technology
2005
Abstract
In the experimental verification of Bell's inequalities in real photonic experiments, it is generally believed that the so-called fair sampling assumption (which means that a small fraction of results provide a fair statistical sample) has an unavoidable role. Here, we want to show that the interpretation of these experiments could be feasible, if some different alternative assumptions other than the fair sampling were used. For this purpose, we derive an efficient Bell-type inequality which is a CHSH-type inequality in real experiments. Quantum mechanics violates our proposed inequality, independent of the detection-efficiency problems. © 2005 Taylor & Francis Group Ltd
Perceptions of instructor injustice in COVID-19-imposed online courses: EFL students’ perceptions and experiences in focus
, Article Communication Quarterly ; Volume 70, Issue 5 , 2022 , Pages 469-494 ; 01463373 (ISSN) ; Zhaleh, K ; Estaji, M ; Sharif University of Technology
Routledge
2022
Abstract
The present study explored Iranian students’ perceptions of unfair instructor behavior in COVID-19 crisis-prompted online language education. Through an online open-ended questionnaire, 91 Iranian English as a Foreign Language (EFL) university students reported their beliefs and experiences concerning instructor injustice in online classes. Results indicated that about two-thirds of the students considered the nature of online courses, particularly their impact on student-instructor relational communication and favoritism, to be a factor leading to teacher unjust behavior. They also identified technological factors, including students’ online communication anxiety, as barriers. Consistent...
A traceable optimistic fair exchange protocol
, Article 2014 11th International ISC Conference on Information Security and Cryptology, ISCISC 2014 ; 2014 , pp. 161-166 ; ISBN: 9781479953837 ; Asaar, M. R ; Salmasizadeh, M ; Sharif University of Technology
Abstract
An Optimistic fair exchange (OFE) protocol is a good way for two parties to exchange their digital items in a fair way such that at the end of the protocol, both of them receive their items or none of them receives anything. In 2008, Huang et al. presented an efficient OFE protocol, but there is a security problem in their scheme. If the trusted third party (TTP) is dishonest and colludes with the verifier, the TTP can complete the transaction without getting signer's agreement. To solve this problem, we propose an OFE protocol in which there is a tracing algorithm to detect the party who completes the transaction. Furthermore, we obtain the accountability property introduced by Huang et al....
Importance of factors effective upon consumers' perception of fairness in dynamic pricing: An fcm approach SUBMITTED to: ICAI
, Article Proceedings of the 2011 International Conference on Artificial Intelligence, ICAI 2011 ; Volume 2 , 2011 , Pages 698-705 ; 9781601321855 (ISBN) ; Lotfi, N ; Namin, A. T ; Najmi, M ; Univ. California, Berkeley, BISC; HST Harvard Univ. MIT, Biomed. Cybern. Lab.; Univ. Texas Austin, Intelligent Data Explor. Anal. Lab.; Univ. South. California, CACS; University of Minnesota, Minnesota Supercomputing Institute ; Sharif University of Technology
Abstract
This article build upon fairness in pricing -i.e. a perceived fairness judgment by a buyer of a seller's prices (Haws and Bearden, 2006) - and dynamic pricing - a strategy in which prices vary over time, consumers, and/or circumstances (Haws and Bearden, 2006) - an analysis of the importance of the factors influencing consumers' perception of fairness. Specifically, it uses fuzzy cognitive maps on the model proposed by Haws and Bearden (2006) to find the most important path leading to consumer satisfaction with the price. The FCM analyzes the responses of a group of 30 experts from 4 leading companies in medical equipment importing to find the most important paths
On the fairness of airlines' ticket pricing as a result of revenue management techniques
, Article Journal of Air Transport Management ; Vol. 40, issue , August , 2014 , pp. 56-64 ; 09696997 ; Modarres, M ; Sibdari, S ; Sharif University of Technology
Abstract
Pricing and availability of tickets have always been a source of confusion for customers in transportation industries. What is the best time to buy tickets? Why passengers taking the same flight might pay significantly different prices for the same seat? Why round trip tickets between two cities sometimes become cheaper than the one-way flights between them? Is it fair to buy a ticket for an itinerary cheaper than a ticket for just a part of it? These observations make customers wonder why they pay higher prices for shorter flights. In this paper, we study the airlines' revenue management systems and explain some of these pricing schemes in travel industries. We develop a simulator to study...
Quality of service provisioning in optical CDMA packet networks
, Article Journal of Optical Communications and Networking ; Volume 2, Issue 5, Article number 5457930 , May , 2010 , Pages 283-292 ; Pakravan, M. R. (Mohammad Reza) ; Sharif University of Technology
Abstract
An enhanced media access control (MAC) layer protocol that uses the signaling method benefits of the physical layer in order to provide different levels of quality to different users in optical code-division multiple-access (OCDMA) packet networks is presented. In the proposed network architecture the users are categorized into two classes of service, one having a higher quality level and the other having a lower quality level. Users of each class transmit at the same power level and different from the other classes’ users. Also, the MAC of each user estimates the amount of interference on the channel and adjusts the packet transmission’s time to improve network performance. Through...
Fair allocation of indivisible goods: improvements and generalizations
, Article ACM EC 2018 - Proceedings of the 2018 ACM Conference on Economics and Computation11 June 2018 ; 11 June , 2018 , Pages 539-556 ; 9781450358293 (ISBN) ; Hajiaghayi, M ; Seddighin, M ; Seddighin, S ; Yami, H ; Sharif University of Technology
Association for Computing Machinery, Inc
2018
Abstract
We study the problem of fair allocation for indivisible goods. We use the maxmin share paradigm introduced by Budish [16] as a measure for fairness. Kurokawa, Procaccia, and Wang [36] were the first to investigate this fundamental problem in the additive setting. They show that a maxmin guarantee (1-MMS allocation) is not always possible even when the number of agents is limited to 3. While the existence of an approximation solution (e.g. a 1/2-MMS allocation) is quite straightforward, improving the guarantee becomes subtler for larger constants. Kurokawa et al. [36] provide a proof for the existence of a 2/3-MMS allocation and leave the question open for better guarantees. Our main...
Fair allocation of indivisible goods: Improvement
, Article Mathematics of Operations Research ; Volume 46, Issue 3 , 2021 , Pages 1038-1053 ; 0364765X (ISSN) ; Hajiaghayi, M. T ; Seddighin, M ; Seddighin, S ; Yami, H ; Sharif University of Technology
INFORMS Inst.for Operations Res.and the Management Sciences
2021
Abstract
We study the problem of fair allocation for indivisible goods. We use the maximin share paradigm introduced by Budish [Budish E (2011) The combinatorial assignment problem: Approximate competitive equilibrium from equal incomes. J. Political Econom. 119(6):1061-1103.] as a measure of fairness. Kurokawa et al. [Kurokawa D, Procaccia AD, Wang J (2018) Fair enough: Guaranteeing approximate maximin shares. J. ACM 65(2):8.] were the first to investigate this fundamental problem in the additive setting. They showed that in delicately constructed examples, not everyone can obtain a utility of at least her maximin value. They mitigated this impossibility result with a beautiful observation: no...
Stale Pricing in Mutual Funds
, M.Sc. Thesis Sharif University of Technology ; Barakchian, Mahdi (Supervisor) ; Ebrahimnejad, Ali (Supervisor)
Abstract
One of the advantage of the mutual funds is their liquidity. They should pay back investor’s money based on Net Asset Value (NAV) anytime they request. Sometimes, NAV computed by fund is different from the real value of it. This error in pricing could be more intense in Iran because Iran stock market liquidity is low, ticker become closed frequently, and stocks can’t be traded and the change of price in one day has the limitation. All of these reasons make the price of stock in Iran stale which doesn’t contain the latest market information. The staleness of stock price makes the return of funds predictable and provide the opportunity of arbitrage which causes the transfer of the wealth among...