Nemo Semret

Nemo Semret
QRB Labs

About

28
Publications
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940
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Publications

Publications (28)
Preprint
Full-text available
What happens to mining when the Bitcoin price changes, when there are mining supply shocks, the price of energy changes, or hardware technology evolves? We give precise answers based on the technical forces and incentives in the system. We then build on these dynamics to consider value: what is the cost and purpose of mining, and is it worth it? Do...
Preprint
Full-text available
We present a fully automated model for in-season crop yield prediction, designed to work where there is a dearth of sub-national "ground truth" information. Our approach relies primarily on satellite data and is characterized by careful feature engineering combined with a simple regression model. As such, it can work almost anywhere in the world. A...
Preprint
Full-text available
Consider the following game: You are given two indistinguishable envelopes, each containing money. One contains twice as much as the other. You may pick one envelope and keep the money it contains. Having chosen an envelope, you are given the chance to switch envelopes. Should you switch? The intuitive and correct answer is that it makes no differe...
Preprint
Full-text available
This paper discusses the application of a US corn yield model [1] in a broader setting: different crops and different regions. With the framework built in [1], we test the methodology that we applied to corn in the US to winter wheat in India. As was the case with our model for soybeans in Argentina [2], due to the lack of existing wheat crop masks...
Article
Full-text available
This paper discusses the application of [1] in broader settings: different crops and different regions. With the framework built in [1], we test the same methodology that we applied to corn in the US to soybeans in Argentina. The best performing model we find takes NDVI, land surface temperature, and soil moisture as inputs, and can predict yield f...
Article
Full-text available
Accurately forecasting crop yields has broad implications for economic trading, food production monitoring, and global food security. However, the variety of environmental variables across time and space presents challenges and has limited the precision of yield models. Here, we develop a machine-learning based model forecasting end-ofseason, or fi...
Article
Full-text available
This paper presents a decentralized auction-based approach to pricing of edge-allocated bandwidth in a differentiated services Internet. The players in our network economy model are one raw-capacity seller per network, one broker per service per network, and users, to play the roles of whole-sellers, retailers, and end-buyers, respectively, in a tw...
Conference Paper
Full-text available
A key consideration in building differentiated network services is the feasibility of maintaining stable and consistent service level agreements across multiple networks where allocations are made only on the edges. To investigate this, we consider a game theoretic model of capacity provisioning in a differentiated services Internet. The players ar...
Article
Full-text available
We present the Progressive Second Price auction, a new decentralized mechanism for allocation of variable-size shares of a resource among multiple users. Unlike most mechanisms in the economics litterature, PSP is designed with a very small message space, making it suitable for real-time market pricing of communication bandwidth. Under elastic dema...
Article
Full-text available
Market Mechanisms for Network Resource Sharing The theme of this thesis is the design and analysis of decentralized and distributed market mechanisms for resource sharing in multiservice networks. The motivation for a market-based approach is twofold. First, in modern multiservice networks, resources such as bandwidth and buffer space have differen...
Article
Guided by the empirical observation that realtime MPEG video streams exhibit both multiple time scale and subexponential characteristics, we construct a video model that captures both of these characteristics and is amenable to queueing analysis. We investigate two fundamental approaches for extracting the model parameters: using sample path and se...
Article
Full-text available
this paper, we show that the equilibrium holds when PSP is applied by independent resource sellers on each link of a network with arbitrary topology, with users having arbitrary but #xed routes. In this network 2 case, the distributed mechanism has a further incentive compatibility in that submitting the same bid at all links along the route is an...
Conference Paper
Full-text available
This paper presents a decentralized auction-based approach to pricing of edge-allocated bandwidth in a differentiated services model for the Internet. The players in this architecture are users, one raw-capacity seller per network and one broker per service per network. With the progressive second price auction mechanism as the basic building block...
Article
Full-text available
We propose a new approach to pricing of capacity in service systems with blocking, using spot and derivative market mechanisms. A second-price auction among arrivals grouped in batches gives rise to the spot market of usage charges. A reservation guaranteeing access for an arbitrary duration with a usage price below the bid can be made at any time...
Article
Full-text available
We present the Progressive Second Price auction, a new decentralized mechanism for allocation of variable-size shares of a resource among multiple users. Unlike most mechanisms in the economics litterature, PSP is designed with a very small message space, making it suitable for real-time market pricing of communication bandwidth. Under elastic dema...
Article
Full-text available
Guided by the empirical observation that real-time MPEG video streams exhibit both multiple time scale and subexponential characteristics, we construct a video model that captures both of these characteristics and is amenable to queueing analysis. We investigate two fundamental approaches for extracting the model parameters: using sample path and s...
Article
Full-text available
We consider the use of an auction as a decentralized mechanism for efficiently and fairly sharing resources in a network. We present a new auction rule called Progressive Second Price, and prove that it has a "truthful" Nash equilibrium. We give necessary conditions for the resulting allocations to be fair (envy-free), and demonstrate that, with a...
Technical Report
Full-text available
This paper is a review of Anderlini and Sabourian's working paper entitled The Evolution of Algorithmic Learning Rules: A Global Stability Result[AS95].
Article
Full-text available
We present a game theoretic approach to a resource allocation problem motivated by a concept of Open Spectrum Access. After setting up requirements of fairness and efficiency, we design an auction mechanism whose outcome (the Nash equilibrium) satisifies the specifications, under certain straightforward assumptions on players' characteristics. The...
Conference Paper
Full-text available
Regulatory reform is the most crucial challenge facing us at the dawn of the information age in Africa. This paper will make the case for deregulation and private enterprise as a must for cybercommunications to develop in Ethiopia. While the case can be made from a wide range of perspectives (socio-economic, historical, etc.), the approach here s b...
Article
This paper deals mainly with the preliminary stages of the analytical side of this on-going project, considers some fundamental questions, and maps out the promising directions for the development of the analysis. Section 2 presents our game theoretic approach, including a statement of our objectives, a precise formulation of the problem, a charact...
Article
Full-text available
We develop a practical, multiple time scale model for MPEG video traffic whose accuracy and relatively low computational complexity make it well suited for real-time traffic generation experiments on broadband networks. The major feature of our approach is the decomposition of the frame size sequence into simple slow and fast time scale components....
Article
Introduction & Objectives Our objective is the study of the architecture, management and control of high speed multimedia networks. In the present work, the focus is in particular on the use of Java[JAVA], a network oriented interpreted language, for research and practical applications in those areas. We developped a distributed game called TREX (T...
Article
Full-text available
Introduction & Objectives Our objective is the study of the architecture, management and control of high speed multimedia networks. In the present work, the focus is in particular on the use of Java[JAVA], a network oriented interpreted language, for research and practical applications in those areas. We developped a distributed game called TREX (T...
Article
Full-text available
This project concerns itself with the theory of secret sharing. In this report, after giving a brief overview of the concepts and some basic facts, we consider a fundamental question, namely, can any access structure be realized in a secret sharing scheme? In answer to that, we present two well known schemes that realize all monotone access structu...
Article
Full-text available
Contents 1 Introduction 2 2 Analysis 2 3 Simulation Program 4 3.1 Outline of the Design : : : : : : : : : : : : : : : : : : : : : : : : : 4 3.2 Sample Run : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 8 4 Results 9 4.1 Exponentially distributed packet lengths : : : : : : : : : : : : : : 9 4.2 Constant packet lengths : : : : : : : : :...
Article
We analyze the statistical properties of MPEG video traffic based on a collection of data from real video applications. Based on that analysis, we develop a model whose accuracy and relatively low computational complexity make it well suited for real-time traffic generation experiments on broadband testbed networks. The major feature of our approac...

Projects

Projects (3)