![]() You can disable notifications at any time in your settings menu. There's a small grey rectangular button on one side, and near the top you'll find a glowing white LED and a pair of charging contacts. Looking close up at the pen, you notice several things that clue you to the fact that this is not just a plastic pen. The point where your fingers hold the pen is made of a translucent white plastic that tapers down to the pressure sensitive tip, while the rest of the body is made of a white plastic. It's triangular in shape, wider than your usual "stick ballpoint pen", and has a good feel to it. ![]() The Equil Smartpen 2 reminds me of some pens that I've received as handout promotional items. Well, the Equil Smartpen 2 (US$169, pre-order on Indiegogo) wants to change all that by giving you a comfortable ballpoint pen that captures all of your writing and sketching on plain paper, moving it to either a Mac app (Equil Note, free) or one of several free iOS apps ( Equil Note HD for iPad, Equil Note for iPhone, Equil Sketch HD for iPad, and Equil Sketch for iPhone. The problem comes when you want to get some of that information into a computer, at which time you usually have to transcribe your handwritten notes and then try to recreate your drawings or scan them. You can draw, annotate, write, and organize your information in a real notebook. Krawczyk, R.: Newton-Algorithmen zur Bestimmung von Nullstellen mit Fehlerschranken.For a lot of people, there's no substitute for taking notes with a pen and piece of paper. Wiley-Interscience, Chichester (1998)īroyden, C.G.: A class of methods for solving nonlinear simultaneous equations. Wiley Series in Probability and Statistics. Gross, D., Harris, C.M.: Fundamentals of Queueing Theory, 3rd edn. Cambridge University Press, Cambridge (1990) Mermaier, A.: Interval Methods for Systems of Equations. Ross, S.M.: Introduction to Probability Models, 7th edn. In: IEEE INFOCOM’06, IEEE Computer Society Press, Los Alamitos (2006) Medepalli, K., Tobagi, F.A.: Towards performance modeling of ieee 802.11 based wireless networks: A unified framework and its applications. In: ACM SIGMETRICS’04, ACM Press, New York (2004) Kim, H., Hou, J.C.: A fast simulation framework for ieee 802.11-operated wireless lans. In: ACM SIGMETRICS’05, ACM Press, New York (2005) Ramaiyan, V., Kumar, A., Altman, E.: Fixed pointed analysis of single cell ieee 802.11e wlans: Uniqueness, multistability and throughput differentiation. In: IEEE INFOCOM’05, IEEE Computer Society Press, Los Alamitos (2005) Kumar, A., et al.: New insights from a fixed point analysis of single cell ieee 802.11 wlans. In: IEEE ICNP’03, IEEE Computer Society Press, Los Alamitos (2003) LNCS, vol. 3462, Springer, Heidelberg (2005)Ĭarvalho, M., Garcia-Luna-Aceves, J.J.: Delay analysis of ieee 802.11 in single-hop networks. Garetto, M., Chiasserini, C.-F.: Performance analysis of 802.11 wlans under sporadic traffic. IEEE Journal on selected areas in communication 18(3), 535–547 (2000)Įrge, M., Varaiya, P.: Throughput analysis and admission control for ieee 802.11a. IEEE 802.11e Draft 3.1 (2002)īianchi, G.: Performance analysis of the ieee 802.11 distributed coordination function. IEEE 802.11 standard (1999)Ĩ02.11 Work Group: Draft Supplement to Standard for Telecommunications and Information Exchange between Systems-LAN/MAN Specific Requirements- Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Medium Access Control (MAC) Enhancements for Quality of Serice (QoS). IEEE: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Spec. This process is experimental and the keywords may be updated as the learning algorithm improves. These keywords were added by machine and not by the authors. ![]() ![]() We validate our model through simulations and the simulation results show that the model is quite accurate. More importantly, based on our model, we use interval analysis to formally study the existence and uniqueness of the network’s equilibrium, and find the sufficient condition for the uniqueness of equilibrium. We then derive the average per-flow service time of each flow, and apply it to calculate throughput. We first formalize the performance of 802.11 based MAC protocols with simultaneous fixed point equations. Our model can be used in general 802.11-based WLANs since it captures the important factors such as non-uniform backoff behavior, channel errors and unsaturated traffic. This paper presents a general model to study the medium access control (MAC) layer performance and equilibrium of WLANs consisting of nodes with different MAC parameters (e.g., backoff window size). ![]()
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