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Factors of Bluetooth Technology to Mitigate Interference with Wi-Fi

Bluetooth wireless technology (BT) operates in the unlicensed Industrial, Scientific, Medical (ISM) band in the 2.4GHz frequency range. It randomly uses 79 1Mhz wide channels ranging from 2.402MHz to 2.480MHz. Each channel is occupied for a maximum time slot of 625us. During this time the radio must change the operating frequency, receive or transmit data, and provide enough off time before switching to the next hop frequency. In reality, the time the radio is actually transmitting on a given channel is much less and is dependent on the amount of data being transmitted. WIFI WiFi or 802.11 b/g, also operates in the same ISM band as BT. Due to complicated modulation techniques, 802.11g channels are 20MHz wide while 802.11b channels are 22MHz wide. This means a common WiFi channel can occupy from 20 to 22 BT channels. COURTESY: HTTP://EN.WIKIPEDIA.ORG/ WIKI/IEEE_802.11B-1999 INTERFERENCE For an RF signal to be received by the radios receiver, the RF signal must contain enough energy to be detected by the receiver circuit. The minimum receive level is known as the receivers sensitivity. This is similar to the lowest whisper that a human ear can detect. What if there happens to be two signals present at the same time and both are greater than the receiver’s sensitivity? Which signal will the radio detect? One would think that it would not be able to correctly detect either signal. That would be true if both signals are close to the same power level. If one signal had a higher power level than the other signal by a specific amount, the radio would be able to detect the more powerful signal. This is similar to a human ear being able to clearly understand members at a dinner table while there are many others talking at tables that are further away. The minimum ratio of power level for two signals when a radio can correctly detect the desired signal is known as the carrier/interferer ratio, or C/I. This means that two RF signals can exist on the same frequency at the same time without causing interference if the ratio of their power levels meet the radios C/I specification.

Science Olympiad Robots
by olin4 0 Comments favorite 9 Viewed Download 0 Times

Okay, so what is a robot? Per definition of en.wikipedia.org, the Holder of All Human Knowledge, a robot is: a mechanical device that can perform physical tasks. A robot may act under the direct control of a human (eg. the robotic arm of the space shuttle) or autonomously under the control of a pre-programmed computer. In the context of Science Olympiad and other small engineering competitions, we are looking at the first type, human control. There are plenty of opportunities to put autonomous features into a Science Olympiad robot, but if you are reading this for content, it is likely beyond your scope and unnecessary. Therefore, for the purposes of this text only, a robot will be defined as: A mechanical device, operated under the direct control of a human, that is engineered to perform a specific task or accomplish a goal. In this case, the goal is to compete in Science Olympiad's Robot Ramble event. And win. More on that later. I'm not smart enough to build a robot! Yes you are. Modern technology has developed to the point at which it permeates our lives. One side effect of this is that it is much easier to learn and try out than in years past. The hobby robotics market is only increasing, and there are a number of companies that specifically make products catered to robots and their builders. Full directions and kits are available to build or program small robots. In some cases, they're even premade, and all you have to do is mess with them. This is often the best way to go about learning.

Very old Ricoh camera and lenses to work with newer DSLR ... - Rqna

Asked by SixfootJames on 2012-10-24T11:49:33-04:00 I've been given an old bag of Ricoh camera and lenses and I find that it would be such a waste not to be able to use in some way all this again for something. Can you give me some suggestions as to how to use this kind of equipment with a newer camera like a Canon 600D? Archives Arts Questions and Answers Photography Questions and Answers Oct 24th, 2012 Archives Week 43, 2012 Archives October, 2012 Archives Tags Lens Dslr Old Lenses Best Answer Answered by John Cavan on 2012-10-24T23:11:20-04:00 Ricoh, historically, used the Pentax K-mount for their film SLR cameras, but with a slight and important modification: they added a pin that's used to indicate the aperture is in auto mode for shutter priority use. With some careful work, you can http://forums.dpreview.com/forums/post/25959708 for use on K-mount bodies made by Pentax or Samsung or with a http://rads.stackoverflow.com/amzn/click/B003Y3EJMU for Canon EOS digital and film variants. Nevertheless, if you have Ricoh K-mount lenses, that pin has to go. You can confirm if you have these based on this helpful bit of info from Wikipedia: The R-K mount is used on Rikenon P lenses, Ricoh bodies that include the letter 'P' in their model number, and some non-Ricoh lenses. Now, it's also possible that the Ricoh lenses are M42 screw-mount lenses also known, funny enough, as the Pentax mount when most film cameras had it and Pentax was the SLR king. If that is the case, and it's easy to tell by just looking for threads on the lens mount, then you can easily get...

Como escribir una excelente carta de presentación

¿Tienes un curriculum impresionante? ¿Sabes cómo presentarte muy bien en las entrevistas? ¿Sabes para qué clase de puesto estás hecho? Ahora todo lo que necesitas es una oportunidad para que “camines” hacia la puerta correcta. Sólo piensa, ¿qué podrías hacer para que esto suceda? Asegúrate de escribir una carta de presentación que tenga impacto. Es tu oportunidad de hacerle ver a tus empleadores por qué deberían considerarte para el puesto. Tu carta de presentación es una herramienta de ventas que debería estar dirigida al puesto específico que estás buscando. También es una oportunidad de mostrar a los potenciales empleadores tus habilidades de redacción. Si es el caso de que estás enviando una carta de presentación en otro idioma distinto de tu lengua nativa, es una excelente oportunidad de demostrar que puedes expresarte con fluidez. Sin importar cuál sea el nivel de tus habilidades en el idioma y tu capacidad de redacción, asegúrate de que tu carta no contenga errores. Reléela varias veces. Una carta de presentación, como la mayoría de la correspondencia de negocios, tiene tres partes...

The Horde 4 PHP framework
by hirax 0 Comments favorite 32 Viewed Download 0 Times

The Horde 4 PHP framework. Gunnar Wrobel wrobel@horde.org. May, 13th 2011 . Gunnar Wrobel (wrobel@horde.org). Horde 4. May, 13th 2011. 1 / 44 ... The Horde 4 PHP framework Gunnar Wrobel wrobel@horde.org May, 13th 2011 Gunnar Wrobel (wrobel@horde.org) Horde 4 May, 13th 2011 1 / 44 Components Components = Modules = Libraries = Packages = ... Photo: Rudolf Ammann [http://www.flickr.com/photos/rka/1415516/] Gunnar Wrobel (wrobel@horde.org) Horde 4 May, 13th 2011 2 / 44 The Horde 4 PHP framework There are more than 90 components available from http://pear.horde.org. Photo: Aaron Merrifield [http://www.flickr.com/photos/spammt/4823025103/] Gunnar Wrobel (wrobel@horde.org) Horde 4 May, 13th 2011 3 / 44 Groupware Photo: Denise Chan [http://www.flickr.com/photos/denn/5005046/] Gunnar Wrobel (wrobel@horde.org) Horde 4 May, 13th 2011 4 / 44 Groupware Definition “[...] groupware [...] is computer software designed to help people involved in a common task achieve their goals [...].”a a http://en.wikipedia.org/wiki/Groupware Remote It is usually associated with team members not physically co-located. Asynchronous Communication between team members is primarily asynchronous. Gunnar Wrobel (wrobel@horde.org) Horde 4 May, 13th 2011 5 / 44

Analyzing Design Tradeoffs in Large-scale Socio ... - Christoph Dorn

Emerging online collaboration platforms such as Wikipedia, Twitter, or Facebook provide the foundation for socio-technical systems where humans have become both content consumer and provider. Existing software engineering tools and techniques support the system engineer in designing and assessing the technical infrastructure. Little research, however, addresses the engineer’s need for understanding the overall socio-technical system behavior. The effect of fundamental design decisions becomes quickly unpredictable as multiple collaboration patterns become integrated into a single system. We propose the simulation of human and software elements at the collaboration level. We aim for detecting and evaluating undesirable system behavior such as users experiencing repeated update conflicts or software components becoming overloaded. To this end, this paper contributes (i) a language and (ii) methodology for specifying and simulating large-scale collaboration structures, (iii) example individual and aggregated pattern simulations, and (iv) evaluation of the overall approach. Keywords: Design Tools and Techniques, System Simulation, Collaboration Patterns, Large-scale Socio-Technical Systems

Aspire Serie 5715Z/5315 - ftp
by mongoo 0 Comments favorite 81 Viewed Download 0 Times

La información de esta publicación puede estar sujeta a cambios periódicos sin obligación alguna de notificar dichas revisiones o modificaciones. Dichas modificaciones se incorporarán a las nuevas ediciones de la presente guía o documentos y publicaciones complementarios. Esta empresa no hace promesas ni concede garantías, ya sean explícitas o implícitas, sobre el contenido del presente producto y declina expresamente toda garantía implícita de comerciabilidad o idoneidad para un fin determinado. Anote el número de modelo, el número de serie y la fecha y lugar de compra en el espacio provisto a continuación. Los números de serie y modelo figuran en la etiqueta pegada en el ordenador. Toda correspondencia relativa a su unidad deberá incluir los números de serie y modelo, así como la información de compra. Ninguna parte de esta publicación puede ser reproducida, almacenada en sistemas de recuperación o transmitida por ningún medio, ya sea electrónico, mecánico, fotográfico o de otro tipo, sin consentimiento por escrito de Acer Incorporated. Ordenador portátil Aspire 5715Z/5315 Número de modelo: _____________________ Número de serie: ________________________ Fecha de compra: ________________________ Lugar de compra: ________________________ Acer y el logotipo de Acer son marcas comerciales registradas de Acer Incorporated. Los demás nombres de productos o marcas comerciales sólo se utilizan con fines identificativos y pertenecen a sus respectivos propietarios. iii Información para su seguridad y comodidad Instrucciones de seguridad Lea atentamente estas instrucciones. Guarde este documento para consultarlo en el futuro. Siga los avisos e instrucciones marcados en el producto. Apagado del producto antes de limpiarlo Desconecte el producto de la toma de corriente antes de limpiarlo. No utilice productos de limpieza líquidos ni aerosoles. Utilice unpaño húmedo para la limpieza. PRECAUCIÓN con el enchufe como dispositivo desconectado Preste atención a las siguientes indicaciones cuando conecte o desconecte la energía a la unidad de suministro eléctrico: Instale la unidad de suministro eléctrico antes de conectar el cable de alimentación a la salida de corriente alterna, CA. Desenchufe el cable de alimentación antes de retirar la unidad de suministro eléctrico del ordenador. Si el sistema dispone de múltiples fuentes de alimentación, desconecte la energía del sistema desenchufando todos los cables de alimentación de los suministros de corriente. PRECAUCIÓN en Accesibilidad Asegúrese de que la salida de corriente a la que enchufa el cable de alimentación es fácilmente accesible y que se encuentra lo más próxima posible al operador del equipo. Cuando necesite desconectar la corriente del equipo, asegúrese de desenchufar el cable de alimentación de la salida de corriente. PRECAUCIÓN con la Tarjeta Ficticia PCMCIA y la Ranura Express Su ordenador se ha enviado con tarjetas plásticas ficticias instaladas en la PCMCIA y en la Ranura Express. Estas tarjetas protegen las ranuras no utilizadas frente a la entrada de polvo, objetos de metal y otras partículas. Guarde estas tarjetas para utilizarlas cuando no tenga PCMCIA o Tarjeta Express instalados en la ranura. ...

Tech City UK names Global Personals Ltd in Future Fifty fast-track

Tech City UK has named Global Personals Ltd in the second wave of 25 companies to join the Future Fifty programme, which matches high potential growth-stage businesses with bespoke public and private sector support. Visit: http://en.wikipedia.org/wiki/WhiteLabelDating

Global Personals / International Social Discovery

Global Personals provide social discovery and dating networks to countries on no less than four continents across the globe. Members of a Global Personals website can choose to focus their searches on people in their local area with a view to meeting personally once a relationship has been established. Visit: http://en.wikipedia.org/wiki/Global_Personals

Zend_Cache: how to improve the performance of ... - Enrico Zimuel

Zend_Cache: how to improve the performance of PHP applications by Enrico Zimuel (enrico.z@zend.com) Senior Consultant ­ Zend Technologies October 31th, PHP Barcelona Conference - 2009 Copyright © 2007, Zend Technologies Inc. About me Enrico Zimuel • I come from Turin (Italy). • Senior Consultant at Zend Technologies in Italy. • Software Engineer since 1996. • Open source contributor: XCheck, Core XPath • I was a Research Programmer at the Informatics Institute of the University of Amsterdam. • ZCE, ZFCE also proficiency in C/C++, Java, Perl, Javascript. • B.Sc. in Computer Science and Economics My website: http://www.zimuel.it ­ Blog: http://www.zimuel.it/blog Summary • Keys of performance of a PHP application • The caching mechanism • Zend Framework and Zend_Cache • Using the Zend_Cache to cache data and pages • Benchmarking different caching: Files, APC, Memcache, Zend Server CE Name of this section | | 3 Nov 2, 2009 Performance • How to improve the performance of a PHP application or more in general a piece of software?  Optimize the code (make the code faster)  Using a caching mechanism (reduce the amount of code to execute) Name of this section | | 4 Nov 2, 2009 What's a cache? • In computer science, a cache is a collection of data duplicating original values, stored elsewhere or computed earlier, where the original data is expensive to fetch (owing to longer access time) or to compute, compared to the cost of reading the cache From Wikipedia, the free encyclopedia Name of this section | | 5 Nov 2, 2009...

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