Sensys'12 (Day2)

Here are my much anticipated (at to the lowest degree past times Ted :-) notes from the minute solar daytime of Sensys.

Kyun queue: a sensor network scheme to monitor route traffic queues

I missed this talk, exactly this sounds similar an interesting paper. The thought seems to hold upwardly to deploy a transmitter in addition to a receiver node on the contrary sides of a road. Depending on the density in addition to the speed of the cars passing betwixt the transmitter in addition to the receiver, the received radio signal has dissimilar signatures. The go studies these signals in addition to figures out the route weather based on these.

Low toll crowdcounting using good tones

Crowd counting tin hold upwardly useful for resultant planning, learning popularity of aisles, etc. This go assumes that everyone inwards the crowd has a smartphone in addition to this counting app running on their phone. (This is the biggest limitation of the work.) This go uses the good tones (again ultrasound tones) emitted past times the phones to count the people. The app employs the smartphone mic in addition to speaker, no additional hardware is needed. The scheme uses an initiation tone to start. The telephone that hears this tone picks a frequency using uniform or amend geometric choosing method in addition to forwards the tone. The frequencies are picked inwards the ultrasound portion (that same 4khz band alluded to inwards yesterday's work.) Using uniform choosing method is non prone to collisions, the counts tin hold upwardly off due to the losses inwards collisions. The geometric choosing method employs geometric distributions in addition to thence is to a greater extent than prone to collisions. (My go on thresholding counting is rattling applicable for this problem: Singlehop Collaborative Feedback Primitives for Threshold Querying inwards Wireless Sensor Networks.) They did evaluations amongst 25+ phones, exactly inwards pretty controlled environments (phones at hand). The phones don't go good at pockets or behind clothing. The good tone method is said to hold upwardly low-power, exactly it is genuinely similar toll to the wifi. The authors didn't utilisation wifi because its make tin hold upwardly likewise long for the portion to hold upwardly counted. They said that, if ZigBee were available on the phones, they would utilisation it.

AudioDAQ: turning the mobile phone's ubiquitious headset port into a universal information acquisition interface

How refreshing! The presenter in addition to a atomic number 82 writer of this go is an undergraduate student. This go aims to create a platform (hardware in addition to software components) to collect analog sensor (any sensor) information through the good port of whatsoever phone. But the occupation is at that spot is almost no measure I/O connector, no measure programming interface, no 3rd political party app back upwardly on the smartphones. HiJack did a keen chore on the iPhone using the good headset port (the Energy-efficient GPS in addition to the MusicalHeart industrial plant at this Sensys used the HiJack approach). But HiJack is iPhone specific. This go extends to other phones using available might from "mic bias voltage" at the good headset port. Powered this way, the analog data/voltage from the sensor attached to the good port are encoded every bit the aAmplitude of a foursquare wave. This go uses the phone's builtin vocalism recording app (which is already optimized to hold upwardly low-energy in addition to utilisation hardware compression) to capture in addition to store the attached sensor information in addition to the phone's might to shipping the vocalism recording via email/mms for exporting the captured data. The software to procedure the signal in addition to translate it is at the cloud. The platform is evalued amongst an EKG application. Now y'all tin utilisation your smartphone every bit a holter device! The authors approximate that the hardware board for this platform would toll $5 inwards majority production.

Prius: generic hybrid line compression for WSNs

The destination of this go is to compress traces efficiently. Traces are of import for debugging WSN deployments, exactly line sizes tin go large, so they demand to hold upwardly compressed otherwise whether y'all write to flash (most oft the case) or exfiltrate to the basestation y'all are wasting a lot of precious energy. Traditional compression techniques (prediction-based, dictionary-based grammar-based) are non applicable for WSNs because they require to a greater extent than retentivity in addition to computation than is available inwards WSNs. The insights behind Prius go are that traces are highly repetitive, traces evolve slightly, in addition to computer program retentivity is non every bit scarce every bit data/var memory. The Prius approach is to mine line patterns offline (static-analysis of the computer program code?) in addition to to store them inwards computer program memory. In the offline learning phase, Prius creates a compression dictionary, this lexicon is so processed past times information construction generator to obtain an efficient information construction information construction to hold upwardly used inwards the headerfile of the deployed program.

DoubledipL leveraging thermoelectric harvesting for depression might monitoring of sporadic H2O use

This go does waterflow monitoring. The motes they built include acceleration in addition to temperature sensors in addition to utilisation wireless communication. The motes are harvesting their release energy on the pipes using the thermal gradients of the hot/cold H2O inwards the pipage in addition to the surroundings temperature.

Business meeting

There was a brusque occupation concern coming together inwards the afternoon. We learned that adjacent twelvemonth Sensys volition hold upwardly inwards Rome, Italy at the Sapienza University, November 11-15. The residue of the occupation concern coming together was spent for some soul-searching nigh Sensys. Is the excitement for Sensys diminishing every bit perchance indicated past times the Sensys submission in addition to attendance numbers are going down. With the smartphone going big, in addition to also getting a lot of focus at Sensys, how tin Sensys distinguish itself from Ubicomp or Ubisys? Andrew Campbell (Darthmouth) said he is nervous in addition to somewhat pessimistic nigh the hereafter of Sensys. He called on to the PhD students, Assistant professors, to acquire upwardly in addition to hold upwardly to a greater extent than engaged/central inwards Sensys community. Also several people voiced involvement for having a workshop on large information / machine learning every bit business office of Sensys.

Demo session

A lot of the papers inwards the conference got demoed inwards the demonstrate in addition to poster session. Probably at that spot were nigh 10 demos, in addition to xx to a greater extent than posters. The most interesting demonstrate must have got been the proximity social interaction monitoring sensors demonstrate from University of Utah. They had brought inwards 300 motes. Their large programming board, tin computer program upto 100 motes at the same time. They produced their ain hardware, in addition to said each mote toll nigh $30. They distributed upto 100 motes for monitoring, nigh one-half of the people inwards attendance got a mote from them. They also had stationary motes nether each poster table. Although the reception expanse was quite large, is L shaped, in addition to a lot of humans were inwards the vogue (all rattling detrimental to wireless communication), the stationary motes beak to singlehop to their basestation connected to the laptop. The mobile nodes had much smaller communication radius, they captured signals they heard from nearby motes, in addition to broadcasted these so that stationary motes tin alternative these upwardly in addition to forwards them to the basestation.

The musculus fatigue monitoring demonstrate was also rattling interesting. Yes, this was the guy amongst the yoga pants. I got to have got a closer await at the Cleon mote from the best newspaper (energy efficient GPS). I tried the MusicalHeart demo. I was told that music would non hold upwardly able to irksome my middle charge per unit of measurement at high activity score (jogging) every bit I suspected. I was told that I had to laid my tempo to the music, in addition to so my middle charge per unit of measurement volition slow. So the music entirely becomes the cue to speed upwardly or irksome downwards my activity. Sort of a bummer.

General comments

You could sympathise if a talk/paper is good received depending on the expose of people call for questions afterward the talk. The talks that have no questions hateful something was non quite right. (On related news, if I make non have whatsoever questions afterward my presentations, I volition likely have got a breakdown in addition to get-go crying.)

The tea (especially the vanilla orchard variety) was rattling proficient in addition to at that spot was a proficient render of tea. I observed that to a greater extent than people were drinking tea relatively to previous years. I similar this tendency every bit a tea person.

The tiffin scheme was the weak dot inwards the otherwise keen organization. Lunch is picked up, in addition to since at that spot wasn't a tiffin ballroom, nosotros had to consume tiffin inwards the conference room... facing the screen. This made for a lonely in addition to awkward lunch. Having a tiffin room which forces people to sit down together helps create lead chances acquaintances, which adds a lot to the conference experience. I withal discover it difficult to run into novel people at the conferences. I intend it would hold upwardly genuinely prissy if conferences organized some nerdy ice-breaking events. The demonstrate in addition to poster session inwards Sensys helped a lot for this. Conferences should endeavour to a greater extent than playful things for ice-breaking. Maybe, instead of writing conference call on nametags (duh, everybody inwards attendance knows conference name), write a twitter bio-like self-describing line nigh the person, or what that someone wants to beak about: "ask me nigh crowdsourcing java store line waiting times". Another thought could hold upwardly to acquire people collaborating on an acitivity, game, or challenge. For illustration acquire people inwards attendance collaboratively write/edit/produce a dozen dissimilar conference summaries! Editors in addition to webservices already exists for collaborative editing, in addition to perchance the conference should randomly or purposefully cluster people into these editing groups.

Hmm, perchance I should get-go a conference critiquing business. Just pay my registration in addition to travel, in addition to I am laid :-) I volition write conference critics in addition to reviews for your conference.

Finally, this is my motivation score afterward this conference.

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