All posts by tatho1

Student at The University of Huddersfield. BSc(Hons) Secure and Forensic Computing.

Experimental Li-Fi Reaching Speeds Up To 224Gbps

Researchers have been developing a new way of transmitting signals with light instead of radio frequency waves intended to replace Wi-Fi infrastructure. This experimental technology will be capable of carrying speeds of 224Gbps (28GB/s) throughput.

To put into perspective, even the newest routers with latest IEEE 802 standards do not even support close to the speed of Li-Fi. So let’s compare the current standard (802.11ac) to its predecessor (802.11n); not only did they double the spatial streams (multiple transmit and receive antennas) from 4 to 8, and channel width (wider channels, more data) from 40MHz to 80MHz; they also quadrupled the spectral efficiency from 64 to 256 (number of signals able to be transmitted over same frequency). Then you have beamforming that was also present in 802.11n (where it increases throughput by transmitting signals in a directional manner with tracking); however was not implemented as a standard therefore caused interoperability issues.

802.11ac operates on the 5GHz frequency band where attenuation occurs faster at such high frequencies – compared to 2.4GHz present in previous standards; therefore signal attenuation will occur as it is propagated through a medium, i.e. your router is on the other side of a wall. Li-Fi however, can be installed in every single room.

Currently 802.11ac is marketed at speeds of 1.3Gbps (166 MB/s); however, real world tests resulted in speeds of 364Mbps (45.5MB/s). Even at its theoretical maximum running at ~7gbps (~875MB/s) it still would not be anywhere near the speed of Li-Fi.

 

Advertisements

Japanese Construction Giant Proposes Space Elevator by 2050

Obayashi Corp. has drafted plans to build a space elevator that transports passengers to a space station approximately 22,000 miles high. However, it would take about 7 days to reach. The company described that this technology was viable due to the development of carbon nanotube technology.

The cable that would carry passengers into space would be held into place by a counterweight. The ‘cable car’ is specified to carry around 30 persons. The speed of travel reported by Wired UK is said to be as fast as a high speed train, but nowhere near as comparable to space shuttles that are capable of travelling 28,000 km/h.

On the other hand, speed may not always be the better option in terms of cost. ABC News state that ‘using a space shuttle costs about $22,000 per kilogram to take cargo into space. For the space elevator, the estimate is about $200’, which is approximately one hundredth of the current costs.

Other concerns are how much the whole project would cost from start to finish. Obayashi spokesperson Yomiuri Shimbun informed ‘At this moment, we cannot estimate the cost for the project… However, we’ll try to make steady progress so that it won’t end just up as simply a dream.’

Yale Professor Creates Super Smartphone Cases 3 Times Stronger Than Steel

Smartphone cases are about to get even more durable according to Yale University professor, Jan Schroers. The material is said to be 50 times harder than plastic and 3 times harder than steel. The professor has even designed integrated buttons to access volume and power buttons for example, all while keeping it thin and lightweight.

The manufacturing process has been referred to as ‘thermoplastic forming’ by Scroers, by utilising a supercooled liquid state. Other intricate components can be formed using this process, such as components found in watches.

Travelling Southeast Asia and Japan

So I recently returned from a pretty amazing trip and I’m slowly adjusting back to normal life. In total there were 15 separate flights I had to take, there were endless amounts of sights to see, endured temperatures up to 40c(!), ate delicious local food, made new friends, had interesting new experiences and had a really good time.

I think I’ll make separate posts instead of making a really long blog post. There are too many pictures!

I decided to use Kuala Lumpur as a hub to travel and get to other places, I thought this would be easier and I can also take advantage of budget airline promotions and fares.

Android 4.1.1 Jellybean Arrives for The HTC One X

Three network rolled out an OTA update for HTC One X users to Android 4.1.1 at the beginning of this month. This promises to bring exciting new features to the handset including having HTC Sense 4+ UI.

One thing that is noticeable is when the screen changes orientation, this seems to be more snappier than before.

Another aspect is the new, sleek looking notifications bar which now has a nice big digital clock and the option to enable or disable power saver mode. This can be quite handy as you won’t need to go through several menus in the settings to get to it. Notifications of the same type can be expanded; such as emails, which is a neat feature to have.
[pic]

There is also the introduction of Google Now which can be activated by long pressing the home button. The idea is to show smart information that relates to the user. Currently the cards that are available to my particular device are weather, ETA to commute home and photo spots nearby.
[pic]

The behaviour of scrolling horizontally between homescreens has now changed. The user is now able to continue scrolling in one horizontal direction infinitely, such that when it reaches the end of the homescreen at either end, it would loop back on itself. Prior to the update one would have to scroll back and forth.

When opening the Gallery app the user is greeted with several icons. Clicking on the thumbnail labelled ‘My phone’ will show the user the photos on the phone. I was surprised to see that the layout has changed, photos are now ordered in a tile fashion, with time and location data. For those who wish to revert to the old style can do so by the drop down button and selecting ‘Albums’ instead of ‘Events’.
[pic]

The Camera app has added a ‘switch camera’ button for easier access, and there is also the addition of information that displays how many photos you can take and how much video you can capture.
[pic]

There is the addition of map view whereby it uses the geo-location data for photos taken on the phone and displays them on a map.
[pic]

Those who are still to receive the update can manually check by heading to Settings -> About Phone -> Software Updates then select ‘Check now’. The update is around 360MB so those on a limited data plan are advised to do this over WiFi. Don’t forget to ensure the phone is on charge or has enough battery, and it is also recommended to back up data.

A Backpacking Adventure Inspired by ‘The Ultimate Train Challenge’

I’ve been using Google Currents recently on my smartphone (can be found on the Play store here), in which I came across something that looked very interesting and something that I would love to engage in. I originally considered the challenge, but I am going to do the Great Indo-China loop. I will be also considering Japan and Malaysia while I’m in that area of the world! More about this further down.

The Ultimate Train Challenge, was inspired by Michael Hodson, who wondered what the longest train journey would be. Travellers begin their journey in Lisbon either solo or in a group. Their travels will take them across 15,000 miles of train track and the destination is Saigon, Vietnam. To partake in the challenge, travellers must travel in the month of May only, and be on a train at least once every day. The idea is to make a continuous train journey. The route can be reversed, for those who live on the other side of the world to make things easier.

transiberian

After serious thought about this I was very close to participating, bearing in mind that there would be plenty of time to stop in various countries to do a bit of sightseeing. To successfully complete this, one would obviously require a visa for those countries that you pass through. Passing through Russia seemed to be easier, staying in one country rather than skipping through many. The only thing was obtaining a Russian visa, which apparently could take up to 4 weeks to process and may require multiple attempts.

If I was to participate, I would have flown to Lisbon, and made my way to Moscow with the help of an InterRail Global Pass (link here). From there I would take the Trans-Manchurian express which would take me from Moscow to Beijing, this journey takes 6 days to travel across Russia, wow! Then from Beijing to Vietnam, the finish line! From there I would probably flown home. At the moment I don’t have enough funding for this epic journey across the globe.

As mentioned earlier, I will be doing the Great Indo China loop. The countries that it consists of is Thailand, Cambodia, Laos and Vietnam. Luckily I have a friend in Thailand, and a friend in Vietnam, who is travelling Cambodia and Laos with me. At the end of my travels, I am strongly considering going to Japan, but it would mean that I need to travel to Kuala Lumpur, Malaysia to get a cheap return flight there. A friend of mine will be in Japan, all the more to go, plus I get to visit Kuala Lumpur, great! 😀

Playing Tetris After Traumatic Event Reduces Occurrence of Negative Flashbacks

I found quite an interesting article today. Here’s some background information. Researchers conducted an experiment on healthy subjects and showed them a traumatic film with graphic images. Dr Emily Holmes from Oxford University says;

Our latest findings suggest Tetris is still effective as long as it’s played within a four hour window after viewing a stressful film‘.

She adds, ‘Whilst playing Tetris can reduce flashback type memories without wiping out the ability to make sense of the event, we have shown that not all computer games have this beneficial effect – some may have a detrimental effect on how people deal with traumatic memories‘.

Wow! Who’d think that a classic puzzle game would have such an effect? Also highlighted in the article, games which have the player answer general knowledge questions actually increase the occurrence of flashbacks. Link to the article here. Credits to Oxford University.

First Blog Post

Well well, my first blog post. Let me introduce myself. I’m Tat. Often people would ask, “Is that short for something?” No, that’s my real name.

The main purpose of this blog is to unload my thoughts and write about certain things in my life or maybe even be a source of entertainment as time passes. It could also be considered as a chronicle from pre-university me, ’til I graduate, and most possibly beyond, in which I can look back on; though it is inevitable the theme of my writings will shift between different topics as I do not plan to focus on anything specific.

This would also be a new experience to me as I have never blogged before.