Mehmet Ali Ertürk

Simulating Wireless Sensor Network with OMNet++ on Mac OS X Lion

admin — Fri, 16 Mar 2012 16:11:16 +0000

There are several network simulators available which are design for different purposes. Quick google will result survey papers discussing these simulator both advantages, disadvantages and usage areas. After deep diving into these simulator environments, OMNeT++ is the best logical option for simulating WSN (Wireless Sensor Networks). OMNeT++ is available as commercial and academic uses and actively developed.

Also, OMNeT++ provides infrastructure to develop components top off on it and WSN is available as 3rd party component. OMNeT++ models are available in its website. Mixim is a modeling framework for mobility and fixed networks which is necessary simulating wireless networks with OMNeT++.

OMNeT++ 4.2.1 and MiXiM 2.2.1 is greatly integrated and works well under Mac OS X Lion. After installing OMNeT++ MiXiM is imported into workspace and compiled under OMNeT++. To be able to compile and build tools latest XCode version is needed.

Status Update

admin — Tue, 14 Feb 2012 00:13:37 +0000

I’m still getting Semantic Web topic suggestions emails from MS/PhD students however, I’m not working on Semantic Web directly, for some reasons I changed my main focus to Computer Networks and Networking related topics.

Currently, carrying out an NFC (Near Field Communication) R&D project supported by Minister of Science, Industry and Technology. My PhD thesis supposed to be on NFC related subject, I have some ideas on Health Care Systems and NFC but not finalized yet.

Also, trying to finish a paper for ICNFI 2012.

Making Rounded UIView’ on iPhone

admin — Sun, 08 Jan 2012 15:17:17 +0000

I have started developing (mainly) iPhone apps late 2009 and I feel like I have some experience on iOS platform that I can share. I won’t be doing tutorial serias but just some tips and tricks.

Let’s start with some ui tips, there are 2 ways to make rounded views in iPhone. One is using layers which is inefficient way, second is using quartz in drawRect.

Using layers is really simple;

YourView *vw = [[YourView alloc] initWithFrame:CGRectMake(20, 20, 80, 80)]; vw.layer.cornerRadius = 16; vw.layer.masksToBounds = YES;

simple. The right way is to handle in drawRect;
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(16.0, 16.0)]; //Add a bezier path [path addClip]; // and clip

Both two will same view.

iPhone 4S Camera Test 3

admin — Mon, 19 Dec 2011 09:13:35 +0000

I see my blog turns into iPhone Blog but I like this device This weekend I took some photos from my new toy new photos are taken in a cloudy day. I’ll try to take samples from different light conditions.

iPhone 4S Video Test

admin — Mon, 12 Dec 2011 12:39:55 +0000

Here is a sample video take by iPhone 4S.

You have to visit this link to see it in full HD.

iPhone 4S Camera Test 2

admin — Sat, 10 Dec 2011 16:41:56 +0000

Here some photos taken by iPhone 4S.

About iPhone 4S Sim Failure & Batter Usage

admin — Thu, 08 Dec 2011 14:55:40 +0000

There are hundreds of posts & thousands of page views about iPhone 4S Batter Life at Apple Support Forums. A few days, I’ve faced same problems a few days like I had no sim and sim failure errors, network losses and a few hours with full charge ! It seems problem is related directly with Apple but still there are solutions, at least two things worked for me;

1 – Changing SIM card with new one ( currently 64Kb micro sim ) solved network loss and sim failure errors.
2 – Turning off a few location based services;

Settings -> Location Services On -> Siri Off
Settings -> Location Services -> System Services -> Cell Network Search & Compass Calibration is On and everything else Off.

The result is surprising, my iphone batter is 70 % with 1 day standby and 1 hour usage.

Update

You can still have 2 days standby with a few hours usage.

iPhone 4S Camera Test 1

admin — Tue, 06 Dec 2011 16:01:05 +0000

New iPhone’s camera is much better than expected, still I’m playing with camera. So, Its too early to evaluate and compare with other devices. What I want is to share two photos taken through this device.

Finally iPhone 4S is Here

admin — Fri, 02 Dec 2011 18:16:55 +0000

Siri is amazing ….

Internet of Things

admin — Mon, 28 Nov 2011 11:42:04 +0000

Internet of Things(IoT) is an interesting topic in computer science. The idea behind IoT is, enabling everyday objects in the Internet through RFID tags, sensors, mobile devices …etc. There is an interesting study made by Latitude Labs with kids and their expectations from Internet. Sum results from study;