Thursday, 7 October 2010
Are we close to the dot agile crash?
One of the best articles I have recently read - "Agile Ruined My Life". The situation, from my point, is very like described and greatly reminds to me our position before the dot com crash - the idea by itself is very good, but we were trying to make it work too fast without properly thinking, using wrong tools and with a lot of people who factually lied consuming the idea, not developing that.
Sunday, 3 October 2010
Repost: Wanted: new scientific talent
Repost
Wanted: new scientific talent to support EU policy-making - The Joint Research Centre launches recruitment drive
Researchers from across the EU are encouraged to apply for a challenging and rewarding job in the European Commission's own research body, the Joint Research Centre (JRC). Working for the JRC brings together research excellence in state-of-the-art facilities, and an opportunity to support EU policy makers by providing independent scientific and technical advice. Competitions are open for researchers in the following fields: chemistry, biology and health sciences; physics; structural mechanics; quantitative policy analysis; spatial sciences; environmental sciences; energy sciences and communication/information technology. Candidates can apply on-line between 30 September and 4 November at: www.eu-careers.eu
Read more:
http://www.jrc.ec.europa.eu/index.cfm&id=2300&dt_code=PRL&obj_id=2840
___________________________________________________________________________
EUROPEAN COMMISSION - Joint Research Centre (JRC)
Internal and external communication
SDME 10/78, B-1049 Brussels
http://www.jrc.ec.europa.eu
Email: jrc-press@ec.europa.eu
Tel: +32 2 2957624, Fax: +32 2 2996322
Saturday, 2 October 2010
Simple rules to remember binding business objects to UI in xaml in .Net 4.0
A post for those who are novice in xaml, binding and .Net 4.0
Remeber that
1. variables cannot be bind in xaml, only properties, so when we write in xaml something like
Text="{Binding MyVar, Mode=TwoWay}"
we need to remember to write declaring the classs: instead of
Public MyVar as integer
the following
Public Property MyVar as integer
although
2. You will need to push a notification if you want UI to be updated updating the business object, so use OnPropertyChanged (link) and so writting the full notation (with Get and Set) instead of the short notation we seen above.
3. Don't forget that you either need to rebind lists, or use instead of simply collections like lists and dictionaries an observablecollection etc (link)
Slightly more advance
1. Don't foget that you can use converters binding a property to UI to represent, for example, a boolean value as a picture
<controls:ChildWindow.Resources >
PS: you can easily find in net how to apply the converter in xaml. Besides Utility.ImageHelper.GetImageSource is just illustrative - you will need to write your own code
2. Notice that you can use converter parameters. For example:
but be aware that nature of them is quite static. I mean that you can pass (bind) a property to that, but unfortunately you cannot bind two properties in the effective two way interaction.
Consider for example a simple case: you have a class, which contains an amount and a format to be applied on the amount in UI. you can bind Amount as above, but then you bind the number format, as the parameter is static. OK, you can change it by using the valueconverter as in the item 1 above, to get the entire instance of the class into the convertion function to read both amount and the number format, but then you will lose the two way nature of binding: the convert back will get a number enter, for example, into a text box, but were after convertion it will go? into the entire class? obviously it will not work any longer since you have no reference to the instance to which the inputted property should be placed to. If two way need to be working bind a simple property to make it automatically routed to the right places within the binded instance to be updated following UI update.
Remeber that
1. variables cannot be bind in xaml, only properties, so when we write in xaml something like
Text="{Binding MyVar, Mode=TwoWay}"
we need to remember to write declaring the classs: instead of
Public MyVar as integer
the following
Public Property MyVar as integer
although
2. You will need to push a notification if you want UI to be updated updating the business object, so use OnPropertyChanged (link) and so writting the full notation (with Get and Set) instead of the short notation we seen above.
3. Don't forget that you either need to rebind lists, or use instead of simply collections like lists and dictionaries an observablecollection etc (link)
Slightly more advance
1. Don't foget that you can use converters binding a property to UI to represent, for example, a boolean value as a picture
<controls:ChildWindow.Resources >
<loc:RO_FavImageTypeConverter x:Key="FavConverter" /> </controls:ChildWindow.Resources>
....
<Image Source="{Binding Favorite, Converter={StaticResource FavConverter}}"/>
Public Class RO_FavImageTypeConverter Implements IValueConverter Public Function Convert(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As Globalization.CultureInfo) As Object _ Implements System.Windows.Data.IValueConverter.Convert If value Is Nothing Then Return Nothing Dim bIsFav = DirectCast(value, Boolean) If bIsFav Then Return Utility.ImageHelper.GetImageSource("Resources/favor_yellow.png") Else Return Utility.ImageHelper.GetImageSource("Resources/favor_grey.png") End If End Function
PS: you can easily find in net how to apply the converter in xaml. Besides Utility.ImageHelper.GetImageSource is just illustrative - you will need to write your own code
2. Notice that you can use converter parameters. For example:
Text="{Binding Amount, Mode=TwoWay, Converter={StaticResource nmbFormat}, ConverterParameter='n0'}"
but be aware that nature of them is quite static. I mean that you can pass (bind) a property to that, but unfortunately you cannot bind two properties in the effective two way interaction.
Consider for example a simple case: you have a class, which contains an amount and a format to be applied on the amount in UI. you can bind Amount as above, but then you bind the number format, as the parameter is static. OK, you can change it by using the valueconverter as in the item 1 above, to get the entire instance of the class into the convertion function to read both amount and the number format, but then you will lose the two way nature of binding: the convert back will get a number enter, for example, into a text box, but were after convertion it will go? into the entire class? obviously it will not work any longer since you have no reference to the instance to which the inputted property should be placed to. If two way need to be working bind a simple property to make it automatically routed to the right places within the binded instance to be updated following UI update.
Saturday, 4 September 2010
Simple conclusions from P!=NP battle
All this battle around P!=NP paper can give to an ordinal student a very important hint.
It is nearly clear that there will be a huge demand for algorithms considering NP problems and inventing algorithms that can solve it faster - obviously not as fast as a P problem ... but each, even simple improvement can lead to a huge improvement (in total) on such complex tasks. Besides we still will have to consider
1. Heuristic approaches as those will still be demanded
2. Finding and isolating classes or subclasses of tasks (problems, graphs) which can be solved in P
It is nearly clear that there will be a huge demand for algorithms considering NP problems and inventing algorithms that can solve it faster - obviously not as fast as a P problem ... but each, even simple improvement can lead to a huge improvement (in total) on such complex tasks. Besides we still will have to consider
1. Heuristic approaches as those will still be demanded
2. Finding and isolating classes or subclasses of tasks (problems, graphs) which can be solved in P
Tuesday, 24 August 2010
A post on the scheduling problem
Here is an extremely motivating post about the scheduling problem for beginners with a background in math. Clearly stated easiness for small and ordinal problem and complexity for large scale problems or those, which have different kinds of restrictions. Actually it also refers to this paper, which should be the next step getting into the scheduling problem.
Personally I think it is quite an opportunity for writing a master work for those who hasn't decided yet on a title of their thesis. A lot of work-places has such problems (hospitals, educational centers etc) so it can be treated within the organisation specific restrictions set and so be analytic as well.
Personally I think it is quite an opportunity for writing a master work for those who hasn't decided yet on a title of their thesis. A lot of work-places has such problems (hospitals, educational centers etc) so it can be treated within the organisation specific restrictions set and so be analytic as well.
Saturday, 14 August 2010
End of story II
In continue the previous story. The worst thing about that fact is that you cannot really rely on Google since the technology their are offering on the market can be closed at any moment. They are so new, so modern and so risky to follow.
Here is a short story of such fact a Google graveyard.
Here is a short story of such fact a Google graveyard.
Thursday, 5 August 2010
End of story
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