The chapter on indexing methods was interesting. I like reading about the different methods and about the hardware constraints on indexing. I am not clear, though, on what the practical implications of these hardware constraints are. Clearly we are talking about fractions of seconds difference among indexing methods, and these add up to be significant issues, but what types of real-world differences are we talking about?
As for the compression chapter. Not much to say here.
I am enjoying this class greatly!
Jan 17, 2010
Jan 10, 2010
IR: Reading Notes Unit 2
Reading through the assignment for Introduction to Information Retrieval I was struck by how many of the basic indexing, posting lists, and tolerant retrieval I had covered in my previous programming work. Given that the details that we have been exposed to in this first reading assignment are likely quite elementary, I am curious to see how complicated these IR systems can become.
One point that was a touch confusing to me in the reading had to do with the permuterm index. I am not entirely clear on how rotating the term in question as mentioned on pages 53 and 54 of IIR helps resolve the wildcard query problem. Any chance we could have this explained a little more clearly in class this week?
One point that was a touch confusing to me in the reading had to do with the permuterm index. I am not entirely clear on how rotating the term in question as mentioned on pages 53 and 54 of IIR helps resolve the wildcard query problem. Any chance we could have this explained a little more clearly in class this week?
Nov 29, 2009
Economics and Security Notes...
The Arms article on access management (Arms, 1998) provides a good overview of what must have been a fairly preliminary set of ideas on how to provide secure access to digital materials. I wonder if the article is still relevant, that is, are the policies for access management, more or less, still in place today? Have those policies changed a little, a lot?
The Lesk article gives a good overview of economic issues facing libraries. One of the main and most relevant points the Lesk makes is that with additional services that libraries are providing, the cost of those services must be made up somehow. How to make up that cost difference is an important consideration for libraries. A number of pay for service options are listed in the article, but it doesn't occur to me that any of them are actually being used in any significant way for DLs with the exception of the no-fee model. Is it even realistic for DLs to think about charging for information? Have any libraries (academic or otherwise) moved to a charge for service model for digital or analog information access?
The Lesk article gives a good overview of economic issues facing libraries. One of the main and most relevant points the Lesk makes is that with additional services that libraries are providing, the cost of those services must be made up somehow. How to make up that cost difference is an important consideration for libraries. A number of pay for service options are listed in the article, but it doesn't occur to me that any of them are actually being used in any significant way for DLs with the exception of the no-fee model. Is it even realistic for DLs to think about charging for information? Have any libraries (academic or otherwise) moved to a charge for service model for digital or analog information access?
Social Issues - Muddiest Points
Given our discussion of internet access worldwide, and the speculation that much of the increase in access in Asia and Africa is due to access via cellular telephones, do we have any good examples of DLs that are easily accessible or readable by smart phone? What types of DL applications can we envision that would use a smart phone rather than a PC as the primary user interface platform?
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