3.10 classwork

3.
A) Resolution is the number of distinct pixels in each dimension that can be displayed.
B) One interactive service would be a service like Comcast On Demand. This is a library of movies, tv shows, music videos, and other videos that the user can look through and pick something to watch. Some of these videos are free, while some of them (like movies) are not. Another interactive service that could be provided with a digital tv is a DVR, which allows the user of the television to record shows that are on tv and save them, and then watch them at a later time. They create a library with a certain amount of space made up of these shows, and they are allowed to keep them as long as they want or delete them.
C)Two ways a digital TV can communicate with the digital provider are through the cable box which sends a signal to the digital provider. This could be for the purpose of the user ordering a movie from the interactive service like on demand. Another way the tv communicates with the provider is through the binary digits sent through the air or telephone lines, and this sends information to the tv that is converted into images, which is what the user of the TV watches. This is interactive because they choose the channel which the tv is going to pick up.
D)The growth of video clips on the internet is greatly overtaking the need for digital tv. When a user can go online and watch movies or tv shows on websites like hulu or youtube, it pretty much eliminates the need for a television and cable. The use of youtube or hulu also is free, while cable is not and digital tvs are expensive as well. The only upside to having the tv would be to watch shows in real time, rather than after they occur. For instance, if there is a sports game on, that is time sensitive and the user would want to watch that when it is going on. This element of time is one of the reasons that the growth of video clips online has not completely taken over the need for digital tv. Another reason is that the clips online, or even full movies, come free while on tv they cost money, especially on on demand. The reason tv has stayed alive is due to the need to watch shows when they are happening, and to watch whole shows rather than small clips on youtube. Also, with the emergence of the dvr service the user can tape shows easily and save them on their cable box, and this is very convenient.

4.
A)A key field is a field or set of fields of a database which together form a unique identifier for the database. It is like a category, with it being at the top of the column and then everything under the category in the cells below.
B)The process to find a alphabetical list of all citizens who have had diabetes, do not smoke, and were born after 1990 would be to create a query using the query wizard, and select the key fields that contain names, diabetes, smoke, and birth date. Then under the criteria for the query you would enter yes for diabetes and no for smoker, and then <1.1.1990 for the birth date.
C)The difference between data matching and data mining is that data matching is comparing records in two different databases to find matches, while data mining is the process of finding patterns from large amounts of data. Therefore, with data matching the user is looking to find matches in the data from two different databases, while with data mining the user is instead looking for patterns within the data and not matches.
D)The advantages to medical research minimally outweigh the concerns of some of the citizens about the storage of their data. The reason for the storage of the data, to predict future health problems, is a good one but this does not call for the storage of the data. They want to find patterns of health issues that correspond to the genetic background of the individuals, which is also a good idea but it should be the citizens choice to do this rather than the scientists or government. The citizen has a right to privacy, and this does not include having their blood in a database if they do not want it to be. With this situation, they are encroaching upon the citizens rights by keeping the blood, and although with the use of ID numbers to conceal identities, if a person hacks and gets the ID numbers they could still data match with another database to find the names that match with the ID numbers and find out who has health issues and will. This could be used for very bad purposes. For instance, if the hacker knows that a man will have a heart attack he can find the man and force him to have one and it would automatically look like an accident rather than a murder. Also, this would reveal every Icelandic citizen's diseases that could be used against them.