After talking about this issue last lecture with you in front of the blackboard and being prepared for any feedback (although none given - -), I understood the issue more to details than before.
Since my understand of what the powers of the Matrix donates and why it is was all presented in the class so in this blog I want to talk about some other thinking about it.
In X, there are some elements showed as "-", which means undefined. But when doing calculations of X, "-" is calculated just as "0". So at first there were some seconds when I was puzzled why use such a strange sign instead of defining it as zero directly? Indeed that's more like a matrix than that with some "-"s, isn't it?
Not until when I tried to explain the issus I explained to you last lecture that I understood it better. In my opinion, elements in X not only shows whether two points are combined, but also suggest a corresponding
relation. That's about what I said before in the class, when and only when two elements of the same location in the row vector and column vector has the same non-zero value can we get a non-zero result. So maybe I shouldn't say that "-" is calculated just as "0". "-" still has its own calculation function, and it just can't contribute new variables to the result.
Still in X, all the meaningful and non-zero elements have the same power: 1. Why is it?
I have three ideas about this question.
1. The first idea comes from the first glance at the matrix. Just as the old thinking in the binary system: 1 represents "there be" and 0 represents "there not be". And a point doesn't need to reach itself so it's "-", undefined.
2. The second idea comes from the conclusion of the meaning of the powers of a matrix. 1 shows two points are combined. And what's more, since in X, we only have one step to take, so if we can and we want to reach another point, we can only go for it directly, no other ways. So the elements can't have other values than 1.
3. The last idea comes from the process I tried to explain the reason of the meaning for the powers of a matrix. Since all the calculable elements have the power of 1, all the variables added to the result of an element in X.^2 is 1. How many 1s are added here corresponds to the number of middle points here. Only with such defination can we have the wanted effects in X.^2, or X.^n (n>=2).
That's some of my thinking about the powers of a matrix in SNA.
Hoping for more ideas ~~~
2012年11月17日星期六
2012年11月5日星期一
Individual Work and Group Work
The last class of last Tuesday had brought us an interesting activity, where we can experience both individual work and group work on a task and then really feel the differences.
-- Answers to Class Activity One
Definition:
Application:
A Social Computation Cloud
A Social Storage Cloud
A Social Collaborative Cloud
A Social Cloud for Public Science
An Enterprise Social Cloud
-- What was the epistemic aims in (1) Class Activity One (individual work) and (2) Class Activity Two (group work)?
-- Is there any differences in terms of individual and group epistemic cognition, how?
I thint the epistemic aims in Activity One is to come up with an idea of a problem. It about a improvement from "not know" to "know" or "not solved" to "solved", even from "there not be" to "there be". Also, it's all about completing something with one's own work. There is no others' idea, and no others' guide, either. While Activity Two is to come up with an idea from a group of ideas. Here, others' idea can certainly be a kind of help, or guide, also, can be a kind of interupt (when you find others holding a different idea from yours).
-- How did you approach to the problem individually and in group, respectively? Is there any differences in the processes involved?
As Activity One is something about individual work, I did it all by myself, with my own idea. And when doing it in group, since all of us had already held a certain idea, so the process changed a lot. We took a glance at all our answers, found the most held idea, and then discussed it first. Group discussion can be an opportunity to find different idea, even we had the same answer to the questions in this activity, we can also get new idea of how such answer came about.
There is a little pity that all of us held a common idea in group work, so I haven't experienced the process of ideas being changed by others. But in the project of this course we can experience more group work. I'm looking forward it ~~~
-- Answers to Class Activity One
Definition:
A Social Cloud is a resource and service sharing framework utilizing
relationships established between members of a social network.
Application:
A Social Computation Cloud
A Social Storage Cloud
A Social Collaborative Cloud
A Social Cloud for Public Science
An Enterprise Social Cloud
-- Answers to Class Activity Two
Exactly the same as that of Activity One
Exactly the same as that of Activity One
-- What was the epistemic aims in (1) Class Activity One (individual work) and (2) Class Activity Two (group work)?
-- Is there any differences in terms of individual and group epistemic cognition, how?
I thint the epistemic aims in Activity One is to come up with an idea of a problem. It about a improvement from "not know" to "know" or "not solved" to "solved", even from "there not be" to "there be". Also, it's all about completing something with one's own work. There is no others' idea, and no others' guide, either. While Activity Two is to come up with an idea from a group of ideas. Here, others' idea can certainly be a kind of help, or guide, also, can be a kind of interupt (when you find others holding a different idea from yours).
-- How did you approach to the problem individually and in group, respectively? Is there any differences in the processes involved?
As Activity One is something about individual work, I did it all by myself, with my own idea. And when doing it in group, since all of us had already held a certain idea, so the process changed a lot. We took a glance at all our answers, found the most held idea, and then discussed it first. Group discussion can be an opportunity to find different idea, even we had the same answer to the questions in this activity, we can also get new idea of how such answer came about.
There is a little pity that all of us held a common idea in group work, so I haven't experienced the process of ideas being changed by others. But in the project of this course we can experience more group work. I'm looking forward it ~~~
2012年10月7日星期日
FROM COGNITION TO METACOGNITION -- STH ABOUT WHAT I THINK
During our last class, three new words were introducted to us, all of which were new to me. When I try to learn those processes, I find something in my daily life, which may be able to be combined with that.
Let's think back about what it is first ~
•Kitchener, K. S. (1983) found three level of cognitive activities possible in problem solving:
And in the chart before, cognition is linked to data, metacognition to information, and epistemis cognition to knowledge.
Here I think of two activities in our life, one of which was learning a new course. Going to have the class can be the first step, corresponding to cognition. When teachers give some information or data about the course to us, we have a first glance at the new thing and get a picture of it. Doing homework or other more research about the course can be the second step.
The other one can be the activity of making friends. I got this idea from a talk among my friends yesterday. We all have quite a lot of chance to meet new ones every day. Getting known of someone new seems to be easy and simple. So if we want to make new friends, that can be a good beginning. Maybe it's the level of cogniton? And then comes my thought about the next level. Trying to know someone more, or even understand someone, can be a second step one should make in friends making. Can I link it to metacognition? Formerly, I'm quite unwilling to know someone new. Because I think trying to make friends with people totally unfamiliar is too high-risk for me. What if I found he/she is in fact totally different with me? Then how can I continue the relationship between us? Finally my friends told me that knowing someone can be a good start. Someone will go on to be your friends and someone will stay on being "someone you know only", forever. But that is fine ~ It doesn't mean it's not good to get it a start. So can I say firends and "someone you know only" get distinguished during the level of metacogniton?
That's all my personal thought only, maybe not so exact. Welcome to correct me and you see, I still can't make a clear picture about level 3, epistemic cognition. Are you willing to help me match it to real activities? Thank you ~
Let's think back about what it is first ~
•Kitchener, K. S. (1983) found three level of cognitive activities possible in problem solving:
–Level
1: Cognition
(认知):
individuals memorize, read, write, and perceive
media
(人們记忆，读，写，觉察各項媒体)
–Level 2: Metacognition (元认知):
individuals monitor their own progress when they are engaged in these
first-order tasks (人們监控自己所从事的一阶任务的进展)
–Level 3: Epistemic Cognition (知识认知) :
individuals reflect on the limits of knowing, the certainty of knowing, and
criteria of knowing (人們反思”知”的极限，”知”的确定性，和”知道”的準則)
Here I think of two activities in our life, one of which was learning a new course. Going to have the class can be the first step, corresponding to cognition. When teachers give some information or data about the course to us, we have a first glance at the new thing and get a picture of it. Doing homework or other more research about the course can be the second step.
The other one can be the activity of making friends. I got this idea from a talk among my friends yesterday. We all have quite a lot of chance to meet new ones every day. Getting known of someone new seems to be easy and simple. So if we want to make new friends, that can be a good beginning. Maybe it's the level of cogniton? And then comes my thought about the next level. Trying to know someone more, or even understand someone, can be a second step one should make in friends making. Can I link it to metacognition? Formerly, I'm quite unwilling to know someone new. Because I think trying to make friends with people totally unfamiliar is too high-risk for me. What if I found he/she is in fact totally different with me? Then how can I continue the relationship between us? Finally my friends told me that knowing someone can be a good start. Someone will go on to be your friends and someone will stay on being "someone you know only", forever. But that is fine ~ It doesn't mean it's not good to get it a start. So can I say firends and "someone you know only" get distinguished during the level of metacogniton?
That's all my personal thought only, maybe not so exact. Welcome to correct me and you see, I still can't make a clear picture about level 3, epistemic cognition. Are you willing to help me match it to real activities? Thank you ~
2012年9月23日星期日
BALANCE BETWEEN REAL LIFE AND SOCIAL NETWORK
As a student of engineering, most of time we are facing the computer, working, studying, or entertaining. Social network thus playing an important part in our daily life because we have more chance to check it. When life in social network becomes part of(or a large part of) our daily life, I begin to consider whether social network is a source of distance from real life.
Firstly, please admit me to divide social network into two types in my opinion.
For type one I'll say it's such social network as presenting one's real information and close combined to daily life. One example is Facebook, or renren in mainland China. Users' information on such webs is supposed to be true, like a true name and a true image. And the content on it is also based on reality, about one's work, one's study, and one's life. So reading such content can be somehow like reading one's life. It can be a good way to get closer to life, especially for those who have little time and chance to go out to see many friends face to face, just like us, most time of whose is limited in the library, the lab, the classroom or anywhere in front of the computer.
For type two here can be such social network as creating an ID and acting as a role inside it. Here the example can be twitter, or weibo in mainland China. Users' information on such webs can be totally product of imagination. Certainly, there can be some users willing to show a real life in such webs but it's not necessary, or not most users supposed to do. I'll admit that activity on such webs can be more free, with less responsibility. You can only focus on things you like, no considering anything else. You can forget any task in life here, because now you are just your ID. Maybe one will find it brings more happiness because everything here is pleasant(because they are all your choices), and will find friends more easily here(because people here tend to only show what they are fond of, and you'll find those who have the same tastes with you, ignoring other differences between you). But I think it really a source of distance from real life. For content on it is only what you tend to accept, it can be a way of escape. You live somehow in your imagination here. And considering friends made on such social network, in fact you know only a little point of them, your topics are also limited in such little point, let alone maybe you even haven't access to each other's real information. So when you live in real life, friends you need are also friends in real life. When you like life on such social network more, and when you have more friends here than in real life, distance from real life becoms larger.
So that's my point ~~~
Firstly, please admit me to divide social network into two types in my opinion.
For type one I'll say it's such social network as presenting one's real information and close combined to daily life. One example is Facebook, or renren in mainland China. Users' information on such webs is supposed to be true, like a true name and a true image. And the content on it is also based on reality, about one's work, one's study, and one's life. So reading such content can be somehow like reading one's life. It can be a good way to get closer to life, especially for those who have little time and chance to go out to see many friends face to face, just like us, most time of whose is limited in the library, the lab, the classroom or anywhere in front of the computer.
For type two here can be such social network as creating an ID and acting as a role inside it. Here the example can be twitter, or weibo in mainland China. Users' information on such webs can be totally product of imagination. Certainly, there can be some users willing to show a real life in such webs but it's not necessary, or not most users supposed to do. I'll admit that activity on such webs can be more free, with less responsibility. You can only focus on things you like, no considering anything else. You can forget any task in life here, because now you are just your ID. Maybe one will find it brings more happiness because everything here is pleasant(because they are all your choices), and will find friends more easily here(because people here tend to only show what they are fond of, and you'll find those who have the same tastes with you, ignoring other differences between you). But I think it really a source of distance from real life. For content on it is only what you tend to accept, it can be a way of escape. You live somehow in your imagination here. And considering friends made on such social network, in fact you know only a little point of them, your topics are also limited in such little point, let alone maybe you even haven't access to each other's real information. So when you live in real life, friends you need are also friends in real life. When you like life on such social network more, and when you have more friends here than in real life, distance from real life becoms larger.
So that's my point ~~~
2012年9月22日星期六
NEW WAY OF COMMUNICATION
My first entry to social network was somehow kind of compromise. I had to get familiar with this new platform because most of my schoolmates tend to put important notice on it. At that time, I didn't recognise that it would lead to a new way of communication.
Social network has helped me a lot in making friends with new schoolmates since I'm shy to start the first word with someone face to face. I can be free to have a talk only when I'm certain that we are familiar enough with each other. But you see, without the courage to start the first word, nothing will happen next. However, leaving a word on someone's page seems to be more easy for me. By this way, I can get familiar(maybe only psychologically, but that's OK) with many new friends before we finally met, and can be more free to have a talk face to face.
After that first word, friends become friends and then, we come to each other's life through social network. Here social network gives us more opportunity to communicate, no longer limited by time and places. It's really a good chance to keep friends in good touch. In addition, for social network's non-time-limiting, I prefer to leave a message on one's page to sending a short message by cell-phone or making a phone call. Because I can't make sure the one I'm calling is free to answer my message or can make a reply to my message within a short time. And we know, for most of us, checking social network is somehow a sign of being free. Of course, that kind of message is certainly not urgent.
On this platform, I can get information about what my friends are concentrated with, not so intendedly and more freely. Most probably, such information can open a new window for my life. That can be linked with a topic mentioned on 18th, Sep's class. Concerning user-based filtering and item-based filtering, I'll prefer the first one since we need to discover new items that are likely to interest us, not repeat some topics again and again. And friends' interests are most likely to have the potential to be ours.
I think I have got accustomed to this new way of communication and found it really brings convenient to my life.
Social network has helped me a lot in making friends with new schoolmates since I'm shy to start the first word with someone face to face. I can be free to have a talk only when I'm certain that we are familiar enough with each other. But you see, without the courage to start the first word, nothing will happen next. However, leaving a word on someone's page seems to be more easy for me. By this way, I can get familiar(maybe only psychologically, but that's OK) with many new friends before we finally met, and can be more free to have a talk face to face.
After that first word, friends become friends and then, we come to each other's life through social network. Here social network gives us more opportunity to communicate, no longer limited by time and places. It's really a good chance to keep friends in good touch. In addition, for social network's non-time-limiting, I prefer to leave a message on one's page to sending a short message by cell-phone or making a phone call. Because I can't make sure the one I'm calling is free to answer my message or can make a reply to my message within a short time. And we know, for most of us, checking social network is somehow a sign of being free. Of course, that kind of message is certainly not urgent.
On this platform, I can get information about what my friends are concentrated with, not so intendedly and more freely. Most probably, such information can open a new window for my life. That can be linked with a topic mentioned on 18th, Sep's class. Concerning user-based filtering and item-based filtering, I'll prefer the first one since we need to discover new items that are likely to interest us, not repeat some topics again and again. And friends' interests are most likely to have the potential to be ours.
I think I have got accustomed to this new way of communication and found it really brings convenient to my life.
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