20140920 Today's expression

Todays's expression==========================================================

- Teenagers are more influenced by the media than might be expected.

- National character is associated with the weather, either directly or indirectly. with climate

- Damage varies according to location or region.

- People studying in English are of any age & walk of life.

- The more longer we defer a decision, the more serious the problem is. will be

- When we think of the Internet, we tend to think of a computer.

- For whatever reason it is unacceptable to kill people.

- First of all, I would touch on basic structure of Korean educational system.

- This will help you make a decision of which is the most desirable.

- There is a sharp difference between ways of dressing according to personality. 

- I believe it important that such claims (should) spread out or be widely known.

- It tells well how the procedure were ignored.

- It is common knowledge that US president Cliton is a womanizer.

- My resentment to Karen is largely due to the fact that she solely occupies a room.

- Television is vital factor in holding a family together.

- It is open to question that Central Bank increased or raised interest rate last month.

Actually, I thought a homework of date mining assigned two days ago would take long time because we should set up a lot of experimental environment like Hadoop and GNU plot. In fact, It just took three hours. Before doing the homework last night, I watched Korean National Ballet performance with my friends, Eunbi. Well it was a great experience to release my stressful life.

Pagerank

- 검색엔진에 검색어를 통해 그것이 포함된 페이지를 찾는 기능도 있지만, 가장 인기 있는 페이지를 찾는 것도 중요한 기능이다.  (Google Page Rank Algorithm) 내 페이지에서 다른 페이지를 링크시키는 것을  Outlink, forward link라고 하고 그 반대도 존재한다.

단지 Inlink가 많다고 해서 인기 있는 페이지일까? 아니다. Source web site의 인지도에 따라서 권위도 다른다. 즉 권위있는 페이지로부터 받은  inlink는 같은 1개의 inlink라고 해도 상대적으로 높은 가중치를 부여해야한다.

그 가중치는  inlink를 보내는 페이지의 전체 outlink수로 나눠서 적용한다.

Shortest Path, as well known as minium cost to evaluate network performance
- 다익스타를 통해 (경로의 길이를 감안해서 간선을 연결하는 것이다. 하나의 시작점과 나머지 정점 경로를 계산한다)

20140919 After doing bull-shit a lot last night

Today's expression ==========================================================

- Where it can apply is in Sports that requires skill and practice.
- Hip hop is more influenced by reggae music than might be thought.
- The other side of the coin is tolerance, an acceptance of people and situation.
- Postures are associated with emotional states, either directly or indirectly.
- The extent of additive varies according to the person and the drug.
- People addicted to drug are of any age and walk of life.
- The longer he continues to take pills, the harder a cure will be.
- This is unlikely unless the anti-pollution law is passed.

- When we think of environment, we tend to think about energy, pollution, and conservation, etc.
- For whatever reason sharing a room with friends is likely pleasure. pleasant
- For whatever reason it is pleasant to share a room with friends.
- First of all, I would touch on the need of discussing the subject.
- This will help (you) decide which is the most proper or appropriate.
- There are sharp differences(contracts) between mode of travel according to gender and income.
- Whales range in length from about 1.3 meters to 5 meters. 


WordCount Example in Hadoop Cluster System.

_First of all, we should know StringTokenizer Class of Java with great flexibility of use in parsing.
- StringTokenizer like what it sounds parse String like split function.
- StringTokenizer has three constructors
{
=StringTokenizer(String str)
=StringTokenizer(String str, String delim)
=StringTokenizer(String str, String delim, boolean returnDelims)
}

-StringTokenizer has some functions
{
=hasMoreToken()
=hasMoreElements()
=nextToken()
=nextToken(String delim)
=nextElement()
=countTokens()


}

20140918

Today's expression ======================================

- A lot of problems of teenagers result from the fact that their parents are too generous. -> A lot of problems with teenagers // too permisive
- The point is that women continue to be considered the second-rate citizen. (be regarded as)
- The underlying idea of renovation (the reform) is even(fair) distribution of wealth.
- There is no doubt that production will be stepped up before long.
- There is no sense in going on strike.
- Customs varies from place to place.
- The book has great flexibility of use.
- This movie begins with a woman's death and ends with her revenge.
- I am very good at fixing  mechanical things.
- First of all, it is important to know what your aptitude is.
- South America is roughly triangular in shape.

- In this regard, eating food is one of the greatest pleasure in life.
- There is no point in improving the situation. trying to improve the situation.
- Personally, I believe Korea will face the challenge successfully.
- The point is that skyscrapers should mus not spoil the landscape.
- The underlying idea of the novel is the family value.
- The method of cooking varies from place to place. Cookery 
- Notebook computers have great flexibility of use.
- I am very good at making friends with strangers.
- It is important to know what your strong point is.
- The observation tower is roughly triangular in shape.

How to recover an error "Sudo mode cann't change"
- Go to recovery mode
- mount -o remount rw /                     = change read-write mode
- chown root:root /usr/lib
- reboot

20140917 Today's development of techonology.

Today's expression==========================================================

- From a medical point of view, he does not show some evidence of illness.
- She have no regard for others' feeling.
- I have no choice but to force (have no alternative but to / have no option but to)
- In economic matters we should make a decision quickly.
- In the course of time, I got accustomed to new surroundings.

- I seldom listen to the traditional music. / classical music
- COMDEX trade show is held in Las Vegas every autumn.
- Fusion food is well received. Foods are well received.
- It turns out to be a big mistake.
- The Koreans, as opposed to the Japanese, are religious.
- I became aware of the fact that all of things start at home. /it all starts at home
- Curiously enough, a few of Americans enjoy Korean food.
- I have no alternative but to leave my dormitory. the dormitory
- In environmental matters, we should predict the future carefully. with great caution.
- In the course of time, beautiful tradition gradually fade away. -> traditions have fade away a little.

- I have never been sick in my life. In this respect (in this regard)  I have been very lucky.
- In view of these circumstances we decided to not take legal action.
- There is no point trying to convince him.
- I will sign the contract on condition that delivery of goods is on time. you deliver goods on time.
- Personally, I believe human beings have the right to equal opportunities.


Python
- Source code does not declare the types of variables or parameters or methods.

- When a Python file is run directly, the special variable "__name__" is set to "__main__". Therefore, it's common to have the boilerplate if __name__ ==... shown above to call a main() function when the module is run directly, but not when the module is imported by some other module.

-We also presented 2 different ways to repeat strings, using the + operator which is more user-friendly, but * also works because it's Python's "repeat" operator, meaning that '-' * 10 gives '----------', a neat way to create an onscreen "line."

- We hinted that * works faster than +, the reason being that * calculates the size of the resulting object once whereas with +, that calculation is made each time + is called. 

- One unusual Python feature is that the whitespace indentation of a piece of code affects its meaning.
- A logical block of statements such as the ones that make up a function should all have the same indentation

- The funny thing in Python ... this code compiles and runs fine so long as the name at runtime is not 'Guido'. Only when a run actually tries to execute the repeeeet() will it notice that there is no such function and raise an error. 
- In this way, various Python modules can name their functions and variables whatever they want, and the variable names won't conflict -- module1.foo is different from module2.foo.

- You can find the documentation of all the Standard Library modules and packages at http://docs.python.org/library.

20140916 after a cheering day

Today's expression==========================================================

- The baby is bigger than on average.
- Chatting on the Internet might be fun.
- It must have been something special.
- It is far from sensible
- It has the same effect as caffeine.
- Most smaller marine mammals are called dolphins
- Worrisome thoughts have adverse effect, while joyous thoughts have beneficial effect.

- The Internet has existed since the late 1960s.
- There are not enough natural resources available.
- The economic situation is getting worse.
- All people have some opinion of a philosophy of life.
- Success and achievement are not necessarily synonymous.
- Backpacking through Europe might be fun.
- It must have been something ominous
- It is far from truth.
- A portable cassette tape recorder is called Walkman.
- A father is a symbol of authority, while a mother is a symbol of giving affection.

- I seldom buy music CDs.
- 88 summer Olympic Games was held in Seoul.
- The orchestra was well received .
- It turns out to be a great success.
- The Koreans, as opposed to the Chinese, drink a beer a lot.
- I base this assertion on some evidence.
- I became aware of the fact that she had been mistaken.
- Either way, the structure of Koreans economy will change.
- This type of publication falls into three categories.
- Curiously enough, she did not lose her job.

20140915 Really tired starting today.

After doing a lot of work last weekend, I am back to my lab in Kaist.


Today expression===========================================================

- The fact of the matters is that a lot of people are concerned with their health.
- This is largely because the Korean culture is male-dominated.
- What surprises me is that usage of the Internet is a kind of addictive.
- Everyone over 18 years-old is entitled to vote.
- I do not think I am qualified for the work.
- I am learning how to play golf.
- I used to study Japanese before.
- I have never considered doing my own business.
- I have great difficulty in getting accustomed to change in my environment.
- (I have great difficulty in adjusting oneself to change in my environment.)

- I have often thought  about changing my job.
- I have been feeling very well in recent months.
- A telephone has existed since the beginning of 20 century.
- Housework involves caring for a family, cleaning house, and doing the laundry.

Adjective 'available' can express noun before or after it. 
- There are not enough computers available.
- Jobs are getting scarcer.
- Everyone has  some opinion of politics.
- It keeps changing
- Work and jobs are not necessarily synonymous.

On average / above average / below average/

20140912 + Hadoop Trouble shooting

Today's expression================================================

-I do not believe (suppose, seem) that I have striking features.
-Once designed, silicon chips are extremely chip to manufacture in bulk.
-I am learning to how to play saxophone.
-I used to drink quite a lot.
-It is doubtful whether the people at large have an opinion(any idea) about revolution of the Internet.
-As far as TV is concerned, 65 percent of teenagers often watch TV.
-I have never considered studying abroad.
-If my memory serves me right, his uncle is a policeman.
-I have great difficulty getting closer to others.
-This house seems to be typical of European building.
-Participants are divided into three separate groups.
-The fact of the matters is that most people are concerned with health-care
-This is largely because the Korean culture is male-dominated.



I will write a motivation letter to TUB for next year.
First of all, I should consider how to organize passages according to what I learnt.

It is doubtful whether my writing would be better than before.


Trouble shooting Hadoop============================================

>>jps 

모든  Node와 Traker가 살아있어야한다.

살아있지 않은 경우에는 검색보다는 

>>vi logs/hadoop-jjoon-datanode-jjoon-Ubuntu.log를 통해서 에러를 확인하고

수정후에 stop-all.sh을 다시하고 hadoop namenode -format을 해주고 다시 start-all.sh해주어야 한다.

20140911

Today's expression ==========================================================
- As I have pointed out, its environmental effect would be disastrous.
- No matter how lone it takes, I will complete my tasks.
- (It is) No wonder that he has a stomach upset after eating too much.
- According to the survey, 24 percent of children watch TV after 9 pm. (9'o clock)
- It is reported that  whales travel at the speed of 56 kilometer per hour. 
// reportedly, reports have it that
- The internet is commonly used to exchange e-mails across people.
- It seems as if he is not worried about school life.
- I am eager to find whether the seminar is open to students or not.
- This is because I like to talk to people I know.
- Brazil is most likely to win the next World Cup Games.
- Even so, getting cellular phones is still against  the rule.
- Reportedly, teenagers' (juvenile's) smoking is so serious.
- The reading passages are divided into two quite different part. (separate)
- The fact of the matter is that the meat is highly concentrated from of nutriment.
- This is largely because fat intake is very low.
- What surprises me is that even teenagers use drug.
- Women are entitled to do what they want on her own.



I made a point of writing English expression in daily from today because I feel like my English writing is getting worse than last year. As the old saying goes, "No pain, no gain"

How to analyze source codes on vim on Linux

How to analyze source codes on vim on Linux

1. installing vim, ctags, cscope

-cscope install : 

http://iamroot.org/wiki/doku.php?id=%EC%8A%A4%ED%84%B0%EB%94%94:cscope_%EC%82%AC%EC%9A%A9%EB%B2%95

2. Source Explorer, NERD Tree, Tag List

source explorer: Tag 기반으로 동작하는 source code explorer로 함수 선언 등을 쉽게 볼 수 있게 해 준다. 함쉬에 커서를 올려놓으면 저절로 해당 함수의 선언부가 source explorer에 뜬다.

NERD Tree: vim을 쓰는 동시에 filesystem을 탐색할 수 있게 해준다. 디렉토리에 들어가거나 파일을 열 수 있다. 창을 바꾸지 않아도 다른 파일을 쉽게 열고 확인할 수 있어서 편하다.

Tag List: 말 그대로 tag list를 생성한다. 소스 코드를 쉽게 파악할 수 있게 해주며, 원하는 함수 혹은 변수 선언부로 쉽게 이동할 수있다.

3.~/.vimrc

I am too lazy.

Reference) 

http://gumdaeng.com/2013/11/07/vim-and-plugins-for-src-analysis/

Tips) Putty zmodem

A lot of things are coming to my mind, these days.

A lot of things are coming to my mind, these days.

When I happened to hear that it must be getting harder than before when you study or research something in a deep, it made me understand why my surrounding problems hurts me.

Now, I really feel that.

In fact, I am not sure it is only depending on my attitude towards things.
I know sometimes I am a kind of a person being pessimist, but, you know, the more I am greedy for my academic things, the more it is stressful.
They would guess my feeling when people are in the academic field in Master's degree or Ph.D.

It has been around my head for more than 6 years. The starting time was probably when I decide to study hard to be a top student in Kyung Hee University, my undergraduate school.

The most intolerable thing is that I could not even guess I would be satisfied with what I will have done after getting Ph,D or what I have really wanted to do.

Shit, I must respect my professor!
Crossed fingers.


Who know the future that I might be a philosopher who can write and say his thought in English fluently?

Right Before Korean Thanksgiving Day

Right Before Korean Thanksgiving Day

Last night, before meeting my friend at midnight I did many things for what to do on holiday, Chuseok. In detail, I installed 'Hadoop cluster' system through Putty, free ssh program, on server which is in my lab. Still, I was really stupid. Actually, to set up the environment to connect server through putty, I learned many thing to do it via a lot of blogs. However, I changed a port without no definite idea. That's because I felt like I had to change the port 80 to 22 when I saw this message from Hadoop 'localhost of which a port is 22 cannot connect to server'

In fact, I should not have done it because my school, KAIST, already blocked a port 22 to block a would-be malicious user connecting to school's server. I was just out of brain. Now, I cannot connect my server and cannot do anything to learn and analyze codes of Hadoop. It was my plan on holiday. 

Damn........

Thus, I set my heart to study a textbook of Hadoop just formally. 

Chapter 1. Meet Hadoop

 The trend is for every individual's data footprint to grow, but perhaps more important, the amount of data generated by machines will be even greater than that generated by people. Machine logs, RFID readers, sensor networks, vehicle GPS traces, retail transactions - all of theses contribute to the growing mountain of data.

Although the storage capacities of hard drives have increased massively over the years, access speeds - the rate at which data can be read from drives - have not kept up. The obvious way to reduce the time is to read from multiple disks at once. Imagine if we had 100 drives, each holding one hundredth of the data. Working in parallel, we could read the data in under two minutes. Plus, we can imagine that the user of such a system would be happy to share access in return for shorter analysis times, and statistically, that their analysis jobs would be likely to be spread over time.

There are more to being able to read and write data in parallel to or from multiple disks, though

Problems 
1) hardware failure in the case that you start using many pieces of hardware, the chance that one will fails is fairly high. A common way of avoiding data loss is through replication.
This is how RAID works, for instance, although Hadoop's file system takes a slightly different approach.
2) most analysis tasks need to be able to combine the data in some way, and data read from one disks may need to be combined with the data from any of the other 99 disks. MapReduce provides a programming model that abstract the problem from disk read and writes, transforming it into a computation over sets of keys and values.

In a nutshell, this is what Hadoop provides: a reliable shared storage and analysis system. The storage is provided by HDFS and analysis by MapReduce.

MapReduce is a batch query processor, and the ability to run an ad hoc query against your whole data set and get the results in a reasonable time is transformative. 


Why can't we use databases with lots of disks to do large-scale batch analysis?
Why is MapReduce needed?

- Seek time is improving more slowly than transfer rate. Seeking is the process of moving the disk's head to a particular place on the disk read or write data. It characterizes the latency of a disk operation, whereas the transfer rates corresponds to a disk's bandwidth.

If the data access patterns is dominated by seeks, it will take longer to read or write large portions of the dataset than streaming through it, which operates at the transfer rate.
On the other hand, for updating a small proportion of records in a database, a traditional B-Tree, RDMS standing for Rational Database Management System (limited by the rate it can perform seeks.) works well, whereas for updating the majority of a database, a B-Tree is less efficient than MapReduce, which users Sort/Merge to rebuild the database.

Another difference between RDBMS and MapReduce is the amount of structure in the data sets on which they operate. The realm of the RDBMS is Structured data organized into entities that have a defined format, such as XML documents or datbase tables performing a certain scheme. Oppositely, Unstructured data of MapReduce dose not have any defined set and works well such as plain text and image data because it is designed to interpret the data at processing time. In other words, the input keys and values for MapReduce are not intrinsic properties of the data, but they are chosen by the person analyzing the data.

Compatibility: three aspects to consider when you move from one release to another.
1) API compatibility - user programs may need to be modified and recompiled.
2) Data compatibility - concerning persistent data and metadata formats
3) Wire compatibility - there are two types of clients who connects with server via wire protocols such as RPC and HTTP. 1) External clients 2) Internal clients 

How to make authorized_key from ssh, meaning it can log in Server without password

How to make authorized_key from ssh, meaning it can log in Server without password as long as we have public key.

How to do it
>sudo apt-get install ssh
>ssh-keygen -t rsa
>ls -al ~/.ssh/    ( Checking id_rsa.pub exists )
>cat  id_rsa.pub >> authorized_keys
>sudo chmod 700 ~/.ssh
>sudo chmod 700 ~/.ssh/id_rsa
>sudo chmod 700 ~/.ssh/authorized_keys

Now, we should do change a port relating to Server because a port, '20', used by remote client is blocked by KAIST.

>sudo vim /etc/ssh/sshd_config
>In it, check
>Chang the Port and PasswordAuthentication Yes-> No

>sudo service ssh restart

But just for your information, if you want to connect in Windows' putty,
you should convert (id_rsa) to (.ppk) extension file.

It has a lot of work.
Actually, before I wrote this paper, I did many things wrong.
That means I turned around a right way to do this.

Download puttygen.exe on Website / http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html /

Then open this program > import a key from id_rsa made by ssh-keygen -t rsa
> Save a private key > by using this key, now we can log in Server through Putty
> How to do it? > Open putty > SSH > Auth > 'Browse' the private file > Connect!

Finished

How to partition a new disk and format filesystem of the new disk

Partitioning a new disk
>sudo -s
>fdisk -l

>fdisk /dev/sdb : partitioning a new disk
>m for help
>n for adding a new partition
>p for primary
>w

>fdisk -l  : checking it's right

Format file_system of the new disk
>mkfs.ext4 /dev/sdb1

My first essay in September, 2010

In my life, 'Psychopath' I respect at times

The most important things in my life is that we compete with myself, so we should win our timid mind that can disturb our future.

To do so, I think that we have to become 'Psychopath' from time to time. Most people consider 'Psychopath' as negative meaning. This opinion is fact, I don't think so that way.

There are more reasons why, buy I will just talk about some reasons of them. Let me explain why.

In my experience, I read a certain book relevant to Psychology before. At this point of time, I am sorry to you that I do not remember a book's name. These reading passage of book described 'Psychopath' as positive meaning. To be specific, psychopath that we consider as negative meaning is personality that cannot distinguish a diverse range of emotions, such as being sad, happy, gloomy, and so on. Thus, people often think psychopath can raise many crime and unpleasant things.

...

Commenting on his board

http://www..com/130/1029

Mentor talking about something important 0831 at night

Well, you do not know my mentor.

Actually, for me when I was in undergraduate, my father was a mentor for me. 

In fact, I could say my mentor was really willing to changing me a lot.

That's why we got a bunch of troubles after talking about challenge things.

However, after graduating Kyung Hee University, FYI as a top student in my department, I was totally independent from my father. It was good for me to definitely stay alone.

Well, the truth is I have been independent from my parents since I got into military service after I was in the first year of  Kyung Hee University.

Now, in the period of doing Master's Degree in Kaist I feel like I respect two of people as mentors in my life; one person who is my senior two times, the other person who I knew in an academic video.

Okay, cut to the chase. 

According to him, a firm has a limitation of doing good things alone. When the firm cooperate with the other company, the result, the quality of goods and service would be better then that of doing alone. It means that it can be more competitive.

"What do you think is Business alliance?"

To achieve this, we should have negotiating power!.

In fact, there are many exceptions like its size, its kind, its period and so on among partnership, so contract sometimes disappear right away or last long.

The most important thing between partnerships is all the companies win.

p.s) bringing English material from my home.

Thing are goin on 0831

My first vacation in the period of Master's degree is almost done. 

It just has two days to left.

Actually, I suddenly watched a random video about Google's employee working in silicon valley. I got inspiration from there. You know the word, 'inspiration" is always Good!

I had something that came to mind while watching the video.

I realized I changed a lot compared who I was in the second year of high school.

Well, I was really willing to try to enroll in the great university. That's why I did totally my best at that time. Plus, compared to who I was right after serving military service, I am definitely lazy of thinking or doing.

I've never thought I can being lazy for more than one year. 

Now, I got this. I have been becoming lazy since I got into KAIST.

It seems very weird because I entered into the best school in Korea after I did my best before coming here. Still, my thought was just desperate. 

However, the most important thing is that, you know, I do not regret this time.

the matter is just now, meaning the bright future is just depending on my attitude towards things surrounding me. 

0831 after watching "스타특강"

Keywords, today) Mailing to him, Scheduler, Hosting attitude, To pick me up, Story line when I present something, Blogging, Social networking to people associated with my field.

How to know computer specification on Ubuntu

How to know computer specification on Ubuntu

information about HDD or SSD
:>df -h

information about memory and cpu
:>cat /proc/meminfo or cpuinfo

information about Ubuntu version
:>cat /etc/issue

Messy one 0827

The large amount of works for what I've prepared just got mixed up, today.

Get a grip, dude.

Do not forget this sentence; it would be still hard to draw a line between the reality and the ideal.

How to arrange a paper

1) A list you should organize above a paper
- why you read this paper? what is that for?
- what kind of a problem this paper solve?
- How to solve?
- Pros and Cons
- Applicable method

2) How to read a paper
- Highlighting an important part by a marker
- Arranging the part next to it by using a red pen
- On reading a paper if you think an expression is applicable, taking a note for later.
- Making a comment easily about tables and figures

3) Using a free reference manager like Mendeley, OneNote, and so on.

4) Posting on a blog
- A title on a blog is not a a "title", but specification of a paper
- Writing title/authors/conference/date/pages before explaining about a paper
- Explaining about a paper
- Scanning if you want