Before I start, I am going to answer some question that might pop-up in your mind when you read the title.

Q: What is accelerometer?

A: For the sake of simplicity accelerometer is a device that measures acceleration including gravitation and vibration.

Q: Where can we find it?

A: Decades ago this technology was affordable only for highly funded industries like defense and aerospace, but nowadays we can find it almost everywhere such as iPhone, Wii gamepad, digital camera, car airbag and many more. Thanks to the advancement in MEMS technology. MEMS is abbreviation for Micro-Electro Mechanical System. This technology enables you to build electro mechanical device in a microscopic scale. The picture below might give you the idea about MEMS. The spider mite size is around 0.5 mm to 1 mm.

Mite Approaching the Gear Chain, Courtesy of Sandia National Laboratories, SUMMiTTM Technologies, www.mems.sandia.gov

Q: How does it work?

A: At first it was just a water tube containing air bubble which indicates the direction of the acceleration. Nowadays MEMS accelerometer can be classified to several types based on its sensing elements and principle of operation. The one that I am using is based on polysilicon surface-micromachined sensor. A good further reference about how an accelerometer works can be found here.

Q: Now, what is Inertial Measurement Unit?

A: Inertial Measurement Unit (IMU), which is the combination of accelerometer and gyroscope, senses motions that occur to it. Accelerometer provides us linear acceleration while gyroscope provides us rate angular. By combining those data we can know the angle, that’s basically how tilt measurement in iPhone and Wii gamepad, although those devices only use accelerometer.

Well that’s it for introduction, for further basic information you can search it through website =). What I am going to explain in this article is about how to measure pitch, roll, or yaw using accelerometer.

To measure tilt, you can follow these steps:

1. You need at least 2 axis accelerometers. Two axis accelerometer means that you are going to need two accelerometers that measure two different axis. Try this ADXL203. This sensor already embedded two accelerometers inside a single IC.

   

2. Read the output from both axis. Usually you need Analog to Digital Converter (ADC) to get digital value of the output.
3. Normalize the data. The output from the sensor is always positive. You can check it at their datasheet if you don’t believe me =). Here, I’ll give you a snapshot from the datasheet.

   

   As you noticed from the picture above when the sensor experiencing 0g, the output of the sensor would be 2.5 V*. Let’s say you are using 10 bit ADC, at 0g you’ll get the reading of 512. So all you have to do to normalize the data is by subtracting the ADC data with 512.

   ADC_x,norm = ADC_x,sampled – ADC_@0g
   

   ADC_y,norm = ADC_y,sampled – ADC_@0g
   

4. The next step is using a simple trigonometry equation. See the picture below.

   

   We can find θ by using

   θ = arctan(a_x / a_x)

   θ = arctan((ADC_x,norm . Const) /
   (ADC_x,norm . Const))**

   θ = arctan(ADC_x,norm /ADC_x,norm)

   or in C language

   θ = atan2(ADC_x,norm, ADC_y,norm)
   

The graphic below is an example of data that was taken from a two axis accelerometer. The accelerometer was rotated clockwise and counterclockwise.

The data seemed good enough, but you will notice that if the condition a little bit changed the data would become bad. The graphic below was taken when the accelerometer was rotated clockwise and counterclockwise plus translation movement.

As you can see, the tilt measurement is disturbed when there is translation movement due to measurement of linear translation by the sensor. We can’t compensate this disturbance if we only have accelerometer. The key to overcome this disturbance is by combining this data with data from gyroscope, which I will cover in another article.

*) The 2.5 V at 0g is not always true. It depends on several factor, one of them is the voltage of you power supply.

**) Const is used to transform from ADC data to acceleration (a_x and a_y) in (m/s²).

Reference:

1. http://www.memsuniverse.com/?page_id=1548
2. http://www.analog.com/static/imported-files/data_sheets/ADXL103_203.pdf
3. http://www.sensr.com/pdf/practical-guide-to-accelerometers.pdf

Many experienced practising control engineer are surely able to design a control system. For those of you who wish to be a professional control engineer, you can expect and should consider the designing of a control system as part of your daily life. This post is intended to share little bit of my knowledge about designing a control system. Well actually this is just about as far I know about control design. ^^

The process of designing a control system usually makes many demands of the engineer or engineering team. These demands often emerge in step by step design procedure as follows:

1. Study the system (plant) to be controlled and obtain initial information about the control objectives.
2. Model the system and simplify the model, if necessary.
3. Analyze the resulting model; determine its properties.
4. Decide which variable are to be controlled (controlled outputs).
5. Decide on the measurements and manipulated variables: what sensors and actuators will be used and where will they be placed?
6. Select the control configuration.
7. Decide the type of the controller to be used.
8. Decide on performance specifications, based on the overall control objectives.
9. Design a controller.
10. Analyze the resulting controlled system to see if the specifications are satisfied: and if they are not satisfied, modify the specifications or the type of controller.
11. Simulate the resulting controlled system, either on a computer or a pilot plant.
12. Repeat from step 2, if necessary. ^^
13. Choose hardware and software and implement the controller.
14. Test and validate the control system, and tune the controller on-line, if necessary.

As you can see above, those are the procedures of designing a control system. If you are to design a controller, the easiest way to fulfil your objectives is to make a checklist out of the above requirements, and just make your way up through all of the lists above until, say you want to implement the control system into hardware, then you would have to do it completely until number 14.

That’s it from me, feel free to post comments, corrections or anything, thank you and see you later!

NB: the process of designing a control system above is taken from the book  “MULTIVARIABLE FEEDBACK CONTROL: Analysis and Design” written by Sigurd Skogestad and Ian Postlethwaite.

Hi all, this is my first post at this blog. I decide to make this one short and compact. I hope it would be more understandable this way.

Here we go, human vocal system can be classified into two types of spectrum : voiced, dan unvoiced. Before we go any further, below is an illustrarion of my voice spectrum :

This is my vocal spectrum saying : AlfathAkbar

From this picture, you can see there is some gaps there, makes you think that i stops a while when i say “Al”(stop)”Fath”(stop)”Ak”(stop)”Bar”. But the fact is, i speak from start to end without a single second of silence! So if i speak nonstop, why is there three “band” where my voice magnitude is almost 0 dB? This is why :

Rough analysis on my vocal spectrum

So generally, vocal letters (a,i,u,e,o) is voiced and consonant letters is unvoiced. Here is some depth explanations :

1. Voiced Spectrum

a. Vocal cord (pita suara) vibrates with a pitch frequency

b. Voiced signal can be considered as a periodic signal

c. Signal will change according to the movement of trachea, mouth, and nose.

2. Unvoiced Spectrum

a. Vocal cord doesn’t vibrate

b. The excitation to the vocal tract can be considered as a random noise

c. The energy is relatively small

d. Doesn;t have the characteristic of a periodic signal

One more related fact about this classification, is a decoder of a LPC (Linear Predictive Coding). LPC is a human vocal modelling system. This is the block diagram of LPC decoder :

(on progress)

The noise generator is used to generate the unvoiced spectrum sent by the transmitter. So, we can see that LPC uses this voiced and un-voiced thing as an advantage to model our voice.

That’s it! Thanks for reading.. =)

Based on my experience to take care of all of preparation and administration stuff before going study abroad which was completely tiring TOTALLY COMPLICATED (u know how complicated our bureaucracy is, right??), so by this blog, I want to share it to all of you who someday will go abroad for study too. Insya Allah, it is applicable in any home university in our country. And my intention is that you don’t really have to do the same mistakes and stupidness and get many unlucky things that I did before.

If you are accepted to study abroad in any university in foreign countries, and u decide to go and join it in any programme (could be exchange programme, Master programme, Doctoral programme, research programme, etc), these are te things that you have to take care of :

1. Passport. Make it in the imigration office in your hometown usually..

2. Ticket. Book the ticket for your departure. Have it taken care by a travel agent is the most convenient way I guess, because you can ask for the cheapest but convenient airline due to your budget, unless your ticket is already taken care by the university abroad or the scholarship. For me, I have to purchase it by myself first, and when I arrived in Japan, they will reimburse it. But they told me how much the replacement cost for my airlines before, so u have to consider your airlines according to the budget. My suggestion is book for the ‘open ticket’, it’s a two-ways ticket (including the ticket when u return to Indonesia, but the date of the return ticket can be changed anytime). And if you have booked it, you will get the e-ticket. Keep it along with the receipt until the day of ur departure. In the day of your departure, exchange it with the boarding pass in the E-travel counter of the airline company in the airport. Don’t forget to check which terminal and gate (Terminal and Gate are two different things!) are your departure before u leave for the airport.

3. Visa. It’s a document whereby a government agency gives a citizen of another country permission to (formally request to) enter or leave the country (wikipedia, red.) You have to apply for it in ur destination country’s embassy in Indonesia. Check the visa procedure of your destination country in the embassy website, because it may be different for each country. For Japan, the list prepared things for this application are :

1) Passport (original)

2) Certificate of Eligibilty (will be delivered to you from your destination university, it’s a certificate that you are chosen for study in that university, that’s why u have to live in that country for a certain period of time)

3) Copy of KTP (Kartu Tanda Penduduk)

4) Visa application form (download it from the internet, print it, and fill it before you go to the embassy)

5) Pas photo (for Japan, it’s 4,5 x 4,5, full face have to be able to seen, including your ears. Take off your glasses. And no background color (white).

6) Application cost (for Japan, it’s Rp 250.000,00, single visa)

You apply for it, and after few days, you have to go there again to take the visa. For Japan, it  usually  takes 3 days.

4. Fiscal. It’s amount of money that has to be paid as a tax when u leave for other countries. Now, it’s Rp 1.000.000,-, but you can get it free because of study purpose. So make sure you take care of it too, unless you’re too lazy or u don’t really have time and you’re rich, anyway.. he2… Well, for me, 1 million is more than enough to bring back souvenirs right?! Okay, here’s your requirements :

1) Letter of requesting for free fiscal from the department or faculty of your home university. (Apply for the letter in Tata Usaha, Elektro-Pak Dede). Signed by the head of the department. NOTES : this letter is pointed to : DIREKTORAT KELEMBAGAAN DIRJEN DIKTI. Tembusan : BPKLN (Badan Perencaaan dan Kerjasama Luar Negeri).

2) Letter that declares that u’re accepted and invited to study to the university abroad.

3) Passport (original and copy, but for me, copy is enough, just make sure before u go to Diknas)

4) Copy of the e-ticket

5) Visa (+copy)

6) MOU between your home university and the university that u’re going to attend. Get this MOU in Annex, 6th or 7th floor, I forgot, just find out the division who takes care of MOU. (Don’t forget to copy it, at least 3 copies. I should came back to Bandung, and went to Jkt again the next day, just because I don’t have any copy of this MOU!!! Stupid Mistake!!)

You take care of this letter in Depdiknas office, Senayan,Jakarta, next to FX Mall. Go to the division of BPKLN. And each country has different person who take cares of it. If u’re lucky, u will get this letter signed by the head of BPKLN in that day, if he’s available that day, if he’s not there, u will have to go back the next day. (Attention, it’s just recommendation, not the Permission yet). And you take this letter to Kantor Pelayanan Pajak bagian Bebas Fiskal, at Wisma Aldiron, Pancoran, basement floor. The copy of MOU is needed in this application. And you can have the permission letter of BEBAS FISKAL, the next day in the afternoon. ONce again, if you’re lucky…

Just copy all the documents you have at least 3 copies, and bring them everywhere you go for taking care of all this stuff. Prepare for the worst, okay? Because- I don’t intend to say bad things about my country, but it is FACT when it’s related to OUR BUREAUCRACY it’s GOD-DAMN-COMPLICATED, and they can say different things just in one day, and different person can tell different contrary things). So, please, don’t be a deadliner for this one. It’s possible for you to take a week off just to take care of this stuff and prepare for the money too for the Jakarta-Bandung trip. I passed this route 4 times just to take care of it. You can make it only one time if everything goes right. And, pray for a good luck a lot!!

Other things to prepare :

1. Your luggage. Check the max weight of your luggage in the airline company where u buy the ticket. Usually, if u get the student visa, the max weight is more than tourist visa. For Garuda, it’s 30 kg.

2. Ur daily requirements in ur destination country, that can be bought in Indonesia.

3. All the administration stuff that you have to bring to your destination country.

4. All th administration in your home university that need your signature. If u just go for exchange like me, u’d better prepare for Surat Kuasa and the person that u trust to take care of all registration in ITB. Prepare pas photos and leave it to your friend. It’s needed for KSM registration in each semester.

5. For exchange programme, u should have SURAT IZIN CUTI AKADEMIK. Here is the order :

1) Go to ur own Department’s Tata Usaha and ask for an application letter for this purpose that you will apply for it in Annex. It means the department on your behalf, who applies for Izin Cuti Akademik to the home university. It’s signed by the head of ur department.

2) After this letter is available, u go to Annex, 1st floor, the same counters as we apply for new KSM in each semester. Apply for Surat Izin Cuti Akademik there. And after few days, the Surat Izin Cuti Akademik’s letter will be delivered to the Tata Usaha, and you have to take the letter in Tata Usaha, not Annex.

Keep this letter, make copies of it, bring it with u abroad, and leave the original one in INdonesia, I suggest.

6. For exchange programme too, take care of the REGULAR SEMESTER PAYMENT. When you leave the university temporarily, u still have to pay half of the regular payment per semester. U go to annex, find the Divisi Keuangan, and in front of the room, 2nd floor, there’s an example of the application letter. If you take care of it before the automatically deduction, then u have to apply for the returning half of the payment because of blablabla.. But for the next semester, because u already have the statement that u study abroad, ur family or ur friend can pay it in cash, just half of the SPP. BPPT is not paid. Make sure that u make the Surat Kuasa to take care of this payment to ur family or ur friend, on behalf of you.

7. Bank for transferring money between u in other countries and ur family in Indonesia. Find out the most convenient way to transfer it.

OKay,,this is just the hardest part, and you will be so busy in those days, but it’s okay. After it’s all taken care, you can relax and start thinking about ur own preparation for living abroad, and getting so many souvenirs demand from ur family and friends. Imagining how beautiful your destination country is.. Hahaha…

If there’s any other differences or opinion in this post, please Correct Me If I am Wrong..

hello everyone, this is my first contribute to this blogsite.I want to give some information for you to about power system in Indonesia.Maybe this little information give you more comprehension about power system interconnection in indonesia especially in jawa-bali.

PT PLN PERSERO Penyaluran dan pusat pengatur beban (P3B ) Jawa-Bali is our state –owned electrical company and their function is to manage the energy from power plants to distribution system. Their framework is in transmission and load dispatch. P3B jawa – Bali controls energy that flows to 500kV , 150 kV and 70 kV interconnection system.

PT PLN P3B Jawa-Bali covers Java , Madura , and Bali islands and topology of their interconnection can be seen in picture below.

Jawa – bali interconection was a big system. Their existing capacity is about 20.000 MW and peak load is around 16.000 MW. Electrical consumption in jawa –bali island has a unique charateristic. The load curve has big slope in afternoon at 5 p.m -10 p.m ( 17.00 – 22.00 )

This system mostly controlled automatically and the control system located in gandul ,Jakarta. ( Jawa – Bali Control Center). The Dispatcher responsible of the energy flows to interconnected system and keep it stable when some trouble occurs in system.

P3B Jawa –Bali divided into 4 region. This region has same responsible like in Jawa –Bali Control Center and the region are:

- region 1 ( RJKT ) ; covers jakarta and Banten

- region 2 ( RJBR ); covers west Java

- region 3 ( RJTD ); covers central java and D.I.Y

- region 4 ( RJTR ) ; covers east java and Bali.

Thanks for your time to read this little information and I hope you enjoy that. See you in my post…

for further information you can look at www.pln-jawa-bali.co.id

Next post: electrical consumption in Indonesia

As a crew of basement brat, I have to contribute to this blog by writing a valuable post. But I was confuse, because no good ideas appeared in my head. I wanted to write about control engineering, my submajor in electrical engineering, but I didn’t have a good quality in it. I wanted to write about global financial crises, but it’s not my speciality, I am a electrical engineering student, not economics student. I wanted to write about policy, but I am not politician. So, as blogger I thougt it would be better if I write about blogging tips, how to increase our blog traffic. So more people will visit our blogs and what we written in the blogs will be read by more visitors. Like what I am doing for my “kampanye damai pemilu indonesia 2009 “blog. Before, forgive me if my english quality is not so good, not as good as older posts. But I hope you can understand reading this post, and this post doesn’t decrease basementbrat’s quality.

I am sure when someone creates a blog or site, he has purpose. Maybe with the blog he’ll appreciate his ideas. Or maybe he wants to monetizing the blog, get money from the site. Or maybe he uses his blog just for writing his activities or just for sharing what he feels. There are so many reasons and purposes in blogging or making sites, and everyone has different reasons. But whatever the purposes, I think people make a blog or site to be read by others. So, if we want our sites have many visitors and readers, we have to do some ways to increase visitors number, or increase the site traffic.

To check our site traffic, we can use site counter, so the visitors number can be known. We can also add live traffic widget like feedjit, so the visitors locations will be known.Or we can analyze in google analytics. If we want to check site traffic rank in the world, there are good site, alexa.com. This site gives ranks to all sites in the world by their traffic, or we can call it alexa rank. Please try to check your site in alexa.com, if your alexa rank still over one million, you have to do something to increase your rank.

There are many ways for increasing the site traffic. But I can’t mention them all, I just can write some ways, because I am newbie in this topic.

1. Tell people you have site

This is a manual way to promote your site. Just tell your friends if you have a blog or site, and tell them to open the blog and tell to other friends. You can do this by talk directly, sms, yahoo messenger, friendster, facebook, plurk, put the link in forum signature, join blog aggregators, and other medias. Don’t forget for always remembering them about your site. If your friends have blog too, tell them to add your site into their blogroll, or you can link exchange with them.

2. Optimizing your blog in search engine

This is an interesting way. You have to do Search Engine Optimization (SEO). Make your blog has good rank in search engine results page (SERP). I mean you should try optimizing your blog, so for some keywords, your blog can be in first page or second page in search engine. Why this so important? Because people will search anything in the internet by search engine like google. If your site has good rank in google results pages, people can easier find your blog. The detail about SEO will be written in later paragraphs.

3. Submit your blog in social bookmarking sites

Social bookmarking sites are contained list of sites have been submited there. They will appear your site too, so people who’re opening social bookmarking sites can find your blog. The famous social bookmarking sites are digg,delicious, technorati, furl, stumbleupon, google, yahoo, etc. please register your blog there and get the advantages. It’s free. If you have ever seen logos like these, these are social bookmarking sites logos.

4. Blogwalking and leave comment

Blogwalking means visiting other blogs from one blog to another blog. Blogwalking can helps you to increase traffic. But you have to leave your comment in post you have just read. To comment, fill the name, email and url form. From comments list, other bloggers can find your name then click your name that contained your blog url. If you often leave comments in many other blogs, you’ll be famous in blogging world.

5. Post Hot Topics

If there are events or news that are most being talked by people, try to write them in your blog. Or you can write a controversial topic, because this will invite the visitors. But I don’t suggest it. This has relation with SEO techniques. I prefer mention it, “keywords shooting” or in indonesian “nembak keyword”. The newest and hottest news will make people search them in search engine. If you can post the hot topic and google can indexes your post well, your blog has change to be found in google. And your traffic will increase. Example, today is american president voting, maybe people will search news about vote results in google. You can write something about that.

6. Promote in other ways

Five ways above are the main ways I can explain. If you have a lot of money, you can promote your blog by buying link in advertise sites, put your blog link there. You can also register in review sites as advertiser, and let other bloggers to review your sites in their blogs.

There are still many ways to increase traffic, but I can’t explain them all. Like what I’ve said above, I’ll write about search engine optimization or SEO. You have to make your blog easier to be found in search engine like google, yahoosearch, altavista, cuil, etc. Because google is the most used search engine, I’ll just talk about seo in google.

Google gives rank to the sites in it’s results pages with certain algorithm, and it has many factors. But there are some main factors used by google to shows the search results. The main factors are contents appropriate with keywords and pagerank.

These are some ways to optimizes your site in google:

1. Create Google Friendly Content

What google indexed in sites are contents. Content is relative, depend on every sites. Google will indexes your blog contents and show it in results page if the keyword appropriates with your content. The most important site content is site title. Use blog title do you like, but think, your title is friendly words or not. I suggest to use most typed keywords in google as blog title. Don’t use difficult title like “lsdifdfdijifsdsd” or “siwfdsiewasl” because none will search difficult words like that in google. But don’t use too many certain word repetations in a post if you don’t want google looks it as a word spam, your site can be threw in google sandbox. You must manage the words density in your post. If you want to do “nembak keyword”,trying to speculate what keywords people most typed in google, just use two or three in a post of keywords you want to be optimized, and hightlight them or use bold font in those key phrase. Someday I tried to shoot “film laskar pelangi” key phrase, and my blog www.gareng.net could be in first position in google.co.id for several days. This is the screenshot,

Ths time, I try to optimize “Kampanye Damai Pemilu Indonesia 2009” keyword. If you want to know what is the most typed keyword in google, you can use this tool. You can choose region and time range. And the long tail keyword also can be known. For last 30 days, the most typed keyword in indonesia is friendster. Maybe you can ‘nembak keyword’ with write about friendster.

2. Pagerank and backlink

Pagerank is important factor di google algorithm. Pagerank is rank from 0 to 10 given by google to every sites. My blog www.gareng.net was given pagerank 5 by google. It made me very happy, because not every bloggers are given PR5. The high pagerank and good content site must be has good result in google serp. For me, pagerank is still misterious thing. I don’t know certainly how google give pagerank to every sites. But I think my pagerank will increase if many incoming links come to my blog, many other sites link my blog. So, you have to search backlinks as many as possible. Google doesn’t see a blog by it’s traffic, but how many and who gives baclinks. So, don’t think if your blog has high traffic, it’s guaranted to be good result in google. There are many ways to get backlinks and increase pagerank.

• Tell your friends to put your link url into your friend’s blogroll.

• Make a dummy blog as many as possible, make your other blogs and put your link in your new blog. You should also make pingbacks among your dummy blogs, the most effective backlinks is three ways backlink. If you have blog A, B and C, let A to link B, B link C, and C link A.

• Submit your blog into blog directories like dmoz, dir.yahoo.com, topofblogs, topbloglist,etc.

• Submit your blog’s feed to feed directories. this blog feed is http://basementbrat.wordpress.com/feed

• Leave comments in dofollow blogs. Dofollow blog let you to get backlink if you leave comment and url. My blog www.gareng.net is dofollow. Deviantart blogs are dofollow too, they can be backlinks field. But default wordpress blog like my kampanye damai pemilu indonesia 2009 blog is not dofollow.

• Join web forums and put link in your signature

• Put link in the your facebook profile, friendster profile, twitter, plurk, and other social networking sites.

• Be member of blogger communities and submit your blog into their blog aggregators.

• Buy links if you have a lot of money

3. Submit your blog url in google

You can submit your url in google here. I don’t know this way effective or not, but I think nothing wrong with trying.

4. Submit your sitemap in google webmaster central

If you have self hosted wordpress blog like my blog www.gareng.net, or maybe you have your own blog, you should generate the sitemap and put the xml sitemap file into your blog root directory, then submit it in google webmaster central. This will very help google to crawl your blog. To generate the sitemap, for wordpress users can use google sitemap generator plugin. But for wordpress.com users, I am sorry you can’t use this fasility.

5. Optimize meta tag

You can add meta tag in your blog’s head, beetwen tag <head> and </head>. Use meta description to descript your blog. Write description in content.

<meta name=”description” content=”write your blog description here, about 25 words”>

And use meta keyword for keywords you want to be optimized. Separate keywords by comma. 10 words are enough.

<meta name=”keywords” content=”busby seo test, busby, seo, test, seo contest, busby seo challenge, worldcup, search engine optimization, google”>

But, this is also just for self hosted blog and blogspot.com, not for wordpress.com blog. If you use self hosted wordpress blog, you don’t need to do this, just try easy way with plugin all in one seo pack. If you want certain visitor location marketing target, you can use meta geo tag.

6. Permalink

Permalink is permanent link to our post pages. As example, this post has permalink http://basementbrat.wordpress.com/2008/11/06/how-to-increase-blog-traffic but if you want to your permalink more seo friendly, use the structure like this

http://basementbrat.wordpress.com/how-to-increase-blog-traffic.html

In self hosted wordpress blog, you can set the permalink like this /%postname%.html

But if your blog was hosted in wordpress.com, you can’t change it.

7. Internal link

Internal link is link in site itself. Try to make many links between your pages. This will help google easily find pages in your site. Minimize number of outbond links or minimize linking other blogs. The good blog is blog with number of inbound links (backlinks) more than outbond links.

8. Use SEO tools

There are so many tools for SEO and good seo website. You can find them in http://seo.alltop.com

9. Try jurus-jurus SEO

You can find post about seo tips and techniques here. These are tips from indonesian bloggers.

I think these are just some tips, there are still many other SEO techniques. I am just a newbie,I am trying to learn about seo by join a SEO contest named Busby SEO Test. In this SEO contest, participants should optimize their blog with key phrase Busby SEO Test to win $5000. Participants are given 4 months from 1 October 2008 until 31 January 2009. I have a website in http://umpcinfo.com/gladioolers, and now still in 4^th page in google. I need your support, I need many backlinks. I hope you would like to support me in this seo worldcup by put that link into your blogroll with anchor text Busby SEO Test. Thank you very much for your supports for indonesian team.

I think this is enough. I am sorry for wrong words and my bad english. Please leave your comments, suggestions or critics. I hope this post will give us advantages. Thanks….

-EEng-

]]> http://basementbrat.wordpress.com/2008/11/06/how-to-increase-blog-traffic/feed/ 11 enkz bookmark film laskar pelangi http://basementbrat.wordpress.com/2008/11/01/how-much-the-maximum-amount-of-voltage-that-our-body-can-resist/ http://basementbrat.wordpress.com/2008/11/01/how-much-the-maximum-amount-of-voltage-that-our-body-can-resist/#comments Sat, 01 Nov 2008 14:56:07 +0000 wahidyankf http://basementbrat.wordpress.com/?p=68 ]]>

Have you ever heard these sentences?

Be careful if u want to connect an electronic device…cause u can taste a

short circuit…

or

“hei…if u wanna repair your electrical installation, dont forget to use your

sandals…”

or maybe

“we will not be electrocuted when we use our sandals…”

In this post i will share my knowledge about these things. A knowledge that i got from my electromagnetic field’s class. The lecturer of this class is “eyang bambang anggoro”, one of the most inspiring lecturer in ITB’s School of Electrical Engineering and Informatics. I hope this post can be useful to us. And can make us more careful when we use electrical devices in our daily live.

Have a nice read!

Basically, all the things in earth can conduct electrical current. But, with different capability of course. There are things that can conduct electrical current with a good capabilities, those are things that we called conductor (most of them are metals, like bronze, gold, etc). There are things that have bad electrical current conduction, we called them isolator (Ex : woods, plastic, paper, etc). And also there are things that can conduct electrical current based on thermal condition around them, we call it semiconductor. At general, there are basic electrical properties. They are Resistance, Current, and Voltage. To understand these things, we can use street’s modelling. Here are these electrical properties modelling :

1. Resistance or we usually write R in electrical engineering.

If we compare it to the street, we can presuppose it as a level of road’s smoothness. It’s a logical thing that a car can drive flawlessly if the road is smooth, without any hole in the way. The bigger the resistance means bigger effort to cross the road, and vice versa.

2. Current or we usually write I in electrical engineering.

In this modelling, current is amount of car that may go accross the road per time scale. This amount of current has inverse relationship with road’s level of smoothness. What do you think if a car going through a road that is full of hole n rocks? It’s speed will become slower than when it’s travelling in smooth circuit. So, bigger Resistance means lower current accross the lane.

3. Potensial differences, or in electrical engineering we usually called voltage (V).

Let us imagine that the road is connecting Jakarta (name of the biggest city in Indonesia) and Bekasi (name of satellite city of jakarta, the citizens of Bekasi are usually working in offices located in Jakarta). When we use this modelling, voltage is the career oportunity in either city. Why people want to have a career in Jakarta? because the chance to become wealthy in Jakarta is bigger than in Bekasi. In order to do that, the people from Bekasi will make a journey to Jakarta to obtain their career. When will this humanoid current stop flowing? the answer is, when there are no potential differences between these cities. So do with potential differences, the electrical current will stop flowing when there are no potential differences between 2 point (eg. when the battery is leak).

In electrical engineering, point one, two, and three have a relation like this :

V = I x R

This equation means :

1. Bigger resistance means lower current going through the electrical circuit.

2. Bigger voltage means bigger electrical current through the electrical circuit.

Now, we go back to our heart. Our heart has natural resistance for about 5 kilo ohms (ohm is an electrical measurement unit for resistance). Our heart also have the maximum amount of current that can cross the lane for about 10 mili amperes (ampere is an electrical measurement unit for electrical current), where if we go accross the limit of this maximum value, our heart will have an abnormal function. And our heart will stop working when the electrical current accross our heart is about 15-20 mili amperes. Unfortunately, women have lower maximum electrical current that can cross their heart than men, they only need lower than 10 mili ampere to make their heart malfunctioned. We can compare this maximum electrical current with the road model. The traffic in the road will flow normally if the speed car accross the road is not too much, neither too slow. This is the reason why we often see maximum and minimum speed limit on the road. What do you think will happen if there are a cars that run too fast? There will be a crash on the road! so with our heart. We can’t let electrical current run too fast, neither too slow.

From this logic, now we go to scientifical equation for our heart. Above, we have equation :

V = I x R

If we calculate the variable of our heart, we can get the maximum voltage that our body can endure :

V = 10 mili Ampere x 5 Kilo Ohm

V = 50 Volts

And if we compare this value to our PLN’s (Indonesian State-owned Electrical Company) voltage in our home (220 volts), we will know that maximum voltage that we can endure (without using proper insulation, such as sandals, or shoes)is much lower than PLN’s voltage. Means that PLN’s voltage is able to kill us if we connect ourselves directly to the ground.

so, the lessons from this post are :

BE CAREFUL WHEN WE USE ELECTRICAL DEVICE OR ELECTRICAL NETWORK, BECAUSE THE PLN’S VOLTAGE ACROSS OUR HOME ARE ABLE TO KILL US.

USE ENOUGH INSULATION PROPERTIES IF WE WANT TO REPAIR AN ELECTRICAL DEVICE, SUCH AS SANDALS OR SHOES. IT WILL NOT GUARANTEE YOU 100% SAFETY, BUT IT WILL HELP YOU DECREASE YOUR CHANCE TO BECOME ELECTROCUTED.

Stand n Fight!!!

wahidyankf

this is another side of electrical student.. well, no many of us being attracted with financial market.. no wonder why, as our major is electrical.. here is my story of being a trader, focusly in foreign exchange, commodities, and futures.. i’ve been doing this since our first year in itb.. lately we focus our discuss on forex.. please note we are not discuss any legitimate issue (halal-haram), you better search by yourself..

forex stand for foreign exchange a.k.a valuta asing a.k.a jual beli mata uang.. the same as stocks (saham) unless the object we trade is currency.. say we bought US$ today for Rp 9.000, then next week $ strengthen to Rp 12.000, means we gain profit Rp 3.000 for each $ we bought.. that’s it..

mostly lay people consider financial market as limited as stocks and forex.. besides, the financial markets can be divided into different types, as example:

• capital market (stock *saham* and bond *surat berharga*)
• commodity market (gold, oil)
• foreign exchange market (currency)
• derrivatives market (options, futures *frequently seen on newspaper ads*)
• etc.

forex is related to scam ? ya that’s true, you invest your money here, you will lose it, either by your stupid decision buying wrong currency while it’s value is going weaker, or you are being fooled by such investment program which offer you high return if you invest there.. in fact, only 5-10 % of trader could gain money, others are loser.. most of them lose their money in this bussiness, thats why forex is related to scam..

ok, i realize the risk and i want to invest there, then how do we got access to realtime prices and trade them ?

the first thing you should find is a trustable broker, broker give you access to the market, you will able to trade financial market with them.. there are many of them, both local and international.. i personally prefer the international one, because local regulation regulated by bappebti (badan pengawas perdagangan berjangka komoditi) and others is not tight enough.. those weak regulation give bigger opportunity for local broker to fool investor, they easily stole our money.. well, no one in this world guarantee our money even i put my money on tighter regulated country such as europe or US, at least i feel more secure.. do you know that every investment we did have a risk ?, even putting our money in the bank ? FYI, our government guarantee our money as much as Rp 100 million, say you have Rp 1 billion on your bank account, then your bank is collapse/bankrupt, it means you will lose Rp 900 million.. don’t worry, just few days ago our government has increase the guarantee to Rp 2 billion, unless you have more than 2 billion, you should worry then LOL..

back to the broker, many criteria we should consider to find the good one.. the point is, find one you trust with..

example for the local, even you can find some of them on dago street :

.

.

.

example for international :

.

.

after finding your broker, you should gain your trading experience with them.. don’t worry, you no need to invest your real money in rush.. most broker offer us demo account which give you real environment, realtime market prices, and virtual money instead of your real money..

ok good,  you are able to trade now, with your dummy money of course.. then how to analyse the currency/stock/etc. movement ? how do we predict that $$ will go higher ? where the oil price is heading ? stocks will up or down ?

there are two types of analysis :

• fundamental analysis ( we are considering economic, politic, important policy issues.. yes, you have to be update: read newspaper, watch bloomberg-tv, read any news.. I recommend http://www.bloomberg.com to find the news)

.

• technical analysis ( read the chart, you can predict the price movement easily here, there are soooooo much technics to read the chart, many ways to interpret the chart, for beginner I recommend http://www.babypips.com/school/ )

.

.

done, you have all. you are able to trade now =)

here is the example of my real trade with real money i invest:

this is Great Britain Poundsterling vs Japanesse Yen chart.. now price is @ point C, and i predict price will fall to point TP1 & TP2.. the fallin price means poundsterling weaken and yen strengthen.. a week after, price is fallin as predicted =)

it shows us how i predict the currency movement by technical analysis, you may see those freakin lines, sure those means something haha..

there are many things you should learn distinct written here, such as risk managment (how you manage your risk), money management (how much you put your money into trade), many more..

.

now:

.

a week after:

.

.

Herry Winandi

Power Engineering – 2005

Bandung Institute of Technology

]]> http://basementbrat.wordpress.com/2008/11/01/23/feed/ 18 herry winandi logo1 logo_valbury gab logo-fxcm map bloomberg babypips h41018x666ls6ag7 h1803x476yj0 copy-of-imag0010 http://basementbrat.wordpress.com/2008/10/30/heat-generator/ http://basementbrat.wordpress.com/2008/10/30/heat-generator/#comments Thu, 30 Oct 2008 23:41:51 +0000 rachma001 http://basementbrat.wordpress.com/?p=18 ]]>

Okay, so here it goes, another story of my life, but from the engineering and scientific point of view. (This is the first post about it).  Just a week ago, my lab mates showed me one of my lab’s creations which I cannot upload the photo (I don’t have any permission to upload photos, but u can check it in my facebook). This device is an experiment for power generator by using heat energy or we usually call it ‘thermal’.

This is how it works : You can see the device which look like a circular windmill. If you see it more closely, then you would find the tiny magnetic dices on the outer parts of the circular windmill’s periphery. And there are also some magnetic dices that are stacked below the windmill. These magnetic dices’ colour is gold, and the magnetic dices around the windmill periphery’s colour is black. The gold magnetic dices are stacked (statically) as well as possible so that if the windmill starts rolling, the black ones and the gold one will have a really tiny space between them, that normally will evoke the magnetic force between them.

Okay, but in this device, you should put the device in hot water. The hotter the water is, the better result you’ll get. But you just soak it until the height of the water reaches 3/4 of the gold dices’ height. The heat from the water then will make the gold dices lose their magnetic charateristic, weakening their magnetic force, meanwhle the black dices still have their magnetism, so then if you imagine how the magnetic lines would be, you’d find that all the magnetic forces between them, will make the windmill start rolling.

They plan for this device to be applied as the generator in the industries, so that the heat it needs will be taken from the heat that the industries produced. So that it’ll make such a cycle of the heat.

I don’t know if you already know about it or not, but that’s the only news about tech that I’ve got here. So hopefully it informs you something.

And I am not really a critical type of person, so please if you have any question about it or about anything related to the Japan’s technology, just ask me, let me do the favor for you. Because I really want to share everything I got here, but often I don’t know what to share..

]]> http://basementbrat.wordpress.com/2008/10/30/heat-generator/feed/ 16 rachma 08-10-15_0022 08-10-15_0031 08-10-15_0041 http://basementbrat.wordpress.com/2008/10/30/genesis/ http://basementbrat.wordpress.com/2008/10/30/genesis/#comments Thu, 30 Oct 2008 03:07:03 +0000 Fela Rizki Wardana http://basementbrat.wordpress.com/?p=5 ]]>

As with any other creation in this world, we now define the origin of this weblog page,
Genesis (in Indonesian it means “Penciptaan; Awal mula”)

We are the basementbrat of Labtek 8, Electrical Engineering Undergraduate Students, Bandung Institute of Technology.
At first the idea of putting and sharing our thoughts on this page was triggered by the spirit of the Indonesian Youth’s Pledge (Sumpah Pemuda) at October 28th. We wanted to make contributions to our nation distinctively within our field of specialty, which is in the field of engineering especially electrical engineering. We realized that technology would mean nothing if not shared to the community. We also realize that ideas, thoughts, sometimes the crazier the better, are the gateway to better Indonesia.

We often see that those brilliant ideas are taken for granted and put in vain, it was all because lack of documentation, imagine if all those ideas are put together, and hopefully be put to reality. This page is meant solely to facilitate (and also stimulate) those who has the passion of writing zestfully.

We are thrived and committed to giving the best pieces of writing available, by means of The Basementbrat Crew’s Pledge:

1. Content
We deliver in depth contents, rich and comprehensive analysis about topics ranging from almost every known aspect in our lives .

2. Universality
We do not differ men nor women, social strata, interests, regional origins, etc. While upholding the spirit of democracy and avoiding any conflicts regarding those terms above as possible.

3. Accuracy
We uphold the truth. By means of engineering code of ethics, all topics written on this page are expected to be fair, honest, and truthful.

4. Open-mindedness and Flexibility
We are open to any honest thoughts. Especially ideas, dreams that will lead for the better future of Indonesia. We do not define our limits, any imagination, or such else that will enchain our creativity.

5. Motto
From dreams, we make it real, for our beloved nation, Indonesia

The rules regarding of those terms mentioned on the pledge above are:
1. All posts are to be written in English
2. All posts must be put in an orderly categorized manner
3. All comments are welcome and must also be written in English
4. All crews are expected to write at least one topic for each month
5. All Electrical Engineering students of ITB are welcome to contribute
6. All people who shares the same enthusiasm are welcomed as good friends of ours

Best Regards,
BasementBrat Crew’s Board of Administrator