Archive for the ‘research’ tag
Berminat belajar Quantum Communications?
Hari ini baru selese kuliah Quantum Communication, yang ngajar orang ini.
Busyet dah… Pening… banyak konsep baru…
Quantum Communications adalah sebuah teknologi komunikasi yang mengambil prinsip Quantum untuk mengirimkan informasi. Saat ini, yang digunakan untuk mengirimkan data adalah photon. Media yang dipakai dapat berupa udara, atau fiber optic. note: photon berbeda dengan light loh yaa…
Quantum Communications adalah emerging technology pada abad 21. Yang namanya emerging berarti masih dalam tahap research, belum dipake orang banyak. Kalo sebuah teknologi udah bisa dibeli di supermarket, atau pasar inpres, artinya teknologi tersebut udah well established. Research tentang quantum communications banyak dilakukan di universitas eropa (vienna), US, dan tentu saja Australia. Perkiraan sih mungkin perlu 5-10 tahun lagi sampe teknologi ini bisa sampe dalam taraf komersial.
Quantum comms dipilih karena mempunyai feature yang sama sekali beda dengan classic communications. contoh: cryptography, super-densed coding, quantum network, quantum switching, quantum computers, dll. Salah satu feature yang menjadi daya tariknya adalah quantum cryptography dimana lebih baik dari cryptografi klasik saat ini. FYI, kriptografi classic yang dipakai saat ini dapat dibreak dengan menggunakan quantum computers.
Untuk dapat memahami quantum comms, ada hal dasar yang perlu diketahui dan ini sangat berbeda dengan komunikasi klasik. misal: qubit, quantum entanglement, bell states, measurements, no cloning theoy, quantum teleportation, dll
Beberapa achievement dari quantum comms adalah quantum comms pada jarak lebih dari 150km (journal nature, 2007), dan quantum entanglement di luar angkasa (saya lupa sumbernya).
Jika teknologi ini udah established, tentu saja kita2 ini bisa jadi quantum engineer. horeeee… sabar ajah dan terus belajar… hehehe… 🙂
Ini ada cerita tentang dari PhD student yang baru selese menyelesaikan thesis tentang quantum comm. ada info tentang sholarship juga loh… 🙂 silahkan klik disini.
understanding: confidence interval, confidence level and number of sample
Just want to share about an idea of understanding confidence interval, confidence level, and number of sample without being bothered by the formulas. I found many people are still confused about this.
here it is…
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Shooting analogy
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Statistics in research
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Goal: to shoot a circle target in a given distance
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Goal: estimate mean of population in the form of an interval.
Why interval? Because you don’t do a census. Therefore, the best thing that you can do is providing an interval, and hoping that the mean of population is in the interval |
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jury will mark your shoot
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audience will comment on your research
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Your gun: best sniper rifle
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Your tool: doing sampling |
| Assume: environment is ideal: wind, rifle, bullets |
Assume: sampling process is ideal
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Size of target: measured by diameter
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Mean of population: defined by interval. This is the confidence interval
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you’ll feel more confident if the target is wider.
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in here, the higher the confidence level, the wider the interval will be. Because if you provide a wider interval, the higher probability of population’s mean appear in the interval. That’s why you feel more confident
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unfortunately, the jury won’t allow you to widen the target size
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the audience won’t like a wider estimation interval. They’ll think that your research is not accurate.
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so, the target size is fixed, and so your confidence level.
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here, you have to stick with your confidence level (let say 95%). You don’t want to be ashamed right?. You need to find out, how to shorten the estimation interval without decreasing confidence level.
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one way to make sure that you can hit the target is by shooting more
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here, you can produce a better result by increasing the number of sample because the more data the closer to the reality. Then, your audience will trust you more.
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So, if you meet a beginner in statistics, this analogy could be of some help.
Achmad Mardiansyah
tips: online research with zotero
i just want to share some tips about online research & managing bibliography.
Online research is a very popular way of finding information. The traditional way of managing those resources is by saving the pages manually. Unfortunately, the drawbacks is difficult to manage the bibliographical information. URL, author, accessed date, title, of the web page are not saved when the page is stored in our local storage.
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