Monthly Archives: July 2009

Successful dress rehearsal,”Avalon focus project.

At the World Robotic Sailing Championship on the Portuguese coast, the ETH team achieved third place with its boat “Avalon”. The Championship was also a test for the major Atlantic crossing planned for September.

Avalon had to prove itself on the high seas for the first time at the World Robotic Sailing Championship on the coast of Portugal. Apart from a few minor technicalities, everything went swimmingly (Image: SSA/ETH Zürich)

You can see the relief on the faces of students Gion-Andri Büsser and Hendrik Erckens. The hard work of the last few months has paid off. At the World Robotic Sailing Championship (http://paginas.fe.up.pt/~jca/wrsc/) in Portugal, the sailing robot “Avalon”, which they developed as part of the focus project, was beaten by just two boats: the Austrian “Roboat” and the Portuguese “FASt”. This was merely down to “minor hitches with the software”.

Otherwise, the two project leaders for the “Student Sailing Automation” group (SSA, http://www.ssa.ethz.ch) are certain that their unmanned sailing boat would have been right at the front of the pack. At four metres long and with a top speed of six knots, it is not only the largest boat in the robotic sailing competition but also the fastest.

The race took place from 6 to 12 July in Portugal, and was not just a quest to crown the world champion. For those boats registered for the International Microtransat Challenge (http://www.microtransat.org/?lang=de) in the autumn, it was also one last major test of resilience: are the boats really technically able to accomplish an Atlantic crossing?

However, the World Championship was a walk in the park compared to the challenge ahead: the longest straight was never more than 300 metres, whereas the competition in the autumn will be over more than 7000 kilometres. The four races on the Portuguese coast still showed the teams where they have to improve and how good the boats sailed in comparison to the competitors.

First test at sea

“The Championship was very helpful and we have learned a lot”, says Gion-Andri Büsser. Not least because the race in Portugal was the first time that the ETH sailing boat had been at sea. Prior to this, the students had only been able to test the boat in lake waters.

The competition showed that Avalon was able to hold a course without any problems on straights, even in very strong winds, but that turning manoeuvres occasionally caused a short loss of orientation. The developers therefore had to switch to remote control every now and again in order to steer the robotic sailing boat to the next buoy. This is not allowed in the competition and led to several point deductions, eventually costing the ETH team the title.

The mechanical engineering students took all of this in their stride, however: “After all, the Austrian team has been working on the software for three years, whereas our group has only had three months”, says Hendrik Erckens. Also, the remote control only had to be used for two seconds to bring Avalon back on course. The SSA group is therefore certain that they will have their software under control by the autumn. Testing will include trials in the Mediterranean. Avalon will be sailing continuous routes of up to 200 nautical miles, from points on the French coast.

The project leaders also claim that the transfer of power from the motor to the sail has not yet been perfected. The transmission needs to be made more robust. However, this is also a minor problem, especially as all other components work without any problems, thanks to generous financial and technical support from active industry representatives. One example of this is a boom constructed especially for Avalon. This is made of carbon fibre and the pivot is not on the mast, as is usually the case with manned vessels, but further back, lowering the energy use. After all, the power supply has to last for two to four months. This is how long organisers are estimating that the transatlantic regatta will take.

Sufficient energy reserves

The eight young engineers have made sure that Avalon will not run out of juice in the middle of the journey by covering the whole deck with solar cells, with a reserve energy source provided by a 28-litre methanol fuel cell on board. “We have calculated that this fuel cell alone could power Avalon for a month.” A continuous power supply is therefore guaranteed.

Gion-Andri Büsser says that there are, however, less predictable risks such as storms that Avalon cannot avoid, or smaller ships on its course. Whilst larger boats transmit positioning data, allowing Avalon to calculate a different route, the ETH sailing boat is relying on smaller ships without this signal to make way.

If you talked to Avalon’s creators, you would think you were listening not only to experienced mechanical engineers but also to hardened worldwide sailors: they talk just as freely about the construction of the individual boat components as they do about the trade wind systems. However, although all of the team members have a little sailing experience, most of the knowledge had to be learned, as Hendrik Erckens admits: “In the beginning, everything was new to us, but the transatlantic competition was a huge motivation.” The eight students therefore asked friends and experts for advice and secured industry sponsors, who now fully finance the ambitious project.

This kind of commitment is exactly what focus projects at ETH need. A product has to be realised from the initial idea through to the final product within a team of students, applying and building on theoretical knowledge gained in their lectures.

World record in sights

“It’s fantastic when you see what this project has become”, reflects Gion-Andri Büsser. Even if it’s a lot more work than just going to lectures. Now all they have to do is cross the Atlantic. This is the ultimate goal – together with a world record. When the robot sailing boats set course for the Caribbean from the Irish coast in the autumn, they will also be heading for an entry in the Guinness Book of Records: never before has an automated sailing boat managed to cross the Atlantic.

Everyone can follow the progress of the eight pioneers’ endeavour, including the Avalon’s route through the waves of the Atlantic, from this autumn using Google Earth and the SSA website. Wish them luck!

Dart game rule, Cricket.

   크리켓은 가장 보편화된 다트 게임입니다.

그래서, pub이나 게임 룸의 다드보드옆에 걸려있는 스코어보드(score board)가 이 게임을
할 수 있는 보드라고 할 수 있습니다.

또한, 영국에서는 미키마우스(Mickey Mouse)라고도 불리어지며, 영국의 체스(Chase) 게임과 매우 유사합니다.

http://www.candystand.com/play/darts

두명이난 두팀이 할수 있는 게임입니다.

사용하는 영역(area)는 20,19,18,17,16,15, 불(bull`s-eye)만을 사용합니다.
20부터 15까지 숫자와 불(bull)에 다트가 3개이상씩 누가 먼저 넣는가를 겨루는
게임입니다. 3다트가 되면 클로즈(close)되었다고 말합니다.

똑같은 영역에서 상대방이 클로즈 되기 전까지 3다트를 초과한 다트는 득점으로 인정합니다.

단, 상대선수도 그 영역에서 클로즈 된 상태라면 초과된 다트도 득점으로 인정되지 않습니다.

예를 들면, A라는 선수가 20점 영역에 1드로우(throw)하여 1다트가 20점 영역에,
2다트가 20점 트리플링에 들어가고, 3다트가 20점이 아닌 다른 영역에 들어갔다면, 어떻게 될까요..
B라는 선수의 20점영역의 상태에 따라 다릅니다. B라는 선수가 이미 20점 영역을 클로즈한 상태라면
A선수의 20점 영역 클로즈하기 위한 3개를 뺀 1개 초과분이 있다할지라도 득점으로 인정되지 않습니다.
하지만, A선수가 아직 20점 영역을 클로저 한 상태가 아니라면, B는 다트 1개 초과분인 20점이 득점으로 인정됩니다.
20부터 15와 불(bull)까지 순서는 관계없습니다. 각 영역이 모두 클로즈 되었을때 점수를 비교하여 고득점이 승자입니다.

그렇다면, 여러분은 상상하실수 있겠죠?

상대선수보다 적은 득점의 상황이라면 상대선수가 아직 클로즈되지 않은 영역을 집중공격하여 점수를 앞질러 가야겠죠?

이와 같이 크리켓 게임은 공격과 수비의 개념이 들어간 다트게임입니다.

스위스비자 준비

스위스는 관광일 경우 무비자 입국 90일 가능하지만,

학생비자를 받으려면 입국 하시기 전에 스위스 입국 비자를 받으셔야 합니다.

유학을 원하신다면 우선, 해당 학교에서 입학 허가서를 받은 후

대사관에서 원하는 몇가지 서류를 첨부하여, 먼저 인터뷰를 하셔야 합니다.

* 스위스 입국 비자 신청시 제출 서류

1. 비자 신청서 3부

2. 최종학력 졸업, 성적 증명서(영문1통씩)

3. 통장 잔고 증명 ( 학비와 생활비를 충당할만한 충분한 자금이 있어야 합니다.)

4. 재정 보증인이 본인이 아닐경우에는 직계가족 중 한분이 재정 보증인이 되어야 하며,

그 재정보증인이 가족이라는 증명( 주민등록등본 및 호적등본)을 제출하셔야 합니다.

5. 진학 하고자 하는 학교의 입학 허가서

6. 학업 계획서 (스위스 학교를 선택한 이유, 계획, 졸업후 진로방향등을 기술하시면 됩니다)

7. 귀국 서약서 (학업을 마친후 한국에 돌아오겠다는 서약서를 작성하시면 됩니다.)

이러한 서류를 준비하여, 주한 스위스 대사관에 전화를 걸어, 인터뷰를 예약합니다.

인터뷰를 마치고, 서류를 제출하고 6주 후면 대사관에서 여권을 제출하라고 합니다.

그럼 여권 제출하면, 그 다음날 입국 비자 스티커를 붙여 돌려주게 됩니다.

그럼 스티커 붙인 여권들고 뱅기 타면 되요~

더 궁금한거 있으심 쪽지 날리세요~ 성의껏 답해 드리리다