Thursday, January 17, 2008
Technology in Tennis: Hawk-eye
(Hawk-Eye is a computer system used in cricket, tennis and other sports to track the path of the ball. It was developed by engineers at Roke Manor Research Limited in 2001; the patent being held by Paul Hawkins and David Sherry[1]. Later, the technology was spun off into a separate company, Hawk-Eye Innovations Ltd., as a joint venture with television production company Sunset + Vine.)
I found this from one of the blog sites (http://jtsang.blogspot.com/2006/07/technology-in-tennis-hawk-eye.html) and hope you guys would like this.
With the advent of technology, its integration into sports has come at an astonishing pace. We have seen technology used to aid in sports training (heart rate monitors, wattmeters, training programs etc), improve the field of play (artificial playing surfaces, covered/indoor stadiums, etc), enhance sporting equipment (tennis racquets, synthetic material for basketballs, hockey sticks, etc) and expand media coverage (newspaper, radio, television, internet etc).
One other area where technology has played a large role is that of officiating. Different sports have embraced technology at various levels. This difference can be seen between sports like baseball or soccer, where there is minimal technology used to aid in officiating, to sports like football and hockey, where video replay can be used to aid officials.
Over the last few years, tennis has been one of the sports that faced pressure from the public to adopt technological aid to assist in line calling. This pressure has been growing as a result of the increasing speed in the game, along with the increasing number of controversial line calls by officials. Perhaps the breaking point in this came in the form of the 2004 women's U.S. Open quarterfinals match between Serena Williams and Jennifer Capriati. In the third set of that match, there was an incorrect chair reversal of a call made by the linesperson which eventually cost Williams the match against Capriati. The mistake was acknowledged when the tournament's head of officiating removed that official from further matches and personally called Serena Williams to apologize for the bad call.
In March of 2006, tennis introduced technological aid in officiating in the form of instant replay technology at the Nasdaq-100 Open in Miami. Following the great feedback from players and fans, the use of electronic line calling will be expanded to include Sony Ericsson WTA Tour and ATP events participating in the U.S. Open Series. This will culminate in the debut of electronic line calling at the U.S. Open, a first for a Grand Slam event.
How does Hawk-eye work?
Hawk-eye uses multiple cameras placed around the court to track the players and the ball. These movements are then processed by computers. Hawk-eye takes ball skid and ball compression into account and is accurate to 2-3 mm.
A visual description of the Hawk-eye system (number of cameras may vary depending on setup)
It is important to note that Hawk-eye isn't entirely new; however, it has been refined over the years to such a degree that the confidence level in the system is high enough for use as an officiating aid.
The use of this tracking technology also allows for a new range of statistics to be captured and presented to the viewing audience; something that many tennis viewers may already be familiar with. In addition to calling lines, statistics that Hawk-eye can measure include speed of the ball at any point of a rally, service comparisons (i.e. service patterns, direction and depth of aces, placement of 1st and 2nd serves etc), bounce points of the ball, percentage of time a player spends in a region of the court or an approximate measure of distance that a player has run throughout the match.
Statistics from the 2005 Wimbledon Final between Roger Federer and Andy Roddick. We can see Federer targeting the Roddick backhand side on second serves. Also note the placement of Federer's aces on Roddick.
As part of this system, new video boards will be a large part of the in-stadium atmosphere on centre court for instant replay coverage, statistics, fan interaction, contests and corporate partner recognition. You may even see players sneak a peak at their stats during changeovers, in order to make in-game adjustments. The television broadcast is also enhanced by this system, primarily through the usage of the various camera vantage points around the court, and the display of statistics during the course of the match.
With all this technology in place, there is always an associated cost. The system costs approximately $20,000 to $25,000 USD for a court per week (excluding the video screens in the stadium). As a result, in Toronto's Rexall Centre and Montreal's Uniprix Stadium, this system will only be set up on the main court. Advertising opportunities will help to defray these costs, as partners can associate themselves with this technology (think of the Hawk-eye brought to you by "..." or these Stats are brought to you by "...").
Changes to the game
At all U.S. Open Series tournaments, the on-court instant replay system can be used by the players in the form of a challenge system. The challenge system will work in the following manner:
* Each player will receive two challenges per set to review line calls.
* If the player is correct with a challenge, then the player retains the same number of challenges.
* If the player is incorrect with a challenge, then one of his/her challenges is lost.
* During a tie-break game in any set, each player will receive one additional challenge.
* Challenges may not be carried over from one set to another.
Once a player challenges a line call, an official replay will be provided simultaneously to the television broadcast and in-stadium video boards, allowing players, officials, on-site fans and television viewers the opportunity to see the live results of a player challenge.
This serve is out
Reaction to this system
Most players have embraced this system. Perhaps the most notable exception is Roger Federer. "What is happening is madness," Federer said of the decision to use the Hawk-Eye computer system on the main court for the Nasdaq-100 Open. "A pure waste of money." Perhaps with time and/or further refinement of the system, he will come around.
Here are reactions from other players and broadcasters.
Andre Agassi - tennis player
In my 20 years in professional tennis, this is one of the most exciting things to happen for players, fans and television viewers. This new technology will add a whole new dimension to the game.
James Blake - tennis player
The ball's moving so fast these days that sometimes it's impossible for anyone to see, even a trained official. With instant replay we can take advantage of technology and eliminate human error. Having just a few challenges will make it both fun and dramatic for fans at the same time.
Jamea Jackson - tennis player (first to make a challenge)
It takes a lot of pressure off. You don't get so angry. If you think a call is incorrect, you don't spend extra games thinking about it. It's really quick. I remember people were complaining about maybe it throwing off the timing and rhythm of the match, but it didn't do anything like that at all.
John McEnroe - former tennis player, current broadcaster
If anyone's been listening to my commentary the past year then they know I'm in favour of using replay. I think it will make tennis more interesting.
Cliff Drysdale - former tennis player, current broadcaster
I'm thrilled about it because tennis needs it for a variety of reasons, one of which, the main one being the viewing public, the second being the live audience and thirdly just because we don't need more repetitions of what we've seen over the past year with people getting hooked out of matches.
Wednesday, October 10, 2007
Home owning vs. renting
Ruthven claims renting can be more economical than buying, if the monetary difference between renting and buying is invested in quality shares or super. Ruthven also says that interest payments on a house are higher than rent even before capital/principal repayments are made. At the moment, interest rates are actually double rent rates! There are many forgotten costs involved in owning a house For example: a) transfer costs (real estate agent fees, conveyancing fees and stamp duty) three or four times over 30 years, given that people own homes on average for around 7-8 years before exchanging them: Other factors to consider Full Report: Phil Ruthven, Chairman 1. The average Australian will live in at least ten (10) homes during his or her life, seven of these independent of parents and mostly as a married person. Of the seven homes, how many should be owned, if any, versus leased? 2. Leasing is different to renting in a number of ways: 3. Home ownership has varied between 45% and 75% over the past 130 years (currently 69%). It would be unlikely to ever exceed 75% due to: 4. Some European nations have very low home ownership, and therefore high propensities for leasing, as can be seen in the exhibit below.
6. All the above, plus a longish period of inflation, meant that home ownership made good financial sense via cheap or even "free" money (after deducting inflation) and being a hedge against inflation. 7. It is important to remember that home affordability should always be weighed up against alternative investment opportunities. 8. During the last 45-50 years, home ownership became a motherhood issue and came to be treated as a normal thing to do (which it wasn't historically) and a source of emotional security and stability. These latter attitudes will continue on for decades. Further, most parents believed it to be a form of forced savings, which it was. 9. Over this period, the saying developed that "rent was money down the drain". This was not true, since for most of this time the interest payments on a house were higher than rent even before capital/principal repayments were made. In 2007, interest rates are actually double rent rates! My own apartment is a good example: the lease is around $28,000 per annum. The interest alone, if I was buying the apartment (around $925,000) would be around $74,000, before any capital repayments. So, it is "interest payments that are money down the drain". And clearly one can make a far better return on the amounts of money used as capital repayments on a house loan (eg. by investing in shares). Of course, inflation means that capital repayments become easier over time as wages and salaries grow, and principal repayments remain constant. 10. Leasing is recommended for length of tenure and security reasons (i.e 3+2 years, 5+5 years), not renting. Such leases are not easy to find but will become more prevalent as we move through the 21st Century. For decades in the USA and Canada, whole suburbs have been built for leasing only! And leasing has been common in many European countries for over a century. These trends are now only starting in Australia. Leasing of homes will mainly be provided by institutions (property trusts, pension funds, etc), whereas renting of homes is provided mainly by individual owners of homes. 11. If, individuals or families leased their home and invested the difference between the lease costs and the interest-plus-principle repayments in shares, then: The real questions are: 12. In investing the difference in good blue-chip shares it is well to remember that, from time to time, the sharemarket falls (even crashes), but always recovers in the long run.
13. Now let's look at some examples. One option is to buy (with 10% deposit) or lease an established house worth $475,000 in the year 2007. Assume inflation will average 4% over a 15 year pay-off period , and interest rates will average 9%, bearing in mind the cyclically low rates of inflation and interest rates in the 2001-06 period that are unlikely to continue over the next 15 year period. a) Buying @ $47,680 per annum fixed over 15 years The value of the home in 2022 (15 years hence) would probably be around $1,230,000 and that is what another home the same size and type of location would cost in 2022 as well. In 2022, the home owner has an investment of $1,230,000 and a nominal capital gain after costs of $468,500. But this doesn't include hidden expenditure of some $427,500 as explained in Point 15 later, suggesting a net profit of just $41,000! Not much, so buying a home is a case of forced savings not a good investment b) Leasing @$21,375 pa initially, rising each year, and investing the difference in shares, assuming an average cumulative gain (capital gain and reinvested dividends) on the growing portfolio of 14.3%5 14. In the above example, buying a $475,000 home with a $40,000 deposit should result in a fully-owned home worth $1,230,000 at the end of 15 years. If the home was leased, then investing the difference should result in an investment worth $2,437,290 at the end of 15 years. At the end of 15 years the lessee could pay cash for a $1,230,000 home and still have $1,207,290 in the bank (or, preferably, superfund)! If you then start with this $1,207,290 for the next round of 15 years (now owning a home outright with no lease payments), then at the end of another 15 years - that is, 30 years from now - you have a home worth $3.2 million and investments worth $6.6 million (after superfund tax) without putting any extra savings in each year! You could retire in luxury with this fortune. The above conclusions would not vary if a more thorough/vigorous exercise was carried out. On the one hand, the assumptions about the earnings rate on investments (difference between leasing and owning) may be too optimistic, but calculations on ownership costs are understated, as elaborated in Point 15 below. 15. The "forgotten" or "hidden" costs of home ownership include: These are massive over each 15 years for home ownership. Let us start with maintenance. With home ownership, we do not put a dollar value on our DIY time . But the cost of "maintenance" on the basis of average household income per hour worked in the workplace is $23,000 per year (based on ABS statistics on hours of household maintenance work) plus materials. Over 30 years, this alone is (in today's value terms) around $690,000. In this calculation, I have only included 70-75% of the "maintenance" hours, assuming some of the maintenance could be regarded as hobbies or therapy - or would still need to be done as part of a lease of a dwelling (preferably outsourced for lower costs ). Not to forget the average $120,000 in additions/alterations paid to builders. The other costs are also significant: transfer costs (four times in 30 years) would be around $110,000 (today's prices); rates and insurance (except contents) add another $55,000 over the 30 year period. These are in today's money terms. So, around $427,500 costs of owning homes over each 15 year period are involved in "hidden" items in the form of maintenance, alterations and additions, transfer costs, rates, insurance etc. 16. Owning a home as the main basis of retirement is well short of reality. Let us look at a case-study retirement. Assume:
17. So, the case study retiree requires:
In brief, a dignified retirement with own home, no debt and a third of the prevailing average household income each year until death suggests assets of: The Australian average is on track for half to two-thirds of these amounts at best! Singaporeans are on track for double (or more) of the above assets at retirement due to much, much higher annual savings (36% of income c.f 9% for Australians) during their working life. Minimum savings levels for one's entire working life is 15% gross annual income to have a dignified, self-sufficient retirement. A guide to comparative returns in the recent past and near future is shown below. Over the longer term, shares always win. 17. If individuals or couples ought not to own homes, who should or will own dwellings and why? In essence, the same institutions that now own office blocks, shopping centres, factories, warehouses, hotels, tollways and other infrastructure are beginning to own residential dwellings, i.e: property trusts, pension funds, life offices, etc in which the public invest. Why would they own them? The main reasons are that:
18. So what to do? 19. Terrified of selecting shares on the Stockmarket? Don't try to pick winners. The returns quoted in Points 13 and 16 are using indexed results. All you have to do is ask your stockbroker to buy shares that match the index (preferably All Industrials Index in Australia which matches the Dow Jones) and International Shares. Then sleep nights without worrying. And don't worry with occasional sharemarket falls (or crashes); dividends are usually still paid, and the value of the (indexed) shares always recovers and goes higher. 20. But isn't the home free of capital gains tax and shares are not? Yes, but:
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Thursday, October 4, 2007
My Pet, Bull
Boozing like pig..
Again met him near “Niromi” DANSELA..
On a fullmoon wesak day…
Eating like a pig..
Very soon he became intimate with me..
Then I realised…I’m wrong…
He is not a pig….he is a bull…
He was always around me. at work. after work. Weekends…where ever I go…
Then I decided to leave this animal …
And came to Melbourne….
Bad deeds in life, you can not avoid..
Come after you like a wheel of a bullock cart coming behind a bull.
Worst part in my life..
I ended up living in cattle shed with the bull…
I did not have any options in my life
Started treating it as my pet…BULL
Monday, October 1, 2007
Sunday, September 30, 2007
My Doggy - Part - I
I'd come to town to have a drink, I'd just received my pay.
The Orchid bar was quite deserted, just this other fella and me,
And I reckoned by the way he looked he needed company.
I introduced myself to him and bought a round of white,
He looked at me said,"Your welcome dude."
The legend which started from that day still continues
Even though attacks from many paws
Friday, September 28, 2007
Mo Quit Drinking
The bartender asks him, "You know, beer goes flat after I fill it in the glass; it would taste better if you buy one at a time." The man replies, "Well, you see, I have two freinds in Sri Lanka while I 'm in Melbourne.
When I left Sri Lanka, we promised that we'll drink this way to remember the days when we drank together. The bartender admits that this is a nice custom and leaves it there. Mo became a regular in the bar, and always drinks the same way.
He order 3-Beers and drinks them in turn. One day, he came in and ordered only 2-Beers All the other regulars notice and fall silent. When he comes back to the bar for the second round, the bartender says," I don't want to intrude on your grief, but I wanted to offer my sincere condolences on your great loss. " Mo looked confused for a moment, then he laughs ....
"Oh, no," he, said,
"Everyone's fine - both my friends are alive" .
" The only thing is I just quit drinking!!!
Thursday, September 27, 2007
Trade Forex
Small idea for you guys....Start trading on foreign exchange. There are lot of on line sites available now for this. I recommend you to go to www.oanda.com this is a US based company registered with Securities Exchange Commission in US, and with a good asset base and stable company. You can try trading some currencies. They have game accounts too.. that’s 100% free. First you can give a try. Actually I also tired once. And still I have an account opened with them. I did not do it very regularly and was never in constant touch with the market and could not do much there. But if you can spare few minutes per hour you can make some good profit. They allow you to gear up to 98% that means if you deposit 1000USD you can purchase currency up to 98,000USD. But be don’t gear up to that level, You may go up to 80% and have a cushion to absorb market fluctuations , if not you will loose every thing...
One more idea, guys who do not have time for trading, invest some money in a managed portfolio, you may start with $1000 or more and keep contributing some thing monthly, if you select a high yielding portfolio (You have the risk), though you don’t make money like trading, after some time you will have some wealth created for your self, definitely better than save in a bank (don’t forget the risk factor)…





