2008年5月28日 星期三
GPS in Hong Kong
Recently, I had a chat with friends and professionals about GPS in Hong Kong. In recent years, there are two breakthroughs in GPS chips, one is the sensitivity has been improved much meaning signal reception have been improved in poor signal area. In other words, for areas that cannot recieve signal in the past, you can get position now. Second breakthrough is the cool start up time. We have Quick Fix II now, depending on the environment, it could provide fix within 4 seconds now. In the past, you need to wait for 20 to 60 seconds.
However, the final problem is building canyon, which I can see it could be fixed in while nobody will make it as a product in coming five years. This is the major problem of applying GPS in Hong Kong. Technically, it is due to a phenomenon called multiple path. Solving multiple path problem could be a good topic in the university. I guess, there is no simple answer. Even if there is answer, it will be very costly. This also means the very unique GPS problem in Hong Kong cannot be solved in short time. GPS applications including tracking or car navigation system could not become population in coming future.
However, if there is auxillary position system could be developed, then we don't need to wait researchers to solve the multi-path problem.
However, the final problem is building canyon, which I can see it could be fixed in while nobody will make it as a product in coming five years. This is the major problem of applying GPS in Hong Kong. Technically, it is due to a phenomenon called multiple path. Solving multiple path problem could be a good topic in the university. I guess, there is no simple answer. Even if there is answer, it will be very costly. This also means the very unique GPS problem in Hong Kong cannot be solved in short time. GPS applications including tracking or car navigation system could not become population in coming future.
However, if there is auxillary position system could be developed, then we don't need to wait researchers to solve the multi-path problem.
2008年5月19日 星期一
2008年5月17日 星期六
特拉維夫的Hall of Independence
2008年5月16日 星期五
以色列式野餐
以色列的海岸線很長。沿著海岸都是沙灘。沙灘面對著的是地中海。這天是星期四,對以色列人來說是一個星期裏最後的工作天。上帝用六天創造世界,星期六完成創作。以色列人將星期五六作為休息日,星期天才是一個星期的開始。
星期四,我們被邀請參加人家公司的派對。原來在沙灘舉行,此沙灘當然不是香港那種,它的外形長相跟澳州的黃金海岸有點似,只是少一點燈光和人氣。來到海灘,人家事無已打好地鋪,大概有三分之二的籃球場大。再放上棹和椅。一位以色列朋友跟我說,很見遠處的燈光距離我們五公里就是加沙(Gaza Strip)。我想唔係禁近下,萬一射飛彈來走去邊,我問他,他說飛彈射程40公里,好係頭上過,叫我地唔駛驚。後來又話講笑喎,加沙邊有這麼多燈。
這個沙灘,風很大,浪很激。如果在這裡享受露天風呂,都叫是人生快事。不過我們從七點多吹風吹到差不多十點正。很高興,期待己久的晚餐終於有著落。食完暖返D就閃返酒店休息下。
2008年5月12日 星期一
2008年5月11日 星期日
讀書的藝術
剛看到一本書,作者說讀得太多書會壞腦。何解?作者話讀書只是將作者的想法或經歷重複,讀者不須思考就得到知識。他認為人的思考方為重要。如果永遠重複別人的思想就會失去創作力。所以當讀完一本書後,應將之全部忘掉免得影響創作力及思考力。
作者是誰?叔本華(Arthur Schopenhauer),19世紀德國哲學家。他的思想解析人生的本質。現在看他其中一篇中譯作品名為: 雋語與箴言,Counsels and Maxims 德文 "Paranesen und Maximen"是處世智慧錄 (Aphorisms on the Wisdom of Life "Aphorismem zur Lebensweisheit") 的第五章。
下次再寫多一些叔本華的思想給大家複印一下。
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