Categories
生活

新玩具:Trek X-Caliber 8

Finally went out and bought my first “proper” mountain bike: Trek X-Caliber 8.

Colours
Volt Green

Frame
Alpha Gold Aluminium w/semi-integrated head tube, mechanically formed & butted tubing, race geometry, internal front derailleur routing, G2 Geometry on 29ers

Front suspension
RockShox XC32, coil spring, rebound, TurnKey lockout, custom G2 Geometry w/51mm offset on 29ers, 100mm travel

Sizes
15.5″ (27.5″ wheels)

Front hub
Formula DC20 LW alloy

Categories
家为大 生活

水中的精灵

Categories
家为大 生活

Boys Biking In Lysterfield Park

Categories
家为大 生活

Boys At Beach On Summary Days


Smiths Beach At Phillip Island


Point Lonsdale

Categories
胡言乱语

十手Toyota Prado

2005年版Prado Grande。廉颇老矣,尚能饭否?

Categories
DIY 生活

Upgrading the Navigation Maps on Toyota Prado 120

To save the cost on getting the upgrade from the greedy dealer for ridiculous $300 charge, simply download the image from Internet, burn it onto a DVD+R disc using any DVD burner software, then put it into your car.

I found DVD+R disc works best. I used TDK DVD+R Dual Layer but others reported Imation DVD+R works too. I used to use Philips DVD-R but they do not seem to work with the DVD drive in the Car navigation unit.

The latest version of Map I can found from Internet is Whereis V20 (2013). Good enough for me.

This should apply to most Toyota (including some Lexus models) that using DVD disc as the navigation map storage.

Categories
生活

重拾单板 – Mt Buller 单板滑雪

前年开始学习单板,分别在Mt Buller和Mt Hotham滑了三天,非常的喜欢这种自由和刺激的感觉。可惜去年由于家庭方面的事情没有机会再去玩。今年突然想开了,于是买齐了单板,binding, 靴子,雪镜和头盔,雪裤,这就上山去也。过去一个月,每周一次,每次6个小时车程,在山上8个小时。到现在自我感觉技术提高了不少,人也晒黑了很多,而且居然没受什么伤。可惜澳洲2014年的雪季也算是到尾声了,明年再见。

照片

Youtube视频

看不到Youtuber的可以在本页面最下处看优酷。


时间:2014-08-14
地点:Mt Buller, Victoria, Australia
摄影:R.Q
音乐:《怒放的生命》汪峰
使用GoPro HERO3+ Silver Edition拍摄。


时间:2014-08
地点:Little Buller Spur Run, Mt Buller, Victoria, Australia
摄影:C.Q
音乐:《信仰在空中飘扬》汪峰
使用iPhone拍摄。

以上视频拍摄过程中除主角外并无人畜受伤。

总结

1. 重心仍然不够低
2. switch还不够流畅
3. 速度保持不够,导致稳定性不佳,尤其是尝试carving时
4. 手的引导和辅助稳定不足,转肩动作做的不好
5. 陡的坡上由于switch太慢,导致速度控制不好,产生恐惧感。

优酷视频


Categories
家为大 胡言乱语

单身父亲的一些感受

和前妻分开一年有余了。中间历经人生百味,这里只想说说自己对作为两个孩子的单身父亲的体会。

虽然过去自己经常单独带两个小盆友出去玩,但是还真没有从早到晚24小时连续几天一个人带过他们,加上自己知道自己有时候缺乏耐心,所以一开始还是颇有点惴惴不安,不知道自己是否能应付过来。事实证明的确很累。一早睁开眼就开始忙,张罗早饭,然后带去上课的上课,要玩的带去玩,中午又要计划吃什么,回到家又要安排他们玩,准备晚饭,经常感觉从早到晚都在不停地煮饭或者是洗碗,只有到晚上九点讲完故事都睡了才可以坐下喘口气。虽然累,但是做的心甘情愿。再加上自己也喜欢做点吃的,所以也不觉得太糟糕。也许以前虽然为人父母,但是平时都有孩子们的母亲在,自己还是偷了很多懒,现在该是还债的时候了。

另一方面,因为没有了母亲和爷爷奶奶外公外婆等等的干扰,孩子们更加听话,更省心了。而单独和孩子们在一起的时间里,bonding自然得到了加强,看着孩子们灿烂的笑容,一切烦恼和劳累都可以抛到脑后。

无论如何,现在小朋友们已经自己会:

  • 穿衣服,虽然经常穿反
  • 刷牙,虽然刷完牙膏四处都是
  • 扫地,虽然事后我往往要再扫一次
  • 收拾自己出门的东西,背包,水壶。虽然水壶里总是只装一半的水,另外一半在衣服上。
  • 吃完饭收拾碗筷

这也是可以让自己足以欣慰的事了。

上周一个人带孩子们出去露营了三天。起先以为这也许会是最大的挑战。但是发现不比在家辛苦。只要给孩子们安排好足够的活动,他们还是蛮充实的。只是自己最近身上带了一些伤痛,所以一个人要煮饭收拾,感觉蛮辛苦的。好在孩子们还听话,还能帮点小忙,所以也算是顺利度过。下次可以尝试更长时间。

当孩子们不听话或者做作业不认真的时候,偶尔自己还是会失去耐心,对孩子们大声吼。事后自己知道这样做不对,总是很后悔。希望他们以后能够理解和原谅。老爸还是会努力改进的。

总之,单身父亲真不是件多么可怕的事情。

露营点
孩子们
Categories
程序员 网络撷翠

TCP/UDP/Unicast/Multicast

Multicasting
I simplified the TCP/IP/UDP discussion up there a little when I implied that IP (and hence UDP and TCP) would route packets from one device on a network to another device. More accurately, IP routes packets from one IP address to another IP address. The trick with multicasting, or sending the same packets of data at the same time to many devices is that certain IP addresses can be designated as multicast address and assigned to many devices at the same time.

The first thing to know about IP multicasting is that there only exists UDP multicasting. There’s no such thing as TCP multicast. Why not? See, the point of multicast is to be efficient with the network and send the same data packet to as many different, possibly unknown computers. But each TCP connection can potentially require retransmission of different lost packets, or different delays or ordered arrival and assembly of packets. So managing and sending all that for each possible device would be resource-intensive even if it were possible, which would defeat much of the point of using multicast. (And it’s not possible anyway because multicast can’t know where the outbound packets actually wind up.)

Oh, and via back-formation, regular non-multicast UDP (and TCP) messages are called unicast.

The next thing to know is that multicast will often not be sent over a router to another network. There are a few reasons why:

 

    • A low TTL for most multicast packets: All IP packets have a time-to-live, or TTL. Unlike with DNS records, TTL on IP packets refers to the maximum number of network hops that a packet can make to get to its destination. Unicast packets typically are allowed to cross about 30 networks (i.e., get routed by, or “hop”, 29 routers). Getting across the internet rarely takes more than 15 hops, so the limit is really just to kill packets if they get stuck in loops in badly configured networks. But most applications that send multicast set the TTL to a low number, often zero (where the message doesn’t even leave the originating device),

 

    • one (so it will go only to computers on the local net), or two (where it will cross a single router). It’s quite rare to have an application that is intended to multicast to unknown machines over an entire campus network, much less the entire Internet.

 

    • High TTL thresholds set on most routers: Many network routers, particularly WAN routers and internet gateway routers, have a higher TTL threshold set, such that they won’t send out multicast packets whose TTL is below (say) 15. This is intended to prevent accidental leakage of multicast off a local network.

 

    • Routers are simply not configured to route multicast at all, or only configured for specific addresses, or otherwise blocking multicast packets.

UDP multicast might seem a bit exotic, but it’s actually more common that you think. It’s not used for web video sites like YouTube, since those need to send a video at a time each user demands, rather than at the same time for all users, and it’s not used for VoIP traffic. However, it is used for a lot for discovery and automatic confguration in apps like Skype, iTunes, and uPnP. It’s also used in a few places in the WCI portal.

From https://blogs.oracle.com/lmukadam/entry/tcp_udp_unicast_multicast_i_th

Categories
家为大 生活

孩子们长大了,我很欣慰

一早起来忙碌着收拾去朋友的农场一日游的行李,虽然东西不多,却也在门口堆了几个包。正在玩汽车的不到五岁的小柏突然过来问道:“爸爸,can I help? ”正在忙的我心不在焉地回答:“what?” 小柏道:“爸爸,我说 is there anything I can help?”我心里忽然一热,抱着小柏狠亲了一下。然后父子俩把东西搬上了车。

在农场Tintin和小柏一起拾了不少Freerange的鸡蛋。吃完午饭,正在外面玩的Tintin忽然过来跟我若有所思地说:“爸爸,我想再捡一些给妈妈一个 Surprise。”于是又和弟弟再去捡了一包带回去给妈妈和外婆。

终于知道我们自己小时候爸妈说我们懂事了的意思。