w*******U
发帖数: 256 | 1 i programmed two codes using staggered and collocated grids to solve the
incompressible N-S equation in a Cartesian box with no-slip boundary
condition (lid driven flow). i used predictor-corrector method to decouple
velocity and pressure and imposed zero normal gradient for pressure boundary
condition in both codes. in the code of staggered grids, everything is fine
whereas in the code of collocated grids the velocity is fine but the
pressure drops always and cannot converge. could anyone help ... 阅读全帖 |
|
k*********g
发帖数: 791 | 2 the direct reason that staggered grid works while collocated grids fails:
for an array of probelms with not-generally-correct boundary conditions, the
staggered grid has a built-in mechanism to avoid trouble. for example, if
you add body force to the system and your interest is in the velocity field,
then on the staggered grid the the gravity will be automatically taken care
of by the pressure which should be the case in the continuous sense (
gravitational potential can be simply added to the p... 阅读全帖 |
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w*******g
发帖数: 99 | 3 Could anyone recommend some good books about collocation methods and
spectral methods? Introductory level will be better... Thank you! |
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k*********g
发帖数: 791 | 4 这几天我一直忙着做网站。
Discontinuous的目的好处：
1 flux control across inter-element boundaries，这样有利于local
conservation; local conservation is beneficial for a better nature of the
discrete system, so that less iterations are required for convergence. also,
flux control is essential for shock/crack caturing schemes.
2 有利于并行计算; the reason behind is a little sophisticated but numerical
practice obviously demonstrates this fact.
DG, discontinuous galerkin, 在计算固体力学领域经常成为 DG FEM 的代名词，但是
，有限元做成 discontinuous 是没有太多意... 阅读全帖 |
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k*********g
发帖数: 791 | 5 这几天我一直忙着做网站。就你关于sem的评论说一下。
Discontinuous的目的好处：
1 flux control，这样有利于local conservation
2 有利于并行计算
DG, discontinuous galerkin, 在计算固体力学领域经常成为 DG FEM 的代名词，但是
，有限元做成 discontinuous 是没有太多意义的，性能提高很少，却麻烦了很多。为
啥，我有点忘了为啥，但这是我几年前下的结论。如果真的要用有限元，还是
classical的continuous finite element method性价比高。
在scientific computing领域，galerkin的定义比较混乱，经常这一波人说的galerkin
和那一波人说的galerkin不是同一个意思。我认为，galerkin这么定义比较canonical
：用best fitting方式、主体在transform space计算的称之为galerkin。
这个定义是照顾了spectral method community的习惯，有点anti有限元的，因为在有
限元，g... 阅读全帖 |
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c***r
发帖数: 1570 | 6 手上正好还有这本书，再翻了翻。
collocation没有那么神话，在我看来就是基于chebyshev + gauss /gauss-lobatto的
高阶有限差分而已。此外，collocation方法出来的stiffness matrix永远是非对称的
，增加求解难度和时间。collocation 做multi-domain就是灾难。collocation做
hyperbolic,parabolic也是灾难。 |
|
g********g
发帖数: 2172 | 7 还是COLLOCATION好, 现在DELL的1U服务器, 双 Xeon CPU, 16GB,内存, 加RAID也才~
1700. COLLOCATION 100一个月, Dedicated Server 这种配置要至少300多一个月. |
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k*********g
发帖数: 791 | 8 canonical definitions of galerkin methods and collocations methods.
the definition of galerkin methods vary in different communities of
scientific computing.
since spectral-based methods will be the future of numerical computation for
continuum, the canonical definition of galerkin sort of follows the bible "
C. Canuto, M. Y. Hussaini, A. Quarteroni, and T. A. Zang. Spectral Methods,
Fundamentals in Single Domains. Springer-Verlag, 2006":
if the core computation is conducted in the transformed s... 阅读全帖 |
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j****x
发帖数: 943 | 9 As to the definition of galerkin and collocation method, in general, shouldn
't that be: collocation=exact fitting on nodes and galerkin=best fitting, i.
e. minimum of residual? |
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A****0
发帖数: 12393 | 10 and by the way
old guy, you do need to polish your langugage,
To prevent does not make a correct collocation with fear |
|
v***o
发帖数: 1554 | 11 一般大家都说放屁。
放和话这个collocation, 在汉语里不常见。
放话这个词本身也有大嘴信口胡说的以为。
比如，这个地区领导人又放话了。 |
|
r*******3
发帖数: 35 | 12 Ask.com, Oakland, CA
Java Engineer
Responsibilities
Hands-on end-to-end development to create new technical solutions and evolve
our current question and answer site.
Provide architectural, design and engineering leadership to influence Java
and client-side solutions
Work closely with other engineering teams to define and develop solutions to
real-world problems
Perform research and development to evaluate new technologies, ideas and
communicate value for company
Required Experience
Java - 5 ye... 阅读全帖 |
|
g********g
发帖数: 2172 | 13 In US, all ISP can access each other. No inter-access issues like what
caused by 电信 and 网通 in China. In US, there are thousands of ISPs if not
more. Major player has their own backbone networks while smaller one just
rent a few connection from these major players. So just find a ISP that
meets your requirements (location, price, connection speed, stability, etc.)
and start your site. In many cases, you do not need to worry about
collocate your own server. You can just rent a dedicated server, VP |
|
g********g
发帖数: 2172 | 14 我看到了网上很多说 http://www.dedicatednow.com/ 不错, 昨天晚上订了一个, 不过还没有切身体验, 我以前都用COLLOCATION. 现在看到很多dedicated server配置也很好了, 所以新的改用dedicated server了. |
|
g********g
发帖数: 2172 | 15 I do not like VPS too. I used VPS for 1 month at the very beginning then
changed to dedicated server, later to collocation, now back to dedicated
server.
会谈一个比网上价格好些的价格 |
|
g********g
发帖数: 2172 | 16 I have two collocation servers. I have never spend anytime on hardware
maintenance. I put them there and forgotten them, never have problem. |
|
g********g
发帖数: 2172 | 17 Better use collocation hosting services.
ip |
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j*******o
发帖数: 102 | 18 我也有在家HOSTING的计划，但还没有买SEVER，我的计划是RACK SERVER＋FIOS
INTERNET CONNECTION，每月花费大约是１５０USD，collocation hosting services
是我的第二个选择。 |
|
D******y
发帖数: 3780 | 19 collocation对地理位置要求比较高。。。很多人没有这条件阿 |
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j*****g
发帖数: 194 | 20 弱弱地问一句，COLLOCATION和Dedicated Server有啥区别？对COLLOCATIO不是很了解
，请教了～～ |
|
g********g
发帖数: 2172 | 21 COLLOCATION: 你自己买机器, 装好了运过去, 你负责管理机器, 他们负责网
Dedicated Server: 他们的机器, 他们装好了基本的系统给你, 他们负责网, 有些让你
自己管理机器, MANAGED SERVER, 他们负责管理机器.
同样配置的机器, Dedicated Server可能不那么好, 虽然看着也是2GB, XX CPU, 多少
硬盘SIZE, 实际上可能其他货不见得是好东西, 可能比你自己买的要慢点. |
|
g********g
发帖数: 2172 | 22 还好啊, 16GB的机器1千多就可以拿下了, 然后99$ COLLOCATE, 3年平均下来也就是150
一个月. |
|
g********g
发帖数: 2172 | 23 1. It is hard to cover sound. Too tight cover can cause overheating to the
server. Unlike desktop, noise is not a design issue for server since they
are suppose to be placed in hosting center. Different servers have different
levels of noise. For a one U server, it probably has the same level of
sound as you drive on highway.
3. not much probably <30 milli-seconds. Visitor normally will go through a
few extra router to reach your home compared with collocations.
Different servers have different |
|
g********g
发帖数: 2172 | 24 Depend on how you look at it. For example, the FIOS business is $104 for 5
static ip, 25m/25m. You probably can get 5 ip with 1000GB data per month
collocation for $100 per month. What you have saved is the home broadband
fee, which can cost $50 per month. |
|
g********g
发帖数: 2172 | 25 对小机器从速度上来说是没有大优势. 速度由, RAM, CPU, DISK IO, BUS SPEED, 决定.
Server的优势是COLLOCATION 体积小, desktop 太大. 网卡, 电源稳定一点, 散热好.
需要大RAID的话, 有的Server可以插几十个硬盘. |
|
n*******y
发帖数: 3337 | 26 collocation $100 is for 1U.
For FIOS business, you can host 5 physical servers at home. |
|
g********g
发帖数: 2172 | 27 My Home Server is for development only. It is accessible from outside though
. All my sites were hosted via collocation. Home server can be better or
worse than shared hosting, depend on your requirement.
using |
|
c**t
发帖数: 9197 | 28 开发工具的话TT ADL 最简单明了，而且collocate |
|
x****e
发帖数: 1780 | 29 可以multithreading 同时搞50个股票阿。你能搞个赚钱的全自动系统吗。
信号不在于多，而在于准确性。你一天生成100个信号，60个是错的有屁用阿
你妈Chicago的小trading firm 发财的太多了。都是从小做到大的，赚钱了再搞server
collocation之类的锦上添花的东西 |
|
x****e
发帖数: 1780 | 30 可以multithreading 同时搞50个股票阿。你能搞个赚钱的全自动系统吗。
信号不在于多，而在于准确性。你一天生成100个信号，60个是错的有屁用阿
你妈Chicago的小trading firm 发财的太多了。都是从小做到大的，赚钱了再搞server
collocation之类的锦上添花的东西 |
|
c*********n
发帖数: 2120 | 31 Thank you very much!
What do you think about the student awards?
Also, I have not seen many people used funding to claim for contribution, so
not very confident. I will try to get some letters from the funding agency
and other labs which are interested in collocations. I can claim they want
to collaborate because of the contribution I already made.
Does these sound reasonable? |
|
d*******e
发帖数: 251 | 32 应该有那么三五篇。。但杂志很一般。。
Keywords: web applications, collocation extraction, expert systems, search
engines.
站内信吧，请附上简单个人简历，谢谢。 |
|
M****7
发帖数: 13407 | 33 very normal appearance and a banana figure. looks like a male from the
second pic. But, she earns $$$ and is greatly concerned about her clothing
collocations. |
|
p********r
发帖数: 1980 | 34 This is most likely an urban legend.
In the case of Complete and Finished, they are not only not exact synonyms,
they have different collocations. I'm sure a room full of linguistic experts
would have better things to do than to give a standing ovation on this. |
|
b***e
发帖数: 7 | 35 这个说的很对。
我在AWS上每个月的花费大概是800块钱，用它的spot instance，挺省的。工具多，效
率高。服务种类也多基本满足所有需要。
如果你的网站需要达到enterprice level机器和网络性能，用aws是最好的选择。这个
比租用datacenter collocation 合算多了，又不需要购买机器的最开始开销。 |
|
k***y
发帖数: 217 | 36 of 1323275 417 9.694417
your 101863 117 9.257870
the 2872094 698 8.425464
and 1369241 376 7.702504
his 242189 126 7.653631
captured 1128 50 7.044663
my 95658 61 5.782947
little 32454 43 5.738227
caught 5064 31 5.417216
s 596267 168 5.346859 |
|
k***y
发帖数: 217 | 37 for "accumulate",the possible collocations are as follows:
to 1375856 88 6.601654
you 453117 26 3.415150
points 9214 9 2.941802
able 14868 9 2.906089
will 152423 10 2.248932
dollar 28223 6 2.231160
time 92507 8 2.208680
capital 6957 5 2.177113
money 25274 5 |
|
b**L
发帖数: 646 | 38 五
恰巧南宗画创始人王维也是神韵诗的大师，而且是南宗禅最早的
一个信奉
者。《王右丞集》卷二五《能禅师碑》就是颂扬南宗禅始祖惠能的，
里面说：
“弟子曰神会……谓余知道，以颂见托”；《神会和尚遗集·语录第
一残卷》记
载“侍御史王维在临湍驿中问和上若为修道”的对话。在他身上，禅
、诗、画三
者可以算是一脉相贯，“诗画是孪生姊妹”这句话用来品评他是最切
不过了。苏
轼《东坡题跋》卷五《书摩诘<蓝田烟雨图>》说：“味摩诘之诗，诗
中有画；观
摩诘之画，画中有诗”；《凤翔八观·王维吴道子画》说得更清楚：
“摩诘本诗
老，佩芷袭芳荪，今观此壁画，亦若其诗清且敦。”纪昀评点苏诗说
：“‘敦’
字义非不通，而终有嵌押之痕”，指摘得很对；“敦”大约是深厚之
“义”，可
参看张彦远《历代名画记》卷一《论画山水树石》：“又若王右丞之
重深”，但
和“清”连用（collocation），就很牵强流露出凑韵的窘态了。
沈括《梦溪笔谈》卷一七：“书画之妙，当以神会，难可以形器
求也。如彦
远画评言，王维画物，多不问四时，如画 |
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R*o
发帖数: 3781 | 39 6:5 In v. 5 Paul further explains (gavr, gar) how it is that we can walk in
new life. We do so because of the ongoing effects of our participation in th
e death of Christ and our current participation in the resurrection of Chris
t. The future tense, “we will certainly also be united,” refers not to the
eschatological future (cf. John 5:28-29), but rather to the future with res
pect to the logic of the process of salvation. First, we are reckoned dead w
ith Christ, then we are reckoned to partic... 阅读全帖 |
|
k*********g
发帖数: 791 | 40 目前最优秀的dsem（disocntinuous spectral element method）是：
chebyshev collocation spectral；
但是藕相信还有一种更好的存在；
还需要做很多研究； |
|
m******i
发帖数: 834 | 41 ☆─────────────────────────────────────☆
kennkqzhang (kenn) 于 (Mon Sep 27 16:20:44 2010, 美东) 提到:
即便在有限元擅长的regime、也恰好是性态很好的很容易求解的regime，如elliptic、
parabolic问题，也有一种数值方法比它快10~100倍；
让藕匪夷所思的是，为什么这么retard的东西会存在50+years。。。
☆─────────────────────────────────────☆
kennkqzhang (kenn) 于 (Sun Oct 31 06:47:05 2010, 美东) 提到:
一个产生的矩阵有几百个非零元素的数值方法；
比一个bandwidth只有几个元素的方法；
要慢10到100倍；
（一般来说）；
☆─────────────────────────────────────☆
kindlefan (maxwell) 于 (Sun Oct 31 14:34:49 2010, 美东) 提到:
请展开说说.
有限元的成熟... 阅读全帖 |
|
r*****3
发帖数: 143 | 42 中文名: 挖掘社交网络
原名: Mining the Social Web: Analyzing Data from Facebook, Twitter, LinkedIn
, and Other Social Media Sites
作者: Matthew A. Russell
图书分类: 软件
资源格式: PDF
版本: 英文文字版/更新源代码
出版社: O'Reilly
书号: 978-1449388348
发行时间: 2011年
地区: 美国
语言: 英文
简介:
内容简介：
Popular social networks such as Facebook and Twitter generate a tremendous
amount of valuable data on topics and use patterns. Who’s talking to whom?
What are they talking about? How often are they talking?
This concise and practical book shows you how to... 阅读全帖 |
|
a***n
发帖数: 262 | 43 PVDMs are in gateways or SBC, they are hardware CUCM can use.
CUCME might be collocated to gateway itself.
be classified as hardware right? and call manager (CUCM or CUCME) knows
their exsistence. |
|
d***a
发帖数: 13752 | 44
那个是假蓝牙。:)
http://en.wikipedia.org/wiki/Bluetooth#Bluetooth_v3.0_.2B_HS
Version 3.0 + HS of the Bluetooth Core Specification[31] was adopted by the
Bluetooth SIG on 21 April 2009. Bluetooth 3.0+HS provides theoretical data
transfer speeds of up to 24 Mbit/s, though not over the Bluetooth link
itself. Instead, the Bluetooth link is used for negotiation and
establishment, and the high data rate traffic is carried over a collocated
802.11 link.
如果对音质要求不高的话，Bluetooth也够用了。现在的蓝牙耳机，我的理解，
还是因为耳机上的codec做... 阅读全帖 |
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h****e
发帖数: 2125 | 45 For HFT what matters is tick-to-trade latency in their trading
applications,
usually on same host of coz. Network latency is out of their control,
and is same to everybody if collocated. |
|
h**********c
发帖数: 4120 | 46 team had a mini turnaround, just two days.
搞了bluemix cloud deployment, node.js/tomcat app server, bluemix app/service
, nlp/nlc, adroid/iphone.
总体讲ibm还是扎实做技术的，文档也很清晰。
去年研究cloud,cloud居然也有downtime.以前讲datacenter 不好，但可以collocation
分布提供HA。cloud怎么也会有downtime，它本身不是分布HA的吗？azure和google的工
程师年能不能一个月以后来解释解释。 |
|
h*****2
发帖数: 2070 | 47 去看各家的SLA，写得清清楚楚。
这世界上哪儿有不出问题的系统？
service
collocation |
|
h**********c
发帖数: 4120 | 48 来自主题: Programming版 - 数值计算 感觉您是我聊过最大牛的ID，
我这点东西也七八年不碰了就是晒晒吧，PDE我没做过，老板有一个硕士我见过这人老
中，给他做过PDE网格，三角化，我理解是通过网格的精细化来保证收敛。老板说过一
个人在做navier stoke,可能打错了。我这么专的人，当然很感兴趣。不过老板给过我
一个小模型，让我解解看，数值解，ODE，我两个晚上没弄出来，可能觉得我不行，我
是纯CS，偏重计算机图形，本加硕都是加拿大的。老板那个硕士据说是南大数学系的或
着计算机双修的，奥数金牌等等，没考证过，门清者自门清，不需要我多嘴，水平可定
是有的，可能也在MMT混，有两三面之源，没有深交。
说到我做过什么基本都在我个人主页我以前公开过，从来也不是什么秘密，我还在雀斑
出没，所以你如果www.heteroclinic.net有什么有兴趣的东西，我寻找VC。
单说科学计算，我干过什么吧，解ODE，我做过两个模型，一个是CR3BP，通俗说是地球
月亮卫星三体，光这个模型的MATLAB code画图就的上千行MATLAB，python 加上C++/
OPENGL的code 就几万，行数不重要，重要的是理解什么东西干了什么... 阅读全帖 |
|
h**********c
发帖数: 4120 | 49 来自主题: Programming版 - 数值计算 感觉您是我聊过最大牛的ID，
我这点东西也七八年不碰了就是晒晒吧，PDE我没做过，老板有一个硕士我见过这人老
中，给他做过PDE网格，三角化，我理解是通过网格的精细化来保证收敛。老板说过一
个人在做navier stoke,可能打错了。我这么专的人，当然很感兴趣。不过老板给过我
一个小模型，让我解解看，数值解，ODE，我两个晚上没弄出来，可能觉得我不行，我
是纯CS，偏重计算机图形，本加硕都是加拿大的。老板那个硕士据说是南大数学系的或
着计算机双修的，奥数金牌等等，没考证过，门清者自门清，不需要我多嘴，水平可定
是有的，可能也在MMT混，有两三面之源，没有深交。
说到我做过什么基本都在我个人主页我以前公开过，从来也不是什么秘密，我还在雀斑
出没，所以你如果www.heteroclinic.net有什么有兴趣的东西，我寻找VC。
单说科学计算，我干过什么吧，解ODE，我做过两个模型，一个是CR3BP，通俗说是地球
月亮卫星三体，光这个模型的MATLAB code画图就的上千行MATLAB，python 加上C++/
OPENGL的code 就几万，行数不重要，重要的是理解什么东西干了什么... 阅读全帖 |
|
i***0
发帖数: 160 | 50 For GPCR internalization, you can try beta-galactosidase complement assay.
search if DiscoverRx has already made the corresponding cell line. That
assay can give you sig/background=10. Internalized GPCR (tagged small
subunit of beta-gal) collocalized with endosome anchored marker protein (
tagged with large subunit of beta-gal) will boost beta-Gal activity. I have
tried this assay. once you have the stable cell line, the protocol is very
simple and the result is very potent. |
|
