r*******e
发帖数: 7583 | 1 直接geohash的话，怎么快速找出5mile之内的其他geohash key？
我觉得可以把map按照经纬坐标划为很多grids
每个grid用左上角+右下角坐标当key，value是在这个grid里的POI list
对一个给定的位置，可以很快算出与5mile为半径的圆重合的grids
然后把这些grids的POI读出来，按距离排一下，把超过5mile的过滤掉
至于这个grid的granularity，就是需要讨论的细节了 |
|
p*****3
发帖数: 488 | 2
假设用曼哈顿距离。
是不是可以做这么几个layer,
一个是客户端 + web server，用来接收命令发送命令
一个是Aggregators,server group，这里每台aggregator根据范围计算出包含的grids
Aggregator根据grids的hash code发送grids到多台对应indexing servers,
indexing server 在内存搜索对应小grid的所有POI ids. POI ids在这里可以根据user
personlization 进行score和sort (score的data从哪来？怎么score?)
每台indexing server发送POI id request 到 data storage level
data storage level 外层是memcache, 下面是DB group，实现快速的POI id meta
data的提取
所有消息原路返回在aggregator做merge后返回发送的web server
所有POI的改变有个off line的系统batch, 发给整个系统更新indexing, DB... 阅读全帖 |
|
r*******e
发帖数: 7583 | 3 直接geohash的话，怎么快速找出5mile之内的其他geohash key？
我觉得可以把map按照经纬坐标划为很多grids
每个grid用左上角+右下角坐标当key，value是在这个grid里的POI list
对一个给定的位置，可以很快算出与5mile为半径的圆重合的grids
然后把这些grids的POI读出来，按距离排一下，把超过5mile的过滤掉
至于这个grid的granularity，就是需要讨论的细节了 |
|
p*****3
发帖数: 488 | 4
假设用曼哈顿距离。
是不是可以做这么几个layer,
一个是客户端 + web server，用来接收命令发送命令
一个是Aggregators,server group，这里每台aggregator根据范围计算出包含的grids
Aggregator根据grids的hash code发送grids到多台对应indexing servers,
indexing server 在内存搜索对应小grid的所有POI ids. POI ids在这里可以根据user
personlization 进行score和sort (score的data从哪来？怎么score?)
每台indexing server发送POI id request 到 data storage level
data storage level 外层是memcache, 下面是DB group，实现快速的POI id meta
data的提取
所有消息原路返回在aggregator做merge后返回发送的web server
所有POI的改变有个off line的系统batch, 发给整个系统更新indexing, DB... 阅读全帖 |
|
m********0
发帖数: 2717 | 5 小青蛙一只，轻拍。
最近比较focus on money management，尤其是position sizing。
这里绝大部分都是跟我一样的beginner，基本上很看重入点，什么时候买最好。我转到
期货和外汇以后在这上面下了挺大的功夫，并没有达到原先预想的效果（包括SVM，
Linear，Non-Linear，Wavelets，HONN, Kalman Filter，这些可能以后会有一定的突
破，但现有的概念和理论，实践起来的效果并不会提高多少，甚至没有提高，所以投入
产出比不佳），加上我一年多几千次浅显的交易经验给我的感觉是，入点远没有想象的
重要。50%的正确率够不够？我感觉远大于盈利的需求。
下面的blog有介绍expectancy的重要性，前两天我也引用了他的Risk Adjusted Profit
的概念，把纯profit 算作profit realized - stop loss level（the risk you took,
in fact,
should be more than stop level as it's dangerous to use stp ... 阅读全帖 |
|
a******n
发帖数: 206 | 6 先声明：我没有站边, either pump or dump btc. 只是读到了自己觉得不错的文章，
分享过来，想听听大牛怎么说。
链接在此：https://blog.chain.com/a-letter-to-jamie-dimon-de89d417cb80?from=
singlemessage&isappinstalled=0
原文很长。总结如下。
Cryptocurrencies (which I prefer to call crypto assets) are a new asset
class that enable decentralized applications
Decentralized applications enable services we already have today, like
payments, storage, or computing, but without a central operator of those
services
This software model is useful to people who need c... 阅读全帖 |
|
e*****3
发帖数: 541 | 7 电费账单分两部分：
1.发电
2.输电
输电部分是没法换的，你家的电线杆子是谁家的由不得你做主。
发电部分是可以选的。
大家可以看看这个：(从LEXINGTON email拿来的，供参考，注意，里面有推销员的名字）
From: Peggy Wang <[email protected]
(function(){try{var s,a,i,j,r,c,l,b=document.getElementsByTagName("script");l=b[b.length-1].previousSibling;a=l.getAttribute('data-cfemail');if(a){s='';r=parseInt(a.substr(0,2),16);for(j=2;a.length-j;j+=2){c=parseInt(a.substr(j,2),16)^r;s+=String.fromCharCode(c);}s=document.createTextNode(s);l.parentNode.replaceChild(s,l);}}catch(e){}})();
/* ]]> */
>
To... 阅读全帖 |
|
e*****3
发帖数: 541 | 8 From my old post. You can call to get a new rate.
From: Peggy Wang <[email protected]
/* */>
To: Lexington Friends <[email protected]
/* */>
Sent: Saturday, September 27, 2014 9:13 PM
Subject: [LexingtonFriends] How you can save on your electric bills, by
signing up with Viridian 3 years fixed plan by the end of this month 9/30/14
- this rate won't last!
Dear friends
As yesterday’s Boston Globe’ front page says the electric rates in state
is climbing up for winter. National Grid is g... 阅读全帖 |
|
k****i
发帖数: 1072 | 9
DataGrid grid = new DataGrid() ;
grid.AutoGenerateColumns = false;
BoundColumn column = new BoundColumn() ;
column.HeaderText = "Name";
column.DataField = "Name";
grid.Columns.Add(column);
HtmlForm form1 = (HtmlForm)this.FindControl("Form1");
form1.Controls .Add(grid);
if (!IsPostBack)
{
Employee[] people = new Employee[] { new Employee("1", "Steve") , new
Employee("2", "John") , } ;
grid.DataSource = people;
grid.DataBind() ;
} |
|
O*******d
发帖数: 20343 | 10 说一下我怎么做的antialiase。 先把图形计算好，比最后的图像多出宽三列高三行。
图形是一个浮点数的点阵。 两个相邻的点之间的距离是一个单位。 然后用三次方程插
值。每个插值要用图形中4X4的值来计算。 在四个点组成的方格中均匀插入5X5=25个点
（单核机）或7X7=49个点（多核机），给每个插值赋予颜色，最后把一个方格中所有的
颜色平均，就是一个像素的颜色。
由于一组插值用的是同一套三次方程系数，所以写了一个class来做。 其实是一个
template。 做插值时，有两个套着的循环，分别在X方向移动和Y方向移动。 内循环是
在Y方向从上往下移动，这样每次移动一步，只需要计算最后一列的三次方程系数。下
边是我写的Cubic Interpolator. 是一个recursive template。For bicubic
interpolation, N = 2. 所有的重复计算都尽可能的避免了。 这个templete的计算
速度，在N==2时，是单独bicubic interpolation的速度的三倍。
template
class Cu... 阅读全帖 |
|
w*****1
发帖数: 473 | 11 Thank you very much for your help!
我改了CODE如下： 现在已运行了1小时还没有停止，大家能否帮我看看？ 谢谢！
data parents; set csgl.individs;
keep i QTP pedid dgeno;
if i <=2;
run;
option symbolgen mprint mlogic;
%macro new(mudaa=, mudab=, mudbb=, de=, dq=, indata=, outdata=);
data &outdata; set &indata;
lnl=log(((1-&dq)**2)*(1/sqrt(2*constant('PI'))*&de)*exp(-0.5*(((QTP-&mudaa)/
&de)**2))+
2*&dq*(1-&dq)*(1/sqrt(2*constant('PI'))*&de)*exp(-0.5*(((QTP-&mudaa)/
&de)**2))+
(&dq**2)*(1/sqrt(2*constant('PI'))*&de)*... 阅读全帖 |
|
S*********y
发帖数: 481 | 12 Second India blackout in two days cuts power to 670 million
By Frank Jack Daniel | Reuters
NEW DELHI (Reuters) - Grids supplying electricity to half of India's 1.2
billion people collapsed on Tuesday, trapping coal miners, stranding train
travelers and plunging hospitals into darkness in the second major blackout
in as many days.
Stretching from Assam, near China, to the Himalayas and the northwestern
deserts of Rajasthan, the outage was the worst to hit India in more than a
decade and embarrass... 阅读全帖 |
|
|
l****z
发帖数: 29846 | 14 Expansion of Disability Fraud Under Obama: Puerto Ricans Get U.S. Disability
Benefits for Inability to Speak English; Disability Deal Explained
New Meaning of Disability
Here is a curious story on the meaning of "disability".
Please consider Lack of English Meant Puerto Ricans Got Disability Benefits.
A federal audit has found that some Puerto Ricans living in the U.S.
territory have received disability benefits in part because they could not
speak English.
The Office of the Inspector Ge... 阅读全帖 |
|
S*********n
发帖数: 440 | 15 i don't work for any of the smart grid companies, although i do have my
opinion in terms of which ones are likely to win.
i'm not a big fan of the cleantech hype either. poor deployment of capital
and resources potentially create a bubble. if it happens and such bubble
busts, both equity and credit markets will freeze even for good companies.
i disagree that the "overheating" issue led to the booming of smart grid.
the smart grid is propelled by a number of real market drivers. if you're
interes... 阅读全帖 |
|
d**********o
发帖数: 1321 | 16 Senior Design (2): 一次会议一场lie
** Senior Design Meeting
e ([email protected]
/* */)
You replied on 11/4/2014 8:10 PM.
Sent: Tuesday, November 04, 2014 6:10 PM
To:
(me~) ((me~)@xxxx.uxxxx.edu)
Cc:
m ([email protected]
/* */); r ([email protected]
/* */); p ([email protected]
/* */)
Hello (me~),
Today for senior design we had a short meeting where we cleared up some
confusion about the GUI design. The grid which is the main work area will be
static. i.e. it will not ... 阅读全帖 |
|
d**********o
发帖数: 1321 | 17 Senior Design (2): 一次会议一场lie
** Senior Design Meeting
e ([email protected]
/* */)
You replied on 11/4/2014 8:10 PM.
Sent: Tuesday, November 04, 2014 6:10 PM
To:
(me~) ((me~)@xxxx.uxxxx.edu)
Cc:
m ([email protected]
/* */); r ([email protected]
/* */); p ([email protected]
/* */)
Hello (me~),
Today for senior design we had a short meeting where we cleared up some
confusion about the GUI design. The grid which is the main work area will be
static. i.e. it will not ... 阅读全帖 |
|
b***y
发帖数: 2799 | 18 ☆─────────────────────────────────────☆
lipid (老子叫荔枝的时候，还没有超女呢) 于 (Sun Sep 18 22:29:39 2005) 提到:
有个code, 先把一个box分成小盒子 grid,
the number of grid in the x, y, z directions is n_xbox, n_ybox, and n_zbox.
下面的一个code写着
/* pre-computing the inverse distances between grid nodes.
N_sqrts = n_xbox * n_xbox + n_ybox * n_ybox + n_zbox * n_zbox + 1
问题1：为什么要加1？
sqrts[0]=0
for (k=1, k
问题2：这个code的目的很明显是先计算各个grid间的距离的倒数，
所以如果，最小的grid的index是(1,1,1),那末最大的inde |
|
z****e
发帖数: 54598 | 19 好，这时有个thread拿起了segment锁准备执行
计数器更新，但是出于某个原因什么事都没干。
lol
搞笑了，那你怎么不设想一下外星人入侵之后
所有的thread都罢工不干了呢？
我还真没有遇到过，什么某个thread拿起lock不执行的说法
你上次遇到的让机器执行而不执行，4 no reason是什么时候？
这种几率连亿万份之一都说不上，而且毕竟这只是一个grid
你这个grid挂了，其他grid也跟着挂？
搞笑了，其他grid有其他自己的thread，到时候再重启不就行了？
更何况，你每个grid就一个thread，要是这个thread出于某种莫名的理由罢工的话
你该死不一样死？
讨论这个纯粹浪费时间，你丫就是黔驴技穷了，就知道瞎喷
代码我都写完了，测试都测完了，你丫除了瞎吹自己写过还有什么可说的？
现在连scenario让你想都想不出来，还要寄托于未知原因
你有这功夫，不如去灌点垃圾paper，没准还能骗到点稿费
在这里扯这个蛋有毛用，浪费时间 |
|
c******n
发帖数: 16666 | 20 你用的是ng grid不是ui-grid？
如果你用ui的话
重写row的template就好了
他们网站有几个地方没更新
最新版的可用template是
rowTemplate: '
"(colRenderIndex, col) in colContainer.renderedColumns track by col.uid"
class="ui-grid-cell" ng-class="col.colIndex()" ui-grid-cell>
我这行是加了个peekView，就是多了个点击开md-Dialog 的功能 同理你自己也可以搞
其他的
记得把gridApi给暴露出来
someCtrl.gridOptions.onRegisterApi = function (gridApi) {
someCtrl.gridApi = gridApi;
};
in... 阅读全帖 |
|
k****o
发帖数: 83 | 21 序
本文将是博主一系列介绍美国国会议员中的科学家、工程师或发明家中的开篇。
除保证资料的真实性外，不保证任何一篇这类文章的永久公开性，因为被介绍的议员有
可能随时来信要求我撤稿（虽然可能性很低），我必须尊重他人意愿。所以要看趁早看
。另外，政治人物很在乎民意，好评如潮的话，他们巴不得咱多写点，所以，请读者诸
君阅后踊跃推荐。
***
Thomas Massie于1971年，出生在肯塔基州的一个畜牧农场。长大后去了著名的麻省理
工大学（MIT），从本科一直读到硕士学位。
在校期间他就热衷于发明创造，且与现在成为妻子的女友一起创业，办起了一家名为
SensAble的科技公司，研发触觉人机界面设备以及3D打印。毕业后，拉了更多校友入伙
他的公司，筹集了$3200万美元的风投资金，持有24项专利技术，员工达到70人的规模。
下图是这哥们发明并生产的高科技产品：
之后，两年轻人喜结连理，且见好就收，卖了公司，一起返回老家Lewis县几百英亩（1
英亩= 6中国亩）的农场，过起了田园日子，一边养牛种地持家，一边10年功夫连生4个
娃。
咦，为何放弃商机去广阔天地炼红心呢？
小两口都是那种具有传统家... 阅读全帖 |
|
y**h
发帖数: 3093 | 22 WASHINGTON (AP) — The Trump administration on Wednesday completed one of
its biggest rollbacks of environmental rules, replacing a landmark Obama-era
effort that sought to wean the nation's electrical grid off coal-fired
power plants and their climate-damaging pollution.
Environmental Protection Agency chief Andrew Wheeler, a former coal industry
lobbyist, signed a replacement rule that gives states leeway in deciding
whether to require efficiency upgrades at existing coal plants.
Wheeler said c... 阅读全帖 |
|
f*******e
发帖数: 1061 | 23 Construction of China's Type 055 destroyers forges ahead
Commercial satellite imagery taken on 11 April shows that significant
progress has been made in the construction of the first four Type 055
destroyers for China's People's Liberation Army Navy (PLAN).
At the Jiangnan Changxingdao shipyard near Shanghai, where construction of
the lead ship of the class commenced in late 2014, Hull 1 appears to have
all the modules in place and most of the modules for Hull 2 are in position.
In late 2016, hu... 阅读全帖 |
|
l****z
发帖数: 29846 | 24 人造全球暖化歇斯底里最后花光了其他人的钱：荷兰无力补贴“绿色能源”风力发电了
，去年砸进去45亿欧元
(Reuters) - When the Netherlands built its first sea-based wind turbines in
2006, they were seen as symbols of a greener future.
Towering over the waves of the North Sea like an army of giants, blades
whipping through the wind, the turbines were the country's best hope to curb
carbon emissions and meet growing demand for electricity.
The 36 turbines -- each one the height of a 30-storey building -- produce
enough electricity to meet the needs of... 阅读全帖 |
|
l******h
发帖数: 2 | 25 Highly reputational company with very competitive compensation for all
positions.
Please send in your resume and position/positions you like to apply to my
email address below.
h*******[email protected]
All resumes will be deliver to hiring manager directly. Act fast!
Thanks!
Silicon Engineering Group
Sr. Physical Design Timing Engineer
Timing (STA) Manager
Senior Physical Design Engineer
CAD Manager - Front-End Design and Verification
Sr. CAD Engineer - Place & Route / Physical Design Engineer
Sr. CA... 阅读全帖 |
|
n**********o
发帖数: 1016 | 26 https://www.nae.edu/MediaRoom/178117.aspx
Abadi, Martín, principal scientist, Google Inc., Palo Alto, Calif. For
contributions to the formal theory of computer security.
Abrahamson, Norman A., chief engineering seismologist, Pacific Gas &
Electric Co., Piedmont, Calif. For contributions to seismic hazard
assessment and for leadership in engineering seismology and earthquake
engineering.
Adams, Robert W., senior fellow, Analog Devices Inc., Acton, Mass. For
contributions to digital storage and... 阅读全帖 |
|
p*****e
发帖数: 16417 | 27 ☆─────────────────────────────────────☆
Grid (格子) 于 (Mon Dec 20 22:47:15 2010, 美东) 提到:
Macy's买的高压锅。今天炸了，天花板上面都是东西。吓了一大跳。
请问是应该找Macy's还是生产商负责呢？谢谢大家指教了。
☆─────────────────────────────────────☆
Rodimus (变叔- 知足常乐) 于 (Mon Dec 20 22:52:23 2010, 美东) 提到:
晕。。。。。火上烧的那种？ Macy应该不管， 拍些照片，
或许能告厂家吧。。。
☆─────────────────────────────────────☆
linger0223 (花非花) 于 (Mon Dec 20 22:52:30 2010, 美东) 提到:
有没有受伤。。。
恐怖啊。。。
有没有用它在做粥。。。不是自动控制用来做可能会堵塞气孔的东西的很危险。。。
当然MM可能没有做那些危险的东西啦。。。
去找MACYS问问先。。。他们服务都还是很贴心的。。。... 阅读全帖 |
|
K******g
发帖数: 1870 | 28 我的代码
N*M //grids number
int grid[N][M]; //0: the grid cannot be passed; 1: can be passed
(N-1, M-1)
int isVisited[N][M]; //initialized to 0
int stepGrid(int n, int m)
{
if(isVisited[n][m] == 1) return 0;
if(n == 0 && m == 0)
{
return 1;
}
if(grid[n][m] == 0) return 0;
isVisited[n][m] = 1;
int rtn1, rtn2, rtn3, rtn4;
rtn3 = stepGrid(n+1, m);
rtn4 = stepGrid(n, m+1);//第一次写的时候没有考虑n+1和m+1
if(n!=0) rtn1 = stepGrid(n-1, m);
if(m!=0) rtn2 =stepGrid(n |
|
s*****t
发帖数: 737 | 29 这个算法效率不行啊。
很多重复计算,如:
stepGrid(n+1,m)
stepGrid(n-1,m)
每次都要重复计算。
最好改成非递归
我的代码
N*M //grids number
int grid[N][M]; //0: the grid cannot be passed; 1: can be passed
(N-1, M-1)
int isVisited[N][M]; //initialized to 0
int stepGrid(int n, int m)
{
if(isVisited[n][m] == 1) return 0;
if(n == 0 && m == 0)
{
return 1;
}
if(grid[n][m] == 0) return 0;
isVisited[n][m] = 1;
int rtn1, rtn2, rtn3, rtn4;
rtn3 = stepGrid(n+1, m);
rtn4 = stepGrid(n, m+1);//第一次写的时候没有考虑n+1 |
|
b****g
发帖数: 192 | 30 你楼上的意思是说访问过的grid就不能在访问了，所以每个grid就被使用一次。你的理
解可能是从每个grid向四个方向递归访问，如果不考虑访问过的不再访问，那确实是4^
N。但是你楼上使用了剪枝，所以时间复杂度会下降，所以每个grid最多被用一次，所
以“对每个起始点来说，顶多遍历整个range每个点一次“。你如果不问这个问题我也
意识不到剪枝能把复杂度从指数降到多项式。
with |
|
c********w
发帖数: 2438 | 31 Find the length of the longest non-decreasing sequence through adjacent, non
-repeating cells (including diagonals) in a rectangular grid of numbers in a
language of your choice. The solution should handle grids of arbitrary
width and height.
For example, in the following grid, one legal path (though not the longest)
that could be traced is 0->3->7->9 and its length would be 4.
8 2 4
0 7 1
3 7 9
The path can only connect adjacent locations (you could not connect 8 -> 9).
The longest possible seq... 阅读全帖 |
|
e***g
发帖数: 57 | 32 The second question says "find a grid point", which means the answer is any
point on the grid. 2-D Manhattan distance is simply the sum of the x
dimension distance and the y dimension distance. So to prove the median
point is the answer, we only need to prove the 1-D case. Prove as follows:
1. In 1-D grid, assume the number of nodes at both sides of the median point
is N (N>=0), the number of nodes on the median point is M (M>=0).
2. If we choose a grid point at the right/left of the median poin... 阅读全帖 |
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h*******8
发帖数: 29 | 33 跪了，上面经，估计是有一轮算法不smooth。本人fresh phd。anyway，反正要从别家
鸟。
都不难，欢迎大家讨论
第一轮：聊research，最后问了一题，
write a function f(x), so that f(x) returns true with x% probability。
第二轮：Given k sorted linked list, n elements in total, merge them into one
sorted linked list。
经典题吧，但是居然在复杂度上卡了一下，给出的 log(k)*n的recursion解法。follow
up是如果不允许用recursion如何达到log(k)*n。follow up也没答好，提示是可以用
heap。
中午吃饭
第三轮：convert a binary search tree into sorted double-linked list。
implement memcpy.
第四轮：System design。
Given a location (a coordinate), ret... 阅读全帖 |
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p*****e
发帖数: 310 | 34 【 以下文字转载自 Returnee 讨论区 】
发信人: pinacle (大石头), 信区: Returnee
标 题: IBM Research- China hiring postion: Analytics and optimization research in innovational industry app
关键字: IBM,hiring
发信站: BBS 未名空间站 (Fri Sep 21 06:11:28 2012, 美东)
代发贴：
************************************************************************
Pls send your resume to s******[email protected] or b***[email protected] if you are
interested in this position.
************************************************************************
Job Scope: Analyt... 阅读全帖 |
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l******h
发帖数: 2 | 35 Highly reputational company with very competitive compensation for all
positions.
Please send in your resume and position/positions you like to apply to my
email address below.
h*******[email protected]
All resumes will be deliver to hiring manager directly. Act fast!
Thanks!
Silicon Engineering Group
Sr. Physical Design Timing Engineer
Timing (STA) Manager
Senior Physical Design Engineer
CAD Manager - Front-End Design and Verification
Sr. CAD Engineer - Place & Route / Physical Design Engineer
Sr. CA... 阅读全帖 |
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S******6
发帖数: 3138 | 36 先回答前面人问题：板子等等都是 Solar City 负责免费维护。
这里有篇文章鼓励自己买，而不是租太阳能系统 （Solar City 实际上是租你 20 年）：
Why Lease Solar for Your Home When You Can Buy?
Leasing a solar electric system for your home is simply not a good idea,
despite what mega-buck advertising by huge corporate interests are saying to
the contrary. We do not recommend it.
We do not recommend solar leasing because:
A solar lease is just one more financial “tool” that is complex enough
that you can’t quite see what the real cost of it is. In 2009, gr... 阅读全帖 |
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p*****e
发帖数: 310 | 37 代发贴：
************************************************************************
Pls send your resume to s******[email protected] or b***[email protected] if you are
interested in this position.
************************************************************************
Job Scope: Analytics and optimization research in innovational industry
applications
Work Location: Beijing, Shanghai
Job Description: The job offers an opportunity to apply advanced analytics/
optimization/simulation technology in key industri... 阅读全帖 |
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S**C
发帖数: 2964 | 38 这个就是安全阀啊，stabilize the grid for ***short*** period of time, so the
system can bring the grid back on its way to recovery using fossil fuel
fired power plant.
你觉得Grid在一个500MW的电站Fail的时候，靠着一个129 MWHr的大电池组就能够糊弄
过去了？ 这就和工厂里的水塔类似，断电的时候不至于冷却水一下就没了，还可以靠
重力，然后启动备用电源。
https://qz.com/1165314/elon-musks-giant-tesla-battery-in-australia-proves-it
-can-power-the-grid-when-coal-plants-fail/
and |
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C*****1
发帖数: 746 | 39 Welch-Dickey Loop Trail Description
Trail descriptions are the main feature of this web site. Every trail
description was written by someone who has actually hiked it; we do not just
copy descriptions from elsewhere. The description is often reviewed either
by someone else who has hiked it for comments or by someone who has never
been there to see if it is too confusing. Hence authorship is usually a
group effort and the author is usually not listed. Contributed descriptions
may be credited to p... 阅读全帖 |
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S*******s
发帖数: 10098 | 40 今天我们也收到了这样的信。 其实这个信是从Dominion发给我们的， 他们把信封窗口
设计得好像是从NStar发给他们顾客的样子，有点以假乱真的效果。
至于为什么他们要宣传一个更便宜的发电费，这个和麻省最近的Enegy Deregulation政
策有关。理解不对的地方欢迎大家指正。
按照我的考古， 这个行业的利润是被输电寡头National Grid, NSTAR 垄断了。 这2个
公司只是负责输送和服务，卖给我们这些retail直接用户。他们自己也发电的那部分business因为Deregulation被迫卖掉。 Enegy Deregulation政策allow其他风力发电厂，太阳能发电厂，烧煤发电厂的产出在市场上自由拍卖竞价。
也就是说National Grid, NSTAR 只能买他们的服务了。 他们是那种铺线offer输送服务的公司，由于他们花了大钱投资输送服务Infrastructure, 没有后来者愿意花这么多钱重复投资在这些设施上面， 因此这几个先头公司就便成“自然垄断”寡头。 他们收手中掌握了这些直接到达用户家里的设施，这使他们独具了倒卖各种energy sup... 阅读全帖 |
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k**t
发帖数: 1108 | 41 除了撒哈拉，很多地方搞光电就是扯淡。西班牙投了几亿欧元，打水漂了。
我在不久前和搞核电的工程师聊过，他说如果人们同意继续核电，他们会有饭吃。如果
人们不同意，那么结束运行和拆除核电设施也要持续几十年，足够核电工程师吃得饱饱
的，核电行业怎么样都不会挨饿。
你再 google 一下有多少公司在进军 smart grid，市场份额才多大？多数人都在炒作
概念，但是多数国家电能的主力依然是传统电力公司。smart grid 的应用还主要在
distribution network 阶段，虽然 transmission grid 也在引用 smart grid，但是
那主要是大公司垄断，占据利润大头。 |
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D****e
发帖数: 1122 | 42 899 加元,这个价格不知道赤壁带够的人如何想
http://www.sonyalpharumors.com/sr5-rx100miii-priced-at-899-cana
摘要：
Optical Zoom : 2.9x (Optical Zoom during movie recording)
Lens Type : Carl Zeiss® Vario-Sonnar T*
Aperture (Max.) : F1.8(W)-2.8(T)
Viewfinder
Type : 0.39″ SVGA electronic viewfinder(OLED), 1,440,000dots
Magnification : Approx. 0.59x with 50mm lens at infinity, -1m1(diopter) (
35mm equiv.)
－－－－－－－－－
完整
Software
Operating System Compatibility : PlayMemories Home: Windows® XP SP3,
Windows Vista... 阅读全帖 |
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d*b
发帖数: 21830 | 44 都是些无足轻重的玩意，看看世界上最大的DOE grid, 新增的grid,基本都是redhat的
天下了。
你说的这些玩意连一个大学的grid都比不上，比如mit grid。
0 |
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c*r
发帖数: 278 | 45
HA在grid上也可以实现. 其实cluster和grid在本质上是一样的.
N1 Grid Engine is the new release of Sun Grid Engine Enterprise Edition.
HTC (High Throughput Computing)? |
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b*****i
发帖数: 8 | 46 Grid computing 很超前吗？感觉都落伍了啊，一些大公司也不提grid了，我所了解的
grid都是基于web service的grid，所以也没太多新意。 |
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o**n
发帖数: 1249 | 47 借机问一个问题。我有一个较大的二维矩阵，是(x,y)坐标矩阵，float type，x,y都没
有规则顺序。我再建一个x,y mesh grid的矩阵，间距是均匀的或有一定规律比如线性
增加等，要把前面那个乱的(x,y)矩阵放入grid里，会有多个(x,y)落在同一个grid的情
况，把每个grid中有的(x,y)在原矩阵中的行列index记录下来。其实就是个二维monte
carlo的东西。我现在也是用loop硬来，目前用matlab，用C肯定快一些。数组也不是特
别大，run一次大概几分钟时间，但我要做很多次这个事情，想请教大家更好的方法。 |
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n**********E
发帖数: 157 | 48 I am sorry that the original post is misleading. Please see the detailed description of the problem below.
They are a lot of floating point calculation in the code.
Basically, i am doing an interpolation from a position to the
closest grid point. It is a 1d problem.
The domain is from (-L, L) and N is the number of grid point at a half
domain.
The grid size is dv, where dv = L/N; The grid is cell centered (-0.5
in the code below).
L, dv are declared to be double type and N to be integer type.
Be |
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d********g
发帖数: 10550 | 49 那你还不如说算法不就是平时上课的东西么，不一样大部分人挂？hands-on和理论是完
全不同的，做做就知道了，细节太多
也有蛋疼的startup考数学题。下面这题我是没做出来，不过也让我on-site了：
Chef Claudio loves to have food specials but likes knowing what each day's
specials are to be a challenge. So, he assigns a random 3 digit alphanumeric
code to each of the 250 items he might make and publishes this list. Each
day, he chooses a set of five items to make and uses a grid with a square
for each of the 36 possible letters/numbers to let guests know if a
particular item they want is ... 阅读全帖 |
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a******s
发帖数: 232 | 50 以前都是用的fixed grid,现在需要用adaptive grid,
但是没什么概念,谁有什么入门的材料什么的,基本
概念什么的我知道,但是需要知道怎么操作的.
只是structured grid,也就是adaptive structured
grid,在有些文献上叫adaptive mesh refinement(AMR).
thx a lot |
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