s*****g
发帖数: 5159 | 1 I think you already have a decision, others opinion will not matter much.
Although you want go with the Romanian guy, you will regret that you did not
chose the American guy after years.
chanllenge学
，n |
|
z*****n
发帖数: 7639 | 2 碰到过的罗马尼亚人中多数都聪明绝顶，数学巨牛。
当然了，学术圈里面，数学好的好混。
chanllenge学
，n |
|
s****g
发帖数: 82 | 3 我见过一个极其tough
chanllenge学
，n |
|
y****w
发帖数: 3747 | 4 你能要来funding么，有的话咱可以host sql chanllenge。或者交1个包子参加，才能
看到别人的答案，最终最佳解法等。or等2个星期。 |
|
h*********r
发帖数: 10182 | 5 现在的机箱没usb3不行。
用rosewill 的chanllenger-u3吧，比这个好。 |
|
t**********1
发帖数: 550 | 6 来自主题: Programming版 - 代码开源了 不光是chanllenge。而是连续主动挑衅污言秽语人身攻击两年多。
你要怎么借鉴？这个算法证明了实时抢票可以做到无限scalable。
至于你想优化座位之类的。那是另外的问题。可以和实时抢票并存的。 |
|
w*********i
发帖数: 658 | 7 估计会计版上大多都是在会计师事务所工作过多年的前辈了。我还是MAcc学生，会计最
大优点就是比理工科简单，好入门，工作稳定。工资低一点也可以理解。毕竟不是很多
人都适合从事高科技的。但是前辈们没留意落地生根版，对于国际学生来讲，会计是很
难拿绿卡的。至少现在EB2都不行了，而且EB2未来很可能需要排期到10年以上。
至少从这个角度讲，如果我是男生，我一定不会选会计。我更喜欢金融或理工科，虽然
难，但是更chanllenge,更beneficial，还好拿绿卡（金融除外），何乐不为？ |
|
l****8
发帖数: 271 | 8 接下来要准备ethics, 据说也是个chanllenge. 有哪位一起准备交流的吗？
请联系我。 谢谢 |
|
h*******o
发帖数: 4884 | 9 dietary supplement当然属于FDA监管
只不过不再CDER或者CBER 下面,而是follow 了 DSHEA而已
而且dietary supplement 的manufacturer需要ensure safety
如果里面有new ingredient，manufacturer必须通知FDA，而且必须给出reasonable
explanation 为什么这个new ingredient 是安全的
以前FDA对这个部分管理比较松，目前FDA正在迅速的加强dietary supplement的管理，
前年开始要求cGMP,未来5年，dietary supplement必将是一个监管重点，而且是有很大
的盈利市场
至于做天然产物，只能说目前骗子太多，但不能说天然产物本身就不靠谱
大药厂放弃天然产物的原因很重要的一部分是因为有dietary supplement的竞争以及
potential patent void issue，换个multibillion出来的药，专利很容易就被
chanllenge
药厂也不是傻子，当然往简单容易赚钱，风险相对小的地方转
版主要考虑一下这 |
|
b*n
发帖数: 66 | 10 我曾做了4年的土木工程(Geotech),也拿了PE, 但总觉得自己不喜欢,所以现在在读商学院了.
我的感受是一定要热爱这个行业, 否则很难做下去或者就是混日子了. 美国虽然没有国内有那么多工程, 但每年FHWA,班EPA 和各洲DOT还是有很多的投资在基础建设上,There are still lots of chanllenges ahead as long as you love and enjoy the civil engineeing. |
|
d****a
发帖数: 23 | 11 It is an 3D elliptic problem with periodic boundary conditions in lateral
boundaries and fixed top and bottom boundary condtions. After discretizing
by finite difference method, I get a big coefficient matrix with 39 nonzero
elements in each row. The matrix has dimension about 75,0000. Now the
problem is to solve the sparse linear system. However, this matrix elements
have a large numerical range, spaning 10 orders of magnitude. It is
nonsymmetric, not diagonally dominant, and not positive defin |
|
b***e
发帖数: 38 | 12 Perhaps you need to go back to physics or work on basis functions to make
the matrix better conditioned.
nonzero
elements
Sparse |
|
s**i
发帖数: 381 | 13 exactly.
Try to make it s.p.d
Or maybe implicit scheme is not a good idea for this problem at all. |
|
d****a
发帖数: 23 | 14 Thank you guys for the input.
I can make the matrix better scaled such that the numerical range falling
into 2 orders of magnitude. Actually it is a fluid mechanic problem seeking
for the steady state internal wave solutions. My solver gives solutions for
some idealized cases, like giving a constant flow field. If the flow is zero
, it become simply a 3D Laplace problem, which is easy to solve.
Talking about make it symmetric, positive definitive ...
The wave operator itself was actually singula |
|
b***e
发帖数: 38 | 15 Here are my 2 cents although I am not working on fluid mechnics.
On the numerical side, try preconditioned GMRES if Gaussian elimination with
pivoting does not fail.
If the previous does not work, check out whether the system of equations is
diagonalizable.
Finally, if this is an eigenvalue problem, try to solve it as an eigenvalue
problem.
good luck.
seeking
for
zero |
|
w****z
发帖数: 1167 | 16 今天是在PA (我今年工作的学校 )的最后一天.
还记得刚到这个学校开学一个月,在版上哭诉痛苦的教学经历,也麻烦了版主不少,没想
到这么快一年就过去了,学校的同事都说是 we survived.
上半年真的是很痛苦,几次想quit,但是咬咬牙还是挺过去了,学校的校长和同事,大家都
互相支持互相帮助,寒假过后,一些特别chanllenging 的学生走了,学校有了不少改观,
我也渐渐的发现学生的可爱之处.但是学校仍然经常发生的暴力,和时常失控的课堂,有
时是在很关键的时候发生,也让我坚定了要走的决心.
下半年陆续的拿到Phd 的offer, 学校希望我留下,我告诉他们我要去读博士,学校表示
理解.然后拿到很好的新工作的offer, H1b 名额用光,只好放弃, 又拿到新offer,一个
perfect 的机会,开始着手申请H1b.申请过程中也多是是波折不算和难熬的等待.
今天是我first year teaching的最后一天,感谢PA (我学校部分名字的缩写)在我去年8
月底学校纷纷开学了都没有工作的情况下,出人意料的给了我一个offer, 感谢PA让我在
一年后变得strong,感谢 |
|
S****e
发帖数: 1063 | 17
多？
The 99.3% efficient PFC on their paper is at 3.2 KW, which translate to over
22W of system loss. I did not see a efficiency vs. output current plot from
the paper, but my guess is at 20% load the efficiency will drop
significantly.
99.3% is pretty impressive number, however it would not be nearly as
shocking as 150W, 20%-100%, 97%+ efficiency, which translate to a 0.9W
system loss. There are many chanllenges involves in getting high efficiency at a small portion of the rated power, things li |
|
gr
发帖数: 2958 | 18 99.3% is pretty impressive number, however it would not be nearly as
shocking as 150W, 20%-100%, 97%+ efficiency, which translate to a 0.9W
system loss.
嗯，说了是没考虑gate drive和control
There are many chanllenges involves in getting high efficiency at a small
portion of the rated power, things like minimum load, deriving power to the
controller and gate driver, control and drive power requirements would all
come into play. Of course at high loads it will be much easier to archieve
97% efficiency, I ha |
|
S****e
发帖数: 1063 | 19 1. higher power level does not make it easier when you use the same power
meter, it maybe easier when you start doing thermal measurements.
2. different situations has different chanllenges, I never said it's
impossible, but not trivial either.
3. If you cannot garuntee the accuracy of the measurement, then nothing is
certains. |
|
gr
发帖数: 2958 | 20 嗯，是的，小功率，乃至微功率做高效率非常的chanllenge。
不过你说的测量的问题确实是个问题，下次我测效率的时候，也要注意一下。 |
|
r********r
发帖数: 677 | 21 https://www.littleboxchallenge.com/
相信很多大拿都听过这事了，我逆变器做过但是只是民用级别，这种高大上的设计有没
有大拿可以发表两句分享一下看法？ 我感觉是这玩意大公司看不上，中小型公司正儿
八经的搞项目就算赢了也不一定能回本，就微型公司或学校可能有点兴趣，个人搞的话
仪器装备不齐活基本没戏。大家怎么看？有报名参加的吗？ |
|
l***g
发帖数: 1035 | 22 Useless.
1m is not enough to even prototype.
And the single phase dc to ac is a bad usage of such technology. Downstream
appliances are far less efficient. |
|
|
g******u
发帖数: 3060 | 24 难度很大，回报概率太小。
好在他还有些funding支持，据说几个牛校都会派学生来做。
这个东西就是来推GaN和SiC芯片的，当然如果不惜工本那也可以做得好。
估计最后只有学校会去做，个别厉害的consultant老头也有可能。 |
|
b*****r
发帖数: 97 | 25 这个challenge不是真正的pv inverter，只是single stage的inverter而已，没有提具
体的效率和体积要求，就是众多方案比，最后最好的那个获奖。 |
|
g*******l
发帖数: 77 | 26 这个问题应该比较chanllenging,希望高手指点一下，多谢。 |
|
a***h
发帖数: 1222 | 27 If you are doing projects for goverment, it is better to use free software
from federal agencies like USGS, EPA, USDA, or USACE. Or somebody may
chanllenge the credibility of the software you used. Eventhough the
comercial software may have better functionalities than the free software. |
|
a*****a
发帖数: 1038 | 28 Safe answer for looking for new job opportunities
seek a job for chanllenging youself and utilizing your strength and skills..
Safe answer for the salary
First of all, salary is not the primary factor for me to make a move. I
mainly seek a job for me to well utilize my knowledge and skills and achieve
my long term career goal. However, I believe my future employer will also
treat its employee well and pay the competitve salary to match our
experience and skills. |
|
c******i
发帖数: 2427 | 29 Studying the law is one of the chanllenging things to do, especially for
foreigners. I wonder how can you get a J.D. as a part-time law student?
BTW, as a client, I wouldn't hire an attoney who got his/her J.D. as a part-
time student. |
|
f****e
发帖数: 260 | 30 目前面临一个车祸的官司，我是被告方，原告现在向我起诉，我已经他们起诉我的材料
交到的我自己的保险公司（geico），geico已经指定了一名辩护律师。律师已着手准备
应诉了，今天收到我的geico律师的一封信说：The plaintiff was required to serve
the complaint upon you in one of serveral different ways. There is a
question of whether this was done properly. If you want, we can challenge
the plaintiff on the manner in which you were served. Unfortunately, this
will require you to come to Court. Even if we win, the plaintiff can start
the lawsuit all over and re-serve you. The plaintiff has three y |
|
A**t
发帖数: 458 | 31 应该是说原告需要在规定时间内，以合乎相关规定的方式，通知你你被起诉了。通常是
交给你一份complaint和summons.这个手续叫service.
如果原告没有按规矩来，你可以以此为理由，要求法院dismiss这个案子。
但是按照你律师的说法，被dismiss后原告可以从头再来。
个人觉得，律师就是告诉你有这么个选择，免得事后被说没有尽到责任。
serve |
|
f****e
发帖数: 260 | 32 谢谢楼上回复,貌似很博学啊.我又发了一个车祸详细经过的贴，麻烦老大看看，给个建
议。 |
|
t******l
发帖数: 3060 | 33 来自主题: Macromolecules版 - 高分子科学 这些project都很chanllenging,对合成的技巧要求很高.
还是那个问题,
how to synthesize structure well-defined oligmers and polymers...
现有的living polymerization是远远不够的,局限性很大. |
|
f**********e
发帖数: 236 | 34 Can't agree more. The fancy staff in nano-science has been done a lot. But the
real applications are still far away. An interesting thing is people know
little about how dangerous these materials are to humans. The first account of
using QDs for bio-labelling showed up in 1998. But until this year, there is
the first paper dealing with the cyctotoxicity of them.
The creatation of nanometer-sized material based devices is also really tough,
if not harder than biological application. However, if t |
|
c*s
发帖数: 2145 | 35 thanks for your comment from you guys. And I learned sth.
The paper you mentioned is by Warren Chan, if I am correct.
After the 2 landmark papers in 1998, there were little progress in this area,
using QDs for bio-labelling. as I mentioned in my previous post, the two
papers in nature technology recently should be sth breakthrough.
Qds have bring ppl so much pleasure so that it will be a really pity if it
only be a toy.
on the other hand, I agree with you, I have a feeling that nanodevice is eve |
|
a***n
发帖数: 578 | 36 read more pls.
the
of
tough,
not
be |
|
c*s
发帖数: 2145 | 37 hehe, but how much is enough?
I have a feeling that it seems few people can handle this area on his own, it
covers so many desciplines
account
is
works,
can
the |
|
a***n
发帖数: 578 | 38 NPs have been widely used in industry right now.
but nano-device or QD may be dead end, not sure.
it
But
know
there
is |
|
c*s
发帖数: 2145 | 39 as I think, it is hard to say...
QDs have many fold applications, although may not be so important...
what come to my mind instantly is it can be used as sensors... after all, its
optics is closely related to their enviroment.
really
It
they
of |
|
f**********e
发帖数: 236 | 40 What's your point? Am I wrong somewhere? Sorry I did not cite your papers, but
I really do not know where they are.
Another comment is the "nano" I talked about is in the 2-10 nm range, 20 nm at
top, just because the quantum effect is effective only in that or even smaller
range. Not those several 100 "nano"particles.
account
is
works,
can
the |
|
f**********e
发帖数: 236 | 41
it
Good point! You can see some successful collabrations, such as Bawendi and
Mattoussi. Although now Mattoussi makes his own DQs. |
|
a***n
发帖数: 578 | 42 you are just misleading ppl here. anyway, I won't pursuade your thinking.
but
at
smaller
But
know
there
is |
|
P******e
发帖数: 344 | 43 Cree Interveiw Experience
Glassdoor上是说很变态的。实际上也就是Tough了一点。
Phone Interview 等于啥都没问。
On site interview 旅途糟糕透顶，前一个晚上就睡了2个小时。
再前前一个晚上睡了4个小时，所以面试当天状态很差。
下面是我的记录
1. presentation
list all the details, audience can read from what you put on,
you do not need read every thing presented.
a big picture, balance between previous and present
details, direct details, easy to understand
everything list should cause no problem, and understand all
objective clear, whys,
2. 1-1 interview
prepare questi... 阅读全帖 |
|
U******u
发帖数: 5829 | 44 cong!
now, u need tons time to prepare for your critical battle which will
determine your fate and future soon.
It's a very serious and critical, chanllenging to almost all CMGs, I don't
believe u r well-prepared yet.
Why r u still join those trash mouth-water???
U think u know everything on IV already???
Now u waste your time, and u will lose the battle later, for sure!!!!! |
|
k***i
发帖数: 60 | 45 Appreciate your response, Dreamchaser. 35+ MCAT sounds like a chanllenge,
but that is definitely something that I am willing to spend the time and
effort to achieve. Thanks again for your time
you
quite
bit
this
solid |
|
h***y
发帖数: 834 | 46 ☆─────────────────────────────────────☆
toutuanzi (rr) 于 (Fri Sep 3 14:54:17 2010, 美东) 提到:
Got two rejections already: Guthrie, PA (internal medicine) and Capital
Health (FP)
☆─────────────────────────────────────☆
yeastmito (小猪) 于 (Fri Sep 3 15:14:14 2010, 美东) 提到:
我也受到一个据信了
Guthrie, PA (internal medicine
☆─────────────────────────────────────☆
rr6262789 (盘片) 于 (Fri Sep 3 15:15:38 2010, 美东) 提到:
Rejection: Guthrie (IM), PA
Hey toutuanzi, can you highlight your post title so that... 阅读全帖 |
|
E*****8
发帖数: 30 | 47 10AM邮箱收到熟悉的成绩通知单，心跳立刻狂飙到120。终于过了！回想这一年多的经
历，没有太多惊喜，而更多的是百感交集。潜水多年，把我的经验教训写下来，希望对
后面的考生有帮助。
我于去年4月中旬改题前约了PHILLY 考场， 一来离家近，二来其他考区合适时间点已
经订满。考前去了NJ 2天班，也跟小组练了近一个月。从平时工作和老美交流中感觉语
感和表达都不错，也不乏听到赞美之音。考前担心更多的是记不住PROTOCOL，漏太多问
题。考时有点小紧张，但总体觉得还成，一切照着诸多考经描述中进行。记得有个SP
甚至还在我离开前微笑着说"I APPRECIATE IT"。考后如火如荼地进行着OB。结果FAIL
，整个计划打乱，无法再约上MATCH 前出成绩的考试时间。可以想象当时的愤怒，郁闷
甚至想到申诉。前段时间看到一帖就和我的情况非常相近。我也FAIL在SEP上，SEP平均
点就落在BORDERLINE BAR左缘上。看到那么多擦边过的同学，我没有那么幸运。考试由
12个SP 评定，评估结果应该是可信的。一切静下来后开始好好总结问题出在哪里。
1. 我们CMG 的理论基本功大多扎实，I... 阅读全帖 |
|
w******z
发帖数: 1872 | 48 这两天又一个assignment， 病人fresh LVAD post op day 2, drive line 在白天PT的
时候被意外拽了一下，开始出血。我接管的时候，出血越见严重。这些只是表面症状。
几小时后病人出现呼吸加快，但血氧还正常，没有用氧气。MAP 没有明显降低。 报告
护士胸口疼痛，有压力，一半常见在开胸手术后几天。 半夜，LVAD 度数异常， flow
正常，但是pulse index 开始下降。 和一个老护士讨论， 怀疑是cardiac tamponade.
病人原计划转stepdown in couple days， PA 和 IJ 都已remove， 只有PICC。 我建
议NP和MD 胸片， PICC CVP （for reference only）和ABG。结果CVP升高，lactate升
高，尿量极具降低，肾功能急剧下降，胸片显示巨大的心脏轮廓的尺寸（baseline，
病人有个大心脏）。 同时chest tube output也下降了。NP和MD不appreciate这些异常
结果，做了一些不痛不痒的fluid chanllenge 针对 下降的LVA... 阅读全帖 |
|
h*******o
发帖数: 4884 | 49 thearetically, physician can almost use anything they have access to and FDA
has no authority over their practices.
of course, no physician will risk their career over something they have no
confidence.
As for combination drugs, of course fDA has guidelines. this is true for
drugs and for drug/device combos, as long as the IND/NDA is clear about
their mechanisms of action or active ingredients.
again, the biggest chanllenge for TCM is QA and GMP, not their synergistic
mechanism of action.
as for... 阅读全帖 |
|
o****o
发帖数: 8077 | 50 one small data manipulation problem here, don't know if my solution is the
best, or maybe this one is not chanllenge for Cow ppl. anyway, it is small
enough, though.
Task: a MxM cross table, want to find the corresponding column name with the
max value in each row. I am trying my best to avoid
eg. xTab: |
|
