l***o
发帖数: 6 | 1 Hi there,
Sorry I can't input Chinese right now.
Please help me with the following question. Thank you so much!
To solve a problem, I have two objectives:
1. choose xi to max f(xi),
2. choose xi to min g(xi).
where f(x) and g(x) are two functions of x.
Since there are two objectives, I want to combine them to one objective
function to ease the problem.
Two possible choices of the objective functions are:
1. choose xi to max[f(xi) - g(xi)],
2. choose xi to max[ f(xi)/g(xi) ].
My question is: will |
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j****8
发帖数: 1 | 2 Hi,
I have a probability question as follows:
x1, x2, ... ,xn are n indepedent random variables. if y1 is the largest value
of x1 to xn, y2 is the second largest vaule of x1 to xn, ..., yn is the
minimum value of x1 to xn. Obviously, y1, y2, ..., yn are n random vaibles as
well. The question is:
Are y1, y2, ..., yn indepedent to each other? How to prove it?
Thanks a lot!
Jeff |
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r****y
发帖数: 1437 | 3 Friend asked me this question and I have no clue how to do it
A set of numbers, sqrt(1), sqrt(2), ..., sqrt(50)
You divide these 50 numbers into two group, the sum of the
first group is sum1, the sum of the second group is sum2, let
dsum = abs(sum1 - sum2)
question, how you divide these 50 numbers to make dsum as small as
possible?
The gut is dsum could be very small, -> 0. But no idea how to prove
and how to find those two sets. Hehe.
|
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A****e
发帖数: 44 | 4 I guess my subject was a little bit misleading --- please read the question
carefully and the question is not that standard!
It assumes nothing on f_n and only gives the condition that f_n(x_n) -> f,
and ask to prove that f is continuous. There is NO uniform continuity
involved here. |
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j**********7
发帖数: 4 | 5 An interview question I met.
"Consider a matrix $J$. every eigenvalue of $J$ has positive real part.
Now let us consider infinite product of (1-J/n). Do you think this
infinite product converges? and how about the converge rate?"
Is there anyone can give some advice. thanks! |
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y**c
发帖数: 133 | 6 Is there anybody can help me to solve this question:
A sphere of radius=R0 has gas in it;
There has a potential V(R)=V0*exp[-(R-R0)/a].
The atoms are colliding in the sphere, and the potential acts on the particles.
The question is:
How to get the Fourier transform of V(t), i.e.
Integral(from -inf to +inf) [V(t)*V(t+tau)]*exp(-i omega t) d tau
you may consider potential is much smaller than the kinematic energy, if otherwise too difficult to solve.
Thank you! |
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H****7
发帖数: 159 | 7 My question is a probability question.
have |
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D**u
发帖数: 204 | 8 【 以下文字转载自 Quant 讨论区 】
发信人: DuGu (火工头陀), 信区: Quant
标 题: 来一道题(由 BT question 而想)
发信站: BBS 未名空间站 (Sat Mar 6 14:46:26 2010, 美东)
On a 2-dim plane, F is a (real number valued) function on each polygon area
P. We also know that if P is the union of 2 disjoint polygon areas P1 and P2
, then
F(P) = F(P1) + F(P2).
Question: if for every rectangle D (no need to be parallel to x-y axis) we
have F(D) = 0, does that imply that F(P) = 0 for every polygon area P? |
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F**S
发帖数: 13 | 9 I am embarrassed to ask such elementary questions but they have bothered me
like a bone in my throat for quite a while. Please be so kind to enlighten
me...
The questions are centered closely about infinite dimensionality:
How exactly to see that a mapping space is infinite dimensional? To be
specific, take the simplest example of the vector space, C(R, R), of
continuous functions from R to R, where R stands for the space of real
numbers. The statement must be obvious since books I have consulte... 阅读全帖 |
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n*********3
发帖数: 534 | 10 Thanks, that is interesting.
COme to think about it, unlike Lookacar, I thought I would never be good
enough for bring a mathematician, pure math mathematician, so I choose to do
something else early on. But quite often I would look at math a little, and
found them interesting, still.
It is quite puzzling whether lookacar is really good or just really shit. I
vote really good for now. I think we should respect that everyone here does
not want to be disclosed of his true identity in real life. Bu... 阅读全帖 |
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c***g
发帖数: 357 | 11 出售PE 2008 sample questions和6 minutes solution,mechanical design部分有笔记
，HVAC和thermal部分很干净，价格站内。个人认为2008年模拟题更接近真题。同时三
本现版ncees官网卖的sample questions总共30$甩卖，PE reference manual不卖，请
勿询价。在德州和oklahoma地区Hal,SLB,NOV,BHI工作的包邮。 |
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u*****8
发帖数: 15 | 12 Can anyone help me on the following questions? Thank you very much!
1 如果SP戴隐性眼镜(我自己不戴，不知怎么判断病人戴了没有），做眼底检查时，要
怎么说？要让病人取出吗？检查完后再问病人是否愿意戴回去？可以戴着隐性眼镜做眼
底镜检查吗？记得有个帖子提到做这个检查时，病人自己说他戴着隐性眼镜。不知后来
是这么处理的。
个人认为病人不会愿意这样做，否则一天12个检查下来，病人哪受得了？：）
2 gown是长袖还是短袖的？如果是长袖的，做上肢DTR要病人卷起袖子怎么说？
3 gown是前面系带子还是后面（费城）？如果是后面，听心肺时，是让病人向上拉（可
以用drape盖腹部），还是向下脱（前胸后背都露出来了，需要遮盖一下吗？）。我看
的录像是向下脱，不给任何遮盖。
4 病人坐着时，脚踏板是收回去的还是一直伸在外面（给病人放脚）？或者只是病人上
下床时拉出来用一下就推回去？
5 大家是饭后刷牙还是漱口+口香糖？记得failedcsonce说考试中心建议大家带牙刷。
：）是在卫生间刷吗？
one more question！ |
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l******u
发帖数: 152 | 13 Hi Eric, Thank you for answering all the questions for us. I have a question
regarding dean's letter. Who is the person that usually in charge of the
dean's letter. I am afraid that it will take me forever to get this letter
from my medical school. Do we usually write it ourselves and let them sign
on it or we have to let them write for us.
Thanks! |
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x****1
发帖数: 30 | 14 Kaye, Thanks for your response.
I couldn't find any clearly indication about this question from my
transcript.
The original question is as following:
Enrollment and participation: Our records indicates that XXX attended our
medical school for total of _____weeks of medical education on the following
dates:
From __________/______/_______(dd/mm/yy)
To _________/______/________(dd/mm/yy)
Obviously, it means our 5 years of medical education, but convert to weeks,
not |
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k**e
发帖数: 2728 | 15 These questions might be easy, especially the first one. But I think the bac
kground (clinical knowledge) for the first question is really interesting. I
f you know it welcome to write it out to share :) |
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w********2
发帖数: 86 | 16 Question 16 C
Question 15 A |
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D*******y
发帖数: 189 | 17 I received the following questions in my mailbox. I will post my answers and
hopefully it is useful to those have the same questions:
1. I am originally from China and applied to US dental school last year.
Luckily I was interviewed at several dental schools here. If got accepted,
which one would you choose from your experiences? 1. Case Western, 2. ASDOH
(Arizona school of dental and oral health), 3.U Detroit Mercy 4,loma linda 5
, Upenn.
Answer: Those are all private schools, and only one (Pen |
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D*******y
发帖数: 189 | 18 I received the following questions in my mailbox. I will post my answers and
hopefully it is useful to those have the same questions:
1. I am originally from China and applied to US dental school last year.
Luckily I was interviewed at several dental schools here. If got accepted,
which one would you choose from your experiences? 1. Case Western, 2. ASDOH
(Arizona school of dental and oral health), 3.U Detroit Mercy 4,loma linda 5
, Upenn.
Answer: Those are all private schools, and only one (Pen... 阅读全帖 |
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a*****s
发帖数: 838 | 19 I see.. now it seems transformation is the right answer. I read the question
and thought too much :( Thats why I ended up with excluding the most likely
answer first and over analyzed a lot of things.
The transformation happened in the first experiment; the parallel is to tell
you that when the DNA fragments are digested, (therefore no source for tran
sformation), no resistance observed. To answer your question, yes DNase dige
st DNA away. In the parallel experiment, DNA fragments gone, so no tr |
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f***r
发帖数: 413 | 20 mark all questions you have done in the first round
choose the marked questions only for the second round |
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B******t
发帖数: 123 | 21 似乎申请精神科的同学很少，我把以前的interview questions大致分了一下类，希望
对同学们有帮助。
Personality-related questions
1. Tell me about yourself. a) general professional background; b) most
recent experience in the specialty of interest (clinical/research/
presentation); c) strengths, aptitudes and/or what you feel passionate about
; d) what you are looking for and hope to achieve.
2. Where do you see yourself in 5 years? What are your long term goals? How
much thought have you given to your future plans?
3. Why don’t you tell |
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f*****w
发帖数: 1451 | 22 Hi, Lingzmainz, where did you get all those weird questions?
Do they really ask these kinds of questions?
I think even they ask, there is no right or wrong. They just want to test
your quick response and communication skills.
I would say:
Save life first. Nothing is more important than our lives and health. if I
have enough time, I will definitely get my wallet which contains all my
credit cards, ATM cards and my ID. Then I will save the box contaning the
videos of my kids since their birth. th |
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D*****l
发帖数: 554 | 23 I just start doing UW Qbank.Lots of good questions and answers there, I
tried to save them. But failed. Even "Print Screen" doesn't work. Is there
anyway I can save UW questions? Thank you for your help and suggestions. |
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z****0
发帖数: 12 | 24 Go through ck whole thing within 2-3 wks; chapter by chapter OR section OR subject.
Material: Kaplan notes, FA, UW, MTB, Secrets...whatever! Question-oriented.
Everybody will bring ~10 significant (upon speaker opinion) questions; 3-5 of them would be well-prepared.
PLEASE INPUT YOUR IDEA IF ANY. |
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w******y
发帖数: 4871 | 25 第一题肯定是false啦.
发帖前你不检查一下？ question 2 and 5重复啦。
哪里的board question? step 3? CK? ABIM? ABMS for cardiology?:-) |
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b**h
发帖数: 55 | 26 【 以下文字转载自 Chemistry 讨论区 】
发信人: blxh (kkk), 信区: Chemistry
标 题: lift-off lithography question
发信站: BBS 未名空间站 (Fri Jun 13 12:11:42 2008), 转信
a very simple stupid question:
Is LOR 1A five times diluted than LOR 5A? what is the solvent?
Thanks |
|
f*******y
发帖数: 19 | 27 【 以下文字转载自 Chemistry 讨论区 】
发信人: bridgedragon (non), 信区: Chemistry
标 题: Questionable Data in one JACS paper.
关键字: 'Questionable JACS Paper!'
发信站: BBS 未名空间站 (Wed Jul 1 02:51:32 2009, 美东)
Hydrogen-Bonding Recognition-Induced Color Change of Gold Nanoparticles for
Visual Detection of Melamine in Raw Milk and Infant Formula
Kelong Ai, Yanlan Liu and Lehui Lu
Publication Date (Web): June 18, 2009 (Communication)
DOI: 10.1021/ja9037017
The above paper shows a nice conception. However, their data are m |
|
w******m
发帖数: 226 | 28 Sorry ,the computer can't type with Chinese now .
My question is :i applied NY rn examination .now,my online status indicate
"report issued and mailed ".so ,that mean they have transfered my documents
to New York nursing board ,right ?
What should i do next ? form now ,if i have any questions ,i should ask the
nursing board rather than cgfns, right ?
hurried for your help ! thanks ! |
|
b***f
发帖数: 1 | 29 【 以下文字转载自 Chemistry 讨论区 】
发信人: BVBIF (golden pig), 信区: Chemistry
标 题: Question about EMPV on Agilent 1100 HPLC micro pump
发信站: BBS 未名空间站 (Fri Jan 5 12:56:44 2007)
I have a question about the EMPV error. I have checked all the tubing/
connections and purge the pumps well. But I got EMPV initializing error
message when I tried to start the pump. So I did EMPV testing but the test
was terminated due to "wait timeout" error. (The test stopped at step 5
around 6 minutes)
Could you please provide so |
|
b**u
发帖数: 2761 | 30 January 17, 2008
New Questions on Treating Cholesterol
By ALEX BERENSON
Correction Appended
For decades, the theory that lowering cholesterol is always beneficial has
been a core principle of cardiology. It has been accepted by doctors and
used by drug makers to win quick approval for new medicines to reduce
cholesterol.
But now some prominent cardiologists say the results of two recent clinical
trials have raised serious questions about that theory — and the value of
two widely used cholesterol |
|
h******y
发帖数: 26 | 31 Some friend asked me the following question:
For a real scalar field \phi, assume that H = H_free - \int d^3\ x J \phi. J
(x, t) is just some real number, source, or background field, without second
quantization. Now, what is the amplitude \psi(x, t) for finding a particle
at time t(before, during, or after source is on/off) at position x? The J(x,
t) is nonzero only for finite period of time. And the initial state is
vacuum, when t --> -\infty
This question looks simple. However, I cannot find |
|
y**c
发帖数: 133 | 32 Is there anybody can help me to solve this question:
A sphere of radius=R0 has gas in it;
There has a potential V(R)=V0*exp[-(R-R0)/a].
The atoms are colliding in the sphere, and the potential acts on the particles.
The question is:
How to get the Fourier transform of V(t), i.e.
Integral(from -inf to +inf) [V(t)*V(t+tau)]*exp(-i omega t) d tau
you may consider potential is much smaller than the kinematic energy, if
otherwise too difficult to solve.
Thank you! |
|
j**g
发帖数: 37 | 33 If you could answer one very quick question I'd appreciate it - this takes no
thought, if you do it, do it instantly:
Question: When we think do we look up or down?
REPLY NOW with either UP or DOWN
Thanks |
|
j**g
发帖数: 37 | 34 Thanks to all of you who responded to my earlier quick question.
Here's another (the last) - findings, etc. in 2 days:
If someone asks us a question for which we have to think - e.g.,
"If a car is traveling at 90 m/hour how far will it travel in 1.5
hours?", does the direction in which we change our eye direction
(up/down, etc) depend on whether we can see the speaker's face or
not?
ANSWER - YES or NO - If yes, please explain |
|
l********n
发帖数: 5 | 35 For A, I suppose the question should be:
(1) ...
(2) take the log[X(i+1)/Xi], hence yielding one less element inside the new
data set.
Any one got the solution for this question? |
|
l****n
发帖数: 727 | 36 【 以下文字转载自 JobHunting 讨论区 】
发信人: tuyatmit (dodo), 信区: JobHunting
标 题: JP Morgan phone interview questions
发信站: BBS 未名空间站 (Fri Nov 17 15:05:32 2006)
The guy was very nice, asked me about my research and other stuff in the
resume (I'm wrapping up my PhD in CS).
He asked the following C++/C questions:
1. What's wrong with the following lines of code? Does it complie? If yes,
any problems?
class A { ... };
class B : public A { ... } // definitions of classess, these are OK
Foo() {
A & a = B(); |
|
B*********h
发帖数: 800 | 37 ☆─────────────────────────────────────☆
haotianqi2 (jacky) 于 (Thu Jan 25 02:54:15 2007) 提到:
a NYC ibank quant exam
Four sections: Maths(heavily probability), Puzzle(Brainteezer, some from
Heard on the St), Finance, Computing. Each section has about 8 questions,
choose any 3 sections and only 3 section will be graded. Total 1 hour, so
approximately 4 minutes per question. Very difficult to finish every problem
in chosen 3 sections.Below is for Full-Time version exam.
Seeking solutions to a |
|
r*****t
发帖数: 286 | 38 ☆─────────────────────────────────────☆
pseudo (small man) 于 (Sun Feb 11 00:47:53 2007) 提到:
a question from john hull book. anyone can point out how to think
about such type of questions? thank a million. |
|
B*********h
发帖数: 800 | 39 ☆─────────────────────────────────────☆
dullsword (钝剑) 于 (Sat May 5 20:37:12 2007) 提到:
there are 5 children and 3 different flavors(say A,B,C) of ice cream.
questions: how many ways to distribute the 3 flavors to the 5 children.
Please note: AABBC is considered the same as ABABC here.
I gave the answer but didn't find an elegant formula for this problem during
the interview. what if the question is m children and n flavors of ice
cream?
☆─────────────────────────────────────☆
mfp (desti |
|
b***k
发帖数: 2673 | 40 ☆─────────────────────────────────────☆
haotianqi2 (jacky) 于 (Sat Oct 6 01:37:28 2007) 提到:
Some questions listed below from this big-name IB quant exams given this
week. As usual there are four sections(basic maths, advanced maths and
brainteaser,mathematical finance and CS). Unlike the one given in January,
my feeling is that undergraduate maths were stressed(Series, Linear Algebra,
Geometry) this time and there are much less brainteasers and probability
questions; for CS part, more conce |
|
h********2
发帖数: 23 | 41 Blook has done a nice job of combing a number of 合集 tonight. It took a
while to go through them with all the discussion on each post. I compiled
them and try to put answers immediately after each question that I believe
is right.
In discussion follows, please always indicate the problem # being discussed.
☆─────────────────────────────────────☆
Question 1.
You have a fair coin. Calculate the expected number N of throws
that you need to find two HH at the end of sequence?
A:
For the first one, |
|
d**e
发帖数: 94 | 42 【 以下文字转载自 Stock 讨论区 】
发信人: dude (lost), 信区: Stock
标 题: The $55 trillion question
发信站: BBS 未名空间站 (Tue Sep 30 06:24:14 2008), 转信
The $55 trillion question
The financial crisis has put a spotlight on the obscure world of credit
default swaps - which trade in a vast, unregulated market that most people
haven't heard of and even fewer understand. Will this be the next disaster?
By Nicholas Varchaver, senior editor and Katie Benner, writer-reporter
September 30, 2008: 5:38 AM ET
(Fortune Magazine) -- |
|
y**y
发帖数: 25 | 43 Interview Question (#300!): Black and White
Sample Question #300 (probability brainteaser)
There are x white balls and y black balls in an opaque bag. (Obvisouly, you
can't peek into the bag.) There're also a lot of white and black balls on
the
side. Each time you take a black ball out of the bag, you put a white ball
(from the side) into the bag. If you take a white ball out of the bag, you
do not replace the ball.
After you take out three balls, what's the probability of getting a black
ball o |
|
b******w
发帖数: 52 | 44 I have the following question on calculate forward rate using euro dollar
future.
suppose the euro dollar future rate is edf(t, T_1, T_2) at time t for [T_1,
T_2]
and the forward rate is denoted by f(t, T_1, T_2).
there is a simple formula (maybe only apply for ho-lee model) is
f(t, T_1, T_2) = edf(t, T_1, T_2) - 1/2*T_1*T_2* \sigma^2(t)
My questions are
1. how to calculate sigma(t)? how is sigma(t) calculated from / related to
cap/caplet vol?
2. as the the market practise, what is the "standa |
|
s*********i
发帖数: 66 | 45 Got an interview invitation on a junior software developer position at a
proprietary trading firm, and probability, statistics and financial
mathematics questions will be asked. What are typical math questions for
developer position at trading firm? Thanks! |
|
D**u
发帖数: 204 | 46 The question does not require F to be countable additive.
In the traditional measure theory, every measurable set has a non-negative
measure, so if a measurable set S_1 is a subset of S_2, then measure(S_2) >=
measure(S_1). Then for a P in the 2-d plane, we can use a countable union
of rectangles to "approximate" the measure of P.
The same approximation fails in this question because F does not guarantee a
non-negative "measure" on any polygon. |
|
w******g
发帖数: 67 | 47 "Question about C functions calling C++ STL - can we C structs typecasted
into C++ containers (asked some specifics here)"
Call C functions call STL function?
Actually, this is from someone's interviewing one headhunter sent to you.
So it maybe just part of original question. Any idea, reference or
discussion is welcome.
Thanks a lot. |
|
D**u
发帖数: 204 | 48 1,3,9,27 will do.
You can treat it as a 天平 question. And generally a 天平 question is
related to
三进制.
and
numbers |
|
p****e
发帖数: 1028 | 49 relative value pricing based on competing firm's similar security, or an
convertible index.
or simply use market standard credit premium and vol, then adjust the fi
nal price with a really conservative OAS.
basically a question this open-ended is intended to gauge your personali
ty and your response to real-world questions.
how did you respond?
PLACEMENT.
are |
|
c**a
发帖数: 214 | 50 I saw someone post a website for brain teaser questions on this board some
time, but can't find it anymore. Can someone recommend any website that
has good brain teaser questions? Thanks a lot! |
|
