赛扬3855u这个cpu怎么u²-u+1怎么算出来的 求过程
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时间：2018-04-21 09:08
AOC发布32寸4K显示器U3277PWQU：178度可视、VA面板-闽南网
AOC发布32寸4K显示器U3277PWQU：178度可视、VA面板
来源:快科技
4K显示器渐渐被越来越多消费者接受，今天，AOC（冠捷）发布了U3277PWQU新品。
显示器设计为32英寸，分辨率3840 x 2160，VA面板，178度可视角，无闪屏技术。
显示器的纵横比为16:9标准宽屏，亮度300尼特，对比度，响应时间4ms，刷新率60Hz。
接口方面提供VGA, DVI, HDMI-MHL, DP, 2 x USB 3.0 (1 x 快充), 2 x USB 2.0。
最后是价格，虽然官方标称700美元，但亚马逊、B&H只做到了500美元（约合3400元），是市面同尺寸最便宜的4K显示产品了。
“夏夜与美食更配”在泉州人身上展现得淋漓尽致。趁着夜里的些许凉意，约上亲朋好友一
48小时点击排行榜九亭u天地 3室1卫1厅(个人)
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租房看行情，别贪小便宜；房东在外地，时刻需警惕；签订合同前，千万别给钱！正在加载验证码......
请先拖动验证码到相应位置(1+u^2)/[u(1-u^2)]的积分如何求？求详解！_百度知道
(1+u^2)/[u(1-u^2)]的积分如何求？求详解！
∫(1+u²)/[u(1-u²)] *du
= ∫[1/u + 2u/(1-u²)] *du
= ∫(1/u) *du + ∫[2u/(1-u²)] *du
= ∫(1/u) *du - ∫[1/(1-u²)] *d(1-u²)
= lnu - ln(1-u²) +c
采纳率：68%
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KAMADA Ken'ichi
Derek Atkins
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At Fri, 23 Sep :02 -0400,
Derek Atkins
> So have we come to consensus on how to handle these issues?
> If there was a misunderstanding from the reading of the text,
> then we should add some additional text to help ensure that
> the same misunderstanding does not occur again.
The revised text in msgid: should
address this, I think.
I've also merged most of the comments from Ken.
I've put the current version and an rfcdiff.
One thing I'd like to hear from the WG (esp. Mike?):
At Wed, 7 Sep :29 -0400,
Ken Raeburn
> Relatively minor stuff:
> - Introduction:
Kerberos, like any internet protocol, does have
its own security considerations.
You can find them discussed in
[KERBEROS].
That's security-considerations material, not introductory
> material.
In fact, I think the security considerations section
> already talks about it.
These sentences seem to have been added as a result of the
previous IESG review, for a comment from Randy Bush.
(See the first comment.)
I feel he was not focusing on security vulnerabilities (as he gave
scalability as an example).
So, I'll replace that part with the following.
Kerberos, like any internet protocol, does have drawbacks on certain
environments.
You can find them discussed in [KERBEROS] and its
references.
Do you have better sentences?
KAMADA Ken'ichi
Tue Sep 27 12:43:47 2005
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From owner-ietf-kink@mail.vpnc.org Fri Sep 30 03:47:42 2005
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I think that this sentence should not be in the introduction,
should be in the security consideration that Ken mentioned.
On the other hand, there is a same sentence in the security
consideration.
So we might be able to just remove it.
However the sentence was added after a IESG review.
Thus I do not
know we can remove it easily.
Derek, could you decide whether it can remove or not ?
> > Relatively minor stuff:
> > - Introduction:
Kerberos, like any internet protocol, does have
its own security considerations.
You can find them discussed in
[KERBEROS].
That's security-considerations material, not introductory
> > material.
In fact, I think the security considerations section
> > already talks about it.
> These sentences seem to have been added as a result of the
> previous IESG review, for a comment from Randy Bush.
> (See the first comment.)
> I feel he was not focusing on security vulnerabilities (as he gave
> scalability as an example).
> So, I'll replace that part with the following.
Kerberos, like any internet protocol, does have drawbacks on certain
environments.
You can find them discussed in [KERBEROS] and its
references.
> Do you have better sentences?
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From: Kazunori Miyazawa
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To: "KAMADA Ken'ichi"
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Subject: Re: Ticket and SA lifetime (Re: kink-09)
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KAMADA Ken'ichi wrote:
> At Wed, 7 Sep :29 -0400,
> Ken Raeburn
>>Relatively minor stuff:
>>- Section 3.6: One case that might be worth mentioning is when the
>>user's tickets are going to expire at the end of the "hard lifetime
>>by time" of the SA.
In that case, unless there's some other reason
>>(lifetime by byte count?), there's no purpose in attempting to rekey,
>>because the new SA will have the same expiration time.
(This sort of
>>applies also in renewable-TGT or PKINIT or keytab cases when the KDC
>>isn't available to issue a new TGT, but that could be seen as
>>starting the rekey process and then failing.)
In some environments,
>>it may make sense to prompt the user to re-enter their password, but
>>until the new tickets are actually acquired (or the byte count gets
>>high enough), it makes no sense to continue.
> Do you assume that the SA lifetime is truncated to the ticket endtime?
> Is the lifetime of application session limited to the service ticket
> in usual Kerberized applications?
> I.e., if I (kerberized-)telnet to a remote host with a service ticket,
> what will happen when the ticket expires?
Is the telnet session
> disconnected?
> # I can't find something on this in RFC 4120 or RFC 2942.
> Sidenote: at least when Key Exchange payloads are used,
> a ticket and an SA will have independent lifetimes.
I think Mr. Raeburn might point that KINK should obtain new ticket before rekey
if the ticket is going to expire.
I accordingly thought we needed to change the 2nd paragraph in the section 3.6 to
There are no special semantics for rekeying SAs in KINK.
That is, in
order to rekey an existing SA, the initiator must CREATE a new SA
followed by either deleting the old SA with the DELETE flow or
letting it timeout (If the initiator needs a new service ticket
it should obtain it in advance).
When identical flow selectors are
available on different SAs, KINK implementations SHOULD choose the SA most
recently created.
It should be noted that KINK avoids most of the
problems of [IKE] rekeying by having a reliable delete mechanism.
But, I found in the section 3
KINK uses Kerberos as the authentication mechanism, therefore a KINK
host needs to get a service ticket for each peer before actual key
negotiations.
This is basically a pure Kerberos exchange and the
actual KDC traffic here is for illustrative purposes only.
practice, when a principal obtains various tickets is a subject of
Kerberos and local policy consideration.
I think when and how getting a servcice ticket is a local matter and
it does not cause interoperability issues so that we don't need the change.
Kazunori Miyazawa
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To: Kazunori Miyazawa
CC: "KAMADA Ken'ichi" , ietf-kink@vpnc.org
Subject: Re: Ticket and SA lifetime (Re: kink-09)
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What I'd appreciate here is some insight as to what other
Kerberized applications do, especially ones that have their
own session timers. If they all mimimize their lifetimes to
the extant of the kerberos ticket lifetime, then that pretty
much tells us we should too. If some are independant, then I
think it's probably a local policy decision of the receiver
assuming that the ISAKMP negotiation allows a longer proposed
lifetime to be shortened by the receiver. If that's the case,
then I don't think that the spec needs to recommend anything,
and if it does it should at most be a SHOULD.
Kazunori Miyazawa wrote:
> KAMADA Ken'ichi wrote:
>> At Wed, 7 Sep :29 -0400,
>> Ken Raeburn
>>> Relatively minor stuff:
>>> - Section 3.6: One case that might be worth mentioning is when the
>>> user's tickets are going to expire at the end of the "hard lifetime
>>> by time" of the SA.
In that case, unless there's some other reason
>>> (lifetime by byte count?), there's no purpose in attempting to
>>> rekey,
because the new SA will have the same expiration time.
>>> sort of
applies also in renewable-TGT or PKINIT or keytab cases when
>>> the KDC
isn't available to issue a new TGT, but that could be seen
starting the rekey process and then failing.)
>>> environments,
it may make sense to prompt the user to re-enter their
>>> password, but
until the new tickets are actually acquired (or the
>>> byte count gets
high enough), it makes no sense to continue.
>> Do you assume that the SA lifetime is truncated to the ticket endtime?
>> Is the lifetime of application session limited to the service ticket
>> in usual Kerberized applications?
>> I.e., if I (kerberized-)telnet to a remote host with a service ticket,
>> what will happen when the ticket expires?
Is the telnet session
>> disconnected?
>> # I can't find something on this in RFC 4120 or RFC 2942.
>> Sidenote: at least when Key Exchange payloads are used,
>> a ticket and an SA will have independent lifetimes.
> I think Mr. Raeburn might point that KINK should obtain new ticket
> before rekey
> if the ticket is going to expire.
> I accordingly thought we needed to change the 2nd paragraph in the
> section 3.6 to
There are no special semantics for rekeying SAs in KINK.
That is, in
order to rekey an existing SA, the initiator must CREATE a new SA
followed by either deleting the old SA with the DELETE flow or
letting it timeout (If the initiator needs a new service ticket
it should obtain it in advance).
When identical flow selectors are
available on different SAs, KINK implementations SHOULD choose the SA
recently created.
It should be noted that KINK avoids most of the
problems of [IKE] rekeying by having a reliable delete mechanism.
> But, I found in the section 3
KINK uses Kerberos as the authentication mechanism, therefore a KINK
host needs to get a service ticket for each peer before actual key
negotiations.
This is basically a pure Kerberos exchange and the
actual KDC traffic here is for illustrative purposes only.
practice, when a principal obtains various tickets is a subject of
Kerberos and local policy consideration.
> I think when and how getting a servcice ticket is a local matter and
> it does not cause interoperability issues so that we don't need the change.
From owner-ietf-kink@mail.vpnc.org Fri Sep 30 15:30:13 2005
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From: Ken Raeburn
Subject: Re: Ticket and SA lifetime (Re: kink-09)
Date: Fri, 30 Sep :31 -0400
To: "KAMADA Ken'ichi"
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On Sep 13, 2005, at 21:24, KAMADA Ken'ichi wrote:
> Do you assume that the SA lifetime is truncated to the ticket endtime?
For some reason I was thinking it was, but now I see nothing in the
draft to support that.
> Is the lifetime of application session limited to the service ticket
> in usual Kerberized applications?
> I.e., if I (kerberized-)telnet to a remote host with a service ticket,
> what will happen when the ticket expires?
Is the telnet session
> disconnected?
> # I can't find something on this in RFC 4120 or RFC 2942.
It depends on the application.
Sometimes the session dies
immediately, sometimes the session is kept open indefinitely.
Sorry, I should've checked more closely....
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To: Ken Raeburn
CC: "KAMADA Ken'ichi" , ietf-kink@vpnc.org
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Ken Raeburn wrote:
> On Sep 13, 2005, at 21:24, KAMADA Ken'ichi wrote:
>> Do you assume that the SA lifetime is truncated to the ticket endtime?
> For some reason I was thinking it was, but now I see nothing in the
> draft to support that.
>> Is the lifetime of application session limited to the service ticket
>> in usual Kerberized applications?
>> I.e., if I (kerberized-)telnet to a remote host with a service ticket,
>> what will happen when the ticket expires?
Is the telnet session
>> disconnected?
>> # I can't find something on this in RFC 4120 or RFC 2942.
> It depends on the application.
Sometimes the session dies
immediately,
> sometimes the session is kept open indefinitely.
> Sorry, I should've checked more closely....
Then so long as the IKE phase 2 negotiations have the
ability for the receiver to minimize the lifetime (which
I think it does), then I don't really think there's much
if anything that the spec needs to say about this.
From EloyKrueger@lolita-sex.co.uk Fri Sep 30 17:42:30 2005
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At Fri, 23 Sep :02 -0400,
Derek Atkins
> So have we come to consensus on how to handle these issues?
> If there was a misunderstanding from the reading of the text,
> then we should add some additional text to help ensure that
> the same misunderstanding does not occur again.
The revised text in msgid: should
address this, I think.
I've also merged most of the comments from Ken.
I've put the current version and an rfcdiff.
One thing I'd like to hear from the WG (esp. Mike?):
At Wed, 7 Sep :29 -0400,
Ken Raeburn
> Relatively minor stuff:
> - Introduction:
Kerberos, like any internet protocol, does have
its own security considerations.
You can find them discussed in
[KERBEROS].
That's security-considerations material, not introductory
> material.
In fact, I think the security considerations section
> already talks about it.
These sentences seem to have been added as a result of the
previous IESG review, for a comment from Randy Bush.
(See the first comment.)
I feel he was not focusing on security vulnerabilities (as he gave
scalability as an example).
So, I'll replace that part with the following.
Kerberos, like any internet protocol, does have drawbacks on certain
environments.
You can find them discussed in [KERBEROS] and its
references.
Do you have better sentences?
KAMADA Ken'ichi
Tue Sep 27 12:43:47 2005
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From owner-ietf-kink@mail.vpnc.org Fri Sep 30 03:47:42 2005
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I think that this sentence should not be in the introduction,
should be in the security consideration that Ken mentioned.
On the other hand, there is a same sentence in the security
consideration.
So we might be able to just remove it.
However the sentence was added after a IESG review.
Thus I do not
know we can remove it easily.
Derek, could you decide whether it can remove or not ?
> > Relatively minor stuff:
> > - Introduction:
Kerberos, like any internet protocol, does have
its own security considerations.
You can find them discussed in
[KERBEROS].
That's security-considerations material, not introductory
> > material.
In fact, I think the security considerations section
> > already talks about it.
> These sentences seem to have been added as a result of the
> previous IESG review, for a comment from Randy Bush.
> (See the first comment.)
> I feel he was not focusing on security vulnerabilities (as he gave
> scalability as an example).
> So, I'll replace that part with the following.
Kerberos, like any internet protocol, does have drawbacks on certain
environments.
You can find them discussed in [KERBEROS] and its
references.
> Do you have better sentences?
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From: Kazunori Miyazawa
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To: "KAMADA Ken'ichi"
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Subject: Re: Ticket and SA lifetime (Re: kink-09)
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KAMADA Ken'ichi wrote:
> At Wed, 7 Sep :29 -0400,
> Ken Raeburn
>>Relatively minor stuff:
>>- Section 3.6: One case that might be worth mentioning is when the
>>user's tickets are going to expire at the end of the "hard lifetime
>>by time" of the SA.
In that case, unless there's some other reason
>>(lifetime by byte count?), there's no purpose in attempting to rekey,
>>because the new SA will have the same expiration time.
(This sort of
>>applies also in renewable-TGT or PKINIT or keytab cases when the KDC
>>isn't available to issue a new TGT, but that could be seen as
>>starting the rekey process and then failing.)
In some environments,
>>it may make sense to prompt the user to re-enter their password, but
>>until the new tickets are actually acquired (or the byte count gets
>>high enough), it makes no sense to continue.
> Do you assume that the SA lifetime is truncated to the ticket endtime?
> Is the lifetime of application session limited to the service ticket
> in usual Kerberized applications?
> I.e., if I (kerberized-)telnet to a remote host with a service ticket,
> what will happen when the ticket expires?
Is the telnet session
> disconnected?
> # I can't find something on this in RFC 4120 or RFC 2942.
> Sidenote: at least when Key Exchange payloads are used,
> a ticket and an SA will have independent lifetimes.
I think Mr. Raeburn might point that KINK should obtain new ticket before rekey
if the ticket is going to expire.
I accordingly thought we needed to change the 2nd paragraph in the section 3.6 to
There are no special semantics for rekeying SAs in KINK.
That is, in
order to rekey an existing SA, the initiator must CREATE a new SA
followed by either deleting the old SA with the DELETE flow or
letting it timeout (If the initiator needs a new service ticket
it should obtain it in advance).
When identical flow selectors are
available on different SAs, KINK implementations SHOULD choose the SA most
recently created.
It should be noted that KINK avoids most of the
problems of [IKE] rekeying by having a reliable delete mechanism.
But, I found in the section 3
KINK uses Kerberos as the authentication mechanism, therefore a KINK
host needs to get a service ticket for each peer before actual key
negotiations.
This is basically a pure Kerberos exchange and the
actual KDC traffic here is for illustrative purposes only.
practice, when a principal obtains various tickets is a subject of
Kerberos and local policy consideration.
I think when and how getting a servcice ticket is a local matter and
it does not cause interoperability issues so that we don't need the change.
Kazunori Miyazawa
From owner-ietf-kink@mail.vpnc.org Fri Sep 30 11:25:29 2005
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Subject: Re: Ticket and SA lifetime (Re: kink-09)
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What I'd appreciate here is some insight as to what other
Kerberized applications do, especially ones that have their
own session timers. If they all mimimize their lifetimes to
the extant of the kerberos ticket lifetime, then that pretty
much tells us we should too. If some are independant, then I
think it's probably a local policy decision of the receiver
assuming that the ISAKMP negotiation allows a longer proposed
lifetime to be shortened by the receiver. If that's the case,
then I don't think that the spec needs to recommend anything,
and if it does it should at most be a SHOULD.
Kazunori Miyazawa wrote:
> KAMADA Ken'ichi wrote:
>> At Wed, 7 Sep :29 -0400,
>> Ken Raeburn
>>> Relatively minor stuff:
>>> - Section 3.6: One case that might be worth mentioning is when the
>>> user's tickets are going to expire at the end of the "hard lifetime
>>> by time" of the SA.
In that case, unless there's some other reason
>>> (lifetime by byte count?), there's no purpose in attempting to
>>> rekey,
because the new SA will have the same expiration time.
>>> sort of
applies also in renewable-TGT or PKINIT or keytab cases when
>>> the KDC
isn't available to issue a new TGT, but that could be seen
starting the rekey process and then failing.)
>>> environments,
it may make sense to prompt the user to re-enter their
>>> password, but
until the new tickets are actually acquired (or the
>>> byte count gets
high enough), it makes no sense to continue.
>> Do you assume that the SA lifetime is truncated to the ticket endtime?
>> Is the lifetime of application session limited to the service ticket
>> in usual Kerberized applications?
>> I.e., if I (kerberized-)telnet to a remote host with a service ticket,
>> what will happen when the ticket expires?
Is the telnet session
>> disconnected?
>> # I can't find something on this in RFC 4120 or RFC 2942.
>> Sidenote: at least when Key Exchange payloads are used,
>> a ticket and an SA will have independent lifetimes.
> I think Mr. Raeburn might point that KINK should obtain new ticket
> before rekey
> if the ticket is going to expire.
> I accordingly thought we needed to change the 2nd paragraph in the
> section 3.6 to
There are no special semantics for rekeying SAs in KINK.
That is, in
order to rekey an existing SA, the initiator must CREATE a new SA
followed by either deleting the old SA with the DELETE flow or
letting it timeout (If the initiator needs a new service ticket
it should obtain it in advance).
When identical flow selectors are
available on different SAs, KINK implementations SHOULD choose the SA
recently created.
It should be noted that KINK avoids most of the
problems of [IKE] rekeying by having a reliable delete mechanism.
> But, I found in the section 3
KINK uses Kerberos as the authentication mechanism, therefore a KINK
host needs to get a service ticket for each peer before actual key
negotiations.
This is basically a pure Kerberos exchange and the
actual KDC traffic here is for illustrative purposes only.
practice, when a principal obtains various tickets is a subject of
Kerberos and local policy consideration.
> I think when and how getting a servcice ticket is a local matter and
> it does not cause interoperability issues so that we don't need the change.
From owner-ietf-kink@mail.vpnc.org Fri Sep 30 15:30:13 2005
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From: Ken Raeburn
Subject: Re: Ticket and SA lifetime (Re: kink-09)
Date: Fri, 30 Sep :31 -0400
To: "KAMADA Ken'ichi"
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On Sep 13, 2005, at 21:24, KAMADA Ken'ichi wrote:
> Do you assume that the SA lifetime is truncated to the ticket endtime?
For some reason I was thinking it was, but now I see nothing in the
draft to support that.
> Is the lifetime of application session limited to the service ticket
> in usual Kerberized applications?
> I.e., if I (kerberized-)telnet to a remote host with a service ticket,
> what will happen when the ticket expires?
Is the telnet session
> disconnected?
> # I can't find something on this in RFC 4120 or RFC 2942.
It depends on the application.
Sometimes the session dies
immediately, sometimes the session is kept open indefinitely.
Sorry, I should've checked more closely....
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To: Ken Raeburn
CC: "KAMADA Ken'ichi" , ietf-kink@vpnc.org
Subject: Re: Ticket and SA lifetime (Re: kink-09)
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Ken Raeburn wrote:
> On Sep 13, 2005, at 21:24, KAMADA Ken'ichi wrote:
>> Do you assume that the SA lifetime is truncated to the ticket endtime?
> For some reason I was thinking it was, but now I see nothing in the
> draft to support that.
>> Is the lifetime of application session limited to the service ticket
>> in usual Kerberized applications?
>> I.e., if I (kerberized-)telnet to a remote host with a service ticket,
>> what will happen when the ticket expires?
Is the telnet session
>> disconnected?
>> # I can't find something on this in RFC 4120 or RFC 2942.
> It depends on the application.
Sometimes the session dies
immediately,
> sometimes the session is kept open indefinitely.
> Sorry, I should've checked more closely....
Then so long as the IKE phase 2 negotiations have the
ability for the receiver to minimize the lifetime (which
I think it does), then I don't really think there's much
if anything that the spec needs to say about this.
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