最新版はこちら。 突っ込みは各日付の BBS エントリのほか、 メール (nakano@st.seikei.ac.jp) や フォーム からどうぞ。 なおスパム除けのため、BBS 機能には 緩い認証を入れて います。 検索エンジンから来た方は、エンジンの方のキャッシュを見るか、 下の簡易検索を試してみてください。
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Namazu for hns による簡易全文検索 詳しくは 詳細指定/ヘルプを参照して下さい |
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RC5・DESに続くdistributed.netの挑戦は、チェスでも素数でもなく「最短ゴロム定規（OGR)」でした。 まぁ例によって我々はクライアントプログラムを走らせるだけですが、OGRとは何か、どのようなアルゴリズムで探索しているのか…と言ったことを理解していれば、楽しさも増し、勧誘もし易くなるに違いありません。 そこで、まだ中途半端な内容ではありますが、今まで集めたOGRに関する情報をまとめてみます。
hd?1 ext2 128M hd?2 swap 512M hd?3 ext3 2G hd?5 ext3 17G hd?6 ext3 60Gひとまず /var と /home には hdc の方のを使った。
dpkg --get-selections | diff -u0 - selections-apdrelay | grep '^-'して不要なパッケージ (dhcp とか ppp とか pppoe とか) を purge。 引き続き
cat selections-apdrelay | sudo dpkg --set-selections sudo cp sources.list /etc/apt/ sudo apt-get update; sudo apt-get dselect-upgrade
#
# global settings
#
syslog facility = daemon
pid file = /var/run/rsyncd.pid
use chroot = true
max connections = 1
hosts allow = 133.220.91.1/32
[backup-apdrelay]
path = /backup
uid = root
gid = root
read only = false
comment = apdrelay backup
として作り、/etc/inetd.conf に
#:rsync: rsync stream tcp nowait root /usr/bin/rsync rsyncd --daemonを追加、/etc/init.d/inetd reload。
sudo rsync -Havvz -n /var /etc /home apdrelay2.ap.seikei.ac.jp::backup-apdrelayで確認、-n を取って実行。 終了後、バックアップサーバの /etc/cron.daily/backup の rsync 行 *2 を有効にした。
TeraTerm Pro Web is the next generation tool for connecting with remote Telnet and SSH hosts. It is built based on the extremely popular open-source TeraTerm product put out by T. Teranishi in 1999 ( click here for original site). In keeping with the original philosophy and spirit of the author, our modified version is completely free!!試さないと!
できてるんですけど、変な感じです。という回答が。ふむ。
どこにも鍵指定していないのに、HDD中の秘密鍵を探してきて
使っているようです。
同じディレクトリにはないのに...
sshd 側の log にも Accepted publickey と出ていますし、
ちゃんと使われているようです。
# そもそも publickey しか許可してないし。
しかも、○○ *1 は putty も使っていて、pagent にパスフレーズを
覚えさせていますが、そいつと通信しているようです。
というわけで、なにも設定していませんが、publickey を使って
パスフレーズ入力なしでログインできています。
動作の仕組みがわからないので気持ち悪くて使う気になりません。:-p
We present a detailed study of the electron emission from a thin MgO(100) film on a Mo substrate, bombarded with slow He+, Ne+, and Ar+ ions. Neither the high absolute number of emitted electrons per incoming ion nor the electron spectra can be due to Auger neutralization of the incoming ions at the MgO surface alone. Therefore, an additional mechanism is proposed: holes created in the MgO film are transported to the MgO-substrate interface where they give rise to an Auger neutralization process involving two electrons from the metal substrate conduction band.ふーむ。要するに Auger Neutralization ではスペクトルを説明できなかったとのこと。 ちなみに Ep〜40eV, d〜1-5 nm。
We introduce a solid-on-solid growth process which evolves by random deposition of dimers, surface diffusion, and evaporation of monomers from the edges of plateaus. It is shown that the model exhibits a robust transition from a smooth to a rough phase. The roughening transition is driven by an absorbing phase transition at the bottom layer of the interface, which displays the same type of critical behavior as the pair contact process with diffusion 2A->3A, 2A->0.リファレンスが多くてよさげ。
WorkSheets(1).Range(Cells(1, 1), Cells(2, 2)).Copyは実行時エラーになるのに
WorkSheets(1).Select Range(Cells(1, 1), Cells(2, 2)).Copyだと OK だったり。
#!/bin/sh for DIR in bin boot dev etc home lib opt root sbin tmp usr var do mirrordir --no-netrc $* /$DIR /backup/$DIR doneという感じで。/dev あたりは rsync ではだめなので、 やっぱ mirrordir はありがたい。 マニュアルも JM に放り込んでからだいぶ経つが、 そろそろ手をつけたいなあ。
scp mke2fs.8 tune2fs.8 [リターン]してしまい、大変切ない気持ちを味わうことに。
About: The pam_mount module allows users to have NCP (Netware), SMB (Windows/Samba), or loopback-encrypted volumes mounted upon login, using the same passwords they typed to log in. A remote volume can even be used as a user's $HOME. Volumes mounted this way are automatically unmounted on logout. Changes: The Debian "could not get password" bug has been fixed.ちょっと面白いかも。
The motion of a stone skimming over a water surface is considered. A simplified description of the collisional process of the stone with water is proposed. The maximum number of bounces is estimated by considering both the slowing down of the stone and its angular stability. The conditions for a successful throw are discussed.ちょっと面白い :-)
We investigate picosecond laser ablation of metals using a hybrid simulation scheme. Laser energy input into the electron system and heat conduction within it are modeled using a finite-difference scheme for solving the heat conduction equation. Atom motion in the near-surface part (72 nm) of the sample is modeled using molecular dynamics. Energy transfer between the electronic and atomic subsystems due to electron-phonon coupling is taken into account. For the special case of 0.5 ps UV laser irradiation of copper, we investigate the fluence dependence of the ablation yield, the temperature and pressure evolution in the target, and the ablation mechanism.レーザーアブレーションの MD+熱拡散 FDM によるモデル化。 蒸発は レーザーで導入された stress によって物体が spallation するからとの議論。 "stress-confinment regime" らしいが、するとチャンクだらけになるわけか?
Recently, scanning tunneling microscopy results on the Brownian motion of two-dimensional vacancy islands on Ag(110) were presented. While the detachment of adatoms from the island and their diffusion on the terrace was permitted in the temperature range between 180 K and 220 K, the periphery diffusion of single adatoms was prohibited. The Brownian motion of the islands was found to follow a simple scaling law with terrace diffusion being the rate-limiting process. The scaling of the experimental results was confirmed by kinetic Monte Carlo (kMC) simulations. Here, we elaborate on the results and especially present a detailed derivation of the equation that relates the diffusivity of an anisotropic island to its size. Further details and results on the kMC simulations will be presented as well. Our results shed light on the recently discussed issue of attempt frequencies for surface diffusion. In this specific case of an anisotropic surface, we obtain prefactor ratios for exchange and hopping mechanisms.Ag(110) 表面での vacancy island の移動の拡散係数 D と、island のサイズがスケール関係にあるという実験結果を受け、kinetic MC で再現を試みた論文。 このスケーリングパラメータは温度 independent らしいんだけど、 実験ではスケール性は確認されたものの、温度によってちょっと変わってるように見える。 anisotoropic な表面なので、kMC での hopping 移動と exchange 移動の確率を変えながら行ってみて island の aspect 比を実験と比較し、その比の範囲を求めたりしている。
The kinetics of diffusion-mediated smoothing of a TiO2 rutile (110) surface is studied over atomic length scales, by using a spot profile analysis of low-energy electron-diffraction data to characterize the morphology of the surface during thermal annealing. After the random removal of less than 1 ML of atoms by sputtering with an argon ion beam, the interface width and the distribution of terrace heights were found to stay nearly constant during annealing at 800 K, with terraces at just two heights making up 90% of the surface area over lateral distances of 400 Angstrom. Meanwhile, the coarsening of this nearly two-dimensional island structure is characterized by the growth of the average terrace width l from 20 to 60 Angstrom with annealing time, following l〜t^β with exponent β= 0.24±0.04. In addition, the stability of an 8% occupation of a third terrace height indicates negligible diffusion flux between layers during annealing. These results are compared with existing models for the microscopic dynamics involved.スパッタダメージを与えた rutile TiO2 (110) の thermal smoothing を diffuse LEED で観察したもの。
同氏によると、今回の最も目立った調整点は、「グーグル爆撃」(googlebombing)と呼ばれる悪ふざけの影響を大幅に抑え込んだことだという。グーグル爆撃というのは、何人ものサイト運営者が自分のページ上に「go to hell」(くたばれ)というような文句書いてそれを www.microsoft.com にリンクさせておくと、グーグルで「go to hell」を検索したときに、米マイクロソフト社のホームページがトップに来る、といういたずらのテクニックだ。にあるんじゃないかと思っています *4 。 だからリンク元のページで「小野澤 英」という単語を用いたのは、 自らのページの「小野澤 英」に対するランクを上げてしまい、 結果的に対象ページのランクを下げる効果となってしまったのでしょう。
In situ high-temperature (Ta = 1050-1250 K) scanning tunneling microscopy was used to determine the coarsening and decay kinetics of two-dimensional TiN adatom and vacancy islands on atomically smooth TiN(111) terraces. We report the first observation of an abrupt decrease in decay rates, irrespective of Ta, of adatom islands with areas less than a critical value of 1600 Angstrom^2. However, no decay rate transition was observed for vacancy islands. We attribute the size-dependent island decay behavior, which is consistent with detachment-limited kinetics, to anisotropic attachment and detachment barriers.ふーむ、anisotoropic な系では attach-detach の energy barrier が異なる、 というのが結論だが、反応経路が違うのかな。
We have produced nanocrystalline titanium dioxide films with different structures (anatase or rutile) by depositing mass selected clusters from the gas phase. Nanoparticles are produced by a pulsed microplasma cluster source and are selected by aerodynamic separation effects. We have characterized nanocrystalline films by Raman spectromicroscopy and transmission electron microscopy, showing that the films assembled with very small clusters have a predominant rutile phase, whereas larger clusters form films with anatase structure. Our observations suggest that phonon confinement effects are responsible for a significant shift and broadening observed for the Raman peaks.
A comprehensive theoretical and experimental study of sputtering from copper surfaces roughened by low-energy Ar+ ion bombardment is reported. The total sputtering yields of thermally deposited Cu samples bombarded by 400-eV and 800-eV ions at 0°-70° angles of incidence have been measured and compared with a numerical model we have developed. To compute sputtering yields from rough surfaces, an original approach has been introduced, which accounts for sputtering anisotropy and shadowing of material emitted at grazing angles. The approach is flexible with respect to surface morphology and can be applied with any submicron structures. To specify the morphology that develops on the Cu surface under low-energy ion bombardment, the surface of bombarded Cu samples has been investigated by scanning electron microscopy. The morphology has been found highly unstable, appearing with random roughening, inclined conelike structures, ripples, or almost flat surfaces, depending on the bombardment conditions. For the samples considered it is found that the angular dependency of the total sputtering yield is strongly affected by surface morphology, which varies with the angle of ion incidence and bombardment energy. Approximations for accounting for the surface roughness required to describe sputtering at particular energy and angular regimes are discussed.おお、すばらしい。って Dew 先生か。 モデルはかなり単純だけど、実測結果が入ってるのがありがたい。
Energy 3kV 1kV Signal 112nA 23.5nA C.Lens 340 456 O.Lens 367 464 Pos.X 1.0 1.0 Pos.Y 0.7 2.1というかんじで。
着磁前 着磁後 中心部 -0.18T -0.19T 周辺 -0.20T -0.21Tという訳であまり変わらず。ちなみに S 極が上向き (欠けのないほう)。
# ### Section: Security ### # We reject $REJECT_ADDR@ARBITRARY.DOM.AIN since these are clearly NOT # individuals. It also may be effective to avoid mail loop since # some error or automatic reply comes from not individual addresses. # This restriction is stronger than $PERMIT_*_FROM variable. # For example, if $PERMIT_POST_FROM is "anyone", fml does not permit # post from root@some.domain. If you permit it, please define $REJECT_ADDR. # # XXX This variable name is ambiguous. It should be $REJECT_ACCOUNT? # # value: regexp string $REJECT_ADDR = "root|postmaster|MAILER-DAEMON|msgs|nobody|news|majordomo|listserv|listproc|\S+\-help|\S+\-subscribe|\S+\-unsubscribe";とりあえず root を消して解決。
During the last decade, self-affine geometrical properties of many growing aggregates, originated in a wide variety of processes, have been well characterized. However, little progress has been achieved in the search of a unified description of the underlying dynamics. Extensive numerical evidence has been given showing that the bulk of aggregates formed upon ballistic aggregation and random deposition with surface relaxation processes can be broken down into a set of infinite scale invariant structures called "trees". These two types of aggregates have been selected because it has been established that they belong to different universality classes: those of Kardar-Parisi-Zhang and Edward-Wilkinson, respectively. Exponents describing the spatial and temporal scale invariance of the trees can be related to the classical exponents describing the self-affine nature of the growing interface. Furthermore, those exponents allows us to distinguish either the compact or non-compact nature of the growing trees. Therefore, the measurement of the statistic of the process of growing trees may become a useful experimental technique for the evaluation of the self-affine properties of some aggregates.
Many systems of both theoretical and applied interest display multi-affine scaling at small length scales. We demonstrate analytically and numerically that when vertical discontinuities are introduced into a self-affine surface, the surface becomes multi-affine. The discontinuities may correspond to surface overhangs or to an underlying stepped surface. Two surfaces are numerically examined with different spatial distributions of vertical discontinuities. The multi-affinity is shown to arise simply from the surface of vertical discontinuities, and the analytic scaling form at small length scales for the surface of discontinuities is derived and compared to numerical results.
一時期レンタル業界とレコード業界でガシガシにもめてたある時期以降ぱったりレンタルを利用しなくなってしまったので、 視界に入ってなかったです。 そうかあ、深夜営業のツタヤが通勤路 (三鷹) にあるし、 また利用しようかなあ。
▼ノーベル賞関連（特に物理学賞）でまた「役に立つ・立たない」議論が起こっている。僕は、そもそもなぜこういう問いが出てくるのかということから考え直す必要があると思う。この後の議論も含め、非常に説得力がある。
▼実利的・即物的に現代の天文学（つまり過去の測量の延長ではない天文学）等が役に立つかというと、（一部を除いて）「役に立たない」ことは確かだろう。ただし、言葉の定義にもよる。そもそも天文学者たちはそれで飯を食ってるわけで、それに付随して先端技術に対してニーズを発し、技術を牽引するという側面もある。そういう面でみれば、役に立っていることはこれまた明らかだ。また何より、人類がどれだけのことを知り得るのか、自然のありようはどうなっているのかという知の地平線を押し広げてくれるという面がある。人類全体の知の地平線が広がる、世界のありようを知る、ありていに言えば教養の幅を広がれば、世界を見る目がこれまでとは変わる。世界が違って見える。その面でこそ、理学部系の学問は「役に立っている」と言えるし、多くの研究者はそこを強調したいのではないかと思う。このことについては、おそらくほとんどの人が総論賛成だろう。
▼さて、最初の問いに戻る。ではなぜ「どんな役に立つのか」という質問が毎回出てくるのか？ 答えは極めて単純である。ほとんどの人々にとって、ノーベル賞級だろうがなんだろうが、多くの研究成果は極めて遠いものであって、自らの知識になってないからだ。研究者達はしばしば、人類の視野を広げ、より世界を奥深いところで理解するために研究している、という。研究（成果）は人類全体の知の財産だと。ところが実際には、ほとんどの知識・知見は、研究者内部に止まり、「人類全体の」知にはなっていないのである。もちろん、全ての人が全てのことを知るのは不可能だ。だが、理学系の研究がより社会的なコンセンサスを得るためには、たとえ一端でもいいから社会全体に成果が行き渡り、研究によって得られた「視野の拡大」が、ある程度共有されていなければならない。工学系の研究成果がそうであるように。トランジスタや導電性プラスチックが世の中にあまねく行き渡っているように、それとある程度同等に、知識が社会の中で共有されなければ。
Changes: In this version, top takes 1/6 less CPU time than in the 3.0.2 release. It also runs on 64-bit hardware again, has a more normal man page, and won't crash when you have lots of processes. Once again, ps can sort. The install will actually install everything, and now lets you skip things you don't want. Memory corruption dating back to the procps-1.x.x days has been fixed. The library is compiled with -fpic again.
Researchers can use microwaves to learn the structure of soil without disturbing it, according to the 28 October print issue of PRL. In the new technique, ground-penetrating radar captures the soil's distribution of solid particles and pores, up to depths of 10 meters. The technique could give agriculturists and environmental scientists a fast and simple way to measure soil properties, which can determine the land's suitability for crops, say the researchers. (K. Oleschko et al., Phys. Rev. Lett. 89, 188501.)関さんのお仕事に関係あるのかしら。
rdiff-backup backs up one directory to another, possibly over a network. The target directory ends up a copy of the source directory, but extra reverse diffs are stored in a special subdirectory of that target directory, so you can still recover files lost some time ago. The idea is to combine the best features of a mirror and an incremental backup. rdiff-backup also preserves subdirectories, hard links, dev files, permissions, uid/gid ownership (if it is running as root), and modification times. Finally, rdiff-backup can operate in a bandwidth efficient manner over a pipe, like rsync. Thus you can use rdiff-backup and ssh to securely back a hard drive up to a remote location, and only the differences will be transmitted.
メンテナさんからの返信はバグ報告者に自動でコピーが来ないものなのかなあ。あれ、来るはずですけど。
This HOWTO describes how to install Linux over a Local Area Network (LAN). It covers setting up and administrating the install server machine as well as installing client machines from your server. Since Network Installation is distribution dependent it covers SuSE, Redhat and Debian installs but also includes a generic Linux network install guide.
This HOWTO is for anyone who owns an ATI Radeon 8xxx graphics card and wants it to function in a certain way or, in general, properly with XFree86, the XWindow system. It describes the procedure of making XFree 4.x run on an ATI R200 (Radeon 8xxx series).
sgml2latex -l ja -o dvi SCSI-Programming-HOWTO.sgml dvipdfm -p a4 -o SCSI-Programming-HOWTO.dviで pdf にして印刷。57 枚。
Galeon の設定スキーマを発見できません GConf の設定をチェックし、より詳細な情報については Galeon の FAQ をご覧下さいというメッセージで起動できなくなったが、FAQ の
16. When I run Galeon I get a message about GConf not being configured
properly. How can I configure GConf?
[snip]
If you have trouble with 1.0.7, most likely it's because your home
directory is NFS-mounted and either your operating system doesn't support
locks in NFS directories or you have stuck locks due to a hard system
crash. Try rm -r ~/.gconf*/*lock if you are sure you have no gconfd
processes (for your login name) running on any machine using your NFS
home directory. If you nuke the lock when gconfd is running and bad stuff
happens, it's your own fault. ;-)
というので解決した。
π ∞
f(r) = ∫dθ ∫dw S_θ(w) |w| exp(2πj wr cosθ)
0 -∞
になるのか。
S のθ依存性はないという仮定だから、
これ積分の順番入換えていいとすると
1 π
J_0(z) = -- ∫ exp (jz cosθ) dθ
π 0
なので
*1
、
∞
f(r) = ∫ dw S(w) |w| π J_0(2πwr)
-∞
かな？(以上 10/21 修正)
In science we often use established code that was developed many years ago. Frequently the documentation is lost and many of us know the feeling of putting a number in the wrong column and trying to understand why the program is not working. However, these old codes are usually very useful, well tested and established. Rather than writing new code from scratch, which must first be tested against the established standard, it is desirable to put a new front end on the standard, commonly referred to as 'wrapping'. This paper will discuss wrapping of FORTRAN code using a selection of other languages to provide simpler user interface.「FORTRAN でいいではないか!」とか言ってみるテスト(笑)
Date: 2002/10/09(Sat) 03:41:19 Download: 1.01Mbps Upload: 412.45kbps
Changes: Linux 2.2.xx users won't get that annoying warning about an ELF note anymore. Other than that, this is an update for top. Now top is even faster, works on dumb terminals, won't mess the screen when you run Linux 2.5.xx, won't show IO-wait unless your kernel supports it, and shows correct CPU stats for cpu0 on an SMP system.
Name Service Switch has changed in the C Library. Running programs may not be able to do NSS lookups until they are restarted (for services such as ssh, this can affect your ability to login). Note: restarting sshd should not affect any existing connections. The services detected are: inetd cron proftpd apache ssh exim nis If other services begin to fail mysteriously after this upgrade, it may be necessary to restart them too. Do you wish to Restart Services? [Y/n] Restarting services possibly affected by the upgrade: inetd: stopping...starting...done. cron: stopping...starting...done. proftpd: stopping...starting...done. apache: stopping...starting...done. ssh: stopping...starting...done. exim: stopping...starting...done. nis: stopping...starting...done. Services restarted succesfully!というかんじで :-)
NeXus is an international standard data format intended to reduce the need for redundant software development efforts in the neutron and x-ray scattering communities. As the NeXus standard matures it is starting to be used at laboratories for storing raw data. The Manuel Lujan Jr. Neutron Scattering Center (MLNSC) at Los Alamos National Laboratory and the Intense Pulsed Neutron Source (IPNS) at Argonne National Laboratory have been working with NeXus in an effort to share data and software. MLNSC is now writing files compliant with NeXus and the Integrated Spectral Analysis Workbench (ISAW) software from IPNS is being used with this data. Problems can arise if the standard is interpreted in different ways and information that belongs in the file is not accounted for in the standard. This paper will discuss an inter-laboratory collaboration in relation to a maturing data standard.
Changes: This release adds a Cross-Site Scripting (XSS) vulnerability fix related to message header field labels, along with some minor fixes and changes. All users are encouraged to upgrade.
A 30 nm Pt thin film evaporated onto a Si wafer was sputtered by 8 keV Ar$^{+}$ ions at various ion doses. The evolution of the modified sputtered films was monitored by atomic force microscopy (AFM), high resolution scanning electron microscopy (HRSEM) and Rutherford backscattering spectrometry (RBS). The most interesting observation was the formation of mound-like structures on the metal surface. Morphological data were quantitatively analysed within the framework of the dynamic scaling theory. Analyses of the height-height correlation function for different doses yield roughness exponents $\alpha $ in the range 0.65 - 0.87, while the root-mean-square roughness amplitude $w$ evolves with the dose $\phi $ as a power law $w\propto \phi ^{\beta}$, with the growth exponent, $\beta $ $\approx $ 0.3. The results are discussed.0.01〜0.2um くらいの範囲。
この製品は台湾の製造会社が製作しています。付属の部品等は決まったものが付属するのですが、トランジスタやダイオードに関しては例外です。例えばトランジスタでしたら“2SC390”といった型番まで固定しているわけではなく、“2SCのトランジスタで規格が適するもの”までしか決まっていません。これは、あるトランジスタが製造中止になった場合に規格の似通ったものに差し替えていくためです。ただ、この差し替えがあると、計算上は動くはずなのに、実際には動かないということが起こり得ます。また、部品の個体差によって、動かなくなってしまうこともあります。とか、 ロジブロック の
ブロックの工作精度があまり高くありません。接合が少しゆるい場合や、きつい場合があります。とかは消費者をナメすぎのような気がするのですが(笑)
このため回路の組立直後には、接触不良が起こる場合もあります。
しかし、接触不良を逆手に取って学ぶことも出来ます。信号を受け取ったブロックではLED（発光ダイオード）が点灯しますが、接触不良の場所以降ではLEDは点灯しません。ですから、これを利用して論理的に接触不良の位置が割り出せます。