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• Linux bcm43224 wifi adapter slows down a couple minutes after boot

  - by Blubber

  I just installed Ubuntu on my mid 2012 MacBook Air. Everything worked out of the box, but the wifi is showing some weird behavior. When I first login it's really fast, loading google.com is near instant, and browsing in general feels at least as smooth as it did on Mac OS. However, after a couple minutes the connection slows down dramatically, sometimes it takes over 5s to load google.com, a simple reboot fixes the problem for another couple minutes. Specs: Wifi: 02:00.0 Network controller: Broadcom Corporation BCM43224 802.11a/b/g/n (rev 01) Driver: open-source brcmsmac driver Kernel: Linux wega 3.8.0-21-generic #32-Ubuntu SMP Tue May 14 22:16:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux Distro: Ubuntu 13.04 (uptodate) I tried a number of things, none of which actually helped Use proprietary sta driver from broadcom Installed firmware into /lib/firmware/brcms (which, as far as I can tell from logs, does not get loaded at all) Switch router to only use 2.4 OR 5 GHz Set router to only use a OR g OR n Set router to use AES encryption only Turned off power management on the adapter Set regulatory region to the correct value (NL) on both router and laptop Disable ipv6 Nothing seems to help, the slowdown always occurs. I did notice that the latency (ping google.com) stays roughly the same (around 9ms). Below is some more information that might be of use. $ lspci -nnk | grep -iA2 net 02:00.0 Network controller [0280]: Broadcom Corporation BCM43224 802.11a/b/g/n [14e4:4353] (rev 01) Subsystem: Apple Inc. Device [106b:00e9] Kernel driver in use: bcma-pci-bridge $ rfkill list 0: hci0: Bluetooth Soft blocked: no Hard blocked: no 1: phy0: Wireless LAN Soft blocked: no Hard blocked: no $ lsmod Module Size Used by dm_crypt 22820 1 arc4 12615 2 brcmsmac 550698 0 coretemp 13355 0 kvm_intel 132891 0 parport_pc 28152 0 kvm 443165 1 kvm_intel ppdev 17073 0 cordic 12574 1 brcmsmac brcmutil 14755 1 brcmsmac mac80211 606457 1 brcmsmac cfg80211 510937 2 brcmsmac,mac80211 bnep 18036 2 rfcomm 42641 12 joydev 17377 0 applesmc 19353 0 input_polldev 13896 1 applesmc snd_hda_codec_hdmi 36913 1 microcode 22881 0 snd_hda_codec_cirrus 23829 1 nls_iso8859_1 12713 1 uvcvideo 80847 0 btusb 22474 0 snd_hda_intel 39619 3 videobuf2_vmalloc 13056 1 uvcvideo snd_hda_codec 136453 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_cirrus bcm5974 17347 0 bluetooth 228619 22 bnep,btusb,rfcomm snd_hwdep 13602 1 snd_hda_codec lpc_ich 17061 0 videobuf2_memops 13202 1 videobuf2_vmalloc videobuf2_core 40513 1 uvcvideo videodev 129260 2 uvcvideo,videobuf2_core bcma 41051 1 brcmsmac snd_pcm 97451 3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel snd_page_alloc 18710 2 snd_pcm,snd_hda_intel snd_seq_midi 13324 0 snd_seq_midi_event 14899 1 snd_seq_midi snd_rawmidi 30180 1 snd_seq_midi snd_seq 61554 2 snd_seq_midi_event,snd_seq_midi snd_seq_device 14497 3 snd_seq,snd_rawmidi,snd_seq_midi snd_timer 29425 2 snd_pcm,snd_seq snd 68876 16 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_hda_codec_cirrus mei 41158 0 soundcore 12680 1 snd apple_bl 13673 0 mac_hid 13205 0 lp 17759 0 parport 46345 3 lp,ppdev,parport_pc usb_storage 57204 0 hid_apple 13237 0 hid_generic 12540 0 ghash_clmulni_intel 13259 0 aesni_intel 55399 399 aes_x86_64 17255 1 aesni_intel xts 12885 1 aesni_intel lrw 13257 1 aesni_intel gf128mul 14951 2 lrw,xts ablk_helper 13597 1 aesni_intel cryptd 20373 4 ghash_clmulni_intel,aesni_intel,ablk_helper i915 600351 3 ahci 25731 3 libahci 31364 1 ahci video 19390 1 i915 i2c_algo_bit 13413 1 i915 drm_kms_helper 49394 1 i915 usbhid 47074 0 drm 286313 4 i915,drm_kms_helper hid 101002 3 hid_generic,usbhid,hid_apple $ dmesg | egrep 'b43|bcma|brcm|[F]irm' [ 0.055025] [Firmware Bug]: ioapic 2 has no mapping iommu, interrupt remapping will be disabled [ 0.152336] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored [ 2.187681] pci_root PNP0A08:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-99] only partially covers this bridge [ 12.553600] bcma-pci-bridge 0000:02:00.0: enabling device (0000 -> 0002) [ 12.553657] bcma: bus0: Found chip with id 0xA8D8, rev 0x01 and package 0x08 [ 12.553688] bcma: bus0: Core 0 found: ChipCommon (manuf 0x4BF, id 0x800, rev 0x22, class 0x0) [ 12.553715] bcma: bus0: Core 1 found: IEEE 802.11 (manuf 0x4BF, id 0x812, rev 0x17, class 0x0) [ 12.553764] bcma: bus0: Core 2 found: PCIe (manuf 0x4BF, id 0x820, rev 0x0F, class 0x0) [ 12.605777] bcma: bus0: Bus registered [ 12.852925] brcmsmac bcma0:0: mfg 4bf core 812 rev 23 class 0 irq 17 [ 13.085176] brcmsmac bcma0:0: brcms_ops_bss_info_changed: qos enabled: false (implement) [ 13.085186] brcmsmac bcma0:0: brcms_ops_config: change power-save mode: false (implement) [ 20.862617] brcmsmac bcma0:0: brcmsmac: brcms_ops_bss_info_changed: associated [ 20.862622] brcmsmac bcma0:0: brcms_ops_bss_info_changed: arp filtering: enabled true, count 0 (implement) [ 20.862625] brcmsmac bcma0:0: brcms_ops_bss_info_changed: qos enabled: true (implement) [ 20.897957] brcmsmac bcma0:0: brcms_ops_bss_info_changed: arp filtering: enabled true, count 1 (implement) $ iwconfig lo no wireless extensions. wlan0 IEEE 802.11abgn ESSID:"wlan" Mode:Managed Frequency:5.22 GHz Access Point: E0:46:9A:4E:63:9A Bit Rate=65 Mb/s Tx-Power=17 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=63/70 Signal level=-47 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:13 Invalid misc:56 Missed beacon:0

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• How to rotate a set of points on z = 0 plane in 3-D, preserving pairwise distances?

  - by cagirici

  I have a set of points double n[] on the plane z = 0. And I have another set of points double[] m on the plane ax + by + cz + d = 0. Length of n is equal to length of m. Also, euclidean distance between n[i] and n[j] is equal to euclidean distance between m[i] and m[j]. I want to rotate n[] in 3-D, such that for all i, n[i] = m[i] would be true. In other words, I want to turn a plane into another plane, preserving the pairwise distances. Here's my code in java. But it does not help so much: double[] rotate(double[] point, double[] currentEquation, double[] targetEquation) { double[] currentNormal = new double[]{currentEquation[0], currentEquation[1], currentEquation[2]}; double[] targetNormal = new double[]{targetEquation[0], targetEquation[1], targetEquation[2]}; targetNormal = normalize(targetNormal); double angle = angleBetween(currentNormal, targetNormal); double[] axis = cross(targetNormal, currentNormal); double[][] R = getRotationMatrix(axis, angle); return rotated; } double[][] getRotationMatrix(double[] axis, double angle) { axis = normalize(axis); double cA = (float)Math.cos(angle); double sA = (float)Math.sin(angle); Matrix I = Matrix.identity(3, 3); Matrix a = new Matrix(axis, 3); Matrix aT = a.transpose(); Matrix a2 = a.times(aT); double[][] B = { {0, axis[2], -1*axis[1]}, {-1*axis[2], 0, axis[0]}, {axis[1], -1*axis[0], 0} }; Matrix A = new Matrix(B); Matrix R = I.minus(a2); R = R.times(cA); R = R.plus(a2); R = R.plus(A.times(sA)); return R.getArray(); } This is what I get. The point set on the right side is actually part of a point set on the left side. But they are on another plane. Here's a 2-D representation of what I try to do: There are two lines. The line on the bottom is the line I have. The line on the top is the target line. The distances are preserved (a, b and c). Edit: I have tried both methods written in answers. They both fail (I guess). Method of Martijn Courteaux public static double[][] getRotationMatrix(double[] v0, double[] v1, double[] v2, double[] u0, double[] u1, double[] u2) { RealMatrix M1 = new Array2DRowRealMatrix(new double[][]{ {1,0,0,-1*v0[0]}, {0,1,0,-1*v0[1]}, {0,0,1,0}, {0,0,0,1} }); RealMatrix M2 = new Array2DRowRealMatrix(new double[][]{ {1,0,0,-1*u0[0]}, {0,1,0,-1*u0[1]}, {0,0,1,-1*u0[2]}, {0,0,0,1} }); Vector3D imX = new Vector3D((v0[1] - v1[1])*(u2[0] - u0[0]) - (v0[1] - v2[1])*(u1[0] - u0[0]), (v0[1] - v1[1])*(u2[1] - u0[1]) - (v0[1] - v2[1])*(u1[1] - u0[1]), (v0[1] - v1[1])*(u2[2] - u0[2]) - (v0[1] - v2[1])*(u1[2] - u0[2]) ).scalarMultiply(1/((v0[0]*v1[1])-(v0[0]*v2[1])-(v1[0]*v0[1])+(v1[0]*v2[1])+(v2[0]*v0[1])-(v2[0]*v1[1]))); Vector3D imZ = new Vector3D(findEquation(u0, u1, u2)); Vector3D imY = Vector3D.crossProduct(imZ, imX); double[] imXn = imX.normalize().toArray(); double[] imYn = imY.normalize().toArray(); double[] imZn = imZ.normalize().toArray(); RealMatrix M = new Array2DRowRealMatrix(new double[][]{ {imXn[0], imXn[1], imXn[2], 0}, {imYn[0], imYn[1], imYn[2], 0}, {imZn[0], imZn[1], imZn[2], 0}, {0, 0, 0, 1} }); RealMatrix rotationMatrix = MatrixUtils.inverse(M2).multiply(M).multiply(M1); return rotationMatrix.getData(); } Method of Sam Hocevar static double[][] makeMatrix(double[] p1, double[] p2, double[] p3) { double[] v1 = normalize(difference(p2,p1)); double[] v2 = normalize(cross(difference(p3,p1), difference(p2,p1))); double[] v3 = cross(v1, v2); double[][] M = { { v1[0], v2[0], v3[0], p1[0] }, { v1[1], v2[1], v3[1], p1[1] }, { v1[2], v2[2], v3[2], p1[2] }, { 0.0, 0.0, 0.0, 1.0 } }; return M; } static double[][] createTransform(double[] A, double[] B, double[] C, double[] P, double[] Q, double[] R) { RealMatrix c = new Array2DRowRealMatrix(makeMatrix(A,B,C)); RealMatrix t = new Array2DRowRealMatrix(makeMatrix(P,Q,R)); return MatrixUtils.inverse(c).multiply(t).getData(); } The blue points are the calculated points. The black lines indicate the offset from the real position.

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• linux routing bug?

  - by Balázs Pozsár

  I have been struggling with this not easily reproducible issue since a while. I am using linux kernel v3.1.0, and sometimes routing to a few IP addresses does not work. What seems to happen is that instead of sending the packet to the gateway, the kernel treats the destination address as local, and tries to gets its MAC address via ARP. For example, now my current IP address is 172.16.1.104/24, the gateway is 172.16.1.254: # ifconfig eth0 eth0 Link encap:Ethernet HWaddr 00:1B:63:97:FC:DC inet addr:172.16.1.104 Bcast:172.16.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:230772 errors:0 dropped:0 overruns:0 frame:0 TX packets:171013 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:191879370 (182.9 Mb) TX bytes:47173253 (44.9 Mb) Interrupt:17 # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 172.16.1.254 0.0.0.0 UG 0 0 0 eth0 172.16.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0 I can ping a few addresses, but not 172.16.0.59: # ping -c1 172.16.1.254 PING 172.16.1.254 (172.16.1.254) 56(84) bytes of data. 64 bytes from 172.16.1.254: icmp_seq=1 ttl=64 time=0.383 ms --- 172.16.1.254 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.383/0.383/0.383/0.000 ms root@pozsybook:~# ping -c1 172.16.0.1 PING 172.16.0.1 (172.16.0.1) 56(84) bytes of data. 64 bytes from 172.16.0.1: icmp_seq=1 ttl=63 time=5.54 ms --- 172.16.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 5.545/5.545/5.545/0.000 ms root@pozsybook:~# ping -c1 172.16.0.2 PING 172.16.0.2 (172.16.0.2) 56(84) bytes of data. 64 bytes from 172.16.0.2: icmp_seq=1 ttl=62 time=7.92 ms --- 172.16.0.2 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 7.925/7.925/7.925/0.000 ms root@pozsybook:~# ping -c1 172.16.0.59 PING 172.16.0.59 (172.16.0.59) 56(84) bytes of data. From 172.16.1.104 icmp_seq=1 Destination Host Unreachable --- 172.16.0.59 ping statistics --- 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms When trying to ping 172.16.0.59, I can see in tcpdump that an ARP req was sent: # tcpdump -n -i eth0|grep ARP tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 15:25:16.671217 ARP, Request who-has 172.16.0.59 tell 172.16.1.104, length 28 and /proc/net/arp has an incomplete entry for 172.16.0.59: # grep 172.16.0.59 /proc/net/arp 172.16.0.59 0x1 0x0 00:00:00:00:00:00 * eth0 Please note, that 172.16.0.59 is accessible from this LAN from other computers. Does anyone have any idea of what's going on? Thanks. update: replies to the comments below: there are no interfaces besides eth0 and lo the ARP req cannot be seen on the other end, but that's how it should work. the main problem is that an ARP req should not even be sent at the first place the problem persist even if I add an explicit route with the command "route add -host 172.16.0.59 gw 172.16.1.254 dev eth0"

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• Présentation de Robot Operating System, par Jérôme Laplace

  Salut, je signale un nouvel article pour les programmeurs-roboticiens. Il s'agit d'un article d'introduction à ROS (Robot Operating System). ROS est le standard qui monte dans le monde de la robotique. Il est gratuit, open-source et robuste. Pour ceux qui souhaitent découvrir ou aller plus loin dans la robotique et après en intelligence artificielle, je pense que ça peut être une introduction utile. Cet article ne comporte pas de code, il présente les concepts. A lire donc avec de faire les tutoriaux... Présentation de Robot Operat...

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• How to do firmware updates/upgrades to a Blackberry

  - by Luis Alvarado

  I have several clients/friends that have Blackberry and wish to update their phone but without installing Windows. Any windows. Just doing it from Ubuntu. How can this be done. The update the mention is for the firmware and new programs for the phone. I do not know much about Blackberries since am more of an android guy. At the end they want support for upgrade/update the Blackberry from within Linux and sync it to the PC (Backups, upload/download stuff to and from it). I have seen 2 types of projects working on this: Linberry (From Venezuela ;) ) - http://linberry.webcindario.com/ Barry - http://www.netdirect.ca/software/packages/barry but so far neither offers updating the firmware or downloading updates. Are there any Ubuntu blackberry projects I am not aware of.

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• My Silverlight 4 talk at ConFoo Montreal

  Wednesday I did a Silverlight 4 talk at ConFoo (www.confoo.ca) very good conference in Montreal! As my public was mostly PHP dev I started by quickly introducing Silverlight, then showed several demos: Easy Painter: http://nokola.com/easypainter/ Physics Games: http://www.spritehand.com/ 3D: http://www.ingebrigtsen.info/silverlight/Balder/20100208/TestPage.html Bouncing Pane: http://weblogs.asp.net/lduveau/archive/2009/04/18/silverlight-3-the-amazing-bouncing-plane-demo.aspx ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Software bug/defect classification

  - by Dustin K

  We're trying to come up with terms that better describe our bugs/defects. To us, the term 'bug' or 'defect' is too generic and doesn't accurately reflect what is happening. For example, instead of saying that there is a bug (in the general sense), we'd rather say what type of bug (an error, or enhancement, or improvement, etc.). What names do you use for describing 'bugs'? I found http://www.softwaredevelopment.ca/bugs.shtml which has some pretty good classifications. How do you classify them?

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• Apple actualise la gamme MacBook Pro

  Apple a renouvelé sa gamme de MacBook Pro. Ce qu'il faut retenir : Le MacBook Pro 13" gagne encore en autonomie, pouvant atteindre jusqu'à 10 heures. Il possède un processeur graphique NVidia 320M inconnu au catalogue NVidia. Il semblerait que ce soit un processeur graphique fait spécialement par NVidia à la demande d'Apple. Les MacBook Pro 15" et 17" accueille les nouveaux (peut on encore dire nouveaux ?) processeurs Intel Core i5 et i7. Du coup, ils embarquent également le processeur graphique Intel HD qui ne vaut rien par rapport au processeur Nvidia qui équipait la génération précédente. Mais elle est secondée par une carte NVidia GT330M, présentée comme étant 2 fois plus puissante que la NVidia 320M. C'est surtout le fait qu'il ne faille plus rien faire pour basculer d'une carte graphique à l'autre. Et ça, c'est vraiment bien. Apple propose également, en option, une dalle de 1680*1050 sur le 15". Ce qui est une excellente chose.

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• What is the SEO impact of moving my domain to another IP address and what is the right way of doing this?

  - by ElHaix

  I am planning to move several websites to a new hosting provider - keeping the same URL but will resolve to different IP addresses. For example, some sites are Canadian content-only sites, hosted on .CA domains sitting on Canadian IP addresses. I want to move these to Amazon servers which have US IP addresses. The domain names will remain the same. (1) What is the SEO impact of this? (2) Will the site lose some ranking if the sites are moved to a new IP address (Canadian or not), and if so, what is the cleanest way of accomplishing this (some kind of 301's)?

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• PRISM : la France aurait-elle dû accueillir Edward Snowden ? Une demande soutenue par les Verts, le Parti de Gauche et le Front National

  PRISM : la France aurait-elle dû accueillir Edward Snowden ? Une demande soutenue par les Verts, le Parti de Gauche et le Front NationalLe moins que l'on puisse dire, c'est que la classe politique française a assez peu apprécié les révélations du Spiegel sur l'espionnage par les États-Unis de ses alliés européens. Et encore moins les tentatives du secrétaire d'État américain John Kerry et du Président Barack Obama de relativiser à outrance les faits pour désamorcer l'affaire.Si certains jouent la carte du recul (comme Fleur Pellerin pour qui « ce n'est pas vraiment la première fois que ça arrive dans l'Histoire » ou Henry Guaino qui...

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• OpenWorld 2011 Call for Papers: Deadline March 27

  - by antonio romero

  OpenWorld 2011 is now open for the public to submit session proposals. We would like to encourage our customers, and partners to participate in this ‘call for papers” (CFP) process. CFP for the general public, non-Oracle employee submitters, closes on March 27, 2011. Please share the information provided below with your contacts. General Information Conference Location: Moscone Convention Center, San Francisco, CA. Conference Date: Sunday - Thursday, October 2 - 6, 2011 Conference Website: http://www.oracle.com/us/openworld CFP Website: https://oracleus.wingateweb.com/portal/cfp/ Paper submission key dates: Deliverables Due Dates Call for Papers Begins Wednesday, March 9 Call for Papers Ends Sunday, March 27 – 11:59 pm PDT Notifications for Accepted and Declined Submissions Sent End of May Questions regarding the Call for Papers, send an email to [email protected]

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• Save the Date for the Oracle Storage Community Forum at Oracle OpenWorld

  - by Ritu Chhibber-Oracle

  Dear Partners, Come and meet Oracle's Top Storage Executives, Architects and Fellow Customers & Partners at the Oracle Storage Community Forum at Oracle OpenWorld on October 1, 2014. This special event will feature interactive sessions on Oracle's Application Engineered Storage strategy, product directions, and real-world customer implementations. Discover the possibilities, as only Oracle can co-engineer hardware with Oracle Database and applications to deliver extreme performance, dynamic automation, management efficiency and cost savings. Storage Forum at Oracle OpenWorld Wednesday, October 1, 20143:30 p.m. - 5:00 p.m. Forum5:00 p.m. - 6:00 p.m. Reception Venue:Metreon – City View135 Fourth Street, Suite 4000,San Francisco, CA 94103 For more details and to register, please click here.

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• Building TrueCrypt on Ubuntu 13.10

  - by linuxubuntu

  With the whole NSA thing people tried to re-build identically looking binaries to the ones which truecrypt.org provides, but didn't succeed. So some think they might be compiled with back-doors which are not in the source code. - So how compile on the latest Ubuntu version (I'm using UbuntuGNOME but that shouldn't matter)? I tried some tutorials for previous Ubuntu versions but they seem not to work any-more? edit: https://madiba.encs.concordia.ca/~x_decarn/truecrypt-binaries-analysis/ Now you might think "ok, we don't need to build", but: To build he used closed-source software and there are proof-of-concepts where a compromised compiler still put backdoors into the binary: 1. source without backdoors 2. binary identically to the reference-binary 3. binary contains still backdoors

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• Les Techn'Oracle Et Les Sales'Oracle Sont Là !

  - by swalker

  Les Techn'Oracle et les Sales'Oracle sont lancées en région. Comme chaque année, plusieurs centaines de collaborateurs de nos Partenaires vont se former sur nos offres et nos produits les plus récents ! Les Techn'Oracle visent à présenter le contenu technique de nos produits, et leurs avantages pour les Clients, en terme d'architecture, de TCO, de flexibilité pour les Systèmes d'Information. Les Sales'Oracle ont pour objet de montrer la valeur de nos offres en termes Clients, le "à quoi ça sert" pour permettre aux Partenaires d'augmenter leur présence et leurs revenus chez nos Clients >> Rendez-vous sur le Calendrier pour les dates et les thèmes ici

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• Vancouver .NET User Group

  - by pluginbaby

  While in Vancouver for my Silverlight training in early May, I will give a free Silverlight presentation at the local .NET User Group, .netBC. When: May 5, 2010, 6:30 PM Where: Building SW3 room 1750, BCIT Burnaby Campus, 3700 Willingdon Ave, Burnaby, BC, V5G 3H2 What: Silverlight 4 Business Applications “In this session a live demo will be built to show the new features of Silverlight 4 that helps you create business-oriented applications easier than ever. Importing/exporting data, printing, drag drop target, data visualization, context menu, WCF RIA Services and design-time enhancements in Visual Studio 2010.” Read all the details here: http://www.netbc.ca/DNCal/EventDetail.aspx?date=2010/05/05 See you there!   Thanks Telerik for helping this event to happen!   Technorati Tags: Silverlight,Silverlight Training

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• Adsense block not displaying anything

  - by Mild Fuzz

  I have copied and pasted the following code into my page, but it seems to be having no effect. It should have a fall back block colour, but nothing is showing. Code copied/pasted straight from google <script type="text/javascript"><!-- google_ad_client = "ca-pub-7972043490779920"; /* SALF */ google_ad_slot = "4085311300"; google_ad_width = 300; google_ad_height = 250; //--> </script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script>

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• Should I put an app I wrote on my résumé even if it has low ratings?

  - by charliehorse55

  Last summer I wrote an iPhone app for the Toronto Film Festival. The development was pretty rushed, and the design goals were changed multiple times. In particular, the central film list view controller was redesigned three times in the week before launch. I forgot to update one of my functions to match the changed design, and the app shipped with a serious bug. While the app was fairly popular, this bug crippled the app and it got a lot of poor reviews. I fixed the bug as soon as I got a crash report, but it got stuck in the iTunes review process for the duration of the film festival. Should I put this app on my résumé? The app has poor ratings and most of the reviews mention crashes, but it's also the only work experience I have. Additionally, how should I approach this topic in an interview? Here is the iTunes link for the app: https://itunes.apple.com/ca/app/official-tiff/id550151899?mt=8

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• Computer Networks UNISA - Chap 8 &ndash; Wireless Networking

  - by MarkPearl

  After reading this section you should be able to Explain how nodes exchange wireless signals Identify potential obstacles to successful transmission and their repercussions, such as interference and reflection Understand WLAN architecture Specify the characteristics of popular WLAN transmission methods including 802.11 a/b/g/n Install and configure wireless access points and their clients Describe wireless MAN and WAN technologies, including 802.16 and satellite communications The Wireless Spectrum All wireless signals are carried through the air by electromagnetic waves. The wireless spectrum is a continuum of the electromagnetic waves used for data and voice communication. The wireless spectrum falls between 9KHZ and 300 GHZ. Characteristics of Wireless Transmission Antennas Each type of wireless service requires an antenna specifically designed for that service. The service’s specification determine the antenna’s power output, frequency, and radiation pattern. A directional antenna issues wireless signals along a single direction. An omnidirectional antenna issues and receives wireless signals with equal strength and clarity in all directions The geographical area that an antenna or wireless system can reach is known as its range Signal Propagation LOS (line of sight) uses the least amount of energy and results in the reception of the clearest possible signal. When there is an obstacle in the way, the signal may… pass through the object or be obsrobed by the object or may be subject to reflection, diffraction or scattering. Reflection – waves encounter an object and bounces off it. Diffraction – signal splits into secondary waves when it encounters an obstruction Scattering – is the diffusion or the reflection in multiple different directions of a signal Signal Degradation Fading occurs as a signal hits various objects. Because of fading, the strength of the signal that reaches the receiver is lower than the transmitted signal strength. The further a signal moves from its source, the weaker it gets (this is called attenuation) Signals are also affected by noise – the electromagnetic interference) Interference can distort and weaken a wireless signal in the same way that noise distorts and weakens a wired signal. Frequency Ranges Older wireless devices used the 2.4 GHZ band to send and receive signals. This had 11 communication channels that are unlicensed. Newer wireless devices can also use the 5 GHZ band which has 24 unlicensed bands Narrowband, Broadband, and Spread Spectrum Signals Narrowband – a transmitter concentrates the signal energy at a single frequency or in a very small range of frequencies Broadband – uses a relatively wide band of the wireless spectrum and offers higher throughputs than narrowband technologies The use of multiple frequencies to transmit a signal is known as spread-spectrum technology. In other words a signal never stays continuously within one frequency range during its transmission. One specific implementation of spread spectrum is FHSS (frequency hoping spread spectrum). Another type is known as DSS (direct sequence spread spectrum) Fixed vs. Mobile Each type of wireless communication falls into one of two categories Fixed – the location of the transmitted and receiver do not move (results in energy saved because weaker signal strength is possible with directional antennas) Mobile – the location can change WLAN (Wireless LAN) Architecture There are two main types of arrangements Adhoc – data is sent directly between devices – good for small local devices Infrastructure mode – a wireless access point is placed centrally, that all devices connect with 802.11 WLANs The most popular wireless standards used on contemporary LANs are those developed by IEEE’s 802.11 committee. Over the years several distinct standards related to wireless networking have been released. Four of the best known standards are also referred to as Wi-Fi. They are…. 802.11b 802.11a 802.11g 802.11n These four standards share many characteristics. i.e. All 4 use half duplex signalling Follow the same access method Access Method 802.11 standards specify the use of CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) to access a shared medium. Using CSMA/CA before a station begins to send data on an 802.11 network, it checks for existing wireless transmissions. If the source node detects no transmission activity on the network, it waits a brief period of time and then sends its transmission. If the source does detect activity, it waits a brief period of time before checking again. The destination node receives the transmission and, after verifying its accuracy, issues an acknowledgement (ACT) packet to the source. If the source receives the ACK it assumes the transmission was successful, – if it does not receive an ACK it assumes the transmission failed and sends it again. Association Two types of scanning… Active – station transmits a special frame, known as a prove, on all available channels within its frequency range. When an access point finds the probe frame, it issues a probe response. Passive – wireless station listens on all channels within its frequency range for a special signal, known as a beacon frame, issued from an access point – the beacon frame contains information necessary to connect to the point. Re-association occurs when a mobile user moves out of one access point’s range and into the range of another. Frames Read page 378 – 381 about frames and specific 802.11 protocols Bluetooth Networks Sony Ericson originally invented the Bluetooth technology in the early 1990s. In 1998 other manufacturers joined Ericsson in the Special Interest Group (SIG) whose aim was to refine and standardize the technology. Bluetooth was designed to be used on small networks composed of personal communications devices. It has become popular wireless technology for communicating among cellular telephones, phone headsets, etc. Wireless WANs and Internet Access Refer to pages 396 – 402 of the textbook for details.

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• Ubuntu Server SHH backspace Bad Character

  - by Edwin Lunando

  so while while I'm using SSH to connect my server the backspace shows me bad character. The backspace is the one with question mark. The backspace itself works normally, but in the screen, it wasn't very neat to look stacking question mark. This is the example. The square-bracketed question mark means backspace. cat[?] output: ca: not found cat[?][?] output: c:not found cat[?][?][?] output: nothing, because it simple delete the 3 character. Please help. Thank you.

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• Google dévoile enfin Android 3.0 Honeycomb, dans lequel "tout est pensé pour les tablettes"

  Google dévoile enfin Android 3.0 Honeycomb, dans lequel "tout est pensé pour les tablettes" Depuis le temps qu'on en parlait, le voilà ! Google vient de présenter officiellement Honeycomb, la nouvelle mouture d'Android, lors d'un évènement spécial. Cette session était diffusée en streaming live sur le Web, ce qui nous a permis de la suivre en direct, dès son commencement à 19 heures (heure française). Android 3.0 est surtout attendu parce qu'il est adapté aux tablettes tactiles, son principe étant en effet de simplifier à l'extrême l'utilisation des appareils mobiles, en accédant à leurs différentes fonctions le plus facilement et directement possible. Et ça se sent dès l'écran d'accueil, qui...

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• Glume super amuzante

  - by haioase

  Un ardelean si un lepros stau in inchisoare. La un moment dat, leprosului ii cade o ureche... o ia si o arunca pe geam. Dupa un timp, leprosului ii cade nasul... il ia si il arunca pe geam. Dupa un timp, leprosului ii cade un deget... il ia si il arunca pe geam... Ardeleanul nu mai suporta: -No, dupa cum bag de sama, 'mneata vrei sa evadezi!– Nu va suparati, ce se da aici? - Nu stiu, domnule, stai sa întrebam. Întrebarea circula pâna la primul din rând. - Nu stiu. Mi s-a facut rau si m-am sprijinit de zid. Când mi-am revenit, era deja coada în spatele meu. - De ce nu pleci atunci? - Pai, acum ca sunt primu...

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• Alternative to Google Adsense which has good international coverage

  - by Yoga

  I have a technical blog (programming related) which has around 500 visit per days, 70% are international visitors and 30% are from US/CA. Google Adsense disabled my account due to invalid clicks so I can't use them (no need to explain here, they suck hard and never respect and listen to the publishers' appeal) I have tried adbrite and recently using chitika but they almost give me nothing, e.g. chitika 13,865 Page Views 4 clicks $0.01 The performance is so poor even I don't want to mention about it. I am already putting a full top banner and a 350x200 box in article body. I am researching if any alternative would provide more revenue for my internation visitors or technical visitors. Thanks.

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• Google ne censure plus ses résultats en Chine, comment va réagir le gouvernement de Pékin ?

  Mise à jour du 22.03.2010 par Katleen Google ne censure plus ses résultats en Chine, comment va réagir le gouvernement de Pékin ? Ca y est, Google a franchi le pas. Comme nous vous l'annoncions vendredi, Google a officiellement pris position ce lundi. L'entreprise a cessé de censurer les résultats de ses recherches en Chine. Dès à présent, les internautes chinois qui se connectent sur Google.cn sont automatiquement redirigés vers Google.com.hk, le site de Hong Kong, comme l'a expliqué ce matin le directeur juridique David Drummond : «Aujourd'hui nous avons cessé de censurer nos services de recherches ?Google Search, Google News et Google Images sur Google.cn. Les internautes visitant Google.cn...

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• 14.04 default locales

  - by Seán Ó Séaghdha

  After a new install of 14.04 I have quite a few extra locales/languages. Is this normal? I installed using English (GB) I think since en_AU isn't an option. At some point apt offered a list of unused files which I removed. Now when I open Language Support it warns me that "Language support is not installed completely" and offers to reinstall this list... kde-l10n-zhcn thunderbird-locale-en-gb thunderbird-locale-es libreoffice-l10n-en-gb libreoffice-help-es libreoffice-help-en-gb wspanish thunderbird-locale-zh-cn myspell-es ibus-sunpinyin mythes-en-au kde-l10n-es libreoffice-l10n-zh-cn fonts-arphic-uming ibus-table-wubi thunderbird-locale-es-es thunderbird-locale-zh-hans libreoffice-l10n-en-za thunderbird-locale-es-ar hunspell-en-ca libreoffice-l10n-es libreoffice-help-zh-cn kde-l10n-engb fonts-arphic-ukai So are Spanish and Chinese installed by default in all installations now? Why do I need Canadian English spellchecking installed?

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• A good course on HTML/CSS/JS/UX worth it in part time?

  - by zengr

  I am a java/ruby developer from the last 3yrs, trying my hands on JS now. I am fascinated by the awesome UI designs these days. Any app I make, the worst aspect is the UI and I suck at it. I end up copying a design and with a crappy one. I am a student in San Jose, CA, and will be working from next month on Java most probably. My questions are: Are there any good courses (in the the colleges in silicon valley) on web Design (Photoshop), html, css, JS? Is it worth it?

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