wireless optical communications systems in enterprise networks

Ngày tải lên: 23/06/2014, 00:20

... Maximal ratio combining and equal gain combining both use more than one path in two distinct ways. In maximal ratio combining each branch signal is weighted (by a k ) in proportion to its ... the time being. In general there are three methods for processing these signals. Known as linear combiners they are selection diversity, maximal ratio combining, and equal gain combining. Under ... co-phasing of the signals. Conversely, equal gain combining does not weight each signal before combining (all a k = 1). In general, maximal ratio combining provides the best performance gain,...

Ngày tải lên: 20/11/2012, 11:36

... less intentionally. The concept of creating, coding, storing, distributing, exchanging, integrating, and using knowledge in organizations is not new, but management practice is becoming increasingly ... authoring of information (incl., for example, applications like statistical analysis and data mining tools).  Communication tools, including, for example, e-mail, bulletin boards, instant messaging, ... A CONCEPTUALIZATION Using existing theories, this section presents our conceptualization of knowledge managing within the context of inter-organizational networks. Our epistemological starting point is in business...

Ngày tải lên: 24/01/2014, 00:20

... determining I and Q values for each symbol (“slicing”) 5. decoding and de-interleaving 6. expansion to original bit stream 7. digital-to-analog conversion, if required In more and more systems, ... 13. Frequency Shift Keying 6.5 Combining multiplexing modes In most of these common communications systems, different forms of multiplexing are generally combined. For example, GSM uses FDMA, TDMA, ... 2. Trends in the Industry The polar diagram shows several symbols at a time. That is, it shows the instantaneous value of the carrier at any point on the continuous line between and including symbol...

Ngày tải lên: 26/01/2014, 04:20

Ngày tải lên: 31/03/2014, 07:20

Ngày tải lên: 31/05/2014, 01:15

Ngày tải lên: 22/06/2014, 22:20

Ngày tải lên: 25/06/2014, 00:55

Ngày tải lên: 27/06/2014, 01:21

... truyền tin, sẽ có một nguồn phát hay nguồn tin(information source) mà nguồn phát này phát ra thông tin dưới một vài hình thức, và một nguồn thu hay nguồn nhận (information sink) thu về thông tin. ... sách “Principles of Digital Communication Systems and Computer Networks của nhóm em. Phần I – Các hệ thống truyền thông số (Digital Communation System) Chương 2: Lý Thuyết Thông Tin (Information ... truyền thông tin là kết nối trung gian giữa nguồn thu và nguồn phát.Mục đích của một hệ thống truyền tin là để truyền tin từ nguồn đến đích mà không có lỗi. Tuy nhiên, sự truyền thông tin luôn luôn...

Ngày tải lên: 18/09/2012, 10:13

... the fuel fills the injection pump, it lubricates and cools the moving parts in the injection pump. After the fuel is pressurized, it is injected into the engine cylinder by the injection nozzle. ... the engine with the ECD-V4 has been improved (by atomizing the fuel into finer particles and optimizing the rise rate of the injection pressure), and providing the injection volume and injection ... direct-acting valve. The V4 direct-injection diesel fuel injection system for small trucks and SUVs appeared in 1998. The V4 system, which uses an inner cam pumping mechanism, enables high-pressure injection...

Ngày tải lên: 23/10/2012, 09:09

... serous chorioretinopathy [1]. OCT measurements of retinal thickness have a good reproducibility as demon- strated in repeated examinations. The main applica- tion of OCT in inflammatory eye ... Ivyspring International Publisher. All rights reserved Short Communication Optical Coherence Tomography in ocular toxoplasmosis Dominique Monnet, Kristel Averous, Emmanuelle Delair, Antoine ... retinochoroiditis. Ac- tive lesions were observed in 16 subjects and scarred lesions in 9 subjects. Active areas appeared as hyper- reflective images, which were localized in the retina in 15...

Ngày tải lên: 03/11/2012, 11:01

Ngày tải lên: 02/03/2013, 16:57

... flows sending large packets get more l cost of flow classification Queue Management 3 Improving QOS in IP Networks o IETF groups are working on proposals to provide better QOS control in IP networks, ... policing) o More details in Network Calculus course Queue Management 2 Contents o Principles o Traffic shaping l leaky bucket l token bucket o Scheduling strategies l FIFO l Priority l Round Robin l ... dropped queue transmission packets Queue Management 20 Fair Queueing o Round robin "bit per bit" l each packet marked with the transmission instant of the last bit l served in the order of instants flow 1 flow 2 flow 3 temps Queue...

Ngày tải lên: 06/04/2013, 11:05

Ngày tải lên: 12/05/2013, 10:21

... latrine Households using sanitary latrine Households using unsanitary latrine Households using no latrine at all Hand washing with soap before eating Hand washi ng without s oap before eating No hand washing ... types of inundation (rainy, stagnant-water, heavy-rainy, monsoon-flood and drainage-water inundations). Ten sub- districts were selected by integrating information regarding water logging for ... children defecating in verandah Households with children defecating in latrine Family members ≥7   Households with children defecating in latrine   Fig. 2 - Household survey findings for (a) family...

Ngày tải lên: 05/09/2013, 10:15

Ngày tải lên: 05/09/2013, 15:28

... keep in mind before choosing a cascaded approach, even though it works best in high take rate situations. For example, MSOs might be building that same subdivision to offer voice services, diluting ... loss (ORL); and link mapping or characterization via OTDR trace development. These tests require certain network features for adequate data collection, including a well-defined path that can ... which optical splitter approach will work best. Since today’s optical line terminal (OLT) card can service a maximum of 32 customers, it is important to ensure efficient use of each card. In large...

Ngày tải lên: 16/10/2013, 05:15

... packet transmitted in mini-cycle i is received in mini-cycle (i+1) and increases cwnd by one MSS. Further- more, ACKs for consecutive packets released in mini-cycle i arrive in intervals corresponding the service ... reception rate by not joining any enhancement layers. The reception rate of the receivers can be maintained by periodically joining layers. The reception rate may be increased by joining additional layers ... (OSPF) link state protocol. It uses Internet Group Management Protocol (IGMP) to monitor and maintain group memberships within the domain and OSPF link state advertisements to maintain a view...

Ngày tải lên: 26/10/2013, 17:15

... It includes the following topics: • Overview • Configuring the DHCP Client • Releasing and Renewing the DHCP Lease • Monitoring and Debugging the DHCP Client Overview DHCP client support within ... Guide 78-13943-01 Chapter 5 Using PIX Firewall in SOHO Networks Using the PIX Firewall DHCP Client Releasing and Renewing the DHCP Lease To view current information about the DHCP lease, enter the following command: show ... will use by entering the following command: dhcpd domain example.com 5-5 Cisco PIX Firewall and VPN Configuration Guide 78-13943-01 Chapter 5 Using PIX Firewall in SOHO Networks Using the PIX Firewall...

Ngày tải lên: 27/10/2013, 07:15