Optical Time Division Multiplexing Technology

By Frbiz Tian

Optical time division multiplexing (TDM) technology is a high-speed transmission technology (up to 100Gb / s), it uses very narrow pulses have a greater bandwidth, more efficient use of optical fiber spectrum. TDM will slip stream of light directly into the optical domain multiplexing, resulting in the synthesis of very high bit rate data stream. TDM allows multiple signals simultaneously access to the same fibers, but the realization method of TDM and WDM is entirely different.

TDM can be used to achieve a single light 40Gb / s over rate.

The light source (such as mode-locked laser) produces a series of very narrow optical pulses into N-zero data stream, N a data stream for each channel signal by XGb / s (such as STM-n) respectively, the slip signal modulation, delay one clock cycle, and then by multiplexing the data resulting from the total rate of (N X) Gb / s.

Present study shows that, TDM overall rate of up to 200Gb / s or higher. Are running at such high speed optical transmission system, the fiber dispersion is a very important issue, generally use two methods to resolve, one is to use dispersion management (through the use of dispersion compensation fiber), bringing the total of the dispersion Jie Jin to zero; Another way is to use soliton transmission. Soliton transmission technology must be carefully considered signal power and pulse shape, and compression using self-phase modulation of the dispersion effect to solve the problem. Therefore, TDM is to support long-distance, high-capacity transmission better technical solutions.

Since the 90s since the 20th century, the United States, Britain, Japan and other countries some of the research carried out on the TDM system, extensive research and have made great progress.

[youtube]http://www.youtube.com/watch?v=n-sgVVTE9Io[/youtube]

Used in optical transmission network TDM, must consider the synchronization problem, not only have to consider synchronization in time domain, frequency domain synchronization.

That is, for TDM networks, through various channels to reach any node to synchronize the pulse sequences needed to ensure the accurate demultiplexing, while they have the same spectral characteristics needed to ensure that when the data is handed to the network of another node, with zero offset between them. TDM networks for large-scale major difficulty has been inserted into the data path and data path of the optical-line properties match, a possible solution is to use a single distribution in the network to send laser signals.

TDM high-speed optical communication system is composed of ultra-short pulse light source, optical time division multiplexing / de-multiplexing equipment, optical clock recovery and synchronization, optical receivers, and optical fiber components.

TDM system requirements to produce high repetition rate light source, small super narrow pulse duty ratio. The more narrow width of the large ones can be reused more bandwidth, the more wide. Sources to meet these requirements mainly locked ring laser, mode-locked semiconductor lasers.

TDM time-division multiplexing optical transmission system technology easier to achieve, and optical demultiplexing up difficult to achieve. Optical demultiplexing TDM requirements are: fast and stable work without error, control, low power, polarization independent, timing jitter is small. Currently the main use of optical fiber nonlinear optical loop mirror (NOLM – based on semiconductor laser amplifier loop mirrors) and FWM (four wave mixing) two demultiplexer demultiplexing.

Extracted from the TDM clock signal system is very important. At present, the main optical clock extraction circuit resonance, injection mode-locked semiconductor laser and phase-locked loop (PLL), etc. The more mature the PLL.

In order to achieve a drop multiplexing function of optical networks, in addition to the clock extraction, but also need to frame and channel calibration. In the optical transmission network, the environmental impact, will produce jitter and drift, so these systems will require precise alignment and channel phase control.

TDM is a realization of a powerful high-capacity high-speed transmission technology, it can effective use of optical wavelength, and can run at different distances and capacity of the network. TDM can also use non-linear soliton transmission, and a host of other technologies, high-speed transmission systems to eliminate the dispersion effects. With the large-scale integration technology, such as InP and silicon planar waveguide technology and semiconductor optical amplification technology, TDM technology will make significant progress and into the practical.

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Wikinews interviews Rocky De La Fuente, U.S. Democratic Party presidential candidate

Thursday, March 31, 2016

Businessman Rocky De La Fuente took some time to speak with Wikinews about his campaign for the U.S. Democratic Party’s 2016 presidential nomination.

The 61-year-old De La Fuente resides in San Diego, California, grew up in Tijuana, and owns multiple businesses and properties throughout the world. Since getting his start in the automobile industry, De La Fuente has branched out into the banking and real estate markets. Despite not having held or sought political office previously, he has been involved in politics, serving as the first-ever Hispanic superdelegate to the 1992 Democratic National Convention.

De La Fuente entered the 2016 presidential race last October largely due to his dissatisfaction with Republican front-runner Donald Trump. He argues he is a more accomplished businessman than Trump, and attacks Trump as “a clown,” “a joke,” “dangerous,” and “in the same category as Hitler.” Nevertheless, De La Fuente’s business background begets comparisons with Trump. The Alaskan Midnight Sun blog described him as the Democrats’ “own Donald Trump.”

While receiving only minimal media coverage, he has campaigned actively, and according to the latest Federal Election Commission filing, loaned almost US$ 4 million of his own money to the campaign. He has qualified for 48 primary and caucus ballots, but has not yet obtained any delegates to the 2016 Democratic National Convention. Thus far, according to the count at The Green Papers, De La Fuente has received 35,406 votes, or 0.23% of the total votes cast. He leads among the many lesser-known candidates but trails both Senator Bernie Sanders who has received nearly 6.5 million votes and front-runner Hillary Clinton who has just shy of 9 million votes.

With Wikinews reporter William S. Saturn?, De La Fuente discusses his personal background, his positions on political issues, his current campaign for president, and his political future.

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Study: Fish reduces Alzheimer’s disease risk

Wednesday, November 30, 2011

Consumption of grilled or baked fish at least once a week can preserve the brain structure of seniors and reduce the risk of developing Alzheimer’s disease by three to five times, according to the results of a recent US study.

The study, conducted by the University of Pittsburgh School of Medicine in Pennsylvania, asked 260 volunteers with an average age of 76, about the frequency of their fish consumption. Ten years later, brain scans were carried out on those being researched. Those who regularly ate fish were found to have better preservation of parts of the brain related to memory. An additional five years later, 31% of those who did not regularly consume fish contracted mild cognitive impairment or Alzheimer’s disease. Of those who ate fish at least once a week, between three and eight per cent contracted the aforementioned medical conditions.

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According to The Daily Telegraph, consumption of grilled or baked fish increases the intake of Omega 3 fatty acids, providing a greater amount of blood flow to the brain; therefore prompting a reduction in inflammation and internal gathering of plaque encountered in the lead-up to Alzheimer’s disease. Fried fish does not reduce the risk of contracting Alzheimer’s disease due to the low amount of Omega 3 it contains.

Dr. Cyrus Raji, who took leadership of the study, called it “the first study to establish a direct relationship between fish consumption, brain structure and Alzheimer’s risk.” Raji concluded that “people who consumed baked or [grilled] fish at least one time per week had better preservation of grey matter volume on MRI in brain areas at risk for Alzheimer’s disease.”

The Alzheimer’s Society’s research manager, Dr. Anne Corbett, stated: “This moderately sized study adds weight to existing evidence suggesting that eating fish reduces your risk of developing cognitive decline.” However, she contested these findings, saying they “did not account for lifestyle factors such as other foods or exercise”, which may have affected the overall outcome. Dr. Corbett advised consumers to “eat a healthy diet including fruit and vegetables along with taking regular exercise and giving up smoking” to reduce the risk of contracting dementia.

Meanwhile, Alzheimer’s Research UK lead researcher, Dr. Simon Ridley, believed the study had not clarified “whether other underlying factors may have contributed to the lower risk in people who eat fish.” There is “a clear need for more conclusive research into the effects of dietary fish on our cognitive health,” according to Dr. Ridley.

The results of the study are to be presented today at the annual meeting of the Radiological Society of North America.

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Fall ’08 styles at New York Fashion Week: rock ‘n’ roll is here to stay

Monday, February 4, 2008

The third day of New York Fashion Week debuted styles infused in ’70s couture, punk and hard rock roots. Labels Herve Leger, DKNY and Rock & Republic unveiled their Fall 2008 lines, and continued the retro bent popular in the first two days of the world’s largest fashion show.

Max Azria’s Herve Leger label showed off his signature skintight dress in multiple styles Sunday, experimenting with knit fabric as well as coats to complement the dress. Unafraid to take risks, Azria also unveiled elaborate variations which called for sequins, ribbons and large bows, the latter of which was another nod to late ’70s fashion. Model Padma Lakshmi walked the runway for Azria, as did actress Sophia Bush and singers Joss Stone and Mandy Moore.

DKNY, the main label for designer Donna Karan, took the idea of ’70s couture and modernized it, deeming her Fall collection “eclectic glamour.” Retro styles such as bow blouses, pants bordering on the bell-bottom design, and peasant fashions were interspersed with more modern knits, silk and plaid designs for tops, dresses and jackets, respectively.

Rock & Republic’s theme was “gangster chic,” and was the biggest contributor to the hard rock feel. Unlike most shows, a complete orchestra with baby grand piano set the soundtrack for the show, which unveiled designs almost exclusively in a somber black. Designer David Cardona was credited with the rock designs, which included black suits and trenchcoats, and are a departure from the high-end denim looks the label is usually known for.

New York Fashion Week runs until Friday. On Monday Carolina Herrera and Betsey Johnson are considered to be the biggest draws at Bryant Park.

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Work With An Attorney For Family Law In Oxford, Ms

byAlma Abell

It is common for many people to go their entire adult lives without ever needing to see the inside of a courtroom for any kind of criminal case. When it comes to the civil courts, there are many more situations that can arise, leading someone to seek the advice and representation of an attorney for their matter.

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Lawyers who work in the area of Family Law Oxford are available for people who have life situations that will benefit from the services of a legal professional. Divorces, child custody cases, adoptions, surrogacy matters and domestic partnerships are all things that require the expertise and the knowledge that an attorney can provide.

In legal cases where there are two sides, such as child custody or divorce, it is always an advantage to retain legal representation to guide you through the process of your case. If the other side is represented, then your own attorney who is familiar with Family Law in Oxford, MS can counter anything that comes from the other side with the response that best represents your own interests and goals for the outcome of the case.

The local courts are a place that attorneys who regularly practice in that area of law are familiar with. Those who have many clients who need services for matters of Family Law in Oxford, MS are well versed in the judges and the methods used by the courts in handling cases that new clients can bring them. This local court familiarity often proves to be beneficial to their clients, allowing the lawyer to schedule return dates and other court related matters for their client in a way that may benefit their goals when possible.

Family law courts are often emotional places. Great joy is felt by those who are going to court for an adoption, and there can be happiness and joy for the clients who need their lawyer for surrogacy matters as well. Still other matters carry a more difficult emotional burden, one of pain and possibly adversarial overtones between the parties. Divorces and child custody cases handled by attorneys for Family Law in Oxford, MS can be more professionally processed when a dispassionate and focused lawyer is guiding the process.

Parts of internet break as ‘512k day’ reached by routers

Thursday, August 14, 2014

On Tuesday many internet routers, used to find the pathways to different parts of the web, reached their memory limit of 512,000 entries in the tables they use to store the routes, causing problems for many users.

A router is used to direct a user towards the area of the internet where they will find the content they are looking for, e.g. a web page. The recent problem was caused by the arbitrary memory limit built into the design of many aging routers. A limit was needed to prevent the cost of hardware from becoming prohibitively expensive in the days when physical data storage was still comparatively expensive. This small amount of memory in turn limits the number of directions which can be stored on a single router leading to different parts of the internet. When this limit was reached, it caused outages of services among Internet Service Providers. Many routers, including older ones provided by Cisco Systems Inc., are limited to storing a total of 512,000 routes or paths.

This limit was reached on Tuesday, reported to have been triggered by Verizon publishing another 15,000 paths. Those affected included eBay, LastPass, and clients of the web hosting company Liquid Web, who lost much of their services until Verizon withdrew some of these new paths. Problems nevertheless continued throughout the day, even after the withdrawal.

A longer term fix is possible, but it would require manually replacing old routers with newer, more capable ones. It is hard to tell what issues would temporarily cascade though the internet by taking down routers from part of the internet for maintenance. Many experts have warned that problems could continue until these difficult fixes have been implemented, although the recent switch to a newer form of IP Addresses, IPv6, will temporarily help the issue. Wired News reported that Andre Toonk, a network engineer, had stated that the number of network outages on the internet, typically around 1,500, yesterday peaked at 2,587, enough to become clearly noticeable.

Retrieved from “https://en.wikinews.org/w/index.php?title=Parts_of_internet_break_as_%27512k_day%27_reached_by_routers&oldid=2825748”

Medical Simulation Market Research Report

Medical Simulation Market:

The GMI Research expects the medical simulation market to expand at a significant rate. From a regional perspective, North America is projected to dominate the market due to the rising emphasis of medical institutes and hospitals on standardizing their practices to improve patient safety. Moreover, economies like the US have experienced an increase in the demand for minimally invasive treatments.

Request for a FREE Sample Report on Medical Simulation Market

Medical Simulation Market Dynamics (including market size, share, trends, forecast, growth, forecast, and industry analysis) Key Drivers

The growing emphasis on patient safety, the strong demand for minimally invasive treatments, the rising requirement for virtual training owing to the rising presence of the COVID-19 pandemic, and the benefits of simulation over traditional learning are the prominent factors surging the growth of the global medical simulation market size. Patient safety, such as patients reported problems, communication, organization safety culture, and prescribing and diagnostic safety. With the outbreak of evolving complexity in healthcare systems and the growing number of patient harm in health care facilities, health care organizations or hospitals are raising their emphasis on patient safety. An important strategy for health care systems is simulation training which helps to improve patient safety. The major strength of simulation training is suitability for multidisciplinary team training. It enhances team self-efficiency, the competence of mankind, and provider. The rapid technological advancements in technologies help the simulation method to offer practical training for numerous surgical and interventional procedures. All these usages of simulation technology aid in offering improve treatment to patients instead of the traditional methodology. On the other hand, the factor hindering the growth of the medical simulation market include the need for advanced technologies, which lead to increased cost.

Product and Services Segment Drivers

Based on product and services, the market is segmented into anatomical models, web-based simulation, medical simulation software, and simulation training services. The anatomical model is projected to increase at a faster rate in the upcoming years due to the high adoption of technology in academics, military organizations, and training & practicing.

Medical Simulation Market’s leading Manufacturers:

  • CAE Inc
  • Laerdal Medical Ltd
  • 3D Systems, Inc
  • Simulab Corporation
  • Limbs & Things Ltd
  • Kyoto Kagaku Co. Ltd
  • Mentice AB
  • Surgical Science Sweden AB
  • Gaumard Scientific Company, Inc.
  • Simulaids Inc

Medical Simulation Market Segmentation: Segmentation by Product & Service:

  • Anatomical Models
    • Patient Simulators
      • High-Fidelity Simulators
      • Medium Fidelity Simulators
      • Low Fidelity Simulators
    • Task Trainers
    • Interventional/Surgical Simulators
      • Laparoscopic Surgical Simulators
      • Gynecology Surgical Simulators
      • Cardiac Surgical Simulators
      • Arthroscopic Surgical Simulators
      • Other Interventional/Surgical Simulators
    • Endovascular Simulators
    • Ultrasound Simulators
    • Dental Simulators
    • Eye Simulators
  • Web-Based Simulation
  • Medical Simulation Software
    • Performance Recording Software
    • Virtual Tutors
  • Simulation Training Services
    • Vendor-Based Training
    • Educational Societies
    • Custom Consulting Services & Training Services

Segmentation by End-Users:

  • Academic Institutes
  • Hospitals
  • Military Organizations
  • Other End Users

Segmentation by Region:

  • North America
    • United States of America
    • Canada
  • Asia Pacific
    • China
    • Japan
    • India
    • Rest of APAC
  • Europe
    • United Kingdom
    • Germany
    • France
    • Spain
    • Rest of Europe
  • RoW
    • Brazil
    • South Africa
    • Saudi Arabia
    • UAE
    • Rest of the world (remaining countries of the LAMEA region)

About GMI Research

GMI Research is a market research and consulting company that provides syndicated research reports, consulting services, and customized market research reports. Our reports are based on market intelligence studies to ensure relevant and fact-based research across numerous sectors, including healthcare, automotive, information technology & communication, FMCG, and other industries. GMI Research’s deep understanding related to the business environment helps us in generating objective strategic insights. Our research teams consisting of seasoned analysts and researchers have hands-on experience in various regions, including Asia-pacific, Europe, North America, and the Rest of the World. The market research report offers in-depth analysis, which contains refined forecasts, a bird’s eye view of the competitive landscape, factors impacting the market growth, and several other market insights to aid companies in making strategic decisions. Featured in the ‘Top 20 Most Promising Market Research Consultants’ list of Silicon India Magazine in 2018, we at GMI Research are always looking forward to help our clients to stay ahead of the curve.

Media ContactCompany Name: GMI RESEARCHContact Person: Sarah NashEmail: enquiry@gmiresearch.comPhone: Europe – +353 1 442 8820; US – +1 860 881 2270Address: Dublin, IrelandWebsite: www.gmiresearch.com

Mexican therapy increases survival of cervical cancer patients

Friday, June 19, 2009

A research team from the Institute of Biomedical Research of the National Autonomous University of Mexico has developed a therapy that extends survival for locally advanced cervical cancer patients. The study was started at the National Oncology Institute, before trials were conducted worldwide.

The new treatment, which serves as a guideline worldwide, involves using the drug gemcitabine as a radiosensibilizing agent to potentiate the effects of a regime of cisplatin chemotherapy and radiotherapy, explained Alfonso Dueñas González, who led the study. Despite the addition of another drug making the scheme slightly more toxic, the secondary effects are acute and are present only during the 70 to 80 days the treatment lasts, during which the patient can become weak, as with any chemotherapy.

Under this treatment, the survival of patients rises to 78 percent. This is 9 percent above conventional methods, as concluded the study in its phase III, which lasted four years and involved 515 patients from different countries.

Despite cervical cancer being preventable if detected early by the Pap test, it causes more than 250,000 deaths a year worldwide, becoming the second cause of death by carcinoma among women, and the second most diagnosed illness in this group.

One of the advantages of this therapy is that both gemcitabine and cisplatin are affordable drugs, which makes it available for the world population and may help reduce the death rate by this disease. According to Dueñas González, although cervical cancer should be fought by focusing on early detection rather than on treatment, the therapy is expected to start being used in short by health institutions throughout the world.

Retrieved from “https://en.wikinews.org/w/index.php?title=Mexican_therapy_increases_survival_of_cervical_cancer_patients&oldid=839769”

Study says dogs can smell lung and breast cancer

Monday, August 7, 2006

Dogs can be trained to detect early and late stages of lung and breast cancer accurately according to a study published by California scientists in the little-known scientific journal Integrative Cancer Therapies.

The study took place over the last five years at the Pine Street Foundation, a non-profit organization which conducts evidence-based research on integrative medicine (combining complementary and alternative medicine and mainstream medicine). Michael McCulloch and colleagues used three Labrador Retrievers and two Portuguese Water Dogs, both common pets, that received basic behavioral dog training. The researchers trained the dogs to lie down next to a sample from a cancer patient and to ignore other samples.

The samples used were breath samples from 55 patients with lung cancer and 31 with breast cancer — the two types of cancer with the highest mortality rates in the United States.

After the training phase, the dogs’ accuracy diagnosis was tested in a double-blind experiment. Among lung cancer patients, the sensitivity and specificity were 99% accurate and for breast cancer sensitivity was 88% and specificity 98%. Because these figures seem almost too good to be true, cancer experts are the same time baffled and skeptical. The authors of the study themselves also say replication of the study is needed.

Importantly, this was independent of the cancer stage, meaning the dogs were able to pick up the scent of cancer in its early stages. This is important because in many cases, the success of any treatment depends on early diagnosis. However, the researchers don’t believe this will lead to the use of dogs in the clinic soon, rather they want to find out which chemicals are actually sensed by the canines, because they could be used in laboratory assays. “It’s not like someone would start chemotherapy based on a dog test,” Dr. Gansler of the American Cancer Society said, “They’d still get a biopsy.”.

The researchers were inspired by anecdotal reports about dogs detecting cancer. In 1989, a British women consulted with her family physician because her Dalmatian kept licking a mole on her leg. At biopsy it showed to be malignant melanoma. When diagnosed too late this form of cancer has a poor survival rate, but in this case early surgery was made possible, and the women survived. Prior studies showed that breath samples from patients with lung cancer or breast cancer contain distinct biochemical markers. This provides a basis for the hypothesis that some cancer types produce volatile chemicals that dogs could smell. A study published in the British Medical Journal already proved that dogs could use their exquisite sense of smell to detect bladder cancer in urine samples, but they were only correct in 41% of cases, and another study provided preliminary evidence that dogs could detect melanomas.

This doesn’t mean you can show your breasts to your dog and it will tell you if you have cancer, other physicians caution, and scientists do not advise people to train their dogs to sniff for cancer. Unresolved issues from the study include the fact that subjects were required to breathe deeper than normal, so it’s not sure whether dogs can smell cancer in normal breath. Also, whether this is a permanent skill that would be retained by dogs was not tested.

Finally, there are concerns that could arise over liability issues: who would be responsible when the dog makes a mistake?

Current detection methods for both lung and breast cancer are not flawless. For lung cancer, chest X-ray and sputum cytology (detecting cancer cells in coughed up fluid) fail to detect many early cases, and CT scan produces many false-positive results unless combined with expensive PET scans. Although it might be comparing apples and oranges, a $2.5 million CT scanner has an accuracy of 85 to 90%. Mammography also produces false-positive results, and it may be difficult in women with dense breast tissue. As such, another type of “pet”-scan, using dogs as a biological assay, might prove feasible for screening if supported by further research. Current tests are also expensive so the use of dogs for preliminary cancer testing could prove to be an affordable alternative for countries in the developing world.

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The Amazing Appeal Of Outdoor Kitchens

byadmin

Homeowners sometimes find themselves with extra square footage. This is usually amidst a patio or backyard setting. The overall appeal of these locales is fascinating. You’re going to find that they can be retrofitted with a lot of different options. As you look at the different options that you have for outdoor space, don’t dismiss the notion of having a kitchen outside. Outdoor kitchens are interesting in that they provide the best of a lot of different elements outside. If you aren’t quite sure, consider some of the alluring aspects of this option that you’ll want to consider.

Entertaining With Culinary Elements

[youtube]http://www.youtube.com/watch?v=zvcHZp4Nkok[/youtube]

First and foremost, consider the culinary options that you will have in place. When you have a full outdoor kitchen, you could do a lot more than just grill some steaks. Imagine getting a lot more done. For instance, what if you wanted to do a mixed menu? Some things grilled, some things baked, and others boiled? You can do it all if you have the right equipment in place, and that’s where this comes shining through. This brings together entertaining options that you wouldn’t be able to do otherwise.

The Visual Design

There’s nothing quite as amazing as having a nice open concept kitchen. Now, multiply that by 10 and you will see that outdoor kitchens can absolutely give you a thrill. This concept goes beyond the ability to just cook and entertain. There’s a visual element to this that is absolutely stunning. You’re going to find that it will come into play when you want to sell your home. Selling your home with this in place will draw the eye, and give you a little more wiggle room in terms of asking price.

The Concepts

For those that aren’t sure what outdoor kitchens consist of, you’ll definitely want to look at the possibilities. If you have a lot of space, you could have a full scale culinary range. From installing ovens, burners, grills, and sinks to putting in islands, you have a lot of diverse opportunities to explore. This includes the additional elements of tile, stone, and more that can accent your existing patio or decking.

At the end of the day, kitchen renovations don’t have to be isolated to just the interior of your home. You could use existing, outdoor spaces to create outstanding concepts. Kitchens can bring about so much, especially if you want to entertain. If you want to have friends over, or just have a family get together, you can easily do so when you have outdoor area to cook, entertain and more. Installation is a matter of working with a good crew and contractor. Once all the pieces are put into place, you’ll wonder how you managed without it all.