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Messages - Md. Abrar Amin

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EEE / 5 ways to Celebrate Earth Day-3
« on: April 22, 2017, 03:58:22 PM »
Join an environmental group. Think about the issues that concern you the most and if you haven't done so already, join a local group that undertakes activities to help protect the environment in your area. Earth Day is a great day to start getting involved. In almost any community, you'll find local groups that do the following:[6]
Host clean-ups of local bodies of water and their shores
Fight air and water pollution
Plant trees and install community gardens
Protect habitats under threat of getting developed
Can't find a group? Consider starting your own.

EEE / 5 ways to Celebrate Earth Day-2
« on: April 22, 2017, 03:57:58 PM »
Learn more about the environment. Earth Day is a good time to make a commitment to learning more about the environment and how you can help to protect it. Read articles to get up to date on the current issues affecting the environment, like pollution, water shortages, and climate change. Or, learn about a region you've never considered before, like the Arctic, the deserts, or the rain forests. Not sure where to start? Check out your local news sources for information about environmental issues in your own backyard.
Understand how climate change works, and what you can do about it.[1]
If you live in a city, look into urban environmental issues like contaminated drinking water and energy conservation.[2]
If you live near a body of water, do research to find out whether it's healthy or in need of help.[3]
Learn more about fracking, which is affecting many communities in the United States.[4]
Find out which species native to your area are under threat of extinction.

EEE / 5 ways to Celebrate Earth Day-1
« on: April 22, 2017, 03:56:35 PM »
The celebration of Earth Day is on April 22nd and it began 1970. It has grown into a global event recognized by over 192 countries. Devoting special a day to helping for the earth is a way to demonstrate how much we care about the future of our planet. No matter what you like to do best, there's a way to get involved in Earth Day. You could plant a tree, make a meal with locally-grown vegetables, educate a family member, clean up trash in your neighborhood, set up a bird feeder or save power — the possibilities are endless. Remember, you don't have to wait for Earth Day to show your love for the planet we call home.

Latest Technology / LittleDog - The Legged Locomotion Learning Robot
« on: April 22, 2017, 03:53:52 PM »
LittleDog is a quadruped robot designed for research on learning locomotion. Scientists at leading institutions use LittleDog to probe the fundamental relationships among motor learning, dynamic control, perception of the environment, and rough-terrain locomotion. LittleDog is used at MIT, Stanford, Carnegie Mellon, USC, Univ. Pennsylvania and IHMC as part of a DARPA-funded program on advanced robotics.
LittleDog has four legs, each powered by three electric motors. The legs have a large range of motion. The robot is strong enough for climbing and dynamic locomotion gaits. The onboard PC-level computer does sensing, actuator control and communications. LittleDog's sensors measure joint angles, motor currents, body orientation and foot/ground contact. Control programs access the robot through the Boston Dynamics Robot API. Onboard lithium polymer batteries allow for 30 minutes of continuous operation without recharging. Wireless communications and data logging support remote operation and data analysis. LittleDog development is funded by the DARPA Information Processing Technology Office.

Latest Technology / RiSE: The Amazing Climbing Robot
« on: April 22, 2017, 03:53:16 PM »
RiSE is a robot that climbs vertical terrain such as walls, trees and fences. RiSE uses feet with micro-claws to climb on textured surfaces. RiSE changes posture to conform to the curvature of the climbing surface and its tail helps RiSE balance on steep ascents. RiSE is 0.25 m long, weighs 2 kg, and travels 0.3 m/s.
Each of RiSE's six legs is powered by a pair of electric motors. An onboard computer controls leg motion, manages communications, and services a variety of sensors, including joint position sensors, leg strain sensors and foot contact sensors.
Boston Dynamics developed RiSE in conjunction with researchers at University of Pennsylvania, Carnegie Mellon, UC Berkeley, Stanford, and Lewis and Clark University. RiSE was funded by DARPA.

Latest Technology / RHex - Devours Rough Terrain
« on: April 22, 2017, 03:52:16 PM »
RHex is a six-legged robot with inherently high mobility. Powerful, independently controlled legs produce specialized gaits that devour rough terrain with minimal operator input. RHex climbs in rock fields, mud, sand, vegetation, railroad tracks, telephone poles and up slopes and stairways.
RHex has a sealed body, making it fully operational in wet weather, muddy and swampy conditions. RHex's remarkable terrain capabilities have been validated in government-run independent testing. RHex is controlled remotely from an operator control unit at distances up to 700 meters. Visible/IR cameras and illuminators provide front and rear views from the robot.

EEE / SandFlea - Leaps Small Buildings in a Single Bound
« on: April 22, 2017, 03:50:48 PM »
Sand Flea is an 11 pound robot that drives like an RC car on flat terrain, but can jump 30 ft into the air to overcome obstacles. That is high enough to jump over a compound wall, onto the roof of a house, up a set of stairs or into a second story window.
The robot uses gyro stabilization to stay level during flight, to provide a clear view from the onboard camera, and to ensure a smooth landing. Sand Flea can jump about 25 times on one charge. Boston Dynamics is developing Sand Flea with funding from the US Army’s Rapid Equipping Force (REF).
Earlier versions of Sand Flea were developed by Sandia National Laboratory with funding from DARPA and JIEDDO.

EEE / BigDog - The Most Advanced Rough-Terrain Robot on Earth
« on: April 22, 2017, 03:50:19 PM »
BigDog is a rough-terrain robot that walks, runs, climbs and carries heavy loads. BigDog is powered by an engine that drives a hydraulic actuation system. BigDog has four legs that are articulated like an animal’s, with compliant elements to absorb shock and recycle energy from one step to the next. BigDog is the size of a large dog or small mule; about 3 feet long, 2.5 feet tall and weighs 240 lbs.
BigDog's on-board computer controls locomotion, processes sensors and handles communications with the user. BigDog’s control system keeps it balanced, manages locomotion on a wide variety of terrains and does navigation. Sensors for locomotion include joint position, joint force, ground contact, ground load, a gyroscope, LIDAR and a stereo vision system. Other sensors focus on the internal state of BigDog, monitoring the hydraulic pressure, oil temperature, engine functions, battery charge and others.
BigDog runs at 4 mph, climbs slopes up to 35 degrees, walks across rubble, climbs muddy hiking trails, walks in snow and water, and carries 340 lb load.
Development of the original BigDog robot was funded by DARPA. Work to add a manipulator and do dynamic manipulation was funded by the Army Research Laboratory's RCTA program.

EEE / CHEETAH - Fastest Legged Robot
« on: April 22, 2017, 03:49:47 PM »
The Cheetah robot is the fastest legged robot in the World, surpassing 29 mph, a new land speed record for legged robots. The previous record was 13.1 mph, set in 1989 at MIT.
The Cheetah robot has an articulated back that flexes back and forth on each step, increasing its stride and running speed, much like the animal does. The current version of the Cheetah robot runs on a high-speed treadmill in the laboratory where it is powered by an off-board hydraulic pump and uses a boom-like device to keep it running in the center of the treadmill. The next generation Cheetah robot, WildCat, is designed to operate untethered. WildCat recently entered initial testing and is scheduled for outdoor field testing later in 2013.
Cheetah robot development is funded by DARPA's Maximum Mobility and Manipulation program.

« on: April 22, 2017, 03:49:16 PM »
PETMAN is an anthropomorphic robot designed for testing chemical protection clothing. Natural agile movement is essential for PETMAN to simulate how a soldier stresses protective clothing under realistic conditions.
Unlike previous suit testers that had a limited repertoire of motion and had to be supported mechanically, PETMAN balances itself and moves freely; walking, bending and doing a variety of suit-stressing calisthenics during exposure to chemical warfare agents. PETMAN also simulates human physiology within the protective suit by controlling temperature, humidity and sweating, all to provide realistic test conditions.
The PETMAN system was delivered to the user’s test facility where it is going through validation experiments. Boston Dynamics' partners for the program are MRIGlobal, Measurement Technologies Northwest, Smith Carter CUH2A (SCC), SRD, and HHI Corporation.
©2016 Boston Dynamics.

EEE / Atlas - The Agile Anthropomorphic Robot
« on: April 22, 2017, 03:48:46 PM »
Atlas is a high mobility, humanoid robot designed to negotiate outdoor, rough terrain. Atlas can walk bipedally leaving the upper limbs free to lift, carry, and manipulate the environment. In extremely challenging terrain, Atlas is strong and coordinated enough to climb using hands and feet, to pick its way through congested spaces.
Articulated, sensate hands will enable Atlas to use tools designed for human use. Atlas includes 28 hydraulically-actuated degrees of freedom, two hands, arms, legs, feet and a torso.
An articulated sensor head includes stereo cameras and a laser range finder. Atlas is powered from an off-board, electric power supply via a flexible tether.
Several copies of the Atlas robot are being provided as Government Furnished Equipment for the DARPA Robotics Challenge program with delivery scheduled in the summer of 2013.
©2016 Boston Dynamics.

EEE / LS3 - Legged Squad Support Systems
« on: April 22, 2017, 03:48:15 PM »
LS3 is a rough-terrain robot designed to go anywhere Marines and Soldiers go on foot, helping carry their load. Each LS3 carries up to 400 lbs of gear and enough fuel for a 20-mile mission lasting 24 hours. LS3 automatically follows its leader using computer vision, so it does not need a dedicated driver. It also travels to designated locations using terrain sensing and GPS. LS3 began a 2-year field testing phase in 2012. LS3 isfunded by DARPA and the US Marine Corps.
Boston Dynamics has assembled an extraordinary team to develop the LS3, including engineers and scientists from Boston Dynamics, Carnegie Mellon, the Jet Propulsion Laboratory, Bell Helicopter, AAI Corporation and Woodward HRT.

A new method developed by Disney Research for wirelessly transmitting power throughout a room enables users to charge electronic devices as seamlessly as they now connect to WiFi hotspots, eliminating the need for electrical cords or charging cradles.
The researchers demonstrated their method, called quasistatic cavity resonance (QSCR), inside a specially built 16-by-16-foot room at their lab. They safely generated near-field standing magnetic waves that filled the interior of the room, making it possible to power several cellphones, fans and lights simultaneously.
"This new innovative method will make it possible for electrical power to become as ubiquitous as WiFi," said Alanson Sample, associate lab director & principal research scientist at Disney Research. "This in turn could enable new applications for robots and other small mobile devices by eliminating the need to replace batteries and wires for charging."
A research report on QSCR by the Disney Research team of Matthew J. Chabalko, Mohsen Shahmohammadi and Alanson P. Sample was published on Feb. 15, 2017 in the online journal PLOS ONE.
"In this work, we've demonstrated room-scale wireless power, but there's no reason we couldn't scale this down to the size of a toy chest or up to the size of a warehouse," said Sample, who leads the lab's Wireless Systems Group.
According to Sample, wireless power transmission is a long-standing technological dream. Celebrated inventor Nikola Tesla famously demonstrated a wireless lighting system in the 1890s and proposed a system for transmitting power long distances to homes and factories, though it never came to fruition. Today, most wireless power transmission occurs over very short distances, typically involving charging stands or pads.
The QSCR method involves inducing electrical currents in the metalized walls, floor and ceiling of a room, which in turn generate uniform magnetic fields that permeate the room's interior. This enables power to be transmitted efficiently to receiving coils that operate at the same resonant frequency as the magnetic fields. The induced currents in the structure are channeled through discrete capacitors, which isolate potentially harmful electrical fields.
"Our simulations show we can transmit 1.9 kilowatts of power while meeting federal safety guidelines," Chabalko said. "This is equivalent to simultaneously charging 320 smart phones."
In the demonstration, the researchers constructed a 16-by-16-foot room with aluminum walls, ceiling and floor bolted to an aluminum frame. A copper pole was placed in the center of the room; a small gap was created in the pole, into which discrete capacitors were inserted.
"It is those capacitors that set the electromagnetic frequency of the structure and confine the electric fields," Chabalko explained. Devices operating at that low megahertz frequency can receive power almost anywhere in the room. At the same time, the magnetic waves at that frequency don't interact with everyday materials, so other objects in the room are unaffected.
Though the demonstration room was specially constructed, Sample said it likely will be possible to reduce the need for metalized walls, ceilings and floors in the future. It may be possible to retrofit existing structures, for instance, with modular panels or conductive paint. Larger spaces might be accommodated by using multiple copper poles.
Combining creativity and innovation, this research continues Disney's rich legacy of innovation and leveraging technology to enhance the tools and systems of tomorrow.

Read more at:

EEE / Wireless electricity
« on: April 22, 2017, 03:46:05 PM »

ম্যালওয়্যারের মাধ্যমে প্রায় ১২০০ ফ্র্যাঞ্চাইজি’র লেনদেন কার্ডের তথ্য আক্রান্ত হয়েছে বলে জানিয়েছে ক্রাউন প্লাজা ও হলিডে ইন হোটেল ব্র্যান্ডের মালিক প্রতিষ্ঠান যুক্তরাজ্যভিত্তিক ইন্টারকন্টিনেন্টাল হোটেলস গ্রুপ (আইএইচজি)।

যুক্তরাষ্ট্র আর পুয়ের্তো রিকো-তে এই ঘটনা ঘটেছে বলে জানিয়েছে প্রতিষ্ঠানটি। এর ফলে অতিথিদের অর্থ চুরি যেতে পারে বলে তাদের সতর্ক করা করা হয়েছে। এর আগে চলতি বছর ফেব্রুয়ারিতে আইএইচজি তাদের পরিচালনাধীন যুক্তরাষ্ট্রের এক ডজন হোটেল একই ধরনের আক্রমণে আক্রান্ত হওয়ার খবর জানিয়েছিল।

সর্বশেষ খবরের প্রেক্ষিতে প্রতিষ্ঠানটি এক মুখপাত্র বিবিসি’কে বলেন, “প্রত্যেককে তাদের লেনদেন কার্ডের হিসাবের বিবৃতিতে ভালোভাবে নজর রাখা উচিত।”

“যদি সেখানে অননুমোদিত কোনো লেনদেন দেখা যায়, তবে তাদের সঙ্গে সঙ্গে তাদের ব্যাংক-কে জানানো উচিত।”

“সাধারণত লেনদেন কার্ডের নীতিমালা অনুযায়ী কার্ডধারী এই ধরনের কোনো লেনদেনের জন্য দায়ী নয়।” ক্রাউন প্লাজা ও হলিডে ইন ছাড়াও প্রতিষ্ঠানটির মালিকানাধীন অন্যান্য হোটেল ব্র্যান্ডগুলোর মধ্যে হোটেল ইন্ডিগো আর ক্যান্ডলউড স্যুটস রয়েছে।

আইএইচজি জানিয়েছে, তাদের তদন্তে ২০১৬ সালের ২৯ সেপ্টেম্বর থেকে ২৯ ডিসেম্বর সময়ের মধ্যে হোটেলগুলোর সামনের ডেস্কে লেনদের জায়গায় এই ম্যালওয়ার চালু করার চিহ্ন পাওয়া গেছে। তবে, মার্চে এই ঝুঁকি নির্মূল করা হয়েছে বলে নিশ্চিত করেছে প্রতিষ্ঠানটি।

হোটেল গ্রুপটির পক্ষ থেকে জানানো হয়, হোটেলগুলোর কম্পিউটার সার্ভারগুলোতে ব্যবহারের সময় লেনদেন কার্ডগুলোর ম্যাগনেটিক স্ট্রিপগুলো থেকে এই আক্রমণের মাধ্যমে তথ্য হাতিয়ে নেওয়া হয়। এই তথ্যের মধ্যে কার্ড নাম্বার, মেয়াদোত্তীর্ণের তারিখ ও ভেরিফিকেশন কোড রয়েছে। 

অতিথিদের অন্যান্য তথ্য হাতিয়ে নেওয়া হয়নি বলেই বিশ্বাস আইএইচজি-এর।

সাম্প্রতিক বছরগুলোতে হায়াত, ম্যান্ডারিন ওরিয়েন্টাল আর ট্রাম্প হোটেলসসহ বিভিন্ন হোটেল চেইনের লেনদেন ব্যবস্থা হ্যাকিংয়ের শিকার হয়েছে।

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