Get Inked at the Best Tattoo Shops in Memphis

The tattoo scene in Memphis has been a bit slow to find its footing, especially when compared to larger cities like LA or New York. However, that's all changing thanks to a few passionate individuals -- and shops -- who recognized the need to bring quality art into the birthplace of rock 'n' roll. As for the styles, there are many. Traditional art will always be popular because of the bikers, sailors, and rockabillies who built the subculture. Old-school artists were proficient in Japanese, so you see that living on in the work of their apprentices. There's also a lot of Egyptian and Masonic themes, harkening back to our city's namesake and foundations. Whatever it is you are looking for, you can find it in Memphis. And that's in large part thanks to the shops and individuals below who work their asses off to make sure they stay at the top of their game. Before you walk into any old shop, check this list out first. It might just save you from getting Eric Cartman tattooed on your forearm. 530 S Highland St (901) 327-0404 University District In the heart of the Highland strip one block from the U of M, Trilogy tattoos opened its doors in June of 1998. They have seven experienced artists and three seasoned piercers. One of their most well-known artists, Nathan Parten, got his start in 2001. A friend from MCA with was tattooing and suggested he try it a few times. When he got bored with his graphic design job, he finally went to watch. "I was immediately enthused," says Nathan. "I started my apprenticeship that week. Trilogy is a great shop that's full of fantastic artists who all encourage and challenge each other. They have a lot of return clientele and work on big session pieces. All appointments must be made in the shop and require a non-refundable $60 deposit. The hourly rate is $120/hr. 1557 Madison Ave (901) 425-3961 Midtown Inked is a state-of-the-art tattoo shop that opened inside Minglewood Hall five years ago. Their tattoo artists are hand-picked and represent some of the finest in town. The current manager, Brent Hale, got his first tattoo at age 14, and knew it was for him. At age 18, he got a job as a body piercer and started tattooing in his mid-20s after a good bit of traveling. He enjoys all styles of tattooing, Inked has a minimum charge of $75. And the hourly rate is $125-$150 depending on the artist. 2615 Broad Ave (901) 371-6923 Broad Avenue Arts District Babak Tabatabai got his start as a tattoo artist in 1999. "I had friends that tattooed and I started hanging out at their shop. I helped out with drawings if they were really busy, and eventually it evolved into an apprenticeship," says Babak. He opened Ronin Design & Manufacturing in the Broad Avenue Arts District after a bit of a struggle in December of 2013. Now he says it's basically a geek paradise. "I have a very eclectic background and it allows me to share a large part of my toy and art collection, and also my books. I have lots of books." He designed and built the interior of the shop himself and it truly reflects his personal aesthetic. Ronin is a one person shop at the moment, so Babak says he has to be comfortable with all styles. But if he had to choose, He does about 30-40 tattoos a month, and charges $100/hr. 9057 Millbranch Rd (662) 393-1155 Southaven, MS Illusion Ink's artists specialize in custom work, enhancements, fine line, new school, old school, free hand work, and portraits. It's just over the state line in Southaven, Mississippi and has been in operation for 22 years. There are five artists, including James Mays, who is in his second year as a licensed artist. He dropped out of college to do an apprenticeship with a friend in Memphis and says he could not be happier with where he is currently. "My bosses are fantastic and allow me the room to grow artistically as well as provide me with sound advice and reason," he says. "The guys I work with are all great in their own way -- it's a place where you can receive positive and constructive feedback which I thrive on." Image-wise the shop is gorgeous, and James notes that it has the nicest bathroom he's ever seen in a shop. His style is the new traditional or neo-traditional -- which combines the bold line work of American Traditional tattoos and nontraditional color theory or format/application. He also enjoys working on designs with faces, hands, Illusion Ink has a minimum between $40-$60 and a $125 hourly rate, but they are open to working with clients on pricing. TattooImprovement.com (to book an appointment) Cooper Young Jake became interested tattooing after getting a terrible tattoo from a 20 year veteran. "My arrogant teenage ego jumped in and thought, 'I can do better than that!' Little did I know that I was about to get a taste of humble pie," he says. He moved to a private studio last year after 14 years at Underground Art. It is an appointment based studio with no front desk or open door. He's surrounded by artists of all sorts -- a fashion designer, several photographers, bloggers, illustrators, etc. His focus over the last few years has been oil painting and he tries to bring painterly techniques into his tattooing, He only works on six to eight projects at a time. His rate is $150 per hour with a two hour minimum. Side note: Jake is also the founder of the Tattoo Improvement Network which focuses on encouraging tattooers to explore other mediums and hone their skills. They have a video podcast (Fireside Tats), a Technique series (Fireside Technique), as well as a blog (Fireside Weekly). They recently began a more focused version of online tattoo education called Inside Fireside where they take small groups of artists and work with them individually. Check it all out at tattooimprovement.com. 2287 Young Ave (901) 272-1864 Cooper-Young Underground Art, in Cooper-Young, has been voted Memphis' Best Tattoo and Piercing Shop by the Memphis Flyer for 17 years. They have been adorning the Mid-South and beyond since 1993. They specialize in custom tattoos, precision body piercing, needle play, wit, and wisdom. They are woman-owned and strive to be a positive part of the community. Vanessa Waites completed her apprenticeship at Underground Art and has been tattooing there for ten years now. She has a degree in fine arts from U of M. She was drawn to UA because it was one of the first custom tattoo studios in the Mid-South and the first in Memphis. She does a lot of everything, The rate is $125 per hour. 1648 Whitten Rd (901) 388-8343 Bartlett Artist owned and operated, Studio 42 specializes in many different styles of artwork, including graphic new school, black and grey, Japanese, and traditional. The shop currently boasts 5 tattooers and their aim is to provide the best artwork possible while maintaining a comfortable family like atmosphere for their clientele. Owner Dustin Schild says, "We take a ton of pride in our work. We do not do cheap bullshit ass tattoos." Dustin got his start in 2000. Over the years, he developed the skills to tattoo a multitude of styles, but he has become known for American traditional and Japanese tattooing. "I do not like putting up any walls or specific titles on my work as I do not want to limit myself to anything in particular. My goal is to give the client the tattoo of their dreams and make their day, month, and year, Rates are $150 per hour for larger work. Smaller, one session pieces generally are given a flat rate based on detail, placement, and time. 1928 Madison Ave (901) 272-6996 Midtown No Regrets Tattoo Emporium, outside of Overton Square, opened in 2007. They currently have nine artists to suit every style. Artist Anthony Max was a poor college student trying to make a living as a painter when he spotted an advertisement in the Memphis Flyer for a tattoo apprentice. "I responded and snagged the job, and it turned out to be the best decision I've ever made." he says. That was 18 years ago. "It's nice to see my art walking around the world instead hanging on a wall gathering dust," he says. Anthony specializes in painterly-style tattoos with vivid colors. He mostly does portraits, landscapes, flora, The rate is $125 per hour, with a discount for clients who want full sleeves or other full body pieces of art. Sign up here for our daily Memphis email and be the first to get all the food/drink/fun in the Blues City.

Get Inked at the Best Tattoo Shops in Memphis 1

1. If something is in an art gallery, is it art?

not necessarily. Photography falls into the same category: just because it might be in a gallery does not make it art. the hint is obtuse.

2. Is it hard to learn ballet as an adult?

The hardest thing for adults learning ballet is to come to terms with the complex traditions and discipline involved. Unlike other types of dancing, ballet dancing does not have the same moments of relaxation and release, even times when moves simulate relaxation they are carefully poised and controlled, and there are rules that must be meticulously obeyed. The movements are contrived for their beauty, they are not natural.With that said, you clearly do not have to learn ballet 'seriously', just be prepare to brush off and ignore the comments of who I call 'ballet-snobs', who will say that without proper discipline and technique "It's not ballet!". Do not worry though, what is important is that ballet is great fun, a fantastic way to keep toned and fit, and a way of creating art. Do not be intimidated by ballet and you will be fine. I suggest finding a friendly casual adult class with an experienced and successful dance teacher. Ballet is not as hard as you might think!

Get Inked at the Best Tattoo Shops in Memphis 2

3. Is the "Cowboy Economy" about to become a product of a bygone era?

The current state of art for industry is more like caveman than cowboy. The basic processes used by industry are as crude as anything the people of the stone age did. We still dump whatever we no longer want in landfill. We still have burning processes the are far more poluting than the caveman fire. And worst of all we are so superior as were the Romans a few centuries ago. What is being done in industry is just as stupid as anything done in the past-waste management is so poorly engineered a caveman could do it.

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Brand Selection Is an Important Play. Smart Home Should Pay Attention to the Transmission of Life Co
Brand Selection Is an Important Play. Smart Home Should Pay Attention to the Transmission of Life Co
In this environment, the smart home industry is even more popular. More and more large, medium and small players also begin to covet the trillion scale of the smart home market, and have entered the market across borders and joined in.For ordinary entrepreneurs, changing from their familiar traditional industry to a new and unfamiliar smart home field requires not only the courage to go out of the comfort zone, but also the wisdom and long-term vision of the first step. It is particularly important to accurately grasp the future development trend. However, entrepreneurs who want to change careers or have entered the smart home field at present, There will be some confusion.Recently, at the spring new product conference of livinglab life experiment smart home held in Zhengzhou, Henan Province, Du Xiaowen, Zhengzhou agent of livinglab smart home and general manager of Henan Lingying home Co., Ltd., shared with the guests his mental journey and experience from building materials and sanitary ware industry to smart home, Zhijia.com summarizes the valuable contents shared by President Du and hopes to help entrepreneurs with zero experience in smart home to avoid detours in their exploration.Du Xiaowen, Zhengzhou agent of livinglab life experimentPeople without foresight must have immediate worries. Switching to the smart home industry is a breakthrough in the new directionFrom the building materials and sanitary ware industry, which has been painstakingly operating for seven years, to the emerging smart home industry, Mr. Du Xiaowen said frankly that his friends in the building materials industry circle were unable to understand and did not understand why he suddenly switched to such a strange industry. In this regard, Du Xiaowen said that the traditional building materials and home industry has passed the peak of development and is now in the late stage of development, I have seen this familiar field very thoroughly. In the new era, as a person who dares to think and do, I also need more development space, and people without foresight must have immediate worries, so I need to choose a new direction to break through.Turning to the smart home field, in addition to the decline of the traditional building materials industry, Du Xiaowen said that the key factor is that the popularization of the smart home industry is the general trend of the whole social development, and emerging industries will be the pillar of national economic growth. Although when cooperating with livinglab smart home headquarters, At that time, I felt that the atmosphere of building a smart family in society was not so strong, but this was the future trend due to the development of technology, policy support, consumption upgrading demand and the important role of the industry itself in economic development. This was also the reason why I chose to enter the bathroom industry in 2010. At that time, the bathroom was an emerging industry in the process of urbanization, Sanitary ware will soon become a family standard and enter the consumer market.Brand selection is an important play. Smart home should pay attention to the transmission of life conceptFor entrepreneurs who want to enter the smart home industry, everyone must go through the stages of market investigation and brand selection. Mr. Du Xiaowen also came step by step. In the second half of 2017, he began to communicate with the relevant principals of livinglab life experiment smart home. After eight months of communication and investigation, Du Xiaowen finally reached a cooperation intention with livinglab life experiment.Recalling the process of his investigation at that time, Mr. Du Xiaowen said that he had a comprehensive understanding of policies, products, technology and ideas. As a high-tech industry, smart home must have high requirements for technology. This was his most basic understanding as a layman at that time, so it was important to go to the field to experience. In addition, from the landing of products, Smart home brands that choose to cooperate must be differentiated from other brands in the market. Du Xiaowen believes that a strong original brand is very important because it is supported by technical strength.Smart home products should fit perfectly with consumers and be divided into different consumption levels. They should not only meet the needs of high-end consumer groups, but also be "grounded" and popular, and the product price should be acceptable to ordinary consumers. Livinglab life experiment smart home uses different technologies to launch a variety of series of products for different consumer groups, The consumer market covers a wider range, and these advantages are deeply recognized by Du Xiaowen.In the era of rapid development of technology, the upgrading speed of household appliances and other products is very fast, especially intelligent products, so the capacity expansion of technology is very important. In addition, Mr. Du Xiaowen also mentioned the product concept. He believes that a good product should have a life concept. In the process of bringing the product to the market, it should enable consumers to feel that you are not only promoting the product to him, but also transmitting a life concept. Such a product is more persuasive, easier for consumers to understand, and more conducive to tapping consumer demand points, Mr. Du Xiaowen pointed out that in fact, many high-end designers have a strong interest in smart home, but they don't understand what smart home is. This involves the design concept of smart home products. For example, promoting smart home is not only selling products, but also delivering a more comfortable, convenient and safe lifestyle.The staff are explaining to the customerOpportunities and risks coexist. The key to making smart home is to be able to landSmart home has a strong development momentum, but the most important thing is to be able to land and not float in the sky. In view of the extremely hot investment attraction in the industry, Mr. Du Xiaowen said frankly that although smart home is an emerging industry with broad development prospects, it also has high risks. Some brands may not have mature technology or business models, Then you can't stick to it. You had this feeling when you were in the bathroom industry, so he also suggested that entrepreneurs should always be rational. In the smart home industry, technology breakthrough and business model are the key points to help the brand landing.Referring to his own experience, Mr. Du Xiaowen gave some examples in combination with the actual situation of Zhengzhou market. He said that in the view of laymen, Zhengzhou market may be better than some counties and cities, but this is not absolute. After all, Zhengzhou house prices are relatively high, and some people have invested a lot of money in buying and decorating villas, so the economy may be tense in the later stage, We will not consider installing the whole house smart home, but those young people who live in 80 or 90 square meters of small three houses in small counties and cities have a young mentality and pursue a quality life. On the contrary, they will want to have the whole house smart home. This phenomenon is just contrary to our thinking. Therefore, when entering the smart home industry, do not start from having money or not having money, The size of the house is easy to judge whether consumers will pay for the smart home. The key is that your products should be able to enter the mass consumer market. Only in this way can you do it for a long time.With regard to the expansion channels of the smart home market, Mr. Du Xiaowen believes that you can cooperate with designers or carry out different industry alliances. It will be better to inspire consumers through designers than tough sales. In addition, you can also participate in some group purchase meetings. Secondly, there must be a physical smart home exhibition hall. After all, what you sell is not products, but intelligent life scenes, In terms of the reception process of the exhibition hall, even if there is no fixed format, there are still some concepts such as customer reception and telemarketing. We must pay attention to details.The smart home industry releases the signal of landing popularity, and the marketing experience needs to be constantly explored and renovated5g concept is hot, gradually entering the pre commercial stage, and has been truly implemented in some regions this year. 5g network has become a social infrastructure, which will certainly drive the faster development of smart home and artificial intelligence industry. In addition to external factors, Mr. Du Xiaowen said that from the opening of smart home experience stores in high-end home stores such as Zhengzhou incredibly home and red star Macalline, Since 2018, the number has indeed gradually increased, which also releases a very obvious signal that smart home should be popularized, transition from listening to seeing in the stage of market education, and then really land.How to seize this opportunity and make smart home truly popular depends on how dealers understand smart home. In Mr. Du Xiaowen's opinion, engaging in the smart home industry at this stage is the same as at the early stage of reform and opening up. You don't have rich and ready-made experience to learn. In this process, everyone keeps exploring and renovating, We should think about how to package and promote smart home.His familiarity with the local market, analysis of consumption level and understanding of competitive brands are all conducive to helping us achieve precision marketing, which also has a lot to do with the marketing ideas before changing careers. Mr. Du Xiaowen said that only by doing smart home marketing can we really attack hard. In addition, Mr. Du Xiaowen also eagerly hopes that more like-minded partners will join the smart home industry, practice and know the truth. We can communicate together, summarize and share experience in practice, and the probability of success will be higher.
Which Connection Mode Should Be Selected for Smart Home Products?
Which Connection Mode Should Be Selected for Smart Home Products?
"Smart" says it every year, especially this year. Many manufacturers have started the "intelligent" road of their products. Therefore, there are smart TV, smart air conditioner, smart refrigerator, smart lighting... All kinds of intelligent household products.At present, the players of smart home products are mainly divided into three types. One is traditional manufacturers, who want to make their products more competitive through transformation; One is the Internet giant, who wants to grab the entrance to the Internet through these products; There is also a new generation of makers. They have no clear purpose. Some are purely hobbies, just playing, and some want to make a difference in the wave of "intelligence"These three players have their own characteristics. Traditional manufacturers have strong hardware, fast product iteration and can keep up with the pace of the market, but their software ability is their weakness; Internet giants have strong network software, have a large number of users and are familiar with user experience, but their hardware manufacturing ability is weak; The new generation of makers have strong innovation and many ideas, but their manufacturing capacity is zero.So what is the current situation of smart home products on the market? To be honest, it's really not good. First of all, the user experience is relatively poor, the installation and use are cumbersome, and the learning cost is high; Secondly, the product is seriously fragmented, the function is relatively single, and the gimmick is greater than the application; In addition, it relies too much on the network and is bound by the network, so it can not be used when the network is disconnected.At present, among the popular connection technologies, wireless connection methods mainly include WiFi, ZigBee, Bluetooth, etc., and wired connection methods include PLC.Wireless connection modeWiFi based smart products are the most common, which is inseparable from some of the advantages of WiFi in addition to the popularity of WiFi itself. Its biggest advantage is that the transmission rate is high, which can reach 54Mbps, its effective distance is also very long, it is convenient to integrate with the existing wired Ethernet, and the networking cost is relatively low.Its disadvantage is that the cost and power consumption are relatively high. At present, there are many companies providing WiFi connection solutions. The mainstream ones are Qualcomm's low-power single-chip platform qca401x, Broadcom's highly integrated low-power wiced platform, MediaTek's recently launched mt7687, Marvell's mw300 and ST's spwf series micro intelligent WiFi modules, etc.For the problem of high WiFi power consumption, chip manufacturers have been trying to improve. Recently, the domestic rockchip claimed to have developed a WiFi chip rki6000 with power consumption close to the Bluetooth 4.0 Le standard. According to the news released by their company, they mainly realize ultra-low power consumption through the following three aspects:1. Improvement of wireless communication and RF system architecture. This technology can greatly reduce the power consumption of IOT intelligent hardware equipment when continuously receiving and sending data, and enable intelligent hardware to achieve ultra-low power consumption during standby and use. At present, this technology has obtained dozens of international patents.2. Implementation of adaptive dynamic power control technology. This technology can improve the power efficiency in different working modes, greatly reduce the comprehensive energy consumption in different application scenarios, and adjust the chip power configuration according to the data transmission requirements and actual transmission quality to achieve the best energy efficiency ratio.3. WiFi online connection does not wake up the technical innovation of the master control. According to the long standby and online characteristics of IOT Internet of things applications, rki6000 can maintain WiFi online connection without waking up the main control processor, thus simplifying the design of system power consumption and prolonging battery life.ZigBee products are not very common. They are characterized by low power consumption, good confidentiality, strong scalability, large network capacity and low transmission rate.At present, the domestic ZigBee technology mainly adopts the 2.4G frequency in the ISM band, which has weak diffraction ability and wall penetration ability. In the home environment, even a door, a window and a non load-bearing wall will greatly reduce the signal. In addition, compared with WiFi and Bluetooth, there are not many chip manufacturers supported. At present, the latest include ti's cc2630, Marvell's MZ100 ZigBee microcontroller, Freescale's kinetis W series wireless modules, etc.Like WiFi, Bluetooth has a large number of terminal support. Although Bluetooth has the disadvantages of weak security, networking ability and anti-interference ability, with the launch of Bluetooth 4.0 and the support of mesh function, its application has become more extensive. Mesh Bluetooth technology can realize communication and linkage between devices, automatic progress of multipoint connection and remote control. The most common Bluetooth mesh solution is Broadcom's wiced mesh module product.Wiced mesh is characterized by simple configuration and easy deployment. The mesh device can be configured using a smartphone without special hardware devices. Point to point access, users can easily access any node from the mobile phone, update information and access safely. The network is easy to expand.Broadcom Bluetooth chip has good compatibility with Bluetooth in mobile phones, TVs and other products, and supports higher transmission power and lower sensitivity. The 20736 ble mesh SOC chip with low power consumption and low cost provided by the company has completed the process from concept to application.Figure 1: smart home product solution of Shenzhen Jianlian interworking Technology Co., Ltd.
Fetal Heartbeat Found on Doppler?
Fetal Heartbeat Found on Doppler?
Fetal Heartbeat found on Doppler?i am 13 weeks and that i rented a fetal doppler by using abdomen beats, and it worked out super. i replaced into able to %. up the toddler's heartbeat at 10 weeks. whether, bear in mind the thicker you are in the previous pregnancywill also have a potential on once you could %. up the pulse. in case you have been skinny in basic terms before the ppregnancy then you ought to be able to take heed to it with this doppler— — — — — —what does it mean when they order a doppler?Yep! The machine used to hear the baby's heart beat is called a Doppler! Have fun :) Congrats!— — — — — —How can a change in observer velocity theoretically be able to generate a relativistic doppler effect, as you can't move at different speed thanAs long as you are working in standard Einstein's relativity never think in respect of light. Such frames are not defined in it.Given that, relativistic Doppler effect was derived by directly comparing the perspective of the emitter and observer without regards to the perspective of the light— — — — — —The Doppler spectraUsually numerous targets are present in the sample volume of the radar. Each of the individual targets produces a frequency shift according to its radial velocity. Measuring the returned power in any interval of the frequency shift allows the detection of the Doppler spectrum. This is illustrated in the Figure on the right, where a sketch of the Doppler spectrum is shown. The frequency is already converted into velocity in the x axis. From the Doppler spectrum the reflectivity Z textstyle Z can be calculated using the expression: Z = ∫ v m i n v m a x S ( v d ) d v d displaystyle Z=int limits _v_min^v_maxS(v_d)dv_d (7) The integral of the spectral power S ( v d ) textstyle S(v_d) is called the 0-moment of the Doppler spectrum, which equals the reflectivity Z textstyle Z . Further, the first moment (8) and the second moment (9) of the Doppler spectrum can be calculated: V = 1 Z ∫ v m i n v m a x v d S ( v d ) d v d displaystyle V=frac 1Zint limits _v_min^v_maxv_dS(v_d)dv_d (8) W = 1 Z ∫ v m i n v m a x ( v d − V ) 2 S ( v d ) d v d displaystyle W=sqrt frac 1Zint limits _v_min^v_max(v_d-V)^2S(v_d)dv_d (9) The first moment of the Doppler spectrum is the mean Doppler velocity V textstyle V . It corresponds to the mean radial velocity in the sampled volume. The second moment is called the Doppler width W textstyle W . It corresponds to the variance of the Doppler spectrum. The Doppler width basically is a measure of the width of the spectrum of the detected velocities. It can also be a measure of the number of modes the targets size distribution has. A mono-modal distribution gives a small spectral width. A distribution that has several modes yields a lager spectral width, as illustrated in Figure 5. The spectral width is also influenced by turbulent motion of the targets in the sample volume: the spectral width increases with increasing turbulence. The expressions to calculate the Kurtosis and the Skewness are coming out of mathematical statistics several formulations are used. Some of them can be found in the quoted literature in Kurtosis section. Doppler velocityMean Doppler velocity can be seen as the mean frequency of a power spectrum (Doppler velocity) of the backscattered power. Given the mean Doppler velocity (mean frequency of the power spectrum) of the measured volume along the line of sight - the radial velocity. For vertical measurements, the Doppler velocities is the sum of terminal velocity of particles, caused by gravity force, and air motions within the measured volume. Terminal velocity contains the information about microphysical properties of cloud particles. In order to obtain the terminal velocity from the cloud-radar observations, the influence of air motions that shift the spectrum have to be removed from the Doppler spectra, improving in this way the microphysics representativity. An approach to correct this shift is given by Kollias et al., improving the accuracy of the relation between the corrected Doppler velocity and the particle fall velocities. Doppler widthThe Doppler width, or Doppler spectrum width, is the standard deviation of the spectrum. Accordingly, small values stand for narrow spectra, while higher spectrum width corresponds to a bigger spreading of the hydrometeors over the velocity domain (frequency domain). Reasons for a higher width could be bi- or multiple-modal spectra. This means that the measured volume contains more than one hydrometeor population, which leads to two or more modes in the Doppler spectrum because of the different terminal velocities. A rapid change in Doppler width in combination with the mean Doppler velocity can also be used to separate two hydrometeor population. Since the air motion in the atmosphere affects the Doppler width, this parameter provides information about turbulence within the measured volume. Up- and downdrafts slow down the terminal fall velocities and can decrease or increase the Doppler width. If the measurements are not done pointing to the zenith, the horizontal wind component influences the width as well. The knowledge of the actual wind components in the atmosphere can be used to correct the Doppler spectrum, so that the retrieved microphysical parameters can be improved and the uncertainties decreased. SkewnessThe skewness parameter of the Doppler spectrum describes the asymmetry of the spectrum with respect to a symmetric Gaussian distribution. S k = 1 Z ∫ v m i n v m a x ( v d − V ) 3 | S ( v d ) | 2 d v d W 3 displaystyle Sk=frac frac 1Zint _v_min^v_max(v_d-V)^3|S(v_d)|^2mathrm d v_dW^3 (10) This parameter relates the location of the spectrum peak in respect to the mean spectrum value. Therefore, a positive skewness value indicates that the peak is located to the left with respect to the mean. A negative skewed spectrum has its peak on the right side with respect to the spectrum mean. A value around zero indicates a symmetric spectrum. In this way, the shape of a Doppler gives information on changes of cloud microphysics or of dynamical changes within the measured volume. The higher the elevation of the radar is, the higher are the dynamical influences on this parameter. Because wind shears lead to a broadening of the Doppler spectrum width, they can lead to rapid changes in skewness as well. To be able to relate the change in skewness of the Doppler spectrum, the Doppler width should be cross-checked as well. If the radar measurements are done vertically, the skewness of the Doppler spectrum gives information about measured cloud microphysics. The horizontal wind within the measured volumes cause only a shift of the whole spectrum within the Doppler domain. This means that the spectrum is shifted along the Doppler velocity axis but it did not influence the broadening of the spectra. So the changes in skewness give information about: if the minority of the hydrometeors is falling faster or slower as the mean Doppler velocity if the Doppler spectrum is dominated by small hydrometeors (slower than the mean) or bigger particles (faster than the mean Doppler velocity) the shape of the size distribution of the measured hydrometeors changes over height or time can be related to a change in the cloud microphysicsKurtosisThe kurtosis of the Doppler spectrum also relates to its curve. It describes the tails of the spectrum curve relative to Gaussian. K = 1 Z ∫ v m i n v m a x ( v d − V ) 4 | S ( v d ) | 2 d v d W 4 displaystyle K=frac frac 1Zint _v_min^v_max(v_d-V)^4|S(v_d)|^2mathrm d v_dW^4 (11) Since the measure is dominated by the extremes, kurtosis can give information about the spectrum tail weight, helping to describe the spectrum better. If a Doppler spectrum is exactly normally distributed, then its kurtosis equals 3.0. If in general the kurtosis is >3, then the spectrum is called leptokurtic, or leptokurtotic. It can be assumed that the Doppler spectrum is dominated by one single particle population that leads to a strong and narrow peak, which in some (but not all) cases is indicated by high kurtosis. If the spectrum has kurtosis
Development History and Future Trend of Smart Home Wireless Protocol
Development History and Future Trend of Smart Home Wireless Protocol
According to a recent report by crimson hexagon, "from 2014 to 2017, smart home technology began to receive widespread attention, and more than 60% of consumers showed great interest in smart home technology." if you work in the Internet of things industry, you may be familiar with reports and data, Because this indicates the future market development opportunities of intelligent networked families.We all know that when consumers buy smart home products, they are often affected by many factors, such as entertainment, convenience, security, improving household energy efficiency and reducing energy expenditure. However, behind these, we all know that one of the biggest obstacles to the development of smart home is the interoperability of smart home devices and more and more wireless protocols.Wireless protocols such as Z-Wave and Wi Fi are important pillars of the Internet of things infrastructure; In some cases, these languages used between devices create fragmented or closed ecosystems, which often cause confusion and application obstacles to end users.With the increasing popularity of modern smart home, the number of corresponding protocols and functions is also increasing. Although engineers, developers and manufacturers all try to create products that they think have the best user experience and introduce new protocols and technologies, everyone wants to unify standards and connect and control all products. In order to better understand how we reach the current protocol state of smart home, let's look at a short history.Internet of things before Internet of thingsFirst, what is the function of wireless protocol in smart home?In short, a protocol is a language or function of how devices communicate and understand each other. Many people believe that the emergence of modern smart home protocol can be traced back to the creation of x10 (an international common smart home power carrier protocol) in the 1970s. It is the first general communication protocol for electronic devices. Soon after, various other protocols were developed, including Z-Wave, and UPB (universal power line bus), Wi Fi and insteon (a two-way hybrid communication technology with low complexity, low power consumption, low data transmission rate and low cost, with the characteristics of instant response, easy installation, easy use, economic reliability and compatibility with X10) to solve various problems in the consumer electronics and home control market.Released in 1999, UPB uses power line wiring for signal and control to provide a high level of reliability and transmission rate through existing wires in the home. This is a highly technical technology, which is difficult to adopt for DIY people who have little corresponding technical knowledge. In addition, Wi Fi was introduced in the early 1990s to transmit a large amount of data. Today, Wi Fi allows devices to connect in smart homes and allows users to enjoy remote control of home devices. However, Wi Fi does exist and faces challenges such as high interference and high power consumption, which is not ideal for battery powered products.Following Wi Fi, new generation protocols such as Z-Wave and insteon enhance network signals by providing efficient and low-power connections and using mesh networks, which are mainly designed for home control.Early technology of smart homeInsteon is designed by smartlabs Inc. to solve the connection between power line and wireless protocol. They were a unique solution at that time, but their closed ecosystem made it difficult for consumers to adopt.As an early mesh network technology, ZigBee was developed by HomeRF alliance. It is a wireless proprietary protocol with many different "profiles", which is mainly used in commercial, energy and remote control markets. Like ZigBee, Z-Wave is also a mesh network protocol, which was launched by the Danish company zensys in 2001 and is now owned by silicon labs.Z-Wave is specially built for smart home; Home control enthusiasts and developers know that in order to succeed, the standard must not only use low-power power power, but also not interfere with other home electronics, but also become stronger with the increase of equipment. As one of the original network technologies of home control, the tradition of Z-Wave continues today. Z-Wave is supported by the Z-Wave alliance, a member alliance of industry leaders committed to promoting standards. At the time of writing, Z-Wave has more than 2400 certified Z-Wave devices and more than 700 members.New member of smart home protocolIn the past few years, with the development of smart home technology, the demand for low-power mesh network as the technical pillar of smart home has prompted other standards organizations to constantly explore their own technology. We have seen that existing standards organizations such as thread (jointly launched by Samsung, nest, arm, big ass fans, Freescale and silicon labs, which is an IP based wireless network protocol used to connect smart products at home) and Bluetooth Technology Organization (SIG) and Wi Fi alliance have announced their own versions of Bluetooth mesh network and Wi Fi halow mesh network protocol.Thread was launched by Google and other large companies interested in smart home in 2014. Thread naturally supports IPv6 and aims to cooperate with Google and nest, but does not solve the problem of product level interoperability. Bluetooth grid was officially launched by sig in 2017. It has different functions compared with the known Bluetooth point-to-point communication. For the wi fihalow mesh network protocol, engineers from major chipset suppliers are worried about the power consumption of WiFi halow. They are worried that the protocol will consume too much energy for battery powered smart home devices.In addition, many newer protocols, such as Wi Fi halow, may take a long time to be adopted by manufacturers and create reasonable products for consumers, which is a major obstacle to their development.How will the smart home protocol develop in the future?The smart home market will continue to grow. So far, we have not seen enough signs that a certain standard or technology will dominate the world in the future. But we have a responsibility to help consumers understand the products they bring home and the role of each technology in practical application.For example, Wi Fi will become an integral part of the connection of all smart home products, especially if users want to be able to remotely access their devices outside the home. Bluetooth will play a key role in the smart lock market, so that consumers can easily open the door when they walk to the front door with a smart phone. Z-Wave is still a prominent technology in the security system. It connects lights, temperature controllers, door locks, sensors and other peripheral devices to make the family truly intelligent.At present, the commonly used network protocols include WiFi, Bluetooth, ZigBee and Z-Wave, but they all have shortcomings, such as:WiFi has high power consumption and is suitable for transmitting a large amount of data;Bluetooth power consumption is relatively low, but there is still a chaotic situation in which Bluetooth 2.0 and Bluetooth 4.0 coexist, and IPv6 is not supported;ZigBee technology is complex and the R & D cost is high;Z-Wave is led by zensys, a Danish company, and is not as strong as ZigBee Alliance for the time being.All wireless protocols have their advantages and disadvantages, but the most important selection factors are still interoperability and security, as well as more product choices. It depends on all of us, including everyone in the smart home ecosystem such as standards organizations, manufacturers, retailers and developers, to jointly promote and realize the interconnected smart home life.
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