1. Present to Kru John

2. Members 1. Virunyupa kittikasemsak ( Beam ) no.23 2.Napat Tanteerapat ( Jeen ) No.24 3. Kanokluck Thongkalya ( Book ) No. 25 4. Sukrittaya Chokchaipruk ( Proud ) no.26 3. What disruptive technology did you select? In disruptive technology , we selected Subtractive . Subtractive is the manufacturing of products by machine tools that reduce a solid block of metal or other material by any combination of drilling, turning on a lathe and grinding. Contrast with additive fabrication. See numerical control. 4. We are interested in Mobile Learning . The term m-learning ("mobile learning"), has different meanings for different communities, covering a range of use scenarios including e-learning, educational technology and distance education, that focuses on learning with mobile devices. Mobile learning is defined as "learning across multiple contexts, through social and content interactions, using personal electronic devices. WHAT SPECIFIC TECHNOLOGY ARE YOU INTERESTED IN? 5. subtractive is really CNC machininga process that removes material from a larger piece of material through standard machining processes such as milling, turning/lathing or drilling until the prototype part is created. Subtractive prototyping gives you the opportunity to design, prototype, and manufacture in end-use materials. It is an appropriate choice for parts used for small and large volume production runs, to obtain specific finishes, or to obtain 6. subtractive prototyping and manufacturing needs in-house, you can purchase desktop and larger sized machines from Roland DGA, an OEM of subtractive prototyping machines. Should you wish to use outside services for your subtractive needs, you can choose from a number of vendors, such as Proto Labs. These subtractive prototyping and manufacturing providers are skilled in CNC machining and can deliver prototypes and finished parts very quickly, often in a day or two. 7. Subtractive prototyping typically works with resins or metal materials, including ABS, Acetal Coplymer, acrylic, aluminum, brass, Delrin, HDPE, HMW, LDPE, Lexan, Lucite, Nylon, PEEK, PVC, Phenolic, plexiglass, polycarbonate, polypropylene, Rulon, Teflon, UHMW, Ultem, and wood. Depending on your application, you can match your design to a material for strength, flexibility, chemical resistance, 8. How was Subtractive invented? Subtractive process invented subtractive colour mixing . Subtractive color mixing is the kind of mixing you get if you illuminate colored filters with white light from behind, as illustrated at left. The commonly used subtractive primary colors are cyan, magenta and yellow, and if you overlap all three in effectively equal mixture, all the light is subtracted giving black. Subtractive color mixing is more complex than the additive color mixing you get with colored spotlights. 9. HOW IS SUBTRACTIVE BEING USED TO MAKE TOOLS? Subtractive used in printing processes to reproduce all colors. Magazines, photographs and any other object of nature creates color by subtracting or absorbing certain wavelengths of color while reflecting other wavelengths back to the viewer (RGB World). All color printing processes use the subtractive process to reproduce color (RGB World). In these cases, the reflective substrate is canvas or paper, which is usually white (RGB World). 10. Suppression subtractive hybridization Subtractive hybridization is a technology that allows for PCR-based amplification of only cDNA fragments that differ between a control (driver) and experimental transcriptome. cDNA is produced from mRNA. Differences in relative abundance of transcripts are highlighted, as are genetic differences between species. The technique relies on the removal of dsDNA formed by hybridization between a control and test sample, thus eliminating cDNAs or gDNAs of similar abundance, and retaining differentially expressed, or variable in sequence, transcripts or genomic sequences. Suppression subtractive hybridization has also been successfully used to identify strain- or species-specific DNA sequences in a variety of bacteria including Vibrio species. 11. *Combining Subtractive & Additive Systems for the Best of Both Worlds Mon, 03/17/2014 - 3:25pm Rachel Hammer, Product Manager, Roland DGA Corp. In the world of product design and development, few new technologies have generated headlines like todays 3-D printers. Popular among engineers and hobbyists alike, these devices are producing everything from prototypes and parts to fully functional products, jewelry and toys. While additive systems are well suited for a variety of applications, any seasoned engineer knows that when it comes to tools, the more you have the better. 12. Resources http://en.wikipedia.org/wiki/Suppressio n_subtractive_hybridization http://hyperphysics.phy- astr.gsu.edu/hbase/vision/subcol.html http://en.wikipedia.org/wiki/M-learning