KSU also holds classes at the Cobb Galleria Centre, Dalton State College, Appalachian Technical College and Dallas. Current enrollment is over 32,000 students.
KSU is part of the University System of Georgia. The university has academic programs in business, education, nursing, criminal justice and sports management. The campus is in a suburban area on 384 acres (155 ha) of land.
A South Korean research team has developed new technology to improve tabletop holographic displays
Princess Leia, your Star Wars hologram moment may be redeemed. In the original ‘Star Wars’ movie, the inviting but grainy special effects hologram might soon be a true full-color, full-size holographic image, due to advances by a South Korean research team refining 3-D holographic displays.
The team described a novel tabletop display system that allows multiple viewers to simultaneously view a hologram showing a full 3-D image as they walk around the tabletop, giving complete 360-degree access. The paper was published this week in the journal Optics Express, from The Optical Society (OSA).
To be commercially feasible in a range of applications — from medicine to gaming to media — the hologram challenge is daunting. It involves scaling an electronic device to a size small enough to fit on a table top, while making it robust enough to render immense amounts of data needed to create a full-surround 3-D viewing experience from every angle — without the need for special glasses or other viewing aids.
“In the past, researchers interested in holographic display systems proposed or focused on methods for overcoming limitations in the combined spatial resolution and speed of commercially available, spatial light modulators. Representative techniques included space-division multiplexing (SDM), time-division multiplexing (TDM) and combination of those two techniques,” explained Yongjun Lim, of the 5G Giga Communication Research Laboratory, Electronics and Telecommunications Research Institute, South Korea. Lim and his team took a different approach. They devised and added a novel viewing window design.
To implement such a viewing window design, close attention had to be paid to the optical image system. “With a tabletop display, a viewing window can be created by using a magnified virtual hologram, but the plane of the image is tilted with respect to the rotational axis and is projected using with two parabolic mirrors,” Lim explained. “But because the parabolic mirrors do not have an optically-flat surface, visual distortion can result. We needed to solve the visual distortion by designing an aspheric lens.”
Lim further noted, “As a result, multiple viewers are able to observe 3.2-inch size holograms from any position around the table without visual distortion.”
Building on these advances, Lim’s team hopes to implement a key design feature of strategically sizing the viewing window so it is closely related to the effective pixel size of the rotating image of the virtual hologram. Watching through this window, observers’ eyes are positioned to accept the holographic image light field because the system tilts the virtual hologram plane relative to the rotational axis. To enhance the viewing experience the team hopes to design a system in which observers can see 3.2-inch holographic 3-D images floating on the surface of the parabolic mirror system at a rate of 20 frames per second.
Test results of the system using a 3-D model and computer-generated holograms were promising — though right now still in a monochrome green color. Next, the team wants to produce a full-color experience and resolve issues related to undesirable aberration and brightness mismatch among the four digital micromirror devices used in the display.
“We are developing another version of our system to solve those issues and expect to have the next model in the near future, including enhancement of the color expression,” said Lim. “Many people expect that high quality holograms will entertain them in the near future because visualizations are increasingly sophisticated and highly imaginative due to the use of computer-aided graphics and recently-developed digital devices that provide augmented or virtual reality.”
And the Princess Leia hologram? That old miniature was a motivating experience of their work, Lim explained.
Researchers say that sharp-edged nanoparticles can block neurodegenerative proteins that impede cognitive function.
The next challenge is making nanoparticles in this shape out of nontoxic materials.
Nanoparticles have been investigated in recent years as tools for defending the brain against neurotoxic proteins that may contribute to the onset of several different neurodegenerative disorders including Alzheimer’s disease. Such proteins, in particular amyloid-beta peptides, are thought to play a role depositing fibrous plaques on the brain that damage synapses(the contact points between neurons) and lead to a decline in cognitive capabilities.
During the onset of Alzheimer’s, amyloid beta collects in the brain centers that form new memories. As the disease progresses, these toxic protein fragments block neurotransmitters from reaching receptors on neurons. The promise of nanoparticles is that their capacity to mimic some biological functions as well as penetrate the blood–brain barrier will enable them to stop the growth of neuron-blocking fibrils better than drug compounds that might contain some variation of short peptides, antibodies or proteins—such as human serum albumin (HSA) protein. (There currently are no anti-Alzheimer’s drugs on the market.) Whereas such compounds have been shown to interfere with fibril formation, researchers are hoping that inorganic nanoparticles can do so more effectively.
Although the nanotech approach has great potential, the challenges are many, including finding a nanoparticle material that is effective yet also biocompatible and nontoxic. Another source of controversy: some nanoparticles that have been studied, including quantum dots and carbon nanotubes, seem to actually promote or accelerate fibrillation rather than prevent it.
A multidisciplinary team of researchers from the University of Michigan at Ann Arbor(U.M.) and South Korea’s Kyungpook National University claim to have resolved at least some of nanotech’s shortcomings in tackling amyloid-beta peptides. In a study published online last month in Angewandte Chemie International Edition the researchers describe inhibiting amyloid-beta fibrillation using cadmium telluride (CdTe) nanoparticles with a tetrahedral shape and negative charge.
“We decided to look at how inorganic materials can affect fibrillation of amyloid peptides, which are small proteinlike structures that form extended assemblies that look like nanofibers,” says Nicholas Kotov, a U.M. chemical engineering professor who led the study.
Whereas as these CdTe nanoparticles are not biocompatible and would be toxic in the body, the researchers chose them because they resemble in size, charge and behavior some of the proteins that have proved effective in blocking fibrillation.