Abstract: Disclosed are an apparatus and a method for Internet of Things (IoT) device security. The method includes unifying a port in a first IoT device for communication, receiving, by the first IoT device, a packet from a second IoT device through the port, identifying whether the packet in the first IoT device is in a preset packet form, verifying content of the packet in the first IoT device when the packet is in the preset packet form, and opening the port for providing a service in the first IoT device when the verifying of the packet content is successful.

Abstract: A hologram diffuser for a liquid crystal display wherein a resin layer with a desired thickness is formed on an upper substrate. A hologram pattern is formed in the resin layer using a hologram plate. A smoothing film with a desired thickness is formed on the hologram layer provided with the hologram pattern. Accordingly, it is possible to assure a wide visual angle and realize a high picture quality.

Abstract: A hologram diffuser for a liquid crystal display wherein a resin layer with a desired thickness is formed on an upper substrate. A hologram pattern is formed in the resin layer using a hologram plate. A smoothing layer with a desired thickness is formed on the hologram layer provided with the hologram pattern. Accordingly, it is possible to assure a wide visual angle and realize a high picture quality.

Abstract: Device for reducing a jitter in an optical disc, is disclosed, including a DVD formatter for providing a DVD format signal according to a DVD source signal, a pulse width adjuster for separating the DVD format signal from the DVD formatter into signals of frequencies each being a certain times of a basic clock, comparing the signals to a reference voltage, and adjusting a pulse width of each of the signals according to results of the comparisons, a DVD signal extractor for adding the signals each having the pulse width adjusted in the pulse width adjuster in extracting a pulse width adjusted DVD signal, and amplifying the pulse width adjusted DVD signal, and a laser beam recorder for directing a laser beam onto a DVD according to the DVD signal extracted and amplified in the DVD signal extractor to form pits corresponding to the frequency of the certain times in the DVD, and a method for reducing a jitter in an optical disc, whereby facilitating individual adjustments of pulse widths of DVD format signals fro

Abstract: A method for printing a label on an optical disc using a rainbow graphic cutting system includes storing in a memory a location signal and color information data of the label to be printed on the surface of the optical disc. Corresponding location and data signals from among the location signals and the color information data are selectively output to a laser beam recorder LBR. A label corresponding to the signals output to the LBR is then printed on a surface of the optical disc.