Samsung Electronics Co., Ltd.

Ls Cable Ltd.

Lg Cable Ltd.

Chul-Min Kim

Joon-Keun Lee

Sang-Joon Bae

Young-Il Kwon

Myung-Ho Jang

Hyun-seok Choi

Masamitsu Seki

Won-Sang Yoo

Young-geun Kim

A furnace for drawing an optical fiber includes a body having an upper and lower openings for supplying a preform and discharging a drawn optical fiber, a heating unit installed in the body for receiving and melting the preform, an atmosphere blocking tube installed to the lower opening for discharging the drawn optical fiber and blocking the optical fiber from the atmosphere, an upper introduction port formed at an upper portion of the body for introducing an inert gas toward the preform and partially discharged outside through a gap between the preform and the upper opening, a central and lower introduction ports formed at central and lower portions for introducing an inert gas into the body, a first flow guiding means for guiding the inert gas introduced through the central introduction port upward and then flowed down along a surface of the preform, and a second flow guiding means for guiding the inert gas introduced through the lower introduction port upward and then discharged outside through the atmosphere blocking tube along a surface of the drawn optical fiber.

Optical fiber drawing furnace with gas flow tubes

A method for monitoring a spin imparted on an optical fiber in order to reduce Polarization Mode Dispersion (PMD) includes the steps of imparting a spin on a high-temperature optical fiber which is drawn from a preform, photographing a dispersion pattern peculiar to the spun optical fiber with a camera from scattered light naturally generated by the spin imparted on the optical fiber, and displaying the photographed dispersion pattern. The method enables monitoring of rate and period of the spin imparted on the optical fiber on the basis of the displayed dispersion pattern.

Method for monitoring spin imparted on optical fiber and method for making optical fiber by using the same

A video signal processing apparatus and a design method therefor are provided, and more particularly, a design method for a video signal processing integrated circuit (IC), in which to solve the shortage of pin ports caused by designing a video signal processor in a single IC, a vertical synchronization signal is output and a quasi synchronization signal is input through a single pin port, and an IC and a video signal processing apparatus thereby are provided. According to the design method, by designing a vertical synchronization dividing circuit inside an IC without increasing the number of pins in a video signal processing IC, the present invention can reduce the number of components, material costs, and save the PCB space. In addition, by integrating the vertical synchronization dividing circuit inside an IC, the component difference of a discrete device can be reduced, which enhances IC performance.

Design method for a video signal processing integrated circuit and integrated circuit and video signal processing apparatus thereby

Outernet DNS searching units are included in a host, a DNS server, a router where a DNS server is registered, and a router where a DNS server is not registered, allowing Internet-enabled terminals to automatically search for a DNS server in an outernet. The host creates a DNS search message and transmits it to a subnet to which the host belongs so as to receive a response message. If no response message is received from the subnet (i.e., a DNS server is not connected to the subnet), the DNS search message is transmitted to an outernet to which the host does not belong, to which a DNS server is connected. Further, when a DNS server does not respond to a DNS search message from a host, a hop limit is increased to resend the DNS search message, thereby preventing waste of network bandwidth and easily detecting the closest DNS server.

Apparatus and method of searching for DNS server in outernet

A method for detecting a synchronous signal contained in an input image signal is provided. In the method, horizontal and vertical periods are established during which horizontal and vertical synchronous signal pulses contained in the input image signal are counted, respectively. Then, minimum and maximum horizontal values which correspond to the horizontal synchronous signal pulses contained in the horizontal period are established, and minimum and maximum vertical values which correspond the vertical synchronous signal pulses contained in the vertical period are established. Afterwards, the horizontal and vertical synchronous signal pulses are counted during the horizontal and vertical periods to respectively obtain first and second counted values. Then, the method determines if the first counted value is greater than or equal to the minimum horizontal value and less than or equal to the maximum horizontal value and determines if the second counted value is greater than or equal to the minimum vertical value and less than or equal to the maximum vertical value. Subsequently, the method determines than an actual synchronous signal is contained in the input image signal if the first counted value is greater than or equal to the minimum horizontal value and less than or equal to the maximum horizontal value and the second counted value is greater than or equal to the minimum vertical value and less than or equal to the maximum vertical value.

Method and apparatus for detecting a synchronous signal

A magnetic recording and reproduction apparatus corrects recording characteristics of a video signal. The apparatus comprises a luminance test signal generator for generating a frequency-modulated luminance test signal using a predetermined voltage, and a chroma test signal generator for generating a chroma test signal having a lower frequency. A recording level adjuster respectively adjusts levels of the frequency-modulated luminance test signal and the chroma test signal based on corresponding luminance and chroma recording levels. A recording unit mixes signals level-adjusted by the recording level adjuster to record a mixed test signal on a magnetic tape. A readout and preamplifying unit reads out the mixed test signal from the magnetic tape and preamplifies the read-out signal. A controller determines an optimal luminance recording level and an optimal chroma recording level to record a video signal on the magnetic tape based on the mixed test signal, and supplies the determined luminance recording level and chroma recording level to the recording level adjusting means. Accordingly, the apparatus sets optimal recording levels of the video signal capable of maximizing enhancement of the performance of the tape within a short period of time, and records the video signal, thereby improving a signal-to-noise ratio of the luminance signal and the color signal.

Growing community of inventors

Suwon-si, South Korea

Chul-Min Kim