Seoul National University

In Sun Cho

Kug Sun Hong

Dong Wook Kim

Sang Wook Lee

Hyun Joong Yu

Jun Hong Noh

Dong Wan Kim

Chin Moo Cho

Hee Bum Hong

Jeong Ryeol Kim

Duk Kyu Lee

Shin Tae Bae

Tae Hoon Noh

Chae Hyun Kwak

Disclosed herein is a light-responsive photocatalyst composition, which is a composite oxide semiconductor containing tungsten, and which can efficiently absorb visible light emitted from the sun and light emitted from interior lamps, such as fluorescent lamps, etc., and a method of preparing the light-responsive photocatalyst composition. The visible light-responsive photocatalyst composition can decompose volatile organic compounds or harmful organic matter causing sick house syndrome, even indoors, because it can be activated by visible light outdoors and can respond to light emitted from interior lamps, such as fluorescent lamps, etc.

Visible light-responsive photocatalyst composition containing tungsten-based oxides and method of producing the same

Disclosed herein is a phosphate-based dielectric ceramic composition which has a low dielectric constant and a low dielectric loss in the high-frequency bands such as microwave and millimeter wave. The composition is represented by the following formula: (1-x)(A'A&#x2033;)O-xPOwherein x and y are numbers satisfying the following conditions: 0 &#x3c;&#xd7;&#x3c;1 and 0&#x2266;y&#x2266;1, and A&#x2032; and A&#x2033; are each independently selected from the group consisting of Ca, Ba, Sr, Zn, Mb, Ni, Mn and Cu. The composition may further include a sintering assistant and an additive. Since the composition can be sintered at a temperature as low as 1,000&#xb0; C., it can be simultaneously calcined together with a metal electrode such as silver, copper or silver/palladium electrode.

Phosphate-based ceramic compositions with low dielectric constant and method for manufacturing dielectric substrate using the same

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Namyangju-si, South Korea

In Sun Cho