Pusan National University

Hyundai Motor Company

Myung Yung Jeong

Tae Ho Lee

Sang Uk Cho

Jin Hwa Ryu

Chang Seok Kim

Seung Hun Oh

In Woong Lyo

Woong Pyo Hong

Bo Kyung Kim

Kwang Hoon Choi

Jung Yeon Park

Ji Youn Seo

Doo In Kim

Sung Mo Park

Hwi Don Lee

A method of measuring a friction coefficient of a surface of a specimen includes: obtaining surface information of the specimen by using an atomic force microscope (AFM); calculating data of a friction coefficient of the surface of the specimen by using the surface information of the specimen; and mapping the data of the friction coefficient of the specimen to an image. The method of measuring a friction coefficient of a surface of a specimen may prevent a probe part of an atomic force microscope from being worn out and secure high reliability of the friction coefficient value by correcting the atomic force microscope using a specimen to be actually measured and measuring a fiction coefficient at the same time.

Friction coefficient measuring method of surface of specimen

The present invention relates to a method for manufacturing a two-dimensional polymer optical waveguide, which is used for manufacturing a two-dimensional optical waveguide through simplified processes using a single imprint original master. The method includes: replicating a pattern through a first hot-embossing process on a thermoplastic polymer sheet using a single original master; forming a buffer layer on the surface of the replicated pattern; manufacturing a polymer mold having a cladding pattern on the other side without a buffer layer through a second hot-embossing process using the original master; replicating a pattern by molding the polymer mold out of an elastic material and forming an upper elastic mold and a lower elastic mold by vertically separating the elastic material; and forming middle cladding using the upper and lower elastic molds, filling regions on and below the middle cladding with core resin patterns, and performing a curing process after stacking upper and lower cladding to form a two-dimensional optical waveguide.

Method for manufacturing a two-dimensional polymer optical waveguide

The disclosure relates to a method for manufacturing a photoaligning integrated large area metallic stamp, which includes the following steps: making a unit device PLC mold pattern, and molding a unit PLC device pattern through a multistep imprinting method using the PLC mold pattern; heat treating the unit PLC device pattern to minimize scattering loss due to surface roughness; making a groove pattern for supporting an optical fiber; making an integrated PDMS mold for a unit device by aligning the unit PLC device pattern and the groove pattern; and repeatedly replicating the integrated PDMS mold for a unit device to make a large area PDMS pattern, and making a large area stamp through electroforming using the large area PDMS pattern.

Method for manufacturing photoaligning integrated large area metallic stamp, and method for manufacturing polymer optical device using same

Discloses is an optical coherence tomography (OCT) which uses an active mode-locking fiber laser in order to obtain image information of a sample. An imaging device in accordance with an embodiment comprises: a light source unit; a light separation unit; a reference unit; a diagnostic unit; a light coupling unit; and a signal processing unit. The imaging device removes a high-priced variable filter which has mechanical restrictions by directly delivering a modulation signal to a light source unit, so it can overcome mechanical restrictions and reduce costs.

Optical coherence tomography using active mode-locking fiber laser

Growing community of inventors

Busan, South Korea

Myung Yung Jeong