Korea Institute of Science and Technology

Isd Inc.

Suk Won Chun

Seong M Jo

Wha Seop Lee

Hyung Sun Kim

Byung Won Cho

Kun You Park

Won Il Cho

Kyung Suk Yun

Duk Chan Yoon

Won Young Seo

Un Seok Kim

Seok Gu Go

Seok Ku Ko

Vasundhara Dehiya

Sung Won Choi

Provided are a business default prediction system and an operation method thereof. The method includes collecting a plurality of news articles on the Internet, selecting a business that is an analysis target, classifying news articles related to an analysis target business among the plurality of collected news articles into analysis target articles, calculating a risk level for each of the analysis target articles, generating feature vectors representing each group by performing grouping of the analysis target articles based on the calculated risk level, and calculating the default risk of the analysis target business based on the generated feature vectors.

Risk prediction system and operation method thereof

The present invention provides a lithium secondary battery and its fabrication method. More particularly, the present invention provides a lithium secondary battery comprising a super fine fibrous porous polymer separator film and its fabrication method, wherein the porous polymer separator film is fabricated by the following process: a) melting at least one polymer or dissolving at least one polymer with organic solvents to obtain at least one polymeric melt or at least one polymeric solution; b) adding the obtained polymeric melt or polymeric solution to barrels of an electrospinning machine; and c) discharging the polymeric melt or polymeric solution onto a substrate using a nozzle to form a porous separator film. The lithium secondary battery of the present invention has the advantages of better adhesion with electrodes, good mechanical strength, better performance at low and high temperatures, better compatibility with organic electrolyte solution of a lithium secondary battery.

Lithium secondary battery comprising a super fine fibrous polymer separator film and its fabrication method

The present invention relates to an apparatus of polymer web by electrospinning process and manufacturing method thereof, which can manufacture porous polymer web using an electrospinning method. The method for manufacturing porous polymer web by electrospinning process includes the steps of: forming, pressurizing and supplying at least one or more kinds of polymer materials in a liquid state; and discharging and piling the polymer materials to a collector through one or more charged nozzles, the collector being located under the nozzles and charged to have a polarity opposed to the polarity of the charged nozzles, the collector moving in a prescribed speed.

Apparatus of polymer web by electrospinning process

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Seoul, South Korea

Suk Won Chun