Chonbuk National University is a national research university founded in 1947, located in Jeonju, South Korea. As the flagship national university for the Jeollabuk-do province , Chonbuk National University has been ranked 501–550th in the world by QS Top Universities Ranking in 2010. Wikipedia.
Chonbuk National University | Date: 2016-08-26
A method for manufacturing metal oxide-grown carbon fibers including immersing carbon fibers in a solution for forming a metal oxide seed layer and electrodepositing a metal oxide seed on the surfaces of carbon fibers, or irradiating microwave thereto to form a metal oxide seed layer, and irradiating microwave to the metal oxide seed layer-formed carbon fibers to grow metal oxide. The method for manufacturing metal oxide-grown carbon fibers can reduce process time, and improve process energy efficiency and production efficiency. The method for manufacturing metal oxide-grown carbon fibers can offer metal oxide-grown carbon fibers with improved interfacial shear stress.
Chonbuk National University | Date: 2017-03-22
The present invention relates to a composition and health functional food for preventing and treating male infertility using a mixed herbal mixture. Through an in vitro sperm mobility promotion effect evaluation method experiment for investigating effects of an herbal extract of Morinda officinalis, cuscuta seed, and/or Allium cepa of the present invention on changes in sperm count and mobility in human semen, it was verified that the samples of the present invention increased sperm mobility. In addition, through an in vivo varicocele animal model evaluation method for investigating effects of the herbal extract on changes in sperm count and mobility in an in vino varicocele animal model, it was verified that the samples of the present invention increased the sperm count in the semen obtained from spermiducts of a sample-administered group among varicocele-induced groups. Therefore, the herbal extract of the present invention can be usefully used in a pharmaceutical composition, health functional food, and health supplement food for preventing and treating male infertility.
Samsung and Chonbuk National University | Date: 2015-03-18
A liquid crystal device that includes two substrates that face each other, a liquid crystal cell interposed between the two substrates, and a liquid crystal alignment layer interposed between the liquid crystal cell and at least one of the two substrates, the liquid crystal alignment layer includes a plurality of spherical or spherical-like core particles having a diameter of 10 nm to 1 m.
Anygen Inc., Samsung, Snu R&D Foundation and Chonbuk National University | Date: 2016-01-13
The present invention relates to a pharmaceutical composition for treating or preventing erectile dysfunction, containing LDD175 as an active ingredient. Furthermore, the present invention relates to a co-administration preparation for treating or preventing erectile dysfunction, containing LDD175 and a PDE5 inhibitor as active ingredients. The LDD175 of the present invention has an excellent corporal smooth muscle relaxation effect, and thus significantly improved erectile function. Since the LDD175 of the present invention acts on BK_(Ca )channels, and thus is expected to have little adverse cardiovascular effects. The LDD175 of the present invention exhibits an erectile dysfunction therapeutic ability equivalent to that of udenafil, which is a PDE5 inhibitor, and showed a synergistic corporal smooth muscle relaxation effect when being co-administered with udenafil.
Samsung and Chonbuk National University | Date: 2015-06-19
An LCD panel, comprises substrates facing each other, a liquid crystal layer disposed between the substrates and liquid crystal alignment layers, each sandwiched between the liquid crystal layer and a respective one of the substrates, wherein the liquid crystal alignment layers comprises hydrocarbon derivative having perfluorocarbon group.
Woori nano co. and Chonbuk National University | Date: 2015-03-04
Disclosed is a nano-fiber spinning apparatus using centrifugal force which includes: (i) a top plate 6c which has nano-fiber spinning holes h, and is slantly formed at an inclination angle with a virtual horizontal line connecting top of a side wall 6b in a disk shape; (ii) a bottom plate 6a having a curved surface which is concaved and inclined upwardly in a dish shape; and (iii) the cylindrical side wall 6b connecting the top plate 6c and the bottom plate 6a, so as to be wholly formed in a spin-top shape. Also, disclosed is a method of manufacturing nano-fibers which includes, after supplying a spinning dope to the above nano-fiber spinning apparatus 6, spinning nano-fibers with centrifugal force toward a collector 7 provided above the apparatus while generating an air flow toward the collector by an air generator provided below the nano-fiber spinning apparatus 6.
Choi W.-Y.,Chonbuk National University
IEEE Transactions on Power Electronics | Year: 2013
This paper proposes a high-efficiency dc-dc converter with fast dynamic response for low-voltage photovoltaic (PV) sources. The voltage stress of power switches is reduced at low-voltage side. Zero-current turn-off of output diodes is achieved at high-voltage side. Power efficiency is improved by reducing switching power losses. A modified proportional and integral controller is also suggested to achieve fast output voltage control. The dynamic response of the proposed converter is improved. The performance of the proposed converter is verified based on an experimental prototype for a 200-W PV module. © 1986-2012 IEEE.
Kwon S.-D.,Chonbuk National University
Applied Physics Letters | Year: 2010
This paper proposes a T-shaped piezoelectric cantilever for generating electric power from fluid flow. The working principle of the device is based on aeroelastic flutter and utilizes a bimorph cantilever with T-shape which hastens occurrence of flutter at a low fluid speed. A prototype device (100×60×30 mm3) was tested in a wind tunnel. The device was found to provide power from a wind speed of 4 m/s and a continuous peak electrical power output of 4.0 mW. The simplicity of the present device consisting of only a bimorph cantilever is considered to be cost effective. © 2010 American Institute of Physics.
Park M.-S.,Chonbuk National University
Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association | Year: 2014
PURPOSE: The aim of this study was to assess complications related to arthroscopy for femoroacetabular impingement (FAI) and how these complications have changed as we have gained more experience with this procedure.METHODS: The authors reviewed 200 hips (197 patients). The average patient age was 44.64 years and the mean follow-up time was 28.2 months. All patients underwent hip arthroscopy in the supine position. Clinically, Modified Harris Hip Scores (MHHS) and patient satisfaction with outcome were used. We divided complications into 3 groups: Group 1 related to traction, group 2 related to surgical technique or implant failure, and group 3 related to outcomes.RESULTS: Clinically, the MHHS improved from 69.96 (±6.10) to 80.45 (±7.00), and patient satisfaction with the achieved outcome increased to 8.87 (±0.76). The overall complication rate was 15% (30 of 200 hips). Group 1 consisted of 4 patients with pudendal neuropraxia and 2 patients with ankle joint pain (P = .013). Group 2 consisted of 2 patients with lateral femoral cutaneous neuropraxia, 2 patients with iatrogenic labral perforations, one patient with a labral tear, and 4 patients with femoral head scuffs. There were 4 incidents of instrument breakage. Furthermore, 3 suture anchors failed, a second-degree burn occurred in one patient, and there was incomplete reshaping in 5 hips (P = .045). Group 3 included one patient with a snapping sound and heterotopic ossification. Second-look arthroscopy was performed for 5 hips. All the complications outlined in groups 1 and 2 are related to the learning curve and have statistical significance (P < .05).CONCLUSIONS: Complications relating to hip arthroscopy took different forms during the early learning period, but overall complication rates decreased along the learning curve. Surgical technique-related complications such as problems with suture anchors and the reshaping of cam impingements were also considered during the later stage.LEVEL OF EVIDENCE: Level IV, therapeutic case series. Copyright © 2014 Arthroscopy Association of North America. Published by Elsevier Inc. All rights reserved.
Chonbuk National University | Date: 2015-01-04
An inertial control method of a wind turbine includes the steps of: acquiring frequency information of a power grid; calculating a time variant droop coefficient when the frequency information is reduced below a preset range; and controlling the wind turbine using the calculated time variant droop coefficient, wherein the step of calculating a time variant droop coefficient includes the steps of: collecting rotor speed information changing according to the inertial control; and calculating the time variant droop coefficient using the collected rotor speed information.