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Kim S.K.,Joongbu University
International Journal of Marine and Coastal Law | Year: 2017

Despite a great number of negotiations between China and Korea, the two countries have failed to delimit a maritime boundary in the Yellow Sea and the East China Sea. Primarily they have held conflicting principles regarding maritime boundary delimitation, namely an equidistant line as opposed to the natural prolongation of the land territory. Ieodo, a submerged rock in a strategic location, claimed by both China and Korea, is also another focus of negotiations. Other factors, including straight baselines, military activities, fishery and underwater mineral resources, are also important considerations in the maritime boundary negotiations. © 2017 Koninklijke Brill NV, Leiden, The Netherlands.

Background: There have been few studies about pain using a big data. The purpose of this study was to identify the prevalence of pain, and trends of pain associated with chronic diseases and personal out-of-pocket medical expenditures over time. Methods: Subjects were 58,151 individuals, using the Korea Health Panel from 2009 to 2013. Chi-square and multinomial logistic regression were conducted to identify the prevalence and odds ratios (ORs) of pain. Repeated measures ANOVA was used to find the trend over these 5 years. Results: Prevalence of mild and severe pain was 28.1% and 1.7% respectively. The ORs of mild and severe pain were 1.6 and 1.4 in females compared with males. From 2009 to 2013, numbers of chronic diseases producing mild pain were 2.1, 2.4, 2.8, 2.9, and 3.1 and those producing severe pain were 3.0, 3.4, 3.9, 4.2, and 4.4, respectively. After applying the average South Korean inflation rate by year over 5 years, the annual, personal out-of-pocket medical expenditures (unit: W1,000) for mild pain were 322, 349, 379, 420, and 461, and those for severe pain were 331, 399, 504, 546, and 569, respectively (P < 0.0001). Conclusions: The pain prevalence was 29.8%. The numbers of chronic diseases and the personal out-of-pocket medical expenditures revealed increasing trends annually, especially in those with pain. Therefore, to eliminate and alleviate the pain, there needs to be further study for developing a systemic approach. © The Korean Pain Society, 2017.

Park J.-J.,Joongbu University
Transactions of the Korean Institute of Electrical Engineers | Year: 2016

AC and DC insulation breakdown voltage was studied for magnet wire coated with double layers of high flexural PAI layer and high anti-corona PAI/nanosilica (15 wt%) layer. The specimens were prepared at various drying temperatures (T/D): 220oC, 240oC, and 260oC, respectively. The increase effects of nanosilica on AC and DC insulation breakdown voltage were not so significant compared to that of magnet wire coil coated with original PAI. And the AC and DC insulation breakdown voltage was improved by decreasing diameter of winding coil. As T/D temperature increased, AC and DC insulation breakdown voltage decreased. © The Korean Institute of Electrical Engineers.

The most common structure used for current transformers (CTs) consists of secondary windings around a ferromagnetic core past the primary current being measured. A CT used as a surge protection device (SPD) may experience large inrushes of current, like surges. However, when a large current flows into the primary winding, measuring the magnitude of the current is difficult because the ferromagnetic core becomes magnetically saturated. Several approaches to reduce the saturation effect are described in the literature. A Rogowski coil is representative of several devices that measure large currents. It is an electrical device that measures alternating current (AC) or high-frequency current. However, such devices are very expensive in application. In addition, the volume of a CT must be increased to measure sufficiently large currents, but for installation spaces that are too small, other methods must be used. To solve this problem, it is necessary to analyze the magnetic field and electromotive force (EMF) characteristics when designing a CT. Thus, we proposed an analysis method for the CT under an inrush current using the time-domain finite element method (TDFEM). The input source current of a surge waveform is expanded by a Fourier series to obtain an instantaneous value. An FEM model of the device is derived in a two-dimensional system and coupled with EMF circuits. The time-derivative term in the differential equation is solved in each time step by the finite difference method. It is concluded that the proposed algorithm is useful for analyzing CT characteristics, including the field distribution. Consequently, the proposed algorithm yields a reference for obtaining the effects of design parameters and magnetic materials for special shapes and sizes before the CT is designed and manufactured. © 2017 Author(s).

News Article | May 9, 2017

SEOUL, SOUTH KOREA, May 09, 2017-- Dr. ChiYoung Park has been included in Marquis Who's Who. As in all Marquis Who's Who biographical volumes, individuals profiled are selected on the basis of current reference value. Factors such as position, noteworthy accomplishments, visibility, and prominence in a field are all taken into account during the selection process.Having accrued many years of experience in the health care field, Dr. Park now lends his talents to Saengki Oriental Medical Clinic as a Representative Oriental Medical Doctor. Additionally, he is an adjunct professor at both Daejeon University and Joongbu University -- institutions where he focuses on teaching students about oriental medicine and skin beauty treatments, respectively.An alumnus of Daejeon University's Department of Oriental Medicine, Dr. Park holds a Ph.D. and an MD. A well-noted physician in his field, he participated as a representative in the field of oriental medicine in the Atopy Forum held by the Health and Welfare Committee, the 2013 World's Traditional Medicine Expo, the "Atopy Healing Forest" National Project, and in atopy prevention programs held by the Chungcheongnamdo Education Office, and the Health Center of Gyeryong, Nonsan, Jinju Province. Additionally, Dr. Park serves as a consultant oriental medical doctor of MBC Health Plus. He appeared on the television show 'Chunkinoosul' and has lectured on pregnancy and childcare.Dr. Park has conducted a variety of research projects regarding the suppression of asthma and the control of immunity through the application of Chinese balloon-flower herbal acupuncture. Further, he has studied the development of moxibution exclusive in treating warts, Saengki herbal acupuncture to treat dermatopathy, and moistness dressing for the first time in Korea. In fact, for the past two years, Dr. Park has been working on developing a medical face pack exclusive to the treatment of dermatopathy.Dr. Park served his country at a public health center for three years (2003-2006) and is an active member of the Society of Korean Atopy, Korean Medicine Dermatology Institute, Society of Korean Medicine, and Korean Pharmacopuncture (herbal acupuncture) Institute. In recognition of his accomplishments, he was presented with the Korean Medical Representative Brand Great Award in Best Medical Clinic of Inveterate Dermatopathy, served as the chairman of the awarding committee of the National Assembly Health and Welfare Committee, and received the 2015 Korea TOP Brand Great Award in Korean Medical Treatment of Dermatopathy.About Marquis Who's Who :Since 1899, when A. N. Marquis printed the First Edition of Who's Who in America , Marquis Who's Who has chronicled the lives of the most accomplished individuals and innovators from every significant field of endeavor, including politics, business, medicine, law, education, art, religion and entertainment. Today, Who's Who in America remains an essential biographical source for thousands of researchers, journalists, librarians and executive search firms around the world. Marquis publications may be visited at the official Marquis Who's Who website at

Park J.-J.,Joongbu University | Lee J.-Y.,Woosuk University
IEEE Transactions on Dielectrics and Electrical Insulation | Year: 2010

A new electric application method was developed to prepare epoxy/organoclay nanocomposite for the electrical insulation in the ac electric fields and it could be also used in the field of various viscous polymer/organoclay systems. The applied ac electric field condition was as follows; (1) inter-electrode distance: 40 mm, (2) application voltage: 3-11 kV, (3) frequency: 60-1,000 Hz, and (4) application time: 0-60 min. To characterize the epoxy/clay nanocomposite, WAXS and TEM analyses were performed. In order to explain how the organic modifier affects the exfoliation phenomena, a mechanism of the oscillating collision of the quaternary ammonium head was proposed and the effects of the ac voltage and frequency and the organoclay content were studied. © 2010 IEEE.

Park J.-J.,Joongbu University
Transactions on Electrical and Electronic Materials | Year: 2013

In order to develop electrical insulation material, organically modified layered silicate was incorporated into an epoxy matrix to prepare nanocomposite. Transmission electron microscopy (TEM) observation showed that organophillic clay was in an exfoliated state, while hydrophilic clay was not dispersed into nanolayers within the epoxy matrix. Epoxy/organophilic clay (2.8 wt%) nanocomposite was mixed and cured at 150°C for 4.5 hr. I-V characteristics, volume resistance and dielectric properties for the cured nanocomposite were estimated. Current density increased with increasing temperature, and volume resistance decreased with increasing temperature, in neat epoxy and epoxy/ organophilic clay (2.8 wt%) nanocomposite. As frequency increased, the dielectric loss value decreased in the two systems. Copyright © 2013 KIEEME. All rights reserved.

Park J.-J.,Joongbu University
Transactions on Electrical and Electronic Materials | Year: 2013

In order to develop high voltage (HV) insulation materials, epoxy/spherical alumina composites with two different particle sizes (in μm) were prepared and a dynamic mechanical analysis (DMA) and electrical insulation breakdown strength test were carried out in sphere-sphere electrodes and the data were estimated using Weibull statistical analysis. Alumina content varied from 50 to 70 wt%. The electrical insulation breakdown strength for epoxy/alumina (50 wt%) was 44.0 kV/1 mm and this value decreased with increasing alumina content. The effects of insulation thickness and alumina particle size on the insulation breakdown strength were also studied. The insulation thickness varied from 1 mm to 3 mm, and the particle sizes were 7.3 or 40.3 μm. © 2013 KIEEME. All rights reserved.

Park J.-J.,Joongbu University
Transactions on Electrical and Electronic Materials | Year: 2013

The effects of electric field frequency on the AC electrical treeing phenomena in an epoxy/layered silicate (1.5 wt%) were investigated in a needle-plate electrode arrangement. A layered silicate was exfoliated in an epoxy-base resin with AC electric field apparatus. To measure the treeing initiation and propagationand the breakdown rate, a constant alternating current (AC) of 10 kV with three different electric field frequencies (60, 500, and 1,000 Hz) was applied to the specimen in the needle-plate electrode specimen in an insulating oil bath at130°. At 60 Hz, the treeing initiation time was 12 min, the propagation rate was 0.24 × 10-3 mm/min, and the morphology was a dense branch type. As the electric field frequency increased, the treeing initiation time decreased and the propagation rate increased. At 1,000 Hz, the treeing initiation time was 5 min, the propagation rate was 0.30 × 10-3 mm/min, and the morphology was a dense bush type. © 2013 KIEEME. All rights reserved.

Lee S.-Y.,Joongbu University
Composites Science and Technology | Year: 2010

The finite element dynamic stability analysis of laminated composite skew structures subjected to in-plane pulsating forces is carried out based on the higher-order shear deformation theory (HSDT). The two boundaries of the instability regions are determined using the method proposed by Bolotin. The numerical results obtained for square and skew plates with or without central cutout are in good agreement with those reported by other investigators. The new results for laminated skew plate structures containing cutout in this study mainly show the effect of the interactions between the skew angle and other various parameters, for example, cutout size, the fiber angle of layer and thickness-to-length ratio. The effect of the magnitude of the periodic in-plane load on the dynamic instability index is also investigated. © 2010 Elsevier Ltd.

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