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Search Results: 1 - 10 of 20455 matches for " Jungcheol Kim "
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Anomalous polarization dependence of Raman scattering and crystallographic orientation of black phosphorus
Jungcheol Kim,Jae-Ung Lee,Jinhwan Lee,Hyo Ju Park,Zonghoon Lee,Changgu Lee,Hyeonsik Cheong
Physics , 2015, DOI: 10.1039/C5NR04349B
Abstract: We investigated polarization dependence of the Raman modes in black phosphorus (BP) using five different excitation wavelengths. The crystallographic orientation was determined by comparing polarized optical microscopy with high-resolution transmission electron microscope analysis. In polarized Raman spectroscopy, the B2g mode shows the same polarization dependence regardless of the excitation wavelength or the sample thickness. On the other hand, the Ag1 and Ag2 modes show a peculiar polarization behavior that depends on the excitation wavelength and the sample thickness. The thickness dependence can be explained by considering the anisotropic interference effect due to birefringence and dichroism of the BP crystal, but the wavelength dependence cannot be explained. We propose a simple and fail-proof procedure to determine the orientation of a BP crystal by combining polarized Raman scattering with polarized optical microscopy.
Photocurrent generation at ABA/ABC lateral junction in tri-layer graphene photodetector
Minjung Kim,Seon-Myeong Choi,Ho Ang Yoon,Sun Keun Choi,Jae-Ung Lee,Jungcheol Kim,Sang Wook Lee,Young-Woo Son,Hyeonsik Cheong
Physics , 2015, DOI: 10.1016/j.carbon.2015.09.095
Abstract: Metal-graphene-metal photodetectors utilize photocurrent generated near the graphene/metal junctions and have many advantages including high speed and broad-band operation. Here, we report on photocurrent generation at ABA/ABC stacking domain junctions in tri-layer graphene with a responsivity of 0.18 A/W. Unlike usual metal-graphene-metal devices, the photocurrent is generated in the middle of the graphene channel, not confined to the vicinity of the metal electrodes. The magnitude and the direction of the photocurrent depend on the back-gate bias. Theoretical calculations show that there is a built-in band offset between the two stacking domains, and the dominant mechanism of the photocurrent is the photo-thermoelectric effect due to the Seebeck coefficient difference.
Hepatoprotective Activity of Licorice Water Extract against Cadmium-Induced Toxicity in Rats
Jong Rok Lee,Sook Jahr Park,Hyeung-Sik Lee,Seon Young Jee,Jungcheol Seo,Young Kyu Kwon,Taeg Kyu Kwon,Sang Chan Kim
Evidence-Based Complementary and Alternative Medicine , 2009, DOI: 10.1093/ecam/nem078
Abstract: Licorice is commonly used as a cure for digestive disorders and as a detoxification agent in East Asia. This study investigated the protective effect of licorice water extract against cadmium (CdCl2, Cd)-induced liver toxicity in rats. To induce acute toxicity, Cd (4 mg/kg body weight) was dissolved in normal saline and intravenously (i.v.) injected into rats. The rats then received either a vehicle or licorice water extract (50, 100 mg/kg/day) for 3 days, and were subsequently exposed to a single injection of Cd 24 h after the last licorice/vehicle treatment. Alanine aminotransferase (ALT), aspartate aminotransferase (AST) and lactate dehydrogenase (LDH) were significantly increased by Cd treatment. In contrast, pretreatment with licorice reduced ALT, AST and LDH. In histopathological analysis, licorice decreased the central necrosis around central veins, the peripheral hemorrhage around portal triads, the percentage of degenerative hepatic regions (%/mm2 hepatic parenchyma) and the number of degenerative hepatic cells (N/100 hepatic cells). Licorice also inhibited the increment of Bad (a BH3 domain-containing protein) translocation by Cd in liver cells. These results demonstrate that licorice could have a hepatoprotective effect by inhibiting the translocation of Bad to the mitochondria in Cd-intoxificated rats.
Design of Quantification Model for Ransom Ware Prevent  [PDF]
Donghyun Kim, Seoksoo Kim
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.33C030
Abstract:

The growth of ICT within the society has become increasingly digitized, thus, the overall activity has amounted to various researches for protecting any data from malicious threats. Recently, ransomware has been a rapidly propagated subject for social engineering techniques especially the ransomware. Users can delete a ransomeware code using an antivirus software code. However, the encrypted data would be impossible to recover. Therefore, ransomware must be prevented and must have early detection before it infects any data. In this paper, we are proposing a quantification model to prevent and detect any cryptographic operations in the local drive.

Trends of Noninvasive Radiofrequency and Minimally Invasive Treatment for the Management of Facial Aging  [PDF]
Sunghee Kim, Moonjong Kim
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2019, DOI: 10.4236/jcdsa.2019.91003
Abstract: Various treatments for the management of facial aging have been performed among which noninvasive radio-frequency (RF; i.e., thermage) treatment and minimally invasive treatments are on the rise. The purpose of this study was to analyze trends of the treatment of facial aging in Korea and to investigate relationships between the use of noninvasive RF and minimally invasive treatments. A retrospective analysis conducted on data from 4021 patients showed that thermage treatment increased by 134.9% over 5 years. As a person ages, the rate of facial treatment with both the botulinum toxin (for the masseter and lines of the glabella, lateral canthus, and forehead) and the PDO thread lift increases. The use of the treatments, nasolabial fold filler and Silhouette Soft Thread, however, was not associated with aging. The patients receiving thermage treatment were less likely to undergo any of the other treatments including PDO thread lift, Silhouette Soft Thread, nasolabial fold filler, or any of the botulinum toxin treatments. Overall, the results showed that patients who had received noninvasive RF tended to receive less minimally invasive treatment.
The Effect of Prunella on Anti-Inflammatory Activity in RAW264.7 Mouse Macrophage Cells  [PDF]
Meehye Kim
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.39170
Abstract: The extracts of Prunella vulgaris L. (Labiatae), a popular Western and Chinese herbal medicine, was shown to have anti-inflammatory properties, which might be due to partially, their rosmarinic acid content. Inhition of prostaglandine E2 (PGE2) production in lipopolysaccharide (LPS) stimulated RAW264.7 mouse macrophage cells was assessed with an enzyme immunoassay (EIA) following 8-hour treatments with Prunella vulgaris extracts or fractions. Results showed that 95% ethanol extracts from P. vulgaris significantly inhibited PGE2 production. In further studies, fraction 2 from the 95% ethanol extract of P. vulgaris significantly reduced PGE2 production at 66 µg/ml (72% reduction). Cytotoxic-ity did not play a role in the noted reduction of PGE2 seen in either the extracts or fractions from P. vulgaris. High performance liquid chromatography analysis showed that there was 1.4 mM rosmarinic acid in 95% ethanol Prunella extract (201 mg/ml crude extract). Our results suggest that rosmarinic acid may contribute toward the anti-inflammatory activity of Prunella in a dose-response manner. Prunella might have a potential to be used as a functional food for anti-inflammatory activity.
An Effect of the Elastic Energy Stored in the Muscle-Tendon Complex at Two Different Coupling-Time Conditions during Vertical Jump  [PDF]
Sukwon Kim
Advances in Physical Education (APE) , 2013, DOI: 10.4236/ape.2013.31002
Abstract:

A study was performed to evaluate effects of elastic energy stored pre-stretch on the mechanical work output while performing vertical jump. Eight male volunteers of age between 21-29 years old participated in the present study. The present study hypothesized that the vertical jump height during countermovement jumps (CMJ) would be higher than that during squat jump (SJ). During squat jump, a volunteer paused 0.5 sec before making upward movement. The results showed that ground reaction forces and vertical jump displacements were higher in CMJ in comparison to SJ. The study concluded that part of the positive work measured did derive from the recoil of the elastic component of the muscle-tendon complex.

Material Resource Planning (MRP): Will You Need MRP without the Customer?  [PDF]
Kwahng Kim
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.24027
Abstract: The objective of this paper is to introduce a new philosophy that when integrated with existing methodologies, will improve customer service within the manufacturing sector. This paper intends to provide the reader with an understanding that the entire operation has to be involved and collectively focused in order to continuously exceed customer expectations. Short falls of existing systems will be examined with a key focus on the importance of not tying all expectations on MRP, a historical algorithmic electronic scheduling system.
A Study for Building Smart Home Environment Based on Modular Equipment Design Concept  [PDF]
Seokjin Kim
Art and Design Review (ADR) , 2015, DOI: 10.4236/adr.2015.32007
Abstract: In this paper, we propose a modular equipment design concept for building smart-home environment, which can deal with the problems such as life expectancy and complicated cable networks. Recently, the advancement of digital technology in residential networking and connections (i.e., internet cables, power cables, and network cables) has made a positive alteration to the interspatial relationship between appliances. Moreover, the interaction and communication between user and application has understood progressive changes. In future home environment, the living room is a place that has become a haven for the family and a place for entertainment as well. The downside of the new technologies is the life expectancy of the product, which is affected by a simple change to the development of digital technology.
The Impacts of Nonnative Japanese Eelgrass (Zostera japonica) on Commercial Shellfish Production in Willapa Bay, WA  [PDF]
Kim Patten
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.57066
Abstract:

Eelgrass species worldwide are valued for the ecosystem service they provide to estuarine and marine habitats. One species, Zostera japonica, however, has some negative impacts outside its native range and is considered invasive. In Willapa Bay WA, USA, the nonnative eelgrass has expanded to the level where the shellfish industry is concerned about its potential impacts on its livelihood. Studies were conducted using paired plots, Z. japonica controlled with the herbicide imazamox vs. untreated controls, to assess the effects of Z. japonica on Manila clams (Ruditapes philippinarum) and Pacific oysters (Crassostrea gigas). Recruitment of new Manila clams was not affected by Z. japonica. The growth of young clams, total commercial clam harvests, clam quality and clam harvest efficiency, however, were greater on plots where Z. japonica was chemically controlled than where it was not treated. The response of oysters to Z. japonica control varied by site; there was no effect at one site, while the other sites had a 15% increase in shucked meat with Z. japonica control. The potential economic impact of a

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