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Search Results: 1 - 10 of 24092 matches for " Kyu-Jung Kim "
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SHOCK-ABSORBING EFFECTS OF VARIOUS PADDING CONDITIONS IN IMPROVING EFFICACY OF WRIST GUARDS
Kyu-Jung Kim,Il-Kyu Hwang
Journal of Sports Science and Medicine , 2004,
Abstract: The use of wrist guards has limited efficacy in preventing wrist injuries during falling in many sports activities. The objectives of this study were to measure the ground reaction force of the hand under simulated impact of the forearm and hand complex with different padding conditions of wrist guards and to analyze their impact force attenuation and maximum energy absorption for improved functional efficiency. A total of 15 subjects, wearing a commercial wrist guard, participated in a cable-released hand impact experiment to test four different conditions on the volar aspect of the hand, which include a wrist guard without a volar splint (bare hand), with a volar splint (normal use), with a volar splint and additional viscoelastic polymeric padding, and a volar splint and additional air cell padding. The ground reaction force and acceleration of the hand were measured using a force platform mounted on an anti-vibration table and a miniature accelerometer, respectively. Additional padding on the bare hand could substantially improve the maximum energy absorption by more than 39%, with no differences with each other. However, only the air cell padding could simultaneously improve the impact force attenuation by 32% compared with the bare hand impact without compromising the maximum energy absorption. It is recommended that common wrist guard design should provide more compliant padding in the volar aspect to improve the impact force attenuation through optimal material selection and design
Relationship Between Atmospheric Conditions and Breeding Ecology of Tits in Artificial Nest Boxes
Seung-Hun Son,Kyu-Jung Kim,Hyun-Su Hwang,Shin-Jae Rhim
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.3682.3686
Abstract: This study was conducted to investigate the relationship between atmospheric conditions and breeding ecology of Parus sp. tits in artificial nest boxes at a deciduous forest between March 2009 and July 2010. In order to collect data regarding tit breeding, temperature and relative humidity, researchers installed a total of 45 artificial nest boxes equipped with Hobo Pro V2 monitors. Artificial nest boxes had one of three different entrance diameters of 30, 35 and 40 mm. The mean temperature and relative humidity in 2010 were lower than in 2009. Marsh and great tits both had differences in incubation and nestling care periods based on temperature and relative humidity during the breeding season. In addition, increases in the body weight and tarsus length of juvenile tits were slower in 2010 than in 2009. To understand whether the breeding ecology of tits is affected by atmospheric conditions, further long-term ecological research is needed.
Effect of Forest Road on Stand Structure and Small Mammals in Temperate Forests
Shin-Jae Rhim,Kyu-Jung Kim,Seung-Hun Son,Hyun-Su Hwang
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.2540.2547
Abstract: Researchers examined changes in habitat structure and abundance of three small mammal species, Korean field mice (Apodemus peninsulae), Korean red-backed voles (Myodes regulus) and striped field mice (A. agrarius) between 1st year (the 1st trapping session in 2005) and 4th year (the 2nd trappings session in 2008) after forest road construction within deciduous and coniferous stands in Jincheon, Chungbuk province, South Korea. Forest structure differed significantly between forest edge and interior areas in both stands. Number of standing wood, basal area, coverage of understory vegetation and volume of coarse woody debris were higher in deciduous than in coniferous stands. Researchers captured 5 species of small animals, 1196 times in 4 sites during the 2 trapping sessions. The abundances of the three small mammals varied according to the habitat, generally higher in deciduous stands than in coniferous stands and higher in interior areas than in edge areas. In the 2nd trapping session, the abundance of A. peninsulae and M. regulus had increased and that of A. agrarius had decreased in the forest edge compared with the 1st trapping session. Understory vegetation and woody seedlings were the habitat components most strongly related to small mammal abundance at the edge of forest road. Long-term experiments are needed to elucidate the potential effects of forest road on small mammal species.
Bird Community Characteristics During the Rainy and Dry Seasons in Lowland Dry Evergreen Forests of the Central Cardamom Protected Forest and the Seima Biodiversity Conservation Area in Cambodia
Shin-Jae Rhim,Seung-Hun Son,Kyu-Jung Kim,Hyun-Su Hwang,Woo-Shin Lee
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.4476.4481
Abstract: The goal of this study was to gain a greater understanding of the characteristics of bird communities during the rainy and dry seasons in lowland dry evergreen forests of the Central Cardamom Protected Forest and the Seima Biodiversity Conservation Area in Cambodia during July 2007 and December 2011. The 82 bird species were observed in the Central Cardamom Protected Forest and 72 bird species were observed in the Seima Biodiversity Conservation Area. The number of species and individuals were similar between rainy and dry seasons in both study areas. IUCN (International Union for Conservation of Nature) red list and CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora) listed species such as the green peafowl (Pavo muticus), the Oriental pied hornbill (Anthracoceros albirostris), the great hornbill (Buceros bicornis) and the crested serpent eagle (Spilornis cheela) were recorded in this study. The primary threats to bird communities in and around both study areas were related to habitat conversion and poaching for local consumption. Habitat conversion and poaching should be strictly prohibited to conserve bird communities. Moreover, detailed management programs based on scientific research will be helpful for conservation of biodiversity.
CP violating supersymmetric contributions to the electroweak $ρ$ parameter
Sin Kyu Kang,Jung Dae Kim
Physics , 2000, DOI: 10.1103/PhysRevD.62.071901
Abstract: Effects of CP violation on the supersymmetric electroweak correction to the $\rho$ parameter are investigated. To avoid the EDM constraints, we require that arg$(\mu)<10^{-2}$ and the non-universal trilinear couplings $A_f=(0,0,A_0)$ and also assume that gluinos are heavier than 400 GeV. The CP phase $\phi_t=$ arg($A_0$) leads to large enhancement of the relative mass splittings between $\tilde{t}_2$ and $\tilde{b}_L(\tilde{t}_1)$, which in turn reduces the one-loop contribution of the stop and sbottom to $\Delta \rho$. For small $\tan \beta$, such a CP violating effect is prominent. We also study how much the two-loop gluon and gluino contributions are affected by the CP phase. Possible contributions to the $\rho$ parameter arising from the Higgs sector with CP violation are discussed.
Effect of Hoechunyangkyeok-San Extract on Melanogenesis  [PDF]
Mi Jin Kim, Taek Kyu Jung, Hyun-Chul Park, Kyung-Sup Yoon
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2016, DOI: 10.4236/jcdsa.2016.63011
Abstract: Forsythia fructus has been shown to have antioxidative, anti-inflammatory, antibacterial, anti-aging and whitening effects. Hoechunyangkyeok-san (Forsythia viridissima-prescription) is a traditional herbal medicine, which has been clinically used for treating febrile and inflammatory disorders. This work was carried out to investigate the skin whitening effects of Forsythia viridissima-prescription extract (a hydrolyzed extract of Hoechunyangkyeok-san: SID White HYC) on skin. The effects of SID White HYC were assessed the melanin contents in B161 melanoma cells and the pigmented equivalent with HMB45 and Fontana Masson staining in 3D skin model. Then, we examined the expression of major pigment enzymes regulating melanin synthesis and melanosome transport related proteins in B16F1 cells. SID White HYC significantly inhibited the melanin synthesis (56.7% and 30.6% inhibition at 100 μg/mL, intracellular and secreted, respectively) in B16F1 cells and 3D skin model. In addition, western blotting analysis showed that SID White HYC reduced the expression of melanin synthesis and melanosome transport related proteins in B16F1 cells. In clinical trials, the cream containing 0.05% SID White HYC showed skin depigmentation effect without any irritation. These results suggest that SID White HYC may be useful inhibition of melanogenesis and melanosome transport. Therefore, SID White HYC may have potential as a skin-whitening ingredient in cosmetics.
Effect of Farnesyl Caffeate-Induced Apoptosis of Lung Carcinoma Cell Line from Damage to DNA  [PDF]
Kyu Sik Kim, Akemi Umeyama, Toshihiro Hashimoto, Hyun-Ju Cho, Je-Jung Lee, Masao Takei
Pharmacology & Pharmacy (PP) , 2013, DOI: 10.4236/pp.2013.49096
Abstract:

Farnesyl caffeate, synthesis of propolis and polar bud excretion, has been reported to exhibit anti-allergic effects in mice. However, little is known about anti-tumor effects. In this study, we investigated the effect of Farnesyl caffeate in cell proliferation of lung carcinoma cell line (H157). Antiproliferative effect and apoptosis on H157 cell were evaluated using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay (MTT) and DNA fragmentation assay, respectively. Farnesyl caffeate inhibited the growth of H157 cell in dose-dependent manner. Morphological changes of nuclei by staining Hoechst 33258 and DNA fragmentation suggested that Farnesyl caffeate induced death involved in a mechanism of apoptosis. Moreover, caspase-3, caspase-7 and caspase-9 were activated by Farnesyl caffeate on H157 cell. The protein expressions of Bax and Bcl-2 were down-regulated by Farnesyl caffeate, resulting in cytochrome c release from the mitochondria. Farnesyl caffeate significantly increased the expression of p53 proteins which indicates that p53 plays a pivotal role in the initiation phase of Farnesyl caffeate-induced HepG2 cell apoptosis. These results demonstrated Farnesyl caffeate-induced apoptosis in human lung carcinoma cell line. More detailed mechanism of  Farnesyl caffeate-induced H157 apoptosis remains to be elucidated.

 

Pleomorphic adenocarcinoma of the lacrimal gland with multiple intracranial and spinal metastases
Jung Ahn, Jong Chang, Se Kim, Kyu Lee
World Journal of Surgical Oncology , 2007, DOI: 10.1186/1477-7819-5-29
Abstract: A 50-year-old woman presented with malignant transformation associated with both intracranial invasion and multiple intracranial and spinal disseminations in the third recurrence of pleomorphic adenoma of the lacrimal gland, 6 years after initial treatment. MRI demonstrated increased extent of orbital mass, extending to the cavernous sinus. The patient underwent intensity-modulated radiation therapy (IMRT) and Gamma Knife radiosurgery. Follow-up MRI showed multiple leptomeningeal disseminations to the intracranium and spine.It is important to recognize that leptomeningeal intracranial and spinal disseminations of pleomorphic adenocarcinoma can occur, although it is extremely rare. To our knowledge, we report the first case of pleomorphic adenocarcinoma of the lacrimal gland presumably metastasizing to the intracranium and spine.Pleomorphic adenomas are the most common benign epithelial tumors affecting the lacrimal gland [1]; however, their malignant counterpart, the malignant mixed tumor, is much less common [2]. Pleomorphic adenoma is known to recur and also to undergo malignant transformation when incompletely excised [3,4].Even if such a malignant change occurs, intracranial direct invasion and intracerebral and spinal metastases are seldom encountered, because the tumor itself is well demarcated [5]. We present a case of malignant transformation associated with both intracranial invasion and multiple intracranial and spinal disseminations in the third recurrence of pleomorphic adenoma of the lacrimal gland, 6 years after initial treatment. We also describe an initial experience with gamma knife radiosurgery for intracranial invasion. To the best of our knowledge, this is the first report of pleomorphic adenocarcinoma with presumed multiple intracranial and spinal metastases treated with Gamma Knife radiosurgery.A 50-year-old woman had lacrimal mass presented with progressive exophthalmos and visual disturbance in the left eye in 2000. Orbital CT scan showed a w
Detection of 16SrII Group Phytoplasma in China Aster (Callistephus chinensis)
Win, Nang Kyu Kyu;Kim, Young-Hwan;Chung, Heewon;Jung, Hee-Young;
Tropical Plant Pathology , 2011, DOI: 10.1590/S1982-56762011000300007
Abstract: china aster, callistephus chinensis, is widely grown in myanmar as an ornamental plant. symptoms of flower virescence were observed in diseased china aster plants in yezin, myanmar. the presence of a phytoplasma was detected and identified by applying polymerase chain reaction (pcr)/ restriction fragment length polymorphism (rflp) techniques and sequencing the 16s ribosomal dna. the phytoplasma was identified as belonging to ribosomal subgroup 16srii-a, never reported before in china aster. it showed almost 100 % similarity with a 16s rdna sequence of sunn hemp witches' broom phytoplasma (ab558143), which belongs to the peanut witches' broom phytoplasma group. this is the first record of china aster as a new host for a subgroup 16srii-a phytoplasma.
Effect of Acute and Fractionated Irradiation on Hippocampal Neurogenesis
Min-Kyoung Park,Seolhwa Kim,Uhee Jung,Insub Kim,Jin Kyu Kim,Changhyun Roh
Molecules , 2012, DOI: 10.3390/molecules17089462
Abstract: Ionizing radiation has become an inevitable health concern emanating from natural sources like space travel and from artificial sources like medical therapies. In general, exposure to ionizing radiation such as γ-rays is one of the methods currently used to stress specific model systems. In this study, we elucidated the long-term effect of acute and fractionated irradiation on DCX-positive cells in hippocampal neurogenesis. Groups of two-month-old C57BL/6 female mice were exposed to whole-body irradiation at acute dose (5 Gy) or fractional doses (1 Gy × 5 times and 0.5 Gy × 10 times). Six months after exposure to γ-irradiation, the hippocampus was analyzed. Doublecortin (DCX) immunohistochemistry was used to measure changes of neurogenesis in the subgranular zone (SGZ) of the hippocampal dentate gyrus (DG). The number of DCX-positive cells was significantly decreased in all acute and fractionally irradiation groups. The long-term changes in DCX-positive cells triggered by radiation exposure showed a very different pattern to the short-term changes which tended to return to the control level in previous studies. Furthermore, the number of DCX-positive cells was relatively lower in the acute irradiation group than the fractional irradiation groups (approximately 3.6-fold), suggesting the biological change on hippocampal neurogenesis was more susceptible to being damaged by acute than fractional irradiation. These results suggest that the exposure to γ-irradiation as a long-term effect can trigger biological responses resulting in the inhibition of hippocampal neurogenesis.
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