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Search Results: 1 - 10 of 34988 matches for " Nam-Yong Ra2 "
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Preferred Feeding Sites and Prey of the Adult Gold-spotted Pond Frog, Rana plancyi chosenica
Eom, Junho1,Jung-Hyun Lee2,Nam-Yong Ra2,Daesik Park1*
Journal of Ecology and Field Biology , 2007,
Abstract: To determine the feeding sites preferred by adult gold-spotted pond frogs, Rana plancyi chosenica,and the foods that induce favorable growth of the frogs in the laboratory, we conducted two separate experimentsbetween 27 May and 12 July 2007 in a vivarium. In the first experiment, we counted the number of cricketseaten by four gold-spotted pond frogs in a 60 min period at four different feeding sites within the experimentalarenas: on the water surface, at the edge of a pond, and at two terrestrial sites. Adult gold-spotted pond frogsate more crickets on the water surface and at the edge of the pond than the terrestrial sites. In the secondexperiment, we measured the growth of SVL (snout-vent length) and body mass of adult gold-spotted pond frogsfed crickets, mealworms, maggots, or earthworms in individual experimental boxes over a one month period. TheSVL and body mass of the adult gold-spotted pond frogs fed crickets, mealworms, or maggots were greater thanthose of the frogs that were fed earthworms. These results indicate that providing crickets, mealworms, ormaggots on the water or at the edge of a pond should induce favorable growth of captive-reared adult goldspottedpond frogs.
Five-year monitoring of herpetofauna in Woraksan National Park
Jung-Hyun Lee,Nam-Yong Ra,Daesik Park
Journal of Ecology and Field Biology , 2011,
Abstract: In this study, in order to determine how climate change may affect amphibian and reptile communities, we surveyedthe numbers of egg clumps and adults of amphibians and the number of reptiles at eight amphibian and nine reptilesurvey sites in Woraksan National Park from March 2005 to September 2009. We assessed the relationships among sixclimate factors (annual minimum temperature, annual maximum temperature, monthly mean temperature, monthlymean precipitation, monthly mean temperature during winter, and monthly mean precipitation during winter); speciesdiversity, evenness, and richness indexes for both amphibians and reptiles; and the number of each species and eggclumps of three amphibian species. First, both the amphibian and reptile species indices evidenced sudden changes in2007, when climate factors in Korea fluctuated substantially. Second, amphibian diversity and evenness were negativelyrelated with annual minimum temperature. Increased monthly mean precipitation had a positive effect in mountainedge sites, but a negative effect in valley sites. Third, reptile species evenness was positively related with monthly meanprecipitation. In particular, the monthly mean temperature in the winter season affected the numbers of the Dione's ratsnake and the Korean tiger keelback snake. These results indicate that amphibian and reptile communities are respondingto climate change in a variety of ways.
Ovulated female salamander (Hynobius leechii) respond to water currents
Seok-Bum Kim,Jung-Hyun Lee,Nam-Yong Ra,Daesik Park
Journal of Ecology and Field Biology , 2010,
Abstract: To determine whether or not the female Korean salamander, Hynobius leechii, responds to water currents and, if so,whether those responses depend on their reproductive conditions, we evaluated the responses of ovulated and ovipositedfemales to 1-Hz water currents generated by a model salamander with and without the placement of a transparentwater current blocker between the model and the test females. The ovulated females responded to water currentsby turning their heads toward, approaching, and/or making physical contact with the model. When the water currentblocker was in place, the number of salamanders that approached the model was reduced significantly. The approachingand touching responses of ovulated females were greater than those of oviposited females, whereas the other measurementsevidenced no differences. None of the responses of the oviposited females to water currents was affected by thepresence of the blocker. Our results indicate that female H. leechii responds to water currents via a mechanosensorysystem.
Population Dynamics of the Long-Tailed Clawed Salamander Larva, Onychodactylus fischeri, and Its Age Structure in Korea
Lee, Jung-Hyun,Nam-Yong Ra,Junho Eom,Daesik Park
Journal of Ecology and Field Biology , 2008,
Abstract: Larvae of the long-tailed clawed salamander, Onychodactylus fischeri, have a relatively long larval period,spending a year or more within the stream where they hatch; therefore, a well-established larval population could becritical for the conservation of adult populations. To study the population dynamics of long-tailed clawed salamanderlarvae, we surveyed a field population once or twice a month from September, 2005 to June, 2006, and determined theage of larval clawed salamanders collected from three different populations in October, 2004 using skeletochronology. Theage of long-tailed clawed salamander larvae ranged from 0 to 3 years. New recruitment of larvae in the populationprimarily occurred in November, 2005, and mid-March, 2006. Larvae with a snout-vent length of more than 30 mmdisappeared from the streams in September, 2005, suggesting that two to three year-old clawed salamander larvaemetamorphosed during this period.
Ectoparasites: immature Japanese hard ticks (Ixodes nipponensis; Acari: Ixodidae) on Korean lizards
Nam-Yong Ra,Jun-Ki Lee,Jung-Hyun Lee,Ja-Kyeong Kim
Journal of Ecology and Field Biology , 2011,
Abstract: Although lizards are important hosts for hard ticks (Ixodidae), very few studies have been conducted in South Korea. Todetermine whether or not hard ticks can infest lizards endemic to South Korea, we examined 77 lizards of four species(Eremias argus, Sincella vandenburghi, Takydromus amurensis, and Takydromus wolteri) that were collected at 22 differentsites between April and October 2010. We confirmed that all four lizard species can be infested by Ixodes nipponensislarvae or nymphs. Of the 62 E. argus examined, we found an average of 12.5 larvae on two lizards and an averageof one nymph on one lizard. We found seven nymphs on one S. vandenburghi. We found an average of two nymphs ontwo of the five T. amurensis and an average of one nymph on four of the nine T. wolteri. Ixodes nipponensis larvae andnymphs were found most frequently on the foreleg axillae (87.8%), followed by the forelegs (7.3%), the eyelids (2.4%),and the ears (2.4%) of the lizards. To the best of our knowledge, this is the first report of I. nipponensis infestations oflizards endemic to South Korea.
Gel-type autologous chondrocyte (Chondron?) implantation for treatment of articular cartilage defects of the knee
Nam-Yong Choi, Byoung-Woo Kim, Woo-Jin Yeo, Haeng-Boo Kim, Dong-Sam Suh, Jin-Soo Kim, Yoon-Sik Kim, Yong-Ho Seo, Jea-Yeong Cho, Chung-Woo Chun, Hyun-Shin Park, Asode Shetty, Seok-Jung Kim
BMC Musculoskeletal Disorders , 2010, DOI: 10.1186/1471-2474-11-103
Abstract: Data from 98 patients with articular cartilage injury of the knee joint and who underwent Chondron? implantation at ten Korean hospitals between January 2005 and November 2008, were included and were divided into two groups based on the patient follow-up period, i.e. 13~24-month follow-up and greater than 25-month follow-up. The telephone Knee Society Score obtained during telephone interviews with patients, was used as the evaluation tool.On the tKSS-A (telephone Knee Society Score-A), the score improved from 43.52 ± 20.20 to 89.71 ± 13.69 (P < 0.05), and on the tKSS-B (telephone Knee Society Score-B), the score improved from 50.66 ± 20.05 to 89.38 ± 15.76 (P < 0.05). The total improvement was from 94.18 ± 31.43 to 179.10 ± 24.69 (P < 0.05).Gel-type autologous chondrocyte implantation for chondral knee defects appears to be a safe and effective method for both decreasing pain and improving knee function.As articular cartilage has only limited ability to regenerate, many treatment modalities have been developed during the past several decades to treat symptomatic articular cartilage injuries [1]. Among these treatment modalities, autologous chondrocyte implantation (ACI) has become a standard technique used to repair symptomatic, full-thickness, chondral injuries [2-4].The traditional ACI technique involves injection of cultured autologous cartilage cells into the prepared cartilage defect which is covered by a periosteal flap. The technique requires extensive surgical exposure in order for the sutures to be watertight as well as an additional incision for harvesting the periosteum. In addition, cell leakage, graft detachment, and graft hypertrophy are recognized as potential problems [5].To solve the periosteum-associated problems, many biomaterials have also been used for a new generation of ACI techniques in which cells are combined with bioactive, resorbable biomaterials such as collagen membrance [6], hyaluronan polymer [7], and copolymers of polylactin and pol
Random forest classifier combined with feature selection for breast cancer diagnosis and prognostic  [PDF]
Cuong Nguyen, Yong Wang, Ha Nam Nguyen
Journal of Biomedical Science and Engineering (JBiSE) , 2013, DOI: 10.4236/jbise.2013.65070

As the incidence of this disease has increased significantly in the recent years, expert systems and machine learning techniques to this problem have also taken a great attention from many scholars. This study aims at diagnosing and prognosticating breast cancer with a machine learning method based on random forest classifier and feature selection technique. By weighting, keeping useful features and removing redundant features in datasets, the method was obtained to solve diagnosis problems via classifying Wisconsin Breast Cancer Diagnosis Dataset and to solve prognosis problem via classifying Wisconsin Breast Cancer Prognostic Dataset. On these datasets we obtained classification accuracy of 100% in the best case and of around 99.8% on average. This is very promising compared to the previously reported results. This result is for Wisconsin Breast Cancer Dataset but it states that this method can be used confidently for other breast cancer diagnosis problems, too.

Synergistic inhibition of mesothelioma cell growth by the combination of clofarabine and resveratrol involves Nrf2 downregulation
Yoon-Jin Lee1,2, Jae-Hyuk Im3, David M. Lee4, Ji-Sung Park3, Seong Youn Won2, Moon-Kyun Cho2, Hae-Seon Nam2, Yong-Jin Lee1 & Sang-Han Lee1,3,*
BMB Reports , 2012,
Abstract: We previously reported that MSTO-211H cells have a highercapacity to regulate Nrf2 activation in response to changes inthe cellular redox environment. To further characterize itsbiological significance, the response of Nrf2, a transcriptionfactor that regulates ARE-containing genes, on the synergisticcytotoxic effect of clofarabine and resveratrol was investigatedin mesothelioma cells. The combination treatment showed amarked growth-inhibitory effect, which was accompanied bysuppression of Nrf2 activation and decreased expression ofheme oxygenase-1 (HO-1). While transient overexpression ofNrf2 conferred protection against the cytotoxicity caused bytheir combination, knockdown of Nrf2 expression using siRNAenhanced their cytotoxic effect. Pretreatment with Ly294002, aPI3K inhibitor, augmented the decrease in HO-1 level by theircombination, whereas no obvious changes were observed inNrf2 levels. Altogether, these results suggest that the synergisticcytotoxic effect of clofarabine and resveratrol was mediated, atleast in part, through suppression of Nrf2 signaling.
Development of Fault Management Dispatcher Training Simulator for TDAS in Korea  [PDF]
In-Yong Seo, Sang-Ok Kim, Bok-Nam Ha
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.51B002

A fault management dispatcher training simulator for large-scale Distribution Automation System (TDAS) is developed to train operators in distribution control center. This simulator is composed of independent simulation server and operator consoles and can be used for network analysis, network operation, fault management and evaluation. TDAS DB is duplicated online to the simulation server keeping the data security. The system can model distribution network penetrated with distributed generations (DG) using the real data from the TDAS DB. Network fault scenarios are automatically generated by calculating fault current and generating fault indicators. Also, manual entry of cry wolf alarm is available. Moreover, operation solution for scenario of fault isolation and service restoration is generated automatically so that trainee can check their operation result. Operator actions during training session are saved and can be played back as well as displayed on one-line diagram pictures.

Stretchable Strain Sensors Fabricated by Screen Printing of Silver Paste on the Surface Modified Transparent Elastomeric Polyurethane Films  [PDF]
Chang Gyu Lee, Bo Seok Kwon, Hyun Min Nam, Duck Min Seo, Jinwoo Park, Hyuc Hwangbo, Lee Soon Park, Su Yong Nam
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.913073
Abstract: Strain sensors for human-motion detection must offer high stretchability, high sensitivity, fast response, and high recovery speed. In this study, we choose silver paste as a sensing material and use a screen printing method to fabricate the strain sensor based upon an electrical-resistance mechanism. After curing elastomeric polyurethane film with a thickness of 150 μm on PET film, the polyester resin mixed with blocked isocyanate curing agent was coated as a masking layer to reduce the film’s stickiness. The effect of the polyester masking layer upon the silver paste screen printing process was examined using a rolling-ball-tack test, TGA analysis of polyester resins, and cured silver-electrode films. The cost-effective strain sensor fabricated by using silver paste and screen printing processes on the stretchable-polyurethane-substrate film showed high sensitivity and fast response in a strain range of up to 100%.
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