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Search Results: 1 - 10 of 9921 matches for " Woo-Dae Park "
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The Cerebral Hemodynamic Correlates of Quantitative EEG to The Right Cranial Cervical Ganglion Block in Beagle Dogs
Woo-Dae Park,Young-Sook Lee
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.2414.2420
Abstract: The sympathetic nerves act on changes in cerebral blood flow. These changes have been related to changes in brain waves. Therefore, we investigated the hypothesis that changes in brain waves could be affected by changes in cerebral blood flow following a block of the Cranial Cervical Ganglion (CCG) in dogs. A total of 25 healthy beagle dogs were divided into 3 groups. Group 1 (no. = 10) underwent a block of the right CCG (rCCGB) using 1% lidocaine. Group 2 (no. = 10) served as a control for group 1. This group was injected with 1% lidocaine into the right or left side digastric muscle. Group 3 (no. = 5) served as a control for groups 1 and 2. This group underwent rCCGB using saline. After injecting drugs into the digastric muscles or CCGB, the quantitative EEG (95% spectral edge frequency (95% SEF), the Median Frequency (MF) and the relative band power ( , , , ), : ratio) was measured at 5, 10, 15, 20, 25 and 30 min for each 1 min. There was a 95% SEF increase in group 1 at 20 min and the MF was significantly decreased at 5 min and significantly increased at 15 min compared to those of the other groups (p<0.05). In the relative band power, the low frequencies ( , ) were significantly increased while the high frequencies ( , ) were decreased at 5 min (p<0.05). Thereafter, the low frequencies ( , ) were significantly decreased and the high frequency ( , ) was significantly increased between 10 and 20 min (p<0.05). The : ratio showed that the value decreased in the right frontal lobe. The results suggest that the rCCGB is expected to be useful in the treatment of neural and cerebral disorders in dogs because the block has a significant effect on the change of the Cerebral Blood Flow Rate (CBFr).
The Effect of Saphenous Nerve Block on the Surgical Stress Induced by Pain Following the Surgical Realignment of Medial Patellar Luxation in Dogs
Woo-Dae Park,Ki-Rae Cho,Young-Sook Lee,Chun Sik Bae,Sung Chul Lim
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.2270.2275
Abstract: The purpose of this study was to verify the efficacy of a Saphenous Nerve Block (SNB) in the decrease of surgical stress induced by post-operative pain following surgical realignment of the medial patellar luxation in dogs. All subjects were divided into 3 groups according to post-operative analgesic methods: a group with SNB (Sn, n = 5), a group with the intra-articular injection using bupivacaine (Ac, n = 5) and a control group with SNB using saline (Ct, n = 5). Surgical stress from pain was assessed at variable times after surgery using Heart Rate Variability (HRV), a Numerical Rating Scale (NRS) and measurement of blood glucose level. No significant differences in HRV were found between the Sn and Ac groups while there were significant differences between the Ac and control groups. However, the LF of the Sn group was significantly higher than that of the Ct group at 30 min. The values of the NRS in the Ac and Sn groups decreased significantly more than that of the Ct group. However, no statistical differences were found in the NRS between the Ac and Sn groups. There were no statistical differences among the groups in terms of blood glucose levels. Some evidence was found to suggest that SNB for pain reduction after realignment surgery of the medial patellar luxation in dogs is an easy technique to acquire some analgesic effects. However, the single use of SNB for pain control in realignment surgery of the medial patellar luxation is not recommended because of its weak analgesic effects.
Wireless Sensor Network-Based Greenhouse Environment Monitoring and Automatic Control System for Dew Condensation Prevention
Dae-Heon Park,Jang-Woo Park
Sensors , 2011, DOI: 10.3390/s110403640
Abstract: Dew condensation on the leaf surface of greenhouse crops can promote diseases caused by fungus and bacteria, affecting the growth of the crops. In this paper, we present a WSN (Wireless Sensor Network)-based automatic monitoring system to prevent dew condensation in a greenhouse environment. The system is composed of sensor nodes for collecting data, base nodes for processing collected data, relay nodes for driving devices for adjusting the environment inside greenhouse and an environment server for data storage and processing. Using the Barenbrug formula for calculating the dew point on the leaves, this system is realized to prevent dew condensation phenomena on the crop’s surface acting as an important element for prevention of diseases infections. We also constructed a physical model resembling the typical greenhouse in order to verify the performance of our system with regard to dew condensation control.
An Experimental Study on the Fabrication of Glass-based Acceleration Sensor Body Using Micro Powder Blasting Method
Dong-Sam Park,Dae-Jin Yun,Myeong-Woo Cho,Bong-Cheol Shin
Sensors , 2007, DOI: 10.3390/s7050697
Abstract: This study investigated the feasibility of the micro powder blasting technique for the micro fabrication of sensor structures using the Pyrex glass to replace the existing silicon-based acceleration sensor fabrication processes. As the preliminary experiments, the effects of the blasting pressure, the mass flow rate of abrasive and the number of nozzle scanning times on erosion depth of the Pyrex and the soda lime glasses were examined. From the experimental results, optimal blasting conditions were selected for the Pyrex glass machining. The dimensions of the designed glass sensor was 1.7×1.7×0.6mm for the vibrating mass, and 2.9×0.7×0.2mm for the cantilever beam. The machining results showed that the dimensional errors of the machined glass sensor ranged from 3 μm in minimum to 20 μm in maximum. These results imply that the micro powder blasting method can be applied for the micromachining of glass-based acceleration sensors to replace the exiting method.
Combination therapy of disseminated coccidioidomycosis with caspofungin and fluconazole
Dae Park, Jang Sohn, Hee Cheong, Woo Kim, Min Ja Kim, Je Hyeong Kim, Chol Shin
BMC Infectious Diseases , 2006, DOI: 10.1186/1471-2334-6-26
Abstract: A 31-year-old Korean male with coccidioidomycosis presented to the hospital with miliary infiltrates on chest X-ray (CXR) and skin rash on the face and trunk. Initially, the patient did not respond to amphotericin B deoxycholate therapy. However, following caspofungin and fluconazole combination therapy, the patient showed favourable radiological, serological, and clinical response.This appears to be the first case of diffuse coccidioidal pneumonia with skin involvement in an immunocompetent patient who was treated successfully with caspofungin and fluconazole. Combination therapy with caspofungin and fluconazole may, therefore, be an alternative treatment for diffuse coccidioidal pneumonia that does not respond to amphotericin B deoxycholate therapy.Coccidioidomycosis is an infection caused by inhalation of dimorphic fungi of the genus Coccidioides (C. immitis and C. posadasii). It is endemic in desert regions of the southwestern United States, Central America and South America. This infection has protean manifestations and is frequently misdiagnosed, especially in persons who travel to endemic areas and return to locations where the disease is not typically encountered [1].Diffuse coccidioidal pneumonia is an unusual complication of a primary pulmonary infection in an immunocompetent patient. It has been associated with a high mortality [1,2]. Diffuse bilateral pulmonary infiltrates may be a result of a hematogenous spread. They may also be a result of a multiple foci of infection secondary to high innoculum exposure. In either case, even early infections are regarded as serious enough to warrant therapy [3]. The recommended therapy for diffuse coccidioidal pneumonia has been amphotericin B, followed by an oral azole antifungal after clinical improvement [4,5]. Recently, updated guidelines recommend high-dose fluconazole or amphotericin B for the treatment of diffuse coccidioidal pneumonia [6]. Although amphotericin B is frequently used as initial therapy, the dis
Design of Human Sensibility Model via Color and Gray Information and Its Application to Content-based Image Retrieval
Hun-Woo Yoo,Dong-Sik Jang,Dae-Ki Kim,Dong-Won Park
Asian Journal of Information Technology , 2012,
Abstract: We propose a new emotion-based image retrieval method in this study. Our method was motivated by Soen’s evaluation of human sensibility on color patterns. Thirteen adjective words expressing emotions such as “like”, “beautiful”, “natural”, “dynamic”, “warm”, “gay”, “cheerful”, “unstable”, “light”, “strong”, “gaudy”, “hard”, and “heavy” are modeled by 19-dimensional color array and 4 x 3 gray matrix. Once the query is presented in text format, emotion model-based query formulation produces the associated color array and gray matrix. Then, images related to the query are retrieved from the database based on the multiplication of color array and gray matrix, each of which is extracted from a database image. For experiments over 440 images, we obtained an average retrieval rate of 0.61 for the use of color array and an average retrieval rate of 0.47 for the use of gray matrix.
One-to-One Embedding between Honeycomb Mesh and Petersen-Torus Networks
Jung-Hyun Seo,Hyun Sim,Dae-Heon Park,Jang-Woo Park,Yang-Sun Lee
Sensors , 2011, DOI: 10.3390/s110201959
Abstract: As wireless mobile telecommunication bases organize their structure using a honeycomb-mesh algorithm, there are many studies about parallel processing algorithms like the honeycomb mesh in Wireless Sensor Networks. This paper aims to study the Peterson-Torus graph algorithm in regard to the continuity with honeycomb-mesh algorithm in order to apply the algorithm to sensor networks. Once a new interconnection network is designed, parallel algorithms are developed with huge research costs to use such networks. If the old network is embedded in a newly designed network, a developed algorithm in the old network is reusable in a newly designed network.?Petersen-Torus has been designed recently, and the honeycomb mesh has already been designed as a well-known interconnection network. In this paper, we propose a one-to-one embedding algorithm for the honeycomb mesh (HMn) in the Petersen-Torus PT(n,n), and prove that dilation of the algorithm is 5, congestion is 2, and expansion is 5/3. The proposed one-to-one embedding is applied so that processor throughput can be minimized when the honeycomb mesh algorithm runs in the Petersen-Torus.
Measurement of Urinary N-Telopeptides and Serum C-Telopeptides from Type I Collagen Using a Lateral Flow-Based Immunoassay
Kyoung Min Lee,Min Ho Lee,Chin Youb Chung,Woo Kyeong Seong,Sang Dae Lee,Moon Seok Park
Sensors , 2013, DOI: 10.3390/s130100165
Abstract: Measuring bone turnover markers could detect early stages of osteoporosis and early responses to anti-osteoporotic treatments. Currently, commonly used bone turnover markers, N-telopeptides (NTx) and C-telopeptides (CTx), are measured using ELISA tests, which demands time and increases cost. Bone turnover markers need to be measured more easily for general use. Lateral flow-based immunoassay would be an appropriate method for this context. This study was performed to investigate the precision of a newly developed lateral flow-based immunoassay for measuring the urinary NTx and serum CTx, and their correlations with ELISA measurements. Urine NTx and serum CTx concentrations were determined by photoscan of newly developed strips, using a lateral flow-based immunoassay for 36 subjects (mean age 66.2 years, SD 7.5 years; four males and 32 females). Repeated measurement of urinary NTx and serum CTx were performed three times, using this technology for a precision test. The correlation of the lateral flow-based immunoassay with the ELISA measurements was analyzed. Precision of the newly developed lateral flow based immunoassay was 0.974 (ICC, 95% confidence interval, 0.955 to 0.986) and 0.995 (ICC, 95% confidence interval, 0.991 to 0.997) for urinary NTx and serum CTx, respectively. The correlation of lateral flow based immunoassay with ELISA was 0.913 for urinary NTx and 0.872 for serum CTx. These results suggest that measuring the urinary NTx and serum CTx, using a lateral flow-based immunoassay, is a relevant method for point-of-care testing and screening of bone resorption markers.
Mammalian Ste20-Like Kinase and SAV1 Promote 3T3-L1 Adipocyte Differentiation by Activation of PPARγ
Byoung Hee Park, Dae Soon Kim, Gun Woo Won, Hyun Jeong Jeon, Byung-Chul Oh, YoungJoo Lee, Eung-Gook Kim, Yong Hee Lee
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0030983
Abstract: The mammalian ste20 kinase (MST) signaling pathway plays an important role in the regulation of apoptosis and cell cycle control. We sought to understand the role of MST2 kinase and Salvador homolog 1 (SAV1), a scaffolding protein that functions in the MST pathway, in adipocyte differentiation. MST2 and MST1 stimulated the binding of SAV1 to peroxisome proliferator-activated receptor γ (PPARγ), a transcription factor that plays a key role in adipogenesis. The interaction of endogenous SAV1 and PPARγ was detected in differentiating 3T3-L1 adipocytes. This binding required the kinase activity of MST2 and was mediated by the WW domains of SAV1 and the PPYY motif of PPARγ. Overexpression of MST2 and SAV1 increased PPARγ levels by stabilizing the protein, and the knockdown of SAV1 resulted in a decrease of endogenous PPARγ protein in 3T3-L1 adipocytes. During the differentiation of 3T3-L1 cells into adipocytes, MST2 and SAV1 expression began to increase at 2 days when PPARγ expression also begins to increase. MST2 and SAV1 significantly increased PPARγ transactivation, and SAV1 was shown to be required for the activation of PPARγ by rosiglitazone. Finally, differentiation of 3T3-L1 cells was augmented by MST2 and SAV1 expression and inhibited by knockdown of MST1/2 or SAV1. These results suggest that PPARγ activation by the MST signaling pathway may be a novel regulatory mechanism of adipogenesis.
A Practical Protection Coordination Strategy Applied to Secondary and Facility Microgrids
Dae-Geun Jin,Jong-Chan Choi,Dong-Jun Won,Hak-Ju Lee,Woo-Kyu Chae,Jung-Sung Park
Energies , 2012, DOI: 10.3390/en5093248
Abstract: In a conventional distribution system, protection algorithms are designed to operate on a unidirectional high fault-current level. In a microgrid, a fault current from distributed generation (DG) may bring about a relay malfunction because of the bidirectional and relatively small fault current. Therefore, the conventional protection scheme is not applicable to microgrids and a new protection method must be developed. In this paper, two protection coordination algorithms which can be applied for facility and secondary microgrids are proposed, respectively. The proposed protection algorithms eliminate faults not by the EMS signal but by directional relays. Moreover, this makes the algorithms flexible regardless of the types and numbers of DG. The proposed protection algorithms were simulated at the KEPCO RI Microgrid Demonstration Site.
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