• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1781-1783
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• 2005

To evaluate the grid-connected Photovoltaic(PV) system performance, as a medium size, a 120 kW PV system which was consisted of solar cells, PCS, 150kVA transformer station and utility grid was designed and constructed.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1784-1787
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• 2005

This paper presents the development and testing of a power conditioning system(PCS) for application to a 100kW Molten Carbonate Fuel Cell(MCFC) generation system. The MCFC generation system is a part of a four year government funded research project that began in 2001. This paper presents the results of various tests and performance verification of the 100kW PCS using a DC power system that simulates the DC output of the MCFC fuel cell. Performance of the DC/DC, DC/AC converters were verified, and basic control functions such as grid connection, protection and characteristics of each components were tested. The tests were performed under light load and rated load conditions to verify the operation efficiency, power quality effects, and stability of the PCS.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1788-1790
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• 2005

In this paper, an operating characteristics of a 50 kW gird-connected photovoltaic(PV) power system was analysed from 2000 to 2004. The construction of the PV system includes a 3-phase inverter for grid connection, PV module, distribution box, and data monitoring system. The major results of the demonstration test of the 50 kW class gird-connected PV system showed that efficiency of PV system was 11.13%, and the conversion efficiency of the inverter was 92% at a 50% load.

• Membrane Journal
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• v.4 no.2
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• pp.85-95
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• 1994

This papr studies the dynamic effects of polyelectrolyte in the multilayered membrane. It is found that electrophoretic convection in the fluid phase can be used to accelerate the speed of the polyelectrolyte. The model in the membrane separation is studied via interactions between fluid and solid phases. The spectra evaluation using the operator theoretic method is performed for the parametric studies of the physical properties in the membrane process. The findings of this paper shoould be useful in guiding the design of separation devices. This paper shows one example for macroscopic study the theoretical review paper of membrane transport.

• Parasites, Hosts and Diseases
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• v.36 no.1
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• pp.59-62
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• 1998

A human case of the tick bite on the back of 36-year-old man was found in September 1995. On admission he complained of itching sensation and pain at the site. The removed tick was identified morphologically as fxones nipponensis.

• Journal of the Korean Solar Energy Society
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• v.28 no.5
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• pp.72-77
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• 2008

The purpose of this paper is to explain the real characteristics of generation system of large scale power system of high voltage the grid connected PV power system for electricity industry. Main system is made up PCS in the class 150kVA. and we studied commercial operation in Korea-Western Power Company,(Tae-An headquarter) with the capacity of module is 122.5 $kW_p$. On the average, power plant utilities' utilization is 12.71 percent and consumption rate is 6.66 percent. We operated normally since 25th, August 2005 without any other problems.

• Journal of Veterinary Clinics
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• v.30 no.6
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• pp.499-502
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• 2013

An eight-year-old, castrated male, Poodle dog was presented with a bite wound in the neck region. Clinical examination revealed non-ambulatory signs of tetraparesis with deep pain, and upper motor neuron changes in all limbs. Fractures of the transverse process of C1 and the dorsal spinous process of C2 were observed on the radiographs and the computed tomography (CT). Conservative therapy was performed for 1 week. However the neurological problems were not alleviated until 7 days after injury. The owners agreed to perform surgical stabilization. The surgical stabilization was performed 7 days after presentation. Ventral stabilization was performed with screws, K-wires and bone cement. The dog stood up independently after 4 weeks and was able to walk 6 weeks postoperatively. In this report we suggest that using combined stabilization techniques are effective for this type of cervical fracture in which the dorsal and ventral structures of the vertebra are severely disrupted.

• Journal of Korean Society on Water Environment
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• v.37 no.5
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• pp.381-397
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• 2021

Off-flavor materials (geosmin and 2-methylisoborneol (2-MIB)) produced by microorganisms, such as, cyanobacteria and actinomycetes, cause freshwater use problems worldwide. Due to unpleasant taste and odor, these microorganisms have raised issues especially in drinking water resources. Recently, there has been increasing concern about 2-MIB and causal cyanobacteria, namely, Pseudanabaena, in Korea. However, material production and ecological dynamics remain largely unexplored. This study reviewed the distribution of Pseudanabaena, its species diversity, and the research trend of molecular ecology related to 2-MIB production in Korea. Based on published literature, we found that seven species of Pseudanabaena which include P. mucicola, P. limnetica, P. redekei, P. catenata, P. galeata, P. yagii, and P. cinerea appeared to occur in a variety of Korean water systems. All of these Pseudanabaena species were found in the North-Han River system (Lakes Soyang, Chuncheon, Uiam, and Paldang). Some of these species were also detected in other watersheds, but the precise species diversity was not identified. Species belonging to the Pseudanabaena genus are hard to classify through general microscopic alpha taxonomy, due to their very small cell size and similar morphological characters. Moreover, the potential of 2-MIB production cannot be detected by microscopic observation. Combining molecular ecological techniques, such as, environmental genomic materials (eDNA, eRNA) analyses to conventional methods could be useful to better understand the off-flavor material production and dynamics, thereby providing more efficient management strategies of freshwater systems.

• Journal of Trauma and Injury
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• v.18 no.2
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• pp.135-140
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• 2005

Backgrounds: Dog bite is the most common cause of animal bites. This study was conducted to analyze dog bite patients and to compare the differences of groups based on age. Methods: We performed a retrospective analysis of patients admitted to our hospital after dog bite injuries from January 2003 through December 2004. The patients were divided into two groups based on age; group A (children, < 15 years) and group B (adult, ${\geq}15years$). Results: A total of 103 patients were enrolled in the study. Dog bite injury frequently occurred to children under 10 years of age (21%). Home was the most common place of dog bite in group A, but public place was the most common in group B (p=0.000). Face was the most frequent body region of dog bite in group A, but hand was the most frequent in group B (p=0.039). Conclusions: From this study, we found statistically significant differences between the groups. Knowledge about age-related characteristics could result in improved prevention and treatment of these injuries.

• The Korean Journal of Emergency Medical Services
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• v.17 no.1
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• pp.63-78
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• 2013

Purpose : This study aimed to improve quality of prehospital emergency care for the insect bite patients by figuring out its current situations and problems. Methods : This study was conducted to 219 insect bite patients who were transferred to the hospital by 119 ambulance in D-City from July 1, 2009 to June 30, 2011. This study was a descriptive study by 119 run sheets. A total of 171 emergency medical technicians(EMTs) working in D-city and C-province completed the questionnaire. All of data were analyzed by SPSS 18.0. Results : Among the 219 patients, bee sting accounted for 62.6% and wasp sting accounted for 20.1%. Some patients complained of dizziness, headache, dyspnea, and disturbance of consciousness. The 119 EMTs initially treated the patients with oxygen supply to 57 patients (31.1%). Knowledge toward insect bite was statistically significant (p=.000) between advanced EMTs and basic EMTs. The obstacle to the prehospital care, many EMTs answered that the obstacle was due to the lack of 119 EMTs. Conclusion : It is necessary to differentiate the patients' symptoms and provide the better prehospital emergency care to verify the exact symptoms and signs.