• Journal of KIISE:Databases
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• v.31 no.3
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• pp.320-330
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• 2004

Query languages for XML use paths in a data graph to represent queries. Actually, paths in a data graph are used as a basic constructor of an XML query. User can write more expressive Queries by using Patterns (e.g. regular expressions) for paths. There are many identical paths in a data graph because of the feature of semi-structured data. Current researches for indexing XML utilize identical paths in a data graph, but such an index can grow larger than source data graph and cannot guarantee efficient access path. In this paper we propose a partitioning technique that can partition all the paths in a data graph. We develop an index graph that can find appropriate partitions for a path query efficiently. The size of our index graph can be adjusted regardless of the source data. So, we can significantly improve the cost for index graph traversals. In the performance study, we show our index much faster than other graph based indexes.

• Journal of Korean Society of Environmental Engineers
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• v.39 no.4
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• pp.194-200
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• 2017

On-site Algae Collecting System (OACS) is one of urgent countermeasures to clean the raw water when the algae blooms severely. Rapid reaction capability, high efficiency and large capacity are required when applying OACS to large water areas. The total performance of OACS are always determined by unit process named Flotation, Trapping and Collection. The working efficiency and daily treatment quantity of OACS can be increased when it runs automatically. As the rapid development of OACS technology, in the first place, equipment are miniaturized and simple. And in the second place, automation process from Trapping to Collection are advanced. So, They produce results higher working efficiency, smaller residual sludge on treated water, system's advanced environmental friendly features and the increased amount of sludge by Collection process to achieve large capacity. Now OACS has overcome the algae multiplication rate to ensured the amount of removal algae. In another aspect, it is high economically feasible because of reducing operation cost against the large capacity.

• The Journal of Korean Orthopaedic Ultrasound Society
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• v.4 no.1
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• pp.1-6
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• 2011

Purpose: To evaluate the usefulness of ultrasonography in diagnosis of the medial meniscus tear as a screening tool before performing magnetic resonance imaging. Materials and Methods: From April 2009 to September 2010, magnetic resonance imaging (MRI) was taken in 147 knees out of 341 knees examined with ultrasonography (US) under the suspicion of medial meniscus tear. The sonographic findings were 16 without abnormality, 12 inhomogeneity, 4 cluster, 60 cleavage and 55 more than 5mm medial extrusion of medial meniscus. In Statistical analysis, sensitivity and specificity, positive predictive value and negative predictive values were calculated. Results: The MRI showed abnormality in 104 knees. Sensitivity and specificity of ultrasonography for MRI was 94.2% and 23.3%, respectively. Positive predictive value was 74.8%, negative predictive value was 62.5%. The positive predictive value of ultrasonography were 58.3% in heterogeneity, 100% in showing cluster, 75% in visible cleft and 80% in medial extrusion. Conclusion: The US is a useful tool in prediction of medial meniscus tear before confirming it in high-cost MRI.

• Clinics in Shoulder and Elbow
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• v.10 no.2
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• pp.199-203
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• 2007

Purpose: It is very important to evaluate and fix coronoid process fractures because they are a critical element for a stable, effective elbow function. The lateral view of the elbow joint is used for a radiographic evaluation of the coronoid but an understanding of the fracture pattern is often difficult because of overlap of the radial head and obliquity of the fracture line. We developed the coronoid view, which is a new radiograph for an evaluation of the coronoid process fracture, and discuss its advantages for a postoperative follow-up. Materials and Methods: The coronoid view was designed for an evaluation of the anteromedial fragment of the coronoid process. After the patient sat on his side, the shoulder was abducted $45^{\circ}$ and the elbow was flexed $90^{\circ}$. The X-ray beam was shot perpendicular to the table. Since shoulder was abducted $45^{\circ}$ the fracture line of the coronoid process can be parallel to the X-ray beam, and the radial head can be cleared. Conclusion: The coronoid view can be a good alternative radiograph for an evaluation of a coronoid process fracture because the beam is parallel to the fracture line. The coronoid view can be particularly useful in postoperative patient follow-up where computed tomography is impractical due to metal implants and cost.

• Korean Journal of Food Science and Technology
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• v.27 no.3
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• pp.281-285
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• 1995

The persimmon leaf tea was produced from persimmon leaves by three different methods (conventional, steamed, fermented) and the changes of total vitamin C and superoxide dismutase(SOD)-like activity were investigated. The amount of total vitamin C was the highest in fermented persimmon leaf tea which was 47% of total vitamin C of raw persimmon leaves. The SOD-like activity of conventional and fermented persimmon leaf teas were a little higher than that of steamed. The total vitamin C of steamed persimmon leaf tea was decreased slowly as the extraction time was increased. That of fermented persimmon leaf tea was increased generally at $60^{\circ}C\;and\;70^{\circ}C$, and increased until 5min and then decreased at $80^{\circ}C\;and\;90^{\circ}C$, The optimum extraction condition of total vitamin C in fermented persimmon leaf tea was 3min and 5min at $80^{\circ}C\;and\;90^{\circ}C$, 5min and 10min at $60^{\circ}C$. The total vitamin C of conventional persimmon leaf tea was so little that could not be measured by DNP method. The SOD-like activity of conventional and steamed persimmon leaf teas were increased and that of fermented showed the trend of increasing-decreasing-increasing. Fermented persimmon leaf tea had higher SOD-like activity than conventional and steamed at all tested conditions, and the optimum extraction condition of SOD-like activity was 3min and 10min at $80^{\circ}C\;and\;90^{\circ}C$.