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Survey of scrub typhus vectors at epidemic regions in Jeollabuk-Do, Korea 2016
Won Il Park,Jong Yul Roh,Bong Gu Song,Seong Yun Kim,Hyung-Woo Lim,Hak Seon Lee,Wook-Gyo Lee,Kyu-sik Chang,Young Ran Ju,E-hyun Shin 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.10
A surveillance of chigger mites was performed to monitor the incidence of scrub typhus vectors at 5 environmental collection points of 3 locations (Muju, Namwon and Gimge) from April 2016 in Jeollabuk-Do, Korea. During the surveillance period, 3,292 chigger mites were collected and the predominant species were Leptotrombidium pallidum (42.9%). The high environmental collecting rates were recorded at reservoir bank (31.6%) and grassfield (29.7%). We detected Orientia tsutsugamushi from the samples collected in Jeollabuk-Do using nested polymerase chain reaction. The specific DNA of O. tsutsugamushi were detected in 11 pools among total 119 pools and its minimum positive rate was 0.35%. In order to clarify the relationship between chigger mites and scrub typhus cases, further survey will be needed.
Study of a “wing-type” implant on stress distribution and bone resorption at the alveolar crest
Jong-Wook Park,Sin-Guen Kim,Dong-Won Choi,Mi-Ra Choi,Youn-Jin Yoon,Jun-Woo Park,Dong-Ju Choi 대한구강악안면외과학회 2012 대한구강악안면외과학회지 Vol.38 No.6
Objectives: Implants connect the internal body to its external structure, and is mainly supported by alveolar bone. Stable osseointegration is therefore required when implants are inserted into bone to retain structural integrity. In this paper, we present an implant with a “wing” design on its area. This type of implant improved stress distribution patterns and promoted changes in bone remodeling. Materials and Methods: Finite element analysis was performed on two types of implants. One implant was designed to have wings on its cervical area, and the other was a general root form type. On each implant, tensile and compressive forces (30 N/m 2 , 35 N/m 2 , 40 N/m 2 , and 45 N/m 2 ) were loaded in the vertical direction. Stress distribution and displacement were subsequently measured. Results: The maximum stresses measured for the compressive forces of the wing-type implant were 21.5979 N/m 2 , 25.1974 N/m 2 , 29.7971 N/m 2 , and 32.3967 N/m 2 when 30 N/m 2 , 35 N/m 2 , 40 N/m 2 , and 45 N/m 2 were loaded, respectively. The maximum stresses measured for the root form type were 23.0442 N/m 2 , 26.9950 N/m 2 , 30.7257 N/m 2 , and 34.5584 N/m 2 when 30 N/m 2 , 35 N/m 2 , 40 N/m 2 , and 45 N/m 2 were loaded, respectively. Thus, the maximum stresses measured for the tensile force of the root form implant were significantly higher (about three times greater) than the wing-type implant. The displacement of each implant showed no significant difference. Modifying the design of cervical implants improves the strength of bone structure surrounding these implants. In this study, we used the wing-type cervical design to reduce both compressive and tensile distribution forces loaded onto the surrounding structures. In future studies, we will optimize implant length and placement to improve results. Conclusion: 1. Changing the cervical design of implants improves stress distribution to the surrounding bone. 2. The wing-type implant yielded better results, in terms of stress distribution, than the former root-type implant.