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An Efficient On-Demand Routing Approach with Directional Flooding for Wireless Mesh Networks
Kum, Dong-Won,Le, Anh-Ngoc,Cho, You-Ze,Toh, Chai Keong,Lee, In-Soo The Korea Institute of Information and Commucation 2010 Journal of communications and networks Vol.12 No.1
Current on-demand ad-hoc routing protocols are not appropriate for wireless mesh networks (WMNs), because flooding-based route discovery is both redundant and expensive in terms of control message overhead. In this paper, we propose an efficient on-demand routing approach with directional flooding (DF), which is suitable for the WMNs with limited mobility. In the route discovery process to reach a gateway, our DF scheme can reduce the number of route request (RREQ) packets broadcast by using a restricted directional flooding technique. Simulation results show that ad hoc on-demand distance vector (AODV) with DF (AODV-DF) can significantly reduce routing overhead by RREQ packets and enhance overall performance compared with the original AODV.
An Efficient On-Demand Routing Approach with Directional Flooding forWireless Mesh Networks
Dong-Won Kum,Anh-Ngoc Le,조유제,Chai Keong Toh,In-Soo Lee 한국통신학회 2010 Journal of communications and networks Vol.12 No.1
Current on-demand ad-hoc routing protocols are not appropriate for wireless mesh networks (WMNs), because floodingbased route discovery is both redundant and expensive in terms of controlmessage overhead. In this paper, we propose an efficient ondemand routing approach with directional flooding (DF), which is suitable for the WMNs with limitedmobility. In the route discovery process to reach a gateway, our DF scheme can reduce the number of route request (RREQ) packets broadcast by using a restricted directional flooding technique. Simulation results show that ad hoc on-demand distance vector (AODV) with DF (AODV-DF) can significantly reduce routing overhead by RREQ packets and enhance overall performance compared with the original AODV.
( Dong-min Kum ),( Won-seob Shin ) 물리치료재활과학회 2017 Physical therapy rehabilitation science Vol.6 No.3
Objective: The purpose of this study was to investigate the effects of backward treadmill gait training between underwater and ground environments on strength, proprioception, and walking ability in persons with stroke. Design: Randomized control trial. Methods: Twenty eight subjects participated in the study in which they were randomly assigned to either the underwater backward treadmill training (UBTT) group (n=13) or the BTT group (n=15). In both groups, forward gait training was performed for 20 minutes on the ground treadmill. The UBTT group performed backward gait on an underwater treadmill for 20 minutes while the BTT group performed backward gait on a ground treadmill for 20 minutes. The gait training in each group was performed twice a week for a total of six weeks. Muscle strength, proprioception, and gait ability was assessed using a digital power meter, joint angle recurrence method using the smartphone protractor application, the Figure-of-Eight walk test (F8W) and the functional gait assessment (FGA) respectively. Results: Both groups showed significant improvement in strength, F8W and FGA scores after training (p<0.05). However, there was no statistically significant difference between the two groups. Both groups showed significant improvement in proprioception after training (p<0.05). In the comparison between the two groups, there was a greater significant change in the UBTT group for joint proprioception (p<0.05). Conclusions: In this study, it was found that both backward treadmill gait training programs were effective on strength, proprioception, and gait ability, and that underwater training was particularly effective on proprioception compared to ground training.
( Dong Kum Park ),( Seon Hye Son ),( Su Kim ),( Woo Moon Lee ),( Hee Ju Lee ),( Hak Soon Choi ),( Eun Young Yang ),( Won Byoung Chae ),( Ho Cheol Ko ),( Yun Chan Huh ) 한국육종학회 2013 Plant Breeding and Biotechnology Vol.1 No.3
A panel of 65 melon germplasm was used to screen for resistance to Fusarium oxysporum f. sp. melonis (Fom) and Monosporascus cannonballus. The screening test revealed 35 accessions that are highly resistant to Fom race 1 and 11 accessions with high resistance to M. cannonballus. A total of four accessions, ‘K134068’, ‘K133069’, ‘Wondae’ and ‘PI 414723’, showing resistance to both pathogens were selected as candidates for melon rootstock. Yield and quality of fruits harvested from ‘Earl``s elite’ (Muskmelon, Reticulatus Group) grafted onto the selected melon rootstocks were found comparable to or better than those of non-grafted melons. Nearly negligible incidence of fruit fermentation was observed when ‘Homerunstar’ (Honeydew type, Inodorus Group) was grafted with the selected melon rootstocks, unlike when it was grafted onto ’Shintozwa’ (Cucurbita spp.) rootstock. The selected melon accessions with resistance to Fusarium wilt and Monosporascus root rot are considered to be potential and valuable genetic resources for breeding program of melon.
Kum, Dong-Min,Shin, Won-Seob korean Academy of Physical Therapy Rehabilitation 2017 Physical therapy rehabilitation science Vol.6 No.3
Objective: The purpose of this study was to investigate the effects of backward treadmill gait training between underwater and ground environments on strength, proprioception, and walking ability in persons with stroke. Design: Randomized control trial. Methods: Twenty eight subjects participated in the study in which they were randomly assigned to either the underwater backward treadmill training (UBTT) group (n=13) or the BTT group (n=15). In both groups, forward gait training was performed for 20 minutes on the ground treadmill. The UBTT group performed backward gait on an underwater treadmill for 20 minutes while the BTT group performed backward gait on a ground treadmill for 20 minutes. The gait training in each group was performed twice a week for a total of six weeks. Muscle strength, proprioception, and gait ability was assessed using a digital power meter, joint angle recurrence method using the smartphone protractor application, the Figure-of-Eight walk test (F8W) and the functional gait assessment (FGA) respectively. Results: Both groups showed significant improvement in strength, F8W and FGA scores after training (p<0.05). However, there was no statistically significant difference between the two groups. Both groups showed significant improvement in proprioception after training (p<0.05). In the comparison between the two groups, there was a greater significant change in the UBTT group for joint proprioception (p<0.05). Conclusions: In this study, it was found that both backward treadmill gait training programs were effective on strength, proprioception, and gait ability, and that underwater training was particularly effective on proprioception compared to ground training.
( Dong Min Cha ),( Kyeong Hwan Kim ),( Hyuk Jin Choi ),( Mee Kum Kim ),( Won Ryang Wee ) 대한안과학회 2012 Korean Journal of Ophthalmology Vol.26 No.6
Purpose: To compare the effect of using fibrin glue or 10-0 nylon sutures on the clinical outcome of patients undergoing pterygium excision and conjunctival autografting. Methods: We retrospectively reviewed the medical records of 52 eyes from 46 patients who underwent pterygium excision and conjunctival autografting and were followed up for more than 3 months. The operation duration, postoperative inflammation, complications, and recurrence rates were compared between groups of 20 patients (22 eyes) for whom fibrin glue was used (fibrin glue group) and 26 patients (30 eyes) for whom suturing was performed with 10-0 nylon (suture group) in pterygium excision and conjunctival autografting. Results: The operation duration was 27.71 (5.22) minutes in the fibrin glue group and 43.30 (8.18) minutes in the suture group ( p = 0.000). Seven days after the operation, the fibrin glue group showed milder conjunctival inflammation than the suture group ( p = 0.000). Postoperative complications and corneal recurrence rates were not statistically different between the two groups. Conclusions: The use of fibrin glue in pterygium excision with conjunctival autografting is likely to be a more effective, safer procedure than suturing.
( Dong Hyun Jo ),( Joo Youn Oh ),( Mee Kum Kim ),( Jang Won Heo ),( Jin Hak Lee ),( Won Ryang Wee ) 대한안과학회 2010 Korean Journal of Ophthalmology Vol.24 No.3
A 68-year-old woman presented with pain in her left eye. Necrosis with calcium plaques was observed on the medial part of the sclera. Aspergillus fumigatus was isolated from the culture of the necrotic area. On systemic work-up including serum and urine electrophoresis studies, the serum monoclonal protein of immunoglobulin G was detected. The patient was diagnosed with monoclonal gammopathy of undetermined significance and fungal scleritis. Despite intensive treatment with topical and oral antifungal agents, scleral inflammation and ulceration progressed, and scleral perforation and endophthalmitis developed. Debridement, antifungal irrigation, and tectonic scleral grafting were performed. The patient underwent a combined pars plana vitrectomy with an intravitreal injection of an antifungal agent. However, scleral and intraocular inflammation progressed, and the eye was enucleated. Aspergillus fumigatus was isolated from the cultures of the eviscerated materials. Giemsa staining of the excised sclera showed numerous fungal hyphae.