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RISS 활용도 분석
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일본/중국/유럽자료
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최신/인기 학술자료
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해외논문구매대행(E-DDS)
http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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RISS 인기검색어
- 검색키워드
- 저자 : Seung-Hwan (검색결과 12,835 건)
- 무료
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Seung-Chang,Kim,Seung-Hwan,Lee,Han-Ha,Chai,Ui-Hyung,Kim,Ki-Yong,Chung,Sun-Sik,Jang,Bong-Hwan,Choi 충남대학교 농업과학연구소 2019 Korean Journal of Agricultural Science Vol.46 No.3
Due to the ban on the use of antibiotics, interest has been increasing for the development of therapeutic agents to treat various diseases using natural resources. Osthole, a natural coumarin compound used in traditional Chinese medicines, exerts an anti-inflammatory effect, but its effects in cows remain unknown. In this study, the effect of osthole on lipopolysaccharide (LPS)- or concanavalin-A (Con-A)- stimulated peripheral blood mononuclear cells (PBMCs) was assessed. Jugular venous blood was collected from Korean calves, and PBMCs were isolated. They were then used to study the immune response of PBMCs to treatment with osthole and LPS or Con-A for 72 h by measuring inflammatory cytokines including tumor necrosis factor-α (TNF-α) and interferon-γ (IFN-γ). Osthole significantly inhibited the mRNA secretion of TNF-α and IFN-γ in a dose-dependent manner. Therefore, osthole inhibited LPS- or Con-A- induced TNF-α and Con-A-induced IFN-γ production significantly in dose-dependent manner. These results clearly suggest that osthole inhibited the LPS- or Con-A- stimulated upregulation of pro-inflammatory cytokines in a dosedependent manner, without causing obvious cytotoxic effects. Osthole could also protect cows from LPS- or Con-A- induced endotoxin shock, possibly by inhibiting the production of pro-inflammatory cytokines, which suggests that osthole might be a novel therapeutic agent for the prevention of inflammatory diseases.
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Seung,Hwan,Song,Chong,Hoon,Kim,Duk,Hwan,Moon,Sungsoo,Lee 대한흉부외과학회 2020 The Korean Journal of Thoracic and Cardiovascular Vol.53 No.5
Background: Radiographic modalities have been commonly used to evaluate pectus carinatum (PC), and compressive orthotic bracing is the most widely accepted treatment method. The aim of this study was to determine the efficacy of 3-dimensional (3D) body surface scanning as an alternative modality for the evaluation of PC. Methods: The medical records of 63 patients with PC who were treated with compressive orthotic bracing therapy between July 2017 and February 2019 were retrospectively analyzed. Using both 2-view chest radiography (posteroanterior and lateral view) and 3D body scanning, the height of maximal protrusion of the chest wall was measured both before and after 2 weeks of bracing therapy. The difference between the pre- and post-treatment measurements was calculated for both modalities, and these differences were compared and analyzed. Results: Based on the comparison between the pre- and post-treatment radiographs, bracing therapy produced favorable outcomes in all patients (p<0.001). The measurements obtained via 3D scanning were strongly correlated with those obtained via chest radiography (r=0.60). Conclusion: Based on the findings of this study, 3D body surface scanning appears to be an effective, radiation-free, and simple method for the post-treatment follow-up evaluation of PC, and thus can be considered an alternative to radiography.
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Mitigation of Co-channel Interference in FHSS-based Cognitive Radio Systems
Seung-Hwan,Lee,Jin-Seok,Han,Yong-Hwan,Lee 에스케이텔레콤 (주) 2010 Telecommunications Review Vol.20 No.5
In this paper, we consider the mitigation of Frequency dynamic and/or Static (FS) co-channel interference in frequency hopping spread spectrum-based cognitive radio systems (e.g., Bluetooth). Prior to sending packets, the proposed scheme first checks whether the next channel for the frequency hopping is in use by other signals or not with detection parameters determined by considering the trade-off between carrier sensing performance and throughput. It periodically classifies busy channels subject to FS interference based on the packet error rate and interference signal detection rate in a group-wise manner and changes the set of hopping frequency. The analytic design and simulation results show that when applied to the Bluetooth system, the proposed scheme is quite robust to the presence of multiple WLAN and other Bluetooth signals, compared to the adaptive frequency hopping specified in IEEE 802.15.1 Bluetooth
