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박재형,이용근,오성근 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.4
Silica@M (M = Ag, Au, Pd, Pt) particles were prepared by accumulating noble metal nanoparticles on the surface of thiolfunctionalized silica as a substrate, which was accomplished by the strong interaction between noble metal nanoparticles and thiol groups. In the conventional method, the fabrication of metal coated silica spheres by LBL (layer-by-layer) or core-shell synthesis is not efficient due to the complexity of the synthetic method, the low surface coverage of functional groups on the particles, and the low loading capacity of noble metal particles. The synthetic method in this study could overcome these limitations and make possible the simple preparation of the silica@M (M = Ag, Au, Pd, Pt) and hollow Pt metal particles with substantial metallic layers via a self-assembly behavior by a strong interaction between noble metal nanoparticles and thiol groups. Detailed characterizations of the silica@M (M = Ag, Au, Pd, Pt) and hollow Pt metal particles were performed to elucidate the surface and structural properties, the coordination of noble metals, and the crystalline structure of the noble metals on the surface by various analytical methods.
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Ganoderma Lucidum Pharmacopuncture for Teating Ethanol-induced Chronic Gastric Ulcers in Rats
박재형,장경준,김철홍,김정희,김영균,윤현민 대한약침학회 2015 Journal of pharmacopuncture Vol.18 No.1
Objectives: The stomach is a sensitive digestive organ that is susceptible to exogenous pathogens from the diet. In response to such pathogens, the stomach induces oxidative stress, which might be related to the development of both gastric organic disorders such as gastritis, gastric ulcers, and gastric cancer, and functional disorders such as functional dyspepsia. This study was accomplished to investigate the effect of Ganoderma lucidum pharmacopuncture (GLP) on chronic gastric ulcers in rats. Methods: The rats were divided into 4 groups of 8 animals each: the normal, the control, the normal saline (NP) and the GLP groups. In this study, the modified ethanol gastritis model was used. The rats were administrated 56% ethanol orally every other day. The dose of ethanol was 8 g/kg body weight. The normal group received the same amount of normal saline instead of ethanol. The NP and the GLP groups were treated with injection of saline and GLP respectively. The control group received no treatment. Two local acupoints CV12 (中脘) and ST36 (足三里) were used. All laboratory rats underwent treatment for 15 days. On last day, the rats were sacrificed and their stomachs were immediately excised. Results: Ulcers of the gastric mucosa appeared as elongated bands of hemorrhagic lesions parallel to the long axis of the stomach. In the NP and GLP groups, the injuries to the gastric mucosal injuries were not as severe as they were in the control group. Wound healings of the chronic gastric ulcers was promoted by using GLP and significant alterations of the indices in the gastric mucosa were observed. Such protection was demonstrated by gross appearance, histology and immunehistochemistry staining for Bcl-2-associated X (BAX), B-cell lymphoma 2 (Bcl-2) and Transforming growth factor-beta 1 (TGF-β1). Conclusion: These results suggest that GLP at CV12 and ST36 can provide significant protection to the gastric mucosa against an ethanol induced chronic gastric ulcer.
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Wireless monitoring of typhoon-induced variation of dynamic characteristics of a cable-stayed bridge
박재형,현탄칸,김정태 한국풍공학회 2015 Wind and Structures, An International Journal (WAS Vol.20 No.2
In this paper, wireless monitoring of typhoon-induced variation of dynamic characteristics of acable-stayed bridge is presented. Firstly, cable-stayed bridge with the wireless monitoring system isdescribed. Wireless vibration sensor nodes are utilized to measure accelerations from bridge deck and staycables. Also, modal analysis methods are selected to extract dynamic characteristics. Secondly, dynamicresponses of the cable-stayed bridge under the attack of two typhoons are analyzed by estimatingrelationships between wind velocity and dynamic characteristics. Wind-induced variations of deck and cablevibration responses are examined based on the field measurements under the two consecutive typhoons,Bolaven and Tembin. Finally, time-varying analyses are performed to investigate non-stationary randomproperties of the dynamic responses under the typhoons.
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Photocatalytic Performance of Graphene-TiO2 Hybrid Nanomaterials Under Visible Light
박재형 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.2
This study describes the development of graphene-TiO2 conjugates for the enhancement of the photocatalyticefficiency of TiO2. Graphene-based hybrid nanomaterials have attracted considerable attention because of the unique andadvantageous properties of graphene. In the proposed hybrid nanomaterial, graphene serves as an electron acceptor to ensurefast charge transfer. Effective charge separation can, therefore, be achieved to slow down electron-hole recombination. Thisresults in an enhancement of the photocatalytic activity of TiO2. In addition, increased adsorption and interactions withthe adsorbed reagents also lead to an improvement in the photocatalytic activity of graphene-TiO2 hybrid nanomaterials. The acquired result is encouraging in that the photocatalytic activity of TiO2 was initiated using visible light (630 nm)instead of the typical UV light.
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Vision-based technique for bolt-loosening detection in wind turbine tower
박재형,현탄칸,최상훈,김정태 한국풍공학회 2015 Wind and Structures, An International Journal (WAS Vol.21 No.6
In this study, a novel vision-based bolt-loosening monitoring technique is proposed for bolted joints connecting tubular steel segments of the wind turbine tower (WTT) structure. Firstly, a bolt-loosening detection algorithm based on image processing techniques is developed. The algorithm consists of five steps: image acquisition, segmentation of each nut, line detection of each nut, nut angle estimation, and bolt-loosening detection. Secondly, experimental tests are conducted on a lab-scale bolted joint model under various bolt-loosening scenarios. The bolted joint model, which is consisted of a ring flange and 32 sets of bolt and nut, is used for simulating the real bolted joint connecting steel tower segments in the WTT. Finally, the feasibility of the proposed vision-based technique is evaluated by bolt-loosening monitoring in the lab-scale bolted joint model.
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