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박상준,이종찬,Park Sangjoon,Lee Jongchan 한국시뮬레이션학회 2005 한국시뮬레이션학회 논문지 Vol.14 No.1
Service Level Agreement (SLA) is a service providing scheme by a service class agreement between a user and a service provider SLA allows that a user can select an expected service class in various service classes provided from a service provider. Recently, SLA management is adapted to support the end-to-end Qos for service users in Beyond 3 Generation (B3G) networks. In B3G networks, SLA provides multiple service classes on access networks so that service classes should be managed to assure the service satisfaction for users. In this paper, we propose a dynamic Qos management scheme by IP traffic class controlling based on SLA in B3G networks. Also, to manage dynamic traffic service, we consider Differentiated services (Diffserv) mechanism for the resource management by SLA. An If service traffic class on SLA can be dynamically changed by Diffserv traffic management to support dynamic end-to-end Qos. Hence, in this paper, we consider the buffer threshold scheme for controlling traffic loads and the traffic level control scheme for implementing the dynamic traffic management by the SLA.
Glycothermal법에 의한 ZnS 분말 합성 및 광촉매 특성
박상준,임대영,송정환,Park, Sang-Jun,Lim, Dae-Young,Song, Jeong-Hwan 한국재료학회 2017 한국재료학회지 Vol.27 No.9
ZnS powder was synthesized using a relatively facile and convenient glycothermal method at various reaction temperatures. ZnS was successfully synthesized at temperatures as low as $125^{\circ}C$ using zinc acetate and thiourea as raw materials, and diethylene glycol as the solvent. No mineralizers or precipitation processes were used in the fabrication, which suggests that the spherical ZnS powders were directly prepared in the glycothermal method. The phase composition, morphology, and optical properties of the prepared ZnS powders were characterized using XRD, FE-SEM, and UV-vis measurements. The prepared ZnS powders had a zinc blende structure and showed average primary particles with diameters of approximately 20~30 nm, calculated from the XRD peak width. All of the powders consisted of aggregated secondary powders with spherical morphology and a size of approximately $0.1{\sim}0.5{\mu}m$; these powders contained many small primary nanopowders. The as-prepared ZnS exhibited strong photo absorption in the UV region, and a red-shift in the optical absorption spectra due to the improvement in powder size and crystallinity with increasing reaction temperature. The effects of the reaction temperature on the photocatalytic properties of the ZnS powders were investigated. The photocatalytic properties of the as-synthesized ZnS powders were evaluated according to the removal degree of methyl orange (MO) under UV irradiation (${\lambda}=365nm$). It was found that the ZnS powder prepared at above $175^{\circ}C$ exhibited the highest photocatalytic degradation, with nearly 95 % of MO decomposed through the mediation of photo-generated hydroxyl radicals after irradiation for 60 min. These results suggest that the ZnS powders could potentially be applicable as photocatalysts for the efficient degradation of organic pollutants.
박상준,이민정,성미선,김남주,정호경,곽상인,Sang Jun Park,Min Joung Lee,Mi Sun Sung,Nam Ju Kim,Ho-Kyung Choung,Sang In Khwarg 대한안과학회 2008 대한안과학회지 Vol.49 No.10
Purpose: To report a rare case of conjunctival myxoma. Case summary: A 40-year-old man presented with a nasal bulbar conjunctival mass in his left eye. The mass was a 12 mm×7 mm pinkish movable mass in the subconjunctival space. There was no pain and no tenderness. We diagnosed the case as lymphoma, and we performed excisional biopsy of the mass. Histopathologic examination revealed the tumor to be a myxoma. Conclusions: When a patient presents with a pinkish, less vessel-appearing, non-pigmented and movable mass of the conjunctiva, conjunctival myxoma should be considered as a possible diagnosis. J Korean Ophthalmol Soc 2008;49(10):1676-1679