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리트벨트법을 이용한 당류계 초지연성 혼화제 혼입 시멘트 페이스트의 수화생성물 정량 분석
현승용 ( Hyun¸ Seung-yong ),후윈야오 ( Hu¸ Yun-yao ),김수호 ( Kim¸ Su-hoo ),김종 ( Kim¸ Jong ),한민철 ( Han¸ Min-cheol ),한천구 ( Han¸ Cheon-goo ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
This study attempted to study the setting time and compressive strength according to the sugar type through XRD. Setting time was found to be delayed the most when mixing white sugar, and setting time was promoted when mixing Saccharin and Aspartame. It was found that when white sugar and Grosvener siraitia were mixed, the compressive strength was higher than that of Control. Aspartame the age passed, C<sub>3</sub>S decreased and Ca(OH)<sub>2</sub> increased.
SeungYong Choi,Shivshankar Chaudhari,HyeonTae Shin,조계용,이동욱,MinYoung Shon,남승은,박유인 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
In reference, the mussel-encouraged surface adhesion chemistry, dopamine oxidative autopolymerizationon the surface of halloysite nanotubes (HNTs) was performed to confer hydrophilicityto the HNTs. The additional hydrophilic moieties with surface coating by polydopamine (PDA) wasassured with transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and X-ray photoelectronspectroscopy (XPS) techniques. A PDA/HNT-incorporated polyvinyl alcohol/polyvinyl amine(PVA-PVAm) membrane was fabricated for the pervaporation-dehydration of isopropanol/water (IPA/water),and the filler dispersion, crystallinity, and hydrophilicity of the membrane were confirmed by fieldemissionscanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and contact angle measurements,respectively. The pervaporation test was performed with membranes having different PDA/HNTcontents, where the flux increased from 0.19 to 0.39 kg/m2h, and the separation factor decreased from479 to 63 with the 80/20 (w/w, IPA/water) feed mixture at 40 C. Compared to the unmodified HNTincorporatedmembrane, the membrane with 5 wt.% PDA/HNT exhibited superior performance. Uponincreasing the feed (85/15 IPA/water w/w) temperature from 40 to 70 C, the flux of water and IPAincreased from 0.062 to 0.13 kg/m2h and 0.000063 to 0.00144 kg/m2h, respectively. The apparent energyof activation calculated using the Arrhenius equation was positive for both IPA and water. The higherenergy required for permeation of IPA (99.65 kJ/mol) compared to water (22.69 kJ/mol) is attributed tofacile permeation of water compared to IPA through the hydrophilic channel created by PDA-HNT. Inlong-term operation (120 h), the IPA and water flux of the 5 wt.% PDA/HNT-incorporated PVA-PVAmmembrane was maintained using a feed composition of 80/20 (w/w %) IPA/water at 40 C, indicatingremarkable reusability of the membrane.
Simulation of Excitation and Propagation of Pico-Second Ultrasound
Seungyong Yang,Nohyu Kim 한국비파괴검사학회 2014 한국비파괴검사학회지 Vol.34 No.6
This paper presents an analytic and numerical simulation of the generation and propagation of pico-second ultrasound with nano-scale wavelength, enabling the production of bulk waves in thin films. An analytic model of laser-matter interaction and elasto-dynamic wave propagation is introduced to calculate the elastic strain pulse in microstructures. The model includes the laser-pulse absorption on the material surface, heat transfer from a photon to the elastic energy of a phonon, and acoustic wave propagation to formulate the governing equations of ultra-short ultrasound. The excitation and propagation of acoustic pulses produced by ultra-short laser pulses are numerically simulated for an aluminum substrate using the finite-difference method and compared with the analytical solution. Furthermore, Fourier analysis was performed to investigate the frequency spectrum of the simulated elastic wave pulse. It is concluded that a pico-second bulk wave with a very high frequency of up to hundreds of gigahertz is successfully generated in metals using a 100-fs laser pulse and that it can be propagated in the direction of thickness for thickness less than 100 ㎚.
Paraticism of natural parasitoids of Phyllocnistis citrella in citrus orchards in Jeju, Korea
Seungyong Hyun,Subin Kim,Dong-soon Kim 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04
본 연구는 감귤의 해충인 귤굴나방의 기생성 천적의 종류와 기생률을 조사하기 위하여 수행하였다. 2013~2014 제주 감귤원에서 발견된 귤굴나방 기생봉 천적은 좀벌상과에 속한 총 7종이 발견되었다. 그 중 좀벌과에 속한 Sympiesis striatipes가 73%, Quadrastichus sp.가 22%로 대부분을 점유하였다. 나머지 종은 Neochrysocharis sp., Ageniaspis sp., Pnigalio sp., Holcopelte sp., Trichomalopsis sp.(Pteromalidae) 등이었다. 천적의 평균 기생률은 관행재배에서 10.7%, 무농약 과원에서는 32.2%를 나타냈다.
AN INTEGRATED FRAMEWORK FOR DATA QUALITY MANAGEMENT OF TRAFFIC DATA WAREHOUSES
Seungyong Park,Segil Jeon,Seong Namkoong,Yunmook Nah 한국멀티미디어학회 2007 한국멀티미디어학회 국제학술대회 Vol.2007 No.-
In this paper, we propose an integrated framework for managing data quality in traffic data warehousing environments. We describe how to collect and construct the traffic data warehouses from the operational databases. We explain how to configure the traffic data warehouses efficiently. Also, we propose a quality management framework to provide high quality traffic data for various analytical transactions. The proposed integrated framework can contribute in providing high quality traffic data to the traffic related analytical applications.
Seungyong Shin,Byungjoo Park 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.9
The advantage of proxy mobility management protocol over IPv6 is that it efficiently manages the latency time caused by a handover as the router on the access network takes the role of the mobility management of a mobile device instead. However, the frequent occurrences of handovers on the nested access network causes the increase of load on the MAG, which then brings about the loss of packets and delay of the handover process. Although fast proxy mobility management protocol has been suggested to resolve this problem, various implementations of the beacon or router advertisement on the wireless network and continuous research are required to provide stable multimedia traffic services. The proposed advanced cross-layering algorithm (ACL) builds a bi- directional tunnel between MAGs, based on the mobility prediction between the access routers on the nested network, using the reverse binding mechanism to optimize the route of the packets and therefore increase the efficiency of packet forwarding.