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제로에너지건물 구현을 위한 단열 파스너의 열 특성 및 실증에 관한 연구
강재식(Jae-Sik Kang),이호열(Ho-yeol Lee),최경석(Gyeong-Seok Choi),최현중(Hyun-Jung Choi) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Internal insulation systems are applied to the most buildings in Korea. However, due to the importance of building energy enhanced the interest of the external insulation systems. The external insulation systems have better thermal performance because the heat bridges through the structure are rarely formed. But heat bridges through the connectors and anchors between structure and external insulation decrease heat performance of the envelope system. In this paper, mock-up test and simulation was conducted. Heat Bridge-free Fastener was installed between two chambers of which indoor temperature was controlled. Heat Bridge-free Fastener reduced heat flow through the fastener.
수평․수직연소 시험법에 의한 EPS 단열재의 연소성능 특성
이호열(Ho-yeol Lee),강재식(Jae-Sik Kang),최현중(Hyun-Jung Choi) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Organic thermal insulation such as cellular polystyrene insulation is mainly used in buildings. Organic thermal insulation is a highly flammable petrochemical material. Because of such characteristics, organic thermal insulation caused fire accident for buildings. The inflammability of cellular polystyrene insulation specified by Korea standard KS M 3808:2011, "Cellular polystyrene(PS) insulation": combustion time ≤ 120 seconds, combustion length ≤ 60 ㎜ through Korea standard KS M ISO 9772:2013, "Cellular plastics - Determination of horizontal burning characteristics of small specimens subjected to a small flame". In this study, horizontal and vertical burning test (KS M ISO 9772 and UL 94 V, respectively) were analyzed about many cellular polystyrene insulations. As a results, horizontal burning test is very little differentiation the flame-retardant performance levels. However, vertical burning test is not like that. To better assess the level of the flame-retardant performance, the current standard needs to be improved.
DDoS공격 탐지에 효율적인 트래픽 비율 분석법(ETAM)
최광열 ( Kwangyeol Choi ),최현상 ( Hyunsang Choi ),이희조 ( Heejo Lee ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.2
DDoS 공격은 인터넷 환경에서 네트워크나 개인 호스트를 위협하는 대표적인 공격 트래픽이다. DDoS 공격은 간단한 Tool 로 공격이 가능하면서 네트워크 기반 구조에 큰 피해를 입힐 수 있기 때문에 그 심각성이 크다. DDoS 공격의 효과적인 방어와 대응을 위해서는 DDoS 공격 트래픽에 대한 정확한 분석과 탐지가 선행되어야 한다. 본 논문에서는 DDoS 공격 징후를 신속하게 탐지해 낼 수 있는 효율적인 트래픽 비율 분석법(ETAM)을 제안하고, ETAM 기법을 통해 공격을 빠르고 신속하게 탐지할 수 있음을 보인다.
최현실,민병호,정경열 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Upconversion phosphors can emit visible light under the excitation of near-infrared light, and they are attractive materials for applications in bio-imaging, security ink, 3D display, and solar cell. The upconversion intensity is mainly affected by the host materials. Thus, many efforts have been dedicated to seek a proper host materials and a synthetic method in order to achieve high upconversion as well as preparing nano-sized particles. CeO<sub>2</sub> host has several advantages such as good chemical stability and low phonon frequency. In this work, Ho<sup>3+</sup>/Yb<sup>3+</sup>- codoped CeO<sub>2</sub> nanoparticles were synthesized by spray pyrolysis. The resulting particles showed intensive green emission. The concentrations of activators were optimized in terms of achieving the highestluminescence. Also, the emission intensity was further improved by introducing monovalent metal ions for the charge compensation between Ce<sup>4+</sup> and Ho<sup>3+</sup>/Yb<sup>3+</sup>.