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염기처리시간에 따른 지르코니아 현탁액의 분산성과 굴절율 변화
조충희,함동석,이재흥,류주환,이기윤,조성근,Jo, Choong Hee,Ham, Dong Seok,Lee, Jae Heung,Ryu, Juwhan,Lee, Kee-Yoon,Cho, Seong Keun 한국재료학회 2017 한국재료학회지 Vol.27 No.1
Zirconia nanoparticles were widely used as filler in order to get high refractive index layer. However, dispersion of nanoparticles is difficult due to their agglomeration in solvent. In this study, the dispersibility of the zirconia suspension is promoted by controlling the steric hindrance and electrostatic interactions through the adsorption of PEI according to alkali treatment time. Also, to induce improved dispersibility on suspension, we changed the dispersion conditions variously and fabricated an ink formulation method for the coating layer. Zirconia suspension was characterized by dynamic light scattering (DLS), Zeta potential measurement, Transmission Electron Microscope (TEM) and FT-IR. We were able to confirm that good dispersion of zirconia suspension by alkali treatment and PEI led to high refractive index.
상태방정식을 이용한 포화상태 수소의 열역학적 물성 모델링
조충희,이봉섭,신헌용 한국화학공학회 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.4
Fossil energy sources are limited in their sustainable use and expansion due to global warming caused by carbon dioxide emissions. Hydrogen is considered as a promising alternative to traditional fossil fuels. To ensure the stable long-term storage, it is necessary to accurately predict its thermodynamic properties at cryogenic temperatures. Therefore, this study aimed to investigate thermodynamic properties, such as saturated vapor pressure and density, enthalpy, and entropy of liquid and gas, using cubic equations of state that demonstrate relatively simple relationships. Among the three types of equations of state (Redlich-Kwong (RK), Soave-Redlich-Kwong (SRK), and Peng-Robinson (PR)), the SRK model exhibited relatively accurate prediction results for various physical properties.
리눅스 커널의 가상 인터페이스 및 하드웨어 오프로딩에 관한 연구
조충희 한국지식정보기술학회 2022 한국지식정보기술학회 논문지 Vol.17 No.2
Recently, many companies that provide cloud services are emerging. Most companies configure their servers based on Linux to build a resource-efficient infrastructure to provide cloud services. Linux is an open source operating system close to a standard that has been developed with the participation and review of many developers over a long period of time. Linux virtualizes the resources required for the cloud, enabling efficient resource management. In addition, Linux supports networking performance improvement by offloading kernel functions to the network interface card. With the latest kernel, we can use the virtual interface and offload function of Linux. However, we find problems that do not work harmoniously between virtual interfaces and offload functions. This paper specifically analyzes the kernel code of MACsec which is is an IEEE Media Access Control security standard. We presents various problems that may occur when the MACsec virtual interface and the Bond virtual interface are used together. In addition, we also present a problem that network processing performance may be degraded due to receive side scaling when the network interface card processes encrypted packets. These issues disclosed in this paper can be expected to consider various compatibility issues when Linux code is provided as a cloud infrastructure in the future.
조충희 한국지식정보기술학회 2022 한국지식정보기술학회 논문지 Vol.17 No.3
Telecommunication disasters have been regarded as national disasters that cause social chaos and economic losses in various fields such as medical care, emergency relief, public safety, finance, and commerce. Such disasters can be prevented by considering network availability during network design. However, telecommunication companies build networks with more focus on reducing construction costs than providing sufficient network availability. Network construction costs can be minimized if the network of other telecommunication companies are utilized without requiring the construction of 쟮ew protection paths to avoid traffic failure. Although most telecommunication companies have built their communication networks in geographically similar locations, they do not share networks despite the fact that shared networks could lead to improved network availability and reduced construction costs. Therefore, in this study, its introduced a method to minimize the network construction costs while improving the overall network availability. We defined an optimization problem to determine the optimal set of cable lines that can interconnect the networks and used a deep reinforcement learning algorithm to select the cable lines. The deep reinforcement learning algorithm learns to select the optimal cable line by repeating episodes of cable selection until target availability is satisfied. The result was compared with that of a general greedy algorithm to evaluate the reduction in construction costs.