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김기범,조영호,Kim, Kibeom,Cho, Youngho 한국인터넷정보학회 2022 인터넷정보학회논문지 Vol.23 No.5
Botnets have been exploited for a variety of purposes, ranging from monetary demands to national threats, and are one of the most threatening types of attacks in the field of cybersecurity. Botnets emerged as a centralized structure in the early days and then evolved to a P2P structure. Bitcoin is the first online cryptocurrency based on blockchain technology announced by Satoshi Nakamoto in 2008 and is the most widely used cryptocurrency in the world. As the number of Bitcoin users increases, the size of Bitcoin network is also expanding. As a result, a botnet using the Bitcoin network as a C&C channel has emerged, and related research has been recently reported. In this study, we propose an encrypted botnet C&C communication mechanism and technique in the Bitcoin network and validate the proposed method by conducting performance evaluation through various experiments after building it on the Bitcoin testnet. By this research, we want to inform the possibility of botnet threats in the Bitcoin network to researchers.
마그네슘합금의 산화저항성에 미치는 산화칼슘 첨가의 영향
김기범 ( Kibeom Kim ),김상필 ( Sangpil Kim ),김권후 ( Kwonhoo Kim ) 한국열처리공학회 2020 熱處理工學會誌 Vol.33 No.3
Due to excellent properties such as high specific strength and low density, application of magnesium alloys have been rapidly increased. However, magnesium alloy has a serious problem that is easily oxidized when exposed to high-temperature. For this reason, magnesium alloys have been generally used for SF6 gas such as protective cover gas in casting and melting, but it has been reported that this gas has a serious influence on global warming. Therefore, many researchers have been studied to improve the oxidation resistance of magnesium alloy. It was reported that addition of Be, Ca and CaO in magnesium alloy can improve the oxidation properties. In this study, the possibility of improving the oxidation resistance by adding CaO extracted from oyster shells was investigated. Oyster shells were completely decomposed into CaO and CO<sub>2</sub> by annealing. With the addition of CaO, a coexistence region of MgO + CaO was formed in the oxide layer and its thickness was also reduced. (Received May 14, 2020; Revised May 20, 2020; Accepted May 25, 2020)
HEV차량 변속기 냉각용 전동식 오일펌프 IPMSM 고출력화 최적 설계
김기범(Kibeom Kim),김미정(Mijeong Kim),박제헌(Jeheon Park),김경엽(Kyungyub Kim),박종원(Jongwon Park) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
In this paper, we design IPMSM to improve the EOP system for HEV transmission cooling. The improvements are miniaturization and high output. Pole · slot combination, shape of core, supply voltage, and demagnetization were considered in the design. Test bed was constructed to verify the performance of the designed IPMSM. It was confirmed that the IPMSM was designed as intended.
AZ61 마그네슘 합금의 어닐링 중 Ca의 첨가에 따른미세조직 변화에 미치는 영향
김기범 ( Kibeom Kim ),전준호 ( Joonho Jeon ),김권후 ( Kwonhoo Kim ) 한국열처리공학회 2021 熱處理工學會誌 Vol.34 No.2
Due to high specific strength and low density, AZ series magnesium alloys have been receiving high interest as a lightweight material. However, their industrial application is limited due to the phenomenon that the strength decreases at elevated temperature by the occurrence of softening effect because of the Mg<sub>17</sub>Al<sub>12</sub> phase decomposition. To solve this problem, many research were conducted to increase the high-temperature strength by forming a thermal stable second-phase component by adding new elements to the AZ magnesium. Especially, adding Ca to AZ magnesium has been reported that Ca forms the new second-phase. However, studies about the analysis of decomposition or precipitation temperature, formation composition, and components to understand the formation behavior of these precipitated phases are still insufficient. Therefore, the effect of Ca addition to AZ61 on the phase change and microstructure of the alloy during annealing was investigated. As a result of analysis of the initial and heat-treated specimen, AZ61 formed α-Mg matrix and precipitated phase of Mg<sub>17</sub>Al<sub>12</sub>, and AZX611 formed one more type of precipitated phase, Al<sub>2</sub>Ca. Also, Al<sub>2</sub>Ca was thermal stable at high temperatures. And after annealing, the laves phase was decomposed to under 10 μm size and distributed in matrix. (Received February 3, 2021; Revised February 10, 2021; Accepted March 17, 2021)