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임베디드 기기에서 실시간 획득한 건강 데이터의 경량 암복호화에 관한 연구
노정훈,박인규 국제차세대융합기술학회 2024 차세대융합기술학회논문지 Vol.8 No.3
최근에는 전자제품 및 웨어러블 기기를 포함한 IoT 제품들이 증가 추세에 있다. 하지만, IoT 기기가 증가할수록 보안 문제가 대두되면서 유선 및 무선 보안에 대한 관심이 증가하고 있다. 현재 많이 사용하고 있는 알 고리즘으로는 AES가 있으며, 임베디드 기반에서도 사용이 가능한 경량의 암복호화 알고리즘 들이 있다. 본 논문 은 임베디드 경량 블록 암호 알고리즘인의 응용에 관심이 있으며, 평문 데이터 대신에 실시간으로 측정한 심박 데 이터에 경량의 암복호화 알고리즘을 적용하는 실험을 수행하였다. 데이터를 분석한 결과, 본 데이터와 복호화 데 이터가 100% 일치하였다. LEA 알고리즘의 경우에 1개의 심박 데이터에 대한 샘플링 갯수는 초당 100개임을 확 인하였다. 향후, 샘플링 레이트를 높일 수 있도록 고성능의 임베디드 기기에서 실험을 수행할 예정이다. In recent years, the number of IoT products, including electronics and wearable devices, has been on the rise. However, with the increase in IoT devices comes security concerns, which has led to an increased focus on wired and wireless security. Currently, AES is a popular algorithm, and there are lightweight encryption algorithms that can be used on an embedded basis. This paper is interested in the application of embedded lightweight block cipher algorithms, and experiments were conducted to apply lightweight decryption algorithms to real-time measured heart rate data instead of plain text data. After analyzing the data, we found that the original data and the decrypted data matched 100%. For the LEA algorithm, we found that the number of samples for one heart rate data is 100 per second. In the future, we will conduct experiments on high-performance embedded devices to increase the sampling rate.
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Work Efficiency in a Double Cup Extrusion Process
노정훈,황병복 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.3
A double cup extrusion process (DCEP) has been analyzed numerically to investigate the characteristics of energy consumptions for a selected model material, AA 2024 aluminum alloy. The forming energy in a double cup extrusion process was analyzed in terms of ideal, redundant and frictional energy or work, which constitute of a total forming energy in metal forming process. Ideal and theoretical forming or deformation efficiencies were also examined for various process parameters chosen for analysis. The objective of this study is to investigate the influence of geometrical process parameters in DCEP on the characteristics of energy consumption or dissipation. It was revealed from this study that frictional energy was expected to be more dissipated for high reductions and low thickness ratios. It was also found that the theoretical work efficiency would decrease as the thickness ratio increases and the reduction decreases.
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우주 광통신을 위한 CCSDS 표준 개요 및 성능 분석
노정훈 국방기술품질원 2023 국방품질연구논집 Vol.5 No.2
In the new space age, not only the research community, but also the industry is showing great interest in space-related information and communication technology (ICT). One area that has attracted considerable attention is laser-based space communication, also known as free-space optical communication (FSO). FSO offers significant advantages over traditional radio frequency (RF) communication, including higher data transfer rates, lower power consumption, and reduced mass and space requirements. To promote interoperability, international space agencies work together through the interagency operations advisory group (IOAG) and consultative committee for space data systems (CCSDS) to establish optical communication standards. These standards support optical communication systems for both near-Earth and deep-space missions involving free-space links between the spacecraft and ground. This study comprehensively discusses the CCSDS for optical links. In addition, key performance metrics are presented in terms of the bit error rate (BER) obtained from simulations in the deep-space Poisson channel. These results provide a valuable reference for researchers and the space industry to exploit the advantages of laser-based optical links and drive the future of space telecom.
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Influence of punch geometry on surface deformation and tribological conditions in backward extrusion
노정훈,황병복 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.1
The main goal of this study is to examine the influence of process conditions such as reduction and punch face angle in backward extrusion, especially for surface stresses such as surface expansion, contact pressure and sliding velocity and distance. Extensive analysis has been performed for the forming efficiency and flow mode. The simulation has been conducted by applying rigid-plastic finite element method. It was found that the relative movement at the contact interface increases with decrease in punch face angle and with increase in reduction such that sliding mode is expected for smaller punch face angles with larger reductions.
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주행속도를 고려한 고속도로 나들목 연결로의 편경사 상향조정에 관한 연구
노정훈,김홍배,서무인,이길재 한국도로학회 2016 한국도로학회논문집 Vol.18 No.6
OBJECTIVES : Many roadway departure crashes on the freeway interchange are due to the running speed being greater than the design speed. This study aims to ensure a safe and pleasant driving experience for the driver by increasing the superelevation based on the running speed on the highway interchange ramp. METHODS: The mean running speed for each type of ramp is calculated on site survey more than 10 interchanges. Using the mean running speed, we calculated the superelevation and the side friction using the method given in “A Policy on Geometric Design of Highways and Street”(Pages 145-166, 2001). Then, we applied the modified method to the superelevation range. Finally, we ensured safety using the Degree of Safety that is proven by the centrifugal acceleration ratio as suggested by Joseph Craus (1978). RESULTS : The mean running speeds are 50 km/h and 65 km/h when the design speeds are 40 km/h and 50 km/h, respectively. After the application of the new method used in this study, the superelevation will be increased by 9.0% and 10.0% when the mean running speeds are 50 km/h and 65 km/h, respectively. CONCLUSIONS: A higher superelevation can give the driver a more comfortable and safe driving environment. However, the driver needs to be aware of snow and low-temperature conditions.
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Numerical analysis of tool geometry effect on the wear characteristics in a radial forward extrusion
노정훈,황병복 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8
The finite element analysis has been performed to investigate the tool wear characteristics in forming a central hub component with radialprotrusion by a radial forward extrusion process. The main objective of this study is to investigate the influence of tool geometries onthe wear characteristics of the mandrel and container surfaces. Two major process parameters such as annular gap height and mandreldiameter were adopted to examine the wear characteristics. SCM415H steel was selected as a model material in simulation by adoptingthe Archard’s wear model, which was verified by comparing with experimental results in the literatures. The results of present study weresummarized quantitatively in terms of wear profiles on the tool surfaces such as container and mandrel in terms of wear depth, contactpressure and sliding velocity. The localized wear depth is more sensitive to the variation of annular gap height with increase in mandreldiameter.
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