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코스모스 체인에서 계정 간 통신 프로토콜 분석 및 다계정 간 정보 공유 시스템 제안
김진범(Jinbum Kim),박세진(Sejin Park) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
Blockchain has been growing steadily due to its several convenient features such as decentralization and anonymity, and many purpose-specific projects are expanding the blockchain ecosystem. As a result, there is an increasing demand for a wider range of interoperability than existing interoperability that focuses on token transfer. Cosmos provides a deeper range of cross-chain interoperability through the Interchain Accounts (ICA) protocol, which is based on its own communication protocol called Inter-Blockchain Communication (IBC). In this paper, we analyze the ICA protocol in terms of interoperability and propose several methods and systems for information sharing between accounts that can be derived from it.
약물전달 장치를 위한 Electrohydrodynamic Printing 연구
김진범(Jinbum Kim),황태헌(TaeHeon Hwang),류원형(WonHyoung Ryu) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
One of the major challenges in drug delivery system is to provide an appropriate dosage of therapeutic agents at a right time and location. For this, we have been developing micro-fluidic drug delivery systems comprised of an array of micro-fluidic channels and drug reservoirs. The size of drug reservoirs ranges from 10 ㎛ ~ 1㎜ and the filling the multiple micro-scale reservoirs with drug has been a major challenge. Electrohydrodynamics (EHD) jet printing technology was employed to load drug molecules into micro-scale reservoirs. Rhodamine B was used as a model drug and its controlled loading into micro-scale reservoirs are demonstrated using voltage and a distance between a injection nozzle and a reservoir.
TrustZone의 시큐어 타이머를 이용한 효율적인 커널 검사 시스템
김진목(Jinmok Kim),김동욱(Donguk Kim),박진범(Jinbum Park),김지훈(Jihoon Kim),김형식(Hyoungshick Kim) 한국정보보호학회 2015 정보보호학회논문지 Vol.25 No.4
커널 루트킷은 운영체제의 컴포넌트 사이의 통신을 가로채거나 수정할 수 있기 때문에, 운영 체제의 무결성을 훼손시킬 수 있는 가장 위협적이고 널리 퍼진 위협 중 하나로 인식되고 있다. 커널 루트킷이 이미 커널 권한을 획득하였기 때문에 루트킷이 설치된 공간에서 커널을 보호하는 것은 안전하지 않다. 따라서 커널보호 시스템은 커널과 동일한 공간으로부터 독립적이어야만 한다. 루트킷을 탐지하기 위해 많은 연구들이 수행되어 왔지만 다른 연구들과 달리 TrustZone 기반 연구는 커널과 동일한 공간으로부터 분리되고, 독립된 공간에서 커널을 보호하는 것이 가능하다. 하지만 제안된 방법들은 커널보호 시스템을 완전히 독립시킬 수 없는 단점이 있다. 이러한 이유로, 우리는 TrustZone의 시큐어 타이머를 이용한 효율적인 커널 검사 시스템을 제안한다. 이 시스템은 레퍼런스의 무결성을 보장하기 위해 커널 원본 이미지인 vmlinux을 활용하여 측정하였다. 또한, 보호영역 크기에 대한 유연성을 제공함으로써 효율적으로 커널보호 시스템을 운영하는 것이 가능하다. 실험 결과들은 제안된 커널보호 시스템이 완전히 독립되어 운영되고, 런타임동안 최대 6%정도의 성능만 저하시킨다는 것을 보여준다. Kernel rootkit is recognized as one of the most severe and widespread threats to corrupt the integrity of an operating system. Without an external monitor as a root of trust, it is not easy to detect kernel rootkits which can intercept and modify communications at the interfaces between operating system components. To provide such a monitor isolated from an operating system that can be compromised, most existing solutions are based on external hardware. Unlike those solutions, we develop a kernel introspection system based on the ARM TrustZone technology without incurring extra hardware cost, which can provide a secure memory space in isolation from the rest of the system. We particularly use a secure timer to implement an autonomous switch between secure and non-secure modes. To ensure integrity of reference, this system measured reference from vmlinux which is a kernel original image. In addition, the flexibility of monitoring block size can be configured for efficient kernel introspection system. The experimental results show that a secure kernel introspection system is provided without incurring any significant performance penalty (maximum 6% decrease in execution time compared with the normal operating system).
필터링을 이용하여 저화질과 점 잡음 이미지의 얼굴 인식 성능 개선 및 성능 비교
박언(Eon Park),김진범(Jinbum Kim),전주성,남기은(Gieun Nam),차성원(Seongwon Cha),박민지(Minji Park),박세진(Sejin Park) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
The purpose is to extract facial areas from noisy images. The face recognition performance is low in noise images. Use filtering to improve face recognition performance. We have two situations: low-definition images and point noise images. For both situations, we use Gaussian filtering and Median filtering to compare the filtering results with each situation to study which method is most efficient.
박상규(Sang-Gyoo Park),김진범(Jinbum Kim),권기영(Ki-Yeoung Kweon),이학성(Hahk-Sung Lee) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
This study describes aerodynamic characteristics for the HAWT (Horizontal Axis Wind Turbine) rotor blade using general CFD code. The aerodynamic analysis results are validated with the experimental result by the NREL (National Renewable Energy Laboratory)/NASA Ames wind tunnel test for S809 airfoil. In the case of wind turbine rotor blade. complex phenomena are appeared such as flow separation and re-attachment. Those are handled by using a commercial flow analysis tool. The 2-equation k-ω SST turbulence model and transition model appear to be well suited for the prediction. The 3-dimensional phenomena in the HAWT rotor blade is simulated by a commercial 3-D aerodynamic analysis tool. The optimal Tip Speed Ratio is predicted by using the GH Bladed which is a design tool for wind turbine.