• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.220-221
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• 2023

EMR 시스템은 환자들의 진료, 처방 및 개인정보들을 중앙집중형으로 관리하는 시스템이다. 기존 EMR 시스템은 수기로 작성하던 진료기록을 컴퓨터를 통해 전자문서 형태로 관리하고 있다. 그러나 EMR 시스템은 외부로부터 해킹이나 데이터 유출에 대한 피해가 우려된다. 본 논문에서는 블록체인 기반의 하이퍼레저 패브릭과 DID를 사용하여 EMR 데이터를 분산 저장하여 환자의 진료기록을 안전하게 관리하는 시스템 기법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.260-261
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• 2023

공유 전동킥보드의 사용이 증가함에 따라, 불법 주차와 같은 문제점이 발생하고 있다. 시민들의 안전을 위협하는 문제를 해결하기 위해 CNN 모델 기반의 공유 전동킥보드 주차 판단 시스템을 구현하였다. 공유 전동킥보드에 탑재된 카메라, 기울기 센서를 통해 주차 상태를 판단하고, solidity와 python의 web3.py를 이용하여 컨소시엄 블록체인을 설계하였다. 주차 판단 기준이 되는 요소를 추가하고 가중치를 부여함으로써 신뢰 점수 식을 개선하였다. 본 논문에서 제안하는 모델을 통해 이용자의 자발적인 반납과 회사들의 효율적인 관리를 유도할 수 있다.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2022.10a
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• pp.415-416
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• 2022

전주는 가장 한국적인 도시답게 모든 사적과 여 채가 있는 한옥마을의 건물이 모두 목재와 기와로 지어진 한옥으로 밀집되어 있어서 화재와 지진, 풍수해 시에 소방차나 구조차의 진입에 어려움이 있다. 이로 인해 초기 화재 진압 시간이 지연됨에 따라 인명피해와 함께 국보와 사적지가 전소될 수 있어 인명과 문화재 보전을 위해 소방시설의 확충과 안전관리가 절실하게 필요하다. 이에 재난 대비를 위한 방법으로 소방 드론을 활용하는 것이 최적의 방법이 될 수 있다. 본 논문에서는 메타버스 플랫폼인 로블록스를 활용하여 스마트시티-전주를 구현하였고, 소방드론을 활용할 수 있는 드론 소방서를 제안하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.1240-1243
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• 2023

의료기관에서 접근이 용이한 마약류 약물로 오남용하는 사례가 지속적으로 증가하고 있다. 이를 해결하고자 본 논문은 블록체인 프레임워크인 하이퍼레저 패브릭을 기반으로 구축된 약물 오남용 관리 시스템을 제안한다. 하이퍼레저 패브릭의 분산 원장 기능을 사용하면 의약품 거래를 투명하게 기록하고 처방 기록을 안전하게 보존하여 모든 거래 세부 정보를 변조할 수 없게 된다. 또한 약물 사용 기록을 추적하고 남용을 방지하기 위해 과다 복용 사용자를 규제하는 기능을 제안한다. 본 논문이 약물 오용을 크게 완화하고 과다 복용 사용자 보호가 가능할 것이라 기대한다.

• Journal of Navigation and Port Research
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• v.32 no.1
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• pp.1-7
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• 2008

Since the shipbuilding industry is at its peak to assimilate the large volume of orders in recent years, the Floating Dock has been an alternative to the dry dock which takes a certain period of time to build. Hence the use of Floating Dock is steadily increasing. Since the Skid Launching System(SLS) is used in Floating Dock, the balancing of the ship while launching is important and achieved by adjusting the Ballast tank of the Floating Dock. In this paper a Floating Dock Control Simulator for SLS is developed through the on-line interface of VRC(Valve Remote Control), Tank Level & Draft Measuring System and Valve Control algorithm on Simulation Tank Plan.

• Journal of the Society of Naval Architects of Korea
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• v.55 no.4
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• pp.297-305
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• 2018

In a shipyard, block lifting is an important process in the production of ships and offshore structures. Block lifting is a sensitive process because lifting blocks have to be erected with exact positions and orientations. If we use a numerical method for the process, it is important to find tensions of wires and positions of equalizers to maintain the initial equilibrium position of the block. At this time, equations of motion of the block should be solved to calculate the initial equilibrium position of the block. Because the solving technique changes according to the number of equalizers, a suitable equation for the corresponding problem is required. In this study, three types of equations are proposed to find the initial equilibrium position of the block according to the number of equalizers. The Newton-Raphson's method is used to solve nonlinear simultaneous equations and the optimization method is used to determine the appropriate solution to the undetermined problem. To evaluate the applicability of the proposed methods, the dynamic simulations are performed using the tensions calculated from the proposed methods, and the results are discussed. The results show that the proposed methods can be effectively used to determine initial equilibrium position of the block for the block lifting.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.42 no.4 s.334
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• pp.29-36
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• 2005

This paper presents the first hardware design of ARIA that KSA(Korea Standards Association) decided as the block encryption standard at Dec. 2004. The ARIA cryptographic algorithm has an efficient involution SPN (Substitution Permutation Network) and is immune to known attacks. The proposed ARIA design based on 1 cycle/round include a dual port ROM to reduce a size of circuit md a high speed round key generator with barrel rotator. ARIA design proposed is implemented with Xilinx VirtexE-1600 FPGA. Throughput is 437 Mbps using 1,491 slices and 16 RAM blocks. To demonstrate the ARIA system operation, we developed a security system cyphering video data of communication though Internet. ARIA addresses applications with high-throughput like data storage and internet security protocol (IPSec and TLS) as well as IC cards.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.12
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• pp.1193-1200
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• 2008

The procedure of design for reliability which consists of reliability analysis and Failure Modes and Effects Analysis(FMEA) is established and reliability assesment is performed for the nano-satellite air-launching rocket, Mirinae II. By means of using the reliability analysis result, the feasibility to insert the Mirinae II to the target orbit for given mission time under operating environment is assessed. During the reliability analysis process, the system is categorized by Work Breakdown Structure(WBS), and reliability structure is defined by both Reliability Block Diagram(RBD) and schematics of the system. FMEA is used to determine the risk priority number of components and parts. The target reliability is satisfied by changing the design of components and parts with high-risk, hence the design for reliability to put the satellite in to the target orbit safely has been performed.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.28 no.5
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• pp.1059-1070
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• 2018

The block cipher Zorro is designed to reduce the implementation cost for side-channel countermeasure. It has a structure similar to AES, but the number of S-Boxes used is small. However, since the master key is used as the round key, it can be vulnerable to related key attacks. In this paper, we show key recovery attacks on Zorro using related-key differential characteristics. In addition, the related key differential characteristics are fatal when Zorro is used as the base block cipher of the hash function. In this paper, we describe how these characteristics can be linked to collision attacks in the PGV models.

• Tunnel and Underground Space
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• v.11 no.2
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• pp.156-166
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• 2001

A stochastic continuum(SC) modeling technique was developed to simulate the groundwater flow pathway in fractured rocks. This model was developed to overcome the disadvantageous points of discrete fracture network(DFN) modes which has the limitation of fracture numbers. Besides, SC model is able to perform probabilistic analysis and to simulate the conductive groundwater pathway as discrete fracture network model. The SC model was formulated based on the discrete fracture network(DFN) model. The spatial distribution of permeability in the stochastic continuum model was defined by the probability distribution and variogram functions defined from the permeabilities of subdivided smaller blocks of the DFN model. The analysis of groundwater travel time was performed to show the consistency between DFN and SC models by the numerical experiment. It was found that the stochastic continuum modes was an appropriate way to provide the probability density distribution of groundwater velocity which is required for the probabilistic safety assessment of a radioactive waste disposal facility.