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Hojun Seong,Keonyong Lee,Seong-je Cho,Sangchul Han,Minkyu Park 한국차세대컴퓨팅학회 2021 한국차세대컴퓨팅학회 학술대회 Vol.2021 No.11
Vehicles with an Audio-Video Navigation (AVN) system have become another source of potential digital evidence. The AVN systems in modern cars retain information and event data from mobile devices connected to the car’s infotainment module, and navigation data in the form of tracklogs. These data provide a time history of a car’s geolocation that may be used to investigate an incident involving an automobile or reconstruct a crash. There has been little research into what types of user artifacts can be found on the AVN systems, and whether the AVN systems provide more vehicle event information than the connected mobile devices. For this study, we used the AVN system of a KIA NIRO EV vehicle for digital data acquisition and analysis. We have found that the AVN system provided some amounts of user data (start log, favorite routes, last destination search history, etc.). The acquired data and analyzed results can serve as basic digital evidence for vehicle forensic research.
Analyzing Bluetooth HCI Snoop Log of Android Infocar App for Vehicle Diagnostics
Hojun Seong,Jiheun Jung,Sanchul Han,Minkyu Park,Seong-je Cho 한국차세대컴퓨팅학회 2022 한국차세대컴퓨팅학회 학술대회 Vol.2022 No.10
As vehicles increasingly become electrically powered, recently manufactured vehicles contain, on average, more than 75 ECUs. The task of controlling the ECU to drive a vehicle and diagnose its condition is becoming more complex. Therefore, vehicle manufacturers are providing various in-vehicle diagnosis services, and mobile services that diagnose vehicle status are emerging, which connect via Bluetooth or WiFi, with an OBD scanner that reads data from the ECU. Through these services, packets can be collected and analyzed to assist in vehicle accident investigation and cause identification. We present the case study of packet collection and analysis using these services. Infocar's OBD scanner and Infocar mobile app installed on Galaxy S8 device are connected together and the packets exchanged between them are collected using the Bluetooth HCI snoop log function. It was confirmed that the analysis results can help to reconstruct the state of the vehicle and the behavior of the driver.
연구용 원자로의 감쇠탱크 설계 및 평가방안에 관한 연구
정민규(Minkyu Jung),박홍범(Hong-Beom Park),서경우(KyoungWoo Seo),김성훈(Seong-Hoon Kim) 대한기계학회 2018 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.6 No.2
연구용 원자로에서 일차 냉각 계통은 노심을 직접 통과하면서 냉각을 수행한다. 이로 인해 다종의 방사화 생성물을 포함하고 있는데, 고에너지 감마선을 포함하는 N-16 을 감소시키기 위해 감쇠탱크를 설치하게 된다. 감쇠탱크는 매우 큰 부피를 가지고 있어, 원자로 건물의 상당부를 차지해 보다 효율적이며 정교한 설계를 요구한다. 감쇠탱크는 원통형 실린더 형상에 상하부 타원형 헤드로 구성되어 있으며, 내부에는 다공판과 유동 가이드가 설치되어 있다. 커다란 부피는 냉각재의 속도를 늦추는 기능을 수행하는 반면, 다공판의 홀과 유동 가이드는 감쇠탱크 내 고른 유동 분포를 가지도록 한다. 감쇠탱크설계는 탱크 내 체류시간으로 평가할 수 있으며, 이를 수치적으로 비교하기 위해 입자 활용 방법 및 스칼라 활용방법을 적용하였다. To decrease the N-16 radioactivity, a decay tank is installed at the reactor outlet pipes in PCS (Primary Cooling System) for research reactors. The decay tank represents a significant portion of building due to own huge volume, thus efficient and elaborate design is required. The decay tank consists of circular cylinder body, two elliptical heads, perforated plates, and flow guides. The perforated plate makes evenly distributed flow using plate holes with decreased flow velocity. A numerical method is utilized to analyze the flow features and calculate the residence time inside the tanks. To obtain more accurate residence time, available numerical methods, such as streamline, massless particle, and user-defined scalar, are used and compared.
Pae, Seong Ryul,Byun, Segi,Kim, Jekyung,Kim, Minkyu,Gereige, Issam,Shin, Byungha American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.1
<P>Recently, the trend in inverted hybrid perovskite solar cells (PVSCs) has been to utilize NiO<I><SUB>x</SUB></I> as hole transport layers. However, the majority of reported solution-processed NiO<I><SUB>x</SUB></I> films require a high-temperature thermal annealing process, which is unfavorable for large-scale manufacturing and suffers from lack of uniformity. We report, for the first time, e-beam evaporation as a low-temperature vacuum process for the deposition of NiO<I><SUB>x</SUB></I> hole transport layers for PVSCs. Device characterization shows that efficiency is on par with solution-processed methods, the highest efficiency at 15.4% with no obvious hysteresis. Differences are found to be due to the presence of more Ni<SUP>3+</SUP> in e-beam evaporated NiO<I><SUB>x</SUB></I>, which are responsible for a lower transmittance but higher conductivity. Most importantly, e-beam-evaporated NiO<I><SUB>x</SUB></I>-based PVSCs show greater uniformity and reproducibility compared to spin-coated NiO<I><SUB>x</SUB></I>-based PVSCs. Finally, e-beam-evaporated NiO<I><SUB>x</SUB></I> has the additional advantage of being produced by a low-temperature deposition process and applicable over large areas. This work, therefore, represents a significant step toward large-area PVSCs, where e-beam evaporation can be used for the low-temperature uniform deposition of charge-transport layers, such as NiO<I><SUB>x</SUB></I>.</P> [FIG OMISSION]</BR>
무인 항공 전자탐사 이론 연구: 임의 모양의 송신루프에 의한 전자기장 반응 계산 및 분석
방민규 ( Minkyu Bang ),오석민 ( Seokmin Oh ),설순지 ( Soon Jee Seol ),이기하 ( Ki Ha Lee ),조성준 ( Seong-jun Cho ) 한국지구물리·물리탐사학회 2018 지구물리와 물리탐사 Vol.21 No.3
Recently, unmanned aircraft EM (electromagnetic) survey based on ICT (Information and Communication Technology) has been widely utilized because of the efficiency in regional survey. We performed the theoretical study on the unmanned airship EM system developed by KIGAM (Korea Institute of Geoscience and Mineral resources) as part of the practical application of unmanned aircraft EM survey. Since this system has different configurations of transmitting and receiving loops compared to the conventional aircraft EM systems, a new technique is required for the appropriate interpretation of measured responses. Therefore, we proposed a method to calculate the EM field for the arbitrary shaped transmitter and verified its validity through the comparison with analytic solution for circular loop. In addition, to simulate the magnetic responses by three-dimensionally (3D) distributed anomalies, we have adapted our algorithm to 3D frequency-domain EM modeling algorithm based on the edge-FEM (finite element method). Though the analysis on magnetic field responses from a subsurface anomaly, it was found that the response decreases as the depth of the anomaly increases or the flight altitude increases. Also, it was confirmed that the response became smaller as the resistivity of the anomaly increases. However, a nonlinear trend of the out-of-phase component is shown depending on the depth of the anomaly and the used frequency, that makes it difficult to apply simple analysis based on the mapping of the magnitude of the responses and can cause the non-uniqueness problem in calculating the apparent resistivity. Thus, it is a prerequisite to analyze the appropriate frequency band and flight altitude considering the purpose of the survey and the site conditions when conducting a survey using the unmanned aircraft EM system.
조성제(Seong-je Cho),김동진(Dongjin Kim),박민규(Minkyu Park) 한국정보기술학회 2013 한국정보기술학회지 Vol.11 No.2
소프트웨어 지적재산권(intellectual property)을 침해하는 대표적 위협에는 소프트웨어 도용(theft)과 악의적 역공학(reverse engineering)이 있다. 소프트웨어 도용에 대한 위협에 대한 방어 기법으로는 소프트웨어 워터마킹(watermarking)과 버스마킹(birthmarking)이 있고, 소프트웨어에 대한 악의적 역공학 위협에 대한 방어 기법으로는 코드 난독화(code obfuscation)가 있다. 소프트웨어 워터마킹에서는 대상 프로그램에 유일한 식별자(워터마크)를 탑재시켜 배포하고, 소프트웨어 도용 시에 그 소프트웨어가 워터마크를 포함하고 있음을 증명하여 원 저작자나 불법 배포자를 식별한다. 소프트웨어 버스마킹은 소프트웨어에 본래부터 존재하는 특징(버스마크)에 기반하여 각 소프트웨어를 식별할 수 있는 기법이다. 소프트웨어 전체 또는 부분이 도용되었을 경우, 그 소프트웨어들로부터 버스마크를 추출하여 비교함으로써 한 소프트웨어가 다른 소프트웨어의 복사본임을 판단할 수 있다. 코드 난독화는 악의적 사용자가 소프트웨어를 역분석하는 것을 방어하기 위해, 본래 프로그램 의미를 보존하면서 다양한 변환 방법을 적용하여 소프트웨어를 분석ㆍ이해하기 어렵게 만드는 기법이다.
서민규(Minkyu Suh),황진성(Gin Seong Hwang),황재완(Jaewan Hwang),박은주(Eunju Park),임한규(Hankyu Lim) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.12
주가 가격은 지역 문화와 상관없이 전 세계적인 거래가 이루어지는 품목입니다. 이러한 주가는 기축통화의 환율과 소비자 물가지수, 국제 유가 등 여러 국제적인 요인에 의해 가격이 변동되는데 본 논문에서는 현재 펜데믹 상황에서의 주가 변동을 예측하고자 새로운 요인으로 코로나 확진자 수를 추가하였다. 모델은 주로 시계열 데이터에서 사용되는 LSTM 모델을 사용하여 학습을 진행하였다. 학습에 사용된 데이터는 2021년 6월부터 2022년 7월까지의 데이터를 사용하여 데이터 셋을 구축하였다. Stock prices are items that are traded worldwide, regardless of local culture. These stock prices fluctuate according to various international factors such as the exchange rate of the key currency, consumer price index, and international oil price. The model was trained using the LSTM model mainly used for time series data. The data used for training was constructed using data from June 25, 2021 to July 15, 2022.