Crypft+ : Python/PyQt 기반 AES와 HASH 알고리즘을 이용한 파일 암복호화 시스템

신동호,배우리,신형규,남승진,이형우,Shin, Dongho,Bae, Woori,Shin, Hyeonggyu,Nam, Seungjin,Lee, Hyung-Woo 한국사물인터넷학회 2016 한국사물인터넷학회 논문지 Vol.2 No.3

본 논문에서는 IoT 시스템 또는 개인별 문서 파일 관리 과정의 보안성을 향상시키기 위해 개선된 파일 암복호화 시스템인 Crypft+를 개발했다. Crypft+ 시스템은 Python을 이용하여 핵심 보안 모듈을 개발하였으며, PyQt를 사용하여 사용자 인터페이스를 설계 및 구현하였다. 또한 가장 보안성이 뛰어난 AES 기반 대칭키 암호 알고리즘과 SHA-512 기반 해쉬 알고리즘을 이용하여 컴퓨터 시스템 내부에 저장된 중요 파일에 대한 암호화 및 복호화 과정을 수행할 수 있도록 구현하였다. 또한 Cx-Freezes 모듈을 사용하여 구축된 프로그램을 exe 기반 실행 파일로 변환하는 기능을 구현하였으며, 프로그램 사용에 있어 이해를 돕는 설명서를 프로그램 내부에 포함시켜 직접 다운로드 받을 수 있도록 구현하였다. In this paper, we have developed Crypft+ as an enhanced file encryption/decryption system to improve the security of IoT system or individual document file management process. The Crypft+ system was developed as a core security module using Python, and designed and implemented a user interface using PyQt. We also implemented encryption and decryption function of important files stored in the computer system using AES based symmetric key encryption algorithm and SHA-512 based hash algorithm. In addition, Cx-Freezes module is used to convert the program as an exe-based executable code. Additionally, the manual for understanding the Cryptft+ SW is included in the internal program so that it can be downloaded directly.

탄소섬유 시트 방전극의 입자 크기 별 집진 특성 및 공기청정기로의 응용

신동호,우창규,홍기정,김학준,김용진,한방우,shin, Dongho,Woo, Chang Gyu,Hong, Keejung,Kim, Hak-Joon,Kim, Yong-Jin,Han, Bangwoo 한국입자에어로졸학회 2018 Particle and Aerosol Research Vol.14 No.3

The market for improving the indoor air quality is continuously increasing, and air cleaners are the representative products. As interest in indoor air quality increases, so are the ultrafine particle which are harmful to the human body. Despite its many advantages, electrostatic precipitators are less used in indoor air due to ozone production. In this study, the carbon fiber sheet was applied to the discharge electrode and compared with the conventional tungsten wire discharge electrode. The particle collection efficiency and the amount of ozone generation were measured for 10-100 nm particles. Furthermore, it was applied to commercial air purifier with electrostatic precipitator to compare particle removal performance. The carbon fiber sheet type discharge electrode generates a small amount of ozone, and thus it can be applied to improve indoor air quality.

CCD기반의 방사선치료 중 실시간 자동 환자 위치보정 시스템 개발: 타당성 연구

신동호,정광주,김미영,손재만,윤명근,임영경,이세병,Shin, Dongho,Chung, Kwangzoo,Kim, Meyoung,Son, Jaeman,Yoon, Myonggeun,Lim, Young Kyung,Lee, Se Byeong 한국의학물리학회 2013 의학물리 Vol.24 No.3

방사선 치료 시 방사선이 조사되는 동안 환자의 움직임을 모니터링하는 것은 치료의 성공을 결정 하는 중요한 요인이다. 따라서 방사선이 조사되는 동안 환자의 움직임을 실시간으로 감시하고 움직인 치료위치를 자동으로 보정 할 수 있는 시스템을 개발 하였다. 원점을 중심으로 직교하게 위치한 2개의 CCD 카메라를 이용하여 3차원적 환자의 위치를 확인 하고, 틀 맞춘 상호교차 비교법(normalized cross-correlation method)을 이용한 영상 본 맞춤(image pattern matching) 방법을 이용한 환자위치 모니터링 시스템을 개발하였다. CCD카메라로부터 촬영된 영상을 컴퓨터로 전달하여 위치 변화를 정량적으로 분석 하여 빔 켜고 끔(beam on and off)를 위한 방아쇠신호(trigger signal)를 발생시키고, 이동치료대(moving couch)의 모터를 제어할 수 있는 시스템을 개발하였다. 이 시스템은 0.5 mm 이하의 분해능으로 환자의 위치를 자동으로 보정할 수 있었다. Upon radiation treatment, it is the important factor to monitor the patient's motion during radiation irradiated, since it can determine whether the treatment is successful. Thus, we have developed the system in which the patient's motion is monitored in real time and moving treatment position can be automatically corrected during radiation irradiation. We have developed the patient's position monitoring system in which the patient's position is three dimensionally identified by using two CCD cameras which are orthogonal located around the isocenter. This system uses the image pattern matching technique using a normalized cross-correlation method. We have developed the system in which trigger signal for beam on and off is generated by quantitatively analyzing the changes in a treatment position through delivery of the images taken from CCD cameras to the computer and the motor of moving couch can be controlled. This system was able to automatically correct a patient's position with the resolution of 0.5 mm or less.

화력발전소 굴뚝 미세먼지 측정을 위해 개발한 이젝터-다공튜브 희석장치의 희석비 검증

신동호,김영훈,서현수,홍기정,김학준,김용진,한방우,이가영,천성남,황정호,Shin, Dongho,Kim, Young-Hoon,Hong, Keejung,Kim, Hak-Joon,Kim, Yong-Jin,Han, Bangwoo,Lee, Ga-Young,Chun, Sung-Nam,Hwang, Jungho 한국입자에어로졸학회 2019 Particle and Aerosol Research Vol.15 No.3

The exhaust emissions from coal-fired power plants have received much attention because coal-fired power plants are the one of the largest sources of particulate matter (PM) emissions in South Korea. To measure the PM10 and PM2.5, we developed the novel diluter which is comprised of ejector and porous tube in series. The dilution ratio must be defined to calculate particle concentrations of the sampled air as well as to probe match for the isokinetic sampling. For this reason, we verified the dilution ratio of the developed diluter by the flow rate, numerical solution, gas concentration and particle concentration. The ejector-supplied flow rates were 10-50 L/min and the porous tube-supplied flow rates were 30, 50 L/min in this study. All methods above showed similar dilution ratios to each other within 10 % error rate. The dilution ratio was confirmed by comparing mass concentrations before and after the dilution process.

에어핸들링 유닛의 공기정화용 전기집진기의 방전극 비교

신동호,우창규,김학준,김용진,한방우,Shin, Dongho,Woo, Chang Gyu,Kim, Hak-Joon,Kim, Yong-Jin,Han, Bangwoo 한국입자에어로졸학회 2017 Particle and Aerosol Research Vol.13 No.1

Indoor air quality is of increasing concern because it is closely related human health. An air handling unit (AHU) can be used to control the indoor air quality related to particulate matters and $CO_2$ as well as air conditioning such as temperature and humidity of indoor air. An electrostatic precipitator has a high collection efficiency and low pressure drop, however, ozone can possibly generate from its chargers, which is one of drawbacks to apply it for indoor air control. Here we compared four charging electrodes such as a $50{\mu}m$ tungsten wire, a $100{\mu}m$ tungsten wire, a $16{\mu}m$-thickness Al foil and a carbon fabric comprised of $5-10{\mu}m$ fibers. The carbon fabric electrode showed a superior particle collection efficiency and a lower ozone generation at a given power consumption compared to tungsten wires of 50, $100{\mu}m$ and an Al foil electrode. This low ozone generating, micro-sized electrode can be applied to the electrostatic precipitator in AHU for indoor air control.

세기변조방사선치료의 정도관리를 위한 두경부 팬톰 제작에 관한 연구

신동호,박성용,김주영,이세병,조정근,김대용,조관호,Shin Dongho,Park Sung-Yong,Kim Joo Young,Lee Se Byeong,Cho Jung Keun,Kim Dae Yong,Cho Kwan Ho 한국의학물리학회 2005 의학물리 Vol.16 No.1

m3 (BrainLAB Inc., Germany)를 이용한 두경부 IMRT의 정도관리에서 테이블과 갠트리의 위치에 따라 테이블에 의한 선량감쇠가 일어나 정확한 처방 선량을 측정할 수 없다. 이 문제를 해결하기 위해 두경부 종양의 세기변조방사선치료를 위해 Brain Lab사의 환자테이블 mount를 이용해 설치할 수 있는 원통형 두경부 팬톰을 제작하였다. 이를 이용하여 환자테이블에 의한 선량 감쇠를 측정하고 실제 임상에 적용함으로써 테이블에 의한 선량 감쇠로 인한 선량분포의 차이를 확인할 수 있었다. 측정결과 환자테이블에 의한 점 선량의 감쇠가 최대 약 35%가 났으며 실제 환자 치료계획에 대한 정도관리에서의 절대점 선량의 경우 5.4%의 선량차이를 나타냈다. For the QA of IMRT treatment of head and neck cancer by using M3 (BrainLAB Inc. Germany), it is not easy to measure delivery dose exactly because the dose attenuation appears by the couch according to the position of table and gantry. In order to solve this problem, we fabricated head and neck phantom which would be implemented on the couch mount of Brain Lab Inc. We investigated dose attenuation by the couch and found the difference of dose distribution by the couch, in the applying this phantom to the clinic. After measurement, we found that point dose attenuation was 35% at maximum and dose difference was 5.4% for a point dose measurement of actual patient quality assurance plan.

광산란법을 이용한 국내 석탄화력발전소 굴뚝에서 배출되는 PM₁₀, PM_2.5 측정 및 분석

신동호,김영훈,홍기정,이건희,박인용,김학준,김용진,한방우,황정호,Shin, Dongho,Kim, Younghun,Hong, Kee-Jung,Lee, Gunhee,Park, Inyong,Kim, Hak-Joon,Kim, Yong-Jin,Han, Bangwoo,Hwang, Jungho 한국입자에어로졸학회 2020 Particle and Aerosol Research Vol.16 No.4

Air pollutants emitted from chimneys of coal-fired power plants are considered to be a major source of fine particulate matter in the atmosphere. In order to manage fine particle in the chimney of a coal-fired power plant, it is necessary to know the concentration of fine particle emitted in real time, but the current system is difficult. In this study, a real-time measurement system for chimney fine particle was developed, and measurements were performed on six coal-fired power plants. Through the measurements, the mass concentration distribution according to the particle size could be secured. All six chimneys showed bimodal distribution, and the count median diameters of each mode were 0.5 and 1.1 ㎛. In addition, it was compared with the gravimetric measurement method, and it was determined that the relative accuracy for PM10 was within 20%, and the value measured using the developed measuring instrument was reliable. Finally, three power plants were continuously measured for one month, and as a result of comparing the concentration of PM10 according to the amount of power generation, it was confirmed that the PM10 discharged from the chimney increased in the form of an exponential function according to the amount of power generation.

골밀도 향상을 위한 대체 요법으로 칼슘/마그네슘 복합체의 효능

신동호,이동섭,션 리,김세웅,Shin, Dongho,Lee, Dong Sup,Lee, Sean S.,Kim, Sae Woong 한국식품영양학회 2022 韓國食品營養學會誌 Vol.35 No.5

The medicines for treating osteoporosis currently in use have minor to severe side effects, and can be financially burdensome. Thus, there is a need for prevention and alternative supplement that is relatively inexpensive, and can be easily consumed daily as an alternative dietary therapy. In this study, bone marrow density of the spine and femur of osteoporosis patients were checked before and after consuming complex composed of calcium and magnesium, considered to be the core of bone mineral content. November 2017-November 2021, patients with T-score of less than -2.5 or -1.0 < T-score < -2.5 with history of fractures or recent fractures were enrolled. The data of 60 patients who orally administered Ionized Cal/Mag^TM Complex were reviewed retrospectively, and it was significantly confirmed that the average value of T-score was up-regulated by 0.5. Additionally, the cumulative dose was observed to have a positive effect, on the improvement of BMD in the 2nd Lumbar and Femur neck. It is expected that better results will be achieved if use of the supplement is continued.

온라인 P2P 대출에서 상환실패의 요인에 대한 실증연구

신동호(Shin Dongho),채명신(Chae Myungsin) 대한경영학회 2011 대한경영학회 학술발표대회 발표논문집 Vol.2011 No.2

온라인P2P 대출은 IT기술의 발전에 따라 자금이 필요한 사람과 자금을 투자하고자 하는 사람이 온라인 상에서 만나 대출이 이루어지는 서비스를 말한다. 본 연구는 이러한 온라인P2P 대출거래에서 이루어지는 상환실패(default)의 요인을 분석하기위해 먼저 차용인(loanee)의 객관적 신용정보를 대상으로 상환실패 요인을 분석하였으며, 다음에는 온라인P2P 상에서 이루어지는 차용인의 행동과 투자자(loaner)의 행동에서 상환실패 요인을 분석하였다. 마지막으로 연도별로 시간이 경과함에 따르는 상환실패에 영향을 미치는 요인도 분석하였다. 현재 국내 온라인상에서 운영 중인 P2P 대출업체의 자료를 이용하여 분석한 결과, 상환에 실패한 차용인은 객관적 신용정보 변수 중에서 특수기록(면책이나 회생, 신용불량 등의 경험 기록)이 상환실패에 유의한 변수로 분석되었다. 특수기록은 부(-)의 값을 가지고 있어 특수기록 경험이 없을수록 상환실패가 많아 특수기록을 가진 사람은 상환실패로 인한 추가적인 신용저하를 경계하는 것으로 분석되었다. 두번째로 투자자 및 차용인의 온라인상 행동특성을 분석한 결과, 차용인은 투자를 받기위해 많은 활동을 하였지만 그것이 결국 상환실패에 정(+)의 영향을 주고 있음을 알 수 있었다. 시간적 요인이 상환실패에 주는 영향을 분석해 보면 시간이 흐를수록 차용인의 신용정보와 온라인상에서의 활동 등 객관적인 요인이 상환실패에 영향을 많이 주고 있었으며 온라인P2P 대출제도 운영 초기단계에는 유의한 변수였던 차용인의 주관적인 요소는 시간이 흐를수록 유의하지 않은 변수로 변화함을 알 수 있었다. 본 연구는 과학적인 기법을 이용하여 체계적으로 온라인P2P 대출제도의 상환실패 요인을 분석하였다. 이들 요인을 온라인P2P 대출제도에 적용하여 상환실패를 사전에 경고하는 예방체계를 만든다면 보다 신뢰성이 높은 온라인 대출시장 활성화에 기여 할 수 있을 것으로 기대한다. Online P2P loan refers to the financial service offered for online transaction between a loanee who desires to make loans and a loaner wishing to invest on it. This research, in order to investigate the defaulting factors in an Online P2P loan transaction, analyzed the objective credibility data of the loanee and the online activities of the loanee and loaner that may lead to defaulting factors. Lastly, the researchers also investigated on the different factors that have affected the defaulting factor by each year. Lastly, as a result of analyzing characteristics of loanee objective credit information and loaner online activities in a yearly basis, the researchers found that at the initial stages in the operation of online loan services, the purpose of loan proved to be a significant variable: therefore, loans with appeals of emotional by the loanee were often granted, resulting to equal number of defaulting. But as the time elapses, the significance of the credit information of the loanee , such as special record, requested amount, and successful loan returns, gradually increased; affirming the transition from emotional factors to objective factors. For additional data, the researchers also analyzed the change in factors reflective to the current trend such as defaulting of young males, youth unemployment, and increasing unemployment rates. This research employs scientific method to systematically analyze the loan defaulting factors of Online P2P Loan system. The researchers hope to contribute to the revitalize the online loan industry with higher confidence through applying the defaulting factors to the Online P2P loan system by systematizing an early prevention method to warn off possible loan defaulting.

수소 압력용기 재검사 기술의 음향방출시험 적용 타당성 분석

신동호(Dongho Shin),이민경(Minkyung Lee),김정환(Junghwan Kim),이재훈(Jaehun Lee) 한국가스학회 2022 한국가스학회 학술대회논문집 Vol.2022 No.5