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라즈베리파이를 활용한 IoT 환경에서 다중 인증 시스템 구현
이성목(Seongmok Lee),정경창(Kyungchang Jung),오홍석(Hongseok Oh),이의종(Euijong Lee) 한국정보기술학회 2021 Proceedings of KIIT Conference Vol.2021 No.11
다중 인증 시스템은 사용자 인증 시 두 개 이상의 인증 수단을 사용하도록 하여 보안성을 높인 인증방식이다. 본 논문은 사용자 인증 시 최소 두 개 이상의 생체 인증을 사용하도록 하여 보안성을 높였다. 또한 각 인증방식 별로 보안 수준에 따라 점수를 부여하였으며, 특정 점수 이상이 되어야 인증이 가능하도록 하였다. 본 논문은 홍채인식, 지문인식, 얼굴인식, RFID, QR-code, 패스워드의 기능을 라즈베리파이를 통해 구현하고 IoT 환경에서 동작하도록 하는 것을 목표로 하였다.
고속열차 교행시 차량 실내 · 외 압력변동에 관한 수치적 연구
문성목(Seongmok Moon),이경훈(Kyounghoon Lee) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
A three-dimensional unsteady computational study is performed to assess the inside and outside pressure variation of two high-speed trains passing by each other, and to estimate the aural discomfort of the passenger through comparisons between the computed results and the safety criterion of domestic trains. The dynamic mesh technique and the smooth starting approach are adopted to simulate the transient vehicle movement. During passing by each other in the tunnel, complex pressure wave interactions within the tunnel occur due to the pressure waves by the opposite train. It leads to the rapid pressure variation on the internal and external surface of vehicle, and finally results in the aural discomfort of the passengers. Computed results show that the internal maximum pressure variations during passing by each other in the tunnel meet the safety criterion of vehicle. In addition, the internal maximum pressure variation when two trains pass by each other in the tunnel increase 1.5 to 2 times more than that when one train travels in the tunnel.
문성목(Seongmok Moon),노주현(Joohyun Rho),이경훈(Kyounghoon Lee) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
In this study, a 3-dimensional transient computational study is carried out to estimate the effect of pressure wave for high speed trains that are crossing in open air or tunnel at 350km/h speed. The dynamic mesh technique is applied to simulate the reciprocal motion of high speed trains, and the initial condition using a smooth starting method is adopted to eliminate a numerical pressure wave that may initially take place by the impulsive start. Pressure waves give rise to large pressure transients that a positive-negative pulse pressure is generated as the train head passes another train, which a negative-positive pulse as the train tail passes. Pressure wave characteristics for the crossing of high speed trains are represented through the numerical analysis, which predicts resultant aerodynamic forces by pressure transient acting on the trains.
[세션초청논문] 터널 내에서 주행하는 고속열차의 압력파 특성에 관한 연구
문성목(Seongmok Moon),이경훈(Kyoung Hoon Lee) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
A computational study is conducted to evaluate the characteristics of pressure wave for the high-speed train entering the tunnel at high speed. The dynamic mesh method for 2D axisymmetric transient analysis is applied to simulate the dynamic motion of the high-speed train, and the initial motion using the smooth starting method is adopted to reduce the initial numerical pressure wave caused by the impulsive start. The complex pressure wave interaction between compressible wave and expansive wave occurs in the tunnel when the high-speed train enters the tunnel. Rapid pressure changes are caused by these pressure wave interactions, and have a serious effect on the aural comfort of passengers. The characteristics of pressure waves are estimated by the computational approach, and the resulting computational prediction meets the safety criterion of domestic trains and provides basic information for train design.
단일 스태거 PRI의 추정 및 능동 상쇄를 위한 예상 도착 시간 추정 기법
임성목(Seongmok Lim),심동규(Dongkyu Sim),이충용(Chungyong Lee) 대한전자공학회 2014 전자공학회논문지 Vol.51 No.3
스태거 펄스 반복 주기 (pulse repetition interval, PRI)로 구성된 위협 레이더 신호에 대하여 실시간으로 PRI transform을 적용하여 스태거 PRI를 분석하고 측정 TOA와 추정된 PRI를 이용하여 능동 상쇄에 필요한 미래의 TOA (time of arrival)를 계산한다. 또한, 추정된 PRI와 TOA에 포함되어 있는 오차의 영향을 살펴보고 추정 PRI의 정확도를 향상시키는 기법과 TOA 오차의 영향을 감소시키기 위하여 TOA 평균화 기법을 제안한다. 마지막으로 TDOA와 최근 TOA를 이용하여 단순하게 예측된 미래 TOA와 제안된 방법을 통해 예측된 미래 TOA 간의 RMSE (root mean square error)를 비교하여 제안된 기법의 예측 정확도가 높음을 보인다. Through applying hostile radar signals that use stagger PRI to PRI transform in real time, we can analyze stagger PRI and calculate the future TOA for active cancellation by using measured TOA and estimated PRI. We shows the effect of the errors that are contained in PRI and measured TOA. Then, it will suggest the technique to improve the accuracy of estimated PRI and the TOA averaging method for reducing the effect of measured TOA error. Finally, we will show that accuracy of estimated future TOA that is calculated by proposed scheme is higher than that of future TOA that is simply calculated with TDOA and newest TOA through comparing RMSE performance.
트리 구조로 구현한 수도권 전철 다중 경로 탐색 알고리즘
이성목(SeongMok Lee),정경창(KyungChang Jeong),오홍석(HongSeok OH),정재민(JaeMin Jeong),이의종(Euijong Lee) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.6
그래프 기반 경로 검색 알고리즘은 실제 세계에서 정류장이나 노선이 추가되면 그래프의 노드 및 링크 정보를 업데이트해야 하는 번거로움이 있었다. 본 논문에서는 이러한 변화에 신속하게 대처하기 위해 정류장 간 연결 정보와 운행 시간표 데이터를 이용한 트리 구조 다중 경로 검색 모델을 제안한다.
고대 일본의 여우 이미지와 신앙에 관하여 : 『니혼료이키日本霊異記』의 여우설화를 중심으로
홍성목(Hong seongmok, 洪聖牧) 한국외국어대학교 일본연구소 2015 日本硏究 Vol.0 No.66
This paper in the center of the narrative about the fox to tell the "Ryoiki", through the comparison and analysis of the fox image appearing on the various documents before and after the establishment "Ryoiki", in which an attempt is made to consider the faith and the image of the ancient Japanese fox is there. Fox that appears in the "Ryoiki" is, or change to a person to have a mysterious ability, such as possession, have a variety of images. And faith or customs on the fox hole was also present. In Japan, retail price literature was established to "Ryoiki" earlier, myths and lore almost no about the fox, is believed to have affected the continent, and the white fox of description as a symbol of good omen, fox cries of fortune it is only reportedly statement that represents the aura only. The history books that have been compiled by the court, it is early had been captured with the white fox and black fox the good omen of animal, fox image as the era go down just in nasty animals entering the Human habitat areas, hunted state in which it evolves to figure that is getting rid of are marked. However, considering the fox narrative of "Ryoiki", fox in the folklore could guess that has been recognized as the presence with a mysterious ability. Entered the Heian period, Inari God be respected from the court and the peasant, we would like is widely believed in Japan. In the spirit fox story to tell in "Inari Ryuki", you can see the process of fox and Inari faith is going to fusion. In addition, when the story of the my?bu shrine's fox hole to tell the Fushimi Inari shrine consider to fit the narrative of "Ryoiki", custom of people in any faith or purpose from before the Inari faith is satisfied visit the holes in the fox but it can be assumed to have existed. This is the image of the image and the continent legacy of the fox of Japan specific fox can be said that shows well the process to continue to fusion.
Computed tomographic anatomy of hepatic artery in normal beagle dogs
Kim, Soochan,Jeong, Seongmok,Lee, Heechun,Lee, Youngwon,Choi, Hojung The Korean Society of Veterinary Science 2019 大韓獸醫學會誌 Vol.59 No.2
This study was performed to examine the visualization and anatomical variants of the hepatic artery with dual-phase computed tomography (CT) angiography and three-dimensional volume rendering imaging analysis in clinically normal dogs. Seven healthy beagle dogs were enrolled and underwent dual CT angiography. Arterial phase images could be obtained with multi-detector CT angiography using the fixed-scan method in these dogs. Contrast enhancement of the hepatic parenchyma was quite minimal because of the unique blood supply system of the liver. In most dogs, the main hepatic arterial branches were the right lateral branch, left branch, and right medial branch. Although hepatic arterial variation appears to be common in dogs, only one dog in this study had the caudate lobar branch as the first branch of the hepatic artery. Further study on a larger number of dogs with CT images will be needed to identify and classify the pattern of hepatic arterial variations.