배경 분리 알고리즘 기반 이동 객체 탐지 성능 평가 기법 연구

호씬 엠디 알람깃,호씬 엠디 임티아즈,호씬 엠디 딜로와르,이가원,허의남 한국정보과학회 2020 정보과학회 컴퓨팅의 실제 논문지 Vol.26 No.10

The background subtraction technique finds moving objects and reconstructs the background from video sequences. The background subtraction has extensive real-world applications. Most of the background subtraction studies have focused on increasing the accuracy while reducing the complexity. Though few studies have appraised the accuracy of the background subtraction methods, the researchers have not measured the computational complexity of the methods. Thus, in this study, our main goal was to measure the accuracy and computational complexity of the background subtraction approaches. This study can be used in industry and academy. Also, we implemented and assessed the performance of the three different types of background subtraction algorithms such as the cluster-based method, the statistical-based method, and the sample consensusbased method. We mainly used the F-measure with other confusion metrics, which are the most accepted criteria to assess the segmentation accuracy of the background subtraction algorithms. Also, we evaluated the complexity in terms of the memory usage per pixel and the number of frame display per second for the CDD-2012, CDD-2014, and Carnegie Mellon datasets. The experimental data are presented in the table in Section 4 to show the accuracy and computational complexity. 배경 분리 알고리즘은 비디오 시퀀스에서 배경을 재구성하여 움직이는 객체를 찾아내기 위한 기술로, 광범위한 응용 분야에 활용되고 있다. 배경 분리 알고리즘의 연구는 주로 복잡도를 줄이면서 정확성을 높이는 데 중점을 두고 있으나, 복잡도를 측정하거나 정확도를 평가하는 방법에 대한 연구는 상대적으로 미비한 상태이다. 따라서, 본 연구에서는 산업 및 학술적으로 모두 사용 가능한 배경 분리 알고리즘의 정확도와 계산 복잡도 평가 방안을 제시하고자 한다. 본 논문에서는 클러스터 기반 기법, 통계 기반 기법, 표본 합의 기반 기법의 세가지 종류와 배경 분리 알고리즘을 구현하고 평가한다. 특히 배경 분리 알고리즘의 분할 정확도를 평가하는데 가장 적합한 방법인 F-measure를 다른 혼합 지표와 함께 사용하였으며, CDD-2012, CDD-2014, 카네기멜론의 데이터시트를 픽셀당 메모리 사용량, 초당 프레임 수로 복잡도를 평가하여 정확도와 계산 복잡도를 나타낸 실험 결과를 본문(섹션 4)에 제시하였다.

論禪宗典籍中 “勿” 的 “沒有” 義用法

胡靜書(호정서) 한국교통대학교 동아시아연구소 2014 동아문헌연구 Vol.- No.-

Catalytic hydrodeoxygenation of simulated phenolic bio-oil to cycloalkanes and aromatic hydrocarbons over bifunctional metal/acid catalysts of Ni/HBeta, Fe/HBeta and NiFe/Hbeta

호다,Pouya Sirous Rezaei,Wan Mohd Ashri Wan Daud 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-

Bifunctional metal/acid catalysts of 5 wt% Ni/HBeta, 5 wt% Fe/HBeta, 2.5 wt% Ni-2.5 wt% Fe/HBeta (NiFe-5/HBeta) and 5 wt% Ni-5 wt% Fe/HBeta (NiFe-10/HBeta) were used for hydrodeoxygenation (HDO) of asimulated phenolic bio-oil consisting of phenol (50 wt%), o-cresol (25 wt%) and guaiacol (25 wt%). Nickeland iron metals were supported on hydrogen form Beta zeolite (HBeta) under similar ion-exchangeconditions. BET surface area and acid sites density of Ni/HBeta, Fe/HBeta, NiFe-5/HBeta and NiFe-10/HBeta were 463, 445, 455, 417 m2/g and 0.53, 0.48, 0.50, 0.38 mmol/g, respectively. Cycloalkanes(21.39 wt%) and aromatic hydrocarbons (20.21 wt%) were the dominant hydrocarbons obtained overmonometallic catalysts of Ni/HBeta and Fe/HBeta through reactions of hydrogenation and hydro-genolysis, respectively. It was revealed that both hydrogenation and hydrogenolysis mechanisms wereeffectively proceeded over the bimetallic catalyst of NiFe/HBeta which showed enhanced HDO efficiencycompared to monometallic catalysts of Ni/HBeta and Fe/HBeta due to the synergistic effect between thetwo metals. The effect of reaction temperature on HDO efficiency of NiFe-10/HBeta catalyst wasinvestigated at 220, 260, 300 and 340 8C. Maximum catalytic activity and hydrocarbons selectivity wasobserved at 300 8C. Replacement of water with methanol as solvent in HDO of the simulated phenolicbio-oil over NiFe-10/HBeta remarkably reduced the selectivity towards hydrocarbons.

In-situ catalytic pyrolysis of lignin in a bench-scale fixed bed pyrolyzer

호다,Pouya Sirous Rezaei,노동훈,제정호,김범식,정상철,성봉현,박영권 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-

Thermal and in-situ catalytic pyrolysis of lignin were carried out in a bench-scale pyrolyzer. The yield and composition of the bio-oil produced were influenced largely by the type of lignin samples, pyrolysis temperature, and nitrogen carrier gas flow rate. The highest bio-oil yield of 35.95 wt.% was achieved using kraft lignin at 500 C and a carrier gas flow rate of 600 ml/min. In-situ catalytic pyrolysis resulted in a decrease of the bio-oil yield, but the aromatic product distribution was altered greatly depending on the types of catalysts. In-situ catalytic pyrolysis also showed enhanced selectivity to valuable aromatic hydrocarbons.

宋代 이후 徽州 宗族의 확장과 영향

호중생(胡中生) 한국국학진흥원 2005 안동학연구 Vol.4 No.-

종문화사각도간위진남북조수당시대(從文化史角度看魏晉南北朝隋唐時代)

호극(胡戟) 한국중국학회 1998 중국학보 Vol.38 No.1

‘전족의’와 ‘식쟁송’을 통한 종족 내의 분규 해결

호중생(胡中生),정의우(번역자) 한국국학진흥원 2008 안동학연구 Vol.7 No.-

틀 의미론에 기반한 문학번역의 어휘 번역 방법 연구 - <채식주의자>를 중심으로 -

호가 국제한국언어문화학회 2022 국제한국언어문화학회 학술대회 Vol.2022 No.11

베이비부머의 희망 은퇴 연령 분석: 미래 시간 관점과 직무 몰입을 중심으로

호정화(Ho, Jeong-Hwa) 한국인구학회 2020 한국인구학 Vol.43 No.3

미래 시간의 길이와 성격에 대한 예상은 삶의 방향과 우선순위 결정을 위한 생각의 틀을 제공한다. 산업사회에서 은퇴는 노년기의 시작점을 의미하며, 중년기 근로자는 은퇴 시기에 대한 희망을 형성하며 노년기를 준비한다. 본 연구는 취업 중인 50대 베이비부머를 대상으로 미래 시간 관점(주관적 기대여명과 노화 불안)과 희망 은퇴 연령의 관계를 살펴보았다. 또한 이 관계가 직무 몰입에 따라 어떠한 차이를 보이는지 분석하였다. 분석 결과 주관적 기대여명이 길수록 남성과 여성 모두 늦은 은퇴를 희망하는 것으로 나타났다. 즉 앞으로 남아 있는 시간이 길다고 예측하는 경우, 은퇴의 시점을 늦추기를 원하였다. 남성의 경우 노화 불안이 높을수록 늦은 은퇴를 희망하여, 미래 시간의 길이뿐만 아니라 그 성격에 대한 예측 역시 희망 은퇴 연령 형성에 중요한 요인임을 제시하였다. 여성의 경우 직무 몰입이 높을수록 주관적 기대여명과 희망 은퇴 연령의 관계는 더욱 강하게 나타났다. 본 연구는 수명 증가와 인구 고령화를 배경으로 미래 시간 관점과 현재의 직무 몰입이 희망 은퇴 연령의 형성에 기여하는 역할을 밝히며, 은퇴 관련 변인의 시간적 차원을 미래로 확장하였다는 의의를 지닌다. Perspectives on the length and quality of future time provide references to evaluate priorities of life choices. This study examined associations between future time perspective (i.e. subjective life expectancy and aging anxiety) and hoped retirement age and the moderating effect of job involvement for Korean baby boomers in their 50s. Results suggested that the subjective life expectancy was positively related to hope for later retirement. Both men and women who expected to live longer hoped to retire at later ages. For men, aging anxiety was positively related to hope for later retirement. The association between subjective life expectancy and hoped retirement age was stronger for women with greater job involvement. This study raised the importance of future time perspective on retirement expectations in the context of population aging.

Novel Intensity-Based Fiber Optic Vibration Sensor Using Mass-Spring Structure

호일,김현호,최상진,반재경 대한전자공학회 2014 전자공학회논문지 Vol.51 No.6

In this paper, a novel intensity-based fiber optic vibration sensor using a mass-spring structure, which consists of four serpentine flexure springs and a rectangular aperture within a proof mass, is proposed and its feasibility test is given by the simulation and experiment. An optical collimator is used to broaden the beam which is modulated by the displacement of the rectangular aperture within the proof mass. The proposed fiber optic vibration sensor has been analyzed and designed in terms of the optical and mechanical parts. A mechanical structure has been designed using theoretical analysis, mathematical modeling, and 3D FEM (Finite Element Method) simulation. The relative aperture displacement according to the base vibration is given using FEM simulation, while the output beam power according to the relative displacement is measured by experiment. The simulated sensor sensitivity of 15.731 μW/G and detection range of ±6.087 G are given. By using reference signal, the output signal with 0.75% relative error shows a good stability. The proposed vibration sensor structure has the advantages of a simple structure, low cost, and multi-point sensing characteristic. It also has the potential to be made by MEMS (Micro-Electro-Mechanical System) technology.