확률적 모수를 고려한 음이항모형에 의한 교통사고와 기하구조와의 관계 - 미국 워싱턴 주(州) 고속도로를 중심으로

박민호,Park, Minho 대한토목학회 2013 대한토목학회논문집 Vol.33 No.6

이 연구는 확률적 모수를 고려한 음이항회귀분석을 이용하여 고속도로에서의 사고와 기하구조와의 관계를 파악하는데 목적이 있다. 고속도로에서의 기하구조는 모든 구간에 동일한 설계요소가 적용되기에는 현실적으로 불가능함에도 불구하고, 지금까지의 연구에서는 모형을 통해 도출되는 계수값이 구간에 설치된 기하구조의 특성에 관계없이 항상 고정된 값으로 추정되어왔다. 고정된 값을 이용한 일반적인 음이항모형은 시간적 변화 또는 각 대상구간이 가지고 있는 고유한 특성에 따른 변화를 통합하여 설명하지 못한다는 단점이 있으며, 이로 인해 추정된 계수의 표준오차가 과소추정되어 t-값이 부풀려지게 되며, 그 결과 모형의 설명력이 떨어지게 된다. 따라서, 이 연구에서는 워싱턴 주에 위치하고 있는 7개의 고속도로에서 발생한 9년동안의 사고자료 및 기하구조자료를 이용하여 구간별로 상이한 기하구조가 사고에 미치는 영향을 알아보고자 한다. 총 16개의 기하구조 관련 변수가 모형 도출에 이용되었으며, 기존의 음이항모형과의 비교를 통해 이 연구에서 제시하는 모형이 교통사고와 기하구조와의 관계파악에 더욱 적합함을 보이고자 한다. 그리고, 각 변수의 한계효용 및 탄력성 분석을 통해 이질성을 가지는 기하구조가 사고에 미치는 영향을 제시하고자 한다. 이는 향후 기하구조 관련 정책수립에 도움이 될 것으로 판단된다. The objective of this study is finding the relationship between interstate highway accident frequencies and geometrics using Random Parameter Negative Binomial model. Even though it is impossible to take account of the same design criteria to the all segments or corridors on the road in reality, previous research estimated the fixed value of coefficients without considering each segment's characteristic. The drawback of the traditional negative binomial is not to explain the integrated variations in terms of time and the distinct characters specific segment has. This results in under-estimation of the standard error which inflates the t-value and finally, affects the modeling estimation. Therefore, this study tries to find the relationship of accident frequencies with the heterogeneous geometrics using 9-years and 7-interstate highway data in Washington State area. 16-types of geometrics are used to derive the model which is compared with the traditional negative binomial Model to understand which Model is more suitable. In addition, by calculating marginal effect and elasticity, heterogeneous variables' effect to the accidents are estimated. Hopefully, this study will help to estiblish the future policy of geometrics.

Random Parameter를 이용한 4지 신호교차로에서의 교통사고 예측모형 개발 : 부산광역시를 대상으로

박민호,이동민,윤천주,김영록,Park, Minho,Lee, Dongmin,Yoon, Chunjoo,Kim, Young Rok 한국도로학회 2015 한국도로학회논문집 Vol.17 No.6

PURPOSES : This study tries to develop the accident models of 4-legged signalized intersections in Busan Metropolitan city with random parameter in count model to understanding the factors mainly influencing on accident frequencies. METHODS : To develop the traffic accidents modeling, this study uses RP(random parameter) negative binomial model which enables to take account of heterogeneity in data. By using RP model, each intersection's specific geometry characteristics were considered. RESULTS : By comparing the both FP(fixed parameter) and RP modeling, it was confirmed the RP model has a little higher explanation power than the FP model. Out of 17 statistically significant variables, 4 variables including traffic volumes on minor roads, pedestrian crossing on major roads, and distance of pedestrian crossing on major/minor roads are derived as having random parameters. In addition, the marginal effect and elasticity of variables are analyzed to understand the variables'impact on the likelihood of accident occurrences. CONCLUSIONS : This study shows that the uses of RP is better fitted to the accident data since each observations'specific characteristics could be considered. Thus, the methods which could consider the heterogeneity of data is recommended to analyze the relationship between accidents and affecting factors(for example, traffic safety facilities or geometrics in signalized 4-legged intersections).

전기중합법에 의한 열가소성 수지 탄소섬유 강화 복합재료의 제조와 내방사선성

박민호,김민영,김원호,조원제 ( Minho Park,Minyoung Kim,Wonho Kim,Wonjei Cho ) 한국공업화학회 1997 공업화학 Vol.8 No.3

일정한 전류하에서 내방사선성이 우수한 2-vinylnaphthalone(2-VN)과 methylmethacrylene(MMA)의 전기중합을 탄소섬유 표면 위에서 실시하였다. 단량체의 용해도 증대를 위해 N,N-dimethylformamide(DMF)를 용매로 사용하고, 질산나트륨를 전해질로 하여 전기중합을 실시하였다. 탄소섬유-2VN/MMA의 프리프레그 제조는 1:1 비율의 공단량체 용액 조성하에서 실시 되었다. 본 전기중합 실험에서는 전류 밀도, 공단량체 농도, 전해질 농도와 반응시간에 따라 탄소섬유 표면에서 얻어지는 수율을 열중량분석기 (TGA)로 측정하였다. 600∼800mA/g 전류밀도에서 50wt%의 최대 수율을 얻을 수 있었으며, 800mA/g 이상에서는 수율이 급격히 감소하였다. 농도에 따라 수율이 증가하였지만 전해질 농도에는 영향이 없었다. 초기반응시간 약 30분 동안에 20wt%의 빠른 수율증가가 관찰되었다. 최대 수율을 얻을 수 있는 최적 조건하에서 제조된 프리프레그를 이용하여 탄소섬유 복합재료를 제조하였으며 ^(60)Co γ-ray 조사 전후의 표면형태학적 변화를 통해 내방사선성을 조사하였다. Electropolymerization of 2-vinylnaphthalene (2-VN) and methylmethacrylate (MMA) with high radiation resistance property was conducted on the surfaces of carbon fibers by using a nonaqueous solution of comonomers dissolved in N,N-dimethylformamide containing sodium nitrate as a supporting electrolyte. The fabrication of carbon fiber / 2-VN / MMA prepreg was performed electrochemically in 1:1 comonomer solution. Electropolymerization was conduced by changing the current density, initial comonomer concentration, and reaction time. The weight gain on the surface of the carbon fibers was measured by thermogravimetric analyzer (TGA). The highest weight gain of 50 wt% was obtained at 600 mA/g ∼800 mA/g current density range, but the weight gain was rapidly decreased above 800 mA/g current density. The weight gain was increased with the concentration of comonomer, while the concentration of electrolyte had almost no effect on the weight gain. At 300 mA/g current density, weight gain rate was increased abruptly to the initial 30 minutes of reaction time. After that the rate was decreased due to the generation of gas bubbles. In order to check the effect of coated polymers on the radiation resistance, morphology changes before and after γ-ray irradiation was investigated for the composites.

무선 IP 네트워크에서 전용선 모뎀 사용가능성 검증

박민호,백해현,금동원,최형석,이종성,PARK, MINHO,Baek, Hae Hyeon,Kum, Dong Won,Choi, Hyungseok,Lee, Jong Sung 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.4

A leased line modem usability was evaluated and investigated in the wireless internet protocol(IP) network. The signal of the modem in the circuit switching network was translated to IP packet by using several voice codecs (PCM, G.711A, $G.711{\mu}$, and etc.) and transmitted through the wireless IP network. The wireless IP network was simulated by the Tactical information and communication network Modeling and simulation Software(TMS). The performance and usability of the leased line modem are simulated using the system-in-the-loop(SITL) function of TMS with respect to packet delay, jitter, packet discard ratio, codecs, and wireless link BER.

서울시 역세권 청년주택 사업 적지평가 모형: 5차 운영기준 개정과 청년수요의 반영을 중심으로

박민호,김명훈,천상현,Park, MinHo,Kim, MyoungHoon,Cheon, SangHyun 한국토지주택공사 토지주택연구원 2020 LHI journal of land, housing, and urban affairs Vol.11 No.3

The Seoul's 2030 Youth-Housing is a policy to promote the development of private sector-built rental housing in a Station Influence Area (SIA). It is a representative policy to resolve a housing problem for the youth in Seoul. The Seoul Metropolitan Government has made continuous policy improvements to respond to earlier criticisms on the policy. In December 2018, the Seoul Metropolitan Government enlarged the possible spatial boundaries of the SIA that the private sector developer can carry out the housing development projects. This study attempts to assess the potential sites available in Seoul by considering the youth's demand. This study used the suitability modelling technique to evaluate the potential sites. In detail, we established three sub-models by reflecting rent, accessibility to living areas of the youth, and accessibility to living SOC for the youth's demand. According to the results, the Hanyang City Wall area, which was newly included by the recent policy revision, showed moderate scores to fit the housing projects, while some Gangbuk areas, which have high accessibility and relatively lower rents, showed the best scores appropriate for the projects. The age group of 20s preferred university districts, while the age group of 30s preferred to locate near Seoul's main office areas. We suggest that the Seoul metropolitan government develops better ways to guage and reflect the demand for differing youth groups and the demand by age groups.

극배치 특성을 갖는 LQR 제어기 설계

박민호(Minho Park),박문수(Mun-Soo Park),박덕기(Duckgee Park),홍석교(Suk-Kyo Hong),이상혁(Sang-Hyuk Lee) 제어로봇시스템학회 2007 제어·로봇·시스템학회 논문지 Vol.13 No.6

회전형 도립진자의 스윙업과 LQR 제어

박민호(Minho Park),이주장(Ju-Jang Lee) 제어로봇시스템학회 2010 제어로봇시스템학회 각 지부별 자료집 Vol.2010 No.12

LQ 제어기에 의한 극배치 방법

박민호(Minho Park) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.3

This paper studies the problem of pole placement by an LQ controller for system having two distinct real poles. Using the so-called Pole’s Moving Range (PMR) drawn in the s-plane and relational equations between closed-loop system poles and weighting matrices, we calculate the state weighting matrix to move two distinct real poles to a pair of complex poles. By numerical examples, we show that the proposed method is applied to improve system performance.

볼 스터드의 고주파 열처리에 관한 연구

박민호(Minho Park),김성원(Sungwon Kim),김국용(Gugyong Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-

미국 대중음악에 나타난 흑인 민권 운동 요소에 관한 고찰

박민호(Minho Park),홍성규(Seonggyu Hong) 한국문화융합학회 2023 문화와 융합 Vol.45 No.10

본 연구의 목적은 1960년대 미국 대중음악에 나타난 흑인 민권 운동 요소를 고찰하는 것이다. 따라서대중음악과 흑인 민권 운동의 이해를 돕기 위해 전반적인 흐름을 살펴보고 이를 통해 관찰한 흑인 민권 운동 요소가 대중음악 작품에서 어떠한 형태로 나타나는지 사회적 배경과 가사 분석을 통해 관찰해보았다. 대중음악에 나타난 흑인 민권 운동 요소로는 인종차별 폐지와 평등 요구, 제도적 변화 요구, 정체성 및 결정권 강화, 협력과 연대라는 네 가지 요소로 특정 지을 수 있었고 이러한 요소는 대중음악과 흑인 민권 운동의 관계성을 입증하고 시대적 배경과 시민 의식을 대변하는 수단으로 사용되는 대중음악의 특징을 입증하는 기초자료로 제공하고자 한다. The purpose of this study is to examine the elements of the black civil rights movement in American popular music in the 1960s. Therefore, in order to help understand popular music and the black civil rights movement, the overall flow was examined, and the form of the black civil rights movement observed through this was observed through social background and lyrics analysis. The elements of the black civil rights movement in popular music were identified as four elements: abolition of racism and equality, demand for institutional change, identity and decision-making, cooperation and solidarity, and these elements are provided as basic data to prove the characteristics of popular music used as a means of the times and civic consciousness.