상용차 기반에 대한 주차보조시스템 사용자 감성 평가

전재석(Jaeseok Jeon),박현배(Hyunbae Park),문희석(Heeseok Moon),곽수진(Sujin Kwag) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5

In this paper, we described about evaluation of human sensibility using park assist system of the commercial vehicle. The perpendicular parking and parallel parking have been carried out as a user test and subjects are classified as beginning drivers, drivers with less than 1 year experience and over 3 years experience. As a result, parking duration of beginning drivers and drivers with less than 1 year experience who use automatic parking assistance system is similar to drivers with over 3 years experience. However error occurred according to sensor position and distance between vehicle and parking space. And also it occurred that the vehicle leaves from parking line or does not recognize the parking space. Therefore, if we improve its completeness by compensating problems that came up from this evaluation and distribute the automatic parking assistance system, it is expected that the park assistance system is to help driver providing convenience of parking.

치아교모에 영향을 미치는 요인에 관한 연구

박현배,한경수,진태호,Park, Hyun-Bae,Han, Kyung-Soo,Jin, Tai-Ho 대한치과보철학회 1999 대한치과보철학회지 Vol.37 No.3

This study was performed to investigate the factors related to tooth wear. For this study, 78 patients with temporomandibular disorders and 76 dental students without any signs and symptoms of temporomandibular disorders were selected as the patients group and as the normal group, respectively. Preferred chewing side, Angle's classification, lateral guidance pattern, head and shoulder posture were observed clinically. Electromyographic activity of anterior temporalis and masseter muscle were recorded with $BioEMG^{(R)}$ and occlusal status were recorded with $T-Scan^{(R)}$. Wear facet area of each tooth was measured from working model of upper arch corresponding to the occlusal status from T-Scan. Wear facet area were measured with planimeter in $mm^2$. Total area were divided into incisal, canine, posterior tooth area. Anterior wearfacet area was incisor area plus canine area, and unilateral area was anterior area plus posterior area. The data collected were analyzed by SAS statistical program and the results of this study were as follows: 1. There was no significant difference between the two groups in total werafacet area, and male subjects showed tendency to have larger area in the normal group but female subjects showed tendency vice versa. 2. There was no significant difference related to preferred chewing side and Angle's classification, however some difference was observed by lateral guidance pattern. Anterior wear facet area in subjects of canine guidance was the largest in the three subgroups. 3. Subjects with head tilting to right side had larger posterior and total area, and subjects with higher shoulder in right side had larger canine and anterior area than any other subgrous. 4. Electromyographic activity of masseter muscle was more correlated with wear facet area than anterior temporalis muscle, and tooth contact number and force were significantly correlated with wear facet area, but the most important factor affecting tooth attrition was age.

CAN 메시지 조작 방법 분석 및 대응방안

박현배(Hyun Bae Park),김용은(Young Eun Kim),전재석(Jae Seok Jeon),우사무엘(Samuel Woo),문희석(Hee Seok Moon) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6

Recently, the security for communication of automotive is become an issue due to hacking. In case of CAN communication used as a control signal of a vehicle, a single twisted wire is used for communication, which makes it easy to access for hacking. Also, because of using the ‘recessive’ and ‘dominant’ logic, it is possible to attack the bus using these CAN communication characteristics. Recently, a method to manipulate a specific control field to cause a bus off error has been reported in the paper. In this paper, we describe how fully manipulated data can be received at Receiver(ECU) and we propose a method to prevent manipulation by changing the end of frame filed.

Bypass를 적용한 One-shot 방식 Multicast ATM Switch의 성능 분석

박현배(Hyun Bae Park),이성창(Sungchang Lee) 대한전자공학회 1996 대한전자공학회 학술대회 Vol.1996 No.11

자여자 유도발전기용 전압제어기 구현

박현배(Hyun Bae Park),김용은(Yongeun Kim),조현종(Hyun-Jong Cho),문희석(Hee Seok Moon) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5

Induction generator requires an excitation current to generate a rotating magnetic field by magnetize the iron core. Self-Excited generator is consist of inductor and capacitor. It is cheaper and maintenance is easier, so it has been applied to wind power. Self-Excited generator utilizes the principles of mutual resonance inductor and the capacitor so it generates a high voltage and greater the heat in the rotor. Therefore Power of Self-Excited generator should be controled by voltage control. In this paper, We implemented Controller of Resonant voltage and we verified the controller operating performance by motor dynamo.

광산 채굴적으로 인한 지반침하 조사 및 해석 사례

박현배 ( Hyun-bae Park ),문성우 ( Seong-woo Moon ),주세정 ( Sejeong Ju ),이정음 ( Jeungeum Lee ),서용석 ( Yong-seok Seo ) 대한지질공학회 2024 지질공학 Vol.34 No.1

우리나라는 1980년까지 광물 지하자원 개발을 활발히 수행하였으나 이후 생산원가 대비 사업성이 크게 줄어들면서 많은 수의 폐광산이 발생되었다. 그 중 대부분은 광산개발 중단 후 오랜 시간이 지나 잔류성 침하가 발생할 가능성이 높은 상태에 있다. 하지만 그 발생 시기와 위치를 정확히 예측하기는 어려움이 있다. 따라서, 본 연구에서는 실제 지반침하가 발생한 사례를 분석하여 연속체 수치해석을 통해 지반침하의 발생 위치나 규모에 대한 예측 가능성을 살펴보고자 한다. 연구지역은 양산단층과 모량단층 사이에 위치하여 이들에 규제받는 ○○광산 지역이며, 이 지역에서는 2005~2009년에 걸쳐 3회의 지반침하가 발생된 바 있다. 지반침하지를 대상으로 시추조사 및 전기비저항 탐사를 수행하여 지층의 분포를 파악하였고, 실내시험을 통해 수치해석 시 적용되는 지반의 물리 · 역학적 특성을 파악하였다. 수치해석 결과 소성영역이 실제 지반침하 범위를 포함하는 형태로 나타나 연속체 해석으로도 채굴적에 의한 침하지 발생 위치 및 규모를 예측하는데 활용할 수 있을 것으로 판단된다. South Korea’s mining industry was actively developed until 1980, but subsequent declining profitability forced many mines to close. Most of the abandoned mines are susceptible to persistent subsidence because of the length of time since mining ceased. Accurate prediction of the locations and times of subsidence is difficult; therefore, this study aims to apply continuum analysis to past cases of subsidence to establish a method of predicting the location and magnitude of future subsidence. The study area is an area of ○○ mining located between the Yangsan fault zone and the Moryang fault zone, in which three subsidence events occurred between 2005 and 2009. Drilling surveys and electrical resistivity surveys were performed at subsidence sites determined the distribution of strata, and through laboratory tests obtained the physico-mechanical properties of the rock. Numerical analysis of the results found that the plastic status area includes the areas of actual subsidence and that continuum analysis can also be used to predict the location and magnitude of subsidence caused by mine goaf.

THE IMPACT OF NONLINEAR STRUCTURE FORMATION ON THE POWER SPECTRUM OF TRANSVERSE MOMENTUM FLUCTUATIONS AND THE KINETIC SUNYAEV-ZEL’DOVICH EFFECT

Park (박현배), Hyunbae,Komatsu, Eiichiro,Shapiro, Paul R.,Koda, Jun,Mao, Yi American Astronomical Society 2016 The Astrophysical journal Vol.818 No.1

<P>Cosmological transverse momentum fields, whose directions are perpendicular to Fourier wave vectors, induce temperature anisotropies in the cosmic microwave background via the kinetic Sunyaev-Zel'dovich (kSZ) effect. The transverse momentum power spectrum contains the four-point function of density and velocity fields, <delta delta nu nu >. In the post-reionization epoch, nonlinear effects dominate in the power spectrum. We use perturbation theory and cosmological N-body simulations to calculate this nonlinearity. We derive the next-to-leading order expression for the power spectrum with a particular emphasis on the connected term that has been ignored in the literature. While the contribution from the connected term on small scales (k > 0.1 h Mpc(-1)) is subdominant relative to the unconnected term, we find that its contribution to the kSZ power spectrum at l = 3000 at z < 6 can be as large as ten percent of the unconnected term, which would reduce the allowed contribution from the reionization epoch (z > 6) by twenty percent. The power spectrum of transverse momentum on large scales is expected to scale as k(2) as a consequence of momentum conservation. We show that both the leading and the next-to-leading order terms satisfy this scaling. In particular, we find that both of the unconnected and connected terms are necessary to reproduce k(2).</P>

자전거 교통사고 특징 및 피해 심각도 모형 연구

박현배 ( Park Hyun-bae ) 한국도로교통공단 2017 교통안전연구 Vol.36 No.-

국내 교통사고 발생 최근 자전거 교통사고의 증가로 자전거 교통사고 피해를 줄이기 위한 안전운전 방법과 대책의 제시가 시급한 실정이다. 그래서 25년간의 자전거 교통사고를 분석하고 ‘자전거 교통사고 피해 심각도’에 영향을 미치는 요인을 분석하였다. 자전거 교통사고를 분석한 결과 첫 번째, 최근 10년간 자전거(가해차) 교통사고 사망자수는 63.8% 급증하였다. 두 번째, 전체 교통사고에서 차지하는 자전거(가해차) 교통사고의 구성비는 최근 10년 동안 사망자수가 2.35배 증가하였다. 세 번째, 자전거(가해차) 운전자의 위반은 횡단 및 진로방향 변경 종류의 위반이 많았다. ‘자전거 교통사고 피해 심각도’를 로지스틱 회귀분석한 결과, 자전거(전체) 교통사고에서는 ‘자전거 단독사고’, 자전거 운전자 연령이 ‘65세 이상’, ‘이상기후’ 시, ‘중과실 위반’, ‘승합차등’과 사고발생 시, 자전거 운전자 ‘연령’의 순으로 교통사고 피해 심각도에 영향을 미치는 것으로 분석되었다. 또 자전거(가해차) 교통사고에서는 ‘자전거 단독사고’와 자전거 운전자 연령이 ‘65세 이상’인 경우의 순으로 교통사고의 피해가 심각해짐을 확인하였다. The rapid growth of bicycle usage has caused an increase of bicycle accidents. To reduce accident caused by bicycles, there safe driving measures and solutions should be proposed and implemented. This paper investigated the factors which influence 'bicycle accident injury severity' and analyzed bicycle accidents over the last 25 years. The analysis on bicycle accidents revealed the following results. Firstly, the number of mortalities from bicycle accident (offenders) has shown a significant increase of 63.8% over the last 10 years. Secondly, the mortality ratio of bicycle accidents as a proportion of total traffic accidents has increased by 2.35 times over the last 10 years. Thirdly, bicycle drivers (offenders) have violated traffic rules; mostly in traversing and changing direction. The result of the logistic regression analysis on 'bicycle accident injury severity' shows that factors from 'sole bicycle accidents', 'bicycle drivers over 65', 'abnormal weather' and accidents from 'gross negligence', 'shuttle vans' and bicycle drivers age affecting the severity of accidents. In addition to this, the damage is becomes even more severe in the case of 'sole bicycle accidents' and 'bicycle drivers over 65'

Madymo(HybridII) / Muti-Body의 매칭을 통한 탑승자 거동 경향 분석 모델 제안

박현배(Hyunbae Park),전재석(Jaeseok Jeon),문희석(Heeseok Moon),곽수진(Sujin Kwag) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5

Prior to the development of a system that considers the safety of the occupant, research of the behavior of the occupant state is necessary. In addition, the information about the occupant body type, the type of the vehicle and its condition is also important. It is necessary to study the behavior of the state of the occupant in an environment where the internal structure of the vehicle is taken into account. In this paper, a multi-body model for analysis of the occupants in various environment is suggested. It is based on Madymo (HybridII) and the modeling is done by matching the value of the result. Error for the match is ± 1.5cm. Suggested model can be used to analyse the occupant for variety of environments. The new model can be applied through the matching of the result value.

전략적 자원이 성과측정치와 기업성과에 미치는 영향

박기석 ( Gi Seok Park ),최수천 ( Soo Cheon Choi ),박현배 ( Hyun Bae Park ) 韓國稅務會計學會 2008 세무회계연구 Vol.22 No.-