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.

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.

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.

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'

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

재 사용된 IPS-empress ingot의 pressing accuracy에 관한 연구

송병권,박현배,오상천,진태호,Song, Byung-Kwen,Park, Hyun-Bae,Oh, Sang-Chun,Jin, Tae-Ho 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.2

IPS-empress system is one of widely used all ceramic system. The purpose of this study was to determine the pressing accuracy of reused IPS%Empress ingot. 10 specimens were made using new ingot first, and using the rests of the specimen the another group of specimens were made next. finally, the third group of specimens were made with same procedure mentioned above. The results obtained in this study were as follows ; 1. The pressing accuracy of the first group of specimen was 96.1%, that of the second group was 95.4%, and that of the third group was 95.4%. There was no statistical significance among them, that is, the reuse of the IPS-Empress ingot did not influence on the pressing accuracy. 2. the common site of the defect in pressed ingot was central area at the margin opposite of sprue hole.

합성 물질의 종류 및 몰비 변화에 따른 LiMn2O4 의 전기화학적 특성

최형기,박현배,정인성,구할본 ( Hyung Ki Choi,Hyun Bae Park,In Seong Jeong,Hal Bon Gu ) 한국전기전자재료학회 1997 한국전기전자재료학회 추계학술대회논문집 Vol.1997 No.1

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.-

자여자 유도발전기 전압제어기와 전력회수장치의 협조제어 방법

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

Self-Excited Induction Generator is the power generated by the LC resonance and can control the braking torque through the control voltage. If the state of the battery is not fully charged electric power is charged to the battery. If the battery is fully charged, electric power discharge through the resistor. Therefore, charger and voltage controller should be controlled by the case. In this paper, we proposed efficient method of assist control method of voltage controller and charger and we verified through testing.