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박재홍(JaeHong Park),이상대(SangDae Lee) 한국지역개발학회 2000 韓國地域開發學會誌 Vol.12 No.1
1994년도에 `도농통합 형태의 시설치에 관한 법`이 통과된 이후, 당해 통합지역에 도시기본계획이 수립되는 등 체계적인 계획을 유도하려는 노력은 일부 시도되어 왔다. 그러나, 단순히 행정적 효율성의 유지라는 차원의 도농통합이 법의 원래 취지였기에 도시계획적 차원에서 그 전체 지역을 하나의 계획의 틀 속에 포함시키지 못하였고 그 결과, 오늘날 도시주변의 난개발 문제를 야기시키는 또 하나의 단초를 제공하기도 하였다. 이러한 문제점을 극복하기 위하여, 본 연구에서는 우리나라 도농통합시에 있어서의 효율적 토지 이용을 수립하기 위한 도시계획 방안을 제시하는데 그 목적을 둔다. 연구결과, 도농통합시의 경우, 단기적으로는 도농통합된 행정구역에 한하여는 별도의 도시기본계획을 수립함이 바람직한 것으로 나타났다. 또한, 중장기적으로는 우리나라 전국을 대상으로 하는 도시 및 농촌계획을 수립함이 타당한 것으로 판단되어진다.
베어링강의 경도에 따른 DLC박막의 트라이볼로지적 특성
박재홍(JaeHong Park),YoungGoo Jung,김석삼(SeockSam Kim) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
DLC (Diamond Like Carbon) films have predominant mechanical properties like a high hardness, low friction and high chemical resistance; therefore, DLC films are applied in a wide range of industry fields. Especially, we tribologically evaluated characteristics of DLC films deposited on bearing steel that is generally applied to mechanical parts such as Automobile and shipping building etc. We studied on the DLC films deposited on bearing steel (bearing steel) having different hardness. DLC films are deposited on bearing steel having different hardness by RF-PECVD (Radio Frequency - Plasma Enhanced Chemical Vapor Deposition) method. As interlayer, Si-interlayer is deposited on bearing steel to improve adhesion strength by RF -Sputtering method. The DLC film structures were analyzed with Raman spectra and evaluated to Gaussian function. And also, adhesion strength of DLC films was measured with a Scratch tester and we performed wear test with a Tribo-meter to measure coefficient of friction. As a result, DLC films deposited on bearing steel under same deposition condition have typical structure DLC films regardless of hardness of bearing steel. Adhesion strength of DLC film deposited on bearing steel is increased with a hardness of bearing steel. Friction coefficient of DLC film showed lower at the high hardness of bearing steel.
인공신경망을 활용한 10 mN급 홀추력기 성능 예측 연구
박재홍(Jaehong Park),도근태(Guentae Doh),이동호(Dongho Lee),김영호(Youngho Kim),최원호(Wonho Choe) 한국추진공학회 2021 한국추진공학회 학술대회논문집 Vol.2021 No.5
본 연구에서는 인공신경망을 이용하여 홀 전기추력기의 추력 및 방전전류 예측 모델링을 수행하였다. 학습데이터는 일차원 하이브리드 파티클-인-셀 기법을 통해 생성되었다. 학습된 인공신경망은 검증을 위한 10 mN급 홀추력기를 대상으로 수행한 전산모사 결과들과 동일하게 0.9999 값의 R-squared를 보여주며 성공적으로 결과 예측의 가능성을 보여 주었다. 특히 제논 양극유량 0.98 mg/s 및 양극전압 250 V조건에서 인공신경망은 10 mN급 홀추력기의 방전전류 및 추력을 각각 0.83 A 및 12.7 mN으로 측정값 대비 5% 이내의 정확도로 성능을 예측했다. A neural network is applied to predict thrusts and discharge currents of Hall thrusters. The training set was generated by the one-dimensional hybrid Particle-In-Cell method. The trained network effectively generalized numerical simulation results by showing that both training and test set had an R-squared of 0.9999, where the test set was a 10 mN class Hall thruster. At the 0.98 mg/s of Xe anode flow rate and 250 V of anode voltage, the network predicted the discharge current and thrust of 10 mN class Hall thruster as 0.83 A and 12.7 mN respectively, which was within 5% of accuracy with measured values.
탑승자 안전도를 고려한 교각 방호시설물 개발에 관한 연구
박재홍 ( Jaehong Park ),성정곤 ( Jung Gon Sung ),남민균 ( Min Gyun Nam ),윤덕근 ( Duk Geun Yun ) 한국안전학회(구 한국산업안전학회) 2018 한국안전학회지 Vol.33 No.5
The traffic accident types are largely classified into vehicle to vehicle accident, vehicle-to-person accident and single-vehicle. Especially, the single-vehicle accident types are severe when the vehicle crashed into road facilities such as bridge, piers, utility poles. The severity of single-vehicle accidents are ten times higher than that of all other accidents types. It is needed to consider to reduce accident severity. This study was conducted to develop crash worthy safety design facility to ensure the vehicle occupant safety. The simulation and the crash tests were conducted for assessment of the safety performance to check the criteria of CC2(Crash Cushion 2) level. THIV(Theoretical Head Impact Velocity) and PHD(Post-impact Head Deceleration) were used to assess occupant impact severity for crashes. The non-redirection collision test conditions for 900 kg and 1,300 kg-head on crash tests, 900 kg-1/4 offset crash tests, 1,300 kg-head on crash test with 15°angle were conducted. The simulation and experiment test result showed that THIV values were below 44 km/h criterion, PHD values were below the 20G. The development non-redirective crash cushion is expected to be used for the fixed object such as bridge piers for assuring occupant safety.
수치해석을 이용한 자동차 실내 온열쾌적성 향상을 위한 에어컨 토출구 위치 최적화
박재홍(Jaehong Park),서진원(Jinwon Seo),최윤호(Yunho Choi) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently, as automobile industry develops, there has been a great interest in the thermal comfort of the passengers inside the cabin of an automobile. Thermal comfort is affected by temperature, velocities, and mean radiation temperature of air, thermal resistance of clothes and physical active level of human. The present study performed computational analysis to select the location of air-conditioning vent that improves thermal comfort inside the cabin. In order to do this, we considered various air vent positions, and thermal flow analysis of each case is performed using CFD for the cabin with four passengers. The computational results are used to evaluate the thermal comfort and the optimum location of air vent is selected.