자율주행 기록장치(DSSAD) 장착을 대비한 교통사고 조사방법 연구

박기정(Kijung Park),양정훈(Jeonghun Yang),천정환(Jeonghwan Cheon) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6

In the era of automated driving vehicles, it is necessary to prepare for the installation of DSSAD in traffic accident analysis. In this study, Real vehicle experiments about the operation of the Lane Keeping Assist System (LKAS) and Automated Emergency Braking System(AEBS) function are carried out by condition. According to the driving experiment, the AEBS function is not operated when the camera and radar are covered, and LKAS function is not operated if the lane is drawn in a zigzag shape. This experiment shows the characteristics of AEBS and LKAS, which are key technologies for automated driving. In order to prepare for the installation of DSSAD, If additional researches on malfunctions and limitations such as Adaptive Cruise Control(ASCC) and Smart Rear Crash Prevention Assistance (SBSD) are carried out, its use will be maximized in the automated driving vehicles accident analysis field.

서열정렬 알고리즘과 유전체 연구에의 응용

박기정,Park, Gi-Jeong 한국미생물학회 1998 미생물학회지 Vol.34 No.1

[유전체학과 생물정보 사업]

박기정(Kiejung Park) 한국정보과학회 2005 정보과학회지 Vol.23 No.5

세무대리인의 윤리적 의사결정모형의 통합에 관한 연구

박기정 경남대학교 산업경영연구소 2003 지역산업연구 Vol.26 No.1

가정용 빗물정원을 이용한 지붕빗물내 영양소 및 중금속 제거

박기정,박희수,조윤철,김성표 한국습지학회 2015 한국습지학회지 Vol.17 No.1

대부분의 강우가 여름철에 집중되는 국내 강우 특성은 여름철 집중호우에 따른 비점 오염물질의 수계로의 과대 유입에대한 우려를 높이고 있다. 국내 수계로의 오염원 유입특성이 대부분 비점오염원 형태인 것을 감안한다면 강우가 오염물질의 거동에 미치는 영향이 매우 크다고 할 수 있다. 특히 초기 우수의 경우 상당한 영양소와 중금속에 오염되어 있는 것으로 알려져 있기 때문에 이를 적절히 처리함과 동시에 재이용하기 위한 다양한 연구가 필요하다. 이를 해결하기위한 다양한 시설 중 빗물정원은 빗물양과 수질의 조절이 가능한 친환경적이며 효과적인 방안이다. 본 연구에서는 빗물정원에 효과적으로 적용 가능한 자연형 흡착여재를 개발하고 이를 적용하여 빗물이 빗물정원을 통과한 이후 유출수의 영양소 및 유기물(TN, TP, CODcr), 중금속 제거(Cu, Cd, Pb) 효율을 검토하였다. 이를 위하여 자연형 흡착여재인피트모스를 탄화시켜 오염물질 별 제거 흡착능을 살펴보았으며, 이를 이용한 삼단의 계단식 여재 시설을 구성하여 영양소 및 중금속 제거 변화 양상을 살펴보았다. 연구결과 피트모스는 더 높은 온도에서 탄화시켰을 경우 흡착능이 우수하였으며, 피흡착제의 농도가 낮을수록 흡착이 잘 되는 것으로 나타났다. 5개의 빗물정원에서의 인공강우 오염물질 제거효율을 분석한 결과, T-N, T-P, CODcr 모두 피트모스를 사용한 반응조가 제거율이 가장 높은 것으로 나타났다. 따라서 앞으로 빗물정원을 구성하는데 있어 피트모스를 탄화한 여재를 이용한다면 보다 효과적인 오염물질 저감효과를 얻을 수 있을 것이라 판단된다. In Korea, most rainfall events occur during summer which then leads to an increasing concern regarding high influxof non-point source pollutants since the pollutant loadings from these non-point sources are very significant. Inparticular, the first flush of roof-harvested rainfall is said to contain the most highest concentration of nutrients andheavy metals. Accordingly, it is important to develope the possible water quality management options in treating thecontaminants and considering reclaimed water reuse. The rain garden could be one of suitable alternatives inaddressing this issue. In this study, the development of an effective adsorption media and its application to a lab-scalerain garden was tested to evaluate the removal rate of various nutrient and organic matter (TN, TP, CODcr), andheavy metals (Cu, Cd, Pb). Results showed that carbonized peatmoss produced at higher temperature have betteradsorption capacity as compared to the one produced at a lower temperature. When the carbonized peatmoss wasapplied as rain garden media, the highest removal of TN, TP, and CODcr was observed compared to no carbonizedpeatmoss applied rain garden. Therefore, this study showed that the carbonized peatmoss would be effectively appliedto the rain garden for removing nutrients and heavy metals from roof-harvested rainwater.

R1234yf와 R1234yf/R134a의 자동차 에어컨 작동 조건에서의 성능 평가

박기정(Ki-Jung Park),이요한(Yohan Lee),최대성(Daeseong Choe),정동수(Dongsoo Jung) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.12

In this study, performance of R1234yf and R1234yf/R134a mixture is measured on a heat pump bench tester in an attempt to substitute R134a used widely in mobile air conditioners (MACs). The bench tester is equipped with a open type compressor providing a nominal capacity of 3.5 ㎾. All tests are conducted under the summer cooling and winter heating conditions of 7/4 5℃ and -7/41℃ in the evaporator and condenser, respectively. For R1234yf/R134a mixture, measurements are made at 5%, 10%, and 15% of R134a by mass. Test results show that the coefficient of performance (COP) and capacity of R1234yf are up to 2.7% and 4.0% lower than those of R134a, respectively. For R1234yf/R134a mixture, the COP and capacity are up to 3.9% lower and 3.6% higher than those of R134a. For R1234yf and R1234yf/R134a mixture, the compressor discharge temperature is 4.1~6.7℃ lower than that of R134a while the amount of charge is reduced up to 11% as compared to R134a. 90%R1234yf/10%R134a is a better refrigerant than pure R1234yf in that it is less flammable and more compatible with existing R134a system. Based upon the results, it is concluded that R1234yf and R1234yf/R134a mixture are long term environmentally friendly solutions to mobile air-conditioners due to their excellent environmental properties with acceptable performance.

경부척추조작술 또는 경부수상과 관련된 척추기저동맥계뇌경색 3예

박기정,윤상수,박정혁,장대일,김의종,최우석,정경천 대한신경과학회 1997 대한신경과학회지 Vol.15 No.4

수평 평활관내 R245fa의 흐름 응축 열전달 특성

박현신(Hyun-Shin Park),박기정(Ki-Jung Park),정동수(Dongsoo Jung) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.2

Flow condensation heat transfer coefficients(HTCs) of R123 and R245fa are measured in a horizontal plain tube. The main test section in the experimental flow loop is made of a plain copper tube of 9.52 ㎜ outside diameter and 530 ㎜ length. The refrigerant is cooled by passing cold water through an annulus surrounding the test section. Tests are performed at a fixed saturation temperature of 50 ± 0.2 ℃ with mass fluxes of 50, 100, 150 ㎏/㎡s and heat flux of 7.3~7.7 ㎾/㎡. Heat transfer data are obtained in the vapor quality range of 10~90%. Test results show that the flow condensation HTCs of R245fa are overall 7.9% higher than those of R123 at all mass fluxes. The pressure drop of R245fa is smaller than that of R123 at the same heat flux. In conclusion, R245fa is a good candidate to replace ozone depleting R123 currently used in chillers from the view point heat transfer and environ-mental properties.

상이한 수소이온농도에서 성장하는 Methylobacterium extorquens AM1의 메탄올 이용 관련효소와 Cytochrome c 및 폴리아민

박기정,이순희,김영민 한국미생물학회 1992 미생물학회지 Vol.30 No.6

Methylobacterium extorquens AM1 이 pH 5.5 와 7.0 에서 메탄올을 이용하여 성장할 때의 세대 시간은 각각 25 시간과 8.3 시간이었다. pH 7.0 에서 성장한 세균들은 모두 지수성장기 중기에서 가장 높은 methanol dehydrogenase (MDH_) 의 활성을 나타내었고, MDH 함유량은 성장시기에 따른 변화를 보이지 않았다. 세포내 cytochrome c 는 정체기에서 높게 나타났고 pH 7.0 에서 성장한 세균에 더 많이 존재하였다. Putrescine 또는 spermidine 이 첨가된 pH 5.5 의 배지에서 성장한 세균에 더 많이 존재하였다. Putrescine 또는 spermidine 이 첨가된 pH 5.5 의 배지에서 성장한 세균에서는 putrescine 의 함량은 증가하였으나 spermine 의 함량은 감소하였고 spermidine 의 함량에는 변화가 없었다. Spermine 을 첨가한 배지에서 성장한 세균에서는 폴리아민함량에 변화가 없었다. Putrescine 또는 spermidine이 첨가된 배지에서 성장한 세균에서 MDH 와 hydroxypyruvate reductase 의 활성이 증가되었고 MDH 와 cytochrome c 의 함량에는 변화가 없었다. 폴리아민은 invitro 상태에서 MDH 와 hydroxypyruvate reductase 의 활성을 증가시키지 않았다. The generation time of Methylobacterium extorquens AMI growing on methanol at pH 5.5 and 7.0 was found to be 23 hand 8.3 h. respectively. The bacterium grown at pH 7.0 were found to contain more amounts of spermidine and putrescine than the cell grown at pH 5.5. Cells grown at both conditions exhibited strong methanol dehydrogenase (MDH) activity at the mid-exponential growth phase. The amounts of MDH. however. were found to be almost equal through all gro~1h phases. Cells growing at the stationary phase contained large amounts of cytochrome c. The cytochrome c content was higher in cells growing at pH 7.0 than the cells growing at pH 5.5. Cells growing at pH 5.5 in the presence of putrescine or spermidine contained increased amounts of putrescine. The level of spermine, however. was decreased and that of spermidine was not changed. Spermine added into the medium was found to have no effect on the level of cellular polyamines. Putrescine or spermidine added into the medium stimulated MDH and hydroxypyruvate reductase activities. but did not affect the contents of MDH and cytochrome c. It was found that preincubation of cell-free extracts with polyamines does not stimulate MDH and hydroxypyruvate reductase activities.

탄화수소계 냉매의 풀비등 열전달 상관식 개발

박기정,백인철,정동수 대한설비공학회 2006 설비공학 논문집 Vol.18 No.3

In this work, pool boiling heat transfer coefficients(HTCs) of hydrocarbon refrigerants are measured from a horizontal smooth tube of 19.0mm outside diameter. Tested pure·refrigerants are Propylene, Propane, Isobutane, Butane and Dimethylether(DME). The pool temperature was maintained at saturation temperature of 7℃ and heat flux was varied from 10kW/m2 to 80kW/m2 with an interval of 10kW/m2. Wall temperatures were measured directly by thermocouple hole of 0.5mm out-diameter, 152mm long and inserting ungrounded sheathed thermocouples from the side of the tube. Tested results show that HTCs of Propane, Propylene are 2.5%, 10.4% higher than those of R22 while those of Butane and Isobutane are 55.2%, 44.3% lower than those of R22 respectively. For pure refrigerants, new correlation can be applied to all of CFCs, HCFCs, HFCs, as well as hydrocarbons was developed. The mean deviation was 4.6%.