고속도로 화물차의 군집주행이 교통류에 미치는 영향 및 전용차로 효과 연구

김주혜,이영인,KIM, Joohye,Lee, YoungIhn 한국ITS학회 2020 한국ITS학회논문지 Vol.19 No.5

화물차 군집주행이 화물교통량 증가에 따른 문제를 해결할 수 있는 대안으로 떠오르는 가운데, 화물차 군집주행이 교통류에 미치는 영향과 군집주행 전용차로 도입 효과를 분석하는 연구를 수행하였다. 연구결과, 교통량이 많고 화물차 혼입률이 높아질수록 화물차의 군집비율이 높아지고 최대 군집형성 규모가 증가함에 따라 군집주행으로 인한 평균속도 증가효과가 더 크게 나타났다. 하지만, 진출입 등으로 대기행렬이 발생한 경우에는 평균속도 증가효과는 기대하기 어려우며 오히려 처리량이 감소할 수 있는 것으로 분석되었으므로 접속부의 용량 확보 등 접속도로와 연계된 교통운영 전략이 필요하다는 점을 확인할 수 있었다. 군집 전용차로의 효과는 자율주행화물차 비율(MPR)이 100%가 되어 한 개 차로가 완전히 자율주행화물차만으로 운영될 경우에만 미 도입 시 보다 긍정적 효과를 얻을 수 있었다. 본 연구는 국내 도로·교통 조건을 시나리오에 반영하여 군집주행의 영향을 종합적으로 분석하였으므로 구간별, 시간대별로 군집주행 및 전용차로의 영향을 가늠해 볼 수 있으며, 이는 향후 화물차 군집주행을 고려한 도로 운영전략 수립이나 관리에 기초자료로 사용할 수 있을 것으로 판단된다. Considering the need for an infrastructure-level review, this study analyzed the impact of truck platooning on freeway traffic flow and the effect of dedicated lanes based on domestic road and traffic conditions. According to the study, the higher traffic volume and truck ratio, the higher ratio of platoons and the greater size of platoons are formed, which results in greater effect of increasing the average speed of the network. Therefore, the routes with heavy traffic and heavy cargo traffic could be positively considered for truck platooning. However, the analysis showed that the effect of increasing the average speed of the entire network is difficult to expect in the event of a queue due to entry and exit, and that the overall network's throughput could be reduced. Therefore, traffic operation strategies associated with the access road, such as securing capacity of the connection, are needed to maximize the effect of truck platooning. When it comes to the effect of dedicated lane, it could have a positive effect only if one lane was fully operated by automated trucks under the condition of 100% MPR, which allowed positive effects in all aspects, such as higher average speed, throughput, and reduced conflict rates.

다이오드 검출기를 이용한 초소형 X선관(Miniature X-ray Tube)의 반가층 측정

김주혜,안소현,오윤진,지윤서,허장용,강창무,서현숙,이레나,Kim, Ju-Hye,An, So-Hyeon,Oh, Yoon-Jin,Ji, Yoon-Seo,Huh, Jang-Yong,Kang, Chang-Mu,Suh, Hyunsuk,Lee, Rena 한국의학물리학회 2012 의학물리 Vol.23 No.4

X선은 방사선 진단과 치료 분야에 있어서 다양하고 광범위하게 이용되고 있으며, 최근에는 방사선 치료용 초소형 X선관이 개발되었다. 초소형 X선관은 조사 목적 부위에 직접 삽입하여 사용되므로 제작 시준기에 따라 다양한 각도로 X선 조사가 가능하고, 검사 목적 외의 환자 피폭선량을 최소화한다. 이러한 초소형 X선관의 장점을 이용해서 X선 영상을 획득하는데 적용한다면 X선 진단 분야의 새로운 장을 열 것으로 기대된다. 하지만 초소형 X선관은 본래 치료용으로 설계되었기 때문에 진단용 장비에 적합한 시준기, 필터(added filter) 등이 필요하다. 따라서 자체 제작한 시준기와 필터를 적용하여 초소형 X선관의 빔 특성이 진단용에 적합한지 평가 하였고, 이를 위해서 다이오드 검출기를 이용하여 반가층을 측정하고 측정의 가능성을 평가하였다. 본 연구에서는 Si PIN Photodiode type인 Piranha 검출기(Piranha, RTI, Sweden)를 사용하여 필터 적용 유무에 따른 초소형 X선관의 반가층을 측정하고, 알루미늄 필터를 사용한 측정을 통하여 Piranha 검출기의 반가층 측정의 정확성을 평가하였다. 측정 결과에 따르면 초소형 X선관의 반가층은 필터의 장착에 따라 약 1.9배 증가하여 진단용 방사선 발생 장치의 적합성을 확인하였다. Piranha 검출기의 반가층 자동 측정값은 필터를 미장착한 경우에 실제 반가층 측정값에 비해 50% 높게 측정되어 적용이 불가능하나, 필터를 장착한 경우에는 실제 반가층 측정값과 약 15%의 차이로 감소되었다. 따라서 진단용 필터를 적용했을 경우는 Piranha 검출기의 반가층 자동측정이 가능하여 kV-X선 특성평가를 수월하게 수행할 것으로 기대된다. The X ray has been widely used in both diagnosis and treatment. Recently, a miniature X ray tube has been developed for radiotherapy. The miniature X ray tube is directly inserted into the body irradiated, so that X rays can be guided to a target at various incident angles according to collimator geometry and, thus, minimize patient dose. If such features of the miniature X ray tube can be applied to development of X ray imaging as well as radiation treatment, it is expected to open a new chapter in the field of diagnostic X ray. However, the miniature X ray tube requires an added filter and a collimator for diagnostic purpose because it was designed for radiotherapy. Therefore, a collimator and an added filter were manufactured for the miniature X ray tube, and mounted on. In this study, we evaluated beam characteristics of the miniature X ray tube for diagnostic X ray system and accuracy of measuring the HVL. We used the Si PIN Photodiode type Piranha detector (Piranha, RTI, Sweden) and estimated the HVL of the miniature X ray tube with added filter and without added filter. Through an another measurement using Al filter, we evaluated the accuracy of the HVL obtained from a direct measurement using the automatic HVL calculation function provided by the Piranha detector. As a result, the HVL of the miniature X ray tube was increased around 1.9 times with the added filter mounted on. So we demonstrated that the HVL was suitable for diagnostic X ray system. In the case that the added filter was not mounted on, the HVL obtained from use of the automatic HVL calculation function provided by Piranha detector was 50% higher than the HVL estimated using Al filter. Therefore, the HVL automatic measurement from the Piranha detector cannot be used for the HVL calculation. However, when the added filter was mounted on, the HVL automatic measurement value using the Piranha detector was approximately 15% lower than the estimated value using Al filter. It implies that the HVL automatic measurement can be used to estimate the HVL of the miniature X ray tube with the added filter mounted on without a more complicated measurement method using Al filter. It is expected that the automatic HVL measurement provided by the Piranha detector enables to make kV-X ray characterization easier.

LC-MS/MS를 이용한 수산물 중 니트로빈의 정량분석법 개발 및 검증

김주혜,신다솜,강희승,정지윤,이규식,Kim, Joohye,Shin, Dasom,Kang, Hui-Seung,Jeong, Jiyoon,Rhee, Gyu-Seek 한국식품위생안전성학회 2018 한국식품위생안전성학회지 Vol.33 No.2

본 연구에서는 우리나라 식품공전에서 불검출 물질로 관리하고 있는 니트로빈(nitrovin)에 대해 고감도 정량 정성분석이 가능한 LC-MS/MS를 적용하여 적합한 분석법을 제시하고자 하였다. 수산물 시료는 아세토니트릴/물로 추출하고 아세토니트릴 포화 헥산으로 지방을 제거하여 고상추출 카트리지를 적용하여 정제하였다. 분석물질은 전기분무이온화방법의 positive mode에서 이온화하여 MRM 조건을 확립하여 분석하였다. 개선된 시험법은 CODEX CAC/GL-71 가이드라인에 따라서 정확성, 정밀성, 직선성, 정량한계에 대한 검증을 통하여 유효성을 확인하였다. 본 실험에서의 정량한계는 0.001 mg/kg 수준이며, 정량한계를 포함하는 표준시료에서 얻어진 검량선의 상관계수($r^2$)는 0.985 이상으로 시험법의 직선성이 유효함을 판단할 수 있었다. 또한, 수산물(넙치, 장어 및 새우) 시료에 대한 니트로빈의 평균 회수율과 변동 계수는 72.1~122%, 2.9~16.9%로 확인되어 정확성 및 정밀성이 CODEX가이드라인에 부합하였다. 따라서, 개선된 니트로빈 정량분석법은 수산물 중 니트로빈을 분석하는데 적합하며, 니트로빈에 대한 지속적인 잔류실태조사에 활용되어 수산물 중 니트로빈의 안전관리에 기여할 것으로 판단된다. The objective of this study was to develop a sensitive method for the identification and determination of nitrovin in fishery products by using a solid-phase extraction (SPE), as performed with a liquid chromatography-tandem mass spectrometry (LC-MS/MS). The samples were extracted with a mixture of acetonitrile and water, and were then defatted with acetonitrile saturated hexane, after which further clean-up was accomplished with SPE on the hydrophilic-lipophilic balance (HLB) cartridges. The analytes were subsequently ionized in the positive mode of an electrospray ionization (ESI), and where thereby detected in a process of multiple reaction monitoring (MRM). The linearity (expressed as correlation coefficients) of the matrix calibration curves was > 0.985. The limit of the quantification for the nitrovin was measured at 0.001 mg/kg. The accuracy (expressed as average recovery) was noted between 72.1 and 122%. The precision (expressed as coefficient variation) was noted from 2.9 to 16.9%. According to the CODEX CAC/GL-71 guideline accuracy, precision, linearity, and limit of detection were determined in three matrices (which were flatfish, eel and shrimp). The proposed method was suitable for analyzing the associated nitrovin residues. This application and result can also be a factor to contribute to the non-detection drugs management in fishery products.

[<SUP>14</SUP>C]Butachlor의 벼에 대한 흡수 및 대사

김주혜(Ju-Hye Kim),김종환(Jong-Hwan Kim),김대욱(Dae-Wook Kim),이봉재(Bong-Jae Lee),김찬섭(Chansub Kim),임양빈(Yangbin Ihm),서종수(Jong-Su Seo) 한국농약과학회 2015 농약과학회지 Vol.19 No.3

In the present study, the metabolism of [<SUP>14</SUP>C]butachlor was investigated in rice plant according to the OECD test guideline No. 501. [<SUP>14</SUP>C]Butachlor was treated as granule to paddy water by application of 1.5 kg ingredient (a.i.)/ha at the 3~4 leave stage of rice plant. At 85 days after treatment (DAT), samples of panicle, foliage, and roots were taken for radioactivity analysis. Upon harvest at 126 DAT, rice plants were separated into brown rice, husk, straw, and root parts. Amounts of total radioactivity absorbed by rice plant ranged from 8.6 to 9.8% of applied radioactivity (AR). Total radioactive residues (TRRs) of rice plant at 126 DAT was the highest as 4.0421 mg/kg (7.3% AR) in the straw followed by 1.4595 mg/kg (2.4% AR) in the root, 0.7257 mg/kg (0.1% AR) in the husk. The lowest level recording 0.1020 mg/kg (0.1% AR) was found in brown rice. Each part was extracted with various solvents and solvent/water mixtures. Greater than 70% of TRRs was readily extractable from foliage, panicle, husk and straw. Only 34.0% of the brown rice and 43% of root based on TRRs were extractable showing that the residues were completely assimilated in the plant tissue. The level of non-extractable radioactivity was ranged from 26.2 to 66.0% of TRRs. From this study, five tentative major metabolites (M1, M2, M3, M4 and M5) were observed in rice extracts. Among the metabolites, 2,6-diethylaniline assigned as M4 was identified in rice plant by comparing to retention time of reference standard. Un-metabolized butachlor was not detected in any fractions. In soil extracts, N-(butoxymethyl)-N-(2,6-diethyl phenyl)acetamide, 2,6-diethylaniline, M2, M3 and M5 were observed. And the concentration of butachlor was low level (ca. 0.03 mg/kg).

[<SUP>14</SUP>C]Butachlor를 이용한 호기성 토양대사 시험법 확립

김주혜(Ju-Hye Kim),김종환(Jong-Hwan Kim),김대욱(Dae-Wook Kim),이봉재(Bong-Jae Lee),김찬섭(Chan Sub Kim),임양빈(Yangbin Ihm),서종수(Jong-Su Seo) 한국농약과학회 2014 농약과학회지 Vol.18 No.4

The test method of aerobic transformation in soil has established based on international test guideline (OECD TG 307). And then, the case study was conducted with [<SUP>14</SUP>C]butachlor. Butachlor is commonly used herbicide in Korea. [<SUP>14</SUP>C]Butachlor was treatrd 6.83 mgKg?1 in loamy soil. The treated soil was incubated in flow-through system for 60 days. The mass balance of applied radioactivity (AR) ranged from 91.1 to 95.5% and from 93.0% to 97.7% for non-sterile and sterile soils, respectively. In non-sterile soil, the concentration of [<SUP>14</SUP>C]butachlor was declined from 94.4% AR at 0 day to 8.4% AR at 60 days after treatment. 2-Chloro-2,6-diethylacetanilide was the major degradation product detected in soil extract. The calculated DT50 and DT90 of butachlor were 10.4 days and 34.6 days, respectively. <SUP>14</SUP>CO₂ and non-extractable soil residue were increased up to 3.5% and 43.5% AR at 60 DAT. There is no significant decrease of the [<SUP>14</SUP>C]butachlor through the incubation period in sterile soil.

이러닝(e-Learning) 상황에서의 영어 학습 불안도 연구 : 사이버대학교 학생들을 중심으로

김주혜(Kim Joo-hae),김영우(Kim Young woo) 한국외국어교육학회 2005 Foreign languages education Vol.12 No.4

This study attempts to examine the existence of foreign language anxiety in e-Learning situations, and then identify relationships between the anxiety and learner background factors. A total of 162 EFL learners participated in the survey. Their anxiety was measured by the e-Foreign Language Classroom Anxiety Scale (e-FLCAS). The results suggest that foreign language learners do indeed experience anxiety in e-Learning classrooms. A majority of the participants acknowledged having experienced specific kinds of anxiety in cyber classes: worry over e-Learning education, online test anxiety, learning style conflicts, and apprehension of native teachers. In addition, e-Learning anxiety was found to be significantly related to three background factors (gender, academic backgrounds, and English proficiency). The results also provide a potential explanation of anxiety-producing contexts in cyber classrooms, the sources of anxiety, and coping strategies that students use to lower their anxiety.

중국 태양광·BESS 산업의 글로벌 시장 독점화와 주요국 대응

김주혜 ( Joo Hye Kim ) 대외경제정책연구원 2023 대외경제정책연구원 연구자료 Vol.23 No.8

이러닝(e-Learning)을 통한 외국어 학습에서 동기유발에 대한 연기

김주혜(Kim Joohae),이정화(Lee Jeong-Hwa),조수근(Cho Sookeun) 한국영어학회 2006 영어학 Vol.6 No.3

학교차원의 장애이해교육이 일반 초등학생의 장애 학생에 대한 태도 변화에 미치는 영향

김주혜 ( Joo Hye Kim ) 한국특수아동학회 2012 특수아동교육연구 Vol.14 No.4

The students without disabilities` positive attitudes toward students with disabilities are essential in other to educate students with disabilities successfully. The purpose of this study was to investigate the effectiveness of a school-wide program to facilitate understanding of disability on attitudes toward students with disabilities. The participants were around 1075 students in grades from 1 to 5 at a elementary school in Seoul. The school―wide program to facilitate understanding of disability is divided into two parts: the disability-awareness education for students in 3-5 grades and the anti-bias education for students in 1-2 grades. We implemented a total 175 sessions for 3months, 5-sessions per class. To analyze the date, t-test and ANCOVA has been executed. The results of the study are as follows: 1) The school-wide program to facilitate understanding of disability could contribute to improve the elementary school students` attitudes toward students with disabilities. 2) students in 1-2 grades` attitudes toward students with disabilities was more positive than students in 3-5 grades. 3) students in 3-5 grades have shown a significant increase in attitudes toward students with disabilities.

이러닝 구성요소에 근거한 영어 학습자의 정서적 측면 연구 - 불안감을 중심으로

김주혜(Kim Joo-hae) 팬코리아영어교육학회(구 영남영어교육학회) 2007 영어교육연구 Vol.19 No.2

  On the basis of e-learning system constituents (contents, delivery system, and management system), this study investigated EFL learners’ anxiety through students’ descriptions of their e-learning experience. Two different qualitative techniques were used, and some salient findings were used as themes. First, 129 students at a cyber university in Seoul completed a questionnaire survey. Survey data were analyzed to examine students’ emotional aspects of e-learning. Second, 16 students who had participated in the survey were interviewed regarding their foreign language anxiety. The interviews were conducted as free conversations with a set of guiding topics. Various data were produced from the surveys and interviews, and the data were compiled into non-verbatim transcripts. Through multiple readings and multiple theme identifications, the following patterns of EFL learners’ anxiety regarding the e-learning system were identified: 1) anxiety caused by excessive content load, high content level, late notice of reports and exams, and native-speaking teachers 2) computer anxiety (related to hardware, software, network, and solutions) 3) anxiety caused by teachers and lack of communication with e-learning classmates. Suggestions are made to help foreign language learners overcome their anxiety regarding their e-learning classes.