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도로구간 유형별 차량 OBD2 데이터의 군집처리를 이용한 안전운전 등급 분류
이완재(Wan-Jae Lee),고대식(Dae-Sik Ko) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.4
In this paper, an algorithm was proposed to classify the threats of operation situation using clustering analysis of eight OBD2 data on the type of driving section of road. For this purpose, OBD2 data were set to affect road type by dividing the type of road into apartment section, uphill section, downhill section, interchange section, curve section, motorway section, and rapid rotation section. Twelve types of roads were selected for validation of the proposed algorithm and eight OBD2 data were collected through a total of 30 trips for a total of 10 drivers of different ages. The results of the experiment confirmed similarities between types of road sections, and the threat assessment label could be classified into grades 0 to 4 by applying K-means algorithm among the clustering algorithm, which is a unsupervised learning technique of machine learning.
이완재(Wan-Jae Lee),박필원(Pill-Won Park) 한국정보기술학회 2019 한국정보기술학회논문지 Vol.17 No.12
In this paper, we designed a system that provides information for safe driving of the vehicle, which enables the driver to operate safely, using vehicle speed data generated during the operation of the vehicle. The configuration of the system consists of a terminal for data collection, a smartphone application with a gateway function for transmitting information collected from a vehicle to a server, and a server that implements an algorithm that can use the collected data to provide information for driver safety. The implementation of the algorithm for safe driving was embodied using the drivers information, information of the road, and vehicle speed received from the terminal. By experimenting with the vehicle speed data collected according to the location of the road and age of the driver, the proposed method in this paper is able to warn the dangerous driving if the driver is outrunning the speed limit or driving over the average speed of age.
수면 유형에 따른 체중부하운동이 사무직 중년여성의 신체조성, 1 RM 근력, 체력 및 수면의 질에 미치는 영향
이완재 ( Wan-jae Lee ),이윤환 ( Yun-hwan Lee ),이지은 ( Ji-eun Lee ),이호성 ( Ho-seong Lee ) 한국체육대학교 체육과학연구소 2023 스포츠사이언스 Vol.41 No.3
이 연구에서는 수면 유형에 따른 체중부하운동이 사무직 중년여성의 신체조성, 1 RM 근력, 체력 및 수면의 질에 미치는 영향을 알아보는데 그 목적이 있다. 18명의 사무직 중년여성을 대상으로 아침형 집단(MNG) 8명, 저녁형 집단(ENG) 8명으로 구분하였다. 체중부하운동은 8주, 주 2회 및 50분 동안 진행하였으며, 신체조성(weight, BMI, MM, BFM, BFP, WHR), 1 RM 근력(BP, LP), 체력(3MST, SR, AS, PU, CU, GS) 및 수면의 질(K-PSQI)은 체중부하운동 전, 4주 및 8주 후에 측정하였다. 1 RM 근력(BP, LP) 및 체력(3MST, SR, AS, PU, CU, GS)은 MNG 및 ENG에서 체중부하운동 전과 비교해서 4주 및 8주 후에 유의하게 증가하였으며. 수면의 질(PSQI)은 MNG에서 체중부하운동 전과 비교해서 4주 및 8주 후에 유의하게 감소하였다. 따라서 이 연구에서는 체중부하운동은 MNG 및 ENG의 1 RM 근력 및 체력을 향상시키며, MNG의 수면의 질을 개선시켰다. The purpose of this study was to investigate the effects of weight-bearing exercise according to chronotype on body composition, 1 RM muscle strength, physical fitness and sleep condition in middle-aged office workers. Eighteen middle-aged woman were randomly assighned to the morningness group (MNG, n = 8) and the eveningness group (ENG, n = 8). All subjects engaged in weight-bearing exercsie for 50 minutes, twice a week, for 8 weeks. Body composition (weight, BMI, MM, BFM,BFP and WHR), 1 RM strength (BP, LP), physical fitness (3MST, SR, AS, PU, CU, and GS) and sleep quality (K-PSQI) were measured before, 4 weeks, and 8 weeks after weight-bearing exercise. 1 RM strength (BP, LP) and Physical fitness (3MST, SR, AS, PU, CU, and GS) were significantly improved in the MNG and ENG (p < 0.05). K-PSQI was significantly improved in the MGN (p < 0.05). This study indicated that weight-bearing exercise had positive effects on physical fitness in MNG and ENG. In particular, weight-bearing exercise was more effective on sleep quality in MGN than in ENG. These results suggest that MNG may benefit from weight-bearing exercise at night for improve sleep quality.
초미립 Mn<sub>x</sub>Zn<sub>1-x</sub>Fe<sub>2</sub>O<sub>4</sub>(x = 0.69~0.74)분말의 제조 및 자기적 성질
곽재은,이완재,Kwak, Jae-Eun,Lee, Wan-Jae 한국분말야금학회 2002 한국분말재료학회지 (KPMI) Vol.9 No.6
$MnxZn_{1-x}Fe_2O_4$ (x=0.69~0.74) powders synthesized by the thermal decomposition of organic acid salts. The obtained powders were uniform in composition and ultra-fine particle with about 400 nm. The amount of spinel phase of these powders was about 50% in X-ray diffraction patterns. The calcination of powder was carried out at $900^{\circ}C$ for 2 hours in air. After the powders were calcined. the mean size of powder was about 500 nm and the amount of spinel phase was increased over about 65%. The maximum amount of spinel phase was about 75% in the specimen of X=0.72. The magnetic properties of calcined $Mn_{0.72}Zn_{0.28}Fe_2O_4$ powders were the best among the different among the different compositions.
Cu-Ni-Zn 페라이트의 미세조직과 전자파 흡수 특성
정재우,이완재,Jeong, Jae-U,Lee, Wan-Jae 한국재료학회 1995 한국재료학회지 Vol.5 No.5
EMI 대책용 전자파 흡수체로 알려진 cu-Ni-쿠 페라이트를 분말야금법으로 제조하여, 성형압력과 소결온도의 변화에 따른 미세조직을 과낯ㄹ하고, 투과반사법으로 전자파 흡수능을 측정하여 조직과의 관계로 검토하였다. 하소는 공기중에서 90$0^{\circ}C$로 2시간동안 행하는 것이 최적이었다. 미세조직과 입자의 크기는 성형압과 소결온도로 제어할 수 있다. 100Mpa로 성형한 것이 치밀하고, 전자파 흡수특성이 우수하였다. 복소유전율과 복소투자율은 기공도와 소결밀도에 영향을 받았다. 전자파흡수능은 밀도보다는 입자의 크기에 더 큰 영향을 받았다.
Hausdorff Distance와 이미지정합 알고리듬을 이용한 물체인식
김동기,이완재,강이석,Kim, Dong-Gi,Lee, Wan-Jae,Gang, Lee-Seok 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.5
The pixel information of the object was obtained sequentially and pixels were clustered to a label by the line labeling method. Feature points were determined by finding the slope for edge pixels after selecting the fixed number of edge pixels. The slope was estimated by the least square method to reduce the detection error. Once a matching point was determined by comparing the feature information of the object and the pattern, the parameters for translation, scaling and rotation were obtained by selecting the longer line of the two which passed through the matching point from left and right sides. Finally, modified Hausdorff Distance has been used to identify the similarity between the object and the given pattern. The multi-label method was developed for recognizing the patterns with more than one label, which performs the modified Hausdorff Distance twice. Experiments have been performed to verify the performance of the proposed algorithm and method for simple target image, complex target image, simple pattern, and complex pattern as well as the partially hidden object. It was proved via experiments that the proposed image matching algorithm for recognizing the object had a good performance of matching.
유기산염 열분해법에 의한 Cu - Ni - Zn 페라이트의 전자파 흡수 특성
정재우(Jae-Woo Joung),이완재(Wan-Jae Lee) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.6
The electromagnetic interference is prevented by the high magnetic loss of the ferrite. The absorbing property of electromagnetic wave could be improved by the ferrite that has a finer and more uniform microstructure. The thermal decomposition of organic acid salt provided the uniform composition and fine powder. The absorbing properties of electromagnetic wave were evaluated by the relative complex permeability, permittivity, and the attenuation which is calculated from the results of network analyzer. The permeability and permittivity were increased with increase of the density and with decrease of the grain size. The matching thickness could be reduced with increasing sintered temperature. The attenuation of the Cu-Ni-Zn ferrite showed over 20㏈ when the matching thickness and the matching frequency range were 6.75㎜ and from 160㎒z to 640㎒, respectively.