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전기차 자율 충전을 위한 AVM 영상 기반 무선충전패드 검출
봉은정,이동규,기석철 한국자동차공학회 2023 한국 자동차공학회논문집 Vol.31 No.9
This paper proposes a method of recognizing a wireless charging platform environment based on an AVM image to determine a charging situation and detect the center coordinates of a wireless charging pad. With this technology, it is expected that true unmanned autonomous driving will be possible when a system by which electric vehicle-based, self-driving cars can repeat self-charging and driving is completed. An AVM image was created through calibration, and a learning dataset was generated based on the AVM image acquired from the wireless charging platform. A recognition algorithm for the wireless charging platform environment was implemented using the HRNet model, and a linear Kalman filter-based object tracking and a relationship-based object position coordinate estimation algorithm were implemented. The performance of each algorithm was evaluated using its own dataset, 3D PointCloud Map, and localization techniques. The performance evaluation of the relationship-based object estimation algorithm yielded an average error of 0.07 m.
이영(Young Lee),백은정(Eun Jeong Baik),신종철(Jong Chul Shin),정대영(Dae Young Chung),김수평(Soo Pyung Kim),김창이(Chang Yee Kim),문희봉(Hee Bong Moon),이종승(Chong Seung Yi) 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.1
목적: 태아 심박동(fetal heart rate; FHR)은 자율신경계의 조절로 나타나는 현상으로 정상 심박동은 자체의 주기성, 교감 신경 또는 미주 신경 및 부교감 신경으로부터 영향을 받는다. 자율신경 하에 조절되는 심장박동은 성인의 경우 나이 성별에 따른 차이가 있으며, 성별에 따른 자율신경의 생리 작용이 다르다는 것을 알 수 있다. 이에 저자들은 태아 성별에 따른 임상적 여러 변수들 그리고 태아 심박동과 차이를 연구하였다. 연구 방법: 가톨릭 의과대학 산부인과학 교실에 산전 진찰 및 분만을 위해 내원한 산모 중 전자식 태아감시 장치를 시행하였고, 본원에서 분만하여 신생아 임상 소견을 알 수 있었던 317명의 667개의 태아 심박동 자료를 대상으로 하여, 기초 태아 심박동수, 태아 심박동 증가, 태아 심박동 감소, Percent acceleration time(PAT) 및 Percent deceleration time(PDT)를 계산하였고, 변이도로 표준 편차, Mean minute range(MMR)의 장기변이도(LTV) 및 단기변이도(STV)를 계산하였다. 결과: 분석 결과 남아 분만군과 여아분만군의 비교에서 기초 태아 심박동수 137.64±13.68 bpm, 140.51±12.43bpm(P=0.007), PAT는 6.10±4.00bpm, 4.90±3.34bpm(P=0.001), 그리고 PDT는 7.50±8.70bpm, 6.18±7.70bpm(P=0.039)으로 유의한 차이가 있었으나, 표준 편차는 8.84±10.11bpm, 8.11±3.56bpm, LTV는 80.38±62.79msec과73.65±54.60msec, STV는 14.06±9.79msec과 13.33±12.32msec로 차이가 없었다. 결론: 위의 결과로 남아와 여아의 태아 심박동은 차이가 있으며, 이는 발생 시기부터의 부교감 신경과 교감 신경의 발달 차이로 인한 심장 및 체강의 연결계의 차이가 임신 기간 중에 발생한는 것이 원인으로 사료 된다. Objectives: The purpose of this study is to analyze the previously unreported effect of fetal sex on the fetal heart rate and to measure its magnitude in relation to the effects of other independent clinical variables. Methods: Three hundred and seventeen pregnant women who were able to provide electronic fetal heart rate monitoring were evaluated. On the basis of fetal sex after birth, 167 pregnant women who delivered male neonate were for males group and 146 examples who delivered female neonate were for female group. We analyzed fetal heart rate data using the Catholic Computer Assisted Obstetric Diagnosis System(CCAOD). Results: Female fetuses had significantly faster basal heart rate(140.51±12.43bpm) than male fetuses(137.64±13.68 bpm).(P=0.007) Percent acceleration time(PAT) increased significantly for males(6.10±4.00bpm), comparing to females(4.90±3.34bpm).(P=0.001) Also percent deceleration time(PDT) was significantly higher in male fetuses(7.50±8.70bpm) than female fetuses(6.18±7.70bpm).(P=0.039) But there was no differences in standard deviation(SD)(8.84±10.11bpm, 8.11±3.56bpm), long term variation(LTV)(80.38±62.79msec, 73.65±54.60msec), and short term variation(STV)(14.06±9.79msec, 13.33±12.32msec) between male and female fetuses. Conclusion: The fetal heart rate of female fetuses differ from that of male fetuses. Computerized linear analysis and nonlinear analysis of antepartum fetal heart rate will need to take into account the multiple factors that influence the fetal heart rate to identify precisely which pattern predict clinical outcome.
중증 및 경증 자간전증 태반에서 간세포성장인자 및 수용체의 발현
정대영,신종철,양동은,이지현,김수평,문희봉,김사진,김창이,백은정 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.8
Objectives : Hepatocyte growth factor (HGF) is a pleiotrophic cytokine that play an important role in cell migration, proliferation, morphogenesis and angiogenesis in many different cell types. Although the etiology of preeclampsia is still unknown, this disease is characterized by reduced invasion of trophoblastic cells, and as HGF might stimulate the invasion of placental trophoblast through the activation of c-Met, we studied whether difference in the expression of HGF and c-Met is present between placentas of normal and preeclamptic pregnancies, to elucidate the possible relationship between HGF and c-Met expression and the pathogenesis of preeclampsia. Methods : The samples were obtained from human placentas of three groups - normal, mild and severe preeclamptic pregnancies - in third trimester. For evaluation of HGF and c-Met mRNA expression, 25 cycles of reverse transcription-polymerase chain reaction (RT-PCR) using specific primers was performed after isolating total RNA from the placental samples, and then southern blot was used for detection of PCR products. Western blot analysis was performed to measure HGF in protein levels. Results : The HGF mRNA expressions of mild and severe preeclamptic pregnacies were 79% and 39% respectively, compared with that of normal pregnancy. The c-Met mRNA expressions of mild and severe preeclamptic pregnacies increased in 47%와 49% respectively, compared with that of normal pregnancy. The HGF protein expression of mild and severe preeclamptic pregnacies were 58% and 24% respectively, compared with that of normal pregnancy. Conclusion : These results suggest that the lowered expression of placental HGF in preeclampsia might be closely associated to the lack of trophoblast invasion that may be the key in pathogenesis of preeclampsia.