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Evaluation of Advanced Adaptive Cruise Control Based on Lane-Change Detection
Hanwool Woo,Jongseong Gwak 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
Autonomous driving is expected to substitute human drivers and decrease the number of traffic accidents. Among various techniques for autonomous driving, ACC (adaptive cruise control) is one of the commercialized ADAS (advanced driver-assistance systems) and widely used. However, some of drivers conduct a risky lane-changing in the real world. In this case, a conventional ACC system conducts an excessive deceleration for avoiding a crash with the cut-in vehicle, and it can conversely cause a crash with the following vehicle. To solve this problem, our research group has developed an advanced ACC system to detect a cut-in vehicle and adjust the speed of host vehicle in advance before the cut-in vehicle crosses the centerline. In our previous work, evaluation of the proposed system was insufficient since the evaluation was conducted based on the simulation. To strictly validate the proposed system, we conducted experiments using a DS (driving simulator) and evaluated the effectiveness of the proposed system with respect to various lane-changing patterns performed by the experimental participants. Through the experiments, it was confirmed that the proposed system achieved better driving safety compared to the conventional ACC system.
Lane-Changing Feature Extraction Using Multisensor Integration
Hanwool Woo,Yonghoon Ji,Hitoshi Kono,Yusuke Tamura,Yasuhide Kuroda,Takashi Sugano,Yasunori Yamamoto,Atsushi Yamashita,Hajime Asama 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
We propose a feature extraction method for lane changes of other traffic participants. According to previous research, over 90 % of car crashes are caused by human mistakes, and lane changes are the main factor. Therefore, if an intelligent system can predict a lane change and alarm a driver before another vehicle crosses the center line, this can using the multisensor system which consists of a position sensor and a laser scanner with line markings information. For a lane change prediction of other traffic participants, the most effective features are a lateral position and velocity with respect to a center line. We installed the sensor system to the primary vehicle and measured positions of other traffic participants while the primary vehicle drives on a highway. We extracted the features as the distance with respect to the center line and the lateral velocity of other vehicles using the measurement data. We confirmed that our feature extraction method has an enough accuracy for the lane change prediction.
Abdominal wall Endometriosis at the Cesarean Section Scar: A Case Report
( Hanwool Kim ),( Sae-kyung Choi ),( Woo Jeng Kim ) 대한산부인과학회 2022 대한산부인과학회 학술대회 Vol.108 No.-
1.Introduction Endometriosis is a disorder of the presence of endometrial glands outside the uterine cavity and is known to occur in 10-15% of women of childbearing age. Endometriosis of the abdominal wall can consist of diagnosis difficulties and discomfort due to symptoms, so prompt diagnosis and accurate treatment are required. We would like to report a care report for endometriosis that occurred at the cesarean section scar. 2.Case report A 33-year-old woman referred with a painful lower abdominal nodular mass around the cesarean section incision site. A movable mass of about 2.5 cm was palpable on the right aspect of the Pfannenstiel incision of a previous cesarean section scar. Magnetic resonance imaging (MRI) was performed for differential diagnosis, and a 2.4cmX1.3cm mass showing prominent peripheral enhancement was confirmed. Endomeriosis and desmoid tumor were suggested as presumptive diagnoses. Surgical excision was planned, and what was confirmed during the operation was a hard mass surrounded by fat tissue. A fibroid shape was observed in the cross section. Pathologic examination confirmed the expression of estrogen receptors, staining with anti-CD 10, and finally diagnosed endometriosis. 3.Conclusion Abdominal endometriosis is a rare form known to be associated with a history of abdominal surgery. The origin is presumed to be endometrial transplantation and implantation during surgery. Abdominal endometriosis is known to be reported in 3.5% of gynecological surgeries, of which 0.8% are related to cesarean section. Diagnosis may be delayed because it is easy to confuse with other dermatological and surgical diseases. However, since it is a lesion that causes discomfort to the patient, prompt diagnosis and surgical resection are required, and histological confirmation is important. Healthcare providers should suspect cutaneous endometriosis in women who have pain and lumps in the incision scar after pelvic surgery.
저온 생장성이 우수한 분리 미세조류 Tetraselmis sp. 5개주의 생장 패턴 및 지방산 조성 분석
박한울(Hanwool Park),허동희(Donghee Hoh),신동우(Dong-Woo Shin),김지훈(Z-Hun Kim),홍성주(Seong-Joo Hong),임상민(Sang-Min Lim),이철균(Choul-Gyun Lee) 한국해양바이오학회 2019 한국해양바이오학회지 Vol.11 No.1
For successful microalgal biodiesel production, the strain should be selected carefully. Fast growth rate and high fatty acid contents are desired traits for algal biodiesel production. In ocean cultivation of microalgae, seawater temperature slowly changes over seasons, and rotating algal strains in accordance with their optimal temperature could improve overall productivity. Additionally, use of indigenous strain is preferred to alleviate potential impacts on the environment. In this study, five strains of Tetraselmis sp. from nearshore of Youngheung Island, Incheon, Korea, were isolated during winter and characterized for their growth patterns and fatty acid compositions in the low temperatures (5–15°C). The five strains showed various characteristics in optimal growth temperature, fatty acid contents, and compositions. Compared with a strain of Tetraselmis sp., isolated from Ganghwa island in a previous study, a rapid-growing strain with 237% higher biomass productivity and an oleaginous strain with twice higher fatty acid contents at 10°C were isolated. The oleaginous Tetraselmis strain showed the highest fatty acid productivity among the strains, having 438% higher productivity than the previous strain. Using the new isolates in the seasons with low seawater temperature would improve microalgal fatty acid productivity in ocean cultivation.