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EV Formula 조향 너클의 서스펜션 지오메트리 최적화 및 경량설계
심민서(Minseo Shim),김종수(Jongsu Kim),남도엽(Doyeop Nam),박재필(Jaepil Park),이경도(Kyungdo Lee),배건일(Keonil Bae),최우석(Wooseok Choi),신종현(Jonghyeon Shin),장재성(Jaeseong Jang),김서현(Seohyeon Kim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
Two of the most important parts of designing an E.V vehicle are minimizing weight and improving vehicle performance. The steering knuckle, which is connected to and supports the wheel, tie rod, brake caliper and links, is a critical part of the car’s steering system. This is because incorrect geometry and additional mass on the steering knuckle affects the stability and performance of the vehicle in dynamic condition. The paper illustrates the forces acting on the steering knuckle, the failure criteria and the optimization of the component. Optimization has been carried out varying the shape and mass characteristics of the steering knuckle and suspension system parameters. CAD model of the wheel assembly had been developed using CATIA, with respect to geometric parameters obtained on suspension and steering system analysis using CARTCROSS software with various structural and geometric constraints. Topology analysis was done to reduce the additional mass of the wheel assembly. Then, Finite element analysis of the steering knuckle carried out using ANSYS WORKBENCH for static and basic dynamic loading conditions without compromising its geometric and load transfer characteristics.
김민서(Minseo Kim),최선아(Seon-ah Choi),김민관(Min-Kwan Kim),이명식(Myeongsig Lee),배성훈(Seoung-Hun Bae) 한국혁신학회 2021 한국혁신학회지 Vol.16 No.4
본 연구는 4차 산업혁명으로 인한 기술의 융⋅복합으로 등장한 Smart-X에서 주로 제기되는 문제인 불필요한 예산 낭비와 시너지 창출의 어려움을 해소하고자 AHP 기법을 활용하여 Smart-X 개발의 우선순위 평가 방법론을 개발하고 실증적으로 우선순위를 도출하였다. 전문가 특성에 따른 우선순위의 차이를 분석한 결과, 세 계층으로 이루어진 의사결정 모형에서 학계와 산업계의 우선순위가 유사하게 나타났다. 학계와 산업계는 투입 대비 산출을 중시하여 사업의 실현 가능성과 사업 추진을 통해 얻을 수 있는 부가가치를 중시하는 것으로 분석되었다. 이를 바탕으로 Smart-X 중 스마트헬스케어의 신사업 추진을 가장 중요하게 생각하는 것으로 나타났다. 반면, 공간정보 전문가는 Smart-X 사업 추진의 필요성 및 시급성과 국민들의 수용을 우선순위 판단의 주요 기준으로 삼았으며, 공간정보가 융⋅복합될 시 도시민의 편익이 극대화될 것으로 기대되는 스마트시티의 우선순위를 가장 높게 평가하였다. 본 연구는 융합을 통해 새롭게 등장한 Smart-X를 대상으로 개발 시 고려되어야 할 요소와 개발의 우선순위를 계층적 의사결정방법론(AHP)을 활용하여 분석한 것으로 향후 예비 타당성 조사 등에 정교하고 폭넓은 의사결정을 지원하는 자료로 활용될 수 있는 것으로 기대된다. This study developed a priority evaluation methodology for Smart-X development using AHP techniques and derived empirical priorities to solve unnecessary budget waste and difficulties in creating synergies, mainly caused by the convergence and convergence of technology due to the 4th Industrial Revolution. Analysis of the differences in priorities according to expert characteristics showed similar priorities between academia and industry in a three-tier decision model. Academics and industries are analyzed to value the feasibility of the project and the added value that can be obtained by promoting the project by placing importance on the production of the project. Based on this, it seems that Smart-X is the most important thing to push for a new business for Smart Healthcare. On the other hand, spatial information experts used the necessity, urgency, and acceptance of Smart-X projects as the main criteria for prioritization, and rated Smart City"s priority as the highest expected to maximize the benefits of urban residents when spatial information is converged and combined. This study analyzes factors and priorities to be considered in development of new Smart-X through convergence using a hierarchical decision methodology (AHP), which is expected to be used as data to support sophisticated and wide decision making in future preliminary feasibility studies.
Jin Sung Kim,Kyoungkyg Bae,Eun Ji Lee,Minseo Bang 대한외과학회 2021 Annals of Surgical Treatment and Research(ASRT) Vol.100 No.6
Purpose: Increasing interest in maintaining a positive body image following breast cancer surgery has become an important aspect of reconstruction surgery. Volume matching of the reconstructed breast to natural breasts is the most important consideration. This study aimed to explore the feasibility of using mammography with a fully automated breast volumetric software to measure the preoperative breast volume in patients with breast cancer. Methods: We evaluated patients who underwent a total mastectomy between July 2016 and February 2021. The specimen volume following total mastectomy was compared with breast volume estimates using a fully automated volumetric software (Quantra ver. 2.1.1) and 4 other previously described mammography-based prediction methods. The association between the estimates and mastectomy specimen volume was assessed using Pearson correlation and Bland-Altman analysis. Results: Sixty-six patients were included. Compared with previously described mammography-based methods, Quantra estimates were more strongly correlated with mastectomy specimen volume in the entire, fatty, and dense breast groups (r = 0.920, 0.921, and 0.915, respectively; P < 0.001). In applying Quantra estimates for measuring preoperative breast volume, we adjusted a simple equation: mastectomy specimen volume = Quantra estimate × 0.8. Conclusion: Mammography with a fully automated breast volumetric software can be useful for measuring preoperative breast volume in patients with breast cancer who undergo reconstruction surgery.
Hong, Seong Kyung,Bae, Seonghan,Jeon, Hyungkook,Kim, Minseo,Cho, Seong J.,Lim, Geunbae The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.6
<P>Oil spills and an increasing demand for the treatment of industrial oily wastewater are driving the need for continuous large-scale oil/water separation processes. Herein, we report a nanofibrous cellulosic membrane (NFC membrane) for the continuous high-flux separation of large amounts of oil/water mixtures. The NFC membrane was fabricated using wet electrospinning, a facile yet effective method for stacking nanofibrous membranes with uniform porous structures on a substrate. Owing to its cellulosic nature, the membrane showed excellent underwater superoleophobicity along with robust chemical stability and was able to separate oil/water mixtures at efficiencies exceeding 99%. Repetitive oil/water separations could be performed using a single membrane, during which the oil content in the filtrate remained extremely low (<29 ppm). The nanofibrous membrane exhibited a fine porous structure that was interconnected throughout the membrane, resulting in a high oil intrusion pressure (>30 kPa) that allowed not only gravity-driven but also pressure-driven separation of oil/water mixtures. The separation flux reached 120 000 L m<SUP>−2</SUP> h<SUP>−1</SUP> during pressure-driven separations, which is a very promising feature for actual applications such as the large-scale treatment of industrial oily wastewater.</P>
( Mingyeong Kim ),( Jeryeong Kim ),( Minuk Ha ),( Minseo Bae ),( Juhee Kim ),( Ja-young Goo ),( Soonjae Lee ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
High resolution site characterization (HRSC) can support more effective remediation design and faster site cleanup. Recently, researches on HRSC techniques have conducted in Deokso area, Keonggi-do, Korea. In this research, we investigated the groundwater flow under different geological models constructed based on the detailed lithological and structural borehole log from the adjacent boreholes on the test bed. The conceptual hydrogeological models were constructed with homogeneous layer models as well as heterogeneous models. The homogeneous models were derived by interpolating observed contacts in borehole logs. Heterogeneous models were built by geostatistical simulation of lithology variables and material properties using T-PROGS. Over the generated hydrogeology model, the groundwater flow modeling was conducted using MODFLOW. The simulated groundwater flow field in homogeneous layer models were compared with the simulations in a heterogeneous model made with a T-PROGS tool. The simulation results showed that the groundwater flow varied greatly depending on configuration of the conceptual model as well as the resolution of geological survey data.
Jang, Jaeeun,Lee, Jihee,Lee, Kyoung-Rog,Lee, Jiwon,Kim, Minseo,Lee, Yongsu,Bae, Joonsung,Yoo, Hoi-Jun IEEE 2019 IEEE journal of solid-state circuits Vol.54 No.2
<P>A small form-factor, lightweight wireless capsule endoscope (WCE) system with body channel communication (BCC) transceiver ICs is proposed for VGA-resolution image transferring and capsule localization. The transceiver ICs are composed of capsule chip and receiver chip, implemented in a 65-nm CMOS process. In the capsule side, the proposed system provides 360° image capturing through four-camera integration to reduce the miss rate. Also, a dual-band pulse-shaping BCC transmitter is proposed to enable low-power (<1 mW), high-speed (80 Mb/s) image transmission. In the receiver side, contact attenuation compensated-received signal strength indicator (CAC-RSSI) is proposed to increase the capsule localization accuracy. The external system is composed of eight-receiver nodes that allow signal demodulation and localization of the capsule. To reduce transceiver payload and system power consumption, image encoder is implemented in the capsule. The transceiver IC is integrated into the capsule system and verified with body mimicking phantom. The proposed system satisfies compatibility with medical grade diagnosis by operating longer than 8 h with 4 fps and 12 h with 2 fps with conventional two silver oxide 55-mA · h coin batteries. The tested localization accuracy shows less than sub-centimeter range.</P>