http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Blood pressure estimation and its recalibration assessment using wrist cuff blood pressure monitor
Youjung Seo,Saehim Kwon,Unang Sunarya,Sungmin Park,Kwangsuk Park,Dawoon Jung,Youngho Cho,Cheolsoo Park 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.2
The rapid evolution of wearable technology in healthcare sectors has created the opportunity for people to measure theirblood pressure (BP) using a smartwatch at any time during their daily activities. Several commercially-available wearabledevices have recently been equipped with a BP monitoring feature. However, concerns about recalibration remain. Pulsetransit time (PTT)-based estimation is required for initial calibration, followed by periodic recalibration. Recalibration usingarm-cuff BP monitors is not practical during everyday activities. In this study, we investigated recalibration using PTT-basedBP monitoring aided by a deep neural network (DNN) and validated the performance achieved with more practical wristcuffBP monitors. The PTT-based prediction produced a mean absolute error (MAE) of 4.746 ± 1.529 mmHg for systolicblood pressure (SBP) and 3.448 ± 0.608 mmHg for diastolic blood pressure (DBP) when tested with an arm-cuff monitoremploying recalibration. Recalibration clearly improved the performance of both DNN and conventional linear regressionapproaches. We established that the periodic recalibration performed by a wrist-worn BP monitor could be as accurate asthat obtained with an arm-worn monitor, confirming the suitability of wrist-worn devices for everyday use. This is the firststudy to establish the potential of wrist-cuff BP monitors as a means to calibrate BP monitoring devices that can reliablysubstitute for arm-cuff BP monitors. With the use of wrist-cuff BP monitoring devices, continuous BP estimation, as wellas frequent calibrations to ensure accurate BP monitoring, are now feasible.
Je, Hyejin,Lee, Sang-Kwon,Jung, Jin-Woo,Jang, Youjung,Chhoey, Saran,Choi, Jihye The Korean Society of Veterinary Science 2020 Journal of Veterinary Science Vol.21 No.2
Background: Computed tomography urography (CTU), based on the excretion of contrast medium after its injection, allows visualization of the renal parenchyma and the renal collecting system. Objectives: To determine the optimal contrast medium dose allocation ratio to apply in split-bolus CTU in dogs. Methods: This prospective, experimental, exploratory study used 8 beagles. In 3-phase CTU, unenhanced-, nephrographic-, and excretory-phase images were obtained with a single injection of 600 mg iodine/kg iohexol. In split-bolus CTU, two different contrast medium allocation ratios (30% and 70% for split CTU 1; 50% and 50% for split CTU 2) were used. Unenhanced phase image and a synchronous nephrographic-excretory phase image were acquired. Results: Although the attenuation of the renal parenchyma was significantly lower when using both split CTUs than the 3-phase CTU, based on qualitative evaluation, the visualization score of the renal parenchyma of split CTU 1 was as high as that of the 3-phase CTU, whereas the split CTU 2 score was significantly lower than those of the two others. Artifacts were not apparent, regardless of CTU protocol. The diameter and opacification of the ureter in both split CTUs were not significantly different from those using 3-phase CTU. Conclusions: Split-bolus CTU with a contrast medium allocation ratio of 30% and 70% is feasible for evaluating the urinary system and allows sufficient enhancement of the renal parenchyma and appropriate distention and opacification of the ureter, with similar image quality to 3-phase CTU in healthy dogs. Split-bolus CTU has the advantages of reducing radiation exposure and the number of CT images needed for interpretation.
Identification of sttH Expressing the Novel Halogenase Enzymes from pseudomonas st.
Byongson YI,Haenggeun CHA,Youjung KONG,Hyeji JIN,Yubin JEON,Byeonguk LEE,Dogyeong KIM,HyunA PARK,Jeongchan LEE,Sang-Kyu JUNG,Kwon-Young CHOI,Byung-Gee KIM,Yung-Hun YANG,Kyungmoon PARK,See-Hyoung PARK 한국생물공학회 2022 한국생물공학회 학술대회 Vol.2022 No.9
고등학생이 이온 결합에 대해 생성한 비유의 특징 분석 -학생의 인지적 특성에 따른 비유의 특징 비교-
김민환 ( Minhwan Kim ),권혁순 ( Hyeoksoon Kwon ),김유정 ( Youjung Kim ),노태희 ( Taehee Noh ) 한국과학교육학회 2017 한국과학교육학회지 Vol.37 No.1
이 연구에서는 고등학교 학생들이 이온 결합에 대해 생성한 비유의 특징을 비유 생성 개수와 대응 관계 이해도, 비유의 소재와 유형의 측면에서 분석하고, 이 결과를 학생들의 개념 이해도와 논리적 사고력, 비유 추론 능력에 따라 비교하였다. 서울특별시에 소재한 5개 고등학교에 재학 중인 2학년 학생 395명이 연구에 참여하였다. 연구 결과, 개념 이해도, 논리적 사고력, 비유 추론 능력이 높을수록 학생들은 비유를 더 많이 생성하는 것으로 나타났다. 생성한 비유에 대한 대응 관계 이해도는 논리적 사고력과 비유 추론 능력만 관계가 있었다. 학생들이 비유를 생성하기 위해 활용하는 소재는 조사한 인지적 특성 중 목표 개념에 대한 이해도에 따라서만 다르게 나타났다. 또한, 개념 이해도가 높을수록 다양한 소재를 활용하여 비유를 생성하였다. 학생들이 생성한 비유의 유형은 일부 인지적 특성과 관련이 있었다. 예를 들어, 개념 이해도와 논리적 사고력이 높은 학생들이 글과 그림을 모두 사용한 비유를 더 많이 생성하였다. 작위성과 추상도, 체계성의 측면에서 비유의 유형은 인지적 특성과 관련이 없었다. 이상의 결과를 바탕으로 교육적 함의를 논의하였다. In this study, we investigated the characteristics of analogs generated by high school students to explain ionic bonding in the perspectives of the number of analogs, the understanding of mapping, and the source and type of analogs. We also compared the results by students` conceptual understanding, logical thinking ability, and analogical reasoning ability. Participants in this study were 395 11th graders in Seoul. The results of the study showed that the higher the conceptual understanding, the logical thinking ability, and the analogical reasoning ability, the more the students generated the analogs. The understanding of mapping was related to logical thinking ability and analogical reasoning ability. It is noteworthy that the sources of analogs differed only depending on their conceptual understanding of the target concept among the cognitive variables studied. Students who had higher conceptual understanding also generated analogs from more diverse sources. Some types of the generated analogs were related to the cognitive variables. For examples, the students who had higher conceptual understanding and logical thinking ability generated more verbal/pictorial analogs. The types of analogs were not related to cognitive variables in terms of artificiality, abstraction, and systemicity. Educational implications of these findings were discussed.