표면적 변화에 기반한 입체적 웨어러블 호흡수 센서의 가능성 탐색

이승표,반현성,이주현 한국감성과학회 2018 감성과학 Vol.21 No.1

This study suggests the sensing method of the Three-dimensional respiration rate sensor based on surface area changes, and exploring the design direction of the three-dimensional breathing sensor and the design orientation of the garment. To achieve this, two types of three-dimensional respiration rate sensor were produced, and the study of the dummy and the subjects studied. The studyⅠ investigated the possibility of measurement of the threedimensional respiration sensor by the study variables of the sensor type and speed of respiration. The studyⅡ proposes a suitable type of sensor for each of the three measuring positions in addition to the study variables in the studyⅠ. To evaluate accuracy, reproducibility, and reliability of the three-dimensional respiration rate sensor, the BIOPAC was used to measure the respiration rate simultaneously with the three-dimensional respiration rate sensor. Through all these results of the experiment, it explored the possibility of measurement of the three-dimensional respiration sensor for the dummy. It also proposed a suitable type of sensor by measuring the respiration rate for the human body. 본 연구에서는 센서의 표면적 변화에 따른 입체적 호흡수 센서의 센싱 방식을 제안하고, 직물 기반의 입체적 호흡수센서의 성능 평가 및 의복에 적용할 수 있는 디자인 방향성을 탐색하고자 한다. 이를 위해 입체적 구조의 차이에따라 2가지 유형의 입체적 호흡수 센서를 제작하고 더미와 인체 대상으로 연구를 실시하였다. 연구Ⅰ은 더미 대상실험으로 센서의 유형 및 호흡 속도의 연구변인에 의해 입체적 호흡수 센서의 측정 가능성을 탐색하였다. 연구Ⅱ는7명의 20대 남성을 대상 실험으로 연구Ⅰ의 연구변인 이외에 3개의 측정 위치별 적합한 유형의 센서를 제안하였다. 입체적 호흡수 센서의 정확도, 재현성, 신뢰도를 평가하기 위해, 의료기기 분야의 대표적 웨어러블 호흡수 센서인 BIOPAC을 사용하여 입체적 호흡수 센서와 동시에 호흡수를 측정하였다. 이상의 연구 결과를 통해 더미 대상으로입체적 호흡수 센서의 측정 가능성을 탐색하였으며, 인체 대상으로 호흡수를 측정하여 측정 위치별 적합한 유형의 센서를 제안하였다.

Multimodality Imaging Can Help to Doubt, Diagnose and Follow-Up Cardiac Mass

이승표,최의근,김태민,박은아,김형관,조현재,오세일 대한심장학회 2011 Korean Circulation Journal Vol.41 No.9

Primary cardiac lymphoma is a very rare form of lymphoma primarily or mainly involving the heart, as in the two cases presented in this report. Various imaging modalities, including coronary computed tomography angiography, cardiac magnetic resonance imaging and positron emission tomography were useful for the characterization and diagnosis of cardiac mass. Pathologic confirmation was successful with endomyocardial biopsy under echocardiographic guidance, intra- and extracardiacally. In primary cardiac lymphoma, diagnosis using multiple modalities may be useful for mass characterization, and for response monitoring after chemotherapy.

A Thief Caught in the Act- Free Floating Venous Thrombus in the Right Heart Associated With Pulmonary Embolism -

이승표,김형관,김송이,오일영,조현재,김용진,손대원 대한심장학회 2011 Korean Circulation Journal Vol.41 No.1

초소형 풍력발전용 블레이드에 대한 구조설계 몇 해석

이승표,강기원,장세명,이장호,Lee, Seung-Pyo,Kang, Ki-Weon,Chang, Se-Myong,Lee, Jang-Ho 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.2

In recent years, wind energy has been the world's fastest growing source of energy. This paper describes the structural design and analysis of composite blade for 2 kW-level HAWT (horizontal axis wind turbine). The aerodynamic design and force, which are required to design and analyze a composite blade structurally, are calculated through BEMT(blade element momentum theory) implemented in public code PROPID. To obtain the equivalent material properties of filament wound composite blades, the rule-of-mixture is applied using the basic material properties of fiber and matrix, respectively. Lay-up sequence, ply thickness and ply angle are designed to satisfy the loading conditions. Structural analysis by using commercial software ABAQUS is performed to compute the displacement and strength ratio of filament wound composite blades.

웨어러블 호흡수 모니터링을 위한 저항 변화형 직물 센서

이승표,구혜란,전동진,이주현 한국감성과학회 2017 춘계학술대회 Vol.2017 No.-

본 연구의 목적은 웨어러블 호흡수 모니터링을 위한 저항 변화형 직물 센서를 개발하는 것이다. 이를 위하여 3D프린터를 사용하여 제작한 구조물에 CNT섬유, 니켈섬유를 부착한 3가지 유형의 직물 센서를 제작하였고, 더미 대상 호흡 모니터링 실험을 통해 호흡 속도 차이에 따른 직물 센서의 측정 가능성을 탐색하였다. 그 결과 본 연구에서 개발된 3가지 센서 모두 호흡수를 효과적으로 센싱할 수 있는 것으로 나타났으며, 의복에 적용하기에 적합한 센서의 구조를 제안하였다. 본 연구는 기존의 센싱 방식에서 벗어나 새로운 호흡 측정 방식을 제안하고, 이를 통하여 호흡수 측정의 가능성을 탐색하였다. * 이 성과는 2016년도 정부(미래창조과학부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임 (No.NRF-2016R1C1B1016042). * 이 논문은 2017년도 BK21플러스 사업(연세대학교 의류환경학과)에 의하여 지원되었음.

상변태를 고려한 베어링의 열처리 변형 해석

이승표,이석재,김태범,조균택 한국열처리공학회 2023 熱處理工學會誌 Vol.36 No.6

Bearings are mechanical components that support loads and transmit rotation. The inner and outer rings come into contact with the rotating mechanism, requiring a very high level of hardness. To meet this requirement, heat treatment is commonly performed. The heat treatment process inherently involves thermal deformation. Particularly in the case of large bearings, significant deformation relative to the bearing's shape can occur, making accurate deformation prediction during heat treatment essential. However, predicting deformation in heat treatment is challenging due to the simultaneous consideration of phase transformation, heat transfer, and bearing deformation. In this study, an analysis of heat treatment-induced deformation in bearings was conducted, taking phase transformation into account. The thermal and mechanical properties were calculated based on the chemical composition of the bearing material. This information was then used to perform a deformation-heat transfer-phase transformation analysis. To validate the reliability of the analysis, experiments were conducted under the same conditions. When comparing the analysis and experimental results, differences in deformation were observed. These differences were attributed to variations in phase transformation conditions between the analysis and experiments. Consequently, it is anticipated that supplementing these results will enable the prediction of deformation while considering phase transformation conditions in bearings.

실험계획법을 이용한 2kW급 풍력발전용 블레이드에 대한 구조설계

이승표,강기원,장세명,이장호 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.1

In this paper, structural design for 2kW class composite blade is performed by using design of experiment(DOE). A full factorial design is applied to meet the design specifications at the manufacturing process. The analysis of variance(ANOVA)is made in order to determine the significance of effects in an analysis. Structural analysis by using of commercial software ABAQUS is performed to compute the displacement and safety factor of filament wound composite blade. The results show that the proposed method is suitable to analyze the factors at the design of wind turbine blade.

초탄성 및 점탄성 물성을 고려한 자동차용 휠 베어링 실의 드래그 토크 예측

이승표 한국트라이볼로지학회 2019 한국윤활학회지(윤활학회지) Vol.35 No.5

Wheel bearings are important automotive parts that bear the vehicle weight and translate rotation motion; in addition, their seals are components that prevent grease leakage and foreign material from entering from the outside of the bearings. Recently, as the need for electric vehicles and eco-friendly vehicles has been emerging, the reduction in fuel consumption and CO2 emissions are becoming the most important issues for automobile manufacturers. In the case of wheel bearings, seals are a key part of drag torque. In this study, we investigate the prediction of the drag torque taking into consideration the hyperelastic and viscoelastic material properties of automotive wheel bearing seals. Numerical analysis based on the finite element method is conducted for the deformation analyses of the seals. To improve the reliability of the rubber seal analysis, three types of rubber material properties are considered, and analysis is conducted using the hyperelastic material properties. Viscoelastic material property tests are also conducted. Deformation analysis considering the hyperelastic and viscoelastic material properties is performed, and the effects of the viscoelastic material properties are compared with the results obtained by the consideration of the hyperelastic material properties. As a result of these analyses, the drag torque is 0.29 Nm when the hyperelastic characteristics are taken into account, and the drag torque is 0.27 Nm when both the hyperelastic and viscoelastic characteristics are taken into account. Therefore, it is determined that the analysis considering both hyperelastic and viscoelastic characteristics must be performed because of its reliability in predicting the drag torque of the rubber seals.

편리한 입력방식의 단조공정해석을 위한 CAMPform3D의 전처리기 개발

이승표,이강수,박성균,이상현 한밭대학교 생산융합기술연구소 2004 생산융합기술연구소 논문집 Vol.4 No.1

Deformation analysis of rubber seal assembly considering uncertainties in mechanical properties

이승표,강기원 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7

Rubber seals are used in the assemblies of mechanical parts in automobiles and aircrafts to prevent lubricant leakage and inclusion of foreign object. Because of the recent increase in the warranty periods of mechanical parts for automobiles, there is a need for longer service lives than those of existing products, and there is an even greater need for performance-related reliability during usage. This study analyzes the deformation behavior of rubber seals, including an overmold, used in the assemblies of mechanical parts. To improve the reliability of the analysis for rubber seal, three types of static experiments on rubber were conducted to obtain rubber properties. The experimental results were used to perform a hyper-elastic analysis considering rubber seal contact. The deformation analysis for rubber seal was performed to predict the performance after the assembling process. Moreover, a Monte Carlo simulation considering the probabilistic distribution of the mechanical properties of the rubber was performed to identify the effect of uncertainties in the rubber properties on deformation behavior of rubber seal. The pre- and post-deformation distributions of the rubber seal assembly were derived from the results of the Monte Carlo simulation, and they were used to evaluate the stability of the mechanical parts during the assembling process.