• Title, Summary, Keyword: Parts Count Analysis

Search Result 21, Processing Time 0.029 seconds

A Study on a Algorithm of Gait Analysis and Step Count with Pressure Sensors (보행수 측정 및 보행패턴 분류 알고리즘)

  • Do, Ju-pyo;Choi, Dae-yeong;Kim, Dong-jun;Kim, Kyung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.66 no.12
    • /
    • pp.1810-1814
    • /
    • 2017
  • This paper develops an approach to the algorithm of Gait pattern Analysis and step measurement with Multi-Pressure Sensors. The process of gait consists of 8 steps including stance and swing phase. As 3 parts of foot is supporting most of human weight, multiple pressure sensors are attached on the parts of foot: forefoot, big toe, heel. As 3 parts of foot is supporting most of human weight, multiple pressure sensors are attached on the parts of foot: forefoot, big toe, heel. normal gait proceed from heel, forefoot and big toe over time. While normal gait proceeds, values of heel, forefoot and big toe can be changed over time. So Each values of pressure sensors over time could discriminate whether it is normal or abnormal gait. Measuring Device consists of non-inverting amplifiers and low pass filter. Through timetable of values, normal gait pattern can be analyzed, because of supported weight of foot. Also, the peak value of pressure can judge whether it is walking or running. While people are running, insole of shoes is floating in the air on moment. Using this algorithm, gait analysis and step count can be measured.

Reliability Analysis of the 300 W GaInP/GaAs/Ge Solar Cell Array Using PCM

  • Shin, Goo-Hwan;Kwon, Se-Jin;Lee, Hu-Seung
    • Journal of Astronomy and Space Sciences
    • /
    • v.36 no.2
    • /
    • pp.69-74
    • /
    • 2019
  • Spacecraft requires sufficient power in orbit to perform its mission. So as to comply with system requirements, the sufficient power should be made by a solar cell array by photovoltaic power conversion. A life time of space program depends on its mission considering parts reliability and parts grade. Based on the mission life time, power equipment might be designed to meet specifications. In outer space, solar cell array might generate the dc power by photovoltaic conversion effects and GaInP/GaAs/Ge solar cells are used in this study. Space programs that require more than five years should select parts for high reliability applications. Therefore, reliability analysis for high reliability applications should be performed to check its fulfilment of the requirements. This program should also require more five years for its mission and we performed its analysis using parts count method (PCM) for its reliability. Finally, we performed reliability analysis and obtained quantitative figures found out 99.9%. In this study, we presented the reliability analysis of the 300 W GaInP/GaAs/Ge solar cell array.

Analysis of Types of Gather Drape with Visual Evaluation (시각적 평가에 의한 개더 드레이프 형상 분석)

  • Lee Myung-Hee;Jung Hee-Kyeong
    • Journal of the Korea Fashion and Costume Design Association
    • /
    • v.7 no.1
    • /
    • pp.33-40
    • /
    • 2005
  • Gathering is method used to control fullness along a seam line. The purpose of this study was to investigate the relationship between the quantitative research and qualitative method; the effect of gather and the types of gather drape. The experimental design consists of four factors: (l) three kinds of different weight and thickness of fabrics (2) three kinds of stitch densities (3) five kinds of ratio of gathers (4) three kinds of grain directions. Therefore one hundred thirty five (135) samples were made. And utilized SPSS WIN 10.0 Package in data analysis. The results of this study were as follows; First, after frequency analysis, side height, hem line width, node depth, node count, node width accorded with these result data recording. Second, after correlation analysis, side height related with front statements. Side height and entire visual was negative correlation. Hem line width, node depth, node count with section statements was negative correlation but node width at section statements was positive correlation. Third, after $k^2$ analysis, front picture parts getting excellent evaluation were 1st side height, 3rd hem line width, 4th node depth, 3rd node count, 3rd node width. And section illustration parts getting excellent evaluation were 4th side height, 1st hem line width, 2nd node depth, 3rd node count, 4th node width.

  • PDF

An Application of the Statistical Energy Analysis for Absorbing and Soundproofing Materials of Vehicle (자동차용 흡.차음재의 성능분석을 위한 통계적 에너지 기법의 적용)

  • Lee, Chang-Myung;Lee, Jun;Kim, Dae-Gon
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.13 no.1
    • /
    • pp.33-39
    • /
    • 2003
  • Interior parts of a vehicle are getting important to reduce interior noise. Therefore, prior analysis of cabin noise related with interior parts are necessary at first design stage. Recently, Statistical Energy Analysis(SEA) has been suggested as a possible way for high frequency range noise analysis of interior parts. The validity of noise analysis with SEA to interior parts has been preyed by comparing with experimental result, and the developed method with SEA has been applied in finding optimized interior parts package.

An application of the Statistical Energy Analysis for Absorbing and Soundproofing Materials of Vehicle (자동차용 흡.차음재의 성능분석을 위한 통계적 에너지 기법 적용의 검정)

  • Lee, Chang-Myung;Lee, Jun;Kim, Dae-Gon;Jung, Byoung-In
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.1109-1113
    • /
    • 2001
  • Interior parts of a vehicle are getting important to reduce interior noise of car. Therefore, prior analysis of cabin noise related with interior parts are necessary at first design stage. Recently, Statistical Energy Analysis(SEA) has been suggested as a possible way for meddle of high frequency range analysis with interior parts. This article introduces an example of the application of SEA to predict air born noise of cabin of car.

  • PDF

Abnormal condition analysis of compressor using AE raw signal (AE 원신호를 이용한 압축기의 이상상태 분석)

  • 김전하;이기용;김정석;이감규
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • /
    • pp.365-368
    • /
    • 1995
  • Rotary Compressor has many AE(Acoustic Emission) sources according to condition of parts because it is operated with combination of various parts. In this study, analysis of AE raw signal generated form Rotary compressor which artificially-made parts inflicted abnormal condition was carried out. AE raw signals were acquired form high-speed A/D board, and many burst type signals were observed. By analyzing burst type signals which is caused form internal AE source,efficient AE parameters for monitoring and diagnosis were presented.

  • PDF

An application plan of NSWC-98/LE1 when predicting the reliability of mechanical components of design and development phase (체계 개발 단계별 기계 부품에 대한 신뢰도 예측 시 NSWC-98-LE1 적용 방안)

  • Kwon, Ki Sang;Park, Eun Sim;Cho, Cha Hyun;Lee, Dong Woo;Lee, Su Jung
    • Journal of the Korea Society of Systems Engineering
    • /
    • v.4 no.1
    • /
    • pp.35-43
    • /
    • 2008
  • Generally, in analysis of reliability of Design and Development Phase, reliability of electrical components is analyzed based on standards such as MIL-HDBK-217F, Bellcore Issue 4,5,6 by analyzing stress of architectural side (Power, Voltage, Current and quality level of components) of weapon system and stress of operational side (operational environment, operational temperature, Operational Profile). But the reliability of mechanical components is analyzed based on the data book of failure history of mechanical parts called NPRD-95(Nonelectronic Parts Reliability Data-95) without any analysis of above stress. However, even if it's the same mechanical parts, it might have different failure rate(fatigue, wear, corrosion) during operation depending on how weary(stress : pressure, vibration, temperature during operation) the parts are. Therefore, analyzing reliability using just data book can cause big difference in reliability instead of analyzing based upon stressfulness that parts might have, operational concept, and other various factors. Thus, This paper will guide the way of predicting reliability by organizing ways of predicting reliability for system organization and adopt ing NSWC-98/LE1(Naval Surface Warfare Center-98/LE1) for mechanical components.

  • PDF

Characteristics of Surface Roughness through Fractal Dimension Analysis in End milling (엔드밀 가공에서 프랙탈 차원 해석을 통한 표면 거칠기의 특성)

  • 최임수;이기용;이득우;김정석
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • /
    • pp.1083-1087
    • /
    • 1997
  • End milling is available for machining the variable shape of products and has brrn widely applied in many Manufacturing industries. The surface finish of machined parts determines quality and functionality of products. Surface roughness causes friction,noise,fracture, glossiness and seizure, so many research had been performed to precisely. In particular an experimental analysis was carried out to investigate the influence ofsurface roughness on the fractal dimension. This parameter was assumed to contain not only information of roughness but also extra meaning. Experiments which were performed under various cutting conditions to compare fractal dimension with surface roughness R /sab a/ show fractal dimension to be useful parameter for determining of roughness.

  • PDF

The Evaluation for the Design & Satisfaction of the School Uniform in Girls' High School - Focusing on Ulsan - (여고생의 착용교복에 대한 디자인 평가 및 교복 만족도 - 울산지역을 중심으로 -)

  • Han, Mi-Hee;Lee, Eun-Sook
    • Journal of the Korea Fashion and Costume Design Association
    • /
    • v.16 no.4
    • /
    • pp.177-188
    • /
    • 2014
  • This research is aimed at analyzing the evaluation for the design and satisfaction/unsatisfaction of the autumn and winter school uniform targeting junior students and sophomore students at academical and vocational high schools located in Ulsan, Korea. For this research, SPSS 12.0 was used to measure the frequency and the t-test analysis of 396 data. The results of this study are as follows. The most important factor of autumn-winter school uniforms was heat-retainment. It was showed significant differences between sphere and grade. They also answered body shape' faults and figure emphasis as the most distressed factors. In the design of the school uniform, It was not show significant differences between sphere and grade. They considered the silhouette when they worn the school uniform as the most important factor. The primary factors in purchasing a uniform appeared to be price. Repair experiences after purchasing a school uniform found to count more among students. Examination about transformed parts of uniforms for the students with experiences in uniform modification showed that many students in the academic sphere modified length and width of upper wears, and length of skirt, while many students in the vocational sphere modified waist and hip. Junior grade than sophomore grade appeared to have modified in all parts.

  • PDF

Case Study on Improvement of Reliability Prediction Accuracy in Development Phase for Aircraft (항공기 개발단계에서의 신뢰도 예측 정확도 향상에 관한 사례연구)

  • Kim, Young-Il;Byun, Kwang-Sik;Kim, Han-Tai
    • Journal of the Korean Society for Aviation and Aeronautics
    • /
    • v.17 no.4
    • /
    • pp.25-31
    • /
    • 2009
  • In development phase of the Aircraft Systems, the reliability prediction of electronic equipments are usually performed using MIL-HDBK-217. The reliability of fielded electronic systems, however, used to be underestimated with MIL-HDBK-217. To solve this problem, some alternatives are suggested and Telcordia SR-332 is among them. In this case study, the reliability of ESU which controls gas turbine engine is predicted using Telcordia SR-332 along with the development test data. The predicted reliabilities of ESU using Telcordia SR-332 and MIL-HDBK-217 are also compared. As a result this case study showed that the predicted reliability using Telcordia SR-332 was better close to field(operation) reliability than MIL-HDBK-217.

  • PDF