• 동의생리병리학회지
• /
• 제34권1호
• /
• pp.30-36
• /
• 2020

This study aimed to investigate heart rate variability (HRV) characteristics of cold pattern with repeated measurement data. Participants were taken from a Daejeon University cohort study from 2015 to 2018. Forty-seven of the participants studied displayed cold pattern while 23 showed signs of non-cold pattern. HRV was measured in supine position for 5 minutes at each year, and an 8-item cold pattern questionnaire was used for the diagnosis of cold pattern. SDNN (standard deviation of the NN intervals) and RMSSD (the square root of the mean squared differences of successive NN intervals) were used as time domain analysis, and TP (total power), VLF (power in very low frequency range), LF (power in low frequency range), HF (power in high frequency range), LF norm (LF power in normalized units), HF norm (HF power in normalized units) and LF/HF were used as frequency domain analysis. In the Mann-Whitney U test, LF norm, HF norm, and LF/HF showed differences between the cold pattern group and non-cold pattern group at every measurement, and in the independent t-test, the differences were also observed at three points except for the baseline (2015). In the repeated measures ANOVA, the interaction effects were not observed in all HRV parameters, but the time period effects were observed in SDNN, RMSSD, TP, VLF, LF and HF. There were significant differences between those two groups in LF norm, HF norm and LF/HF. This study suggests that LF norm, HF norm and LF/HF might be a useful indicator of cold pattern properties.

• 한국의류산업학회지
• /
• 제22권1호
• /
• pp.11-24
• /
• 2020

This research examines pattern production of 3 men's costumes in the second half of 19th century by 3D reconstruction to reveal technical aspects of mail costumes. The steps are as follows. First, an examination of selective type according to research study. Second, a pattern analysis of 3 historical male tops of 19th century referred to 9 pattern books of the France National Library collection. Third, a categorized type analysis that referred to paintings of the Musée d'Orsay collection. Fourth, a measurement and structure research of 3 historical garments of Fashion and Textile Museum collection. Fifth, the pattern making and fitting by 3D simulation. Research discussed the following subjects and results. First, main type of men's coat can be categorized by frac, redingote, jaquette, and veston. Second, the male costume pattern contained in pattern books was researched along with distinguished silhouettes and structures; X silhouette for frac and redingote, H silhouette for jaquette, and straight box silhouette for veston. Third, based on the analysis of representative type of men's costume per period conducted previous studies, 2 redingotes and a jaquette in the museum were selected and compared to other data such as image materials. Last, the following process was conducted for reconstruction; 'Drawing diagram-Primary pattern drafting by measurement value-3D virtual fitting-Checking the fit-Modification and complement'. We also obtained a 3D virtual reconstruction and a 2D research pattern that suggested a costume pattern by each type along with 3D reconstruction that included insights for male coat techniques of 19th century France.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 춘계학술대회논문집A
• /
• pp.108-113
• /
• 2001

Recently, the mechanical structures applied to many industrial products, especially in electronic products, appear to be miniaturized and complicated. This trend makes it difficult to analyze the stress distribution of those mechanical structures and generates new challenges for precise measurement of strain. Therefore, generally most of those cases largely depend on the finite element analysis. But the development of optical metrology which has the capability of non-contact, full-field and precise measurement makes it possible to solve these measuring problems. Among the optical measurement techniques, the electronic speckle pattern interferometry (ESPI) has been developed and considered as one of the most useful tools for measuring displacement and deformation. But the shortage of recognition and difficulties of measurement have limited its industrial applications in spite of its excellent capabilities. Therefore in this study, in order to enhance the industrial application of ESPI, the measurement of in-plane displacement of mechanical structure with ESPI, which is applied to washing machine and cannot be measured by strain gauges, was performed. And the verification of validity of FEA results was also done.

• 동력기계공학회지
• /
• 제17권5호
• /
• pp.121-127
• /
• 2013

In this paper, we propose a distance measurement system for automatic berthing control using a stereo camera mounted on a rotation control device, and a radial pattern target. Automatically controlling the position and attitude of a ship aims to prevent maritime accidents due to human error. Our goal is to measure the relative distance between a ship and an onshore or offshore target for berthing. Therefore, the distance should be continuously measured while tracking a fixed point on a target. To this end, we developed a stereo camerabased distance measurement system that satisfied these requirements. This paper describes the structure and principle of the measurement system. We validate the distance error for target incline due to the relative position and attitude between a camera and a target in miniature scale. In addition, the findings of an experiment in an outdoor environment demonstrate that the proposed measurement system has accuracy within 1 m at a range of 20-100 m which is the acceptable accuracy for automatic berthing.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2000년도 하계학술대회 논문집 C
• /
• pp.1957-1959
• /
• 2000

The PD measurement method is very useful to detect insulation degradation. Recently, the HFPD(High Frequency Partial Discharge) measurement testing is widely used in partial discharge measurement of HV machines because HFPD measurement testing receives less influence of external noise and has a merit of good sensitivity. Therefore it is very useful method compare to previous conventional PD testing method and effective diagnosis method in power transformer that requires in-service diagnosis. But partial discharges have very complex characteristics of discharge pattern so it is required continuous research to development of precise analysis method. In this study, simulated transformer is manufactured and HFPD occurred from simulated transformer is measured with broad band antenna and active-line RF measurement system in real time, the degradation grade of transformer is analyzed through produced patterns in simulated transformer according to applied voltages. Also the PD pattern which was measured with EMC analyzer and RF measurement system is compared.

• Smart Structures and Systems
• /
• 제12권3_4호
• /
• pp.363-379
• /
• 2013

Dynamic displacement of structures is an important index for in-service structural condition and behavior assessment, but accurate measurement of structural displacement for large-scale civil structures such as long-span bridges still remains as a challenging task. In this paper, a vision-based dynamic displacement measurement system with the use of digital image processing technology is developed, which is featured by its distinctive characteristics in non-contact, long-distance, and high-precision structural displacement measurement. The hardware of this system is mainly composed of a high-resolution industrial CCD (charge-coupled-device) digital camera and an extended-range zoom lens. Through continuously tracing and identifying a target on the structure, the structural displacement is derived through cross-correlation analysis between the predefined pattern and the captured digital images with the aid of a pattern matching algorithm. To validate the developed system, MTS tests of sinusoidal motions under different vibration frequencies and amplitudes and shaking table tests with different excitations (the El-Centro earthquake wave and a sinusoidal motion) are carried out. Additionally, in-situ verification experiments are performed to measure the mid-span vertical displacement of the suspension Tsing Ma Bridge in the operational condition and the cable-stayed Stonecutters Bridge during loading tests. The obtained results show that the developed system exhibits an excellent capability in real-time measurement of structural displacement and can serve as a good complement to the traditional sensors.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2016년도 추계학술대회
• /
• pp.389-392
• /
• 2016

기술이 발전하면서 카메라를 통해 3D 측정을 하는 방법은 계속 발전되어 왔다. 3D 측정을 하는데 있어서 신경 써야 할 요소로는 속도, 정확성, 쉬운 구현 등이 있다. 최근 들어서는 여러 주기의 Fringe pattern을 이용한 측정 방법이 나왔고 많이 쓰이고 있는 추세이다. 이 방법은 일반적으로 프로젝터를 통해 사인파를 뿌려서 얻은 영상으로 높이를 측정하는 방법이다. 이때 사인파를 소프트웨어적으로 생성하여 뿌리는데, 생성된 패턴은 완벽한 사인파일지라도 프로젝터로 뿌릴 때는 감마에 의해서 완벽한 사인파가 될 수가 없다. 이것은 높이 측정에 악영향을 주어, 보다 정확한 높이를 측정할 수 없게 한다. 따라서 본 논문에서는 감마 영향을 받지 않기 위해 사인파의 위상에 대한 보정 방법을 제안한다. 이 방법을 통하여 보다 정확한 높이 측정을 할 수 있을 것이다.

• 한국전자파학회논문지
• /
• 제22권12호
• /
• pp.1155-1164
• /
• 2011

본 논문에서는 국내 최초로 개발되는 함상용 중거리 레이더에 사용되는 능동 위상 배열 안테나의 송신 빔 특성을 근접 전계 시험으로 측정하는 방안에 대하여 제시하였다. 측정하고자 하는 능동 위상 배열 안테나는 고출력 송신 빔을 펄스 형태로 방사하기 때문에 저출력의 연속적인 파형을 사용하는 일반적인 근접 전계 시험 시설에서는 측정하기 어렵다. 그래서 본 논문에서는 고출력 송신 시에도 견딜 수 있도록 설계된 근접 전계 시험 시설과 펄스 모드 측정을 지원하는 Agilent사의 PNA-X 네트웍 분석기를 이용한 근접 전계 시험으로 펄스 형태의 고출력 송신 빔을 방사하는 능동 위상 배열 안테나를 측정하는 방안에 대하여 제시하였고, 실제 개발된 능동 위상 배열 안테나의 고출력 송신 빔 패턴을 근접 전계 시험으로 측정하였다. 또한, 능동 위상 배열 안테나의 송신 특성인 EIRP(Effective Isotropic Radiated Power)를 측정하였고, 수학적인 계산을 통해 예측한 EIRP 값과 비교한 결과 0.1 dB의 오차 내에서 동일함을 확인하였다.

• 대한한방내과학회지
• /
• 제30권1호
• /
• pp.200-211
• /
• 2009

There are many reports about correlations between meteorological elements and stroke. In Oriental medicine, it is recognized that the weather affects the human body and diseases, but there are few studies about the correlation between meteorological elements and pattern identification of stroke. 105 stroke patients classified into fire-heat pattern or dampress-phlegm pattern were registered during the study period. We took the measurement of each meteorological element (atmospheric pressure, temperature, humidity, wind speed) according to pattern identification and analyzed pattern identification into two groups according to mean of each meteorological element during the study period. Mean temperature was higher with the heat-fire pattern than with the dampness-phlegm pattern. Heat-fire pattern also had higher frequency when temperature was higher than mean temperature. There was no correlation between atmospheric pressure, relative humidity, or wind speed and pattern identification.

• 복식문화연구
• /
• 제19권6호
• /
• pp.1205-1220
• /
• 2011

The purpose of this study is to verify the change of body posture by putting on the late $19^{th}$ century English women's bodice or waistcoat. This study analyzed the female somatotype which puts on upper garments of Victorian era with using 3D body scan technology. Two sets of $19^{th}$ century women's bodice and waistcoat patterns were developed with the $19^{th}$ century model size and those patterns were used for making the experimental garments. The fit of experimental garments was evaluated by the degree of change with posture and waist measurements. Three women with the same waist girth measurements with the model size were participated to the fitting test. The postural change was measured from cross-sectional body diagrams. The result of this study showed that the waist measurement of the late $19^{th}$ century English women's bodice and waistcoat pattern was smaller than the waist girth measurement. These garments compressed the midriff of the body and it made women's distinct body silhouette. The waist girth measurement of 1876 bodice pattern was 9.2cm smaller than presented model size. The subjects' waist girth measurements were shortened by 5.0~6.1cm after wearing the 1876 bodice garment. The waist girth measurement of 1880 waistcoat pattern was 7.1cm smaller than presented model size. The subjects' waist girth measurements were shortened by 2.7~3.7cm after wearing the 1880 waistcoat garment. The back side parts of their waist were compressed and their postures were changed. The neck and shoulders were moved forward after wearing the experimental garments. These results showed that body posture could be changed to "S" shape silhouette as wearing the late $19^{th}$ century English women's bodice or waistcoat.