• 제목/요약/키워드: High-sensitivity

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Effects of Dietary Modification on Plasma Glucose and Insulin Sensitivity in Streptozotocin-induced Diabetic Rats

  • Choi, Hyun-Ju
    • Journal of Nutrition and Health
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    • 제30권9호
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    • pp.1035-1044
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    • 1997
  • There is substantial evidence that insulin sensitivity can be enhanced through appropriate dietary management . In this study, insulin sensitivity was evaluated using and insulin suppression test. Male Sprague-Dawley rats, were caused to be in a diabetic condition by the injection of streptozotocin, and divided into four groups. They were fed one of the following diets for 2 weeks : (group 1) a high-carbohydrate(CHO) low-fat low-fiber diet, (group 2) a high CHO low-fat and high-fiber diet, (group 3) a low-CHO high-fat and low-fiber diet, and (group 4) a low-CHO low-fat diet groups (as comparison between group 1 and group 2 shows). In the low-CHO high-fat diet groups, dietary fiber tended to decrease plasma glucose levels at the end of the experiment, but not significantly (as comparison between group 3 and group 4 shows). The average steady state plasma glucose level in rats on the group 3 diet was the highest among all four groups(p<0.05), indicating the poorest insulin sensitivity . However, high fiber increased insulin sensitivity in rats on the low-CHO high-fat diets(as shows by a comparison between group 3 and group 4). On the other hand , the high-CHO low-fat enhanced insulin sensitivity in rats on the low fiber diet(group 1 and group 3). The degree of enhancement of insulin sensitivity depends on the combination of CHO, fat , and fiber in the diet. In conclusion, this study demonstrates that a low-CHO high-fat low -fiber diet may be deleterious to diabetic rats. In view of insulin sensitivity enhancement , dietary fiber level is irrelevant, as long as the diet has a high-CHO and low-fat level.

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Conceptual Study of Brain Dedicated PET Improving Sensitivity

  • Shin, Han-Back;Choi, Yong;Huh, Yoonsuk;Jung, Jin Ho;Suh, Tae Suk
    • 한국의학물리학회지:의학물리
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    • 제27권4호
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    • pp.236-240
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    • 2016
  • The purpose of this study is to propose a novel high sensitivity neuro-PET design. The improvement of sensitivity in neuro-PET is important because it can reduce scan time and/or radiation dose. In this study, we proposed a novel PET detector design that combined conical shape detector with cylindrical one to obtain high sensitivity. The sensitivity as a function of the oblique angle and the ratio of the conical to cylindrical portion was estimated to optimize the design of brain PET using Monte Carlo simulation tool, GATE. An axial sensitivity and misplacement rate by penetration of ${\gamma}$ rays were also estimated to evaluate the performance of the proposed PET. The sensitivity was improved by 36% at the center of axial FOV. This value was similar to the calculated value. The misplacement rate of conical shaped PET was about 5% higher than the conventional PET. The results of this study demonstrated the conical detector proposed in this study could provide subsequent improvement in sensitivity which could allow to design high sensitivity PET for brain imaging.

Analytical Model of Double Gate MOSFET for High Sensitivity Low Power Photosensor

  • Gautam, Rajni;Saxena, Manoj;Gupta, R.S.;Gupta, Mridula
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제13권5호
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    • pp.500-510
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    • 2013
  • In this paper, a high-sensitivity low power photodetector using double gate (DG) MOSFET is proposed for the first time using change in subthreshold current under illumination as the sensitivity parameter. An analytical model for optically controlled double gate (DG) MOSFET under illumination is developed to demonstrate that it can be used as high sensitivity photodetector and simulation results are used to validate the analytical results. Sensitivity of the device is compared with conventional bulk MOSFET and results show that DG MOSFET has higher sensitivity over bulk MOSFET due to much lower dark current obtained in DG MOSFET because of its effective gate control. Impact of the silicon film thickness and gate stack engineering is also studied on sensitivity.

Flexible Pressure Sensors Based on Three-dimensional Structure for High Sensitivity

  • Jung, Young;Cho, Hanchul
    • 센서학회지
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    • 제31권3호
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    • pp.145-150
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    • 2022
  • The importance of flexible polymer-based pressure sensors is growing in fields like healthcare monitoring, tactile recognition, gesture recognition, human-machine interface, and robot skin. In particular, health monitoring and tactile devices require high sensor sensitivity. Researchers have worked on sensor material and structure to achieve high sensitivity. A simple and effective method has been to employ three-dimensional pressure sensors. Three-dimensional (3D) structures dramatically increase sensor sensitivity by achieving larger local deformations for the same pressure. In this paper, the performance, manufacturing method, material, and structure of high-sensitivity flexible pressure sensors based on 3D structures, are reviewed.

가격민감도와 번들할인 유형, 남성화장품의 가격수준이 품질지각에 미치는 영향 (The Influence of Price Sensitivity, Bundle Discount Type and Price Level of Male Cosmetics on Quality Perception)

  • 김근정;황선진
    • 복식
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    • 제66권2호
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    • pp.1-14
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    • 2016
  • This study was intended to investigate the influences that consumer's price sensitivity, bundle discount type, and price level of the male cosmetics have on consumer attitude. The design of this research was comprised of $2{\times}2{\times}2$ mixed design studies. The first element was high price sensitivity vs. low sensitivity, the second element was the bundle discount type (mixed leader vs. mixed-joint), and the third element was the price level of male cosmetics (high-price brand vs. low-price brand). The results of this study showed that price sensitivity, bundle discount type and price level of male cosmetic had a statistically significant interaction effect on the consumer's quality perception. The quality perception of low-cost brands for high price sensitivity/mixed-joint bundle group was low. The quality perception of low-cost brands for mixed-leader bundled groups did not change significantly even when the price sensitivity became higher. However, it can be seen as the same result that the overall value is higher when suggested the price information in Mixed-leader bundle than Mixed-joint bundle. In particular, this study suggests that price information should be presented in mixed-leader bundles for high price sensitivity and low cast brands.

불안민감도가 과제 수행과 스트레스 반응에 미치는 영향: 우울감의 조절효과 (The Influence of Anxiety Sensitivity on Task Performance and Stress Response: The Moderating Effect of Depression)

  • 김소리;이정현
    • 스트레스연구
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    • 제27권2호
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    • pp.199-204
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    • 2019
  • 본 연구는 불안민감도가 과제수행과 스트레스 반응에 미치는 영향을 살펴보고, 이 과정에 우울감은 어떠한 영향을 미치는지 확인하였다. 참가자들은 제한된 시간에 암산 문제를 완수하였고, 불안민감도지수와 우울증 선별도구에 응답하였다. 더불어, 실험 전후 참가자들의 코르티졸(Cortisol) 변화량을 확인하였다. 그 결과, 불안민감도가 높은 사람은 과제수행의 정확도가 떨어지고 코르티졸 수치가 유의미하게 상승하였다. 또한, 불안민감도와 우울감이 모두 높은 참가자들이 코르티졸 수치가 가장 크게 상승하였다. 본 연구는 자기보고식 응답에 근거하여 임상증상을 기술하는 것을 넘어 과제수행의 정확도와 생화학적 지표를 함께 제시함으로써, 보다 안정적으로 개인의 불안민감도와 우울감의 관계를 논의하였다는 의의를 지닌다.

Photocurrent Characteristics of Gate/Body-Tied MOSFET-Type Photodetector with High Sensitivity

  • Jang, Juneyoung;Choi, Pyung;Lyu, Hong-Kun;Shin, Jang-Kyoo
    • 센서학회지
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    • 제31권1호
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    • pp.1-5
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    • 2022
  • In this paper, the photocurrent characteristics of gate/body-tied (GBT) metal-oxide semiconductor field-effect transistor (MOSFET)-type photodetector with high sensitivity in the 408 nm - 941 nm range are presented. High sensitivity is important for photodetectors, which are used in several scientific and industrial applications. Owing to its inherent amplifying characteristics, the GBT MOSFET-type photodetector exhibits high sensitivity. The presented GBT MOSFET-type photodetector was designed and fabricated via a standard 0.18 ㎛ complementary metal-oxide-semiconductor (CMOS) process, and its characteristics were analyzed. The photodetector was analyzed with respect to its width to length (W/L) ratio, bias voltage, and incident-light wavelength. It was confirmed experimentally that the presented GBT MOSFET-type photodetector has over 100 times higher sensitivity than a PN-junction photodiode with the same area in the 408 nm - 941 nm range.

Midinfrared Refractive-index Sensor with High Sensitivity Based on an Optimized Photonic Crystal Coupled-cavity Waveguide

  • Han, Shengkang;Wu, Hong;Zhang, Hua;Yang, Zhihong
    • Current Optics and Photonics
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    • 제5권4호
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    • pp.444-449
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    • 2021
  • A photonic crystal coupled-cavity waveguide created on silicon-on-insulator is designed to act as a refractive-index-sensing device at midinfrared wavelengths around 4 ㎛. To realize high sensitivity, effort is made to engineer the structural parameters to obtain strong modal confinement, which can enhance the interaction between the resonance modes and the analyzed sample. By adjusting some parameters, including the shape of the cavity, the width of the coupling cavity, and the size of the surrounding dielectric columns, a high-sensitivity refractive-index sensor based on the optimized photonic crystal coupled-cavity waveguide is proposed, and a sensitivity of approximately 2620 nm/RIU obtained. When an analyte is measured in the range of 1.0-1.4, the sensor can always maintain a high sensitivity of greater than 2400 nm/RIU. This work demonstrates the viability of high-sensitivity photonic crystal waveguide devices in the midinfrared band.

교사-부모 협력과 교사-영아 상호작용 간의 관계에서 영아반 교사의 민감성의 매개효과 (The Mediating Effect of Child Care Teacher's Sensitivity in the Relationship Between Teacher-Parent Partnership and Teacher-Infant Interactions)

  • 박보경;박선영;이시은
    • 한국보육지원학회지
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    • 제20권1호
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    • pp.73-89
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    • 2024
  • Objective: The purpose of this study was to examine the effect of communication and cooperation between teachers and parents on infant care. Specifically, this study explored the direct effect of teacher-parent partnership on teacher-infant interactions and the indirect effect through teacher sensitivity. Methods: The participants of this study were 216 teachers in charge of infant classes at child care centers located in Gyeonggi-do. They responded to questionnaires on teacher-parent partnership, their sensitivity, and teacher-infant interactions. Data were analyzed using structural equation modeling. Results: First, teacher-parent partnership did not have a direct impact on teacher-infant interactions. Second, teacher-parent partnership indirectly influenced teacher-infant interactions through teacher sensitivity. In other words, a high level of teacher-parent partnership was associated with a high level of sensitivity, subsequently resulting in the provision of high-quality interactions for infants. Conclusion/Implications: This study confirmed the role of teacher sensitivity as a mechanism to explain how teacher-parent partnership is linked to teacher-child interactions. The results emphasize the importance of communication and cooperation between teachers and parents in enhancing teachers' sensitivity and, ultimately, providing high-quality child care to infants.

유연 디스크를 위한 고감도 엑추에이터 개발 (Development of High Sensitivity Actuator for Flexible Disk)

  • 송명규;김충;이동주;박노철;박영필
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2005년도 추계학술대회논문집
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    • pp.577-580
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    • 2005
  • This paper reports the high sensitivity actuator for flexible disk. The air stabilized flexible optical disk has very small axial runout. Therefore, It is proper to develop an actuator which has high sensitivity in tracking direction rather than in focusing direction. In order to maximize driving force in radial direction, we present an efficient design of magnetic circuit with simple multi-polarized magnets and auxiliary magnets. Designed magnetic circuit has big force in tracking direction. And we shift 2$^{nd}$ resonance frequency of moving parts Into high frequency band, not causing increase of mass and discord between force and mass centers to secure high sensitivities and sufficient control bandwidth. Finally, experimental results show that designed actuator has superior sensitivity in tracking direction.

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