• 제목/요약/키워드: UT-A

검색결과 391건 처리시간 0.022초

Alginate와 Agar-Agar에 의한 연합인상법의 촌법정도에 관한 임상적 연구 (A Clinical Study on the Dimensional Accuracy of the Combined Impression (Alginate & Agar-Agar))

  • 하주태;이정만;최부병
    • 대한치과의사협회지
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    • 제17권9호통권124호
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    • pp.701-708
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    • 1979
  • A series of combined impressions, alginate impressions and rubber base impression made of the lower left quadrant of one subject having a cast gold crown with six reference marks on lower let 1st molar. the combined impressions of hydrocolloid were removed from the mouth at 2.5min, after the insertion of the tray. The alginate impressions were removed from the mouth at 2min, after the insertion of the tray. The rubber base impressions were removed from the mouth at 10min. The effect on the accuracy of the combined impressions, alginate impressions and rubber base impressions was obtained following results by comparing the distances between the reference marks in indirect stone cast with the standard measurements of the cast gold crown prior to cementation. The findings through this study could be summarized as follows; 1. The accuracy of combined impression was superior to that of alginate impression, but it was inferior to that of rubber base impressions. 2. Combined impressions produced a little distortion of the mesio-distal length, alginate impressions produced the largest distortion, ut rubber base impressions produced the least distortion.

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Application of Geometry-Efficiency Variation Technique to Activity Measurement of $^{204}T1$ for 3-PM Liquid Scintillation Counting

  • Lee Hwa Yong;Seo Ji Suk;Kwak Ji Yeon;Hwang Han-Yull;Lee K. B.;Lee Jong Man;Park Tae Soon
    • Nuclear Engineering and Technology
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    • 제36권2호
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    • pp.121-126
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    • 2004
  • 3-PM liquid scintillation counting using the geometry-efficiency variation technique has been applied to the activity measurement of $^{204}T1$, which decays to $^{204}Hg\;and\;^{204}Pb\;by\;{\beta}^-$ and E.C., respectively. The TDCR values K have been derived over a wide range, 0.78 < K < 0.97, by displacing the detectors up to 50 mm away from an unquenched liquid scintillation sample $^{204}Tl$. The derived plots of the logic sums of double coincidences $N_D(K)$ very K vary linearly in the observed regions. The fractions of losses due to electron capture decay have been taken into account by employing a PENELOPE Monte Carlo simulation. The calibrated activity is 102.3 kBq at a reference date of July 1st, 2002 (UT) with a combined uncertainty of $0.63\%$. This is consistent with the value determined by means of the CIEMAT/NIST method at KRISS.

Correlation between Forward Head Posture, Round Shoulder Posture, and Muscle Activity during the Shoulder Flexion and Abduction Task

  • Hae-Yong Lee;Min-Sik Yong
    • The Journal of Korean Physical Therapy
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    • 제35권3호
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    • pp.83-88
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    • 2023
  • Purpose: This study was to investigate the effect of forward head posture (FHP) and round shoulder posture (RSP) on changes in muscle activities according to shoulder flexion and abduction tasks. Methods: Twenty-two male subjects with no history of neurological, musculoskeletal surgery or injuries, or pain in the spine region within the previous 3-month periods were recruited for this study. Craniovertebral angle (CVA) and Scapula Index were measured before performing 90° abduction and flexion tasks holding a 3kg dumbbell. Muscle activities were measured during the tasks. All measurements except height of the acromion were carried out in a sitting position at the height of the subject's knee angle of 90 degrees, and two tasks were randomly performed with the arm that the subject mainly use to throw the ball. The abduction and flexion angles were checked by the examiner using a goniometer beside the subject. Results: Correlation coefficient analysis between Scapular Index and upper trapezius muscle activity during shoulder abduction task showed significant positive correlation. No significant correlation was observed between CVA, Scapular Index, and other muscle activities. Conclusion: FHP showed increased muscle activation, making it difficult to change muscle activity under lower loads, and RSP was correlated with UT activation in shoulder abduction. Therefore, in the RSP, the loaded shoulder abduction is considered a potential risk factor for increasing shoulder muscle tension. This paper proposes an approach to treating RSP before FHP.

핵발전소 증기발생기의 초음파 비파괴 평가를 위한 영상처리 소프트웨어 개발 (Development of Image Processing Software for UT-NDE of Steam Generator of Nuclear Power Plant)

  • 이영석;남명우
    • 한국산학기술학회논문지
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    • 제8권2호
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    • pp.226-231
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    • 2007
  • 본 논문은 핵발전소의 초음파 비파괴 평가를 수행하기 위하여 구현된 초음파 신호 분석 소프트웨어에 관한 것이다. 구현된 소프트웨어는 1차원 초음파 신호뿐만 아니라 이를 가공하여 B, C 및 D 스캔 영상으로의 확장이 가능하고 각 스캔 영상으로부터 의미 있는 파라메터를 측정할 수 있는 기능을 갖추고 있다. 구현된 소프트웨어는 이미 알고 있는 시편의 결함에 적용하여 프로그램의 정확성을 검증하였다.

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심지층 고준위 방사성 폐기물 처분장의 개념설계를 위한 구조적 안정성 해석 (Structural Analysis for the Conceptual Design of a High Level Radioactive Waste Repository in a Deep Deposit)

  • 권상기;장근무;강철형
    • 터널과지하공간
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    • 제9권2호
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    • pp.102-113
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    • 1999
  • 결정질 암반에 설치되는 처분공과 처분터널의 구조적 안정성을 평가하기 위해 UDEC과 3DEC을 이용하여 2차원해석과 3차원 해석의 결과를 비교 분석함으로써 불연속면의 존재, 처분공 사이의 간격 등이 처분터널과 처분공의 안정성에 미치는 영향을 파악하고자 하였다. 2차원 및 3차원 불연속 해석모델에서 최대주응력 및 파괴발생 가능성이 큰 지점은 터널과 불연속면 사이의 암반이다. 또한 처분공을 포함하는 해석단면에 대한 2차원 및 3차원 해석결과, 합리적인 결과를 얻기 위해서는 3차원 해석이 필요함을 제시할 수 있었다. 그리고 처분공 간격이 8m에서 3m로 감소하더라도 처분터널의 역학적인 안정성에는 큰 변화가 발생하지 않는 것으로 나타났다

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A New Physical Layer Transmission Scheme for LPI and High Throughput in the Cooperative SC-FDMA System

  • Li, Yingshan;Wu, Chao;Sun, Dongyan;Xia, Junli;Ryu, Heung-Gyoon
    • Journal of Communications and Networks
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    • 제15권5호
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    • pp.457-463
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    • 2013
  • In recent days, cooperative diversity and communication security become important research issues for wireless communications. In this paper, to achieve low probability of interception (LPI) and high throughput in the cooperative single-carrier frequency division multiple access (SC-FDMA) system, a new physical layer transmission scheme is proposed, where a new encryption algorithm is applied and adaptive modulation is further considered based on channel state information (CSI). By doing so, neither relay node nor eavesdropper can intercept the information signals transmitted from user terminal (UT). Simulation results show above new physical layer transmission scheme brings in high transmission safety and secrecy rate. Furthermore, by applying adaptive modulation and coding (AMC) technique according to CSI, transmission throughput can be increased significantly. Additionally, low peak-to-average power ratio (PAPR) characteristic can still be remained due to the uniform distribution of random coefficients used for encryption algorithm.

웨이블렛 필터를 이용한 자동차 실내공간의 잔향시간 측정에 관한 연구 (Measurement of Reverberation Times in the Compartment of Vehicles Using Wavelet Filter Bank)

  • 이상권;유동준;이승영;박동철
    • 한국소음진동공학회논문집
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    • 제14권2호
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    • pp.111-118
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    • 2004
  • A number of researchers have attempted to measure the reverberation time of a passenger car, ut the reverberation time of passenger car is too short to measure with the traditional band pass filter. And if the reverberation time is very short, the product of the reverberation time (T) and the bandwidth (B) of the traditional band pass fitter becomes small. The low limit of BT product required for the measurement of reverberation time with the traditional band pass filter is 16. In order to overcome this problem, the wavelet filter bank was developed. In this study, this new wavelet filter was employed to measure the reverberation times of five different classes of passenger cars. The low limit of BT product required for the measurement of reverberation time with the wavelet filter is 4. The reverberation times of five passenger cars were measured successfully with the new wavelet filter bank. The reverberation times measured in most passenger cars was found to be around 0.04. Compared with general acoustic rooms like concert halls, this is a very short reverberation time

이천 태양전파 분광시스템 및 운용 소프트웨어 개발 (ICHON SOLAR RADIO SPECTROGRAPHIC SYSTEM AND DEVELOPMENT OF ITS OPERATION SOFTWARE)

  • 조경석;이근호;김갑성
    • Journal of Astronomy and Space Sciences
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    • 제14권2호
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    • pp.320-329
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    • 1997
  • 전파연구소 이천 분소에는 각각 세 개의 안테나로 30MHz∼2500MHz 대역의 태양전파를 관측할 수 있는 광대 역 태양전파분광시스템이 1995년에 설치되었다. 그 동안 태양전파 데이터를 수집 분석할 수 있는 소프트웨어가 없어 실질적인 관측이 이루어지지 않았으나 본 연구에 의해 운용 소프트웨어가 개발됨으로써 본격적인 태양전파관측 연구를 수행할 수 있게 되었다. 개발된 운용 소프트웨어를 실험 이용한 결과 1997년 11월 4일 06시경(UT)에 연속하여 발생한 3개의 TYPE III Burst에 대한 양질의 관측자료를 얻을 수 있었다. 본 논문에서는 전파연구소 이천 분소의 광대역 전파분광시스템을 소개하고 태양전파 데이터의 취득, 처리 및 분석을 위해 개발한 소프트웨어와 이를 통해 관측된 결과에 대하여 설명한다.

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벼 도열병에 대한 품종의 지속저항성 발현요인에 관한 연구 3. 품종과 도열병균 레이스의 상호관계 (Factors Affecting the Expression of Durable Resistance of Rice Cultivars to Blast Caused by Pyricularia grisea Sacc)

  • 라동수;오정행;한성숙
    • 한국식물병리학회지
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    • 제13권2호
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    • pp.90-94
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    • 1997
  • Interaction of races of rice blast fungus and cultivars has been evaluated. Dongjinbyeo was infected by four KJ races and two KI races, while other varieties were susceptible to four to six KJ or KI races. Among the single spores reisolated from the leaf blast lesion of Dongjinbyeo after mixed inoculation of 10 races, 63% was race KJ-301 which produced a small number and small size lesions, while 30% was race KI-313 which produced a large number of lesions. However, 93% of single spores reisolated from Palgongbyeo was a highly virulent race KJ-105. On the other hand, all the races were equally reisolated from the susceptible cultivar Jinmibyeo. Frequency of races isolated from the naturally infected leaf blast lesions in the field was similar to that of reisolated races from the cultivars inoculated with 10 mixed races in the greenhouse. However, 30% of single spores isolated from the naturally infected Dongjinbyeo was race KI-329 ut ace KI-313 was not detected. Genetic relationship of the isolates collected from leaf and neck blast fungus of Jinmibyeo and Nakdongbyeo showed specific bands on RFLP-P64, However, their genetic similarity was 80%.

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Exploration of genetic diversity of Bacillus spp. from industrial shrimp ponds in Vietnam by multi-locus sequence typing

  • Le, Xuan The;Pham, Dung Tien;Pham, Tuan Anh;Tran, Tung Thanh;Khuat, Thanh Huu;Le, Hoa Quang;Vu, Ut Ngoc
    • Fisheries and Aquatic Sciences
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    • 제22권8호
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    • pp.17.1-17.9
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    • 2019
  • Bacillus is a diverse genus consisting of more than 200 species with extensive genetic diversity. Their beneficial effects in industrial shrimp farming have been well documented. However, little is known about the biodiversity of the Bacillus spp. in this aquaculture system. Taxonomic analysis by 16S rRNA sequencing does not always allow species-level identification of Bacillus spp. In this study, 26 Bacillus isolates from two industrial Litopenaeus vannamei shrimp ponds in Bac Lieu Province, Vietnam, were analyzed for their genetic diversity by multi-locus sequence typing (MLST). A total of 22 sequence types were identified and segregated into four distinct clusters, corresponding to B. subtilis, B. velezensis, B. siamensis, and B. licheniformis. Bacillus subtilis and B. velezensis accounted for more than 73% of the Bacillus isolates. Notably, the MLST scheme exhibited high discriminatory power and might be further simplified to be a convenient method to identify species of the genus Bacillus.