• 제목/요약/키워드: broken

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The surgical retrieval of a broken dental needle: A case report

  • Lee, Jiseon;Park, Min Woo;Kim, Min Keun;Kim, Soung Min;Seo, Kwang-Suk
    • Journal of Dental Anesthesia and Pain Medicine
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    • 제15권2호
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    • pp.97-100
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    • 2015
  • One complication related to local anesthesia in the dental clinic is a broken needle. Although rare, a broken needle may be difficult to retrieve. Dental radiographs and 3D CT have been used in the past to confirm the location of a broken needle. We present the case of a broken needle, which was successfully removed using a careful, microscopic approach.

Broken-Stick 모형에 기초한 주성분 공헌도평가 (Contribution of Principal Components Based on the Broken-Stick Model)

  • 강유정;변자현;김기영
    • 응용통계연구
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    • 제23권4호
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    • pp.767-776
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    • 2010
  • Broken-Stick 모형 (Barton과 David, 1956) 하에서 순서화된 분절구간의 기대길이를 기초로 유효차원의 개수를 결정하는 Frontier (1976)방법은 일관된 모의실험 결과를 제공하는 기준 중의 하나로 보고된 바 있다 (Jackson, 1993). 이 연구에서는 Broken-Stick 모형(BSM) 하에서 분절구간길이의 분포를 이용하여 주성분 상대공헌도의 크기를 확률적으로 평가하는 BSM 유의확률기준을 제안한다. 이에 부가하여 소득분포의 불균등성을 도식화한 로렌츠곡선과 이에 대응하는 지니계수를 통해 주성분 공헌도의 포괄적 균등성을 탐구한다.

파벽(破壁) 영지포자가 고지방식이 섭취 마우스의 지방축적 및 체중감량에 미치는 영향 (Effect of Cell-Wall Broken Spores of Ganoderma lucidum(Leyss. ex.Fr.) Karst on the Lipid Accumulation and Body Weight Reduction in C57BL/6J Mice fed High-Fat Diet)

  • 박금주;강정일;김태석;이상윤;여익현
    • 생약학회지
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    • 제45권4호
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    • pp.346-353
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    • 2014
  • This study was performed to investigate the effects of cell-wall broken spores of Ganoderma lucidum on the lipid accumulation and body weight reduction in C57BL/6J mice. Six-week-old C57BL/6J mice were randomly divided into 5 groups and assigned to one of these groups; normal chew diet(Nor) group, high-fat diet(HFD) group, HFD plus spores of Ganoderma lucidum 800 mg/kg/day (HFD + GS/B) group, HFD plus cell-wall broken spores of Ganoderma lucidum 400 mg/kg/day (HFD + BGS/A) group and finally HFD plus cell-wall broken spores of Ganoderma lucidum 800mg/kg/day (HFD + BGS/B). The experimental groups which were treated oral co-administration with cell-wall broken(or original) spores of Ganoderma lucidum and HFD significantly attenuated accumulative body weight gain, compared with HFD group. Administration of these experimental materials also resulted in significant reduction not only the serum levels of total cholesterol, homocysteine but also the lipid accumulation in liver tissue. But in the almost of results the cell-wall broken spores of Ganoderma lucidum were evaluated superior than the original one. These results indicate that cell-wall broken spores of Ganoderma lucidum may inhibit the lipid accumulation in blood as well as liver tissue. Therefore it may be a valuable candidate for the therapy preventing obese induced hyperlipidemic symptoms.

치주큐렛 파절에 대한 연구 (Study on broken periodontal curets)

  • 권오장;이재관;장범석;엄흥식
    • Journal of Periodontal and Implant Science
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    • 제38권1호
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    • pp.23-30
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    • 2008
  • Purpose: The purpose of this study was to investigate the incidence of curet fracture and its contributing factors. Material and Methods: Fifty-eight periodontal curets which were broken during periodontal treatment in Kangnung National University Dental Hospital for 1 year were used as study materials. The blade thickness of new curets and broken ones was measured using a digital micrometer. Types of treatment procedures, clinical experience of operators, point of breakage, and method of removal of broken fragments were recorded for each broken curet. Results: The incidence of curet fracture in root planing (16.4 curets per 1,000 procedures) was higher than those in flap surgery (7.5) or supragingival scaling (2.7). No curet was broken during supportive periodontal treatment. The incidence of fracture did not seem to be related with clinical experience of operators. The most frequent breakage point of the curets were upper 1/3 of blades. Fifty-six of 58 broken fragments were removed by non-surgical methods. Two broken tips which could not removed non-surgically were left in the pockets, and proved to be removed spontaneously 1 week later. Conclusion: Root planing showed higher incidence of curet fracture than any other type of periodontal treatment. Most of the fractured fragments were removed by non-surgical method. Further study is needed to develop methods of removal of the fragments which can not be removed non-surgically.

Monolith and Partition Schemes with LDA and Neural Networks as Detector Units for Induction Motor Broken Rotor Bar Fault Detection

  • Ayhan Bulent;Chow Mo-Yuen;Song Myung-Hyun
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • 제5B권2호
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    • pp.103-110
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    • 2005
  • Broken rotor bars in induction motors can be detected by monitoring any abnormality of the spectrum amplitudes at certain frequencies in the motor current spectrum. Broken rotor bar fault detection schemes should rely on multiple signatures in order to overcome or reduce the effect of any misinterpretation of the signatures that are obscured by factors such as measurement noises and different load conditions. Multiple Discriminant Analysis (MDA) and Artificial Neural Networks (ANN) provide appropriate environments to develop such fault detection schemes because of their multi-input processing capabilities. This paper describes two fault detection schemes for broken rotor bar fault detection with multiple signature processing, and demonstrates that multiple signature processing is more efficient than single signature processing.

An Experimental Study on the Mass Release for a Hot Leg Break LBLOCA in Post Blowdown

  • Hong, Soon-Joon;Park, Goon-Cherl
    • 한국원자력학회:학술대회논문집
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    • 한국원자력학회 1996년도 춘계학술발표회논문집(2)
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    • pp.405-410
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    • 1996
  • New methodology for mass and energy release assessment in LBLOCA post blowdown is needed and, first of all, the phenomenologically improved and quantitative assessments through experiment are essential. For tile experiment of a hot leg break LBLOCA in post blowdown, the test facility was set and its feature is that tile broken hot leg has two broken sections in the tore side and in the SG side respectively and a separation valve between the two in order to measure the release rate dividedly. Specially it was focused on whether the mass release through the SG side broken section happened or not. The mass release through the core side broken section is dependent on tile safety injection flow and that through the SG side broken section varies depending on several factors. The principal factor is the primary system pressure and the subfactors such as SI flow rate, SI temperature and initial primary pressure, may contribute, too.

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장간유리애자 파손시 절연파괴 특성 (The Electrical Breakdown Characteristics of Broken Toughened Glass Stem Insulator)

  • 정종욱;정진수;김영석
    • 전기학회논문지
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    • 제57권8호
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    • pp.1398-1406
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    • 2008
  • This paper describes the electrical breakdown characteristics of broken toughened glass stem insulators by comparing with those of sound ones. The broken toughened glass stem insulators were taken from the electric railway field. According to the international standards, the sound and broken toughened glass stem insulators were tested in electrical strength. In the test, the power frequency voltage and the impulse voltage with a standard waveform were applied to the insulators. The power frequency voltage tests were carried out under both dry and wet condition and the impulse voltage tests under only dry condition. The acquired results were compared one another and discussed in electrical breakdown characteristic by analyzing the flashover progress pictures. As a result, the electrical strength of the broken toughened glass insulators was acquired and the processes of the surface breakdown on the toughened glass insulators were confirmed.

공극자속 측정에 의한 유도전동기 회전자의 Broken Bar 검출기법 (Detecting Method for Broken Rotor Bar of Induction Motor by Measuring Air-gap Flux)

  • 황돈하;강동식;이진희;최경호;김동희
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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    • pp.475-480
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    • 2006
  • In this paper, a new approach for detecting broken rotor bars in a squirrel-cage induction motor is proposed. The air-gap flux variation analysis was done using search coils inserted in stator slots when broken rotor bar occurs. An accurate modeling and analysis of air-gap flux variation in the induction motor are developed using finite-element (FE) software packages, and measurement of the flux are made using search coils. The simulation was done for the induction motor with 380 [V], 5 [HP], 4 Poles, 1,742 [rpm] ratings using the commercial FE analysis tool. The simulation and experiment results can be useful for detecting the broken rotor bar of an induction motor.

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전단응력하의 무한체내 타원체불균질물의 균열손상에 따른 하중부하능력과 탄성응력분포 (Load Carrying Capacity due to Cracking Damage of Ellipsoidal Inhomogeneity in Infinite Body under Pure Shear and Its Elastic Stress Distributions)

  • 조영태;임광희;고재용;김홍건
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2001년도 추계학술발표대회 논문집
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    • pp.87-90
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    • 2001
  • In particle or short-fiber reinforced composites, cracking of the reinforcements is a significant damage mode because the broken reinforcements lose load carrying capacity. This paper deals with elastic stress distributions and load carrying capacity of intact and cracked ellipsoidal inhomogeneities. Three dimensional finite element analysis has been carried out on intact and broken ellipsoidal inhomogeneities in an infinite body under pure shear. For the intact inhomogeneity, as well known as Eshelby(1957) solution, the stress distribution is uniform in the inhomogeneity and non-uniform in the surrounding matrix. On the other hand, for the broken inhomogeneity, the stress in the region near crack surface is considerably released and the stress distribution becomes more complex. The average stress in the inhomogeneity represents its load carrying capacity, and the difference of average stresses between the intact and broken inhomogeneities indicates the loss of load carrying capacity due to cracking damage. The load carrying capacity of the broken inhomogeneity is expressed in terms of the average stress of the intact inhomogeneity and some coefficients. It is found that the broken inhomogeneity with higher aspect ratio still maintains higher load carrying capacity.

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