• 제목/요약/키워드: minimum cut

검색결과 206건 처리시간 0.023초

신경망을 이용한 유연성 디스크 연삭가공공정 인자 예측에 관한 연구 (A Study on the Flexible Disk Grinding Process Parameter Prediction Using Neural Network)

  • 유송민
    • 한국공작기계학회논문집
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    • 제17권5호
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    • pp.123-130
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    • 2008
  • In order to clarify detailed mechanism of the flexible disk grinding system, workpiece length was introduced and its performance was evaluated. Flat zone ratio increased as the workpiece length increased. Increasing wheel speed and depth of cut also enhanced process performance by producing larger flat zone ratio. Neural network system was successfully applied to predict minimum depth of engagement and flat zone ratio. An additional input parameter as workpiece length to the neural network system enhanced the prediction performance by reducing error rate. By rearranging the Input combinations to the network, the workpiece length was precisely predicted with the prediction error rate lower than 2.8% depending on the network structure.

A Clinical History Recording Management Scheme on the Multimedia Telemedicine

  • Kim Seok-Soo
    • Journal of information and communication convergence engineering
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    • 제2권3호
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    • pp.157-160
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    • 2004
  • The paper's suggestion is about hereditary facts between family members. Diagnosing patients from the point of patients temporary conditions, and so performing primitive examinations and treatments, can lead not only to frequent wrong diagnoses, and to huge medical expenses and times to the patients, but even to critical situation of patients or taking lives away. As a means to cut these cases down to a minimum, sharing medical treatment information between family members is suggested. This approach makes possible understanding physical constitution and environment between family members, and can result in bringing a faster treatment effect if some family member suffers from a similar disease. This approach, since a participation in a family membership effectuates all of family members, can minimize the membership fees, thus enabling inter-family health care on a home doctor basis.

Autofluorescence of artificial incipient root carious lesions

  • Lee, Hyeong-Mo;Park, Jeong-Kil;Hur, Bock
    • 대한치과보존학회:학술대회논문집
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    • 대한치과보존학회 2003년도 제120회 추계학술대회 제 5차 한ㆍ일 치과보존학회 공동학술대회
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    • pp.615-615
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    • 2003
  • I. Objectives This study was performed to get some information about micromorphology of subsurface lesion of root caries by observing autofluorescence using confocal laser scanning microscope(CLSM) with minimum sample preparation. II. Materials and Methods Half-cut and 1 mm thick sample of human teeth were prepared to produce artificial root carious lesions. Incipient subsurface lesions were produced under optimal pH and saturity. The lesions were observed by polarized microscopy, CLSM, and back-scattered electron microscope(BSE). Calcium and phosphorus concentrations of the lesions were analyzed by line EDAX. (omitted)

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수종의 버드나무과 유관속 형성층의 구조에 관한 비교연구 (Comparative Study on the Structure of Vascular Cambium in Some Salicaceae)

    • 한국자원식물학회지
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    • 제11권3호
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    • pp.326-334
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    • 1998
  • Vascular cambium in 16 species of Salicaceae is nonstoried in all of them and is made up of fusiform and ray initials. The growth of cambial girth occurred by pseudotransverse division of fusiform initials and subsequent apical intrusive growth of daughter initials. The measurements of fusiform initials in tangerntial sections have revealed that the average length varies from 252.2-437.1${\mu}{\textrm}{m}$ in investigated species, with the maximum being in Populus euramericana and the minimum in Salix purprea var. Multinervis. The length of fusiform initials depends on the length of the tapering end wall , therefore, the longer the length of the tapering end wall, therefore, the longer the length of the taperding end wall, the longer the length of fusiform initials. Ray initials have their own size, magnitude, and frequency of occrrence in each species. The relative proportion of ray initials fall about 15.0-24.5% in Salicaceae. Shrubby species of Salix have a lower ratio of ray initials than the species which possess wider trunks. New ray initials are originated from cut off the side or the end of fusiform initials and central partition of a fusiform initials.

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지리정보시스템(GIS)을 이용한 벌채가능지역의 구분 및 입목가격 산정에 관한 연구 (A Study on Dividing the Feasible Areas to Cut and Calculating the Stumpage Value of Forests using Geographic Information System)

  • 김한수;원현규;최조룡;우종춘
    • 한국지리정보학회지
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    • 제3권3호
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    • pp.54-68
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    • 2000
  • 본 연구는 입목가격의 산정을 위해 지리정보시스템을 적용해 보고자 시도되었다. 우선 지리정보시스템(GIS)에 의해 연구대상지역의 산림에 대한 벌채가능지역을 구분하였고 이 지역산림의 입목가격을 산출하였다. 단위재적당 입목가격은 국유림산물 매각규칙 및 시행내규의 가격산출 공정에 따라 시장가역산법에 의해 산출되었다. 이때 GIS를 이용하여 벌목조재공정과 산지집재공정에 대한 작업량을 산출하여 시장가역산법에 의한 $m^3$당 입목가격을 산출하였다. 그 결과 침엽수의 가격은 $m^3$당 최하 1만원 이하에서부터 최고 5만원 정도까지 입목가격 분포를 나타냈으며 활엽수의 경우는 최하 2만원에서부터 최고 4만원이상으로 나타났다. 본 연구대상지역(250ha)중에서 벌채제한지역을 제외한 벌채가능지역(197.3ha)의 총 판매예상가격은 11억 3,126만원으로서 잣나무가 6억 5,010만원(57%) 낙엽송이 9,695만원(9%)을 차지하였고 활엽수의 가격은 3억 8,299만원으로 전체의 약 34%를 차지하였다. 그리고 소나무는 122만원으로서 그 차지하는 비율이 매우 경미하였다.

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Korean Customer Attitudes Towards SNS Shopping

  • Cho, Young-Sang;Heo, Jeong-Yoon;Youn, Myoung-Kil
    • 유통과학연구
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    • 제10권8호
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    • pp.7-14
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    • 2012
  • As a new format of retailing, social shopping on SNS has rapidly grown in recent. Although there is much literature associated with customer behaviours in the academic world, little attention has been paid to identifying the shopping patterns of SNS shoppers. This paper will, thus, identify how perceived value has an impact on the buying intention of SNS shoppers, after illustrating what kind of factor influences the formation process of perceived value in the Korean marketplace. Given that SNS shoppers are for the most part 20s as well as 30s, the authors handed out questionnaires to them. Furthermore, based on literature review results, the conceptualised research model was developed. Despite lack of literature, the authors developed five constructs like price reduction, quantity- and time-limited message, product ranges, information-sharing, and required number of shoppers. The researchers made a considerable effort to identify the relationship between research concepts and each variable, based on a few research analysis methods such as frequency analysis, the Varimax rotation technique used orthogonal rotation, Cronbach's Alpha, PCA (Principle Component Analysis), and the like. Amongst the 5 variables used to measure the degree of influences on the perceived value as a social shopping characteristic, it has been evident that price cut, required minimum shoppers, product variety, and information-sharing have a positive impact on the perceived value formation processes of SNS customers. Also, this research implies that SNS retailers can differentiate themselves from other retailers by differently using the above factors. From a practitioner's point of view, these factors should be strategically used to increase the social shopping opportunities of SNS users. It is, furthermore, evident that the perceived value formed by the above 4 factors have played an important role in the buying decision process of SNS customers. In a sense, whether customers are aware of higher price cut rates, information-sharing, required minimum shoppers, and product variety has a positive impact on making buying decisions. From a retailer's point of view, online shopping mall operators are able to use blog as well as twitter to improve the buying intention as a marketing tool of social network, because the business activities provided by social shopping retailers, like the rapid, accurate responses to customer requirements, the provision of a variety of information, and the communications between customers are closely related to buying intentions. There are a few research limitations to conduct this empirical research. It was not easy to review prior papers, due to its lack. In spite of the increasing number of SNS shoppers in Korea, little research attention has been paid to this kind of research topic by academicians, because buying products or services through SNS is in its infancy. With regard to research populations, it would be difficult to generalise the research findings in Korea, owing to unbalanced respondent distribution. Considering the above research limitations as well as the growth of social shopping, many authors should pay considerable attention to SNS-related issues in the future, and develop the more sophisticated criteria to measure the characteristics of SNS shoppers.

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A Correlation Study of Clinical Outcomes by Quantification of Fatty Degeneration of the Subscapularis: Partial vs. Whole Cross-section

  • Park, Joo Hyun;Lee, Kwang Yeol;Rhee, Sung Min;Oh, Joo Han
    • Clinics in Shoulder and Elbow
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    • 제21권2호
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    • pp.67-74
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    • 2018
  • Background: Fatty degeneration of rotator cuff is a well-known predictor of postoperative outcome. The purpose of this study was to evaluate the clinical features of rotator cuff tears involving subscapularis, and investigate whether fatty degeneration quantified from only the upper subscapularis correlates better with clinical outcomes than quantified from the whole subscapularis. Methods: We retrospectively analyzed 315 consecutive patients who underwent arthroscopic repair for rotator cuff tears involving subscapularis with a minimum follow-up of 1 year. Preoperative and postoperative visual analogue score for pain, range of motion and functional scores were assessed. Integrity of the repaired tendon was assessed at the 1-year follow-up with either magnetic resonance imaging or ultrasonography. Results: The mean Goutallier grade of whole cross-section was significantly lower than that of upper cross-section (1.59 vs. 1.71, p<0.05), but significantly higher than that of lower cross-section (1.59 vs. 1.01, p<0.05). In analysis of 37 re-tears, the occupancy of severe fatty degeneration in upper cross-section was 86.5%, which was significantly higher than that seen in whole cross-section (56.8%, p<0.05). We calculated the cut-off tear size for prediction of re-tears as 19.0 mm for retraction and 11.0 mm for superior-inferior. The cut-off Goutallier grade was 2.5 for both whole and upper cross-sections, but area under the curve was greater in the upper cross-section than the whole (0.911 vs. 0.807). Conclusions: As fatty degeneration of upper subscapularis demonstrated a more distinct spectrum than whole subscapularis, we suggest that measuring fatty degeneration of upper subscapularis can be a more useful method to predict clinical prognosis.

Minimal Clinically Important Difference of Berg Balance Scale scores in people with acute stroke

  • Song, Min-Jeong;Lee, Jae-Hyoung;Shin, Won-Seob
    • Physical Therapy Rehabilitation Science
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    • 제7권3호
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    • pp.102-108
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    • 2018
  • Objective: To investigate whether the Minimal Clinically Important Difference (MCID) clinically defines improvement of Berg Balance Scale (BBS) scores in people with acute stroke in response to rehabilitation. Design: Retrospective study. Methods: Seventy-three participants with acute stroke participated in the study. Balance evaluation was performed using the BBS. All patients received rehabilitation with physical therapy for 4 weeks, 5 times a week, for 2 hours and 20 minutes a day. An anchor-based approach using the clinical global impression was used to determine the MCID of the BBS. The MCID was used to define the minimum change in the BBS total score (postintervention-preintervention) that was needed to perceive at least a 3-point improvement on the global rating of change. Receiver operating characteristic (ROC) curves was used to define the cut-off values of the optimal MCID of the BBS in order to discriminate between improvement and no improvement groups. Results: The optimal MCID cut-off point for the BBS change scores was 12.5 points for males with a sensitivity (Sn) of 0.62 and a specificity (Sp) of 0.89, and 12.5 points for females with a Sn of 0.69 and Sp of 0.85. The area under the curve of the ROC curve for all participants were 0.84 (95% confidence interval [CI], 0.72; 0.95, p<0.001), and 0.89 (95% CI, 0.77; 1.00, p<0.001), respectively. Conclusions: The MCID for improvement in balance as measured by the BBS was 13.5 points, indicating that the MCID does clinically detect changes in balance abilities in persons with stroke.

암반사면의 평면파괴에 대한 신뢰성해석 (Reliability Analysis of Plane Failure in Rock Slope)

  • 장연수;오승현;김종수
    • 한국지반공학회논문집
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    • 제18권4호
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    • pp.119-126
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    • 2002
  • 본 논문에서는 암반사면의 절토시 현장지반 시추조사의 불충분한 자료와 비균질한 지반특성에서 오는 불확실성이 암사면의 파괴확률에 미치는 영향을 알아보기 위하여 신뢰성해석을 실시하였고 이를 확정론적 해석결과와 비교하였다. 해석에 사용된 확률변수는 절리면의 점착력과 마찰각, 암반의 단위중량 이었으며 절리면의 경사각은 확률변수로 적용한 경우와 그렇지 않은 경우로 나누어 해석하였다. 해석 결과 대상 절토사면의 경우 확정론적 해석시 안정하게 나타남에도 신뢰도 해석에서는 연약 지질층의 영향에 의한 높은 불명확성으로 인하여 높은 파괴확률을 갖는 것으로 나타났다. 각 확률변수의 평균값과 분산에 대한 파괴확률의 민감도는 점착력이 가장 큰 것으로 나타났으며 평균값이 미치는 민감도가 분산의 경우보다 크게 나타나 현장 지반물성치들에 대한 평균값의 정확한 산출이 중요한 것으로 나타났다.

FTA를 이용한 화학공장의 위험성 평가 및 응용 (Risk Assessment and Application in Chemical Plants Using Fault Tree Analysis)

  • 김윤화;김기수;윤성렬;엄성인;고재욱
    • 한국가스학회지
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    • 제1권1호
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    • pp.81-86
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    • 1997
  • 본 연구에서는 다양한 위험성 평가 방법중에서 사고의 발생 경위를 연역적으로 추론해 나가는 이상 트리 분석 방법을 이용하여 정상사상을 일으킬 수 있는 시스템 요소들의 파악으로부터 화학공장의 사고 발생 가능성을 산정하였다. Gate-by-gate 방법과 최소 컷 ? 방법을 이용하여 공장내 존재하는 잠재위험에 대하여 정성적 및 정량적 위험성 평가를 수행하였다. 정량적인 위험성 평가 단계에서는 시스템 요소의 고장률 또는 신뢰율 자료로부터 정상사상의 사고 발생 확률 및 빈도를 계산하였다 결론적으로 이상 트리 분석방법을 이용하여 시스템/공정의 사고 발생확률을 논리 방식으로 계산할 수 있었으며, 중요도 분석을 이용하여 정상 사상이 발생하는데 가장 큰 영향을 미치는 손실 경로를 확인하여 보았다.

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