• 대한물리치료과학회지
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• 제15권2호
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• pp.71-77
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• 2008

Background: The purpose of this study were to identify the physical therapist's turnover experience in Busan Metropolitan city and its related general factors, and to investigate the turnover, moving-in and out rate. Methods: First Data were collected from 102 physical therapists who working in Busan Metropolitan city using structured questionnaires and then second data collected from who call to directly. Results: Physical therapists expressed high level of turnover experience. Physical therapist's turnover experience was significantly different by their age, marital status, sex, working place and career. In proportion of the total increasing rate of physical therapist and turnover rate was increased. Conclusion: To prevent or reduce physical therapist's turnover rate, more research about causal relationships of physical therapist's turnover should studied.

• 전기학회논문지
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• 제63권7호
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• pp.962-967
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• 2014

In this paper, through a digital potentiometer and exponentially weighted moving average filter, pulse and PPG waveform measurable device was fabricated in radial artery. If this device is not proper about signal size in analog part, MCU can judge easily by adjusted amplification through digital potentiometer, using exponentially weighted moving average filter is able to filter out more clear value of ADC. I presumed pulse rate as value of measuring time between point of maximum contraction from sensing signal in radial artery of wrist. Therefore, this means can measure stable pulse rate and PPG waveform, finger as well as radial artery, whether signal size of each person is different finger as well as radial artery.

• Journal of the Korean Data and Information Science Society
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• 제24권1호
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• pp.105-115
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• 2013

인구의 감소로 대학 입학생들이 줄어듦으로써 입학생 모집을 위해서 각 대학들은 나름대로의 대책을 강구하고 있고, 교육과학기술부에서는 몇몇의 지표들을 적용하여 대학평가를 하여 대학구조 조정을 실시하고 있다. 평가지표 중에 하나인 '충원률'의 지표를 높이기 위한 방법으로 대부분의 대학에서는 학과들 간의 전과 (전출과 전입)의 폭을 넓혀 대학 내에서 학과 간에 학생들의 전과를 허용하고 있다. 이러한 전입과 전출문제는 성적이 낮은 학과로 입학하여 성적이 높은 학과로 이동하는 현상을 낳아 학과로 입학생을 모집하고 있는 현재의 학사 운영상에 잘못된 결과를 낳을 수 있다. 또한 전과율을 높이는 문제는 대학을 운영하는 입장에서는 학생들의 손실은 없지만 전출이 많은 학과의 입장은 학생의 부족현상으로 매우 어려운 처지에 놓일 수 있다. 본 연구에서는 D대학교의 사례를 중심으로 일반적인 통계분석과 사회연결망분석을 통하여 전과의 특성을 분석한다. 분석결과, 이공계열에서 인문사회계열로, 입학성적이 낮은 학과에서 높은 학과로, 취업률이 낮은 학과에서 높은 학과로 전과를 하고 있는 것으로 나타났다.

• 산업경영시스템학회지
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• 제21권45호
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• pp.365-374
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• 1998

Control Chart is a powerful tool to detect that process is in control or out of control. CIM can have real effect when CIM involve automated quality control. A neural network approach is used for unnatural pattern detecting of control chart. The previous moving window method uses all unnatural pattern that is detected as moving time window. Therefore, It trains a large number of unnatural pattern and takes training time long. In this paper, the proposed method tests a small number of training unnatural pattern which modifies test data without repeating time. We shows that the proposed method has differences In training time and identification rate on the previous moving windows method. As results, we reduced training time and obtain the same identification rate.

• 한국정밀공학회지
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• 제28권12호
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• pp.1341-1346
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• 2011

Currently, many researches are carried out for laser assisted machining, which is one of the important fields in materials difficult to process. However, a prediction of heat source is difficult because of moving heat source. In this paper, a thermal analysis of laser assisted machining of plate by change of heat source size is performed, and preheating temperature by adjusting the feed rate is controlled. It was recognized that the maximum preheating temperature increases according to the decrease in heat source size, and feed rate need to adjust as high speed. The results of this analysis can be used as a reference for preheating temperature prediction in laser assisted milling.

• 대한산업공학회지
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• 제33권4호
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• pp.457-468
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• 2007

This paper proposes an adaptive moving average (A-MA) control chart with variable sampling intervals (VSI) for detecting shifts in the process mean. The basic idea of the VSI A-MA chart is to adjust sampling intervals as well as to accumulate previous samples selectively in order to increase the sensitivity. The VSI A-MA chart employs a threshold limit to determine whether or not to increase sampling rate as well as to accumulate previous samples. If a standardized control statistic falls outside the threshold limit, the next sample is taken with higher sampling rate and is accumulated to calculate the next control statistic. If the control statistic falls within the threshold limit, the next sample is taken with lower sampling rate and only the sample is used to get the control statistic. The VSI A-MA chart produces an 'out-of-control' signal either when any control statistic falls outside the control limit or when L-consecutive control statistics fall outside the threshold limit. The control length L is introduced to prevent small mean shifts from being undetected for a long period. A Markov chain model is employed to investigate the VSI A-MA sampling process. Formulae related to the steady state average time-to signal (ATS) for an in-control state and out-of-control state are derived in closed forms. A statistical design procedure for the VSI A-MA chart is proposed. Comparative studies show that the proposed VSI A-MA chart is uniformly superior to the adaptive Cumulative sum (CUSUM) chart and to the Exponentially Weighted Moving Average (EWMA) chart, and is comparable to the variable sampling size (VSS) VSI EWMA chart with respect to the ATS performance.

• 한국도로학회논문집
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• 제15권6호
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• pp.135-141
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• 2013

PURPOSES : The lack of details of design guideline for zig-zag shaped section approaching central bus stop leads an traffic accident proneness. So, this study analysed the geometric elements of central bus stop area in terms of vehicle dynamics and suggested design alternatives. METHODS : The study analysed a dynamic behaviour of bus moving in and out of zig-zag shaped section using Auto-Turn under scenarios. Based upon dynamic analysis, the study found out the width of overtaking lane is the most influential factor for a safe moving at zig-zag alignment. RESULTS : The width of overtaking lane at design speed of 40, 50, and 60 km/h respectively was suggested given taper ratio of 1 to 10 required for Bus Rapid Transit (BRT), and the lane width is not wider than 4.0m which possibly makes two vehicles using the same lane. Also, the width of overtaking lane which mitigates the taper ratio was suggested with the same restriction about the maximum lane width. CONCLUSIONS : The results of the study can be used to prepare a design guideline on zig-zag shaped alignment of central bus exclusive lanes. The more stable moving is expected by applying the design alternatives suggested, therefore the lower rate of traffic crashes at the vicinity of central bus stops.

• 아시안잔디학회지
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• 제3권1호
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• pp.34-38
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• 1989

This research was carried out to elucidate on standing crops , dry matter yields , the nutritive value and in vitro digestihility according to mowing frequency and period during the growing season in the 3cm moving plot in Korean Lawn , Zoysia japonica Sheud . The increasing tendency in the standing crops was showed yield from May to Septemher . In the dry matter yield , there was a tendency of rapid increase from May to August ( maximum level ). Afterwards there appeared a tendency of decrease slight ( Table 3). The nutritive value and in vitro digestihility ; The crude protein and crude fat in the 3cm moving plot showed a tendency of slight decrease as a moving period and frequency . On the other hand , Neutral detergeat fiber , Acid detergent fiber and cellulose showed a tendency of slight increase as mowing period and frequency . in vitro digestibility appeared a rapid decreasing rate as a mowing period and frequency was delayed (table 2.4).

• Biotechnology and Bioprocess Engineering:BBE
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• 제9권5호
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• pp.331-338
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• 2004

The Separation of two amino acids, phenylalanine and tryptophan, was carried out using laboratory simulated moving bed (SMB) chromatography. The SMB process consisted of four zones, with each zone having 2 columns. The triangle theory was used to obtain the operating conditions for the SMB. The mass transfer coefficients of the two amino acids were obtained from the best-fit values by comparing simulated and experimental pulse data. The competitive adsorption isotherms of the two amino acids were obtained by single and binary frontal analyses, taking into consideration the competition between the two components. A competitive Langmuir isotherm, obtained from single-component frontal chromatography, was used in the first run, and the isotherm from binary frontal chromatography in the second, with the flow rate of zone 1 modified to improve the purity. Compared to the first and second runs, the competitive Langmuir isotherm from the binary frontal chromatography Showed good agreement with the experimental results. Also, adjusting the flow rate in zone 1 increased the purity of the products. The purities of the phenylalanine in the raffinate and the tryptophan in the extract were 99.84 and $99.99\%$, respectively.

• Tribology and Lubricants
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• 제18권3호
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• pp.219-227
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• 2002

A linear elastic fracture mechanics analysis of double subsurface cracks propagation in a half-space subjected to moving thermomechanical surface traction was performed using the finite element method. The effect of frictional heat at the sliding surface on the crack growth behavior is analyzed in terms of the thermal load and peclet number. The crack propagation direction is predicted in light of the magnitudes of the maximum shear and tensile stress intensity factor ranges. When moving thermomechanical surface traction exists, subsurface horizontal cracks are propagation in-plane crack growth rate at the beginning but they are propagation out-of-plane crack growth rate by the frictional heat which is occurrence by the repeated sliding contact.