• Physical Therapy Rehabilitation Science
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• 제9권2호
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• pp.105-112
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• 2020

Objective: To investigate the effects of training using a trunk control robot (TCR) system combined with conventional therapy (CT) on balance and gait abilities in persons with chronic stroke. Design: Two-group pretest-posttest design. Methods: Thirty-five subjects with chronic stroke were randomly assigned to either the TCR group (n=17) or the trunk extension-training (TET) group (n=18). Both groups performed CT for 30 minutes, after which the TCR group performed TCR training and the TET group performed trunk extension training for 20 minutes. Both groups performed the therapeutic interventions 3 days per week for 6 weeks. Balance ability was evaluated using the Berg Balance Scale (BBS), and the Timed Up-and-Go (TUG) test. Gait ability was measured using the 10 m Walk Test (10MWT) and the NeuroCom Smart Balance Master. Results: TCR group showed significant improvements in static balance (weight bearing) and dynamic balance (weight shifting speed, weight shifting direction, BBS, and TUG), 10MWT, gait speed, and step width (p<0.05); step length was not significant. The TET group showed a significant partial improvement of dynamic balance (weight shifting speed, weight shifting direction, BBS, and 10MWT (p<0.05), but the improvements in static balance, TUG, gait speed, and step width and step length was not significant. Additionally, significant differences in static balance, dynamic balance (weight shifting speed, weight shifting direction, BBS, and TUG), 10MWT, gait speed, and step width were detected between groups (p<0.05). Conclusions: TCR training combined with CT is effective in improving static and dynamic balance, as well as gait abilities in persons with chronic stroke.

• 한국산학기술학회논문지
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• 제7권3호
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• pp.385-392
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• 2006

본 논문은 오프라인 필기체 한글 인식을 위한 요소 기술의 하나인 자소 분할을 위한 새로운 자획 추출법을 제안한다. 수평 런 길이를 이용하여 자소의 자획을 수직, 경사, 수평으로 구분 분리한다. 수직 자획이나 경사 자획의 수평 런 길이는 자획 두에가 되며, 수평 자획의 수평 런의 개수가 자획 두께가 된다. 수평 자획을 분리 추출한 후, 끊어진 수직, 경사 자획을 자획 두께의 수평 런으로 연결하여 분리한 자획들이 문자의 특징을 나타내게 한다. 추출된 자획들은 온라인 필기체 한글 인식 시스템에서 개발 사용되고 있는 자획 사전 정합을 통해 문자 인식을 할 수 있다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1999년도 제3회 압연심포지엄 논문집 압연기술의 미래개척 (Exploitation of Future Rolling Technologies)
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• pp.429-437
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• 1999

Width variation of the top and bottom ends of steel at finishing rolling in a plate, has been investigated. It was found that width variation after finishing rolling is affected by edging, broadside rolling ratio, longitudinal rolling ratio, width shape after broadside rolling, temperature, width-to-thickness ratio, and so on. A neural network modelling of back propagation has been conducted on the width variation during rolling. Based on these prediction models, a width control system, by which the roll opening and closing of the hydraulic AWC edger can be adjusted during edge rolling in finishing rolling passes, has been developed. Compared to conventional width model, the neural network model is much accurate in a model. The width control system is applied to a newly built production mill.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.373-375
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• 2005

The purpose of this paper is to develop the Plastic Cortex Stimulator(PCS) for stroke patients using ZigBee technology. The PCS consists of an implantable neuro-stimulator and a user controller, The neuro-stimulator has the stimulus circuit which is the H-bridge circuit to generate a bipolar pulse. The bipolar pulse is known to be effective for stroke recovery. The user controller sends several wave-shape parameters (amplitude, pulse width, cycle, etc.) to the neuro-stimulator for variable stimulation using ZigBee technology. The CC2420 and atmega128L was used to implement ZigBee protocol stack. The wireless control of PCS based on ZigBee can help the tele-rehabilitation of the stroke patients. The most effective pulse shape parameters are being investigated through animal experiments. The bio-compatibility and user-friendly interface are supposed to be handled in further study.

• 대한인간공학회지
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• 제14권2호
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• pp.15-24
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• 1995

The purpose of this study is to provide ergonomic research data for the redesign of the car license plate in Korea. Several alternatives having various combinations of fonts, stroke-width ratios, color contrasts, and arrays were considered in order to find the best one in terms of the reading-distance and the misreading-rate. Experiments investigating the reading-distance, misreading-rates were conducted. In addition, the alternatives were tested in a real driving situation. The results can be summarized as follows : The typography having mixed type numeric forms with quasi-Gothic and NAMEL, stroke-width ratio of 1:7 .approx. 1: 8, the black on yellow contrast showed a good reading-distance. The array with Hangul(showing territorial office and use-sign) at the upper row and 6 mumbers ( showing car class-sign and serial number) at the lower row showed relatively low misreading-rate.

• 대한인간공학회지
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• 제7권1호
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• pp.13-20
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• 1988

The purpose of this study is to provide basic research data on the readability of the car number license plate in Korea by experimental procedure. This study is performed by the combination of color contrasts, character forms, and stroke widths. Additionally it is focused on the distance of distinct vision and misreading rate. The results of the this study are as follows: First, as to the color contrasts, the plate which has black on yellow contrast has better readability than current contrast between white and green (white character on green plate, vice versa). Second, as the character forms, it is showed that Quasigothic and NAMEL types have less misreading rates by 42.86% and 42.15%, respectively, than current Gothic type, and they also increase distance of distant vision by 4 meter. Third, as to the stroke widths, it is showed that 12 milli-meter and 14 milli-meter of stroke widths have less misreading rates by 63.94% and 65.33 %, respectively, than current 6 milli-meter of stroke width.

• 대한기계학회논문집A
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• 제23권7호
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• pp.1196-1204
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• 1999

adaption of the model predictions is highly desirable. In general, the width deviation at the head and tail ends of strip may be different from that of the steady state region. Therefore, the dynamic edger corrections can be used to compensate the width deviations which would otherwise occur. For the precise width control, the effect of edger roll gap and rolling conditions on the width deviation of head and tail ends of strip has been investigated and the effective method to decrease width deviation has been proposed. On-line application of dynamic edger control method in this study shows about 50% width compensation at the head end of the strip, and near perfect compensation at the tail end of strip.

• 대한통합의학회지
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• 제10권1호
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• pp.91-99
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• 2022

Purpose : The goal of this study is to examine the effect of robot assisted gait training (RAGT) on the kinematic factors (temporospatial gait parameters, gait cycle ratio, and gait line length) of gait in stroke patients. Methods : The subjects of this study were 24 stroke patients selected by inclusion criteria. Participants were randomly allocated to two groups: robot assisted gait training (n=11) and general neurological physical therapy group (n=11). In the robot-assisted gait training group, robot-assisted gait training was mediated for 30 minutes a day in addition to general neurological physical therapy. The general neurological physical therapy group was mediated by general neurological physical therapy for 30 minutes a day in addition to general neurological physical therapy. The number of interventions was 5 times a week for 5 weeks. In order to compare the kinematic factors of walking between the two groups, gait analysis was performed before and after 5 weeks of training using the Zebris gait analysis system. Results : As a result of the gait analysis of the two groups, there were significant differences in temporospatial gait variables (step length, stride length, step width, step time, stride time), gait cycle ratio (swing phase, stance phase) and gait line length. However, there was no significant difference in the cadence (temporospatial gait parameters) in the robot assisted gait training group compared to general neurological physical therapy group. Conclusion : It is considered to be a useful treatment for stroke patients to promote the recovery of gait function in stroke patients. Based on the results of this study, continuous robot assisted gait training treatment is considered to have a positive effect on gait ability, the goal of stroke rehabilitation. In the future, additional studies should be conducted on many subjects of stroke patients, the kinematic factors of the legs according to the severity of stroke and treatment period, and the effect of gait training.

• 한국멀티미디어학회논문지
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• 제9권8호
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• pp.1045-1053
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• 2006

본 연구에서는 MHN(Maximum Homogeneity Neighbor) 필터링을 이용한 회화적 렌더링의 브러시 스트로크생성 알고리즘을 제안한다. 기존의 입력 영상의 기울기(gradient)를 브러시 스트로크의 생성에 이용하는 연구와 달리 영상을 구성하는 픽셀의 동질성(homogeneity)에 기반을 두어 스트로크를 생성하였다. 이를 위해 입력 영상에 MHN 필터를 적용하여 하나의 브러시 스트로크로 그려질 수 있는 동질성 영역을 추출하고 추출된 영역으로부터 최소자승법으로 브러시 스트로크의 중심축을 계산한 후, 팽창함수를 정의하여 브러시 스트로크를 생성하였다. 이 방법은 기존의 경사도 기반 스트로크 생성 방법을 복잡한 입력영상에 적용했을 때 발생하는 문제점인 스트로크 방향의 비일관성을 해결할 수 있다. 또한 두께가 일정하지 않은 브러시 스트로크를 표현할 수 있어 결과 영상의 회화적 느낌을 높일 수 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 심포지엄 논문집 정보 및 제어부문
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• pp.33-35
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• 2006

We studied the prototypal developments of Plastic Cortex Stimulator (PCS) for stroke patients. The PC sends the stimulation parameters (amplitude, pulse width, cycle, etc.) to the transmitter ZigBee module through serial port. The receiver ZigBee module generates stimulation waveform. The generated output can be controlled by the PC program. Further study can be expanded to portable handset such as PDA using ZigBee. The wireless control of PCS with the handset can help the tele-rehabilitation.