• Journal of Welding and Joining
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• 제15권6호
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• pp.116-123
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• 1997

In GMA welding processes, bead contour and penetration patterns are criterion to estimate weld quality. Bead geometry is commonly defined with width, height and depth. When weaving is taken into account, selection of welding conditions is known to be difficult. Thus, empirical or trial-and-error method are usually introduced. This study examined the correlation of welding process variables including weaving parameters with bead geometry using srtificial neural networks(ANN). The main task of the Ann estimator is to realize the mapping characteristics from the sampled welding process variables to the actual bead geometry through training. After the neural network model is constructed, welding process variables for desired bead geometry is selected by inverse model. Experimental varification of the inverse model is conducted through actual welding.

• Journal of Electrical Engineering and information Science
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• 제2권6호
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• pp.146-155
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• 1997

In order to achieve scale- and rotation-invariance in recognizing unoccluded objects in binary images using Zernike moment features, an image of an object has often been normalized first by its zeroth-order moment (ZOM) or area. With elongated objects such as characters, a stroke width varies with the threshold value used, it becomes one or two pixels wider or thinner. The variations of the total area of the character becomes significant when the character is relatively thin with respect to its overall size, and the resulting normalized moment features are no longer reliable. This dilation/erosion effect is more severe when the object is not focused precisely. In this paper, we analyze the ZOM method and propose as a normalization method, the maximum enclosing circle (MEC) centered at the centroid of the character. We compare both the ZOM and MEC methods in their performance through various experiments.

• Journal of Electrical Engineering and Technology
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• 제12권3호
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• pp.1114-1123
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• 2017

A linear permanent-magnet vernier (LPMV) motor has magnets and windings in the short mover, which is very suitable for long stroke applications. This paper proposed a new field oriented control with space vector pulse width modulation for the LPMV motor, which considers loss minimization. First, the topology of the LPMV motor is briefly presented. Then, the mathematical model is derived, and the mover field oriented control strategy is proposed. Also, the loss analysis is performed. Finally, the simulated and experimental results are given, verifying the feasibility and effectiveness of the proposed control strategy.

• 한국정보처리학회논문지
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• 제6권5호
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• pp.1403-1409
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• 1999

This paper proposes an algorithm for distinguishing Korean and English characters which can be applied to multi-font by using of the ratio height to width of each character and the structural characteristics. The proposed algorithm distinguishes Korean and English characters as the aspect ratio, existing or not of stroke image on the left-upper area, and detection of a bar in an input image. The process of detecting bar is a sequence of left, upper, right, and lower. Experimental results yield 100.00% distinction rate for the Myungjo font, 99.96% for the Sinmyungjo font and the Kungseo font, and 99.77% for the Gothic font of Hanguel word processor.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2013년도 추계학술발표대회
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• pp.1318-1320
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• 2013

본 논문은, 도로표지 영상의 자동 획득, 관련 정보의 검출/인식 및 온라인 갱신 기능을 갖는 차세대 도로표지 관리시스템에 요구되는, 도로표지 영상으로부터 방향지시 정보과 국문지명을 검출하는 방법을 제안한다. 자획 폭 변환을 사용하여 비텍스트 정보를 구분하고, 한글 템플릿 매칭을 사용하여 국문 지명의 영역을 검출한다. 제안한 방법은 실제 도로표지 영상에 대해서 98%의 방향지시 정보 검출율과 92%의 국문지명 검출율 성능을 보였다.

• 조형예술학연구
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• 제6권
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• pp.100-118
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• 2004

Mi Fu, who was associated with Wen Tong, invented the Mijoem Technique (Dotting Technique) in landscape painting with his son Mi Youren. His landscapes, which referred to Dong Yuan's landscape technique and was inspired by the scenery of Jiang Nan, illustrate the mood of a cloud-covered foggy landscape by liberally applying dots with ink. 'Chunsansoesong' which is considered done by Mi Fu, clearly shows the virtues of ink painting's spreading, absorbing and omission techniques. This simply rendered landscape - whose mountains and hills are wrapped in both clouds and fog - displays exquisiteness by using small dots. In 'Chunsansoesong', the characteristics of Song painting: a 'vital energy', a 'poem within the painting', a 'beauty of margin', a 'beauty of one brush stroke, and a 'display of inner meanings' are implicatively expressed This is because it's simple but connotatively delineative. There is the characteristic of a 'poem within the painting' when analyzing the both fragmented and combined 'Chunsansoesong'. The margins support an imaginative space as the height of the mountains get higher which result in deepening both the width and depth of the landscape space. Furthermore, the soft thickness of ink, clouds, pine trees, and pavilion evoke delineative feelings and a desire to write a poem Every thing in 'Chunsansoesong' is enveloped in both clouds and fog regardless of its distance and this delivers boundless feelings of Oriental mystery and urges a desire for 'writing a poem'. The pavilion that faces the cloud and fog-bound mountains especially flames the poetic urge further by inducing viewers' poetic imaginations. As we reviewed above, 'Chunsansoesong's cloud and fog-covered landscape is a good example that clearly showcases the characteristics of a 'Poem within the Painting'.

• 말소리와 음성과학
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• 제9권3호
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• pp.85-91
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• 2017

The present study aimed to investigate the changes of acoustic parameters of the aspirated voice in stroke patients. The eighty-eight subjects diagnosed with cerebro-vascular accident were divided into 32 penetration/aspiration (P/A) and 56 Non-P/A groups according to the videofluroscopic swallowing study (VFSS) results, and 26 control subjects participated. All subjects preformed VFSS and vowel /a/ was recorded three times pre- and post VFSS. Since the variation in the acoustic parameters within a single phonation has been observed, we proposed a delta formula for the acoustic parameters which can reflect the temporal changes of the each parameter in an utterance. We measured from the voice data eight acoustic parameters: fundamental frequency (F0), standard deviation of F0 (F0_SD), Jitter, relative average perturbation (RAP), Shimmer, amplitude perturbation quotient (APQ), harmonic to noise ration (HNR), noise to harmonic ratio (NHR). Then we found parameters which show the meaningful biggest temporal change in an utterance using the suggested delta parameter. Among them, the deltas of shimmer and APQ were significantly different pre- and post VFSS. These deltas of the P/A and the control group were increased after VFSS, while those of the Non-P/A group was descended. The variation patterns of the P/A and the control group were similar but the change width of the P/A group was larger. The large variations in an aspirated phonation of the P/A group are thought to be caused by irregular changes in air resistance due to residual food on the vocal cords.

• Journal of Korean Neurosurgical Society
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• 제65권5호
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• pp.652-664
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• 2022

The Kernohan-Woltman notch phenomenon (KWNP) refers to an intracranial lesion causing massive side-to-side mass effect which leads to compression of the contralateral cerebral peduncle against the free edge of the cerebellar tentorium. Diagnosis is based on "paradoxical" motor deficit ipsilateral to the lesion associated with radiologic evidence of damage to the contralateral cerebral peduncle. To date, there is scarce evidence regarding KWNP associated neuroimaging patterns and motor function prognostic factors. A systematic review was conducted on Medline database from inception to July 2021 looking for English-language articles concerning KWNP, in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. The research yielded 45 articles for a total of 51 patients. The mean age was 40.7 years-old and the male/female sex ratio was 2/1. 63% of the patients (32/51) suffered from head trauma with a majority of acute subdural hematomas (57%, 29/51). 57% (29/51) of the patients were in the coma upon admission and 47% (24/51) presented pupil anomalies. KWNP presented the neuroimaging features of compression ischemic stroke located in the contralateral cerebral peduncle, with edema in the surrounding structures and sometimes compression stroke of the cerebral arteries passing nearby. 45% of the patients (23/51) presented a good motor functional outcome; nevertheless, no predisposing factor was identified. A Glasgow coma scale (GCS) of more than 3 showed a trend (p=0.1065) toward a better motor functional outcome. The KWNP is a regional compression syndrome oftentimes caused by sudden and massive uncal herniation and leading to contralateral cerebral peduncle ischemia. Even though patients suffering from KWNP usually present a good overall recovery, patients with a GCS of 3 may present a worse motor functional outcome. In order to better understand this syndrome, future studies will have to focus on more personalized criteria such as individual variation of tentorial notch width.

• 한국콘텐츠학회논문지
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• 제13권8호
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• pp.324-333
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• 2013

본 연구는 재활치료를 받는 뇌졸중과 척수손상 외래환자를 대상으로 주거 유형, 장애유형, 일상생활 수행 정도에 따른 주거환경개선에 대한 요구도를 알아보고자 하였다. 서울 경기 지역의 재활병원이나 종합병원에서 재활치료를 받는 환자 54명을 대상으로 2012년 1월 2일부터 2월 4일까지 설문조사를 실시하여 기술통계와 $x^2$검정을 이용하여 분석하였다. 연구결과를 살펴보면 주거환경개선에 대한 요구도가 장애 유형에 따라 현관의 계단이나 출입문의 폭, 욕실의 공간이용, 세면대, 양변기, 욕조, 샤워기 걸이와 세면대 높이, 거실과 침실 부엌, 베란다 공간이용 등에서 통계학적으로 유의미한 차이를 보였다. 주거 유형에 따른 주거환경 개선요구는 출입문의 센서 등, 욕실의 휴지걸이와 콘센트 덮개의 개선이 통계학적으로 유의미한 것으로 나타났으며 일상생활 수행정도에 따라 출입문의 폭과 문턱, 욕실의 휴지걸이와 수건걸이, 미끄럼 방지 바닥재, 샤워기, 부엌의 공간과 식탁, 의자, 베란다의 공간이용과 문턱, 조명 밝기의 개선 요구에서 통계적으로 유의미한 차이를 보였다. 본 연구를 통하여 주거 환경 개선에 대한 요구 정도가 장애유형, 주거 유형, 일상생활 수행 정도에 따라 다르다는 것을 확인할 수 있었으며 앞으로 주거환경개선에 대한 평가와 치료적인 접근의 기초자료로써 활용될 수 있을 것이다.

• 대한인간공학회지
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• 제31권2호
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• pp.379-388
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• 2012

Objective: This study developed a new shower carrier prototype to reduce caregivers' muscle burden and to increase use convenience by reflecting the needs of domestic long-term care institutions. Background: In the long-term care institutions, one of the ADL(Activities of Daily Life) factors is bathing/showering. Recently, bath/shower-assisting equipment is actively being introduced in care institutions to reduce the caregivers' care cost, but most of the domestic equipment was designed to imitate foreign products and rarely reflected the needs of care institutions. Method: Based on Korean elderly people's body information, the bed size(length: 1,900mm, width: 650mm) was set-up, and a variable headrest with a newly designed headform was developed to provide the comfort for the elderly and convenience for caregivers. To reduce caregivers' muscle burden on transferring and showering activities, a 3-step column lifting module equipped with dual actuators(lowest/highest levels from the ground: 600/1,100mm, Stroke: 500mm) was developed, and the wheelbase parameter(length: 1,250mm, width: 580mm) was defined securing the turn-over safety of the shower carrier. The drivability tests were performed for the prototype and foreign product, and the male and female subject's muscle activities were measured through the tests. Results: The structural stability of the shower carrier prototype was secured by finite element analysis, and the muscle activities of the subjects through the drivability tests largely decreased in the prototype, compared to the foreign product. Conclusion: In this study, a new shower carrier prototype was developed to possibly reduce caregivers' muscle burden and to increase use convenience based on the needs of long-term care institutions. It was expected that the drivability performance of the prototype could be relatively superior to that of the foreign product. Application: The results obtained from the study can be applied for the optimal development of a shower carrier including other equipment to effectively care for the elderly.