• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.65-70
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• 1999

In this paper, the cost-effective design of output reactor which is used to suppress the over-voltage at the motor terminal in the Adjustable Speed Drives(ASD) application is proposed. In the elevator drive system, the power cable length is relatively shorter than other ASD applications and then the over-voltage at the motor terminal depends on the frequency characteristics of the output reactor at the over-voltage operating frequency. The over-voltage suppression mechanism of output reactor in ASD application is analyzed and the dominant parameters of output reactor for the over-voltage suppression are extracted. Using these parameters as the design values and considering the high frequency characteristics of iron core in the reactor, a new cost-effective structure of output reactor is proposed. Experimental results of the conventional reactor and the proposed reactor with a 15kW induction motor are given to verify the proposed scheme.

• 전력전자학회논문지
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• 제4권5호
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• pp.483-490
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• 1999

본 논문은 전동기 과전압 억제용으로 사용되는 인버터 출력 리액터의 최적 설계 방식을 제시하고 있다. 전력선의 길이가 상대적으로 짧은 엘리베이터 구동 시스템의 인버터 출력단에 리액터를 사용하는 경우, 전동기 선간의과 전압 특성을 과 전압 동작 주파수인 상당한 고 주파수 대역에서의 출력 리액터와 전동기 특성에 의해 좌우된다. 따라서, 고 주파수 대역에서의 출력 리액터 및 전동기의 동작 특성을 분석하고, 출력 리액터의 필요 파라미터를 추출하였다. 이를 리액터의 설계 변수하고, 리액터의 고 주파수 특성을 고주파수 특성을 고려하여, 새로운 구조의 출력 리액터 설계방식을 제안하였다. 통상의 출력 리액터와 제안된 방식의 출력 리액터를 용량 15kW급의 엘리베이터 유도 전동기 구동 시스템에서 비교 실험하여, 제안된 방식의 효과를 검증하였다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제50권12호
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• pp.601-608
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• 2001

The ever increasing density of adjustable speed drives(ASD) device with non-linear operating characteristics has been to put tremendous harmonic stress on end user's electrical application. All ASD controllers which employ solid state power devices cause harmonic currents in the source side line. This paper describes harmonic problems for use of ASD. In order to investigate the effect of harmonics caused by using of nonlinear load at the low voltage system, we fixed up simple load model and measured the voltage and current waveforms. Measurement results show that additional operation of linear load at the parallel bus with nonlinear load such as ASD is helpful to the reduction of harmonic influence.

• 창의정보문화연구
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• 제5권3호
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• pp.329-343
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• 2019

본 연구에서는 자폐성장애 학생들의 사회적 기술 향상을 위한 상황이야기 중재 콘텐츠를 담은 모바일 애플리케이션을 개발하고 평가하였다. 본 연구를 위해 자폐성장애 학생을 지도해 본 경험이 있는 교사 20명을 대상으로 요구조사를 실시하여 애플리케이션의 필요성을 확인하였고, 요구조사의 결과를 바탕으로 자폐성장애 학생의 특성과 요구를 고려한 모바일 애플리케이션을 개발하였다. 개발된 애플리케이션은 안드로이드 앱 스토어에 심사를 거쳐 등록하고, 현장 교사 10명에게 휴리스틱 사용성 평가를 진행하였다. 평가 결과 교육적 가치, 콘텐츠 구현 기술, 콘텐츠 정보 및 편의성 영역에서 모두 '매우 양호'에 가까운 결과를 얻었으며, 평가 결과에서 제시된 보완해야 할 사항들을 반영하여 애플리케이션을 완성하였다. 본 연구는 장애 학생의 사회적 기술 지도와 관련된 소프트웨어가 전무한 실정에서 관련 소프트웨어 개발 연구 활성화에 토대가 될 것으로 기대된다.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제32권3호
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• pp.112-117
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• 2021

Objectives: This study identified changes in social communication and interaction among children with autism spectrum disorder (ASD) through Theraplay. Methods: This study included 20 children who were diagnosed with ASD by a child and adolescent psychiatrist and were recommended to undergo Theraplay in 2012-2017. The Marschak interaction method was used to identify and analyze the interactions between parents and their children. The Korean version of the Social Communication Questionnaire (K-SCQ) was used to evaluate symptoms of ASD. The Wilcoxon signed-rank test was used to compare the differences before and after Theraplay. Results: Upon comparing the differences in total K-SCQ scores, there were statistically significant changes (z=-3.269, p=0.001) in children with ASD. Changes were also confirmed in each category, namely social interaction, communication, and limited and repetitive behavior patterns (p=0.011, p=0.025, p=0.039, respectively). Conclusion: This study found that Theraplay may cause significant changes in social communication in children with ASD. Further studies are needed to establish the effectiveness of Theraplay in children with ASD.

• 대한통합의학회지
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• 제9권2호
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• pp.131-140
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• 2021

Purpose : The purpose of this study was to systematically review the studies on the effects of social story intervention on the individuals with autism spectrum disorders(ASD) to provide the basis for evidence-based practice. Methods : In order to find out the studies on the effect of social story intervention on individuals with ASD, studies published from 2011 to December 2020 were searched on Google Academic Search. The keywords used were "autism spectrum disorder AND social story". A total of 16,900 studies were searched, and from these, 12 studies were selected based on the application of the selection and exclusion criteria. The included studies comprised of 10 single subject design studies and 2 randomized controlled trials design studies. The included studies were analyzed in accordance to population, intervention, outcome measures and results. Results : As a result of analysing the subjects of the included studies, we found out that pre-school children and adolescents were the most common groups of individuals diagnozsed with ASD. In addition to ASD, the diagnosis of the subjects included intellectual disability, Asperger, and Prader-willi. We found out that there were more interventions that were mixed with other interventions, than just the pure social story interventions. In particular, video modeling was found to be the most frequent intervention. This was followed by photo-based social stories. For outcome measure, autism social skills profile was found to be the most often used standardized assessment. For a non-standardized assessment, social desired behavior was found to be the most frequently evaluated behavior, followed by personal problem behavior. Of all the dependent variables, the dependent variable reported as "effective" was the most, followed by "some effective". Conclusion : This study is organized to help the individuals with ASD, families, researchers, and therapists understand the effects of social story intervention on the individuals with ASD in an easy fashion. Further, therapists can use this study as the basic data for evidence-based practice.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.591-604
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• 2008

In this study, two design examples of drilled shafts on soft ground in Ho-Chi-Minh City, Vietnam are introduced. One is for a 27-story apartment and the other is for a Arch bridge over Saigon river. Unlikely the normal cases in Korea, all of the bored pile foundations are supposed to be placed on soil layers. Therefore, skin friction between pile and ground is the most crucial design parameter. Three methods using SPT N value of sandy soil -Korean Road Bridge Code(1996), Reese and Wright (1977), and O'Neill and Reese (1988)- were adopted to obtain an ultimate axial bearing capacity. In order to verify the calculated bearing capacity, 3 sets of static load test and a Osterberg Cell test were performed at an apartment site and a bridge site respectively. LRFD (Load Resistance Factored Design) method was compared with ASD (Allowable Stress Design) method. On application of ASD method, safety factor for skin friction was adopted as 2 or 3 while safety factor for end bearing was 3. The design bearing capacities from ASD method matched well with those from LRFD method when safety factor for skin friction was adopted as 2.

• 대한한방소아과학회지
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• 제35권3호
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• pp.28-42
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• 2021

Objectives The purpose of this study is to investigate the effect of Tuina treatment for children with Autism Spectrum Disorder (ASD), and to propose guidance to future studies or application in clinical setting. Methods The articles published from year 2000 to May 2021 by China National Knowledge Infrastructure (CNKI) were searched by setting up field as '中醫學', '中藥', '中西醫結合' and by setting up keyword as '小儿自閉症', '儿童自閉症', '自閉症譜系障碍', 'Autism', 'Autism spectrum disorder' that corresponds to participant and '推拿', '導引', '按摩', 'Tuina', 'massage'. Results Nine selected articles were analyzed and summarized by authors and year published, characteristics, diagnostic criteria, treatment methods and contents, treatment duration, evaluation criteria and results of the study. The articles were also reviewed by reported side effects, and evaluated the quality of the study according to Cochrane Handbook's Risk of Bias 2 (RoB 2) assessment of the Randomized Control Trial (RCT) articles. All studies used Tuina treatment to achieve effective results for pediatric autism spectrum disorder. Conclusion Pediatric Tuina treatment (TM) is a non-invasive treatment that does not stimulate patients with unstable ASD but increase patient adherence, and can be safely and simply operated. Therefore, pediatric Tuina treatment is worth utilizing as a clinical basis for further development of ASD treatment.

• ETRI Journal
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• 제44권4호
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• pp.613-623
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• 2022

Autism spectrum disorder (ASD) is a developmental disorder associated with cognitive and neurobehavioral disorders. It affects the person's behavior and performance. Autism affects verbal and non-verbal communication in social interactions. Early screening and diagnosis of ASD are essential and helpful for early educational planning and treatment, the provision of family support, and for providing appropriate medical support for the child on time. Thus, developing automated methods for diagnosing ASD is becoming an essential need. Herein, we investigate using various machine learning methods to build predictive models for diagnosing ASD in children using facial images. To achieve this, we used an autistic children dataset containing 2936 facial images of children with autism and typical children. In application, we used classical machine learning methods, such as support vector machine and random forest. In addition to using deep-learning methods, we used a state-of-the-art method, that is, automated machine learning (AutoML). We compared the results obtained from the existing techniques. Consequently, we obtained that AutoML achieved the highest performance of approximately 96% accuracy via the Hyperpot and tree-based pipeline optimization tool optimization. Furthermore, AutoML methods enabled us to easily find the best parameter settings without any human efforts for feature engineering.

• 한국융합학회논문지
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• 제8권7호
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• pp.341-348
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• 2017

본 연구는 K-WISC-IV 프로파일을 통해 고기능 자폐 스펙트럼 장애(ASD) 아동의 인지적인 특성을 확인하여 고기능 ASD 아동의 진단에 도움을 주며, 임상 및 교육 장면에서 효과적인 개입을 위한 정보를 제공하는데 목적이 있다. 이에 6~16세의 고기능 ASD 아동 90명을 대상으로 K-WISC-IV의 전체 IQ, 지표 점수와 소검사 환산점수의 평균을 살펴보았으며, 이와 같은 점수들이 규준 집단과 차이가 있는지 확인하고자 단일 집단 t 검정을 시행하였다. 그 결과 처리속도 지표, 작업기억 지표에서 고기능 ASD아동이 규준 집단에 비해 유의하게 낮은 점수를 얻었고, 소검사 수준에서는 이해, 공통그림찾기, 빠진 곳찾기, 순차연결, 산수, 동형찾기, 기호쓰기에서 유의미하게 부진한 수행을 보였다. 다시 말해, K-WISC-IV 프로파일을 통해 고기능 ASD 아동들이 처리 속도가 느리고 사회적 판단력이 부족하며 비언어적인 자극을 빠르게 포착하거나 시각 자극의 핵심적 측면을 파악하는 것이 어렵다는 특성을 알 수 있었다.