• Clinical and Experimental Pediatrics
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• 제52권3호
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• pp.289-294
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• 2009

목 적 : 언어 발달 지연아들에게 흔히 시행되는 검사들로서 뇌 자기공명 영상, 염색체 핵형분석, 뇌 전위 유발검사, 뇌파, Tandem mass 선별검사 및 6종 선천성 대사질환 선별검사가 원인 질환의 진단에 유용한 지를 알아보고자 본 연구를 시행하였다. 방 법 : 2000년 1월부터 2007년 6월까지 언어 발달 지연을 주소로 영남대학교 부속병원 소아신경클리닉에서 신경심리검사와 원인 질환에 대한 검사를 받았던 122명의 환아를 대상으로 의무 기록을 검토하여 증례별로 현상학적 질환의 범주로 나누고 원인/연관 추정 소견 여부를 확인한 후 검사의 양성률과 원인 질환의 진단에서의 유용성을 분석하는 후향적 연구를 시행하였다. 결 과 : 대상 환아 122예에서 정신지체 47예(38.5%), 발달성 언어장애 40예(32.8%), 경계선 지능이 23예(18.9%) 그리고 자폐 범주 질환이 12예(9.8%)였다. 원인/연관 추정 소견은 26예(21.3 %)에서 찾을 수 있었으며 이형 증후군이 5예, 소두증이 4예, 미숙아 분만 및 신생아 가사의 병력을 가진 경우가 3예, 저출생 체중아가 3예, 양육된 환경적인 요인이 문제였던 경우가 3예 등의 순으로 많았다. 검사 소견으로 자기공명 영상 77예 중 8예(10.4%), 뇌파 75예 중 6예(8.0%)에서 이상 소견이 관찰되었고 뇌 전위 유발검사 80예 중 양측 이상을 보인 경우가 4예(5%)있었으나 2예에서는 추적 관찰시 정상화되었다. 염색체 핵형분석 80예, Tandem mass 선별검사 67예와 대사질환에 대한 신생아 선별검사 15예에서 이상 소견이 관찰된 경우는 없었다. 검사 소견 중 뇌 자기공명 영상은 대뇌 겉질 형성 이상 1예의 확진과 뇌량 형성 부전 3예와 뇌연화증 1예의 원인 질환 추정에, 그리고 뇌 전위 유발검사는 청각 장애 2예의 확진에 도움이 되었다. 결 론 : 언어 발달 지연의 원인 질환의 진단 시 흔히 시행되는 검사들은 유용성이 크지 않으며 검사의 시행은 증례의 특징에 따라 선별적으로 시행하는 것이 바람직하다. 그러나 원인 질환의 진단에는 도움이 되지 않는다고 하더라도 검사에서 이상 소견이 관찰되는 경우가 적지 않으므로 언어 발달 지연의 전체적인 평가에는 이들 검사의 의미에 대해서는 좀 더 연구가 필요하다.

• The Journal of the Acoustical Society of Korea
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• 제17권2E호
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• pp.38-46
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• 1998

In this paper, we propose a remote speech input device, a new method of user-friendly speech input in spontaneous speech recognition system. We focus the user friendliness on hands-free and microphone independence in speech recognition applications. Our method adopts two algorithms, the automatic speech detection and the microphone array delay-and-sum beamforming (DSBF)-based speech enhancement. The automatic speech detection algorithm is composed of two stages; the detection of speech and nonspeech using the pitch information for the detected speech portion candidate. The DSBF algorithm adopts the time domain cross-correlation method as its time delay estimation. In the performance evaluation, the speech detection algorithm shows within-200 ms start point accuracy of 93%, 99% under 15dB, 20dB, and 25dB signal-to-noise ratio (SNR) environments, respectively and those for the end point are 72%, 89%, and 93% for the corresponding environments, respectively. The classification of speech and nonspeech for the start point detected region of input signal is performed by the pitch information-base method. The percentages of correct classification for speech and nonspeech input are 99% and 90%, respectively. The eight microphone array-based speech enhancement using the DSBF algorithm shows the maximum SNR gaing of 6dB over a single microphone and the error reductin of more than 15% in the spontaneous speech recognition domain.

• 음성과학
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• 제9권4호
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• pp.77-91
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• 2002

This study investigated the use of grammatical morphemes (substantive morphemes and connective endings) of Korean speaking children with and without language impairment (LI). Participants were two children (ages 5;11 and 6;2) with SLI (specific language impairment), two LD (language delay) children (ages 6;3 and 6;5) with 70-84 range on a performance-IQ test, and two children (ages 5;7 and 6;1) with ND (normal development). Spontaneous language samples were elicited by play activities and story generation. A total of 8,059 (M=I,343, ranged 966-1,659) intelligible and nonimitative utterances were analyzed by the KCLA 2.0 (Korean Computerized Language Analysis 2.0) program for substantive morphemes and connective endings. The findings of this study were as follows; (1) The Korean speaking children with LI including SLI demonstrated less uses of grammatical morphemes than ND children. (2) Few differences were found between LI and ND children in the use of the grammatical morpheme types. (3) LI children produced significantly higher percentage of grammatical morpheme errors in spontaneous speech than ND children. (4) Few differences were found between SLI and LD children in degrees of the use and the error of grammatical morphemes.

• Clinical and Experimental Pediatrics
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• 제60권10호
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• pp.312-319
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• 2017

Purpose: To evaluate the usefulness of the Korean Developmental Screening Test (K-DST) for infants and children for developmental delay assessment. Methods: This study was based on retrospective studies of the results of the K-DST, Preschool Receptive-Expressive Language Scale (PRES), Sequenced Language Scale for Infants (SELSI), Childhood Autism Rating Scale (CARS), Modified Checklist for Autism in Toddlers (M-CHAT), electroencephalography, magnetic resonance imaging, and extensive tests conducted in 209 of 1,403 patients, of whom 758 underwent the K-DST at the Korea University Guro Hospital between January 2015 and December 2016 and 645 were referred from local clinics between January 2015 and June 2016. Results: Based on the K-DST results, the male children significantly more frequently required further or follow-up examination than the female children in most test sections, except for gross motor. The male children had notably lower mean scores than the female children. The PRES/SELSI results showed that when more further or follow-up evaluations were required in the K-DST communication section, significantly more problems in language delay or disorder emerged. When further or follow-up evaluation was required in the cognitive section in the CARS/M-CHAT, the possibility of autism increased significantly. A child tended to score low in the CARS test and show autism when further or follow-up evaluation was recommended in the K-DST. Conclusion: This study demonstrated the usefulness of the K-DST as a screening test early in the development of infants and children in Korea. Data of normal control groups should be examined to determine the accuracy of this investigation.

• 대한한방소아과학회지
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• 제24권2호
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• pp.1-12
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• 2010

Objectives Taking detailed patient history helps earlier diagnosis and treatment of developmental disability. In this study we analyzed the clinical questionnaire to find out the clinical characteristics of those with five-retardation, five-limpness, or five-stiffness. Methods The data was collected from 484 children under the age of six who have visited H oriental medicine clinic for developmental delay. The clinical questionnaire was filled out by their parents and the data was analyzed statistically. Results 436 children showed symptoms of five-retardation, 90 children suffered from five-stiffness, 54 children showed five-limpness and 7 children suffered from five-stiffness and five-limpness complex. Generally, boys had higher chance to show disease symptoms than the girls (2.32:1) and 40 children (8.26%) reported family history of developmental disability. Cerebral palsy ranks the most common familial disease, followed by developmental delay, mental retardation, autistic disorder and language disorder. Among the children we have studied, 285 children (63.19%) showed delayed unassisted walk while 192 children (42.57%) had language disorder. Also, 138 children (28.51%) had both walk and language disorders. The children in this study also showed delayed toilet training and half of them had little stranger anxiety when they were infants. It was also found that 120 children (24.79%) experienced epilepsy. This study reaffirmed that low birth weight, premature birth, and suffocation are major risks causing neurological damage. Conclusions They had history which including family history, problems at birth, epilepsy, face recognition, muscle tone disorder, delayed walking without assistance, language ability, and toilet training.

• 말소리와 음성과학
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• 제12권1호
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• pp.51-63
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• 2020

음운인식은 음운론 영역의 상위언어인식 능력으로, 읽기 및 어휘력 등의 언어능력을 예측하는 것으로 알려져 있다. 본 연구는 음운인식 능력과 기타 음운처리 능력, 그리고 언어능력 간의 관계를 일반아동 집단과 언어발달지연 아동 집단 간 비교를 통해 살펴보고자 하였다. 4~6세의 언어발달지연 아동(n=15)과 일반아동(n=18)을 대상으로 음운인식 능력을 평가하기 위하여 음절수세기, 음절탈락, 음절변별 과제를 실시하였다. 또한 비단어 따라말하기, 숫자 거꾸로 회상하기의 두 가지 음운처리 과제와 수용 및 표현어휘력, 문법성판단 과제와의 상관관계를 분석하고, 언어능력을 예측하는 음운인식 하위과제가 무엇인지 검토하였다. 음운인식 하위과제 중 음절수세기를 제외한 음절탈락, 음절변별 과제 수행력의 집단 간 차이가 유의하였다. 또한 일반아동 집단은 음절탈락과 숫자 거꾸로 회상하기, 음절변별과 수용어휘력 과제 수행력 간 상관관계가 유의하였으며, 언어발달지연 아동 집단은 음절수세기 과제와 숫자 거꾸로 회상하기, 수용어휘력, 표현어휘력, 문법성판단 과제의 수행력 간 상관관계가 유의하였다. 그리고 단계적 중다회귀분석 결과 일반아동 집단은 음절변별 과제가 수용어휘력 및 문법성판단 과제 수행력을 유의하게 예측하는 것으로 나타났으며, 언어발달지연 아동 집단은 음절수세기 과제가 수용어휘력, 표현어휘력, 문법성판단 과제 수행력을 유의하게 예측하는 것으로 나타났다. 언어발달지연 아동 집단은 일반아동 집단에 비해 음절수세기를 제외한 나머지 음절 수준의 음운인식 과제의 수행력이 저조하였으며, 이러한 특징이 상관관계 분석 및 회귀분석 결과에도 반영되었다. 또한 각 집단에서 음운인식 과제 수행력이 언어능력을 유의하게 예측하는 것으로 나타난 결과는 음운론 영역의 상위언어인식 능력의 중요성을 시사한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.1009-1012
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• 1998

An efficient algorithm for clock skew optimization is proposed in this paper. It construct a new clock routing topology which is the generalized graph model while previous methods uses tree-structured routing topology. Edge-insertion technique is used in order to reduce the clock skew. A link-edge is inserted repeatedly between two sinks whose delay difference is large and the distance is small. As a result, the delay of a sink which has the longer delay is decreased and the clock skew is reduced. The proposed algorithm is implemented in C programming language. From the experimental results, we can get the total wire length minimization under the given skew bound.

• 대한음성학회:학술대회논문집
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• 대한음성학회 2006년도 춘계 학술대회 발표논문집
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• pp.89-93
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• 2006

This paper presents ETRI broadcast news speech recognition system. There are two major issues on the broadcast news speech recognition: 1) real-time processing and 2) out-of-vocabulary handling. For real-time processing, we devised the dual decoder architecture. The input speech signal is segmented based on the long-pause between utterances, and each decoder processes the speech segment alternatively. One decoder can start to recognize the current speech segment without waiting for the other decoder to recognize the previous speech segment completely. Thus, the processing delay is not accumulated. For out-of-vocabulary handling, we updated both the vocabulary and the language model, based on the recent news articles on the internet. By updating the language model as well as the vocabulary, we can improve the performance up to 17.2% ERR.

• 제어로봇시스템학회논문지
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• 제14권2호
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• pp.184-190
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• 2008

This paper describes a message model based on XML (eXtensible Markup Language) to present real-time data from sensors and instruments at manufacturing processes for web service. HTML (Hyper Text Markup Language) is inadequate for describing real-time data from process control plants while it is suitable for displaying non-real-time multimedia data on web. For XML-based web service of process data, XML format for the data presentation was proposed after investigating data of various instruments at steel-making plants. Considering transmission delay inevitably caused from increased message length and processing delay from transformation of raw data into defined format, which was critical for operation of a real-time system, its performance was evaluated by simulation. In the simulation, we assumed two implementation models for conducting the transformation function. In one model, transformation was done at an SCC (Supervisory Control Computer) after receiving real-time data from instruments. In the other model, transformation had been carried out at instruments before the data were transmitted to the SCC. Various tests had been conducted under different conditions of offered loads and data lengths and their results were described.

• 한국산학기술학회논문지
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• 제15권7호
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• pp.4198-4211
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• 2014

연구의 목적은 일반 유치원에서 통합교육활동이 발달지체 아동의 사회적 기술 향상에 미치는 효과를 알아보는 것이다. 연구대상자는 경상남도 김해시에 소재하고 있는 특수학교 유치부에 재학 중이며, 모든 영역에서 발달이 지체되어 있는 아동 3명이다. 실험 방법은 발달지체 아동과 비장애 아동의 다양한 교육활동을 촬영한 후 그 결과를 분석하였다. 연구결과, 세 아동들이 언어적, 인지적, 정서적 특성의 차이에 의한 사회적 기술을 학습으로 변화했고, 광범위한 교육 활동은 협력기술, 의사소통기술, 자기통제 기술 향상에 효과가 있었다.