• 한국보육지원학회지
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• 제12권4호
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• pp.71-92
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• 2016

In this study, authors investigated the attachment of toddlers to their mothers and teachers and overall development based on their gender differences. The subjects of the study are 80 toddlers who are 25~36 months, their mothers, and teachers. We analyzed our data using t-test and two way ANOVA, and the results are as follows. First, the groups categorized by the types of the attachment between the toddlers and the mothers and the gender difference demonstrated the developmental distinctions, respectively. The interactional effects of the two factors emerged in communication and basic living. Second, the groups categorized by the types of the attachment between the toddlers and the teachers and the gender difference demonstrated the developmental distinctions, respectively. The interactional effects of the two factors emerged in gross motor skills, fine motor skills, and cognition. Third, with respect to the types of multiple attachments to mothers and teachers, toddler development brought meaningful differences. We discussed the importances of the attachment of the toddlers and the role of teachers based on the results of our research and proposed future projects and suggestions.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제5권4호
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• pp.181-186
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• 2016

무인항공기(Unmanned Aerial Vehicle, UAV)는 짧은 시간 동안 넓은 범위의 정찰이 가능하기 때문에 최근에는 이를 활용한 감시 시스템 연구가 주목을 받고 있다. 넓은 범위를 감시할 때 조종사가 반복적으로 UAV를 비행시키는 것은 운영에 필요한 비용 문제가 발생한다. 감시를 위한 비행경로를 사전에 정의할 수 있다면 이를 기반으로 UAV를 자율 비행시켜 비용 문제를 해결할 수 있다. 전통적인 접근 방법은 GPS를 기반으로 비행할 경로를 다수 개의 모터프리미티브로 정의한다. 하지만, UAV가 감시할 지점이 모터프리미티브에 반영되지 않아 감시가 제대로 수행되지 못하는 문제가 발생한다. 이 논문에서는 감시용 UAV를 자율 비행시키기 위한 모터프리미티브의 구조를 제안한다. 모터프리미티브는 감시 대상을 정확히 기술하기 위해서 자동으로 감시할 지점을 선택하여 생성된다.

• 한국입자에어로졸학회지
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• 제15권4호
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• pp.139-148
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• 2019

This study was performed for the application of a high-speed centrifugal cyclone to shale gas mining process. This device uses the centrifugal force to control particles similar to typical cyclones, and the disk located inside the cyclone is forced to rotate using a motor. The pressure difference occurred during the rotating of disk. Hence, inflow rate was generated without a blower fan. In addition, flow rate increased with elevating rpm of motor. The installing the disk in multiple stages on the inner rotor increased the instantaneous disk outlet flow. Hence, the control efficiency of oil particle increased from 1.05% to 31.2%. By modifying the structure of the disk so that the air flow to the opposite direction of the cyclone, the control efficiency of oil particles increased to 81.5%. By increasing the capacity of the motor and the size of the disk, the flow rate was increased to 2.5 ㎥/min because the rpm of motor and pressure difference increased. As rpm of motor increased, the cut-off diameter (d_pc) became smaller. Unlike the Lapple's equation, d_pc was inversely proportional to the effective number of rotations (N_e). The control efficiency was maintained even if the concentration of oil particles increased, for this reason, the higher the oil concentration, the more particles were accumulated and controlled.

• Annals of Clinical Neurophysiology
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• 제19권1호
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• pp.34-39
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• 2017

Background: Automated nerve excitability testing is used to assess various peripheral neuropathies and motor neuron diseases. Comparing these excitability parameters with normal data provides information regarding the axonal excitability properties and ion biophysics in diseased axons. This study measured and compared normal values of axonal excitability parameters in both the distal motor and sensory axons of normal Koreans. Methods: The axonal excitability properties of 50 distal median motor axons and 30 distal median sensory axons were measured. An automated nerve excitability test was performed using the QTRACW threshold-tracking software (Institute of Neurology, University College London, London, UK) with the TRONDF multiple excitability recording protocol. Each parameter of stimulus-response curves, threshold electrotonus, current-voltage relationship, and recovery cycle was measured and calculated. Results: Our Korean normal data on axonal excitability showed ranges of values and characteristics similar to previous reports from other countries. We also reaffirmed that there exist characteristic differences in excitability properties between motor and sensory axons: compared to motor axons, sensory axons showed an increased strength-duration time constant, more prominent changes in threshold to hyperpolarizing threshold electrotonus (TE) and less prominent changes in threshold to depolarizing TE, and more prominent refractoriness and less prominent subexcitability and superexcitability. Conclusions: We report normal data on axonal excitability in Koreans. These data can be used to compare various pathological conditions in peripheral nerve axons such as peripheral neuropathies and motor neuron disease.

• 한국컴퓨터정보학회논문지
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• 제19권2호
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• pp.21-30
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• 2014

최근 산업 현장에서 유도 전동기의 사용이 증대되고 있으며, 유도 전동기는 산업 현장에서 중요한 역할을 하고 있다. 따라서 유도 전동기의 결함으로 인한 피해를 최소화하기 위해 유도 전동기의 결함 검출 및 분류 시스템의 개발이 중요한 문제로 대두되고 있다. 따라서 본 논문에서는 유도전동기의 결함을 조기에 식별하기 위해 선형예측 코딩(LPC)기법과 Expectation Maximization(EM) 알고리즘을 이용하여 각각의 유도 전동기 고장의 스펙트럼 포락처리 모델을 추정한다. 앞서 두 기법을 사용하여 추정된 고장 유형 모델과 마할라노비스 거리(MD) 기법을 사용하여 유도전동기의 결합을 분류한다. 또한 제안된 알고리즘 성능을 평가하기 위해 기존에 제안된 진동 신호의 특징을 이용한 유도 전동기 결함 분류 알고리즘과 분류 정확도 측면에서 성능을 검증하였다. 실험 결과, 제안하는 알고리즘은 잡음이 없는 환경 및 잡음이 섞인 환경에서도 높은 분류 성능을 보였다.

• PNF and Movement
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• 제12권2호
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• pp.123-132
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• 2014

Purpose: The discovery of mirror neuron system may positively affect functional recovery; therefore, rehabilitation is needed that is practical for use in clinical settings. The purpose of this study was to examine the effect of action observation training on upper motor function in people who had suffered strokes. Methods: Three elderly patients with stroke, aged to years, were recruited from a stroke rehabilitation center. A nonconcurrent, multiple baseline subject approach was taken, with an A-B-A treatment single-subject experimental design, and the experiment was conducted for 3 weeks. The action observation training was repeated 5 times in 5 days during the intervention period. The arm function, including WMFT, BBT, and grip and pinch strength, was evaluated in each subject 5 times during the baseline period, the intervention period, and the baseline regression period. Results: The results of the evaluation for each subject were presented as mean values and video graphs. The WMFT scores of 2 subjects were improved during the intervention period in comparison with the baseline period, and this improvement was maintained even during the regression baseline period. The BBT and the grip and pinch strength were not improved. Conclusion: Based on these results, we suggest that the action observation training for 5 sessions was effective in improving upper limb function of stroke patients but was not effective in improving hand dexterity or grip and pinch strength.

• 로봇학회논문지
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• 제2권2호
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• pp.137-142
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• 2007

In an information-oriented society, visually impaired persons also should obtain the information with relative ease. They tend to receive the information of letters by tactile sensation through braille display systems. Several types of braille display systems have been suggested so far, but none of them have been widely used yet. The braille display system should provide multiple lines of braille units to improve the level of understanding. In this paper, we propose a cell type braille unit with $3{\times}2$ dots, each of which consists of a piezoelectric linear motor. A braille cell is small and lightweight enough to be portable, and it can be easily assembled in multiple lines. The preliminary tests using the proposed braille display system show that it can provide the information that can be well perceived by visually impaired persons.

• 음성과학
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• 제10권4호
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• pp.221-227
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• 2003

Diadochokinetic (DDK) speech task has been utilized as an evaluating tool for speakers with dysarthria for many years. This study attempted to differently diagnose multiple system atrophy (MSA) from idiopathic Parkinson's disease (PD) using patients' performance of DDK (i.e., alternate motion rate (AMR)). The subjects included 11 cases of pathologically confirmed MSA and 16 IPD patients who commonly presented with parkinsonian syndrome. The speech sample of each patient was analyzed acoustically using the MSPTM(Motor Speech Profile, a module of CSL). The results showed that the average DDK rate was significantly faster in the IPD than the MSA groups in all three syllables (i.e., /puh/, /tuh/. and /kuh/). We propose the average DDK rate variable as a core clinical trait in differentiating the two pathological conditions.

• 한국콘텐츠학회논문지
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• 제16권1호
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• pp.676-687
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• 2016

본 연구는 지역사회에 거주하는 파킨슨병환자의 운동기능, 우울, 낙상공포의 관계를 파악하고 낙상공포에 미치는 영향요인을 규명하기 위한 것이다. 대상자는 편의표집에 의해 선정된 파킨슨병환자 180명이다. 수집된 자료는 IBM SPSS Statistics 20.0을 이용하여 기술통계, t-test, ANOVA, Pearson correlation coefficient와 multiple linear regression으로 분석하였다. 그 결과, 파킨슨병환자는 여성, 직업이 없는 경우. 보행보조기구 사용자, 2회 이상 낙상 경험자, 파킨슨병 4단계 환자, 유병기간이 9년을 초과한 경우, 항고혈압제 복용 환자, 독립적 운동수행력 하위군, 우울이 있는 경우 낙상공포가 더 높게 나타났다. 낙상공포는 운동기능 및 우울과 유의한 순상관관계를 나타냈다. 파킨슨병환자의 낙상공포의 영향요인은 우울, 낙상횟수, 파킨슨병 단계, 성별, 항고혈압제, 운동기능으로 변량의 36.0%의 설명력을 나타냈으며 영향요인 중 우울이 가장 강력한 요인으로 나타났다. 따라서 지역사회 거주하는 파킨슨병환자의 낙상공포를 예방하기 위해서는 영향요인에 대한 체계적 간호사정과 함께 우울을 완화할 수 있는 중재전략이 필요함을 제시해 주었다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.459-462
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• 2017

본 캡스톤 디자인은 대형 헤어드라이어를 제작하여 사용자의 머리카락을 건조시키는 시간을 단축하는 시험을 수행하였다. 열풍 메카니즘을 이용한 대형 헤어드라이어를 제작하기 위해서는 바람의세기 및 안전성을 결정하는 요소는 '모터'이다. 일반적인 헤어 드라이어기는 5V 또는 12V DC모터를 이용하여 풍속을 결정하고, 외부 통풍구가 단일 블로우로써 사용시간이 길고 소모 전력도 큰 문제점이 있다. 본 제작에서는 다중 블로우를 이용한 대형 헤어드라이어의 경우 짧은 시간에 풍속의 세기를 증가시켜 소모 전력을 줄일 수 있는 헤어드라이어 기를 제작하였다. 평균 건조 시간을 단축하기 위해 모터의 효율성과 외부 프레임의 블로우 위치성, 소비 전력을 파악하여 헤어드라이어기 모터의 효율성을 검증하였다.