• 대한기계학회논문집B
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• 제37권6호
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• pp.545-550
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• 2013

본 논문은 정전기력을 이용한 마찰력 변조를 이용하여 손끝을 통한 촉각정보의 입출력을 동시 구현하는 소자를 제안하였다. 기존의 촉각소자들이 촉각정보의 입력 및 출력을 개별적으로 구현한 것에 비해 본 연구는 손끝의 수직/수평 방향 동작 인식과 질감 구현을 동시에 구현하였다는 점에서 차별성을 가진다. 실험분석을 통해 검증한 손끝 동작 인식기능은 수직방향의 클릭의 경우 0.146nF/$40{\mu}m$, 수평방향의 경우 0.09nF/$750{\mu}m$의 정전용량 변화를 통해 인식 가능하였으며, 질감 구현의 경우 정전기적 인력을 통해 마찰력을 32~152mN의 범위에서 제어할 수 있음을 확인하였다. 교류전압을 이용한 수평적 진동은 60V, 3Hz에서 최대 128.1mN의 마찰력 변조를 구현하였으며, 이는 기존 연구 대비 32% 향상을 보여준다. 본 연구는 손끝에서 정보의 입출력을 동시 구현하여 정보기기의 촉각인터페이스에 적용 가능하다.

• 지역사회간호학회지
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• 제16권4호
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• pp.458-466
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• 2005

Purpose: The purpose of this study was to determine the relation between test anxiety and mental health in adolescents. Method: The subjects were 450 students of two academic high schools in J City, who were selected through convenient sampling. Data were collected through a survey using a structured questionnaire from September 1st to 15th 2005. Collected data were analyzed using SPSS 10.0 for Windows through descriptive analysis, Pearson's Correlation Coefficient, t-test, ANOVA, Scheffe's test and stepwise multiple regression. Result: The mean score of test anxiety was 2.40 (range:1.13-3.81) and that of mental health was 2.77 (range:0.64-5.03). A significant negative correlation was observed between test anxiety and mental health (r=-0.28, p=.000). Test anxiety was significantly different according to adolescents' general characters such as gender (t=-1.98, p=.048), grade (F=3.54, p=.030), school life satisfaction (F=10.73, p=.000) and relationship with the teacher (F=11.60, p=.000). Mental health was significantly different according to adolescents' general characters such as religion (t=2.14, p=.032) and school life satisfaction (F=4.13, p=.017). The most powerful predictor of mental health was test anxiety and it, combined with religion, accounted for 9.0% of variance in mental health in adolescents. Conclusion: Test anxiety and mental health was found to be in a significant negative correlation with each other in adolescents. Therefore, nursing intervention programs for adolescents needs to reduce their test anxiety to improve their mental health.

• 한국재료학회지
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• 제5권6호
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• pp.639-643
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• 1995

수소화된 비정질 게르마늄 (a-Ge : H)에 대해 전기전도율이 297-423K 사이에서 연구되었다. 측정된 전기전도율의 Arrhenius 구성에 의해 pre-exponential 인수 $\sigma$$_{0}$ 및 활성화에너지 $E_{c}$- $E_{F}$가 결정되었다. 튀어오름(kink) 온도의 존재로 인해 전기전도율의 arrhenius 구성이 두 exponential 함수에 의해 표현되었고, 이에 의해 결정된 페르미준위의 통계이동계수 ${\gamma}$$_{F}$는 약 8.65$\times$$10^{-3}$eV/K이었으며, $\sigma$$_{0}$는 약 2$\Omega$$^{-1}$$cm^{-1}$ /이었다. 전기전도율 데이터로부터 결함밀도가 수치해석적 방법에 의해 계산되었고, 결함밀도는 측정된 온도영역하에서 약 2배 정도 변화하였다 변화하였다화하였다

• 한국세라믹학회지
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• 제41권8호
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• pp.633-636
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• 2004

The sintering behavior, microstructure and microwave dielectric properties of Ca $Ti_{0.5}$F $e_{0.25}$N $b_{0.25}$ $O_3$ with CuO have been investigated. Among the range of additions, 3 wt％ CuO was observed to perform most satisfactory for acting as a sintering aid. The dielectric properties were found to strongly depend on the sintered densities. The dielectric constant increased with sintering temperatures, while the Q${\times}$ $f_{0}$ value affected by second phase. For Ca $Ti_{0.5}$F $e_{0.25}$N $b_{0.25}$ $O_3$ with 3 wt％ CuO sintered at 100$0^{\circ}C$ for 2 h, the dielectric properties with an $\varepsilon$$_{r}$ value of 56, a Q${\times}$ $f_{0}$ value of 3,500 GHz and a $\tau$$_{f}$ value of 10 ppm/$^{\circ}C$ were obtained and suggested for practical applications.cations.ons.ons.ons.

• 음성과학
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• 제15권1호
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• pp.87-98
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• 2008

This study compares the pitch production of children using cochlear implants (CI) with that of children with normal hearing. Twenty subjects from six to eight years old participated in the study. Three kinds of sentences were read and analyzed using Visi-Pitch $\blacktriangleright$(KAY Elemetrics, Model 3300). There were no considerable differences between the two groups regarding pitch, mean fundamental frequency (F0) and pitch range. In the cases of the slope value of F0 and duration, however, there were significant differences. Thus, it is concluded that duration and pitch control can be crucial factors in determining the intonation treatment of the children with cochlear implants.

• 말소리와 음성과학
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• 제6권3호
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• pp.23-32
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• 2014

This study presents the prosodic characteristics of 'Motherese' and 'Teacherese (child care teacher and kindergarten teacher)'. 21 mothers and 24 teachers spoke to children in the child care center or kindergarten. Children are in their 4;00-6;11. Speech and articulation rate, number of accentual phrases (APs), number of intonational phrases (IPs), pitch-related factors (f0, pitch range, f0 standard deviation), and intonation slope (mean Absolute, f0, q-tone slope) were measured. 2 groups spoke 2 sentential types (interrogative_ alternative question, declarative_ coordinated sentence) in 2 situations (one accompanied with the children, the other done without children, but pretending as if they were in front of the children). The results indicate that teachers show more noticeable prosodic characteristics than mothers do.

• 전기전자학회논문지
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• 제17권3호
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• pp.234-240
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• 2013

본 논문에서는 단일-극 커패시터 방식의 터치센서를 위한 incremental 델타-시그마 아날로그-디지털 변환기를 설계하였다. 델타-시그마 모듈레이터의 구조는 단일비트 2차 cascade of integrators with distributed feedback(CIFB)를 사용하였으며 $0.18-{\mu}m$ CMOS 공정을 이용하여 제작하였다. Incremental 델타-시그마 아날로그-디지털 변환기의 입력으로 이어지는 센서가 넓은 입력 범위를 얻고 높은 정확성을 가지도록 변환기 앞에 shielding 신호와 디지털적으로 조절 가능한 오프-셋 커패시터를 위치시켰다. 본회로의 공급전압은 2.6 V에서 3.7 V이며 ${\pm}10-pF$의 입력범위를 가지고 fF 이하의 해상도를 필요로 하는 단일-극 커패시터 방식의 터치센서에 적합하다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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• pp.535-536
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• 2008

Multi-layered thin films of ZnS/$Na_3AlF_6$/ZnS/Cr were deposited on glass substrate by evaporation process. ZnS and $Na_3AlF_6$ were selected as high and low refractive index material, and additionally Cr was chosen as mid reflective layer respectively. The multi-layered thin films were prepared in terms of different optical thickness and different staking sequence and layers. The optical properties were systematically characterized with different optical thickness of $Na_3AlF_6$ especially $0.25\lambda$ and $0.5\lambda$. In order to expect the experimental result, the simulation program, the Essential Macleod Program(EMP) was adopted. Based on the results taken by spectrophotometer at viewing angle $45^{\circ}$, the ZnS/$Na_3AlF_6$/ZnS/Cr multi-layered thin film shows purple colour range in $0.25\lambda$， bluish green in $0.5\lambda$, red purple in $0.75\lambda$, and purple in $1.0\lambda$ respectively.

• 한국토양비료학회지
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• 제46권4호
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• pp.231-236
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• 2013

This study was conducted to investigate the yield response of soybean to drought stress in 1984 and 1986 at the experiment field of the National Academy of Agricultural Science using experiment plots with different soil water tension and fertilizer levels. The average yield response factor (YRF) of soybean to evapotranspiration (ET) calculated as [(Ya/Ym)/(ETa/ETm)], where Ya, average yield; Ym, maximum yield; ETa, average ET; and ETm, maximum ET, was 0.91 with the range from 0.74 to 1.16. Relationship between yield index (YI=[Ya/Ym]) and evapotranspiration index (ETI=[ETa/PET]) was $YI=0.87{\cdot}(ETI)+0.09$. Relationship between YI and the maximum soil water tension (Hmax) was $YI=1.23-0.23{\cdot}{\log}$ (Hmax). Relationship between YI and the days of drought stressed (Dr) was $YI=0.877{\cdot}{\exp}$ ($-0.01{\cdot}Dr$). The relation between YI and fertilizer level (F) was $YI=-0.21{\cdot}F2+0.36{\cdot}F+0.33$, under very serious drought condition as the maximum soil water tension was 0.3 MPa.

• 한국추진공학회지
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• 제9권3호
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• pp.49-59
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• 2005

파형벽면이 존재하는 채널유동에 대한 난류열전달이 난류모델에 의해서 조사되었다. Park et at.[1]의 비선형 k- f - f$_{모델이 수정되었고, 외재적인 비선형 열유속모델이 사용되었다 선택된 레이놀즈수는 Re$_{b}$ =6760이고 형상변화 (0 $\leq$ $\alpha$/$\lambda$$\leq$0.15 and 0.25 $\leq$A/H$\leq$4.0.)에 따른 열전달을 조사하였다. 모델의 성능을 검증하기 위하여 큰에디모사법이 선택된 경우에 수행되었다. 큰에디모사법의 결과와 비교할 때 모델성능은 일반적인 경향을 잘 예측하였다. 비선형 k- $\varepsilon$ - f$_{모델을 이용하여 파형벽면에 의한 열전달의 증가 특징과 형상의 영향이 조사되었다.