• The Journal of Advanced Prosthodontics
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• v.6 no.2
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• pp.88-95
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• 2014

PURPOSE. The purpose of this study is to evaluate if pre-treatment with desensitizers have a negative effect on microtensile bond strength before cementing a restoration using recently introduced self-adhesive resin cement to dentin. MATERIALS AND METHODS. Thirty-five human molars' occlusal surfaces were ground to expose dentin; and were randomly grouped as (n=5); 1) Gluma-(Glutaraldehyde/HEMA) 2) Aqua-Prep F-(Fluoride), 3) Bisblock-(Oxalate), 4) Cervitec Plus-(Clorhexidine), 5) Smart protect-(Triclosan), 6) Nd:YAG laser, 7) No treatment (control). After applying the selected agent, RelyX U200 self-adhesive resin cement was used to bond composite resin blocks to dentin. All groups were subjected to thermocycling for 1000 cycles between $5-55^{\circ}C$. Each bonded specimen was sectioned to microbars ($6mm{\times}1mm{\times}1mm$) (n=20). Specimens were submitted to microtensile bond strength test at a crosshead speed of 0.5 mm/min. Kolmogorov-Smirnov, Levene's test, Kruskal-Wallis One-way Analysis of Variance, and Conover's nonparametric statistical analysis were used (P<.05). RESULTS. Gluma, Smart Protect and Nd:YAG laser treatments showed comparable microtensile bond strengths compared with the control group (P>.05). The microtensile bond strengths of Aqua-Prep F, and Cervitec Plus were similar to each other but significantly lower than the control group (P<.05). Bisblock showed the lowest microtensile bond strength among all groups (P<.001). Most groups showed adhesive failure. CONCLUSION. Within the limitation of this study, it is not recommended to use Aqua-prep F, Cervitec Plus and Bisblock on dentin when used with a self-adhesive resin cement due to the decrease they cause in bond strength. Beside, pre-treatment of dentin with Gluma, Smart protect, and Nd:YAG laser do not have a negative effect.

• Speech Sciences
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• v.10 no.3
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• pp.29-36
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• 2003

The purposes of this study was to conduct a correlational analysis among $F_^{0}$, Jitter, Shimmer, and NHR (HNR), and NNE estimated by three speech analysis softwares, MDVP, Praat and Dr. Speech. Thirty females and 15 males with normal voice participated in the study. We used Sound Forge 6.0 to record their voice. MDVP, Praat and Dr. Speech were used to measure the acoustic parameters. The Pearson correlation coefficient was determined through a statistical analysis. The results came out as follows: Firstly, there was a strong correlation between $F_^{0}$ and Shimmer of both instruments. However, there was no correlation between Jitter of both instruments. Secondly, Shimmer showed a stronger correlation with HNR, NHR, and NNE than Jitter. Therefore, Shimmer was considered to be more useful and sensitive parameter to identify dysphonic voice compared to jitter.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05a
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• pp.261-264
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• 2003

본 연구는 바이그램을 이용하여 자동문서범주화 성능을 향상시키는 알고리즘의 개발을 목표로 한다. 기존의 문서 범주화 알고리즘의 장단점을 비교하여 개선된 바이그램 추출 알고리즘을 구현하고, 이 알고리즘을 실험한 결과 Reuters-21579 data set은 개별 단어를 사용하여 시험한 결과보다 단어+바이그램을 사용하였을 경우 BEP은 2.07%, F1은 1.40% 향상률을 보였고, Korea-web data set은 BEP의 8.12%, F1의 6.25% 향상을 보였다. 이와 같은 실험결과는 단어를 사용한 경우보다 단어+바이그램을 사용한 자동문서 범주화 시스템이 더 효율적이라는 것을 보여준다.

• The Journal of Korea Robotics Society
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• v.14 no.3
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• pp.228-235
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• 2019

This paper presents a multiple DoFs (degrees-of-freedom) prosthetic forearm and sEMG (surface electromyogram) pattern recognition and motion intent classification of forearm amputee. The developed prosthetic forearm has 9 DoFs hand and single-DoF wrist, and the socket is designed considering wearability. In addition, the pattern recognition based on sEMG is proposed for prosthetic control. Several experiments were conducted to substantiate the performance of the prosthetic forearm. First, the developed prosthetic forearm could perform various motions required for activity of daily living of forearm amputee. It was able to control according to shape and size of the object. Additionally, the amputee was able to perform 'tying up shoe' using the prosthetic forearm. Secondly, pattern recognition and classification experiments using the sEMG signals were performed to find out whether it could classify the motions according to the user's intents. For this purpose, sEMG signals were applied to the multilayer perceptron (MLP) for training and testing. As a result, overall classification accuracy arrived at 99.6% for all participants, and all the postures showed more than 97% accuracy.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.6
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• pp.1154-1162
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• 2016

This paper proposes a fast-transient digital LDO(Low dropout) regulator with binary-weighted current control technique. Conventional digital LDO takes a long time to stabilize the output voltage, because it controls the amount of current step by step, thus ringing problem is generated. Binary-weighted current control technique rapidly stabilizes output voltage by removing the ringing problem. When output voltage reliably reaches the target voltage, It added the FRZ mode(Freeze) to stop the operation of digital LDO. The proposed fast response digital LDO is used with a slow response DC-DC converter in the system which rapidly changes output voltage. The proposed digital controller circuit area was reduced by 56% compared to conventional bidirectional shift register, and the ripple voltage was reduced by 87%. A chip was implemented with a $0.18{\mu}F$ CMOS process. The settling time is $3.1{\mu}F$ and the voltage ripple is 6.2mV when $1{\mu}F$ output capacitor is used.

• Journal of Information Display
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• v.11 no.1
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• pp.8-11
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• 2010

In this study, a new thin films passivation technique using Zn with high electronegativity and $MgF_2$, a fluorine material with better optical transmittance than the sealing film materials that have thus far been reported was proposed. Targets with various ratios of $MgF_2$ to Zn (5:5, 4:6 and 3:7) were fabricated to control the amount of Zn in the passivation films. The Mg-Zn-F films were deposited onto the substrates and Zn was located in the gap between the lattices of $MgF_2$ without chemical metathesis in the Mg-Zn-F films. The thickness and optical transmittance of the deposited passivation films were approximately 200 nm and 80%, respectively. It was confirmed via electron dispersive spectroscopy (EDS) analysis that the Zn content of the film that was sputtered using a 4:6 ratio target was 9.84 wt%. The Zn contents of the films made from the 5:5 and 3:7 ratio targets were 2.07 and 5.01 wt%, respectively. The water vapor transmission rate (WVTR) was determined to be $38^{\circ}C$, RH 90-100%. The WVTR of the Mg-Zn-F film that was deposited with a 4:6 ratio target nearly reached the limit of the equipment, $1\times10^{-3}\;gm^2{\cdot}day$. As the Zn portion increased, the packing density also increased, and it was found that the passivation films effectively prevented the permeation by either oxygen or water vapor. To measure the characteristics of gas barrier, the film was applied to the emitting device to evaluate their lifetime. The lifetime of the applied device with passivation was increased to 25 times that of the PLED device, which was non-passivated.

• The Journal of the Korea Contents Association
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• v.14 no.12
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• pp.808-817
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• 2014

Purpose: This study was to investigate the recognition of skin infection (RSI) and management practice (MP) on caregivers in geriatric hospital. Methods: The subjects were 209 caregivers who work at geriatric hospital in G city and J do. Data were analyzed with ${\chi}^2$-test, t-test. and ANOVA using SPSS 18.0 program. Results: Prevalence rate of caregivers' skin diseases was 76.6%. Diagnosis of Skin disease was contact dermatitis 42.5%, scabies 26.9%, and skin xerosis 25.0%. The Mean RSI score was 3.81 and MP was 4.12. In addition, MP was significantly different by number of bed hospitals (F=4.63, p=.011) and number of caring patients (F=2.67, p=.049). Conclusion: This study will be a useful on continuing education for caregivers and basis for the guidance of medical infection control standards development.

• Korean Journal of Plant Taxonomy
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• v.45 no.4
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• pp.318-322
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• 2015

A new species, Fimbristylis jindoensis J. Kim & M. Kim, is herein named and described. It is found on wet lowland mountain slopes in Jindo-gun, Jeollanam-do, Korea. Fimbristylis jindoensis shares several characteristics (long-creeping rhizomes, oblong spikelets, brown scales, and three-sided achenes) with the related species F. pierotii Miq. It is, however, distinct from F. pierotii, which has terete culms with five to six furrows that are 9-48 cm tall, flowers in June to July, a dry grassland habitat, fewer than ten spikelets, and simple anthela inflorescences. In contrast, the new species has shallow furrowed oval culms which are 57-93 cm tall, flowers in July to August, a wet mountain habitat, more than twenty spikelets, and compound anthela inflorescences.

• Journal of the Korean Society of School Health
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• v.13 no.2
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• pp.319-329
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• 2000

This study suggestes that the improvement of oral care through on investigation of the effects of oral care on children by parents. This investigation was done on Sep. 29 1999 through Oct. 8 examining 376 of elementary, 1grade, 2grade, 3grade students in Kyunggi-Do. The content of the questions was analzed with a t-test and a one-way ANOVA; the relation to the oral care on children by parents with oral care behavior was analyzed by a Pearson's Correlation Coefficient. The results are as follow; 1) Statistically women were higher(F=-2.675, p<0.01). The average of the oral care of children was 2.34, man averaged 2.29, woman are raged 2.32. Statistically women were also higher(F=4.682, p<0.052). 2) The more educatior the mother had higher, the higher the grade. Statistically there was a difference(F=6.756, p<0.01. The oral care of children above Uni graduate(M=2.38), high (M=2:23), middle graduate(M=2.Z3). Statistically, the higher the academic degree, the more optimistic(F=4.114, p<0.05). 3) In the oral care on children by parents, when the conversation with the family was often 2.17, there was little difference(F=7.343, p<0.01). In the oral care of children was 2.45, there was little difference(F=7.343. p<0.01). As a result, the conversation with family affects the behavior. 4) In the oral care of children, if the food that they like was fruits, vegetables, and fresh food, the average was 2.37, very high. There was little difference in other cases(F=-3.179, p<0.05). We can conclude that fresh food affects the oral care of children. 5) In the oral care on children by parents, when the course of knowledge on the oral care was viewed by a grandfather(M=2.02), grandmother(M=2.05), father(M=2.14), mother(M=2.08). There was little difference(F=2.666, p<0.05). 6) In oral care, if the level of income was viewed high level(M=2.42), middle(M=2.34), 10w(M=1.88), there was a little difference(F=3.300, p<0.05). 7) The relation of the oral care on children by parents and the oral care was normal. In other words, the more management by parents, the more management by children.(p<0.01) Therefore in this study, the oral care on children by parents effect the oral care behavior of children. To improve the mouth health of children, the parents's interest in their children must be constant. Also, it is needed to develope an education program where parents and children can be educated.

• The Journal of Korean Physical Therapy
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• v.21 no.3
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• pp.109-117
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• 2009

Purpose: We investigated the relationship between professional self-concept and the job satisfaction of physical therapists. Methods: The subjects of the study were 221 physical therapists who worked in medical institutions in Seoul city and Kyounggi do. A questionnaire developed by Arthur and adapted by Sohng and Noh was used for measuring the professional self-concept. A questionnaire developed by Kim and Son and adapted by Kim and Jeon was used for measuring the job satisfaction. Results: The levels of the professional self-concept of physical therapists was a mean of 3.51 points and the level of job satisfaction was a mean of 3.32. There was a statistically significant difference for the professional self-concept of physical therapists according to such general characteristics as age (F=6.38, p<0.05), career (F=4.56, p<0.05) and pay (F=15.94, p<0.05), and there was a significant difference of job satisfaction according to such general characteristics as age (F=15.94, p<0.05), career (F=13.65, p<0.05) and pay (F=12.96, p<0.05). (ED note: this sentence made no sense. What I wrote is guesswork. You have to work on it.) The relationship between professional self-concept and job satisfaction showed a positive correlation (r=0.65, p<0.05). Conclusion: These findings show that modifications to the current program may improve the professional self-concept and job satisfaction of physical therapists.