• 센서학회지
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• 제21권6호
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• pp.395-401
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• 2012

The bond strength of three types of $TiO_2$ coatings onto fluorine-doped $SnO_2$ (FTO) glass was investigated with the aid of a tape test according to ASTM D 3359-95. Transmittance was then measured using an UV-vis spectrophotometer in the wavelength range of 300 nm to 800 nm to evaluate the extent of adhesion of $TiO_2$ nanorods/nanoparticles on FTO glass. A sharp interface between the coating layer and the substrate was observed for single $TiO_2$ coating ($TiO_2$ nanorods/FTO glass), which may be detrimental to the bonding strength. In multicoating sample ($TiO_2$ nanorod/$TiO_2$ nanoparticle/$TiO_2$ nanoparticle/FTO glass), the tape test was not performed due to severe peeling-off prior to the test. On the other hand, the dual coating sample ($TiO_2$ nanorod/$TiO_2$ nanoparticle/FTO glass) showed minimum variation of transmittance (4%) after the test, suggesting that the topcoat adheres well with the FTO substrate due to the presence of the $TiO_2$ nanoparticle buffer layer. The use of a $TiO_2$ nanorod electrode layer with good adhesion may be attributed to the excellent dye sensitized solar cell performance.

• Journal of Biosystems Engineering
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• 제17권3호
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• pp.213-222
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• 1992

To develop the wireless remote opreating system of walking rice transplanter, this study was carried out for manufacturing the wireless remote control system acting upon the transplanter. The first report of this study contained about the construction and operating method of a developed remote control system for 2-row walking type transplanter. It is the second report about the field test for an experimental transplanter being attached a wireless control system and for a conventional transplanter. The test was executed to investigate the characteristics of velocity, rectilinearity, turning time, interval of roots and of rows, and field capacity in accordance with various engine speeds for an experimental transplanter. The measurements of this test were compared with those of the conventional transplanter. The obtained results were as follows : 1. The operating velocity of the experimental transplanter was faster than the conventional one when the high speed range of the engine but the variances were very large. 2. The rectilinearity, interval of raws and of roots, and the turning time of the experimental transplanter was inferior to the conventional one at some speed ranges of the engine. 3. Field capacity of the experimental transplanter was superior to the conventional one at high speed of the engine. 4. There were some disadvantages for the experimental transplanter to operate, because it was constructed without any aid devices, such as float and hydraulic system for instance. But if the remote control system of this study equip at the modern walking transplanter, it will be improved and utilized without defects which was revealed from this test.

• 동의생리병리학회지
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• 제29권6호
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• pp.498-502
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• 2015

Yukmijihwang-tang (YM) is a well-known prescription to treat kidney inflammation on Korea. However, the effects of YM on maximal exercise performance (MEP) is not-well investigated. In this study, we aimed to evaluate the effects of YM on MEP using forced swimming test (FST) model. Mice were largely divided into three group; a non-swimming group, saline treated-swimming load test group, and YM treated-swimming load group. Swimming load test groups were re-divided into swimming control group (Control), YM fed group (YM). YM was administrated orally for 2 weeks before FST. After FST, immobility time, oxygen consumption was measured by physiological test, and serum was collected for biochemical analysis. FST induced MEP identified by increased immobility, oxygen consumption, and biochemical factors. Immobility time was significantly reduced by YM treatment compared with control group. Oxygen consumption was also significantly reduced by YM treatment. The increase on lactic acid and lactate dehydrogenase after FST was inhibited by YM　treatment. In addition, consumption of energy source (free fatty acid, and triglyceride) and recovery of energy was enhanced by YM treatment after FST. In conclusion, YM inhibited the elevation of immobility time, oxygen consumption, and biochemical factors after FST. YM could be used as a beneficial agents to enhance maximal endurance exercise performance and an effective ergogenic aid in exercise training.

• 농촌의학ㆍ지역보건
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• 제44권4호
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• pp.195-208
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• 2019

의료급여수급권자는 낮은 본인부담으로 인해 공급자에 의한 유발의료수요가 발생하거나 수급권자의 도덕적 해이가 발생하여, 의료서비스 남용으로 인한 의료급여 재정의 건전성을 저해한다는 지적을 받고 있다. 이 연구는 관상동맥중재술과 같은 질병부담이 높은 의료서비스 이용에 있어서 우리나라의 대표적인 의료보장형태인 건강보험환자와 의료급여환자의 진료비 발생 구조를 분석하여 진료비 관리의 정책적 방향을 제시하고자 수행되었다. 관상동맥중재술 시행을 받은 환자에서 의료보장형태에 따라 의료서비스 이용 양상 및 진료비 구조에 차이가 있었다. 의료급여군이 건강보험군에 비해 재원일수가 길고, 응급실을 경유하여 입원한 환자의 비율이 높았으며, 비급여진료비, 선택진료비, 일당 비급여진료비가 적게 발생하였고, 재원일수와 관련 있는 진찰료 및 입원료, 식대, 투약 및 주사료 항목에서는 총 진료비가 많이 발생하였다. 따라서, 국가차원의 효율적인 진료비 관리를 위해서 취약계층에 대한 예방과 교육서비스를 제공하여 사전적 진료비관리가 이루어져야 하며, 의료급여 환자의 재원일수 증가에 따른 급여진료비 발생을 관리하는 전략이 필요할 것으로 보인다. 또한, 비급여 진료비에 있어서 의료급여환자의 미충족 의료서비스가 발생하지 않도록 의료비 지원방안도 마련되어야 한다.

• 말소리와 음성과학
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• 제6권2호
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• pp.73-79
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• 2014

Alveolar fricative sounds /s/ and /s'/ are learned last for normal children in the speech development process for Koreans. These are especially difficult to articulate for hearing-impaired children often causing articulation errors. The acoustic phonetic evaluation uses testing tools to provide indirect and object information. These objective resources can be compared with standardized resources on speech when interpreting the results of a test. However, most previous studies in Korea did not consider acoustic studies that used the spectrum moment values of hearing-impaired children. Therefore, this study was conducted to compare the characteristics of hearing-impaired children's pronunciation of fricative sounds using spectrum moment values. For this purpose, the study selected a total of 10 hearing-impaired children (5 boys and 5 girls) currently in 3rd or 5th grade and attending one of the elementary schools in Seoul or Gyeonggi-do. For the selection process, their age, type of hearing aid, implantation of hearing aid (CI) before two years of age, hearing capacity (dB) before and after wearing the hearing aid, duration of speech rehabilitation, and time of learning alveolar fricative sounds were all considered. Also, 10 normal children (5 boys and 5 girls) were selected among 3rd or 5th grade students attending one of the elementary schools in Seoul or Gyeonggi-do. The subjects were asked to read the carrier sentence, "I say _______," including a list of 12 meaningless syllables composed of CV and VCV syllables, including alveolar fricative sounds /s/ and /s'/ and vowels /a/, /i/, and /u/. The recorded resources were processed through the Time-frequency Analysis Software Program to measure M1 (mean), M2 (variance), M3 (skewness), and M4 (kurtosis) of the fricative noise. No significant differences were found when comparing spectrum threshold values in the acoustic phonetic characteristics of hearing-impaired children and normal children in alveolar fricative sound pronunciation according to vowels /a/, /i/, and /u/, alveolar fricative sounds /s/ and /s'/, and syllable structure (CV, VCV) other than, for M3 in the comparison of groups according to disability. In the comparison of syllable structures, there were statistically significant differences in M1, M2, M3, and M4 with clinical significance. However, there was no significant difference in results when comparing the alveolar fricative sounds according to the vowels.

• 한국산학기술학회논문지
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• 제19권12호
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• pp.404-415
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• 2018

본 연구는 20-40대 HIV/AIDS의 지식 및 태도를 확인하고, 지식과 태도에 미치는 영향요인을 파악하기 위해 2011년, 2013년 지역사회건강조사 자료를 활용한 2차 자료 분석 연구이다. 연구대상자는 만 20세부터 만 49세로, 최종 분석 대상자는 182,315명이다. 수집된 자료는 t-test, ANOVA, 상관관계분석, 다중회귀분석으로 분석하였다. 연구 결과, HIV/AIDS의 지식은 정답률 69.4%로 높은 지식수준을 보이나, 개별 문항에서 감염경로에 대한 지식이 부족하며, 20대가 가장 낮은 정답율을 보였다. HIV/AIDS의 태도율은 44.3%로 부정적 태도수준을 나타났다. HIV/AIDS 지식 및 태도는 남성일수록, 미혼일수록, 소득이 높을수록 교육 수준이 높을수록, 직업이 농림어업, 주부/무직보다 관리자 및 전문가, 직업군인일수록 지식 및 태도의 점수가 높았다. 지식과 태도 사이에 양의 상관관계(r=0.27, p<.001)를 보였다. 에이즈 관련 지식 및 태도에 영향을 미치는 요인으로, 연령, 결혼상태, 소득수준, 직업, 교육수준이 있었으며 연령별로 차이가 있음을 확인하였다. 따라서, HIV/AIDS 지식수준 향상과 긍정적인 태도 구축을 위해서 일률적이고 획일적인 교육보다는 연령 및 특성별 맞춤형 교육프로그램이 필요하다.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2009년 춘계학술대회논문집
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• pp.176-182
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• 2009

In the present study, a numerical simulation for the diffusion of hydrogen jet in a enclosure was performed to aid the leakage test of the hydrogen for the safety of the hydrogen vehicle. The temporal and spatial distributions of the hydrogen concentration in the test chamber are predicted from the present numerical analyses. Flammable region of 4-74% and explosive region of 18-59% hydrogen by volume was identified from the present results. Factors influencing the diffusion of the hydrogen jet were examined to evaluate the effectiveness of forced ventilation for relieving the accumulation of the leaked hydrogen gas in the chamber, which include location of open windows, size of leakage nozzle, and leakage rate among others. The distribution of the concentration of the leaked hydrogen for various cases can be used as a database in various applications for the hydrogen safety.

• 한국보건간호학회지
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• 제30권2호
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• pp.206-220
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• 2016

Propose: This study was to identify the factors affecting the oral health status in vulnerable elders receiving home visiting health care service. Methods: A total of 444 elderly people over the age of 65 at 33 public health centers in Daegu and Gyungbuk areas were included in this survey. The data were collected by personal interview with nurses using oral health knowledge, behavior, and status questionnaires from the $10^{th}$ to $22^{nd}$ of July, 2012. The data were analyzed with t-test, one-way ANOVA, $Scheff{\acute{e}}$ test, and stepwise multiple regression, using SPSS program. Results: Factors affecting the oral health status were chewing satisfaction with denture 14.5% (${\beta}=.391$, p<.001), denture care (wash with water) 3.2% (${\beta}=-.187$, p<.01), and types of health insurance (medical aid type1, 2) 1% (${\beta}=-.111$, p<.05). The factors explained 18.7% of variance in the oral health status of vulnerable elderly subjects. Conclusion: The results of this study indicate that in order to improve the oral health status of vulnerable elders, it is necessary to provide oral health education that includes the proper usage of denture to elders who receive home-visiting care.

• 한국도로학회논문집
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• 제19권4호
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• pp.9-18
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• 2017

PURPOSES : This study evaluates the reasonableness of the recommended amount of deicing chemicals based on historical data for snow removal. The result can be used to aid decision-making for the reservation of cost-effective de-icing chemicals. METHODS : First, the recommended amount of de-icing chemical to use and historical usage data were evaluated to identify specific usage characteristics for each region. Road maintenance length and snow-removal working days were analyzed over the past five winter seasons. Next, differences in the recommended amount of chemical to use and actual use were compared using the Kolmogorov-Smirnov test. Last, the two types of data were analyzed using a chi-square test to verify if the two distributions of variation pattern are statistically significant. We found that there are significant differences between the data from each region during the past five winter seasons. RESULTS : The results showed that the equation for calculating the amount of de-icing chemical to use appears to be revised. CONCLUSIONS : The results imply that the equation for calculating the amount of de-icing chemical to apply as a national standard is very important when the public agency makes decisions related to snow-removal.

• 유통과학연구
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• 제11권2호
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• pp.5-10
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• 2013

Purpose - The current research examines the effect of life cycle stages on capital structure of listed companies in Tehran Stock Exchange. Research design, data, methodology - By aid of 685 year-company data, which collected from financial statements of companies during 2006-2012, first, the companies, are classified into three groups including companies in growth, maturity and decline stages. After removing the companies, which were not in accordance with life cycle model, 86 companies were selected to test two main hypotheses of the research. Results - The results show that the capital structure of the sample companies is different in various life cycle stages. More investigation by LSD test also revealed that the total debt to total assets ratio means of the companies in growth stages were significantly different from those companies in maturity stages and those in growth stages had high level of debt to assets ratio. Conclusions - The result showed the average amount of the working capital for companies in three stages are significantly different and due to high level of operation of the companies in maturity and decline stages, these companies held high amount of working capital than those in the growth stages.