• 대한음성학회지:말소리
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• 제53호
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• pp.103-118
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• 2005

The performance of speech recognition system is degraded by mismatch between training and test environments. Recently, Stereo-based Piecewise LInear Compensation for Environments (SPLICE) was introduced to overcome environmental mismatch using stereo data. In this paper, we propose several methods to improve the conventional SPLICE and evaluate them in the Aurora2 task. We generalize SPLICE to compensate for covariance matrix as well as mean vector in the feature space, and thereby yielding the error rate reduction of 48.93%. We also employ the weighted sum of correction vectors using posterior probabilities of all Gaussians, and the error rate reduction of 48.62% is achieved. With the combination of the above two methods, the error rate is reduced by 49.61% from the Aurora2 baseline system.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 가을 학술논문 발표대회
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• pp.105-106
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• 2022

Now, the world is increasingly anxious about fine dust due to abnormal temperatures caused by global warming and increased yellow dust caused by desertification, and the World Health Organization (WHO) pointed out that more than 99% of the world's population is exposed to fine dust. In this situation, the reduction rate of fine dust and carbon dioxide of the matrix was tested by using expanded graphite, an eco-friendly and porous material, to improve air quality. As a result of the test, since expanded graphite is a material that expands between layers compared to conventional graphite, the reduction rate of fine dust and carbon dioxide decreases as the replacement rate of expanded graphite increases.

• 한국동물위생학회지
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• 제16권1호
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• pp.34-40
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• 1993

The present study was conducted to investigate the isolation frequency, biochemical prop erties and antimicrobial susceptibility of B. bronchiseptica isolated from slaughtered pigs during the period from March to December, 1992. In Kyeonggi province. A serological survey for antibody of B. bronchiseptica in 200 slaughtered pigs was carried out by agglutination and tetrazolium reduction methods. The results were summarized as follows ; 1. From 80 slaughtered pigs, 27(33.8%) case were isolated and all isolate strains were resistant to Penicillin, Streptomycin, Chloramphenicol, Tetracycline and Ampicllin, while the majority of them were susceptible to Gentamicin, Cloxacin, Colistin, Neomycin, and Kanamycin. 2. Incidence of B. bronchiseptica antibody in 200 slaughtered pigs were measured by agglutination and tetrazolium reduction methods. Agglutination method was shown 38 (19%) of 200 with a titer of below 1：20 and 20(10%) of 200 with a titer of above 1：640. Tetrazolium reduction method was observed 33(16.5%) of 200 with a titer of below 1 : 20 and 32(15%) of 200 with a titer of above 1：640. 3. LSD analysis indicated that the difference of the responses between agglutination test and tetrazolium reduction test was not significant.

• 상하수도학회지
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• 제21권6호
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• pp.679-687
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• 2007

Nanoscale zero valent ion (nZVI) technology is emerging as an innovative method to treat contaminated groundwater. The activity of nZVI is very high due to their high specific surface area, and supporting this material can help to preserve its chemical nature by inhibiting oxidation. In this study, nZVI particles were attached to granular ion-exchange resin through borohydride reduction of ferrous ions, and chemical reduction of nitrate by this material was investigated as a potential technology to remove nitrate from groundwater. The pore structure and physical characteristics were measured and the change by the adsorption of nZVI was discussed. Batch tests were conducted to characterize the activity of the supported nZVI and the results indicated that the degradation of nitrate appeared to be a pseudo first-order reaction with the observed reaction rate constant of $0.425h^{-1}$ without pH control. The reduction process continued but at a much lower rate with a rate constant of $0.044h^{-1}$, which is likely limited by mass transfer. To assess the effects of other ions commonly found in groundwater, the same experiments were conducted in simulated groundwater with the same level of nitrate. In simulated groundwater, the rate constant was $0.078h^{-1}$ and it also reduced to $0.0021h^{-1}$ in later phase. The major limitation in application of ZVI for nitrate reduction is ammonium production. By using a support material with ion exchange capacity, the problem of ammonium release can be solved. The ammonium was not detected in the batch test, even when other competitive ions such as calcium and potassium existed.

• 한국컴퓨터정보학회논문지
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• 제22권1호
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• pp.63-69
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• 2017

In this paper, we propose a method to optimize the geometry and installation position of the mixer in the selective catalytic reduction (SCR) system by computational fluid dynamic(CFD). Using the commercial CFD software of CFD-ACE+, the flow dynamics of the flue gas was numerically analyzed for improving the injection uniformity of the reduction agent. Numerical analysis of the mixed gas heat flow into the upstream side of the primary SCR catalyst layer was performed when the denitrification facility was operated. The characteristics such as the flow rate, temperature, pressure loss and ammonia concentration of the mixed gas consisting of the flue gas and the ammonia reducing gas were examined at the upstream of the catalyst layer of SCR. The temperature difference on the surface of the catalyst layer is very small compared to the flow rate of the exhaust gas, and the temperature difference caused by the reducing gas hardly occurs because the flow rate of the reducing gas is very small. When the mixed gas is introduced into the SCR reactor, there is a slight tendency toward one wall. When the gas passes through the catalyst layer having a large pressure loss, the flow angle of the exhaust gas changes because the direction of the exhaust gas changes toward a smaller flow. Based on the uniformity of the flow rate of the mixed gas calculated at the SCR, it is judged that the position of the test port reflected in the design is proper.

• Asian-Australasian Journal of Animal Sciences
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• 제21권4호
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• pp.494-498
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• 2008

MTT (3-(4, 5-dimethyl thiazol-2-yl)-2, 5-diphenyl tetrazolium bromide) reduction assay is a method that validates the viability of an active cell. Dehydrogenase in mitochondria converts yellow colored insoluble tetrazolium salt to purple colored water-soluble formazan. Sperm also have mitochondria in the midpiece, therefore sperm viability could be evaluated by MTT reduction assay. Several studies have already demonstrated the capability of application of the MTT reduction assay to sperm of several species in Hepes-BSA buffer. Because most liquid semen was diluted in extender like BTS (Beltsville Thawing Solution), Modena or Androhep when it is used or transferred, semen needed another dilution in Hepes-BSA buffer to assess sperm viability. In this study, we evaluated boar sperm viability especially in BTS extended semen and compared the efficiency of this test with eosin-nigrosin staining. We used the fresh BTS extended semen from a local A.I center. Semen sample was diluted to $3.0{\times}10^7$ sperms/ml in BTS. The rates of formazan production were measured in 96-well microtiter plates immediately and 1h after incubation at $17^{\circ}C$ using a spectrophotometer at wave length 560 nm. Simultaneously, split samples of the same semen were tested, using eosin-nigrosin staining to compare the efficiency of the MTT assay of sperm viability in BTS. The correlation between the results of these tests was calculated using Student-t test and ANOVA. The results revealed a strong correlation between the results of MTT reduction rate and the results that were simultaneously determined by eosin-nigrosin staining at 1 h. In conclusion, the MTT reduction test was an effective and simple method to validate sperm viability and it could be used as a simple tool to evaluate sperm viability in the local A.I center and laboratory.

• 한국식품영양학회지
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• 제29권5호
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• pp.818-827
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• 2016

This study was conducted to develop and validate the Sugar Intake Reduction Test (SIRT) for young children, and included eating behaviors, attitude, and nutritional knowledge about sugars. A draft version of the SIRT was developed after literature review. The final draft of the SIRT was established after two pilot tests of 5 year old children and an expert group's review, and is comprised of a one on one test between an investigator and a child using picture tools. It contained of 20 questions which included 3 components: eating behaviors (5 items), preference for sugar sweetened food (10 items), and nutritional knowledge about sugars (5 items). The final SIRT was conducted on 181 children 5 (n=100) to 6 (n=81) years old, to examine its item and test adequacies. The passing rate of most items significantly increased with increasing age, and most of the item discrimination also differed significantly between the below and upper score groups. The content validity was given a high score by professionals (mean score 3.9 out of 4). Reliability of all the items in the SIRT was high (Cronbach's ${\alpha}=0.82$). Moreover, the total component and the sub-component scores of the SIRT correlated significantly. Our results indicate that the SIRT is a valid tool to measure sugar intake reduction in young children aged 5~6 years.

• 한국자동차공학회논문집
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• 제10권6호
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• pp.59-64
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• 2002

The effects of EGR on emissions were investigated by using a six-cylinder, 8 litre, turbo-charged, heavy-duty diesel engine with a low pressure route EGR system. The experiments were performed at various engine loads while the EGR rates were set from 0% to 30%. Hot and cooled EGR are achieved without cooling and with cooling respectively. To verify the possibility of EGR technology for the applications, test were performed with steady state test cycle. It was found that the exhaust emissions with the EGR system resulted in a very large reduction in oxides of nitrogen at the expense of higher smoke and PM emissions. Increasing the EGR rate leads to deteriorating specific fuel consumption and power at lower speed and higher load. Also, the reduction rates of NOx emissions for hot and cooled EGR are similar.

• Journal of Acupuncture Research
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• 제23권1호
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• pp.25-38
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• 2006

Objectives : Acupuncture has been widely used in oriental medicine. The aim of this research is to study how does the interaction between reinforcement-reduction by twirling nine and six and subject's cold or heat tendency effect on Heart Rate Variability. Methods : We divided our subjects into 3 groups at random and classified subjects by their cold or heat tendency using questionnaire for cold-heat patternization. Group 1 is acupuncture at shinmun(HT7) reinforcement group, 2 is acupuncture at shinmun(HT7) reduction group, 3 in acupuncture at hapkok(LI4) group. According to their group, we acupunctured. Before and after acupuncture Heart Rate Variability raw data were measured during 5 minutes. LF, HF, LF norm HF norm were calculated. We analyzed these data using 3-way repeated ANOVA, Paired student T-Test. Results : 3-way repeated ANOVA showed significant interaction among LF, each group and subject's cold heat tendency(p<0.05). Paired student T-Test showed significant differences between before and after acupuncture at shinmun(HT7) reinforcement method in cold tendency men and acupuncture at shinmun(HT7) reduction method in heat tendency men(p<0.05). Conclusion : These results suggest that acupuncture at Shinmun(HT7) has an effect on declining sympathetic nerve function and has an effect on stabilizing mind through Interaction between reinforcement-reduction by twirling nine and six and subject's cold or heat tendency. We propose that more prudent care is needed about subject's cold or heat tendency and acupuncture technique of reinforcement-reduction to achieve the most suitable treatment effect.

• Tribology and Lubricants
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• 제36권3호
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• pp.117-123
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• 2020

In this study, the effect of the pre-mild wear mode test condition on the subsequent severe wear behavior of carbon steel has been investigated when the wear mode is varied according to the sliding speed change during sliding contact. Two sliding speeds of 0.3 m/s and 3 m/s for the mild wear mode test have been chosen and a sliding speed of 1 m/s for the severe wear mode test. A mild wear mode test at two different sliding speeds has been carried out during the severe wear mode test and total sliding distance of the mild wear mode test has been changed at this time. As a result, it could be found that the wear rate of carbon steel under the severe wear mode test after performing a pre-mild wear mode test is significantly reduced, compared with that before performing. However, its wear rate was slightly higher than that under the mild wear mode test. Oxides produced during the pre-mild wear mode test have been found to play a significant role in reducing the wear rate under the subsequent severe wear mode test. In particular, it was found that the effect of a pre-mild wear mode test performed at the sliding speed of 3 m/s has more rapid and the reduction in the wear rate was greater than thst at the sliding speed of 0.3 m/s.