• 한국통신학회논문지
• /
• 제25권1A호
• /
• pp.10-17
• /
• 2000

본 논문에서는 가변 확산이득 (VSG) 구조를 갖는 멀티미디어 멀티레이트 DS/CDMA 시스템에서 PN 시퀀스의 위상에 따른 상관 특성을 보였고, 시퀀스 위상을 최적화 하였다. 멀티레이트 VSG-DS/CDMA 시스템의 경우에 시퀀스의 최적화는 동일 길이의 시퀀스들과는 물론, 다른 확산 이득을 갖는 다른 시퀀스들에 대해서 동시에 이루어져야 하므로 시퀀스의 최적화가 쉽지 않다. 따라서, 본 논문에서는 이러한 멀티레이트 시스템에서의 시퀀스 상관 특성을 살펴보았고, 이를 통해서 비트 오율을 최소화 시킬 수 있는 시퀀스 선택기준으로 MIN-AIP를 제시하였다. m 시퀀스와 Gold 시퀀스에 대한 성능분석 결과, MIN-AIP 기준에 의한 시퀀스 초기 위상의 선택기준이 성능을 가장 향상시킬 수 있는 최적의 선택기준이라는 결론을 얻을 수 있었다.

• 음성과학
• /
• 제10권4호
• /
• pp.189-200
• /
• 2003

The objective of this study was to examine two new parameters by which we could screen people with malignant vocal folds. The new parameters were the difference sums and Pearson correlation coefficients between adjacent pairs of intensity level matrices of narrow-band spectra. Audio files from the Korean Disordered Speech Database were analyzed by Praat, a speech analysis software, to obtain matrices of 400 intensity levels at 16 time points of each sustained vowel spectra. We limited our study to 12 normal subjects and 20 patients with malignant vocal folds who recorded at least three Korean vowels at a sound-proofed booth in Busan National University Hospital. Results indicated that the average coefficients of the abnormal subjects were much lower than those of the normal subjects while the average difference sums of the patients were much higher than those of the normal ones. Also, we found that the degree of the malignancy of the vocal folds was related to the coefficients and sums. However, some subjects at the initial stages of cancerous vocal folds yielded almost comparable coefficients and difference sums to those of the normal speakers. Further studies on larger databases will be desirable to set certain criteria or threshold levels for screening people with vocal fold diseases.

• 대한예방한의학회지
• /
• 제12권2호
• /
• pp.131-143
• /
• 2008

This study aims at finding out the correlation between sasang constitution diagnosis using QSCCII which is self reporting questionnaire and sasang constitution diagnosis using iridology. In this study, 131 adult male and female participated as testees. The survey on questionnaires of QSCCII were carried out and then photos of irises of the participants were taken. The data from QSCCII was computed in WIN QSCCII version and they were translated into sasang constitution. For iris photos, the iris specialized camera with 1,300,000 picture elements was used, and then the iris photos were also read by computer. The correlation rate between QSCCII sasang constitution and iris sasang constitution was 52.4%, where kappa coefficient shows 0.323, which gives meaningful result statistically. And thus, the result can be used as a reference in sasang constitution diagnosis. For iridology to be served as a tool for sasang constitution diagnosis, criteria need to be developed for more concrete iris sasang constitution diagnosis in the future. And also comparative research is required among sasang constitution professionals and its iridological correlation of Sasang constitution carried out on more various group of people.

• 말소리와 음성과학
• /
• 제12권4호
• /
• pp.19-25
• /
• 2020

This study examined thirty-one Korean students' pronunciation of an English passage using a speech recognition application, Speechnotes, and two Canadian raters' evaluations of their speech according to the International English Language Testing System (IELTS) band criteria to assess the possibility of using the application as a teaching aid for pronunciation education. The results showed that the grand average percentage of correctly recognized words was 77.7%. From the moderate recognition rate, the pronunciation level of the participants was construed as intermediate and higher. The recognition rate varied depending on the composition of the content words and the function words in each given sentence. Frequency counts of unrecognized words by group level and word type revealed the typical pronunciation problems of the participants, including fricatives and nasals. The IELTS bands chosen by the two native raters for the rainbow passage had a moderately high correlation with each other. A moderate correlation was reported between the number of correctly recognized content words and the raters' bands, while an almost a negligible correlation was found between the function words and the raters' bands. From these results, the author concludes that the speech recognition application could constitute a partial aid for diagnosing each individual's or the group's pronunciation problems, but further studies are still needed to match human raters.

• Imaging Science in Dentistry
• /
• 제53권2호
• /
• pp.91-99
• /
• 2023

Purpose: This systematic review aimed to investigate the correlation between chronological age and dental pulp volume in cone-beam computed tomography (CBCT). Materials and Methods: The literature was searched in 4 databases(PubMed, Scopus, Web of Science, and Google Scholar). Within each study, the outcome of interest was the correlation (r) between chronological age and pulp volume. A random-effect meta-analysis was conducted. Subgroup analysis was carried out according to sex and tooth type. Results: Of 5,693 identified studies, 27 fulfilled the inclusion criteria and were selected for meta-analysis. These articles focused on single-rooted teeth (n=21), multi-rooted teeth (n=6), maxillary teeth (n=14), mandibular teeth (n=6), and maxillary and mandibular teeth (n=12). The relationship between chronological age and dental pulp volume was examined in the entire population (r= -0.67), men (r= -0.75), and women (r= -0.77) in single- and multi-rooted teeth. The results of the total population analysis showed a relatively strong negative relationship between age and pulp volume. Conclusion: This study suggested that CBCT is a reliable and repeatable tool for dental age estimation. A strong inverse relationship was observed between pulp chamber volume and age. Further studies on the correlation between chronological age and pulp volume of multi-rooted teeth may be beneficial.

• Asian-Australasian Journal of Animal Sciences
• /
• 제11권2호
• /
• pp.117-120
• /
• 1998

Relationships of breeding values of sires for first lactation milk yield with pedigree information or indices were examined to identify the optimal criteria of selecting young dairy bulls for future use in artificial insemination (AI). Records of performance data on 1087 crossbred daughters (Holstein - Friesian, Jersey and Brown Swiss with Hariana) of 147 sires, generated at Livestock Production Research (Cattle and Buffaloes) Farm, IVRI, Izatnagar, U.P., during 1972 - 1995 were used to obtain the estimates of sire's breeding values (EBV) using the Best Linear Unbiased Prediction Procedures. The correlations between young bull's EBV and the dam's first lactation milk yield was non-significantly different from zero. However, the young bull's EBV was negatively and significantly related (r = - 0.275 ; P < 0.05) to the dam's best lactation milk yield, suggesting that the selection of young dairy bulls from high yielding elite dams is not a suitable criteria for genetic improvement. The correlations of sire's and paternal grandsire's EBV's with young bull's EBV were high and positive (0.532, 0.844; P < 0.01). The maternal grandsire's EBV was positively but non-significantly related to grandson's EBV. The pedigree index incorporating dam's milk records and sire's EBV's showed a negative and non-significant correlation with young bull's EBV. However, the correlation of a pedigree index $(I_3)$ combining information on sire's and paternal grand-sire's EBV's with young bull's EBV's was considerably high and positive (0.797; P < 0.01). The regression coefficients of young bull's EBV on pedigree index $I_3$, was higher than those on other pedigree information. These results revealed that there was no advantage in basing selection on dam's performance or maternal grand-sire's EBV and that sire's and paternal grandsire's EBV's were reliable pedigree information for selection of young dairy bulls for future use in AI.

• 대한임상검사과학회지
• /
• 제49권2호
• /
• pp.121-127
• /
• 2017

이 연구에서는 복부비만을 가진 고령여성을 대상으로 대사증후군 동반 유무에 따른 대사증후군 위험요인과 hs-CRP와의 관련성에 대해 알아보고자 하였다. 대사증후군 진단은 AHA/NHLBI (American Heart Association/National Heart, Lung and Blood Institute) 2005년 기준에 따라 5가지 기준 중 3개 이상 해당되는 경우 대사증후군 진단군(MetS, N=77), 2개이하의 위험요인에 해당하는 경우 대조군(Absent, N=97)으로 분류하였다. hs-CRP 농도는 대사증후군 위험요인과 밀접한 관련이 있으며, 특히 복부비만(r=0.190, p=0.014), 공복혈당(r=0.240, p=0.002), HDL-콜레스테롤(r=-0.164, p=0.035)과 연관이 있음을 확인할 수 있었다. 또한 대조군보다 대사증후군 진단군에서 hs-CRP가 높게 나타났으며(p=0.007), 복부비만 상태일지라도 높은 혈당(p=0.006)과 낮은 HDL-콜레스테롤혈증(p=0.010)의 위험요인이 있는군에서 hs-CRP가 높았다. 결론적으로 복부비만이 있더라도 대사증후군 위험요인의 동반 유무에 따라 염증관련 위험도가 달라짐을 알 수 있었다.

• Journal of Nutrition and Health
• /
• 제29권5호
• /
• pp.507-516
• /
• 1996

This study was undertaken to estimate seasonal variation of riboflavin status and investigate the relationship between riboflavin intake and its biochemical status in rural women. Dietary intake was measured by determining both 24hr recall method and conventient method. The riboflavin intake was also estimated by food frequency method. Ribofiavin biochemeical status was assessed by erythrocyte glutathione reductase activity coefficient(EGR AC) and urinary riboflavin excretion. All information was repeatly collected in three seasons ; farming season (June), harvest season(October), nonfarming season(February). Mean daily riboflavin intake was below RDA for Koreans in all seasons. Cereal & pulse, vegetable were the primary sources of riboflavin intake and provided above 60% of the total dietary riboflavin intake in all seasons. Riboflavin biochemical status was significantly different among seasons(EGR AC P<0.005, 24hr urinary riboflavin excretion P<0.05), and riboflavin biochemical deficiency was highest in February. The mean values of EGR AC revealed riboflavin deficiency in all seasons. However the mean values of urinary riboflavin excretion were within the normal range except 24hr urinary riboflavin excretion in February. On the basis of EGR AC criteria, 44.7% of subjects were at risk of deficiency in June, 44.7% in October, 81.6% in February. Result of individual riboflavin status assessed by EGR AC or 24hr urinary riboflavin excretion criteria was quite alike. Urinary riboflavin excretion per gram of creatinine underestimated riboflavin deficiency. Significant correlations were observed among biochemical indexes. It also appeared that riboflavin intake measured by food frequency method showed significant correlation with biochemical indexes, especially high correlation with EGR AC (P<0.001). The results indicated that the prevalence of riboflavin deficiency seems to be high among rural women in all seasons and the inadequacy of dietary riboflavin intake was reflected in the abnormalcy of riboflavin biochemical status assessed by EGR, AC. Therefore EGR AC seems to be more sensitive measure of impaired riboflavin status compared to urinary excretion.

• 한국환경보건학회지
• /
• 제30권5호
• /
• pp.378-387
• /
• 2004

This study was carried to investigate the emission characteristics of mercury from domestic and industrial MSW (municipal solid waste) incinerator stacks. The mercury concentration levels of flue gas from 32 MSW incinerators stacks selected were above the criteria level ($5{\mu}g/S\;m^3$). MSWI facilities exceeding the criteria levels in Korea are due to the poor units comparison of combustion chamber(CC)-cyclone(CY)-stack. So, the mercury from MSW incinerators stack were suspected to contaminate the natural system unless the MSW incinerators were properly controlled. Mean-while, the relationship between mercury concentration and temperature of flue gas in MSW incinerator stacks were examined at two temperature ranges (Group A : $29.85{\sim}327.63^{\circ}C$, Group B : $446.9{\sim}848.15^{\circ}C$). The mercury concentration in flue gas with high temperature range was higher than that of flue gas with low temperature rage. This mean that the temperature of flue gas plays an important role in mercury control in MSW incinerator. The emission characteristics oi mercury was also evaluated by using the correlation matrix between the mercury and NOx, $PM_{10}$, moisture (MO.) at both low temperature and high temperature flue gas ranges. The mercury concentration was mainly affected by NOx, $PM_{10}$. moisture (MO.) at low temperature range, while the mercury concentration at high temperature flue gas was mainly affected by NOx, moisture (MO.). From these results, it was suggested that the temperature of cooling system and the air pollution control device should be properly regulated in order to control mercury of flue gas in MSWI incinerator.

• 디자인학연구
• /
• 제20권
• /
• pp.51-58
• /
• 1997

다차원적이며 다속 성을 지니는 디자인 대상에 대하여 통합적으로 자료처리가 진행되고, 가시적인 운용이 더해짐으로서 디자인 과정은 보다 효율적이며, 효과적으로 처리되어 궁긍 적으로 시장경쟁을 가지게 되는 것이다. 본 연구에서는 디자인 제의(컨셉트)의 각 단계와 세부 디자인 완료 후 최종 디자인 결과의 평가를 C/S의 컴퓨팅 환경 아래, 효율적으로 접근시키는데 있으며, 특히 선행연구인 디자인 평가의 방법별 비교연구 결과를 바탕으로 컴퓨터 어플리케이션을 연구/개발하여 실제적인 디자인 평가의 실행기반을 조성하는데 연구의 기본 목적을 둔다. 평가 법 특성 정도에서 평가 법(Ⅹ)는 신속성, 평가 법(Y)는 신뢰성, 평가 법(Z)는 중요성을 두드러지게 보이고 있는 점 또한 이에 대한 주관적인 조사와도 대체로 일치되고 있다. 평가방법 별 상관관계 분석에서는 1차 연구에서 보다 강한 상관계수를 보여 영가 설(nullhypothesis)이 부정되고 연구가설(research hypothesis)이 채택되어 평가 법 간의 정적인 상관관계(positive relation)가 있다고 보여 진다.