• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제26권2호
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• pp.127-133
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• 2023

Purpose: Dyssynergic defecation (DSD) is one of the important causes of chronic constipation in children. We aimed to analyze the clinical features, diagnostic test results, and treatments for DSD in children. Methods: Children diagnosed with DSD using fluoroscopic defecography were enrolled in this study. Clinical data, including the results of colon transit time (CTT) test and biofeedback (BF) therapy, were collected from medical records retrospectively. Results: Nineteen children were enrolled. The median age was 9 years (6-18 years), the median frequency of bowel movement was 1/7 days (1-10 days), the median duration of constipation was 7.0 years (2-18 years), the median age of onset of constipation was 2.5 years (1-11 years). In the CTT test, outlet obstruction type was noted in 10/18 (55.6%), slow transit type in 5/18 (27.8%), and normal transit in 1/18 (5.6%). The median CTT was 52 hours (40-142 hours). Initial medical therapy was performed with the polyethylene glycol 4000, and the response was good in 9/19 (47.4%), fair in 9/19 (47.4%), and poor in 1/19 (5.0%). BF was performed in 8/19, with good results in 6/8 (75.0%) children and failure in 2/8 (25.0%) children. After long-term medical therapy (11/19), 3/5 showed good response with medication alone, 6/8 showed good response with BF and medication combined. Conclusion: DSD should be considered as a cause of chronic constipation in children, especially in those with abnormal CTT test results. BF combined with medical therapy is effective even with age-limited cooperation.

• 방송공학회논문지
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• 제12권3호
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• pp.203-213
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• 2007

지상파 DMB(Digital Multimedia Broadcasting)에서 비디오 서비스에 이어, 본격적인 데이터 서비스가 시작되고 있는데, 교통여행정보 서비스는 그 중에서도 핵심적인 데이터 서비스로 간주되고 있다. 본 논문은 교통여행정보 서비스를 제공하기 위한 방송시스템의 설계와 구현방안을 제안하기 위한 것이며, 전체 시스템은 저작 시스템, DB 시스템, 송출 시스템 및 모니터링 시스템으로 구성되어 있다. 구현한 시스템은 국내 지상파 DMB 교통여행정보 서비스 표준인 TPEG(Transfer Protocol Expert Group) 프레임을 따른다. 본 시스템은 실시간 혼잡교통정보(CTT), 혼잡교통정보(CTT SUM)를 비롯하여 다양한 비실시간 관심지점정보(POI), 안전운전정보(SDI) 등을 저작 및 자동 송출할 수 있도록 설계하였으며, 양질의 콘텐츠를 효율적으로 제작하고 제작한 콘텐츠를 비디오 및 오디오와 함께 안정적으로 송출하는데 중점을 두어 구현하였다. 구현한 시스템은 다양한 수신기와의 실내외 정합실험을 통하여 그 성능을 검증하였으며, 지속적인 업그레이드를 거쳐 현재 방송 서비스에 활용하고 있다.

• Journal of Korean Biological Nursing Science
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• 제20권1호
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• pp.11-19
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• 2018

Purpose: The purposes of this study were to perform items analysis using the classical test theory (CTT) and the item response theory (IRT), and to establish the validity and reliability of the Korean version of pressure ulcer prevention knowledge. Methods: The 26-item pressure ulcer prevention knowledge instrument was translated into Korean, and the item analysis of the 22 items having an adequate content validity index (CVI), was conducted. A total of 240 registered nurses in 2 university hospitals completed the questionnaire. Each item was analyzed applying CTT and IRT according to 2-parameter logistic model. Response alternatives quality, item difficulty and item discrimination were evaluated. For testing validity and reliability, Pearson correlation coefficient and Kuder Richardson-20 (KR-20) were used. Results: Scale CVI was .90 (Item-CVI range= .75-1.00). The total correct answer rate for this study population was relatively low as 52.5%. The quality of response alternatives was found to be relatively good (range= .02-.83). The item difficulty of the questions ranged form .10 to .86 according to CTT and -12.19 to 29.92 according to the IRT. This instrument had 12-low, 2-medium and 8-high item difficulty applying IRT. The values for the item discrimination ranged .04-.57 applying CTT and .00-1.47 applying IRT. And overall internal consistency (KR-20) was .62 and stability (test-retest) was .82. Conclusion: The instrument had relatively weak construct validity, item discrimination according to the IRT. Therefore, the cautious usage of a Korean version of this instrument would be recommended for discrimination because there are so many attractive response alternatives and low internal consistency.

• 천문학회지
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• 제38권2호
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• pp.241-244
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• 2005

We have analysed near-infrared JHKL observations of the members of the $\approx$9 Myr-old $\eta$ Chamaeleontis cluster. Using (J - H)/(K - L) and (H - K)/(K - L) IR colour-colour diagrams for the brightest 15 members of the cluster, we find the fraction of stellar systems with near-IR excess emission was 0.60 $\pm$ 0.13 (2$\sigma$). For the CTT and WTT star population, we also find a strong correlation between the IR excess and Ha emission which is also known as an accretion indicator. The (K - L) excess of these stars appears to indicate a wide range of star-disk activity; from a CTT star with high levels of accretion, to CTT - WTT transitional objects with evidence for some on-going accretion, and WTT stars with weak or absent IR excesses. Among the brightest 15 members, four stars (RECX 5, 9, 11 and ECHA J0843.3-7905) with IR excesses ${\Delta}$(K - L) > 0.4 mag and strong or variable optical emission were identified as likely experiencing on-going mass accretion from their circumstellar disks which we confirmed their accretion disks from the optical high-resolution echelle spectroscopic study. The result-ing accretion fraction of 0.27 $\pm$ 0.13 (2$\sigma$) suggests that the accretion phase, in addition to the disks themselves, can endure for at least ${\~}$10 Myr.

• Journal of Information Processing Systems
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• 제7권1호
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• pp.17-28
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• 2011

Despite the fact that the deployment of sensor networks and target tracking could both be managed by taking full advantage of Voronoi diagrams, very little few have been made in this regard. In this paper, we designed an optimized barrier coverage and an energy-efficient clustering algorithm for forming Vonoroi-based Wireless Sensor Networks(WSN) in which we proposed a mobile target tracking scheme (CTT&MAV) that takes full advantage of Voronoi-diagram boundary to improve detectability. Simulations verified that CTT&MAV outperforms random walk, random waypoint, random direction and Gauss-Markov in terms of both the average hop distance that the mobile target moved before being detected and lower sensor death rate. Moreover, we demonstrate that our results are robust as realistic sensing models and also validate our observations through extensive simulations.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제23권1호
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• pp.26-34
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• 2020

Purpose: To compare the clinical features, diagnostic findings, and medications of children with infrequent bowel movements or fecal soiling. Methods: This study enrolled 333 children (189 male; age range, 1 month to 18 years) diagnosed with functional constipation by Rome III or IV criteria. We classified them into 3 groups (infrequent bowel movement without fecal soiling [G3-a], infrequent bowel movement with fecal soiling [G3-b], and fecal soiling only [G3-c]) and into 2 subgroups of fecal soiling (G2-b) or not (G2-a). Retrospective data on clinical characteristics, colon transit time (CTT) test results, and medications were collected. The Wilcoxon rank-sum test, Kruskal-Wallis test, Chi-square test, and Fisher's exact test were used for the statistical analysis. Results: The median age (months) and interquartile range (IQR) was 33 (45) in G3-a, 54 (40) in G3-b, and 73 (48) in G3-c (p<0.0001). G3-c had the latest onset (median, 18; IQR, 18; p=0.0219) and longest symptom duration (24 [24], p=0.0148). PEG 4000 was used in 60.6% (G3-a), 96.8% (G3-b), and 83.2% (G3-c) of patients (p<0.0001). The median age (months) and IQR were 33.0 (45.0) in G2-a and 63.5 (52.5) in G2-b (p<0.0001). G2-b had later onset (median, 12; IQR, 19.5; p=0.0062) and longer symptom duration than G2-a (24 [12], p=0.0070). PEG 4000 was used in 60.6% (G2-a) and 88.3% (G2-b) of children (p<0.0001). No statistically significant intergroup differences were seen in maintenance laxative dose, CTT, or CTT type. Conclusion: Infrequent bowel movement and fecal soiling represent the advanced stage of chronic functional constipation.

• Structural Engineering and Mechanics
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• 제60권6호
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• pp.939-952
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• 2016

A compression to tensile load transforming (CTT) device was developed to determine indirect tensile strength of concrete material. Before CTT test, Particle flow code was used for the determination of the standard dimension of physical samples. Four numerical models with different dimensions were made and were subjected to tensile loading. The geometry of the model with ideal failure pattern was selected for physical sample preparation. A concrete slab with dimensions of $15{\times}19{\times}6cm$ and a hole at its center was prepared and subjected to tensile loading using this special loading device. The ratio of hole diameter to sample width was 0.5. The samples were made from a mixture of water, fine sand and cement with a ratio of 1-0.5-1, respectively. A 30-ton hydraulic jack with a load cell applied compressive loading to CTT with the compressive pressure rate of 0.02 MPa per second. The compressive loading was converted to tensile stress on the sample because of the overall test design. A numerical modeling was also done to analyze the effect of the hole diameter on stress concentrations of the hole side along its horizontal axis to provide a suitable criterion for determining the real tensile strength of concrete. Concurrent with indirect tensile test, the Brazilian test was performed to compare the results from two methods and also to perform numerical calibration. The numerical modeling shows that the models have tensile failure in the sides of the hole along the horizontal axis before any failure under shear loading. Also the stress concentration at the edge of the hole was 1.4 times more than the applied stress registered by the machine. Experimental Results showed that, the indirect tensile strength was clearly lower than the Brazilian test strength.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제8권2호
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• pp.130-136
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• 2005

목 적: Bristol 대변형태척도는 대장통과시간을 예측하는 간단한 방법이나 임상적으로 또는 연구목적으로 널리 사용되지 않고 있다. 이에 저자들은 소화기 증상으로 내원한 환아의 대변표현형, Bristol 대변형태척도와 대장통과시간검사 결과를 비교 분석하여 이들 상호간의 연관성 및 Bristol 대변형 태척도의 임상적 유용성을 알아보고자 하였다. 방 법: 2002년 5월부터 2004년 5월까지 소화기 증상으로 연세의대 세브란스 병원 소아과에 내원한 489명의 환아를 대상으로 연령, 성별, 대변의 표현형, Bristol 대변형태를 기술하고, 방사선 불투과성 표지자(Sitzmark$^R$ 또는 Kolomark$^{TM}$) 24개 또는 20개를 연속적으로 3일간 복용시킨 후 4일째 복부 방사선 사진을 촬영하여 대장통과시간을 측정하여 비교 분석하였다. 결 과: 내원한 환아의 평균 연령은 $8.2{\pm}3.9$세로 5세 이하 116명, 5세 초과부터 10세 이하 202명, 10세 초과 171명이었다. 대변표현형은 묽은 변 65명(13.3%), 정상 변 221명(45.2%), 굳은 변 188명(38.4%), 묽은 변과 굳은 변이 교대하는 환아가 15명(3.1%)이었고, Bristol 대변형태는 type 1이 57명(11.7%), type 2가 66명(13.5%), type 3이 203명(41.5%), type 4가 108명(22.1%), type 5가 36명(7.4%), type 6이 18명(3.7%), type 7이 1명(0.2%)이었다. 환아의 평균대장통과시간은 $35.9{\pm}19.5$시간이었다. 연령군과 평균 대장통과시간은 상관관계(p=4)가 없었다. 환아의 대변표현형, Bristol 대변형태, 대장통과시간은 통계학적으로 유의한 상관관계(p<0.001)를 보였으며, 환아가 진술한 대변표현형과 Bristol 형태는 유의한 상관관계(p<0.01)를 가지고 있었으나, 일치율은 묽은 변 29%, 정상 변 37%, 굳은 변 87%로 대변표현형이 굳은 변으로 감에 따라 높았고, 묽은 변으로 갈수록 일치율은 현저히 낮았다. 결 론: 대장통과시간 검사를 시행하지 못하는 환아에 있어서 Bristol 대변형태척도를 이용하여 대장통과시간을 예측하는 것이 임상 진료에 도움이 될 것으로 생각된다.

• 한국융합학회논문지
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• 제10권3호
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• pp.373-382
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• 2019

본 연구는 일개 대학교 간호학과 3개 학년 5개 전공교과목에 기억력과 실용능력 증진을 위한 창의적 교수법 일부를 적용하여 비판적 사고성향, 문제해결능력, 셀프리더십에 대한 영향 여부를 조사하고자 실시되었다. 자료수집은 2017년 8월 1일부터 12월 31일까지 수행되었으며 창의적교수법 적용 전후 설문조사를 시행하였다. 적용 결과 학년별로 1개 교과목에 다양한 교수법을 적용한 1학년의 경우에는 비판적 사고성향, 문제해결과정, 셀프리더십에 차이가 없었으나, 2개 교과목에서 유사한 교수법을 반복하여 적용한 2학년과 3학년의 경우 비판적 사고성향은 6.8점(p<0.001), 문제해결과정은 7.5~7.9점(p<0.001), 셀프리더십은 2.9~3.3점(p<0.001) 향상되었다. 학생들의 핵심역량을 향상시키기 위해 하나의 교과목에 여러 가지 교수법을 적용하는 것보다 1~2가지 방법을 여러 교과목에 반복적으로 적용하는 것이 보다 효과적임이 확인되었다. 창의적 교수법은 적성과 흥미에 따라 전공을 선택한 그룹에서 보다 효과적이었으므로 추후 전공에 대한 흥미를 촉진 시킬 수 있는 다양한 교수학습 전략을 개발할 필요가 있다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2007년도 학술발표회 논문집
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• pp.393-394
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• 2007

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