• 한국수정란이식학회지
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• 제22권4호
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• pp.229-234
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• 2007

This study was undertaken to determine the normal appearance of the postpartum uterine involution. Postpartum changes in uterine shape, architecture, echogenicity and diameter were monitored with ultrasonography in 8 Miniature Schnauzer dogs. Vaginal discharge was observed visually during the 3 weeks of postpartum. A large amount of viscous dark green discharge changed progressively to a small amount of transparent discharge. In the uterine shape, the transverse images were crescent or polygonal at the beginning, but became circular after 16 days. At postpartum day 24, the longitudinal images of placental and interplacental sites were similar to each other The echogenicity of uterine structure was clearly distinguishable among the hyperechoic serous membrane, hypochoic myometrium, hyperechoic endometrium, and anechoic uterine contents during the first week postpartum, but afterward the interluminal boundaries and echogenicity became obscure gradually. In addition, the anechoic substance of the endometrial cavity was not observed after postpartum day 28. In the uterine diameter, the diameter of placental sites decreased markedly from 24 mm at the first day postpartum to 13 mm at day 7, and the diameter of interplacental sites decreased from 15 mm at postpartum day 1 to 10 mm at day 7. At postpartum day 65, the uterus (6.4 mm) changed little and had a uniform homogenous echo, and thus it was confirmed that uterine involution was completed at that time in Miniature Schnauzer dogs.

• 한국강구조학회 논문집
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• 제10권1호통권34호
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• pp.1-10
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• 1998

교량의 신설 또는 보수를 위한 작업차량의 진출입로나 기존 통행차량의 우회를 목적으로 한시적으로 사용되는 가교량은 일반적으로 상부구조로 H-Beam, 하부구조로 H-Pile을 사용하여, 이들 각 부재를 고장력볼트로 연결한 강구조 형식을 채택하고 있다. 그러나 이러한 교량은 상부구조에 신축이음부를 두지 않고 있어 일일기온차에 의해 발생하는 온도응력이 전체 구조거동에 미치는 영향이 클 것으로 예상된다. 따라서, 본 연구에서는 상부구조인 H-Beam에 온도와 변형률의 상시계측을 위한 모니터링 시스템을 도입하여 측정된 온도 및 변형률 데이터로부터 발생온도와 온도응력의 관계를 조사하였으며, 구조해석을 통한 이론치와의 비교를 실시하여 각 부재에서 발생하는 온도응력이 전체 구조거동에 미치는 영향을 평가하였다. 그 결과, 본 구조물에서 발생하는 응력의 변화는 부재의 온도변화에 의한 온도응력이 주원인인 것으로 나타났으며, 하부구조인 H-Pile의 충분한 교축방향 변위로 인하여 상부구조인 H-Beam의 온도변형 구속은 이루어지지 않는 것으로 나타났다. 한편, 상부구조인 H-Beam간의 연결 강성이 충분하지 않아 전체 구조계보다는 부분 구조계에 대한 해석으로부터 얻어진 변형량이 측정 온도 및 응력으로부터 계산된 변형량과 잘 일치하는 것으로 나타났다.

• Clinical and Experimental Pediatrics
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• 제64권5호
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• pp.229-238
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• 2021

Background: Bronchial hyperresponsiveness (BHR), an important physiological feature of asthma, is a prognostic marker of childhood asthma. Purpose: We aimed to investigate the factors associated with BHR in adolescents with childhood asthma. Methods: Two hundred and fifteen adolescents (≥13 years of age; 149 males, 66 females) who were diagnosed with asthma during childhood were enrolled, underwent methacholine challenge tests, and were divided into the BHR group (<25 mg/mL of provocation concentration causing a 20% fall in forced expiratory volume in 1 second [FEV₁] [PC₂₀], n=113) or non-BHR group (≥25 mg/mL of PC₂₀, n=102). We examined longitudinal changes in BHR and the risk factors for its persistence in the 108 adolescents for whom baseline data, including methacholine PC₂₀ at age 6 years, were available. Multivariate logistic regression analyses were performed to assess the factors associated with BHR in adolescents. Results: Mold sensitization (adjusted odds ratio [aOR], 5.569; P=0.005) and increased blood eosinophil count (aOR, 1.002; P=0.026) were independently associated with BHR in boys but not girls. The odds of BHR decreased by 32% with each 1-year increase in age in boys (aOR, 0.683; P=0.010) but not girls. A reduced FEV₁/forced vital capacity ratio (<90%) was independently related with BHR in female patients only (aOR, 7.500; P=0.007). BHR decreased with age throughout childhood. A low methacholine PC₂₀ at age 6 years was independently associated with persistent BHR throughout childhood in male and female patients, whereas early mold sensitization was a risk factor for persistent BHR in male patients only (aOR, 7.718; P=0.028). Conclusion: Our study revealed sex-specific differences in the factors associated with BHR in adolescents with childhood asthma. Our findings suggest the risk factors that might affect asthma transition from childhood to adolescence and adulthood.

• 대한조선학회논문집
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• 제58권1호
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• pp.17-23
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• 2021

The membrane-type Liquefied Natural Gas (LNG) cargo tank is equipped with a double barrier to seal the LNG, of which the secondary barrier serves to prevent LNG leakage and mainly uses fiber-reinforced composite materials. However, the composite materials have thermal expansion anisotropy, which deteriorates shape distortion and mechanical performance due to repeated thermal loads caused by temperature changes between cryogenic and ambient during the unloading of LNG. Therefore, in this study, the longitudinal thermal expansion characteristics of the composite materials were obtained using a vertical thermo-mechanical analyzer, and the elastic modulus was obtained through the tensile test for each temperature to perform thermal load analysis for each direction. This is considered that it is useful to secure reliability from the viewpoint of the design of materials for a LNG cargo hold.

• International Neurourology Journal
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• 제22권4호
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• pp.287-294
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• 2018

Purpose: Augmentation cystoplasty (AC) is a surgical procedure used in adults and children with refractory bladder dysfunction, including a small bladder capacity and inadequate bladder compliance, and in whom conservative and medical treatment has failed. This study was aimed to determine the long-term outcomes of AC in children. Methods: A retrospective analysis was conducted of 42 patients (31 males; mean age, $14.2{\pm}6.2years$) who underwent AC for neurogenic and nonneurogenic bladder dysfunction, with a median $12.0{\pm}1.5years$ of follow-up. All patients underwent AC using the ileum with or without continent reconstruction. Pre-AC, concurrent, and post-AC procedures and complications were analyzed. Patients who underwent ureterocystoplasty, were lost to follow-up, or had less than 10 years of follow-up were excluded. The primary outcomes were the complication and continence rates, the post-AC linear rate of height and weight gain, and renal function. The Student t-test was used to evaluate between-group differences and the paired t-test was used to evaluate longitudinal changes in measured variables. Results: Renal function was stable or improved in 32 of 42 patients (76.2%), with a post-AC continence rate of 88.1%. Thirty patients (71.4%) required 72 procedures post-AC. There was no statistically significant difference in the mean percentile of height (P=0. 212) or weight (P=0.142) of patients in the pre- and post-AC periods. No cases of bladder perforation or malignancy were detected. Conclusions: We consider AC to be a safe and effective procedure that does not negatively affect future physical growth, while achieving a good rate of stable renal function. Patients need long-term follow-up to address long-term complications.

• 디지털융복합연구
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• 제17권6호
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• pp.133-144
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• 2019

본 연구의 목적은 신기술 투자가 ICT 법 제도와 정부조직 조직성과에 어떠한 영향력을 보이는지 실증연구를 하는 것이다. 연구에서는 정부조직의 ICT 투자 관심, 역량, 융합, 프로세스 변화의 영향력을 살펴보고, 정책 방향성을 제시하고자 한다. 본 연구 방법은 구조방정식을 사용하였다. 분석결과, ICT 투자 관심과 운영 역량은 ICT 법 제도에 부정적 영향을 보였고, ICT 프로세스 역할 변경과 신기술 융합은 ICT 법 제도에 긍정적 영향을 보였다. 그리고 국가정보화 기본법은 조직성과에 긍정적 영향을 보였지만, 전자정부법은 부정적 영향을 보였다. 본 연구의 시사점은 조직 연구를 경영정보 관점으로 넓혔으며, 정책적 관점에서 정부조직별로 ICT 공동 추진과 법 제도의 중첩에 따른 상호 갈등 부분의 해소가 요구된다. 향후 연구는 이전부터 현재 정권까지의 ICT 역량에 대한 종단 연구가 필요하겠다.

• 대한한방내과학회지
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• 제40권2호
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• pp.254-261
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• 2019

Internuclear Ophthalmoplegia (INO) is characterized by lesion side eye's adduction limitation in lateral horizontal gaze and nystagmus in the abducting eye due to lesions in the Medial Longitudinal Fasciculus (MLF). Brainstem infarction is one of the causes of INO, but related issues have seldom been reported in the Korean medical literature. The present case was a pontine infarction patient with INO who complained of diplopia and eye movement disorder. The patient was treated with Korean medicine treatment, including herbal medicine, acupuncture, cupping, and moxibustion for 30 days. Her changes in clinical symptoms were measured with a Numeric Rating Scale (NRS) and a length of External Ocular Movement (EOM), in which the patient's right eyeball moved to the left from the midline in the left gaze. After treatment, her clinical symptoms were improved. Diplopia decreased from NRS 10 to NRS 2, and eye movement disorder was improved such that EOM increased from 1mm to 5 mm. Therefore, integrative Korean medicine treatment may be effective in the treatment of INO patients caused by pontine infarction.

• 한국전문물리치료학회지
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• 제26권2호
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• pp.1-7
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• 2019

Background: In previous studies, changes in postural alignment were found when the slope was changed during walking. Downhill walking straightens the trunk by shifting the line of gravity backward. Objects: This study investigated the effect of the downhill treadmill walking exercise (DTWE) on thoracic angle and thoracic erector spinae (TES) activation in subjects with thoracic kyphosis. Methods: A total of 20 subjects with thoracic kyphosis were recruited for this study. All the subjects performed the DTWE for 30 minutes. A surface EMG and 3D motion capture system were used to measure TES activation and thoracic angle before and after the DTWE. Paired t-tests were used to confirm the effect of the DTWE (p<.05). Results: Both the thoracic angle and TES activation had significantly increased after the DTWE compared to the baseline (p<.05). An increase in the thoracic angle indicates a decrease in kyphosis. Conclusion: The DTWE is effective for thoracic kyphosis patients as it decreases their kyphotic posture and increases the TES activation. Future longitudinal studies are required to investigate the long-term effects of the DTWE.

• Journal of Periodontal and Implant Science
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• 제49권2호
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• pp.60-75
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• 2019

The primary aim of this systematic review was to assess the evidence on periodontal disease progression after treatment in patients receiving supportive periodontal therapy (SPT) and to identify predictors of clinical attachment level (CAL) loss. A protocol was developed to answer the following focused question: In adult patients treated for periodontitis, what is the disease progression in terms of CAL loss after surgical or non-surgical treatment? Randomized controlled clinical trials, prospective cohort studies, and longitudinal observational human studies with a minimum of 5 years of follow-up after surgical or non-surgical treatment that reported CAL and probing depth changes were selected. Seventeen publications reporting data from 14 investigations were included. Data from 964 patients with a follow-up range of 5-15 years was evaluated. When the CAL at the latest follow-up was compared to the CAL after active periodontal therapy, 10 of the included studies reported an overall mean CAL loss of ${\leq}0.5mm$, 3 studies reported a mean CAL loss of 0.5-1 mm, and 4 studies reported a mean CAL loss of >1 mm. Based on 7 publications, the percentage of sites showing a CAL loss of ${\geq}2mm$ varied from 3% to 20%, and a high percentage of sites with CAL loss was associated with poor oral hygiene, smoking, and poor compliance with SPT. The outcomes after periodontal therapy remained stable over time. Disease progression occurred in a reduced number of sites and patients, mostly associated with poor oral hygiene, poor compliance with SPT, and smoking.

• 한국ITS학회 논문지
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• 제20권4호
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• pp.13-27
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• 2021

본 연구에서는 영동고속도로 용인IC~양지IC구간을 대상으로 2020년 데이터를 활용하여 자율주행자동차의 시장점유율 변화가 교통류에 미치는 영향을 추정하였다. 교통류에 미치는 영향 정도를 추정하기 위해 미시교통시뮬레이션 모형인 VISSIM을 활용하였다. 자율주행자동차의 종방향 제어를 반영하기 위해서 intelligent driver model(IDM)을 구축 후 VISSIM에 적용하여 일반차와 비교를 수행하고 주행행태를 검증하였다. 자율주행자동차의 시장점유율에 따른 이동성 및 안전성 분석 결과, 자율주행자동차 도입 시 시장점유율이 높아질수록 네트워크의 이동성은 향상되지만, 안전성의 경우 차종이 혼재되었을 때 교통류가 불안정해지므로 더욱 안전 관리에 집중해야 한다는 것을 확인하였다.