• Pediatric Infection and Vaccine
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• 제30권2호
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• pp.55-61
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• 2023

목적: 소아에서 요로감염은 높은 질병부담을 갖는다. 본 연구의 목적은 합병증이 없고 균혈증이 없는 소아 요로감염에서 단기 항생제 요법이 기존의 표준치료 방법과 비교해 비열등한지 평가하고자 한다. 방법: PubMed, Embase 및 Cochrane 데이터베이스에서 2021년 4월까지 출간된 연구에 대한 신속 체계적 문헌고찰(Rapid Systematic Review)을 시행했다. 비교군으로는 소아 요로감염 환자를 대상으로 단기 항생제 치료(≤4일)를 한 군과 표준 항생제 치료(≥5-7일)를 한 군 간의 임상결과를 비교한 연구를 선정하였다. 결과: 신속 체계적 문헌고찰 결과, 단기 치료 방법은 표준 치료 방법에 비해 비열등한 치료 효과를 가지며, 임상 완치율 및 재발률이 유사한 것으로 측정되었다. 단기 치료와 표준 치료 방법의 임상적 치료율을 비교한 10개의 연구 모두 유사한 결과를 보고하였다. 신장 합병증을 평가를 한 연구는 단기 치료 방법이 표준 치료 방법과 비교해 비열등하지 않음을 보여주었다. 요로감염 재발에 대해서는 10개 중 8개의 연구에서 단기 치료와 표준 치료 방법 간 결과에 유의미한 차이가 없다고 보고하였다. 결론: 본 연구를 통해 결과는 균혈증이 없는 소아 요로감염 환자에서 단기 치료 방법이 표준 치료 방법에 준하는 효과성을 나타났었다. 본 연구결과를 바탕으로 일부 선택된 환자에 대한 치료 의사결정 시 참고할 수 있을 것이다.

• 한국산학기술학회논문지
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• 제17권6호
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• pp.676-686
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• 2016

본 연구는 국내 리츠가 운용된 2002년부터 2015년까지의 리츠사의 타인자본에 대한 차입이자율을 월별 자료로 구축하여 차입이자율의 흐름과 금리변수와의 관계를 분석하였다. 선행연구를 검토한 결과 리츠사의 차입이자율은 리츠 내부의 고유요인에 의해 결정되기도 하지만 거시경제변수 중 금리변수와 연계성이 높게 나타났다. 이에 본 연구는 K-REITs 차입이자율과 금리 변수 간에 ARDL(autoregressive distributed lag: 자기회귀시차) 모형을 설정하여 장기관계를 분석하였으며, ARDL-ECM 모형을 기반하여 단기 관계도 검토하였다. 실증분석 결과 K-REITs 차입이자율과 국고채 3년, 국고채 5년, 회사채(AA-,3년), 기업일반자금 대출금리에서 장기 공적분 관계가 형성되었으며, 이는 K-REITs 차입이자율이 장기금리 변수와 동조하고 있음을 보여준다. 또한, 기업일반자금 대출금리는 장기 관계와 단기 조정 과정에서도 K-REITs 차입이자율과의 연계성이 높게 나타났다. REITs가 금융권 차입에 관한 사항과 경영계획 수립 시에 기업일반자금 대출금리와 같은 장기금리 변수의 동향 등을 고려하여 의사결정 한다면 K-REITs 발전에 실질적인 도움이 될 수 있을 것이다.

• 한국콘텐츠학회논문지
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• 제6권4호
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• pp.136-145
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• 2006

본 연구는 Cr 투여가 태권도 선수들에게 발차기 횟수, 혈장요소 및 무산소성 파워에 어떠한 영향을 미치는지를 규명하기 위하여 수행되었다. 이를 위하여 남자 고등학교 태권도 선수를 대상으로 위약집단(n=9명), Cr 투여집단(n=9명)으로 구분하여 Cr을 투여한 결과 Cr 투여집단에서만 발차기 횟수, 혈장효소, 무산소성 파워(평균파워, 최대파워)에서 각각 유의하게 증가하였다. 이러한 결과들은 Cr 투여가 태권도 선수들에게 있어서 효과적인 영양 보조물 방법이고, 단기간의 Cr 투여로도 발차기 횟수의 향상에 긍정적인 영향을 미칠 수 있음을 확인할 수 있었다.

• 한국안전학회지
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• 제10권3호
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• pp.68-80
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• 1995

A series of parametric calculations have been performed in order to investigate the short-term and short-range plume and puff behavior of toxic gaseous and solid pollutant dispersion in an open atmosphere. The simulation is made by the use of the computer program developed by this laboratory, in which a control-volume based finite-difference method is used together with the SIMPLEC algorithm for the resolution of the pressure-velocity coupling appeared In Wavier-Stokes equation. The Reynolds stresses are solved by the standard two-equation k-$\varepsilon$ model modified for buoyancy together with the RNG(Renormalization Group) k-$\varepsilon$ model. The major parameters considered in this calculation are pollutant gas density and temperature, the relative velocity of pollutants to that of the surrounding atmospheric air, and particulate size and density together with the height released. The flow field is typically characterized by the formation of a strong recirculation region for the case of the low density gases such as $CH_4$ and air due to the strong buoyancy, while the flow is simply declining pattern toward the downstream ground for the case of heavy molecule like the $CH_2C1_2$and $CCl_4$, even for the high temperature, $200^{\circ}C$. The effect of gas temperature and velocity on the flow field together with the particle trajectory are presented and discussed in detail. In general, the results are physically acceptable and consistent.

• Journal of Oral Medicine and Pain
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• 제43권4호
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• pp.112-117
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• 2018

Purpose: The aim of this study is to compare the short-term effectiveness of hard and soft stabilizing appliances (H-A and S-A) in treating patients with acute temporomandibular joint (TMJ) disc displacement without reduction (DDwoR). Methods: Eighty one patients diagnosed as acute TMJ DDwoR at oral medicine of Chosun University Dental Hospital from November 2016 to September 2017 were included in this study. The subjects were divided into three groups: The control group (34 patients treated without occlusal appliance), the H-A group (31 patients treated with H-A) and the S-A group (16 patients treated with S-A). The pain intensity using Visual Analog Scale and maximum mouth opening (MMO) were evaluated every week for 8 weeks. Results: The improvement of the pain intensity and MMO in the H-A group and the S-A group compared with the control group were noted (p<0.05). Conclusions: This study suggests that hard and S-As may be equally useful in treating patients with TMJ DDwoR. S-A could be recommended to reduce the symptoms of TMJ DDwoR in short period.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1996년도 춘계공동학술대회논문집; 공군사관학교, 청주; 26-27 Apr. 1996
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• pp.514-517
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• 1996

In solving multi-level knapsack problems, conventional heuristic approaches often assume a short-sighted plan within a static decision enviornment to find a near optimal solution. These conventional approaches are inflexible, and lack the ability to adapt to different problem structures. This research approaches the problem from a totally different viewpoint, and a new method is designed and implemented. This method performs intelligent actions based on memories of historic data and learning. These actions are developed not only by observing the attributes of the optimal solution, the solution space, and its corresponding path to the optimal solution, but also by applying human intelligence, experience, and intuition with respect to the search strategies. The method intensifies, or diversifies the search process appropriately in time and space. In order to create a good neighborhood structure, this method uses two powerful choice rules that emphasize the impact of candidate variables on the current solution with respect to their profit contribution. A side effect of so-called "pseudo moves", similar to "aspirations", supports these choice rules during the evaluation process. For the purpose of visiting as many relevant points as possible, strategic oscillation between feasible and infeasible solutions around the boundary is applied for intensification. To avoid redundant moves, short-term (tabu-lists), intermediate-term (cycle detection), and long-term (recording frequency and significant solutions for diversification) memories are used. Test results show that among the 45 generated problems (these problems pose significant or insurmountable challenges to exact methods) the approach produces the optimal solutions in 39 cases.lutions in 39 cases.

• Advances in concrete construction
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• 제9권2호
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• pp.161-171
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• 2020

In this paper, an experimental study was conducted on the compressive behavior of steel tube confined concrete (STCC) and concrete-filled steel tube (CFST) columns with active and passive confinement. To create active confinement in the STCC and CFST specimens, an innovative method was used in this study, in which by applying pressure on the fresh concrete, the steel tube was laterally pretensioned and the concrete core was compressed simultaneously. Of the benefits of this technique are improving the composite column behavior, without the use of additives and without the need for vibration, and achieving high prestressing levels. To achieve lower and higher prestressing levels, short and long term pressures were applied to the specimens, respectively. Nineteen STCC and CFST specimens in three groups of passive, short-term active, and long-term active confinement were subjected to axial compression, and their mechanical properties including the compressive strength, modulus of elasticity and axial strain were evaluated. The results showed that the proposed method of prestressing the STCC columns led to a significant increase in the compressive strength (about 60%), initial modulus of elasticity (about 130%) as well as a significant reduction in the axial strain (about 45%). In the CFST columns, the prestressing led to a considerable increase in the compressive strength, a small effect on the initial and secant modulus of elasticity and an increase in the axial strain (about 55%). Moreover, increased prestressing levels negligibly affected the compressive strength of STCCs and CFSTs but slightly increased the elastic modulus of STCCs and significantly decreased that of CFSTs.

• 전산구조공학
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• 제2권2호
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• pp.62-72
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• 1989

본 연구는 확률에 기초한 한국의 기본 설계풍속 추정을 위한 합리적인 방법을 제시하고 위험도에 기초한 전국의 설계풍속지도를 제안한다. 본 논문에서는 장기기록 지역의 계절풍 연 최대 풍속자료와 단기기록 지역의 계절풍 월 최대 풍속자료의 극치 Type I 분포 모형에 대한 적합성을 검토하였고, 극치 태풍 풍속 분포 추정에서는 Monte-Carlo 시뮬레이션을 이용하여 간접적인 해석방법이 적용되었다. 태풍과 계절풍에 대한 기본 설계풍속은 두개 분포의 적(product)으로 된 혼합모형에서 구한다. 본 연구 결과로부터 제안된 모형과 방법은 현재 한국에서 가용한 단기기록 풍속자료를 이용한 위험도에 기초한 기본설계풍속과 기본 설계풍속지도의 개발에 실용적인 도구로 활용 가능하다고 본다.

• Journal of Information Processing Systems
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• 제17권4호
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• pp.818-833
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• 2021

To address the problems of low precision rate, insufficient feature extraction, and poor contextual ability in existing text sentiment analysis methods, a mixed model account of a CNN-BiLSTM-TE (convolutional neural network, bidirectional long short-term memory, and topic extraction) model was proposed. First, Chinese text data was converted into vectors through the method of transfer learning by Word2Vec. Second, local features were extracted by the CNN model. Then, contextual information was extracted by the BiLSTM neural network and the emotional tendency was obtained using softmax. Finally, topics were extracted by the term frequency-inverse document frequency and K-means. Compared with the CNN, BiLSTM, and gate recurrent unit (GRU) models, the CNN-BiLSTM-TE model's F1-score was higher than other models by 0.0147, 0.006, and 0.0052, respectively. Then compared with CNN-LSTM, LSTM-CNN, and BiLSTM-CNN models, the F1-score was higher by 0.0071, 0.0038, and 0.0049, respectively. Experimental results showed that the CNN-BiLSTM-TE model can effectively improve various indicators in application. Lastly, performed scalability verification through a takeaway dataset, which has great value in practical applications.

• 대한족부족관절학회지
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• 제25권1호
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• pp.17-24
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• 2021

Surgical treatments for chronic lateral ankle instability include anatomic repair, anatomic reconstruction using an auto or allograft, non-anatomic reconstruction, and arthroscopic repair. Open anatomic repair using the native ligament with or without reinforcement of the inferior extensor retinaculum is commonly performed in patients with sufficient ligament quality. Non-anatomical reconstruction using the adjacent peroneus brevis tendon is typically used only in patients with poor-quality ligament remnants or when previous repair failed. Anatomical reconstruction can be considered in patients in whom anatomical repair is expected to fail and when performed using auto or allografts can provide good to excellent short-term results, although the long-term outcomes of these methods remain unclear. Arthroscopic repair can provide good to excellent short-term clinical outcomes, but evidence supporting this technique is limited. The advantages and disadvantages of various surgical methods should be compared, and appropriate treatment should be implemented based on patient characteristics.