• 대한족부족관절학회지
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• 제23권1호
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• pp.6-11
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• 2019

As a result of the increased participation in recreational and competitive sports activity, the incidence of chronic lateral instability has risen. Because chronic ankle instability can cause significant comorbidity and increase the social cost, the interest in this issue is growing. Although there are well-documented and effective surgical treatments for managing this condition, conservative treatments are a viable first option in selected patients. Through conservative treatment, surgical treatments can be reduced or delayed without necessarily affecting the overall outcome, but the failure of conservative treatment results in the need for surgical treatment to reduce the long term complications. Appropriate postoperative rehabilitation is essential for adequate functional recovery, even when surgical treatment is required.

• 대한족부족관절학회지
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• 제10권1호
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• pp.60-65
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• 2006

Purpose: This study was performed to evaluate clinical and radiographical results of treatment of chronic lateral ankle instability with modified Brostrom procedure. Materials and Methods: This is a retrospective study of 22 cases in 22 patients treated with modified $Brostr{\ddot{o}}m$ procedure under the diagnosis of chronic lateral ankle instability from May 2000 to August 2004. Average age was 32.3 years. Average follow-up period was 23 months. Preoperative and postoperative radiographs of ankle anteroposterior view, lateral view and varus stress view were analyzed. The clinical evaluation was performed according to the Americal Orthopaedic Foot and Ankle Society scales. Results: After the modified $Brostr{\ddot{o}}m$ procedure, Americal Orthopaedic Foot and Ankle Society scales score was improved by average 28 points. Among the 22 cases, 13 cases were excellent, 3 cases good, 4 cases fair, and 2 cases poor with satisfaction of 73%. Five cases had intermittent ankle pain of whom 3 cases had difficulty during competitive sports activity. Lateral tilting of talus improved by average 5.4 degrees on varus stress view. Conclusions: The modified $Brostr{\ddot{o}}m$ procedure is one of the most effective methods for treating of chronic lateral ankle instability.

• 한국식물병리학회지
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• 제12권4호
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• pp.415-421
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• 1996

대전, 공주, 논산, 부여와 김해 등에서 병든 딸기, 토마토, 오이에서 총 992균주의 잿빛곰팡이병균을 분리하여 이들 균주로부터 dichlofluanid 저항성 5균주, 감수성 5균주를 임의로 선발하였다. 분리된 균의 dichlofluanid 저항성을 조사한 결과 105균주(10.6%)가 저항성이었다. 저항성균 균사의 최소 억제 농도(minimum inhibitory concentration)는 100~500$\mu\textrm{g}$/ml 이상이었으나 감수성균은 10 $\mu\textrm{g}$/ml 미만이었다. Dichlofluanid 저항성의 안정성 조사를 위하여 35$^{\circ}C$고온 처리 및 계대 배양할 때 조사된 저항성 5균주 중 3균주는 저항성이 감소하거나 상실되었다. 저온 저장 및 온실에 장기 보관할 때는 조사된 저항성 균주 모두가 저항성이 감소하거나 완전히 상실되는 것으로 나타났다. 이러한 결과는 이 약제에 대한 저항성이 불안정하다는 것을 나타낸다. 오이에 감수성균 및 저항성균을 혼합 접종한 후 재분리할 때 시간이 지날수록 감수성균이 더 많이 분리되어 저항성균의 경합 능력이 감수성 균주에 비하여 열등하였다.

• 농촌지도와개발
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• 제29권1호
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• pp.33-49
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• 2022

The competitive strategy perspective is one of the important approaches to develop ecotourism sites. It increases the residents' profits and overcomes the instability of the supply in the marketability. The study aims to explore the ecotourism successful factors based on competitiveness strategies. We found seven key success factors of the competitive strategy approach in the ecotourism industry as the guarantee of sustainable ecotourism as follows: infrastructure, operation management, product/technical development, human resources, service system and cultivation of tourists' understanding and behavior, marketing activities, and local resources. Conclusions and practical implications for successful factors of ecotourism are presented according to the result of the in-depth interview and focus group interview with ecotourism experts.

• Wind and Structures
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• 제28권4호
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• pp.255-270
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• 2019

Aerodynamic configurations of bridge decks have significant effects on the aerostatic torsional divergence and flutter forsuper long-span bridges, which are onset for selection of suitable bridge decksfor those bridges. Based on a cable-stayed bridge with double main spans of 1500 m, considering typical twin-box, stiffening truss and closed-box section, which are the most commonly used form of bridge decks and assumed that the rigidity of those section is completely equivalent, are utilized to investigate the effects of aerodynamic configurations of bridge decks on aerodynamic instability performance comprised of the aerostatic torsional divergence and flutter, by means of wind tunnel tests and numerical calculations, including three-dimensional (3D) multimode flutter analysis and nonlinear aerostatic analysis. Regarding the aerostatic torsional divergence, the results obtained in this study show twin-box section is the best, closed-box section the second-best, and the stiffening truss section the worst. Regarding the flutter, the flutter stability of the twin-box section is far better than that of the stiffening truss and closed-box section. Furthermore, wind-resistance design depends on the torsional divergence for the twin-box and stiffening truss section. However, there are obvious competitive relationships between the aerostatic torsional divergence and flutter for the closed-box section. Flutter occur before aerostatic instability at initial attack angle of $+3^{\circ}$ and $0^{\circ}$, while the aerostatic torsional divergence occur before flutter at initial attack angle of $-3^{\circ}$. The twin-box section is the best in terms of both aerostatic and flutter stability among those bridge decks. Then mechanisms of aerostatic torsional divergence are revealed by tracking the cable forces synchronous with deformation of the bridge decksin the instability process. It was also found that the onset wind velocities of these bridge decks are very similar at attack angle of $-3^{\circ}$. This indicatesthat a stable triangular structure made up of the cable planes, the tower, and the bridge deck greatly improves the aerostatic stability of the structure, while the aerodynamic effects associated with the aerodynamic configurations of the bridge decks have little effects on the aerostatic stability at initial attack angle of $-3^{\circ}$. In addition, instability patterns of the bridge depend on both the initial attack angles and aerodynamic configurations of the bridge decks. This study is helpful in determining bridge decksfor super long-span bridges in future.

• 디지털융복합연구
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• 제19권7호
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• pp.289-301
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• 2021

이 연구는 무용전공 중·고등학생의 완벽주의 성향이 경쟁불안 및 무용몰입에 미치는 영향을 규명하는데 목적이 있다. 연구대상은 무용전공 중·고등학생 279명을 유의표집방법으로 표집하였으며 조사도구는 설문지를 사용하였다. 자료분석은 t-test, 일원변량분석, 상관분석, 다중회귀분석을 실시하여 다음과 같은 결론이 도출되었다. 첫째, 완벽주의 성향과 경쟁불안에 유의한 차이가 나타났다. 둘째, 완벽주의 성향이 무용몰입에 유의한 차이가 나타났다. 셋째, 완벽주의 성향과 경쟁불안 및 무용몰입 간에는 인과관계가 있다. 무용전공 중·고등학생들의 무용몰입을 높이기 위해서는 다양한 심리적 요인들을 탐색함으로써 무용몰입을 높일 수 있는 요인을 파악하는 것이 중요함을 알 수 있다.

• Asia pacific journal of information systems
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• 제32권4호
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• pp.707-727
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• 2022

Industrial revolution 4.0 makes business competition more challenging and will impact the instability of the company's financial performance. Dynamic environmental conditions make it difficult for companies to make predictions in making decisions. Investing in information technology (IT) is one way for companies to maintain financial stability and competitive advantage in dynamic competition. Resource-Based Theory (RBT) explains that information technology (IT) is a resource that can create a competitive advantage for the company. This study aims to examine the moderating role of dynamic industrial environments and IT strategic emphasis on the relationship between a lag effect of IT investment and firm's financial performance volatility. Using the data of companies listed on the Indonesia Stock Exchange (IDX) for five years starting from 2013-2017, the method used to estimate the research model's parameters is the generalized method of moments (GMM) approach. The results show that the industrial environment and the emphasis on IT strategy have a role in moderating and strengthening the relationship between the time lag in IT investment in reducing the firm's financial performance volatility.

• 대한토목학회논문집
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• 제39권5호
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• pp.623-630
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• 2019

아시아 건설시장의 전략적 중요성이 높아지면서 기업 간 경쟁이 더욱 치열해지고 있다. 기존의 아시아 건설시장에 대한 연구는 주요 국가로의 진출전략 도출, 분야별 리스크 평가에 대한 정성적 접근이 주류를 이루었던 반면, 다수 기업의 역동적인 경쟁구도를 정량적으로 설명한 연구는 드물었다. 이에 본 연구는 국내 건설기업이 2009년부터 2017년까지 계약을 체결한 3,996건의 프로젝트 정보를 바탕으로 아시아 지역의 계약실적 구조를 분석하였다. 정태적 분석에는 시장 집중도, 동태적 분석에는 시장 이동성 및 불안정성 개념을 각각 활용하였으며, 이에 대한 수학적 모델을 소개하였다. 분석 결과, 정태적 측면에서는 아시아 건설시장에서 국내 상위 기업군의 시장 점유율 집중 현상이 나타나고 있으며, 동태적 측면에서는 산업설비 공종을 제외한 대부분의 경우 시장 지위가 약하고 안정성이 떨어지는 것으로 밝혀졌다. 본 연구에서 제시한 분석 방법론과 결과는 산업 차원의 실적에 대한 체계적 진단을 가능케 하며, 향후 경쟁전략 수립을 위한 기초자료를 제공하였다는 점에서 의의가 있다.

• Journal of the Korean Data and Information Science Society
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• 제25권4호
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• pp.951-959
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• 2014

Recently Hazelton and Turlach (2009) proposed a weighted kernel density estimator for the deconvolution problem. In the case of Gaussian kernels and measurement error, they argued that the weighted kernel density estimator is a competitive estimator over the classical deconvolution kernel estimator. In this paper we consider weighted kernel density estimators when sample observations are contaminated by double exponentially distributed errors. The performance of the weighted kernel density estimators is compared over the classical deconvolution kernel estimator and the kernel density estimator based on the support vector regression method by means of a simulation study. The weighted density estimator with the Gaussian kernel shows numerical instability in practical implementation of optimization function. However the weighted density estimates with the double exponential kernel has very similar patterns to the classical kernel density estimates in the simulations, but the shape is less satisfactory than the classical kernel density estimator with the Gaussian kernel.

• 한국건설관리학회논문집
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• 제20권1호
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• pp.124-132
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• 2019

해외건설업이 국가경제에 기여하는 중추 산업임에도 불구하고, 기존의 해외건설 실적에 관한 연구는 단편적인 동향이나 특정 시점의 시장 점유율을 분석하는데 집중해왔다. 해외건설업은 프로젝트 기반산업으로 분절적이고(fragmented), 여러 다른 업체로 구성되며(heterogeneous), 업황에 따라 시장 구조가 역동적으로 변화하는(dynamic) 특성을 가지고 있어 특정 시점에 대한 정태적 분석과 함께 동태적 시장 변화의 고려가 필수적이다. 본 연구에서는 2000년부터 2017년까지 국내 건설기업이 계약을 체결한 9,173건의 프로젝트 정보를 활용하여 우리나라 해외건설 계약실적 구조를 분석하였다. 산업 차원의 실적정보를 정태적(시장 집중도), 동태적(시장 이동성 및 불안정성)으로 구분하여 분석하였으며, 구체적인 방법론을 기술하였다. 분석 결과, 정태적 측면에서는 국내 건설기업의 해외건설 경쟁구도가 최근 더욱 치열해지고 있으며, 동태적 측면에서는 주요 지역 및 공종을 제외한 대부분의 경우 시장 지위가 미약하고 불안정한 것으로 밝혀졌다. 본 연구는 정태적 동태적 분석의 조합을 통해 건설 관련 주체들의 시장 이해도를 제고하고, 향후 경쟁전략 수립을 위한 기초자료를 제공하였다는 점에서 의의가 있다.