• 한국전문물리치료학회지
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• 제26권4호
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• pp.70-76
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• 2019

Background: An excessive pronated foot is defined as a flattening or complete loss of the medial longitudinal arch. Excessive foot pronation is considered to have high risk factors of overuse injuries in the lower limb. Various treatments have been investigated in attempts to control excessive pronation. Objects: This meta-analysis identifies the effects of an anti-pronation taping technique using different materials. Methods: The electronic databases used include MEDLINE, the Physiotherapy Evidence Database (PEDro), Science Direct, the Korean Studies Information Service System (KISS), the Research Information Sharing Service (RISS), the Korea National Library, and the Korean Medical Database (studies published up to July 31, 2019). The database search used the following keywords: "foot drop" OR "foot arch" OR "foot pronation" OR "flat foot (pes planus)" AND "taping" OR "support." Eight eligible studies were analyzed to determine the effectiveness of anti-pronation taping in study and control groups. Results: The overall random effect size (Hedges'g) of the anti-pronation taping technique was 0.147 (95% confidence interval [CI]: -.214 to .509). When the effect (Hedges' g) was compared by the type of tape material, rigid tape (RT; Lowdye taping) was .213 (95% CI: -.278 to .704) and kinesiotape (KT; arch support taping) was -.014 (95% CI: -.270 to .242). Based on this meta-analysis, it was not possible to identify the extent to which anti-pronation taping was effective in preventing navicular drop, improving balance, or changing foot pressure. Only three of the eight eligible studies applied KT on excessive pronated feet, and the outcome measure areas were different to those of the RT studies. The KT studies used EMG data, overall foot posture index (FPI) scores, and rear foot FPI scores. In contrast, the RT studies measured navicular heights, various foot angles, and foot pressure. Conclusion: This review could not find any conclusive evidence about the effectiveness of any taping method for patients with pronated feet. Future studies are needed to develop the anti-pronation taping technique based on the clinical scientific evidence.

• Geomechanics and Engineering
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• 제19권2호
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• pp.153-165
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• 2019

A case study of monitoring and analysis of surface settlement induced by tunneling of Tabriz metro line 2 (TML2) is presented in this paper. The TML2 single tunnel has been excavated using earth pressure balanced TBM with a cutting-wheel diameter of 9.49 m since 2015. Presented measurements of surface settlements, were collected during the construction of western part of the project (between west depot and S02 station) where the tunnel was being excavated in sand and silt, below the water table and at an average axis depth of about 16 m. Settlement readings were back-analyzed using Gaussian formula, both in longitudinal and transversal directions, in order to estimate volume loss and settlement trough width factor. In addition to settlements, face support and tail grouting pressures were monitored, providing a comprehensive description of the EPB performance. Using the gap model, volume loss prediction was carried out. Also, COB empirical method for determination of the face pressure was employed in order to compare with field monitored data. Likewise, FE simulation was used in various sections employing the code Simulia ABAQUS, to investigate the efficiency of numerical modelling for the estimating of the tunneling induced-surface settlements under such a geotechnical condition. In this regard, the main aspects of a mechanized excavation were simulated. For the studied sections, numerical simulation is not capable of reproducing the high values of in-situ-measured surface settlements, applying Mohr-Coulomb constitutive law for soil. Based on results, for the mentioned case study, the range of estimated volume loss mostly varies from 0.2% to 0.7%, having an average value of 0.45%.

• 대한조선학회 특별논문집
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• 대한조선학회 2015년도 특별논문집
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• pp.50-55
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• 2015

Application of newly conceptualized Anti-Splash Devices designed for COT vent pipes were studied on a P/V valve located on the upper deck of an oil carrier vessel. Anti-Splash devices are used in the shipbuilding industry in order to avoid oil overflow and spray accidents caused by excess pressure and vacuum condition in the cargo oil tanks. These conditions are caused by the transverse and longitudinal sloshing forces that arise from ship motion during sea voyages. The main issue with existing Anti-Splash device model is flux at the outlet of the Anti-Splash Device, and so, new conceptual models for the Anti-Splash device were developed and compared to existing Anti-Splash device model using CFD analysis. Transient analysis was used to capture the flow and velocity of each model and a comparative analysis was performed between old and new-concept models. This data was used to determine the optimal design parameters in order to develop an optimized Anti-Splash Device. A Factory acceptance test was performed on the new-concept models in order to verify the performance and efficiency against their design requirements and other criterion. The final step performed was to apply the optimized Anti-Splash Device models for COT vent pipes to an actual vessel and verify performance through a seawater cargo operation during a sea voyage as per the ship owner's request. The patent for the aforementioned device was obtained by the Korean Intellectual property Office dated Dec. 18th,2014.

• International Journal of Naval Architecture and Ocean Engineering
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• 제10권2호
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• pp.180-187
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• 2018

Corrugated bulkhead has been adopted for cargo tank bulkheads of commercial vessels such as bulk carriers, product oil carriers and chemical tankers. It is considered that corrugated bulkhead is a preferred structural solution, compared to the flat stiffened bulkhead, due to several advantages such as lower mass, easier maintenance and smaller corrosion problems. Many researches to find the optimum shape of corrugated bulkhead have been mostly carried out for bulk carriers. Compared to corrugated bulkheads of bulk carriers, ones of chemical tankers are more complicated since they are composed of transverse and longitudinal bulkheads, and they are made of higher priced materials. The purpose of this study is the development of minimum weight design method for corrugated bulkhead of chemical tankers. Evolution strategy is applied as an optimization technique. It has been verified from many researches that evolution strategy searches global optimum point prominently by using multi-individual searching technique. Multi-individual searching methods need excessive time if they connect to 3-D finite element model for repetitive structural analyses. In order to resolve this issue, 2-D beam element connected to deck and lower stool is substituted for a corrugated structure in this study. To verify the reliability of the structural responses by idealized 2-D beam model, they have been compared with ones by 3-D finite element model. In this study, optimum design for corrugated bulkhead of 30 K chemical tanker has been carried out, and the results by developed optimum design program have been compared with design data of existing ship. It is found out that optimum design is about 9% lighter than one of existing ship.

• 한국인구학
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• 제35권2호
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• pp.29-53
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• 2012

이 논문에서는 여성 임금과 출산율의 관계를 미국자료(NLSY79)를 통해 분석하였다. 여성임금은 사회학적 시각에서는 역할충돌을 완화하는 기제로, 경제학적 시각에서는 소득효과와 대체효과가 혼재되어 있는 것으로 이해될 수 있다. 분석 결과, 여성의 시간당 임금과 출산수준은 대체로 부의 상관관계를 보였다. 정의 관계를 보인 경우는 대졸여성의 자녀수와 그녀의 2년 전 시간당 임금의 경우 뿐이었다. 연령대별로 나누어 살펴보면, 나이가 들어갈수록 부의 관계는 약화되는 것으로 나타났다. 하지만 이산형 위험모델을 통한 분석결과, 이러한 관계는 교육수준에 따라 다르게 나타났다. 고졸이하의 여성은 임금이 상승할 때 출산을 줄이는 경향이 나타났지만, 그이상의 학력을 가진 여성은 임금이 상승할 때 오히려 출산을 늘이는 경향이 나타났다. 이는 상대적으로 고소득이 기대되는 고등교육을 바진 여성에게서만 임금상승이 역할 충돌을 완화하는 작용을 성공적으로 하고 있다고 볼 수 있다. 또한 임금상승의 의미가 저학력 여성에겐 대체효과가 더 크고, 고학력 여성에겐 소득효과가 더 크다고 해석될 수 있다. 이는 출산을 미룬 대졸여성들에겐 노동시장에서 성공이 출산에 긍정적 관계를 갖는다는 의미를 보여준다.

• Proceedings of the National Institute of Ecology of the Republic of Korea
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• 제2권4호
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• pp.235-246
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• 2021

This study investigated the impact of baseflow on fish community in the Ungcheon stream (16.5 km long) located downstream of the Boryeong Dam, Korea. Based on field monitoring, there were five dominant fish species in the Ungcheon Stream accounting for 75% of the total fish community: Zacco platypus, Zacco koreanus, Tridentiger brevispinis, Rhinogobius brunneus, and Pungtungia herzi. These five fish species were selected as target species. HydroGeoSphere (HGS) and River2D models were used for hydrologic and hydraulic simulations, respectively. A habitat suitability index model was used to simulate fish habitat. To assess the impact of baseflow, each representative discharge was examined with or without baseflow. The HGS model was used to calculate baseflow within the study reach. This baseflow was observed to increase gradually with longitudinal distance. Validation of the hydraulic model dem onstrated that computed water surface elevated when baseflow was included, which was in good agreement with measured data, as opposed to the result when baseflow was excluded. Composite suitability index distributions and weighted usable area in the study reach were presented for target species. Simulations indicated that the baseflow significantly increased habitat suitability for the entire fish community. These results demonstrate that there should be a substantial focus on the baseflow for physical habitat simulation.

• 디지털융복합연구
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• 제19권9호
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• pp.307-316
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• 2021

본 연구의 목적은 연역적 형태 초점 교수법과 귀납적 형태 초점 교수법이 제2 언어학습자의 문법 성취도에 미치는 영향을 분석하고, 문법 학습에 대한 반응의 변화를 파악하는 것이다. 연구 참여자들은 84명의 대학생으로 연역적 방법을 적용한 집단 29명, 귀납적 방법의 집단 28명과 전통적 방법의 집단 27명이었다. 이들을 대상으로 사전평가 및 사전설문조사 실시하였고, 수업 처치 후 사후평가와 사후설문조사를 진행하였으며 9주 후에 지연 사후평가를 수행하였다. 모든 양적 자료의 통계 처리를 위해 일원배치 분산분석, 대응표본 T-검정, 반복측정 분산분석을 실시하였다. 연구 결과, 두 가지 형태 초점 교수법은 학습자의 문법 성취도 향상에 영향을 미쳤으며 이들의 장기적 지속 효과도 있었던 것으로 나타났다. 한편, 연역적 방법이 성취도에 더 효과적이었던 반면 문법 학습에 대한 반응에 있어서는 귀납적 방법이 더 긍정적인 변화를 보였다. 본 연구 결과는 형태 초점 교수법이 한국의 EFL 상황에서도 충분히 활용할 가치가 있음을 함의한다. 따라서 형태 초점 교수법의 지속 효과에 대해 더 장기적인 변화과정을 관찰하는 후속 연구가 이루어져야 할 것이다.

• 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.

• Journal of Preventive Medicine and Public Health
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• 제54권3호
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• pp.182-189
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• 2021

Objectives: This study investigated the relationship between sleep quality during pregnancy and preterm birth. Methods: This longitudinal study was conducted between August 2018 and May 2019. The participants were 150 pregnant women who had been referred to 7 healthcare centers in the city of Qazvin, Iran and met the inclusion criteria. The Petersburg Sleep Quality Index, the Epworth Sleepiness Scale, and 2 questions about daytime sleep status and a demographic questionnaire were administered at 14-18 weeks and 28-32 weeks of gestation. Data were analyzed using the Mann-Whitney test, the Fisher exact test, and univariate and multivariable logistic regression. Results: In the present study, poor sleep quality affected 84.7% of the participants at 14-18 weeks and 93.3% at 28-32 weeks of gestation. The final model for preterm birth prediction incorporated age and the Petersburg Sleep Quality Index score in the second and third trimesters. Preterm birth increased by 14% with each unit increase in age. With each unit increase in the Petersburg Sleep Quality Index score in the second and third trimesters, preterm birth increased by 42% and 28%, respectively, but the p-values of these factors were not significant. Conclusions: Although a significant percentage of pregnant women had poor sleep quality, no significant relationship was found between sleep quality during pregnancy and preterm birth.

• 사회복지연구
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• 제47권3호
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• pp.161-185
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• 2016

이 연구는 맞벌이 여성의 일가족갈등과 일가족촉진은 현실에서 공존하므로 일가족갈등과 일가족촉진이 우울에 미치는 영향을 통합적으로 검토하기 위해 2012년 여성가족패널 자료 중 맞벌이 여성 2,716명의 자료를 분석하였으며 분석결과는 다음과 같다. 첫째, 일가족갈등과 일가족촉진은 약한 정적 상관관계를 보여 일가족갈등이 증가할수록 일가족촉진도 함께 증가하는 것으로 나타났다. 둘째, 일가족갈등은 자녀의 존재와 배우자의 근로시간, 가족과 함께 보내는 시간과 같은 물리적인 특성에 영향을 받는 것으로 나타났지만 일가족촉진은 배우자지지 변인과 여성의 진보적인 성역할 태도의 영향을 받고 있는 것으로 나타나 차이를 보였다. 셋째, 일가족갈등은 우울을 증가시키는데, 일가족촉진은 우울을 감소시키는데 직접적인 영향을 미치는 것으로 나타났다. 넷째, 일가족갈등이 우울에 미치는 영향은 일가족촉진 수준에 따라 달라지는 것으로 나타났으며 특히 일가족촉진은 일가족갈등이 낮을 때 더 우울을 감소시키는데 영향을 미치는 것으로 나타났다. 이러한 결과는 일과 가정의 병행이 개인에게 미치는 효과를 파악하는데 일가족갈등과 일가족촉진을 동시에 고려할 필요가 있음을 시사한다.