• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVII)
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• pp.491-491
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• 2005

• Korean Journal of Radiology
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• 제20권6호
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• pp.880-893
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• 2019

Objective: To assess the technical performance of two-dimensional shear wave elastography (2D-SWE) for measuring liver stiffness. Materials and Methods: The Ovid-MEDLINE and EMBASE databases were searched for studies reporting the technical performance of 2D-SWE, including concerns with technical failures, unreliable measurements, interobserver reliability, and/or intraobserver reliability, published until June 30, 2018. The pooled proportion of technical failure and unreliable measurements was calculated using meta-analytic pooling via the random-effects model and inverse variance method for calculating weights. Subgroup analyses were performed to explore potential causes of heterogeneity. The pooled intraclass correlation coefficients (ICCs) for interobserver and intraobserver reliability were calculated using the Hedges-Olkin method with Fisher's Z transformation of the correlation coefficient. Results: The search yielded 34 articles. From 20 2D-SWE studies including 6196 patients, the pooled proportion of technical failure was 2.3% (95% confidence interval [CI], 1.3-3.9%). The pooled proportion of unreliable measurements from 20 studies including 6961 patients was 7.5% (95% CI, 4.7-11.7%). In the subgroup analyses, studies conducting more than three measurements showed fewer unreliable measurements than did those with three measurements or less, but no intergroup difference was found in technical failure. The pooled ICCs for interobserver reliability (from 10 studies including 517 patients) and intraobserver reliability (from 7 studies including 679 patients) were 0.87 (95% CI, 0.82-0.90) and 0.93 (95% CI, 0.89-0.95), respectively, suggesting good to excellent reliability. Conclusion: 2D-SWE shows good technical performance for assessing liver stiffness, with high technical success and reliability. Future studies should establish the quality criteria and optimal number of measurements.

• 농업과학연구
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• 제37권3호
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• pp.509-514
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• 2010

The purpose of this study is to analyze the technical efficiency and its determinants for Korean Apiculture farming by using from door to door and e-mail inquiry data. The analysis was implemented through the Cobb-Douglas stochastic frontier production function (SFPF) model including the technical inefficiency effect model for cross-sectional data. To measure the SFPF model, honey production was used for a dependent variable, and for input variables labor cost, preventive cost, material cost, feeding cost, depreciation cost were used. Farmer's age, farmer's career, farming scale, full-time or half-time firm and movement or fixed firm variables were used to measure the inefficiency effect model. The average technical efficiency on apiculture farming in Korea is estimated to be 0.8112. It means that there were technical inefficiency of about 18.88% in Korea apiculture farming. In this study there are some suggestions which could increase the technical efficiency of Korean apiculture farming.

• 한국비블리아학회지
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• 제25권1호
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• pp.193-215
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• 2014

이 연구는 도서관 정리부서 변화 요인을 조사하고 국내 대학도서관 정리부서 조직 현황과 변화에 관한 사서들의 인식을 살펴봄으로써, 정리부서 조직 개선을 위한 변화와 발전 방향을 파악하고자 하였다. 도서관 정리부서의 변화의 주요 요인은 분담편목과 아웃소싱, 그리고 다양한 형태의 전자자원과 이에 대한 메타데이터 생성이었다. 국내 32개 대학도서관 정리부서 담당자를 대상으로 정리부서 현황과 조직 변화에 대한 인식을 조사 분석한 결과, 대부분 정리전문사서의 양성, 정리부서 체제의 변화가 필요한 시점이라고 응답하였으며, 전통적인 편목과 함께 전자자원에 대한 메타데이터 업무가 통합된 형태로 운영되는 것이 바람직하다고 인식하고 있었다. 하지만 현재까지는 대학도서관 전반적으로 메타데이터 관련 업무가 분산되어 있었고, 정리부서 내에서 담당하지 않는 메타데이터 관련 업무에 대한 파악이 부족한 것으로 조사되었다.

• 대한공업교육학회지
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• 제33권2호
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• pp.26-43
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• 2008

이 연구는 공업고등학교 졸업생이 대학의 동일계 학과에 진학했을 때 동일 과목 학점 인정에 관한 전문가의 인식을 조사하는 데 목적이 있다. 오늘날 대학 교육이 일반화되면서 공업고등학교 졸업생의 80% 정도가 대학에 진학하고 있다. 그러므로 공업고등학교와 전문대학, 4년제 공과대학이 연계 교육 차원에서 동일 과목 학점 인정은 교육적 낭비를 줄이기 위해 필요하다. 이 연구에서는 공업교육 분야 전문가인 공업고등학교 교사, 연구원, 전문대학 및 4년제 공과대학 교수 100명을 대상으로 설문 조사하여 84명이 응답하였으며 응답률은 81,25%였다. 이 연구에서 얻어진 결과를 요약하면 다음과 같다. 첫째, 공업고등학교 교사와 연구원은 공업고등학교 졸업생이 대학의 동일 학과에 진학했을 때 공업고등학교에서 이수한 모든 실습 과목 학점은 인정해 주는 것이 타당하다고 한 반면 전문대학과 4년제 대학 교수는 응답자의 대부분이 바람직하지 않다는 반응을 보였다. 둘째, 공업고등학교 졸업생이 전문대학 또는 4년제 공과대학 동일 학과에 입학했을 때 동일 과목은 대학 자체 소정의 시험을 거쳐 학점을 인정해 주는 것을 연구원과 4년제 대학 교수는 대부분 동의하였으나 전문대학 교수는 62.5%가 반대하였다. 셋째, 공업고등학교 졸업생이 전문대학 동일 학과를 졸업하고 4년제 공과대학 동일학과 3학년에 편입했을 때에 동일 과목은 4년제 대학 자체 인증 시험 성적이 일정 수준 이상일 때 학점 인정을 해 주는 것을 응답자 대부분이 동의하였다. 그러므로 이와 같은 경우에는 학점 인정을 해 주는 것이 타당하다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제45권5호
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• pp.299-299
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• 2019

• Membrane and Water Treatment
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• 제12권1호
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• pp.11-21
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• 2021

A novel activated carbon produced from cherry laurel (Laurocerasus officinalisRoem.) seeds (CLSAC) by chemical activation with ZnCl2 was used as an adsorbent to remove Cr(VI) ions from aqueous solutions. CLSAC was characterized by several techniques and the adsorption experiments were performed in a batch model adsorption technique. The effects of various experimental parameters were investigated as a function of solution pH, contact time, initial Cr(VI) concentration, CLSAC concentration, and temperature. The monolayer adsorption capacity of CLSAC was found to be 41.67 mg g-1 for 5.0 g L-1 of CLSAC concentration and, it was concluded that CLSAC can be used as an effective adsorbent for removal of Cr(VI) from waters and wastewaters.

• Earthquakes and Structures
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• 제6권2호
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• pp.141-161
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• 2014

This article presents a new generation of empirical ground motion models for the prediction of response spectral accelerations in soil conditions, specifically developed for the Vrancea intermediate-depth seismic source. The strong ground motion database from which the ground motion prediction model is derived consists of over 800 horizontal components of acceleration recorded from nine Vrancea intermediate-depth seismic events as well as from other seventeen intermediate-depth earthquakes produced in other seismically active regions in the world. Among the main features of the new ground motion model are the prediction of spectral ordinates values (besides the prediction of the peak ground acceleration), the extension of the magnitudes range applicability, the use of consistent metrics (epicentral distance) for this type of seismic source, the extension of the distance range applicability to 300 km, the partition of total standard deviation in intra- and inter-event standard deviations and the use of a national strong ground motion database more than two times larger than in the previous studies. The results suggest that this model is an improvement of the previous generation of ground motion prediction models and can be properly employed in the analysis of the seismic hazard of Romania.

• Structural Monitoring and Maintenance
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• 제2권4호
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• pp.319-338
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• 2015

The electro-mechanical impedance (EMI) technique makes use of surface-bonded lead zirconate titanate (PZT) patches as impedance transducers measuring impedance variations monitored on host structural components. The present experimental work further evaluate an alternative to the conventional EMI technique which performs measurements of the variations in the output voltage of PZT transducers rather than computing electromechanical impedance (or admittance) itself. This paper further evaluates a variant of the EMI approach presented in a previous work of the present authors, suitable, for low-cost concrete structures monitoring applications making use of a credit card-sized Raspberry Pi single board computer as core hardware unit. This monitoring approach is also deployed by introducing a new damage identification index based on the ratio between the area of the 2-D error ellipse of specific probability of EMI-based measurements containment over that of the 2-D error circle of equivalent probability. Experimental results of damages occurring in concrete cubic and beam specimens are investigated under increasing loading conditions. Results illustrate that the proposed technique is an efficient approach for identification and early detection of damage in concrete structures.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제22권2호
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• pp.171-180
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• 2019

Purpose: Malnutrition may influence neurocognitive development in children by directly affecting the brain structural development, or indirectly by affecting the children's cognition experience. Malnutrition alters the cell numbers, cell migration, synaptogenesis, and neurotransmission due to inadequate availability of necessary micronutrients to support cell growth. We aimed to analyze neurocognitive development in infants with malnutrition and its association with long chain polyunsaturated fatty acids (LC-PUFA), micronutrients levels and magnetic resonance spectroscopy (MRS) findings. Methods: The study included two groups; group 1, infants with malnutrition (n=24), group 2; healthy infants (n=21). Peripheral blood was obtained from the participants for studying micronutrients and LC-PUFA levels. The neurocognitive development was analyzed by the use of an Ankara Developmental Screening Inventory test. MRS were performed on all infants. Results: All parameters of neurocognitive development and serum calcium ($9.6{\pm}0.9mg/dL$ vs. $10.4{\pm}0.3mg/dL$, p<0.05) and magnesium ($2.02{\pm}0.27mg/dL$ vs. $2.2{\pm}0.14mg/dL$, p<0.05) levels were noted as being low in infants with marked malnutrition. No difference was found in LC-PUFA levels between healthy and malnourished infants. Thalamic choline/creatine levels were significantly high in infants with malnutrition ($1.33{\pm}0.22$ vs. $1.18{\pm}0.22$, p<0.05). Total neurocognitive development in infants was positively correlated with serum calcium levels (p<0.05, r=0.381). Conclusion: Calcium supplementation may improve neurocognitive development in malnourished infants.