• Journal of Fisheries and Marine Sciences Education
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• v.21 no.2
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• pp.199-212
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• 2009

The purpose of this study is to analyze the cost-effectiveness analysis on on-line and off-line extra-curricula education(ECE). Based on a review of relevant literature, on-line ECE is defined as internet based learning, and off-line ECE is defined as on-site learning out of school such as private cram schools and private tutoring. The results of this study are as follows: First, sixty nine percent of the subjects were received ECE. Off-line ECE is more dominant than on-line ECE. Second, cost for off-line ECE is more expensive than on-line ECE. Third, off-line ECE is more effective than on-line ECE, when cost is ignored. Fourth, on-line ECE is more cost-effective than off-line ECE.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.747-748
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• 2008

In this paper, we propose a new algorithm for task scheduling consisting of subtask partitioning and subtask priority scheduling steps in order to keep the peak power under the system specification. The subtask partitioning stepis performed to minimize the idle operation time for processors by dividing a task into multiple subtasks using the least square method developed with power consumption pattern of tasks. In the subtask priority scheduling step, a priority is assigned to a subtask based on the power requirement and the power variation of subtask so that the peak power violation can be minimized and the task can be completed within the execution time deadline.

• Fisheries and Aquatic Sciences
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• v.17 no.1
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• pp.19-25
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• 2014

We investigated the effects of Ecklonia cava ethanol extract (ECE) on sleep architecture and sleep profiles. ECE was orally administered at a dose of 100, 250, or 500 mg/kg to C57BL/6N mice and its effects were measured by recording electroencephalogram (EEG) and electromyogram. Administration of ECE (250 and 500 mg/kg) significantly induced non-rapid eye movement sleep (NREMS) without affecting rapid eye movement sleep. The increase in NREMS by ECE (500 mg/kg) was significant (P < 0.05) during the first 2 h after administration. In addition, ECE had no effect on EEG power density (an indicator of sleep quality) in NREMS. These results suggest that ECE induces NREMS in a manner similar to physiological sleep.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2002.10a
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• pp.405-408
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• 2002

The electrical conductivity, EC is a major indicator of soil salinity. Measuring EC of saturation-paste extract of soil, ECe, is the standard way to evaluate soil salinity. However much of the data on soil salinity have been obtained by measuring the EC of the 1:5 soil-to-water extract, EC(1:5) or salts contents(%) which multiplied by conversion factor. And, thus we attempted to collect and analysis 90 soil samples at 9 reclaimed tidelands in Korea and to derive a relationship between ECe and dilution factor at ECe and EC(1:5), $DF_{1:5}$ of 3 soil textural conditions and 6 salinity conditions. Regression equations between ECe and $DF_{1:5}$ were obtained $ECe=1.4701ln(DF_{1:5})+5.0974(r^2=0.97^{**})$ in case of more than 50% silt contents, $ECe=2.1399ln(DF_{1:5})+5.3462 (r^2=0.99^{***})$ in case of below 50% silt contents, and $ECe=1.5927ln(DF_{1:5})+5.2486 (r^2=0.98^{***})$ in all cases, and then we suggested the $DF_{1:5}\;and\;DF_%$ of 3 soil textural conditions and 6 salinity conditions.

• Journal of Microbiology and Biotechnology
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• v.29 no.1
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• pp.11-20
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• 2019

Ecklonia cava, an edible marine brown alga (Laminariaceae), is a rich source of bioactive compounds such as fucoidan and phlorotannins. Ecklonia cava extract (ECE) was prepared using 70% ethanol extraction and ECE contained 67% and 10.6% of total phlorotannins and dieckol, respectively. ECE treatment significantly inhibited receptor activator of nuclear $factor-{\kappa}B$ ligand (RANKL)-induced osteoclast differentiation of RAW 264.7 cells and pit formation in bone resorption assay (p <0.05). Moreover, it suppressed RANKL-induced $NF-{\kappa}B$ and mitogen-activated protein kinase signaling in a dose dependent manner. Downregulated osteoclast-specific gene (tartrate-resistant acid phosphatase, cathepsin K, and matrix metalloproteinase-9) expression and osteoclast proliferative transcriptional factors (nuclear factor of activated T cells-1 and c-fos) confirmed ECE-mediated suppression of osteoclastogenesis. ECE treatment ($100{\mu}g/ml$) increased heme oxygenase-1 expression by 2.5-fold and decreased intercellular reactive oxygen species production during osteoclastogenesis. The effective inhibition of RANKL-stimulated osteoclast differentiation and oxidative stress by ECE suggest that ECE has therapeutic potential in alleviating osteoclast-associated disorders.

• Korean Journal of Soil Science and Fertilizer
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• v.36 no.4
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• pp.193-199
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• 2003

Electrical conductivity (EC) is a major indicator of soil salinity. Measurement of EC in saturation-paste extract of soil (ECe) is a standard way to evaluate soil salinity. However, many of the data on soil salinity have been obtained by measuring the EC of 1:5 soil-water extract (EC1:5) or salt percentage which is calculated from EC1:5 by multiplying a conversion factor. We analyzed 90 soil samples collected from 9 reclaimed tidelands in Korea, and derived relationships between ECe and dilution factors (DF1:5) which can convert EC1:5 to ECe in 2 soil textural groups at 5 salinity levels. Regression equations between ECe and DF1:5 were DF1:5 = 1.3624In(ECe) + 5.1386($r^2=0.37^{***}$) for soils of more than 50% silt content, DF1:5 = 1.9505In(ECe) + 5.3679($r^2=0.66^{***}$) for soils of less than 50% silt content. And the relationship for all soils investigated was DF1:5 = 1.4001In(ECe) + 5.4865($r^2=0.51^{***}$). From the relationships, conversion factors for calculation of ECe from EC1:5 of salt percentage data were estimated for soils of different textures and salinity levels.

• Proceedings of the KIEE Conference
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• 2002.07d
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• pp.2313-2315
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• 2002

본 논문에서는 3상 유도 전동기 고정자 전류 신호로부터 고정자 권선 고장에 대한 특성주파수를 효과적으로 검출하기 위한 고정자 전류 신호 해석 기법을 제시하였으며, 인위적인 턴 대 턴 고장 전동기의 부하실험을 통해 제안된 기법의 유효성을 확인하였다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.4
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• pp.484-492
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• 2023

The structural behaviour of concrete beam was examined by the three points bending test after the completion of the electrochemical chloride extraction (ECE), rather than bond strength mostly measured in previous studies. It was found that the flexural rigidity of concrete was lowered by the ECE, but the strength was enhanced in terms of the maximum load.The flexural rigidity, in the linear elastic range, was reduced by the loss of effective cross-section area. In fact, the inertia moment was substantially subjected to 70 % loss of the cross-section by the tensile strain at the condition of the failure. However, a lower rate of the inertia moment reduction was achieved by the ECE, implying the higher resistance to the cracking, but the higher risk of deformation.

• Korean Journal of Child Studies
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• v.21 no.1
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• pp.283-294
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• 2000

The purpose of this study was to determine early childhood education(ECE) and early childhood special education(ECSE) teachers' perceptions of (a)important teacher competencies needed for working in inclusive early childhood programs and (b)current levels of these competencies. Sixty-two ECE teachers and 77 ECSE teachers responded to the survey developed for this study. There were no differences between the ECE teachers and ECSE teachers in the ratings of importance of the competency domains. However, the ECSE teachers had significantly higher perceptions than the ECE teachers of their self-proficiency on competencies related to child development, curriculum and instruction, assessment procedures, working with other adults, and professionalism. Both the ECE and ECSE teachers perceived the greatest need for further training in competencies related to assessment procedures and working with families and other adults.

• Korean Journal of Veterinary Research
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• v.53 no.3
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• pp.175-176
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• 2013

The object of this study was to evaluate recurrence of equine coital exanthema (ECE) whether re-infection or re-activation of causative virus. ECE is a venereal disease of horses caused by equine herpesvirus type 3 (EHV-3). Like other herpesviruses, it may persist in infected horses for a long time. There is a controversy on the cause of ECE as the recurrence or the reinfection. This disease had occurred firstly on stallions and broodmares in Korea. The horses had rebreeded after healing routinely. Next year, the disease recurrented on the just same affected horses among stallions. The result of this study, re-outbreak of ECE in stallions is recurrence of ECE, but not reinfection of the virus.