• 전력전자학회:학술대회논문집
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• 전력전자학회 2007년도 하계학술대회 논문집
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• pp.159-162
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• 2007

Comparative study on a low cost sustaining driver with single and dual path energy recovery circuits for plasma display panels (PDPs) is shown in this paper. The cost of PDPs has been still high and about half of the cost has been occupied by driving circuit. A simple sustaining driver is proposed to reduce the cost and size of driving circuit. The proposed driver has small number of devices and reactive components and there are two methods for charging and discharging PDPs such as single and dual path energy recovery circuits. A comparative research on two-types of energy recovery path is practiced to evaluate performance. As a result, the dual energy recovery path circuit has low power consumption, low surge current and high performance. To verify those results, experiment will be shown with 42-inch HD panel.

• Coupled systems mechanics
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• 제11권3호
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• pp.233-257
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• 2022

This work presents a comparative study between two different models: trapezoidal and T-shaped combined footings. The comparative study between trapezoidal and T-shaped combined footings presented in this paper generatesresultsthat have an unparalleled accuracy for all foundation engineering problems. The main part of this research is to obtain the optimal area, reinforcing steel, and thickness of the trapezoidal and T-shaped combined footings using the new models. The comparison is made for two trapezoidal combined footings and two T-shaped combined footings ofreinforced concrete subjected to the same load.Themain findings are: themodelfortrapezoidal combined footings can be used for rectangular and triangular, and the T-shaped combined footings can be used for rectangular. The structure of the paper is asfollowsfirst a very complete state of the art with extensive referencesthat describesthe methodology used for the different models clearly, presents different numerical examples, results and at the end conclusions.

• Spatial Information Research
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• 제11권1호
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• pp.1-12
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• 2003

현재 개별공시지가를 산정하는 과정에서 비교표준지를 선정하는 작업은 지적 담당공무원의 수작업에 의하여 이루어지고 있다. 한정된 시간에 많은 개별필지의 비교표준지 선정 작업으로 인하여, 객관적이고 합리적으로 비교표준지를 선정하기에는 어려움이 있다. 또한 현재 NGIS(국가지리정보체계)나 US(도시정보체계)등에 의한 국가적인 지형정보체계 구축사업이 급속도로 진전되고 있다. 이에 따라 토지의 가치평가의 한 분야인 개별토지의 지가산정 작업도 최신의 자동화된 방법을 적용할 필요성이 증대되고 있다. 따라서, 본 연구에서는 공간 다기준 의사결정 방법 중에서 AHP, Concordance, Ideal Point 방법을 이용하며 비교표준지를 자동으로 선정하였다. 세 가지 방법을 적용하여 나온 결과를 현재의 비교표준지와 비교하여본 결과, Ai)p 방법이 가장 현실성이 있는 대안으로 선정되었다. 본 연구의 결과와 현재 사용중인 비교표준지를 연계하여 이용한다면 좀더 객관적이고 합리적인 비교표준지 선정이 이루어질 것으로 기대한다.

• 아동학회지
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• 제31권6호
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• pp.51-69
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• 2010

This research involved the conducting of an experiment in order to determine the relative effectiveness of constructivist science education when integrated with art experience and constructivist science education for young children. Forty-one children of five years of age in two daycare center classes were assigned to experimental and comparative groups. The experimental and comparative group participated in 15 units. The experimental group participated in science education integrated with art experience, while the comparative group participated in science education. The analysis of covariance revealed significant differences between the mean scores of the two groups on the posttests for science process skills and attitudes. This indicates that the children in the experimental group performed significantly better on the tests than the children in the comparative group. The results of this study suggest that incorporating constructivist science education activities with art experience are good activities for developing young children's science process skills and attitudes.

• Molecules and Cells
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• 제24권1호
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• pp.105-112
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• 2007

Most neuroblastoma cells have chromosomal aberrations such as gains, losses, amplifications and deletions of DNA. Conventional approaches like fluorescence in situ hybridization (FISH) or metaphase comparative genomic hybridization (CGH) can detect chromosomal aberrations, but their resolution is low. In this study we used array-based comparative genomic hybridization to identify the chromosomal aberrations in human neuroblastoma SH-SY5Y cells. The DNA microarray consisting of 4000 bacterial artificial chromosome (BAC) clones was able to detect chromosomal regions with aberrations. The SH-SY5Y cells showed chromosomal gains in 1q12~ q44 (Chr1:142188905-246084832), 7 (over the whole chro-mosome), 2p25.3~p16.3 (Chr2:18179-47899074), and 17q 21.32~q25.3 (Chr17:42153031-78607159), while chromosomal losses detected were the distal deletion of 1p36.33 (Chr1:552910-563807), 14q21.1~q21.3 (Chr14:37666271-47282550), and 22q13.1~q13.2 (Chr22:36885764-4190 7123). Except for the gain in 17q21 and the loss in 1p36, the other regions of gain or loss in SH-SY5Y cells were newly identified.

• 무역상무연구
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• 제37권
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• pp.3-33
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• 2008

This study primarily concerns the seller's duty to deliver the goods in conformity with the contract under the United Nations Convention on International Sale of Goods(1980) in comparison with the Draft Principles of European Sales Law. It describes and analyzes the provisions of the CISG as to the seller's duty, focusing on main controversial issues among scholars in their application. It also attempts to compare the rules of the CISG with those of the Draft PESL and to evaluate them in light of the discipline of comparative law. This is for the purpose of facilitating the systematic development and reform of one jurisdiction by any solution from the other jurisdiction found by the comparative study. In addition, this study provides legal and practical advice to the contracting parties when they intends to insert the CISG or the Draft PESL in their contract as a governing law. The comparative study particularly focuses on the following aspects; first, requirements for conformity with the contract which deals with the concept of conformity with the contract, contractual requirements agreed between contractual parties, and implied requirements otherwise not agreed between contractual parties, second, the time when the goods must be in conformity with the contract, third, exclusions of the seller's duty to deliver the goods in conformity with the contract.

• ETRI Journal
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• 제44권5호
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• pp.794-804
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• 2022

Transformer models have had a great impact on natural language processing (NLP) in recent years by realizing outstanding and efficient contextualized language models. Recent studies have used transformer-based language models for various NLP tasks, including Persian named entity recognition (NER). However, in complex tasks, for example, NER, it is difficult to determine which contextualized embedding will produce the best representation for the tasks. Considering the lack of comparative studies to investigate the use of different contextualized pretrained models with sequence modeling classifiers, we conducted a comparative study about using different classifiers and embedding models. In this paper, we use different transformer-based language models tuned with different classifiers, and we evaluate these models on the Persian NER task. We perform a comparative analysis to assess the impact of text representation and text classification methods on Persian NER performance. We train and evaluate the models on three different Persian NER datasets, that is, MoNa, Peyma, and Arman. Experimental results demonstrate that XLM-R with a linear layer and conditional random field (CRF) layer exhibited the best performance. This model achieved phrase-based F-measures of 70.04, 86.37, and 79.25 and word-based F scores of 78, 84.02, and 89.73 on the MoNa, Peyma, and Arman datasets, respectively. These results represent state-of-the-art performance on the Persian NER task.

• Journal of Korea Trade
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• 제24권8호
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• pp.1-18
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• 2020

Purpose - This paper examines how differently output and input tariffs affect domestic employment across industrial characteristics of comparative advantage such as labor quality and capital intensity. Design/methodology - The paper focuses on 453 Korean industries from 2007 to 2014 because Korea is a typical example of a natural resource-scarce open economy and experienced the transition of the export pattern from labor intensity to technology intensity during this period. Findings - The results show that input tariff reduction stimulated total employment, focusing on the early 2010s, while the effects of output tariff reduction were statistically insignificant in general. However, the stimulation effects of output tariff reduction on employment were found in comparative advantage industries with greater labor quality and capital intensity. As for input tariff reduction, its stimulation effects on employment were more prominent in comparative disadvantage industries with lower labor quality and capital intensity. Originality/value - These results provide significant implications for natural resource-scarce open economies which are experiencing the transition of the export pattern from labor intensity to technology intensity and the unequal distribution of income after trade liberalization: imported intermediate inputs has become increasing important, leading to trade effects on employment and alleviation of income inequality.

• 생약학회지
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• 제43권3호
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• pp.231-238
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• 2012

Menthae herba (MH) extracts exhibit anti-inflammatory effects. The purpose of this study was to determine whether the anti-inflammatory effects of MH extracts vary according to the cultivation regions. We performed a comparative analysis of MH extracts by evaluating the production of inflammatory mediators in RAW 264.7 murine macrophage cells and HaCaT human keratinocyte cells. MH extracts obtained from different cultivation regions in Korea and China significantly reduced the production of nitric oxide (NO), prostaglandin $E_2$ ($PGE_2$), and tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$) in RAW 264.7 cells stimulated with lipopolysaccharide (LPS). No differences in these inhibitory activities were observed between MH extracts. In HaCaT cells stimulated with TNF-${\alpha}$ and interferon-${\gamma}$ (IFN-${\gamma}$), MH extracts did not inhibit the production of macrophage-derived chemokine (MDC/CCL22), but most extracts reduced the production of the regulated on activation normal T-cell expression and secreted (RANTES/CCL5). We used clustering tree analysis of the MH extracts according to the chromatographic pattern and anti-inflammatory potency of MH extracts. We observed differences in the chromatographic pattern of MH extracts but no difference in anti-inflammatory potency. Our findings suggest that MH extracts from different regions do not show any differences in their pharmacological potency in that MH extracts are used as therapeutic agents to treat inflammatory disorders.

• 대한한의학회지
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• 제36권3호
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• pp.84-97
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• 2015

Objectives: The purpose of this study was to investigate and analyze the demands for educational programs on clinical trials of Korean medicine devices, and develop training programs based on the needs of Korean medicine. Methods: This research was conducted targeting 26 volunteer applicants who had participated in clinical trials of Korean medicine devices within the last five years (2010-2015). The survey was carried out between May 1, 2015 and May 26, 2015 via e-mail. After receiving questionnaire replies, the material was established. Using obtained data, frequency analyses were performed using SPSS 20.0 version. Results: 92% of the researchers who participated in the survey expected introduction of educational programs on clinical trials and anticipated that programs contain information that can meet the needs of each researcher. In addition, according to the analysis, introducing expert certification for clinical trials of Korean medicine devices is necessary, and offering related graduate courses are also needed. Conclusions: As a result of this study, researchers had difficulties during clinical trials of Korean medicine devices. If the educational programs were to be developed and institutional frameworks support them effectively, it would prove to be helpful to researchers in clinical trials.