• Journal of the Korean Society for information Management
• /
• v.14 no.1
• /
• pp.77-105
• /
• 1997

The study confirmed that the methods for expanding headings and combined structures among the headings, subdivisions, qualifiers and inverted terms were diverse, and that the headings used for similar purposes do not have identical structural forms. It is also found that the standard symbols representing generic relationship in theasurus, which are introduced in the list of subject headings, do not show precisely the hiearchical relationship of phrase headings. MeSH in pre-coordinated system will be available for retrieval in the computer environment because it can make a link between headings and subdivisions in searching stage. The changes in retrieval circumstances and the seeking behaviors of the users demand that a new structure of subject headings be developed. It was proposed that the modification of the structure in the Hangul subject headings be essential.

• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.1241-1242
• /
• 2007

전세계가 고유가 시대로 들어서면서 각국은 에너지 확보에 전력을 기울이고 있다. 이에 대체 에너지 개발이 미래의 중요한 과제로 여겨지고 있다. 본 연구에서는 결정질 실리콘 태양전지의 대안으로 주목받고 있는 염료감응형 태양전지를 다루어 보았다. 유효면적 $8cm^2$의 염료감응형 태양전지의 직병렬 조합을 이용하여 DSSC 모듈을 만들어 얻은 출력을 전력변환 시킴으로써 상용전원을 얻고자 하였다. 염료감응형 태양전지모듈을 만들기 위해 먼저 DSSC의 단위 셀을 최적화 시키고 이를 실제 광원에서 다양한 직병렬 연결 시도 끝에 모듈로부터 약 5.7V, 3A의 출력을 얻을 수 있었다. 이를 Boost converter를 이용하여 전압을 12V까지 승압하고 이 출력을 고속 스위칭 소자인 MOSFET을 이용하여 스위칭한 Push-pull converter에서 DC 310V까지 승압시켰다. 그리고 그 출력을 DSP를 이용한 20[kHz]의 PWM신호를 만들어 제어한 결과, AC 220V의 상용전원을 얻었다. 그리고 이 전원을 부하에 연결하여 그 동작 특성을 연구하였다.

• Journal of IKEEE
• /
• v.25 no.1
• /
• pp.109-115
• /
• 2021

In this paper, the fine dust detecting terminal which can transmit data in real time was developed. The terminal used a wide spreading LTE network and was powered by solarcell and battery for easy installation and independent operation, because it did not need the wired power grid or wired communication network. The data showed the possibility of forecasting fine dust changes by analyzing with the data from public meteorologic data. The developed terminal will be helpful for predicting and analyse fine dust's more precise flow and effect on environment with an easy installation on any places.

• The Transactions of the Korea Information Processing Society
• /
• v.4 no.11
• /
• pp.2769-2779
• /
• 1997

This Paper Proposes an efficient method for improving the training performance of the neural networks using a hybrid of conjugate gradient backpropagation algorithm and dynamic tunneling backpropagation algorithm The conjugate gradient backpropagation algorithm, which is the fast gradient algorithm, is applied for high speed optimization. The dynamic tunneling backpropagation algorithm, which is the deterministic method with tunneling phenomenon, is applied for global optimization. Conversing to the local minima by using the conjugate gradient backpropagation algorithm, the new initial point for escaping the local minima is estimated by dynamic tunneling backpropagation algorithm. The proposed method has been applied to the parity check and the pattern classification. The simulation results show that the performance of proposed method is superior to those of gradient descent backpropagtion algorithm and a hybrid of gradient descent and dynamic tunneling backpropagation algorithm, and the new algorithm converges more often to the global minima than gradient descent backpropagation algorithm.

• Korean Journal of Poultry Science
• /
• v.38 no.4
• /
• pp.323-330
• /
• 2011

The chicken monoclonal antibody (mAb), 13C8, reacts with sporozoite antigens of Eimeria spp. which causes avian coccidiosis. Since this mAb was produced at low amount due to genetic instability of chicken hybridoma, a recombinant 13C8 single-chain Fv (ScFv) antibody was constructed by amplification of the variable domain of heavy (VH) and light chain (VL) genes of antibody derived from chicken hybridoma. The constructed 13C8 ScFv was successfully expressed in E. coli and purified as a soluble form. In ELISA analysis, this recombinant 13C8 ScFv antibody showed antigen binding activity as the original mAb. In addition, nucleotide sequence comparison of 13C8 gene to the germline chicken VL and VH genes suggested that the gene conversion with $V{\lambda}$ and VH pseudogenes might contribute to the diversification of VL and VH genes in chickens.

• Journal of Life Science
• /
• v.18 no.7
• /
• pp.912-917
• /
• 2008

To investigate the biological activity of recombinant human granulocyte colony-stimulating factor (rec-hG-CSF) in mammalian cells, hG-CSF gene was cloned using the eDNA extracted from the human squamous carcinoma cell lines and rec-hG-CSF was produced in CHO cell lines. To analyze the biological activity in vivo, the rec-hG-CSF protein was injected into mice subcutaneously on days 0 and 2. Blood was withdrawn for white blood cell (WBC) determination 5 days after the first injection. WBC values were found to have increased significantly. A pEGFP-mUII-hG-CSF vector was transfected into somatic cell lines isolated from bovine fetal cells. The colony expressing EGFP signals was observed with a confocal microscope. These data suggest that the rec-hG-CSF produced in this study has potent activity in vivo. Thus, the results of this biological activity show that rec-hG-CSF can be enhanced considerably by genetic engineering that affects potential activity, including mutations, which add the oligosaccharide chain and construct double-fusion proteins. A pEGFP-mUII-hG-CSF vector can be utilized for the production of cloned transgenic livestock.

• KSBB Journal
• /
• v.11 no.4
• /
• pp.445-452
• /
• 1996

To investigate the promoter effect on heterologous gene expression in S. cerevisiae, the recombinant plasmids pYI11, pYI12, pYI10-2, and pYIGP were constructed to contain the inulinase gene (INUI) as a reporter under the control of GAL10, GAL7, GAL1, and GAP promoters, respectively. When the yeasts transformants were cultivated on galactose-containing rich media, the cell growth reached to 36-39 OD600 at 72 hours of cultivation. The specific growth rates of the cells harboring the four different plasmids decreased similarly : they dropped from $0.24 h^{-1}$ during the glucose-consuming period to 0.04 -$0.10 h^{-1}$ during the galactose-consuming period (gene expression phase for GAL promoter system). After the depletion of glucose, the expression of inulinase gene was started and reached to maximal levels of 4.3(GAL1 promoter), 4.0(GAL10 promoter), 3.8(GAL7 promoter), and 1.6(GAP promoter) unit/mL at 72 hours of cultivation. Based on the maximal expression level and activity staining on the plate, the promoter strength was in the order of GAL1, GAL10, GAL7 and GAP promoter. While the GAL-promoter systems showed a high plasmid stabilities of more than 78%, the GAP-promoter plasmid revealed a lower plasmid stability of 55%. Most of inulinase activity (98%) was found in the extracellular medium, indicating that the secretion efficiency of inulinase is independent on the type of promoter.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.26 no.4A
• /
• pp.647-657
• /
• 2006

Probabilistic Risk Assessment considering statistically random variables is performed for the preliminary design of a Cable Stayed Bridge, which is Prestressed Concrete Bridge consisted of cable and plate girders, based on the method of Working Stress Design and Strength Design. Component reliabilities of cables and girders have been evaluated using the response surface of the design variables at the selected critical sections based on the maximum shear, positive and negative moment locations. Response Surface Method (RSM) is successfully applied for reliability analyses for this relatively small probability of failure of the complex structure, which is hard to obtain through Monte-Carlo Simulations. or through First Order Second Moment Method that can not easily calculate the derivative terms of implicit limit state functions. For the analysis of system reliability, parallel resistance system consisting of cables and plate girder is changed into series connection system and the result of system reliability of total structure is presented. As a system reliability, the upper and lower probabilities of failure for the structural system have been evaluated and compared with the suggested prediction method for the combination of failure modes. The suggested prediction method for the combination of failure modes reveals the unexpected combinations of element failures in significantly reduced time and efforts compared with the previous permutation method or system reliability analysis method, which calculates upper and lower bound failure probabilities.

• Journal of the Institute of Electronics Engineers of Korea CI
• /
• v.46 no.3
• /
• pp.107-115
• /
• 2009

Skin color detection is used to classify input pixels into skin and non skin area, and it requires the classifier to have a high classification rate. In previous work, most classifiers used single color model for skin color detection. However the classification rate can be increased by using more than one color model due to the various characteristics of skin color distribution in different color models, and the MLP is also invested as a more efficient classifier with less parameters than other classifiers. But the input dimension and required parameters of MLP will be increased when using two color models in skin color detection, as a result, the increased parameters will cause the huge teaming time in MLP. In this paper, we propose a MLP based classifier with less parameters in two color models. The proposed partially connected MLP based on two color models can reduce the number of weights and improve the classification rate. Because the characteristic of different color model can be learned in different partial networks. As the experimental results, we obtained 91.8% classification rate when testing various images in RGB and CbCr models.

• Journal of the Korean Society for Advanced Composite Structures
• /
• v.2 no.4
• /
• pp.1-10
• /
• 2011

This study investigates the performance of composite (steel-concrete) frame structures through numerical experiments on individual connections. The innovative aspects of this research are in the use of connections between steel beams and concrete-filled tube (CFT)columns that utilize a combination of low-carbon steel and shape memory alloy (SMA) components. In these new connections, the intent is to utilize the recentering provided by super-elastic shape memory alloy tension bars to reduce building damage and residual drift after a major earthquake. The low-carbon steel components provide excellent energy dissipation. The analysis and design of these structures is complicated because the connections cannot be modeled as being simply pins or full fixity ones they are partial restraint (PR). A refined finite element (FE) model with sophisticated three dimensional (3D) solid elements was developed to conduct numerical experiments on PR-CFT joints to obtain the global behavior of the connection. Based on behavioral information obtained from these FE tests, simplified connection models were formulated by using joint elements with spring components. The behavior of entire frames under cyclic loads was conducted and compared with the monotonic behavior obtained from the 3D FE simulations. Good agreement was found between the simple and sophisticated models, verifying the robustness of the approach.