• International journal of advanced smart convergence
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• 제2권1호
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• pp.24-26
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• 2013

In the process of a mobile network evolution to the All-IP, it is inevitable to experience a transient period embracing both circuit and packet based data traffics. At the stage of those hybrid networks, it is important to build them in an efficient manner in terms of resource utilization which is closely related to the overall system operation cost. Especially, the multimedia telephony is one of the essential services in the advanced packet based mobile networks. In this paper an effective method of system operation is proposed for building up the multimedia telephony service while the legacy network co-exists. The proposed solution is based on the careful investigation of the usage pattern of the multimedia services in the evolving networks. This method is also expected to be a useful guideline for the network resource planning.

• 가족자원경영과 정책
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• 제2권1호
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• pp.47-57
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• 1998

This paper delves into philosophical aspects of institutional household(IH) study. The paper argues that it is also necessary to investigate theoretical, methodological, and philosophical issues, not only prescriptive, practical, and managerial ones, in order to establish a field of study as an independent area of academic discipline. In that sense the paper is expected to contribute to the establishment of "the science of IH" as well as the growth of knowledge in that field. For philosophical discussions, the paper first reviews overall sub-fields of philosophy of science such as ontology, epistemology, methodology, and the debate on human nature. Then, it focuses on philosophical issues relating to the nature of IH including (1) the substance of institutional household as scientific investigation, (2) the epistemological basis of IH study, (3) the possibility of normal methodology in studying IH, (4) the values that IH ought to pursue, and (5) the rationale and autonomy of IH study. In the conclusion section, the paper discusses why the study on philosophical aspects in IH is critical in academic community of family resource management.anagement.

• 한국동물위생학회지
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• 제36권2호
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• pp.127-132
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• 2013

An 11-year-old poodle bitch was presented for investigation of multicentric mammary masses. Abdominal sonography and radiography demonstrated abnormal enlargement of uterus and ovaries. Blood analysis revealed high progesterone concentration. The ovariohysterectomy and mastectomy were performed. Histopathologically, the mammary masses revealed complex carcinoma-tubulopapillary carcinoma with papillary pattern and tubule pattern. In the uterus, cystic endometrial hyperplasia was observed. Scattered inflammatory cells were observed in the endometrial stroma and mucinous material was protruded from endometrial surface. Also, in the ovaries, bilateral ovary granulosa cell tumor was detected. The bitch made a complete recovery following the ovariohysterectomy and mastectomy. This case was a very rare multiple tumor occurrence with bilateral ovary granulosa cell tumor and mammary complex carcinoma. High progesterone concentration was characterized clinically in the bitch.

• 한국지열·수열에너지학회논문집
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• 제6권1호
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• pp.29-35
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• 2010

Long-term temperature monitoring has been performed for ground heat exchanger at the Earthquake Research Center (ERC) building in Korea Institute of Geoscience and Mineral Resources (KIGAM). For the 3 years of monitoring, overall temperature increases are observed at various depths within a borehole heat exchanger. But monitoring of ground temperature variation at the monitoring well beforehand showed that geothermal utilization is not the only source for the temperature increase, Because various kinds of sources can cause the ground temperature change, more thorough investigation should be followed.

• Bulletin of the Korean Chemical Society
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• 제35권6호
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• pp.1832-1836
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• 2014

A deep understanding of the metallic silver catalysts formation process on oxide support and the formation mechanism is of great scientific and practical meaning for exploring better catalyst preparing procedures. Herein the thermal decomposition process of supported silver catalyst with silver oxalate as the silver precursor in the presence of ethylenediamine and ethanolamine is carefully investigated by employing a variety of characterization techniques including thermal analysis, in situ diffuse reflectance infrared Fourier transform spectroscopy, scanning electron microscopy, and X-ray diffraction. The formation mechanism of supported silver particles was revealed. Results showed that formation of metallic silver begins at about $100^{\circ}C$ and activation process is essentially complete below $145^{\circ}C$. Formation of silver was accompanied by decomposition of oxalate group and removal of organic amines. Catalytic performance tests using the epoxidation of ethylene as a probe reaction showed that rapid activation (for 5 minutes) at a relatively low temperature ($170^{\circ}C$) afforded materials with optimum catalytic performance, since higher activation temperatures and/or longer activation times resulted in sintering of the silver particles.

• 농촌계획
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• 제10권4호
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• pp.45-54
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• 2004

In this study, the actual states and cases utilizing lake dykes were investigated focusing on large-scale reclamation project in domestic and instances in advanced foreign countries. The attitudes investigation concerning lake dykes utilization was performed to residents in-and-around Saemangeum. According to the research result, in domestic the utilization of lake dyke have not attracted attention because maximizing land use, which was the primary purpose of reclamation project at the early stage, has been emphasized so far. The advanced foreign countries, however, not only make use of farmland, but also develop activities employing lake dykes. According to the result of an analysis for local residents' attitudes, they want to be used Saemangeum lake dykes as a multifunctionality facilities performing a role of environment friendly equipment as well as a breakwater. They also require further investigation and to be introduced new system far utilizing as a multifunctionality facilities. Recently, green tourism is getting attention more and more owing to laying stress on balanced development of country and improvement on life quality of rural residents and launching five days in duty. It is believed that on this favorable trend lake dykes an be employed as a primary tourism resource if its utilization is developed actively.

• Composites Research
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• 제29권6호
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• pp.388-394
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• 2016

Fiber reinforced plastic (FRP) composites have drawn increasing attentions worldwide for decades due to its outstanding properties. Stress concentration factor (SCF) as an essential parameter in materials science are critically considered in structure design and application, strength assessment and failure prediction. However, investigation of stress concentration in FRP composites has been rarely reported so far. In this study, three resource-conserving analyses (Isotropic analysis, Orthotropic analysis and Finite element analysis) were introduced to plot the $K_T^A-d/W$ curve for E-glass/epoxy composite plate with the geometrical defect of circular hole placed centrally. The plates were loaded to uniaxial direction for simplification. Finite element analysis (FEA) was carried out via ACP (ANSYS composite prepost module). Based on the least squares method, a simple expression of fitting equation could be given based on the simulated results of a set of discrete points. Finally, all three achievable solutions were presented graphically for explicit comparison. In addition, the investigation into customized efficient SCFs has also been carried out for further reference.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.842-853
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• 2008

In the construction of dam, the key factor which decides the type of dam is security of materials resource. Because of the large scale earth work, the ability to supply the materials is essential part about economical efficiency. The research is the case study about controlling the plan to secure the material resources in the design of Buhang multipurpose dam. In case of Buhang multipurpose dam, at that time of basic design, it was planned to use a rock fill material. From the detail investigation about the river bed accumulative layer widely spread on the submerged district on the basic design, the research is accomplished to replace rock material with gravel material. After the investigation of whole reserves of gravel material, estimation of conformity as dam construction material from analysis of grain size distribution, the case study of oversea construction, and the material property comparison between rock fill material and gravel fill material, it is verified th possibility of using the gravel fill. Thereafter, the analysis of dam stability using a gravel fill material is accomplished. Finally, A gravel fill material can be used as the main construction material of CFRD, therefore the efficiency of resource recycling in the submerged area is maximized, and the established plan is more advantageous to stability, constructibility, environmentibility than the case of using a rock fill.

• 지구물리와물리탐사
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• 제5권4호
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• pp.299-308
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• 2002

소형루프 전자탐사의 가탐심도를 추정하기 위하여 주파수영역에서 2층구조에 대한 감도를 해석적으로 유도하였다. 이를 기초로 송수신 간격 2m 내외의 다중주파수 전자탐사 기기의 감도를 분석하고, 반응의 크기를 기준으로 가탐심도를 추정하였다. 먼저 감도 계산 결과는 하부층에 대한 감도는 동상성분이 이상성분에 비해 매우 높고 상부층의 두께가 20m에 이르더라도 저주파수 대역에서는 상부층의 감도에 비해 절대적으로 크다는 것을 나타낸 반면, 이상성분은 하부층에 대한 감도가 매우 약함을 보여준다. 따라서 다중 주파수를 이용한 소형루프 전자탐사에서는 동상성분의 정확한 측정이 가탐심도의 증대에 필수적임을 입증하였다. 전기비저항이 100ohm-m인 상부층 밑에 10ohm-m의 전기비저항을 갖는 하부층이 존재할 경우에는, 동상성분의 정확한 측정을 통하여 잡음 수준을 고려하더라도 10m까지의 가탐심도를 충분히 확보할 수 있으며 따라서 매립장의 침출수 분포 범위 영상화 등을 위해서 유용할 것으로 보인다. 그러나 전기비저항이 1,000ohm-m로 높은 기반암이 존재할 경우에는 비록 하부층의 감도는 상부층에 비해 매우 높으나 반응의 절대값이 매우 미약하여 탐지가 어려우며 이상성분 자료와의 복합적인 해석을 통해서도 기기의 정확도를 고려할 때, 가탐심도가 5 m를 넘기 힘든 것으로 나타났다. 따라서 전기비저항이 높은 지역에서는, 송수신 간격이 2m 내외로 짧은 다중주파수 소형루프 전자탐사법이 금속성 매설물의 탐지를 위해서는 유용하지만 기반암의 심도 규명에는 적절치 않다.

• Molecules and Cells
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• 제22권3호
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• pp.323-327
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• 2006

DNA barcoding, an inventory of DNA sequences from a standardized genomic region, provides a bio-barcode for identifying and discovering species. Several recent studies suggest that the sequence diversity in a 648 bp region of the mitochondrial gene for cytochrome c oxidase I (COI) might serve as a DNA barcode for identifying animal species such as North American birds, insects and fishes. The present study tested the effectiveness of a COI barcode in discriminating Korean bird species. We determined the 5' terminus of the COI barcode for 92 species of Korean birds and found that species identification was unambiguous; the genetic differences between closely related species were, on average, 25 times higher than the differences within species. We identified only one misidentified species out of 239 specimens in a genetic resource bank, so confirming the accuracy of species identification in the banking system. We also identified two potential composite species, calling for further investigation using more samples. The finding of large COI sequence differences between species confirms the effectiveness of COI barcodes for identifying Korean bird species. To bring greater reliability to the identification of species, increased intra- and interspecies sampling, as well as supplementation of the mitochondrial barcodes with nuclear ones, is needed.