• Journal of The Korean Society of Agricultural Engineers
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• v.58 no.5
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• pp.91-99
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• 2016

High resolution rainfall data at 1-hour or a finer scale are essential for reliable flood analysis and forecasting; nevertheless, many observations, forecasts, and climate projections are still given at coarse temporal resolutions. This study aims to evaluate a chaotic method for disaggregation of 6-hour rainfall data sets so as to apply operational 6-hour rainfall forecasts of the Korean Meteorological Association to flood models. We computed parameters of a state-of-the-art multiplicative random cascade model with two combinations of cascades, namely uniform splitting and diversion, using rainfall observations at Seoul station, and compared statistical performance. We additionally disaggregated 6-hour rainfall time series at 58 stations with the uniform splitting and evaluated temporal transferability of the parameters and changes in multifractal properties. Results showed that the uniform splitting outperformed the diversion in reproduction of observed statistics, and hence is better to be used for disaggregation of 6-hour rainfall forecasts. We also found that multifractal properties of rainfall observations has adequate temporal consistency with an indication of gradually increasing rainfall intensity across South Korea.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.05a
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• pp.213-217
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• 1999

This paper describes a methodology of database synchronization between ship and land. Through this synchronization, consistency can be maintained between land's database and ship's database. Onboard useful data is sent from ship's database to land' database at time interval via the INMARSAT-C which satisfies with the GMDSS requirements and supports transport service. eased on the result of the paper, user can access land's database which is synchronized with ship's database.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.10a
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• pp.590-594
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• 2000

One of the most important factors for a leather quality inspection is its surface condition. So far a leather quality level has been discriminated by human's eye inspection, But, these kinds of method needs a lot of labor time and cause decision mistakes from an optical illusion. It means leather quality inspection is very subjective and there is no consistency. In this study, we present computer vision based a leather quality inspection system using an Artificial intelligence. Suggested system ran give standard spec for a leather quality and take human inspection duty place.

• Journal of information and communication convergence engineering
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• v.10 no.1
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• pp.11-20
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• 2012

In a marine ubiquitous sensor network (USN) system using expensive sensors in the harsh ocean environment, it is very important to discover failures and devise recovery techniques to deal with such failures. Therefore, in order to perform failure modeling, this study analyzes the USN-based real-time water quality monitoring service of the Gaduri Aqua Farms at Songdo Island of Yeosu, South Korea and devises methods of discovery and recovery of failure by classifying the types of failure into system element failure, communication failure, and data failure. In particular, to solve problems from the perspective of data, this study defines data integrity and data consistency for use in identifying data failure. This study, by identifying the exact type of failure through analysis of the cause of failure, proposes criteria for performing relevant recovery. In addition, the experiments have been made to suggest the duration as to how long the data should be stored in the gateway when such a data failure occurs.

• Journal of Advanced Navigation Technology
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• v.15 no.3
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• pp.419-431
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• 2011

Design traceability has been widely recognized as being an integral aspect of software development. Also many projects for software application development have failed because that the projects did not analyze user requirements sufficiently and reflected them in the projects adequately. This thesis proposes a specification and tracing technique for object-oriented analysis and design. The subject of this study is the artifacts of UML development methodology. Therefore, to improve the quality of the software development cycle, in short, the system requirement of customers will be able to respond quickly.

• Hwankyungkyoyuk
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• v.20 no.4
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• pp.145-165
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• 2007

The purpose of this study is to investigate items for improving environmental education in elementary school for the more efficiency policies of environmental education. In this study, we investigated the relative importance of each items through Analytic Hierarchy Process for the various groups of the expert who is related with environmental education. We made hierarchical structure for efficiency education through brainstorming process. The hierarchical structure consisted of 3 high-level items and 8 low-level items. The questionnaires were distributed to 4 groups with 187 experts. After the consistency test of returned questionnaires, we gained 60 available questionnaires of experts. According to the generalization results of all groups, "The pro-environmental attitude of the teacher" is the most important. The second important thing is "The pro-environmental attitude of the schoolmaster" and the third is "Experiential learning and on-the-spot study concerning environment". And the following are "Budget for environmental education" and "Environmental education in discretionary activity", "Teaching materials for environmental education", "The cultivation of the experts on environmental education", "Environment event in school" in order. As the result, we have to intensify the pro-environmental attitude of the teachers and schoolmasters and develop experiential learning and on-the-spot study programs concerned environment to improve environmental education. At the same time, we need the more politic support related with budget for environmental education.

• Korean Journal of Optics and Photonics
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• v.10 no.5
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• pp.391-395
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• 1999

We present the measurement of the diffraction efficiency and response time of the photorefractive grating recorded in $LiNbO_3$ photorefractive crystal doped with 4%-mole MgO. Two laser sources were used in the experiments; frequency-doubled Q-switched Nd:YAG laser ($\lambda$=532 nm) and cw Ar-ion laser ($\lambda$=514.5 nm). The same optical geometry was also used in both experiments in order to maintain the experimental consistency. Using the two-wave mixing scheme in both experiments we measured the maximum diffraction efficiency in the range of beam intensity of 1.6~100 W/ $\textrm{cm}^2$, and the response times for both cases of recording and erasing. Two sets of results obtained from the experiments are compared and analyzed.

• Asian Pacific Journal of Cancer Prevention
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• v.14 no.1
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• pp.165-171
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• 2013

The aim of the present study was to analyze the expression of FHIT and WWOX in nasopharyngeal carcinoma (NPC) and correlations with clinical pathologic features. mRNA expression of the FHIT and WWOX was assessed by real-time fluorescent relatively quantitative PCR in 61 NPC tissues and 45 non-cancerous nasopharyngeal tissues. As a result, mRNA expression levels of both FHIT and WWOX were significantly lower in NPC patients than in control samples (P=0.049 and 0.045, respectively). Moreover, the mRNA expression of both had an inverse relation with larger invasive range (P=0.035 and 0.048, respectively), poor histologic differentiation (P=0.012 and 0.016) and advanced clinical stage (P=0.026 and 0.038). Consistency was found between expression of FHIT and WWOX in the same NPC tissues (r=0.681, P=0.00). In conclusion, synergy between FHIT and WWOX may exist in the development of NPC so that the two factors may be considered as important genetic markers. Detecting the expression of FHIT and WWOX should provide clinically significant information relevatn to tumor diagnosis, progression and treatment modalities for NPC.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.47 no.4
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• pp.88-95
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• 2010

As the development of IT technologies, storages stored very sensitive data which should not be damaged, too. It increased the importance of data backup and makes the time need to backup data important issues. Snapshot is one of the backup technologies which needs short downtime to maintain consistency of data during backup data. In this paper, we studied two kinds of snapshots, local file system based snapshot and network file system based snapshot. In the local file system based snapshot part, we propose the PSnap which is a snapshot library for non-snapshot file system as like Ext2, Ext3 and XFS. In another part, network file system based snapshot, we propose the GlorySnap which snapshot utilities for GloryFS is a distributed file system was made by ETRI.

• JSTS:Journal of Semiconductor Technology and Science
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• v.15 no.4
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• pp.454-461
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• 2015

Light enhancement of GaN based light emitting diodes (LEDs) have been investigated by texturing the top p-GaN surface. Nano-textured LEDs have been fabricated using self-assembled Ni nano mask during dry etching process. Experimental results were further compared with simulation data. Three types of LEDs were fabricated: Conventional (planar LED), Surface nano-porous (porous LED) and Surface nano-cluster (cluster LED). Compared to planar LED there were about 100% and 54% enhancement of light output power for porous and cluster LED respectively at an injection current of 20 mA. Moreover, simulation result showed consistency with experimental result. The increased probability of light scattering at the nano-textured GaN-air interface is the major reason for increasing the light extraction efficiency.