• The Transactions of The Korean Institute of Electrical Engineers
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• v.66 no.1
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• pp.1-6
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• 2017

Total capacity of pumped hydro storage(PHS) in Korean power system reaches 4,700MW, though the share of it is about 4.56% of total capacity The Unit Commitment program, E-terracommit which is used for the operational purpose by KPX, includes the PHS model. But the model has a defect that it does not include the information of water level of upper reservoir. Therefore two types of improved the PHS models are represented in this paper. The first model is a optimized model by connecting the upper reservoir water level to the non-spinning reserve. The other model is to have priority allocate both the PHS and combined cycle generator for non-spinning reserve. The proposed two models and the E-terracommit model is compared and resulting to have improvement in estimating non-spinning reserve when using the proposed models.

• Mass Spectrometry Letters
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• v.14 no.4
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• pp.173-177
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• 2023

Kendrick plots offer an alternative visualization of mass spectral data which reveals ion series and patterning by turning a mass spectrum into a map, plotting the fractional mass (wrongly called mass defect) as a function of mass-to-charge ratios and ion abundances. Although routinely used for polymer mass spectrometry, two unreported applications of these Kendrick plots are proposed using the program "kendo2": the graphical recalibration of a mass spectrum via the simulation of a theoretical fractional mass and a multi-segment fit; and the rapid evaluation of scan-to-scan variation of accurate mass measurements used as tolerances for the blank subtraction of UPLC-MS data files. Both applications are compatible with any type of high-resolution MS data including LC/GC-MS(/MS).

• Journal of The Korean Society of Agricultural Engineers
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• v.48 no.7
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• pp.55-63
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• 2006

Bacterial transport models were evaluated in this study to determine the suitable model at describing bacterial transport in saturated column experiments. Four models used in the evaluation were: advective-dispersive equation (ADE) + equilibrium sorption/retardation (ER) + kinetic reversible sorption (KR) (Model I), ADE + two-site sorption (Model 2), ADE + ER + kinetic irreversible sorption (KI) (Model 3), ADE + KR + KI (Model 4). Firstly, analyses were performed with the first experimental data, showing that Model 4 is appropriate for describing bacterial transport. Even if Model 1 and 2 fit well to the observed data, they have a defect of not including the irreversible sorption, which is directly related to mass loss of bacteria. Model 3 can not properly describe the tailing observed in the data. However, further analysis with the second data indicates that Model 4 can not describe retardation of bacteria, even if the sorption-related parameters are varied. Therefore, Model 4 is modified by incorporating retardation factor into the model, resulting in the improved fitting to the data. It indicates that the transport model, into which retardation, kinetic reversible sorption, and kinetic irreversible sorption are incorporated, is suitable at describing bacterial transport in saturated column experiments. It is expected that the selected transport model could be applied to properly analyze the bacterial transport in saturated porous media.

• Journal of the Society of Naval Architects of Korea
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• v.38 no.3
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• pp.54-61
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• 2001

It is expected that ISO issue a standard method for sea trial and the correction of data taken during speed trial. One of the major reason for this effort(or trend) is to get reliable and accurate sea trial measurement. With the same philosophy, SHI(Samsung Heavy Industries) developed a nautical signal integrated unit in 1996. Two years after this, SHI developed a software that enable the user to analyze the sea trial measurement on-board. After a series of stationary and performance tests, KR has issued a certificate for international application of the software. We have been utilizing this program for the measurement and analysis of sea trial of more than 70 ships built in SHI shipyard. However, one critical defect of the software has been that it can be applied only for single shaft vessels. In this short paper, we would like to introduce a new version of the software which can be used for both single and multi thruster vessels. This paper deals with the introduction, test method and some of the test result.

• Journal of Korean society of Dental Hygiene
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• v.12 no.2
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• pp.409-417
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• 2012

Objectives : The purpose of this study is to figure out and establish the basic data that can help improve management of oral healthcare for the international marriage immigrant women. Methods : In this sense, we surveyed questions on 237 women out of 1,300 immigrant women, who have participated in the program by multi-cultural household supporting center, in a fashion of face-to-face investigation and on-the-spot direct cavity inspection simultaneously from May 1 to October 31, 2010. Collected data were electro-statistically computerized under SPSS 17.0 program and analyzed with frequency analysis, recurrence analysis and logistic regression analysis respectively. Results : The number of filled teeth got lower when they had lower number of dental visits. Women from the Philippines had the highest number of defect teeth, and the number of fixed prosthetic appliance became less when they had less number of dental visits. When they had no experience of oral health education, they had less fixed prosthetic appliances. There was higher percentage of periodontal disease when they did not have dental visit compared with the dental visit cases. Conclusions : Preparation of a policy for east Asian immigrant women for them to visit dentist comfortably and expansion of systematic oral health education are highly recommended.

• Archives of Craniofacial Surgery
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• v.10 no.1
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• pp.7-13
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• 2009

Purpose: Endoscopic transnasal correction of the medial orbital fractures cannot be enable to confirm the reduction degree of orbital volume without imaging modalities. We have intended through this study to make a quantative analysis of preoperative orbital volume increment and the reduction degree of that after ethmoidal sinus packing by using CT scan. Methods: In this retrospective study, 22 patients were selected to evaluate the postoperative volume reduction, who took 2 CT scans which are pre- and postoperative under the same protocol. The postoperative CT scan was carried out in about 5 days after the operation with the packing inserted into ethmoidal sinus. The length of bony defect on each section was measured by PACS program and the area of defect was calculated by summing lengths on each section multiplied by the thickness of the section. When the outline of orbit on the slice is drawn manually with a cursor, PACS program measures the area automatically. Orbital volume was calculated from the sum of the area multiplied by the section thickness. Results: The mean dimension of fractured walls was $2.86{\pm}0.99cm^2$. The mean orbital volume of the unaffected orbits was $22.89{\pm}2.15cm^3$ and that of the affected orbits was $25.62{\pm}2.82cm^3$. The mean orbital volume increment of the affected orbits was $2.73{\pm}1.13cm^3$. After surgery, the mean orbital volume of the unaffected orbits was $22.46{\pm}2.73cm^3$ and the mean orbital volume decrease on the surgical side was $2.98{\pm}1.07cm^3$. The estimated correction rate was 118.30%. Conclusion: The orbital volume increment in fractured orbit showed linear correlation with the dimension of fractured area. The orbital volume changes after ethmoidal sinus packing also showed linear correlation with orbital volume increment in fractured orbit. This study showed the regressive linear correlation between the increment of orbital volume and the correction rate. To evaluate the maintenance of reduction state, we think that the further study should be done for comparative analysis of orbital volume change after removal of packing.

• Journal of Korean Public Health Nursing
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• v.14 no.1
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• pp.68-79
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• 2000

In order to provide a desirable direction for the health education on preventing drinking of elementary school students. by understanding the views held by elementary school teachers on drinking prevention education. 529 teachers at elementary schools located in Seoul were responded by constructed questionnaires during the period of Nov. 15 to Dec. 18 1999. The results of the survey analysis were as follows: 1. $84.6\%$ of the respondents said that schools should offer education programs on preventing drinking, and this view was more strongly shared by teachers with religions than non-religious ones. 2. $35.0\%$ of teachers responded that the education should start with 6th graders, while $28.3\%$ opted for 4th to 5th grades. With regard to the appropriate class in providing such education, $41.0\%$ selected physical education (PE), followed by extracurricular activity class with $35.4\%.\; 45.6\%$ of the respondents said discussion would be the most effective education method. while $35.4\%$ recommended using experiments. Growth and developmental defect and fall in diseases were pointed out as the most interesting topic for students by $39.4%$ and $31.2\%$ of the surveyed, respectively. As for the most effective media for education, $56.0\%$ recommended video, followed by cartoons $(21.5\%)$ and computer games $(19.5\%),\;63.7\%$ of the teachers picked school nurses as the most appropriate person in carrying out the education. The results of the finding show that it would be most desirable to provide health education on preventing drinking to senior elementary schoolers during the PE or extracurricular activity class by school nurses. The program would be structured to first show video clips on growth and developmental defect or fall in diseases resulting from drinking and to have discussions or experiments on related matters.

• Child Health Nursing Research
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• v.6 no.3
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• pp.305-315
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• 2000

In order to provide a desirable direction for the health education on preventing smoking of elementary school students, by understanding the views held by elementary school teachers on smoking prevention education, 529 teachers at elementary schools located in Seoul were responded by constructed questionnaires during the period of Nov. 15 to Dec. 18 1999. The results of the survey analysis were as follows: 1. 91.9% of the respondents said that schools should offer education programs on preventing smoking, and this view was more strongly shared by teachers with religions than non-religious ones. 2. 37.6% of teachers responded that the education should start with 4th-5th graders, while 36.0% opted for 6th grades. With regard to the appropriate class in providing such education, 41.1% selected physical education (PE), followed by extracurricular activity class with 28.8%, 45.1% of the respondents said discussion would be the most effective education method, while 39.9% recommended using experiments. fall in diseases and growth and developmental defect were pointed out as the most interesting topic for students by 33.2% and 28.1% of the surveyed, respectively. As for the most effective media for education, 57.2% recommended video, followed by computer games(19.2%) and cartoons (20.0%). 64.1% of the teachers picked school nurses as the most appropriate person in carrying out the education. The results of the finding show that it would be most desirable to provide health education on preventing smoking to senior elementary schoolers during the PE or extracurricular activity class by school nurses. The program would be structured to first show video clips on growth and developmental defect or fall in diseases resulting from smoking and to have discussions or experiments on related matters.

• Journal of Veterinary Clinics
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• v.25 no.6
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• pp.482-487
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• 2008

This study was performed to investigate the ophthalmic findings of the Korean traditional 'Sapsaree' dogs, and to provide ophthalmic references. Five hundred forty-seven Sapsaree dogs were randomly chosen without any criteria preference. Ophthalmic examination was performed bilaterally using ocular equipments, including slit-lamp biomicroscope, tonometer, direct and indirect ophthalmoscope. The obtained data for ophthalmic findings were analysis by the multivariate linear regression model to identify effects of sex, age and hair coat type. For congenital conditions, the incidence of persistent pupillary membrane (PPM) was the most common defect and there was present 8.8 % whereas for acquired ophthalmic diseases, cataract was the most commonly observed (3.7 %) in Sapsaree dog. Other frequent ocular finding included persistent hyaloid vessel remnant (PHVR, 6.2 %) in congenital conditions, and postinflammatory retinal degeneration (PIRD, 3.1 %) and corneal dystrophy (2.4 %) in acquired ophthalmic diseases. Only one significant effect was age of the Sapsaree for PIRD (P=0.040). There are no any significant effect for sex and hair coat types. This study will provide useful guidelines to clinicians and breeders for the basic ophthalmic information on this breed.

• Journal of Korean Society for Quality Management
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• v.48 no.2
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• pp.297-307
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• 2020

Purpose: The purpose of this study is to analyze the factors that affect ammunition performance by applying data mining techniques to the Ammunition Stockpile Reliability Program (ASRP) data of the 155mm propelling charge. Methods: The ASRP data from 1999 to 2017 have been utilized. Logistic regression and decision tree analysis were used to investigate the factors that affect performance of ammunition. The performance evaluation of each model was conducted through comparison with an artificial neural networks(ANN) model. Results: The results of this study are as follows; logistic regression and the decision tree analysis showed that major defect rate of visual inspection is the most significant factor. Also, muzzle velocity by base charge and muzzle velocity by increment charge are also among the significant factors affecting the performance of 155mm propelling charge. To validate the logistic regression and decision tree models, their classification accuracies have been compared with the results of an ANN model. The results indicate that the logistic regression and decision tree models show sufficient performance which conforms the validity of the models. Conclusion: The main contribution of this paper is that, to our best knowledge, it is the first attempt at identifying the significant factors of ASPR data by using data mining techniques. The approaches suggested in the paper could also be extended to other types ammunition data.