• 한국작물학회지
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• 제28권3호
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• pp.310-318
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• 1983

본 시험은 식생분석법(vegetation analysis)에 많이 이용되는 4가지 분석방법 즉, List quadrat 방법, Clip quadrat방법, Point quadrat방법, Line intercept방법을 비교 분석하였다. 1. 분석 방법별로 얻어지는 초종수에 있어서는 List quadrat방법이 14종으로 가장 많았고, Line intercept방법이 8종으로 가장 적었다. 한편 Clip quadrat방법과 Point quadrat방법은 다같이 12종씩 기록되었다. 2. Clip quadrat방법은 여뀌바늘(Ludwigia prostrata Roxb), 벗풀(Sagittaria trifolia L.)등과 같이 수분함량이 비교적 적은 초종에 대해서는 지나치게 높은 우점도(Importance value)를 보이는 경향이며 반면 올미(Sagittaria Pygmaea Miq.) 또는 물달개비〔Monochoria vaginalis(Burm. f)〕와 같은 수분함량이 높은 초종에 대해서는 지나치게 낮게 우점도를 나타내는 경향이었다. 한편 Line intercept 방법은 벗풀(S. trifolia)와 가래(Potamogeton distinctus Benn.)등과 같이 넓은 잎을 가진 초종에 대해 높은 우점도를 나타내는 경향이었다. 3. 본 시험에 사용된 4가지 방법중에서 어느 방법을 선택하더라도 별다른 큰 문제점을 야기 시키지는 않았으나 작업과정중의 노력절감, 시간절약 또는 우점초종의 초종수 및 우점순위 등을 종합적으로 볼 때 Point quadrat방법이 가장 바람직하였고, Line intercept방법이 가장 바람직하지 못하였다.

• 가족자원경영과 정책
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• 제18권3호
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• pp.103-116
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• 2014

The purpose of this study is to examine the influence of family mealtime on the childrens' school adaptation. This study uses data from the 2012 Survey on Child Education and School Involvement of Parents by the Center for Family-School Partnership Policy Research at Seoul National University. Survey data was collected from 1500 parents with school-aged children. For the data analysis, Chi sqaure test and hierarchical linear regression analyses were conducted. The results of these analyses showed that the numbers of family meals shared averaged 4.26 times per week for breakfast and 4.33 times per week for dinner. There were significant differences in the number of family meals shared together according to school level, residence area, and parent employment status, and household income. In addition, childrens' school adaptation was significantly different depending on school level, parent gender, parent education, and parent employment status. Finally, according to the hierarchical regression analyses, the number of family meals shared significantly predicted childrens' school adaptation. The greater number of family meals shared, the stronger the childrens' school adaptation. These results indicate that family mealtime has a positive effect on childrens' school adaptation. This study suggests that family mealtime is an indicator of family strength and it needs to guarantee family shared time at least to have a dinner together. This study could provide grounds for making family policy and education policy in order to guarantee family shared time.

• 산업경영시스템학회지
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• 제37권4호
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• pp.35-41
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• 2014

Real-life time series characteristic data has significant amount of non-stationary components, especially periodic components in nature. Extracting such components has required many ad-hoc techniques with external parameters set by users in a case-by-case manner. In this study, we used Empirical Mode Decomposition Method from Hilbert-Huang Transform to extract them in a systematic manner with least number of ad-hoc parameters set by users. After the periodic components are removed, the remaining time-series data can be analyzed with traditional methods such as ARIMA model. Then we suggest a different way of setting control chart limits for characteristic data with periodic components in addition to ARIMA components.

• 보건행정학회지
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• 제27권4호
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• pp.315-323
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• 2017

Background: This study was purposed to analyze the effect of spatial accessibility to the psychiatry department in general hospital on the outpatient visit of mental patients. Methods: Data was provided from the Statistics Korea and Statistical Geographic Information Service, National Health Insurance Service, Health Insurance Review and Assessment Service, and Korea Transport Institute in 2015. The study regions were 103 administrative regions such as Si and Gu. The 103 regions had at least one general hospitals with a psychiatry department. The number of outpatient visit of mental patients in regions was used as the dependent variable. Spatial accessibility to mental general hospital was used as the independent variable. Control variables included such as demographic, economic, and health medical factors. This study used network analysis and multi-variate regression analysis. Network analysis by ArcGIS ver. 10.0 (ESRI, Redlands, CA, USA) was used to evaluate the average travel time and travel distance in Korea. Multi-variate regression analysis was conducted by SAS ver. 9.4 (SAS Institute Inc., Cary, NC, USA). Results: Travel distance and time had significant effects on the number of outpatient visits in mental patients in general hospital. Average travel time and travel distance had negative effects on the number of visits. Variables such as (number of total population, percentage of aged population over 65, and number of mental general hospital) had significant effects on the number of visit in mental patients. Conclusion: Health policy makers will need to consider the spatial accessibility to the mental healthcare organization in conducting regional health planning.

• International Journal of CAD/CAM
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• 제3권1_2호
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• pp.31-40
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• 2003

In this paper, first order slice height calculation in Laminated Object Manufacturing (LOM) of free form surfaces is done with two different considerations: that a) the cutter trajectory is oriented in the direction of local absolute maximum more in number when compared to the case where the cutter trajectory is contained in the normal vertical section (NVS). However, it would help in achieving higher form accuracy of the final part because it would be a form of worst-case check. For the second proposed strategy, least number of slices results, thereby reducing overall build time drastically.

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 2008년도 추계학술발표회 발표논문집
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• pp.282-285
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• 2008

At least 15% of the C polykrikoides cells that precipitated to the bottom layer either by the addition of loess or no addition survived for 1 week at all growth phases, rather than disappearing immediately after precipitating. However, no live cells were observed after 20 days, regardless of phase or loess addition. In the exponential phase, the number of C polykrikoides cells increased to >2886 cells/ml after loess was added. However, in the stationary phase, the number of cells did not increase until 18 days. In the exponential phase, those C polykrikoides that survived precipitation caused by scattering loess on cultures did not appear to have the ability to cause red tides again because of the short red tide periods in the field, long lag time after loess addition, and low survival rate after loess addition.

• The Plant Pathology Journal
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• 제32권6호
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• pp.500-507
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• 2016

Single-molecule real-time (SMRT) sequencing allows identification of methylated DNA bases and methylation patterns/motifs at the genome level. Using SMRT sequencing, diverse bacterial methylomes including those of Helicobacter pylori, Lactobacillus spp., and Escherichia coli have been determined, and previously unreported DNA methylation motifs have been identified. However, the methylomes of Xanthomonas species, which belong to the most important plant pathogenic bacterial genus, have not been documented. Here, we report the methylomes of Xanthomonas axonopodis pv. glycines (Xag) strain 8ra and X. campestris pv. vesicatoria (Xcv) strain 85-10. We identified $N^6$-methyladenine (6mA) and $N^4$-methylcytosine (4mC) modification in both genomes. In addition, we assigned putative DNA methylation motifs including previously unreported methylation motifs via REBASE and MotifMaker, and compared methylation patterns in both species. Although Xag and Xcv belong to the same genus, their methylation patterns were dramatically different. The number of 4mC DNA bases in Xag (66,682) was significantly higher (29 fold) than in Xcv (2,321). In contrast, the number of 6mA DNA bases (4,147) in Xag was comparable to the number in Xcv (5,491). Strikingly, there were no common or shared motifs in the 10 most frequently methylated motifs of both strains, indicating they possess unique species- or strain-specific methylation motifs. Among the 20 most frequent motifs from both strains, for 9 motifs at least 1% of the methylated bases were located in putative promoter regions. Methylome analysis by SMRT sequencing technology is the first step toward understanding the biology and functions of DNA methylation in this genus.

• International Journal of Internet, Broadcasting and Communication
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• 제9권2호
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• pp.20-26
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• 2017

Process control is crucial in many industries, especially in semiconductor manufacturing. In such large-volume multistage manufacturing systems, a product has to go through a very large number of processing steps with reentrant) before being completed. This manufacturing system has many machines of different types for processing a high mix of products. Each process step has specific quality standards and most of them have nonlinear dynamics due to physical and/or chemical reactions. Moreover, many of the processing steps suffer from drift or disturbance. To assure high stability and yield, on-line quality monitoring of the wafers is required. In this paper we develop a real-time fault detection system on semiconductor manufacturing process. Proposed system is superior to other incremental fault detection system and shows similar performance compared to batch way.

• Earthquakes and Structures
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• 제17권6호
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• pp.623-633
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• 2019

A large number of available concrete buildings designed only considering gravity load that require seismic rehabilitation because of failure to meet plasticity criteria. Using steel bracings are a common type of seismic rehabilitation. The eccentric bracings with vertical link reduce non-elastic deformation imposed on concrete members as well as elimination of probable buckling problems of bracings. In this study, three concrete frames of 10, 15, and 20 stories designed only for gravity load have been considered for seismic improvement using performance-based plastic design. Afterwards, nonlinear time series analysis was employed to evaluate seismic behavior of the models in two modes including before and after rehabilitation. The results revealed that shear link can yield desirable performance with the least time, cost and number of bracings of concrete frames. Also, it was found that the seismic rehabilitation can reduce maximum relative displacement in the middle stories about 40 to 80 percent. Generally, findings of this study demonstrated that the eccentric bracing with vertical link can be employed as a suitable proxy to achieve better seismic performance for existing high rise concrete frames.

• 한국보건간호학회지
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• 제24권1호
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• pp.61-70
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• 2010

Purpose: This study analyzed outcomes of a Telecare case management service pilot project for Korean Medicaid Program Clients in Seoul. Outcome data for provided services and medical aid cost data were analyzed. Methods: Case management services were delivered by 10 medical aid managers. The period of the project was from July to December 2007. Results: The total number of the objects was 9714, representing 43.4% of the total medical aid clients in the area. The average number of consults was 2.58. Consults were most frequently via letter and telephone, with in- person visits being least common. Of the total, 213 cases were referred to community services, 87.8% were transacted successfully. The medical expenditure was less than that from January-June, 2007. Conclusion: Telecare service via mail or telephone allows contact with many clients in a short time which can enable the discover and monitoring of high risk clients. This can be accomplished at a cost savings to the Korean Medicaid Program.