• 한국정보통신설비학회:학술대회논문집
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• 2006.08a
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• pp.145-150
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• 2006

For most of the measuring methods of traditional control theory, measuring equipments are located at the output of the system to measure quantities transformed from non-electrical form into electrical one. This method helps us to define the value of parameters to be measured, but it has limitation because it can only assess the efficiency of a movement process. That means we can not understand the inner kinetics which is the essence of the system. In the modern control theory, states of system are considered as the feedback to the control process, which helps us to assess the elements in the inside of the system. In this paper, we survey methods for estimating states being not exposed to the correct measurements. Using this method, we also suggest an application for giving an estimate of the traffic on the LSPs to adapt the network configuration for changing traffic conditions.

• Journal of Home Health Care Nursing
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• v.15 no.2
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• pp.106-114
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• 2008

Purpose: We analyzed the self-care behavior and metabolic control rates in diabetic patients based on the National Health and Nutrition Examination Survey in Korea (2005). Methods: The study group included 311 patients who were over 126 mg/dL on the FBS test. Data were analyzed using SPSS PC WIN 12.0. Results: The average score of self-care behavior was $12.08{\pm}1.05$ points, and significantly different according to DM treatment status, disease duration (years), admission experiences (within 1 year) and education about DM. Glucose, total cholesterol, triglycerides were decreased in self care subjects, but not significantly. Conclusion: An educational program for diabetic patients would help maintain metabolic control rates to improve self-care behavior.

• Korean Journal of English Language and Linguistics
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• v.2 no.2
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• pp.249-277
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• 2002

The purpose of this paper is to show that Web-Based English Instruction (WBEI) focused on writing is effective in learning English in Korea. To investigate the effectiveness of WBEI, a survey was conducted to the experimental group after WBEI and a test was taken to compare the difference of the score of the experimental group and control group. According to the survey, almost all students thought that WBEI was a most effective way to improve communicative competence by exchanging electronic mails with native speakers. The test showed that the experimental group's score was somewhat low in comparison with the control group's in pre-test, but the former groups' was rather higher than the control groups' in post-test. This study also suggests that we should develop more effective Web-based English teaching-learning methods to activate WBEI in our classroom.

• Asian Journal of Turfgrass Science
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• v.10 no.3
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• pp.177-186
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• 1996

The effects of salt are studied on control of weeds and growth of Korean turfgrass(Zoysia japon-ica Steud.). And the mobility of salt were determined in a lawn field. At post-emergence stage, the growth of the 13 weeds such as Trifolium repens, Erigeron canadensis, Artemisia prieceps, Equi-setum arvense, etc were controlled by treatment of salt and salt water, Pea-annua and Equisetum arvense were tolerant to salt compared with the other 11 weeds. At pre-emergence stage, the salt controlled the germination of the weeds in soil. 300~500 kg /10a salt and 20~30 % salt waterwere enough for the control of weeds, However, salt water injuried the lawngrass except the dormancy stage. The mobility of salt in soil was increased by rainfall. After 160mm of rainfall, the salinity in the soil treated with salt 500kg /l0a was below 0.3 ms/cm in surface soil and about 0.1 ms /cm in soil 30 cm depth. Key words: Soil environmental survey, Korean turfgrass, Salt, Salt water.

• Journal of Electrical Engineering and Technology
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• v.5 no.1
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• pp.79-102
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• 2010

This paper presents exhaustive review of various methods/techniques for coordinated control between FACTS controllers in multi-machine power systems. It also reviews various techniques/methods for optimal choice and allocation of FACTS controllers. Authors strongly believe that this survey article will be very much useful to the researchers for finding out the relevant references in the field of placement and coordination of FACTS Controllers.

• International Journal of Advanced Culture Technology
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• v.10 no.2
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• pp.162-173
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• 2022

In non-face-to-face teaching-learning, a survey was conducted on 55 students in the department of chemistry education at university A on the variables (behavioral control, instructor-learner interaction, cognitive learning) affecting learning satisfaction and academic achievement. There were relatively large positive correlations between variables. The positive correlation between them was found to be the factors that influenced learning satisfaction and academic achievement in non-face-to-face teaching-learning. The average values of non-face-to-face teaching-learning for each variable were lower than the corresponding values of face-to-face teaching-learning, respectively. As a result of the perception survey on the detailed factors of each variable, negative responses were relatively high in factors such as 'concentration of behavior' in behavioral control, 'level-considered explanation' in instructor-learner interaction, and 'knowledge understanding' in cognitive learning.

• Journal of the Korean Society of Industry Convergence
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• v.26 no.4_2
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• pp.687-696
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• 2023

In recent construction sites, digital maps obtained through drone photogrammetry have garnered increasing attention as indispensable tools for effective construction site management. the strategic placement of Ground Control Points (GCPs) is crucial in drone photogrammetry. Nevertheless, the manual labor and time-intensive nature of GCP surveying pose significant challenges. The purpose of this study is to design the concept of automated GCPs survey technology for enhancing drone photogrammetry efficiency in construction sites. As a result, the productivity of the automated method was analyzed as 118,894.7㎡/hr. It is over 25% productivity improvement compared to traditional methods. In future studies, economic analysis of automated methods should be studied.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.169-170
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• 2022

In this study, in order to select the element items for risk assessment for autonomous ships, a survey was conducted on the maritime traffic control workers and the risk assessment element items were analyzed. The top five element items for risk assessment were identified, and the detailed value of risk elements according to the size of the vessel could be confirmed.

• Journal of Korean society of Dental Hygiene
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• v.16 no.4
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• pp.517-523
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• 2016

Objectives: The purpose of the study is to investigate the uniform management of the dental hygienists in Korea. Methods: The study was carried out by direct telephone survey to dental gygienists in Gangneung, Wonju, and Seongnam from March 15 to April 10, 2015. The subjects were seventy dental clinics by random sampling. The questionnaire consisted of general characteristics of the subjects(4 items), infection control education(3 items), and infection control activity(9 items). Cronbach's alpha was 0.781 in the study. After informed consent from the dental hygienists, the survey was done by telephone. Data were analyzed by SPSS 21.0 program. Results: The dental hygienists taking infection control education tended to wash the uniforms twice a week (${\chi}^2$=15.95, p<001). The majority of the dental hygienists thought that the best washing place of uniform would be dental clinics than any other place (${\chi}^2$=38.76, p<001). Conclusions: It is very important to implement the infection control education for the dental hygienists. The establishment of standard guideline for infection control of the uniform washing will enhance the dental service quality and satisfaction of the dental service consumers.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.8 no.2
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• pp.23-29
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• 1990

Non-metric camera is more profitable than metric camera for geometric analysis of small and elaborate structures, because focal length control of non-metric camera is flexible while generally metric camera has limited focal length. And if the problem of conventional method requiring much time and endeavor to measure three dimensional positions of control points will be solved effectively, it is possible to analyze very close-range photogrammetry more easily and quickly. The purposes of this study are to propose the efficiency of non-metric camera and to reduce difficulty of control survey sharply by introducing self-control survey method. For these, very close-range photographs of the small object were obtained by using non-metric camera calibrated for systematic errors and then bundle adjustment is used for analysis procedure. As a result, the superiority of non-metric camera in analyzing very close-range photographs and the application proptriety of self-control survey were proved, therefore it is expected to be able to apply to precise analysis of small structures or spearhead parts.