• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.494-497
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• 2012

Black marker cause unnatural problems between the existing various contents and marker. To solve this problem, we tested the various colors and color placement according to frequency of 3D objects. Based on this, infant's learning content system based NyARToolkit for the mobile-based augmented reality was implemented. We are solved the unnatural problems by insert to color marker in the Implemented system. and infant can study seamlessly because concentration increases by the familiar character on the markers.

• English Language & Literature Teaching
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• v.11 no.4
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• pp.365-389
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• 2005

The purpose of this study is to present the task model that is the most effective in English language methodology based on the investigation of task-based performance in Korean EFL classroom practice. The subjects were 538 high school students and 126 high school teachers, each of whom had common experiences using the materials of task-based activities for more than one year. To analyze the data, the program SPSS WIN 11.0 including frequency distribution and chi-square analysis was used. The results of the questionnaire analysis showed that both teachers and students had a comparatively high level of satisfaction in task rationale, but that they had some mixed responses in the fields of input data, settings, and activity types. To conclude, a few suggestions are made to provide some meaningful considerations for the EFL teachers and material developers: a) task goals and rationale that encourage the learner's positive motivation; b) authenticity of input data based on the real-world context; c) collaborative learning environment that enhances communicative interaction; d) proportional representation of the creative problem-solving activities related to discussions and decision-making processes; e) systematic introduction of integrated language skills. It also suggests that the multi-lateral task model, which has some positive assets compared to previous task models, be newly introduced and applied to the second language learning classrooms.

• ETRI Journal
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• v.30 no.1
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• pp.89-100
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• 2008

We consider the feature recombination technique in a multiband approach to speaker identification and verification. To overcome the ineffectiveness of conventional feature recombination in broadband noisy environments, we propose a new subband feature recombination which uses subband likelihoods and a subband reliable-feature selection technique with an adaptive noise model. In the decision step of speaker recognition, a few very low unreliable feature likelihood scores can cause a speaker recognition system to make an incorrect decision. To overcome this problem, reliable-feature selection adjusts the likelihood scores of an unreliable feature by comparison with those of an adaptive noise model, which is estimated by the maximum a posteriori adaptation technique using noise features directly obtained from noisy test speech. To evaluate the effectiveness of the proposed methods in noisy environments, we use the TIMIT database and the NTIMIT database, which is the corresponding telephone version of TIMIT database. The proposed subband feature recombination with subband reliable-feature selection achieves better performance than the conventional feature recombination system with reliable-feature selection.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.1958-1961
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• 2004

Ring Laser Gyroscopes used as navigational sensors inherently experience a lock-in region, where very low rotational rates are not measurable. Most RLG manufacturers use a mechanical dither motor that applies a small oscillatory rotational motion larger than this region to resolve this problem. Any input acceleration that bends this dithering axis causes flexure error, which is a noncommutative error that can not be compensated by simply using integrated gyro sensor output. This paper introduces noncommutative error equations that define attitude errors caused by flexure errors. In this paper, flexure error is classified as sensor level error if the sensing axis coincides with the dithering axis and as system level error if the two axes do not coincide. The relationship between gyro output and the rotation vector is introduced and is used to define the coordinate transformation matrix and angular motion. Equations are derived for both sensor level and system level flexure error analysis. These equations show that RLG based INS attitude error caused by flexure is directly proportional to time, amount of input acceleration and the dynamic frequency of the vehicle.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.1680-1683
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• 2003

To describe the performance of an antenna, some parameters are necessary. Some of the parameters are interrelate and not all of them must be specified for complete description of antenna performance. The parameters in characteristics of printed antenna for this analysis are radiation pattern, input impedance, VSWR, S parameter and electromagnetic field. In this paper we will consider two shaped of slot antennas one is triangular slot antenna and other is L - shape slot antenna for compare the radiation pattern, return loss, and VSWR. Two slot antennas are designed to have a resonant frequency at 10 GHz. The microstrip line is designed to be 50 ohms in order to match the measurement system, it has the substrate of the thickness = 1.52 mm and dielectric constant (${\varepsilon}_r$) 2.17. The problem space in the FDTD analysis are $60{\times}123{\times}100$ cells for L-shape slot antenna and $50{\times}171{\times}120$ cells for triangular slot antenna with the cell dimensions ${\Delta}x=0.152\;mm.$, ${\Delta}y={\Delta}z=0.15\;mm.$

• Journal of Distribution Science
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• v.15 no.10
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• pp.65-80
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• 2017

Purpose - The purpose of the present study is to discover success factors for small and medium-sized exporting enterprises and to derive factors that can positively influence the export of small and medium-sized enterprises. The ultimate goal is to contribute to the problem solution mentioned above. Research design, data, and methodology - A total of 258 filled-in questionnaires were collected; afterwards, frequency and cross tabulation analyses were conducted. The PPML analytic technique was applied to the core factors analyzed in Stages 1 and 2 to conduct regression analysis (cause and effect analysis and estimation method), thereby deriving success factors. Result - Based on detailed factors, a total of 15 success factors directly/indirectly involved in the success of export in small and medium-sized enterprises comprising 9 success factors, three positive effect factors for export, and three governments support policy factors were identified. Conclusions - The present paper is a rare empirical study paper that found and presented three detailed factors that positively influence on export and three government support policy factors, in addition to the above factors. Therefore, the results can be used by small and medium-sized enterprises that require not only previous studies, but also actual export success factor.

• Structural Engineering and Mechanics
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• v.73 no.3
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• pp.319-330
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• 2020

This paper investigates the free vibrations of cylindrical shells made of time-dependent materials for different viscoelastic models under various boundary conditions. During the extraction of equations, the displacement field is estimated through the first-order shear deformation theory taking into account the transverse normal strain effect. The constitutive equations follow Hooke's Law, and the kinematic relations are linear. The assumption of axisymmetric is included in the problem. The governing equations of thick viscoelastic cylindrical shell are determined for Maxwell, Kelvin-Voigt and the first and second types of Zener's models based on Hamilton's principle. The motion equations involve four coupled partial differential equations and an analytical method based on the elementary theory of differential equations is used for its solution. Relying on the results, the natural frequencies and mode shapes of viscoelastic shells are identified. Conducting a parametric study, we examine the effects of geometric and mechanical properties and boundary conditions, as well as the effect of transverse normal strain on natural frequencies. The results in this paper are compared against the results obtained from the finite elements analysis. The results suggest that solutions achieved from the two methods are ideally consistent in a special range.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.20 no.3
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• pp.201-206
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• 1998

We reviewed 240 patients with facial bone fractures treated at the department of oral and maxillofacial surgery between Jan. 1. 1997 to Dec. 31. 1997. These results were obtained as follows : 1. The ratio of men to women was 3.5 : 1 2. The age frequency was highest for people in their 20's 34.2%, in their 10's 21.63%, and in their 30's 20.41%. 3. The fractures were at the highest incidence in September at 13.3%, followed by in May at 11.25%. 4. The frequent causes were traffic accidents 47.9%, fisticuffs 20%, accidents caused by falling or slipping 16.25%, working traumas 8.75%, and sports 7.1%. 5. The most common location of facial bone fractures was the mandible 67.2%. The frequent fracture sites of the mandible were symphysis, angle, condyle, and body in the order. 6. The associated injuries of facial bone fractures were neurosurgry, orthopedic surgery, cardiothoracic surgery, ophthalmic surgery and general surgery. 7. In respect of treatment, open reduction used 84.3% of the time. 8. Post operation complicatins were as follows : neurological problem 2.08%, malunion 1.67%, facial asymetry 0.83%, malocclusion 0.83%, and infection 0.41%.

• Journal of Korean Academy of Nursing Administration
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• v.7 no.1
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• pp.111-126
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• 2001

The purpose of this study is to provide a basic data by evaluation the problems about nursing information system and identifying the need of improvement of it. Data were collected from April 6 to 15, 2000 through questionnaires taken by 218 nurses working in a general hospital using nursing information systems. The two structured questionnaires were used for the collecting the data. The data obtained were analyzed by using frequency, percentage, mean, standard deviation, t-test, one-way ANOVA, Pearson's correlation coefficients, and Cronbach's alpha coeffcients. The results are as follows: 1. In the problem of nursing information system, ${\lceil}$There are no appropriate programs for independent nursing information systems because there are no nurse informatists in the information department${\rfloor}$ scored highest. Also, ${\lceil}$There is a lack of manual for operation of the nursing information system${\rfloor}$, ${\lceil}$There is difficulty getting help when the system is in trouble${\rfloor}$, ${\lceil}$General information about using computers and managing problems are lacking${\rfloor}$, ${\lceil}$Unsatisfactory matters about the nursing information systems are not improved quickly.${\rfloor}$ received high scores. 2. In the need for improvement of the nursing information system, ${\lceil}$Nursing education and research${\rfloor}$ was the highest area of the system. 3. The problems of the nursing information system showed high positive correlation with the need for improvement of the system(p=.00).

• Journal of Korean Academy of Nursing
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• v.34 no.6
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• pp.1025-1034
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• 2004

Purpose: This study defines a vulnerable group in a community that has become the main target of a national health project also, it is descriptive research to suggest an evidence-based direction to meet their deficit health-related needs, Method: This research examined 833 families and 1,835 family members of the financially vulnerable class that was registered in a home visiting program of a public health center. Among them, 892 persons who had health problems, and their family members were examined in detail to find out their characteristics of vulnerability and health needs by assessment during a nurses home visit. Frequency distribution, stepwise-regression and factor analysis were used to analyze the data. Result: The vulnerable group that was defined with social indexes set as standards, involved substantial characteristics of vulnerability. The characteristics of demand showed tendencies of being clustered in 5 factors needs of intensive nursing care, chronic nursing care problems and helplessness, maintenance of family functioning with a disability, deficient problem solving ability, and simple financial fragility. Conclusion: Categorization of needs is an evidence-based estimator of workload in nurse home visiting services, and can be used as a basic resource for direction to meet the deficit needs of a vulnerable group.