• Journal of the Korean Institute of Telematics and Electronics B
• /
• v.32B no.5
• /
• pp.777-787
• /
• 1995

This paper presents a new method for automatically calibrating robot link (Kinematic) parameters during the process of estimating motion parameters of a moving object. The motion estimation is performed based on stereo cameras mounted on the end-effector of a robot manipulator. This approach significantly differs from other calibration approaches in that the calibration is achieved by simply observing the motion of the moving object (without resorting to any other external calibrating tools) at numerous and widely varying joint-angle configurations. A differential error model, which expresses the measurement errors of a robot in terms of robot link parameter errors and motion parameters, is developed. And then a measurement equation representing the true measurement values is derived. By estimating the above two kinds of parameters minimizing the difference between the measurement equations and the true moving pattern, the calibration of the robot link parameters and the estimation of the motion parameters are accomplished at the same time.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.683-684
• /
• 2008

The resistance is frequency dependent by the Seeback effect, loading effect, Eddy current loss, uniformly distributed inductance of the resistance element and uniformly distributed self-capacitance of the resistance element and capacitance between resistance element and it's box. A precise ac resistance measurement system has been developed for using as maintaining and dissemination of national ac resistance standards. The developed resistance measurement system can be used as a instrument of national ac resistance standards at frequency less than 10 kHz and it's measurement accuracy was 0.23(${\mu}{\Omega}/{\Omega}$)+4.2 ${\mu}{\Omega}$ at 1592 Hz and 20 V.

• Journal of the Korean Operations Research and Management Science Society
• /
• v.37 no.2
• /
• pp.1-16
• /
• 2012

NCW(Network Centric Warfare) offers BSEs(Battelspace-Entities) the capabilities of sharing information through C4ISRCommand, Control, Communications, Computers and Intelligence, Surveillance and Reconnaissance) network and it also improves their combat powers based on information superiority with awareness of common situation in battlefield and self-synchronization. Although the concept of NCW was developed at the end of 1990 and there have been various studies for NCW from the development of its concept, the effort for measuring the synergistic effect of NCW is insufficient at the present time. Therefore, in this paper we reviewed literatures concerning the effectiveness measurement of NCW. The category of our survey is network effect, metrics, simulation, battlefield information, social network analysis and mathematical model. The main purpose of this study is to suggest future researchers a research direction by analyzing the aspects and limitations of existing studies about the quantitative measurement of NCW.

• Journal of Industrial Technology
• /
• v.27 no.B
• /
• pp.125-128
• /
• 2007

This paper presents Spectral-Domain optical measurement system using self-fabricated CCD sensor driver. The light source is a high brightness white LED and the detector is a 2048 array typed CCD image sensor. I have fabricated the CCD sensor driver to generate four pulse signals, which are the CCD-driving pulses. Using this Spectral Domain optical measurement system, the distance value between the reference mirror and the sample mirror can be obtained successfully.

• The KIPS Transactions:PartC
• /
• v.11C no.5
• /
• pp.621-632
• /
• 2004

Recent measurement studies of real teletraffic data in modern telecommunication networks have shown that self-similar (or fractal) processes may provide better models of teletraffic in modern telecommunication networks than Poisson processes. If this is not taken into account, it can lead to inaccurate conclusions about performance of telecommunication networks. Thus, an important requirement for conducting simulation studies of telecommunication networks is the ability to generate long synthetic stochastic self-similar sequences. A new generator of pseu-do-random self-similar sequences, based on the fractional Gaussian nois and a wavelet transform, is proposed and analysed in this paper. Specifically, this generator uses Daubechies wavelets. The motivation behind this selection of wavelets is that Daubechies wavelets lead to more accurate results by better matching the self-similar structure of long range dependent processes, than other types of wavelets. The statistical accuracy and time required to produce sequences of a given (long) length are experimentally studied. This generator shows a high level of accuracy of the output data (in the sense of the Hurst parameter) and is fast. Its theoretical algorithmic complexity is 0(n).

• Journal of the Korean Society of Clothing and Textiles
• /
• v.29 no.3_4 s.141
• /
• pp.391-402
• /
• 2005

Tile purposes of this study were to find out any significant relations among body image, needs for body modification, self concept, and some selected clothing behaviors of two age group females using social comparison theory as the research background. The sampling method was a convenient sampling, and the subjects were 56 females aged from 20 to 24 years and 54 females aged from 40 to 49 years. The quasi-experiment and survey were conducted from May 1 to June 30, 2002. The results of tile study were as follows. First, the perceptual body image is more important than measured body size and ideal body size in body image. Apart from measurement instrument, people who perceived slim had higher self concept, exhibition and conformity of clothing. Second, there were significant differences between the two age groups(twenties and forties) in needs for plastic modification, self concepts and clothing behaviors. The younger age group exhibited higher need for modification than the older age group and the younger group also showed higher self concept, higher interests in clothing and fashion, more exhibition tendency and conformity to clothing.

• Journal of Korean Academy of Fundamentals of Nursing
• /
• v.23 no.4
• /
• pp.411-418
• /
• 2016

Purpose: The purposes of this study were to identify nursing students' levels of anxiety in simulation based nursing education and to understand the relationship of anxiety and personal satisfaction of simulation, self-efficacy, and clinical competence during simulation. Methods: This study was a descriptive study with 84 senior nursing students at a private university in South Korea. Level of anxiety was measured with STAI (the State- Trait Anxiety Inventory) prior to the stimulation practice. After the debriefing, satisfaction scores were measured with SSE (Satisfaction with Simulation Experience scale), self-efficacy scores with the modified measurement developed by Roh and Park, and scores for clinical skills with a scale developed by the Korea Association of Cardiopulmonary Resuscitation. Results: Nursing students exhibited moderate to severe anxiety in simulation practice (Mean 49.51, SD 8.60). Self-efficacy was negatively correlated to anxiety (r=-.25, p=.022). Conclusion: Decreasing students' anxiety levels needs to be addressed to increase the self-efficacy of the simulation practice.

• Research in Community and Public Health Nursing
• /
• v.24 no.2
• /
• pp.135-142
• /
• 2013

Purpose: The purpose of this study is to explore influencing factors which contribute to the suicidal ideation in community residents who have ever experienced suicidal attempts. Methods: The subjects of this study were a total of 165 local residents with some experiences of suicidal attempts in B City and K Province. The data were collected from May 1st to October 30th, 2012 and self-report questionnaires including Suicidal Ideation Inventory, Self-Esteem Inventory, Depression, Family and Social Support Inventory were used as a measurement tool. The data were analyzed using t-test, ANOVA, Pearson correlation coefficients, multiple regression with the SPSS/WIN 18.0 program. Results: The average score of suicidal ideation in the local residents with experiences of suicidal attempts was $12.7{\pm}6.25$. Predicted factors on suicidal ideation in the local residents with experiences of suicide attempts included self-esteem, depression and physical illness, and the suicidal ideation has a variance explanation power of 54%. Conclusion: The development and application of intervention programs, which can help to increase self-esteem levels and decrease depression levels among community residents with experiences of suicidal attempts, are first needed. Furthermore, nursing services of customized self-management for people with physical disabilities are needed on the basis of their own physical problems.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.8
• /
• pp.3486-3491
• /
• 2011

This study aims to identify the effect of neurofeedback training by observing the pre and post brainwave measurement results of about 60(experimental group 30, control group 30) subjects who have shown self directed learning ability. The study took place at neuro-training center B, in between the months of Jan. 2010 and Jul. 2010. As the brainwaves are adjusted by timeseries linear analysis. The result confirmed the differences of both self regulation quotient, training protocol, and questionnaire. The result of the study suggest neurofeedback technique's possibility in positively affecting the subjects' self directed learning ability.

• Journal of Korea Game Society
• /
• v.8 no.2
• /
• pp.97-105
• /
• 2008

This research investigates on relationships between game experience and its positive effects by using social self-efficacy measurement. When playing MMORPG, game users communicate with each other and go through various social experiences. Thus, online game offer a virtual place where we can have social interactions and it eventually expands our daily life. In this study, we used regression analysis to explore how online game experiences influence social self-efficacy. The results indicated that a group with higher frequency game use presented higher social self-efficacy. We suggest future researches and discussions focusing on the positive effects of game use rather than negative issues and game restrictions.