• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.29 no.7
• /
• pp.38-46
• /
• 2015

This paper propose a variable parameter estimations for variable over current load of five-phase squirrel-cage induction motor(IM) to servo control system. In order to high performance control of AC motor using a field oriented control(FOC) and direct torque control(DTC) algorithm, there are required precise motor parameters for slip calculation, flux observer, controller gain, torque command of current components, rotor position, speed estimation, and so on. We are suggest a analyzed estimation results of the motor parameters that developing five-phase squirrel-cage IM have a stator of concentrated winding for experimental within variable over current load at rated input frequency. There are results of stator winding measurement, no-load test, locked-rotor test, variable over current load test, and estimated parameters of equivalent circuits using manufactured experimental apparatus by IEEE Standard Test Procedure for Polyphase Induction Motors and Generators 112-2004.

• Communications for Statistical Applications and Methods
• /
• v.6 no.1
• /
• pp.151-158
• /
• 1999

Distribution-free tests are proposed for AB/BA 2*2 cross-over design data based on placements introduced by Orban and Wolfe(1992). In this paper we suggest the homogeneity test or carry-over effects and also suggest the test for direct effects and the test for period effects under the same carry-over effects. The properties such as iterative asymptotic distribution for the proposed tests are discussed.

• Economic and Environmental Geology
• /
• v.39 no.3 s.178
• /
• pp.229-234
• /
• 2006

Cross-over errors (XOEs) may mislead scientists when interpreting marine geophysical data. Such risk can be reduced by correcting the data proportionally between two cross-over points (XOPs). C program is presented to determine XOPs using a quick rejection test and a straddle test, and to adjust XOEs using a weighted linear interpolation algorithm.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2003.11a
• /
• pp.615-618
• /
• 2003

To investigate the electrical fire identification due to conductor structure analysis of an electrical wire, we are studied by temperature heating test, over current test, short test and electric molten marks. And metal structure analysis of wire by short, we are found out increase in crystal grain with heating temperature. Structure of specimen at over current 300[%] occurred hardly structure formation and boundary of grain.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
• /
• v.4 no.3
• /
• pp.245-253
• /
• 2006

A test of the 1/3 scale model was conducted to verify the tip-over analysis of a dry. concrete storage cask under a hypothetical accident condition. The tip-over analysis was executed using the velocity at each point as the initial conditions of the model just before the impact. The initial velocity was determined from the initial angular velocity, which would make the equivalent kinetic energy to the potential energy. To confirm the structural integrity of the canister, the visual testing and the non-detective testings such as Liquid Penetrant testing and Ultrasonic Testing were conducted. The lid of a storage cask was plastically deformed near the impact point. The structural integrity of storage cask was maintained. To verify the tip-over analysis the strains and the accelerations acquired by the tip-over test were compared with those by the analyses. The results of the analysis were larger than the test results about two times.

• Journal of the Korean Geotechnical Society
• /
• v.20 no.8
• /
• pp.113-121
• /
• 2004

The present study is suggested to estimate the degree of secondary consolidation caused by various changes of stress such as loading, unloading and reloading in improving poor subsoil through pre-compression loading construction method and, for this purpose, examined the characteristics of the consolidation of Kunsan clay through incremental loading test (IL) using standard consolidation tester and constant loading rate test (CLR), which were adapted from the constant rate of strain test (CRS). In addition, after CRS test, this study determined the characteristics of secondary consolidation and relationships among void ratio, effective stress and time according to the ratio of effective over-consolidation on reloading at the point of time of random expansion. Kunsan clay had larger expansion and smaller secondary consolidation settlement when the ratio of effective over-consolidation was high. In addition, when loading was applied after the load was removed at once, the secondary consolidation coefficient $C'_{\alpha}$ was smaller than that when the load was removed gradually, and when the ratio of effective over-consolidation was over 1.4 a similar value was produced. Based on the entire settlement resulting from reloading, the secondary consolidation coefficient $C"_{\alpha}$ increased non-linearly with the lapse of time but the final value was similar to that in the case of rapid removal. The strain velocity of void ratio was in a regular linear relationship with the increase of loading time regardless of the ratio of effective over-consolidation in both tests and it grew smaller with the increase of the ratio of effective over-consolidation.tion.

• The Journal of Korean Physical Therapy
• /
• v.29 no.2
• /
• pp.101-107
• /
• 2017

Purpose: This purpose of this study was to compare additionally applied weight underwater gait training and over-ground gait training to improve balance and lower extremity strength in stroke patients. Methods: Subjects were randomly allocated into two groups. Underwater gait training group (n=10) and Over-ground gait training group (n=9). The groups performed their respective programs as well as conventional physical therapy 3 times/week for 6 weeks. All subjects were assessed with the Berg balance scale test, the timed up and go test, and the medical research council test pre and post intervention. A paired t test was applied to compare the differences before and after the intervention, and an independent t test was used to compare the differences between the groups. The level of statistical significance was set at p<0.05. Results: The results showed that subjects in the underwater gait training group had a significantly increased Berg balance scale, timed up and go, and medical research council scores (p<0.05), and over-ground gait training group showed a significantly increased medical research council score (p<0.05) after intervention. The underwater gait training group showed a more significant improvement in medical research council, Berg balance scale and the timed up and go test scores compared to the over-ground gait training group (p<0.05). Conclusion: Findings of this study suggest that applying additional weight during underwater gait training improves lower extremity strength and balance in stroke patients. It' findings can contribute to the development of more efficient rehabilitation for stroke patients.

• Journal of Broadcast Engineering
• /
• v.5 no.2
• /
• pp.140-158
• /
• 2000

Testing of terrestrial Digital TV(DTV) broadcasting in Seoul and Kyung-gi region was started in May 1999. Tasks of the committee for DTV technical evaluation were to implement test procedures for DTV transmitting systems, to analyze various technical aspects of DTV and to complete a field test. This paper summarizes the field test results. The field test vehicle was designed and constructed to measure field data. We chose over 200 test points to verify the receiving status of DTV signals and compared them with the analog TV signals at the same site. The results showed stable and satisfactory reception of DTV signals over 70%. The system performance index was over 80%.

• Journal of Korean language education
• /
• v.28 no.3
• /
• pp.1-24
• /
• 2017

This article explores the developmental history of TOPIK over the last 20 years and its recent trends. Over the last two decades, TOPIK underwent two major systematic reforms, achieving both quantitative and qualitative growth over the course of its 52 testing sessions. TOPIK has utilized a six-level evaluation system from its inception to the present. The evaluation system was amended from the earlier six-test set - whereby each level corresponded with a separate test (1997~2005: the $1^{st}{\sim}9^{th}$) - to the three-test set (2006~2014: the $10^{th}{\sim}34^{th}$), and finally to the two-test set (2014~present: the $35^{th}{\sim}42^{nd}$). In the earlier exams, abilities in Vocabulary Grammar, Writing, Listening, and Reading were assessed. However, beginning with the $35^{th}$ TOPIK, abilities in Listening, Reading, and Writing (only in TOPIK II) were assessed and the evaluation of the writing section was changed to a task-based process, improving TOPIK into a more qualified analysis of proficiency. Over the last 20 years, the number of countries TOPIK is administered in has greatly increased from 4 to 73 countries, and the annual number of test-takers has also significantly increased from 2,692 to 250,141. The distribution of proficiency levels of the test-takers has shifted over time - initially "Beginner>Intermediate>Advanced" in the earlier exams, to "Intermediate>Advanced>Beginner" after the mid 2000s - as the number of those studying the Korean language for specific purposes and continuing education increased. Test-takers have indicated a shift in their purpose for taking the exam, initially citing "to assess proficiency" and more recently selecting "to study abroad," and this could also correlate with changes in the proportion of test-takers' proficiency level. In general, 85~95% of beginner, 50~65% of intermediate, and 45~60% of advanced test applicants passed the respective proficiency level. To date, no practices have yet been implemented to standardize the difficulty level longitudinally across test sets.

• The Journal of Korean Physical Therapy
• /
• v.13 no.1
• /
• pp.49-59
• /
• 2001

The purpose of this study was to examine the effect of treatment when the V{\ddot{o}}jta therapy applied to the infant with central coordination disturbance in early stage. The subject were 10 cases : each one with the V{\ddot{o}}jta therapy applied to the group of the infants before 6 months old and the group of the infants over 6 months old. When the V{\ddot{o}}jta therapy was applied I analized the papper which was written about the infants who were diagnosed as moderate CCD and divided two groups which were the infants before 6 months old and the infants over 6 months old. These collected data were analyzed by using t-test. The results of study were as follow; 1. When I compared the locomotion stage after the V{\ddot{o}}jta therapy. t-test showed significant differences. The group of infants before 6 months old had the result 7 to over stage 7 and the group of infants over 6months old had the result 2(p<.05). 2. When I compared the result of the postural reaction after the V{\ddot{o}}jta therapy, 1-test showed significant differences. The group of infants before 6 months old had 6 cases was normalizes and the group of infants over 6 months old had 1 case was normalized(p<.05). 3. When 1 compared the duration of the V{\ddot{o}}jta therapy between the group of infants before 6 months old and the group of infants over 6 months old. t-test showed significant differences. The group of the infants before 6 months old had 5 cases for 1-6 months and 4 cases for 7-15 months, 3 cases for 16-24 months and the group of infants over 6 months old had 6 cases for 7-15 months and cases for 16-24 months, 1 case for 25-30 months(p<.01).