• International Journal of Control, Automation, and Systems
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• v.3 no.3
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• pp.477-485
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• 2005

This paper is concerned with the development of a micro tensile testing machine for optically functional materials such as single or poly crystalline silicon and nickel film. This micro tensile tester has been developed for testing various types of materials and dimensions. PZT type actuation is utilized for precise displacement control. The specifications of the PZT actuated micro tensile testers developed are as follows: the volumetric size of the tester is desktop type of 710mm' 200mm' 270mm; the maximum load capacity and the load resolution in this system are IKgf and 0.0152mgf respectively and; the full stroke and the stoke resolution of the PZT actuator are $1000{\mu}m$ and 10nm respectively. Special automatic specimen installing and setting equipment is applied in order to prevent unexpected deformation and misalignment of specimens during handling of specimens for testing. Nonlinearity of the PZT actuator is compensated to linear control input by an inverse compensation method that is proposed in this paper. The strain data is obtained by ISDG method that uses the laser interference phenomenon. To test the reliance of this micro tensile testing machine, a $200{\mu}m$ thickness nickel thin film and SCS (Single Crystalline Silicon) material that is made with the MEMS fabrication process are used.

• The Journal of the Korean bone and joint tumor society
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• v.6 no.1
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• pp.35-40
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• 2000

We report the radio-frequency ablation technique applied on an osteoid osteoma under CT guide and review other new methods of treatment for the osteoid osteoma. An 18-year-old boy with an osteoid osteoma at the left proximal tibia, which was visible at plain film and MRI. He was treated by the percutaneous radio-frequency ablation technique under CT guide after a needle biopsy. He is free from any symptom and able to do daily activities. So, we proposed that the percutaneous radio-frequency ablation technique under CT guide is the effective and safe treatment method for an osteoid osteoma.

• The Korean Journal of Community Living Science
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• v.24 no.3
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• pp.301-312
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• 2013

The purpose of this study was to investigate the differences between attentional networks according to sex and reflection-impulsivity in the cognitive styles of young children. The subjects of the study were 78 5-year-old children from the kindergarten or daycare center in Busan(with 40 in the reflection group, and 38 in the impulsivity group). The tests were conducted by using the Mating Familiar Test and the Attentional Network Test for young children. The study has used two independent t-tests to find out the differences between attentional networks according to sex, and reflection-impulsivity in the cognitive styles of young children. The results of this study were as follows. First, the boys with reflection cognitive style were significantly slower than the girls with the same style(t=2.18, p<.05). Second, young children with reflection cognitive style were significantly faster in the case of alerting effects than those with impulsivity cognitive style(t=-2.53, p<.05). The young children with reflection cognitive style were slower than those with impulsivity cognitive style in the case of orienting effect(t=2.04, p<.05). Children with a combination of both conflict effect and reflection cognitive style were significantly faster than those with impulsivity cognitive style(t=-2.89, p<.01). The results of the study suggested that there was a difference between attentional networks according to sex and reflection-impulsivity cognitive styles of young children.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.3
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• pp.1844-1852
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• 2015

The purpose of this study was to identity the mediating effect of emotional intelligence on the relationships between creative home environment and creative personality of young children. The subjects of the study were 225 young children from daycare center in Busan. The results of the study are as follow; first, creative home environment were significantly positively correlated to emotional or creative personality of young children. And emotional intelligence were significantly positively correlated to creative personality of young children. Second, emotional intelligence worked as a part mediation variable between creative home environment and creative personality of young children. According to, this study suggests that the creative home environment during early childhood predict their creative personality. Their emotional intelligence, especially is the impact factor that can mitigate effects of the creative home environment.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.502-505
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• 2005

Researches about micro technology travel lively in these days. Such many researches are concentrated in the field of materials and a process field. But properties of micro materials should be known to give results of research developed into still more. In these various material properties, mechanical property such as tensile strength, elastic modulus, etc is the basic property. To measure mechanical properties in micro or nano scale, actuating must be very precise. PZT is a famous actuator which becomes a lot of use to measure very precise mechanical properties in micro research field. But PZT has a nonlinearity which is called as hysteresis. Not precision result is caused because of this hysteresis property in PZT actuator. Therefore feedback control method is used in many researches to prevent this hysteresis of PZT actuator. Feedback control method produce a good result in processing view, but cause a loss in a resolution view. In this paper, hysteresis is compensated by open loop control method. Hysteresis property is modeled in Mathematical function and compensated control input is constructed using inverse function of original data. Reliability of this control method can be confirmed by testing nickel thin film that is used in MEMS material broadly.

• Journal of the Korean Society of Propulsion Engineers
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• v.21 no.5
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• pp.80-87
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• 2017

The performance of a pyrotechnic device that consists of donor/acceptor pair separated by a bulkhead relies on shock attenuation characteristics of the gap material and shock sensitivity of the donor and acceptor explosives. In this research, a micro Kapton flyer was accelerated by an exploding foil initiator (EFI) to figure out shock sensitivity of hexanitrostilbene (HNS) to impact. The averaged shock pressure and duration imparted to the explosive by flyer impact are measured by using a velocity interferometer for any reflector (VISAR) and impedance matching technique. Consequently, this research shows the possibility to determine the critical flyer velocity for initiating the miniaturized pyrotechnic unit by determining the relations between the impact velocity, the amplitude and width of impact loading.

• International Journal of Highway Engineering
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• v.14 no.3
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• pp.121-130
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• 2012

This study develops the evaluation model which is for assessing on the side of users in expressway service areas. The direction of development on Evaluation Criteria is all about on the side of necessity of service area users, the reflection of current conditions, the construction of total evaluation criteria, and the examination of connecting study with current study. After that, this study examines previous evaluation criterias and researchers will select the primary provision of evaluation through FGI, and they derive the final evaluation criteria throughout the verification of suitability on Evaluation Criteria. Throughout AHP analysis which is a professional survey system of users, researchers derive on the side of facilities, on the side of operations, on the side of environments, and on the side of services in order by the weightings.

• Journal of Society of Preventive Korean Medicine
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• v.9 no.1
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• pp.1-16
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• 2005

This study was conducted to identify the needs of introducing new medical specialties in oriental medicine. Three stakeholders in introducing new oriental medical specialties are oriental medical doctors, policy makers and medical consumers. Of the three, this study intended to focus on opinions of oriental medical doctors. About 1,150 self-administered questionaries were sent to the potential respondents, 320 specialists, 250 interns & residents and 580 private oriental medicine practitioners, and 480 doctors responded. The study revealed that 62% of respondents showed negative attitudes towards the introduction of new oriental medicine specialties. The private oriental medical practitioners were more likely not in favor of adding new medical boardmanship. The reasons of objection were as follows : First, it is more important to enrich the existing oriental medical boardmanship (70%). Second, the newly established specialties are most likely to be weakened(15%). The study revealed that the first and most likely specialties to be introduced was Chuna(18%), subspecialization of oriental internal medicine (15.8%), the next oriental family medicine (15.1%) and so on. And the second specialties to be desired most by the respondents were (1) cooperative medicine between the westem and oriental medicine (28%), (2) oriental preventive medicine (17.4%) and (3) oriental family medicine (16.8%). Caution must be exercised in introducing new oriental medicine specialties. The failures of western medicine in the operation of its specialist production should carefully by examined here.

• The Journal of the Korea Contents Association
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• v.10 no.1
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• pp.305-316
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• 2010

The purpose of this study was to identify the relationships between preschool teachers' hemispheric mode indicator and creative personality. The subjects were 205 preschool teachers from kindergarten or nursery school in Busan. The McCanthy(1993)'s HMI(Hemispheric Mode Indicator) and Torrance(1988)'s WKOPAY(What Kind Of Person Are You?) were used to examine the relationships preschool teachers' hemispheric mode indicator and creative personality. Results of this study as follows ; first, the hemispheric mode indicator of right hemispheric dominance were significantly positively correlated to the creative personality and inquisitiveness but negatively correlated to self-confidence among elements of creative personality. Second, the creative personality was significant difference according to hemispheric dominance types. That is, the creative personality of right hemispheric dominance was significantly higher than that of left or exhibit balanced hemispheric dominance but it was no difference between left hemispheric dominance and exhibit balanced hemispheric dominance. Third, there were significant difference self-confidence, inquisitiveness, and awareness of others but no difference Acceptance of Authority and Disciplined Imagination among elements of creative personality according to hemispheric dominance types.

• Journal of Digital Convergence
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• v.15 no.12
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• pp.1-11
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• 2017

The purpose of this study was to investigate the relationship between sexual knowledge or sexual attitudes and reproductive health promotion behaviors of undergraduate students, and to analyze the effects of sexual knowledge on reproductive health promotion behaviors. The research method was a descriptive research study. The subjects were 357 university students with 4 year university students. The research tools used structured questionnaires to measure sexual knowledge, sexual attitudes, and reproductive health promoting behaviors. As a result of the research, first, sexual knowledge of students showed a significant positive correlation with reproductive health promotion behaviors, and there was no relationship between sexual behavior and reproductive health promotion behaviors. Second, sexual knowledge of students had a significant effect on reproductive health promoting behaviors and explained 12.0%. In conclusion, it is suggested that the systematic and practical education program should be developed and applied through university curriculum in order to improve the practice of reproductive health promotion behavior of undergraduate students.