• Journal of Digital Convergence
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• v.13 no.1
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• pp.1-10
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• 2015

This paper discusses entrepreneurship as a mean to overcome problems that arise from economic growth with no job growth and with aging population. In particular, this paper focuses on senior (elderly) entrepreneurship based on technology. It examines and defines restraints of various public and private sponsor programs for senior entrepreneurship. In comparison, Bridge Program of Finland was studied and its success factors are presented. Some of these success factors are enterprise-driven program operation, diverse education program focused on successful senior entrepreneurship, providing networking opportunities among entrepreneurs, and increased awareness in social responsibility of private enterprises. This paper suggests CBI (Corporate Business Incubator) in order to promote senior entrepreneurship. This study is expected to foster economic growth and job creation through utilizing increased elderly population in today's aging demographics. In addition, this study will be able to identify direction for government's role in boosting senior entrepreneurship.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.4
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• pp.80-87
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• 2015

Memristor is a new kind of memory device whose resistance varies depending upon applied charge and whose previous resistance state is preserved even when its power is off. Ordinary memristor has a nonlinear programming characteristics about time when a constant voltage is applied. For the easiness of programming, it is desirable that resistance is programmed linearly about time. We had proposed previously a memristor bridge configuration with which weight can be programmed nicely in positive, negative or zero. In memristor bridge circuit, two memristors are connected in series with different polarity. Memristors are complementary each other and it follows that the memristance variation is linear with respect to time. In this paper, the linearization effect of weight programming of memristor bridge synapse is investigated and verified about both $TiO_2$ memristor from HP and a nonlinear memristor with a window function. Memristor bridge circuit would be helpful to conduct synaptic weight programming.

• The Transactions of the Korean Institute of Power Electronics
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• v.4 no.4
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• pp.342-348
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• 1999

This paper describes a low-cost single-phase active power filter, which consists of a half-bridge P\A미1 inverter with a s simple control circuit. In order to verify the performance of proposed active power filter, many computer simulations w with EMTP codes and experimental works with a hardware prototype were done. Both results confirm that the p proposed active power filter shows excellent performance to eliminate the harmonics generated in the single-phase non l linear‘ load. The active power filter has advantage of low implementation cost and compact size. using a half-bridge i inverter and a simple control circuit with only one current sensor. So. it can be fabricated as a plug-in type.

• Journal of Gifted/Talented Education
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• v.26 no.4
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• pp.635-652
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• 2016

This study investigated operation plan for the Cyber Bridge Program based on the survey from teachers of science high schools. Teachers were found to be thinking it positive that cyber programs can be operated free from the time and spatial restrictions. They thought that teacher interactions are hard to occur and teachers' role in learning is limited as well. Also, the geographical, physical, and socio cultural minorities might have benefits from cyber programs either as regular programs or the before entrance programs. Therefore, the detailed plans are needed. Most of all, since the educational contents are the key for the programs, we suggested some contents categories and developmental criteria. As a result, the developments of high quality contents and financial supports for the successful Cyber Bridge Program are essential.

• Korea Science and Art Forum
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• v.20
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• pp.421-428
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• 2015

Electronic/hybrid car and electroplating rectifier should have switching devices such as SCR, MOSFET, IGBT. And those switching devices should be operated by gate driver. In this paper, we propose high power gate driver that contains H-Bridge using 4 BJTs. H-Bridge and transformer generate isolate power. And gate control signal is transferred to isolated one by photo coupler and operate real switching device. We designed H-Bridge and 555-Timer by PSpice simulation and manufactured real product. Finally we succeed to operate 27V 50,000A electroplating rectifier using proposed gate driver.

• The Journal of the Convergence on Culture Technology
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• v.9 no.6
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• pp.41-47
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• 2023

This study was conducted to determine the effect of an exercise program applied to prevent musculoskeletal changes that occur due to aging on pain, muscle strength, balance ability, and falling efficacy in elderly women. An exercise program including quadriceps setting exercise, bridge exercise, resistance band exercise, and foam roller exercise was applied to elderly women aged 65 years or older once a week for 8 weeks. A visual analog scale was used to evaluate pain, muscle strength was evaluated using a digital muscle strength meter, balance ability was measured using the Berg balance scale, and fear of falling was evaluated using the fall efficacy scale. As a result of the study, compared to before the experiment, pain in the lower back and knee area was significantly reduced, the strength of the quadriceps femoris and gluteus maximus was significantly increased, and balance ability and falling efficacy were significantly improved. In conclusion, application of a program that includes various exercise methods has a positive effect on the physical activity of elderly women by strengthening the musculoskeletal system. Additionally, in order to prevent physical changes due to aging, an exercise program that includes various exercise methods that can strengthen the musculoskeletal system should be applied.

• Journal of Digital Contents Society
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• v.16 no.5
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• pp.823-834
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• 2015

This study analysed motion graphic formative image composition of TV LED backdrop to be used as background display for performers such as singers appeared on TV music show. Motion graphic LED images are comprised of various plane figures, and backdrop's design function as background screen has a goal to convey synesthesia and sensibility of visual elements. And this analyse classified sensibility concept about color, motion direction and speed to be elements of transmitting sensibility. As the analyse of graphic form among transmitting sensibility elements, this classified form type into its' applied elements, and studied how these elements' motion pattern and arrangement could be placed and replaced at song's four step composition, intro, verse, bridge, chorus part, and also characterized differences of backdrop design for male and female performers. As a case study, it included terrestial broadcasting TV song ranking shows targeted at teenagers. Because they carried out various motion design utilizations. Finally, this reasoned out mainly designing form type, its' applied elements, motion pattern and its' arrangements type division according to the song developing four steps.

• The Journal of the Korea Contents Association
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• v.14 no.5
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• pp.281-288
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• 2014

This study has surveyed patient education and counseling, based on the data you want to utilize the expectations on dental prosthetic appliances (denture, bridge) and implants among 307 workers who participated in reservists mobilization training of Hyundai Heavy Industries located in Ulsan City. The reliability of expectations on dental prosthetic appliances and implants were fairly high at cronbach'${\alpha}$ of .971 and .967 respectively. The collected data was analyzed through IBM SPSS Statistics. v. 19.0 program at the significance level of 0.05. The research findings are as follows. First, the expectations on prosthetic appliances scored an average of 3.98. Second, the expectations on implants scored an average of 3.74. Third, the expectations on implants depending on subjective health status scored an average of 3.74, which were statistically significant (p=0.003). Fourth, the differences in expectations on implants depending on the concerns for oral hygiene care scored an average of 3.74, which were statistically significant (0<0.001). Fifth, the expectations on prosthetic appliances and implants were strongly correlated at 0.392. As a result of implants of prosthodontics need for accurate information transfer.

• The Transactions of the Korean Institute of Power Electronics
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• v.7 no.1
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• pp.30-40
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• 2002

This paper studies the electronic ballast development for 250w MH lamps. We have improved the input power factor using a PFC IC. To provide the rating voltage required In the lamps, we have used the buck type dc-dc converter By this method, the stress of switching devices in inverter can be reduced. The inverter is the Full-Bridge type. To eliminate the acoustic resonance phenomena of MH lamps, we have added the high frequency sinewave voltage to the low frequency square-wave voltage to the lamp. We hove developed the igniter circuit using the L, C devices. We could control dimming of the lamp by varying the output voltage of the buck converter. The time of illuminating lamps and luminous intensity could be adjusted by season and time band. The buck converter output voltage can be controlled and the no load and over current situation were Protected by the development of the microprocessor Program.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.49 no.2
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• pp.1-8
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• 2012

This paper presents the accelerometer which is a key component of TPMS(Tire Pressure Monitoring System). Generally a piezoresistive accelerometer has characteristics of lower cost, better linearity and better immunity about the environmnet noise than a capacitive one. Three types of piezoresistive accelerometers are degined and simulated using ANSYS program. The best one is a piezoresistive sensor which is supported by four beams located at the center of the edge of the mass after comparing the characteristics of resonant frequency of the three types. Considering the sensor size and a simulated maximum stress and maximum displacement, the length of beams is set as $200{\mu}m$. The size of a piezoresistive accelerometer is $3.0mm{\times}3.0mm{\times}0.4mm$. The sensor output is characterized by measuring the output characteristic depending on angle. As a result the offset voltage of the accelerometer is 43.2 mV and its sensitivity is $42.5{\mu}V/V/g$. The temperature bias drift is measured. The shock durability of the sensor is 1500g and the measuring range is 0 ~ 60 g.