• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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• pp.313-313
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• 2008

Aerosol Deposition(AD) method is based on the impact consolidation phenomenon of ceramic fine particles at room temperature. AD is promising technology for the room temperature deposition of the dielectrics thin films with high quality. Embedding of passive components such as capacitors into printed circuit board is becoming an important strategy for electronics miniaturization and device reliability, manufacturing cost reduction. So, passive integration using aerosol deposition. In this study, we examine the effects of the characteristics of raw powder on the thickness, roughness, electrical properties of $BaTiO_3$ thin films. Thin films were deposited on the copper foil and copper plate. Electrical and material properties was investigated as a change of annealing temperature. We final aim the effects of before and after of laminated on the electrical properties and suit of embedded capacitor.

• Smart Structures and Systems
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• 제18권2호
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• pp.335-354
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• 2016

This contribution presents an extended one-dimensional theory for piezoelectric beam-type structures with non-ideal electrodes. For these types of electrodes the equipotential area condition is not satisfied. The main motivation of our research is originated from passive vibration control: when an elastic structure is covered by several piezoelectric patches that are linked via resistances and inductances, vibrational energy is efficiently dissipated if the electric network is properly designed. Assuming infinitely small piezoelectric patches that are connected by an infinite number of electrical, in particular resistive and inductive elements, one obtains the Telegrapher's equation for the voltage across the piezoelectric transducer. Embedding this outcome into the framework of Bernoulli-Euler, the final equations are coupled to the wave equations for the longitudinal motion of a bar and to the partial differential equations for the lateral motion of the beam. We present results for the wave propagation of a longitudinal bar for several types of electrode properties. The frequency spectra are computed (phase angle, wave number, wave speed), which point out the effect of resistive and inductive electrodes on wave characteristics. Our results show that electrical damping due to the resistivity of the electrodes is different from internal (=strain velocity dependent) or external (=velocity dependent) mechanical damping. Finally, results are presented, when the structure is excited by a harmonic single force, yielding that resistive-inductive electrodes are suitable candidates for passive vibration control that might be of great interest for practical applications in the future.

• ETRI Journal
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• 제32권2호
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• pp.327-329
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• 2010

A fully integrated small form-factor HBT power amplifier (PA) was developed for UMTS Tx applications. For practical use, the PA was implemented with a well configured bottom dimension, and a CMOS control IC was added to enable/disable the HBT PA. By using helix-on-pad integrated passive device output matching, a chip-stacking technique in the assembly of the CMOS IC, and embedding of the bulky inductive lines in a multilayer substrate, the module size was greatly reduced to 2 mm ${\times}$ 2.2 mm. A stage-bypass technique was used to enhance the efficiency of the PA. The PA showed a low idle current of about 20 mA and a PAE of about15% at an output power of 16 dBm, while showing good linearity over the entire operating power range.

• 한국공작기계학회논문집
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• 제16권6호
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• pp.201-204
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• 2007

In this paper, fully embedded and miniaturized diplexer device has been developed and characterized for dual-band/mode CDMA handset applications. The size of the embedded diplexer is significantly reduced by embedding high Q circular spiral inductors and high DK MIM capacitors into a low cost organic package substrate. The fabricated diplexer has insertion losses and isolations of -0.5 and -23 dB at 824-894 MHz and -0.7 and -22 dB at 1850-1990 MHz, respectively. Its size is $3.9mm{\times}3.9mm{\times}0.77mm$. The fabricated diplexer is the smallest one which is fully embedded into a low cost organic package substrate.

• Smart Structures and Systems
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• 제23권6호
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• pp.695-702
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• 2019

The number of cable-stayed bridges has been increasing worldwide, causing issues in maintaining the structural safety and integrity of bridges. The stay cable, one of the most critical members in cable-stayed bridges, is vulnerable to wind-induced vibrations owing to its inherent low damping capacity. Thus, vibration mitigation of stay cables has been an important issue both in academia and practice. While a semi-active control scheme shows effective vibration reduction compared to a passive control scheme, real-world applications are quite limited because it requires complicated equipment, including for data acquisition, and power supply. This study aims to develop an Arduino-based integrated cable vibration control system implementing a semi-active control algorithm. The integrated control system is built on the low-cost, low-power Arduino platform, embedding a semi-active control algorithm. A MEMS accelerometer is installed in the platform to conduct a state feedback for the semi-active control. The Linear Quadratic Gaussian control is applied to estimate a cable state and obtain a control gain, and the clipped optimal algorithm is implemented to control the damping device. This study selects the magnetorheological damper as a semi-active damping device, controlled by the proposed control system. The developed integrated system is applied to a laboratory size cable with a series of experimental studies for identifying the effect of the system on cable vibration reduction. The semi-active control embedded in the integrated system is compared with free and passive mode cases and is shown to reduce the vibration of stay-cables effectively.

• Journal of Acupuncture Research
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• 제20권1호
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• pp.85-96
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• 2003

Objectives : We were studied the retaining needle to offer basic materials for the study of it. methods: To study the retaining needle, we were reviewed the ancient, the present text and the thesis. Results: 1. There are many ways form general acupuncture technique to needle-embedding therapy by the spending time of the retaining needle. 2. The method retaining needle is divided into Active method of the retaining needle(動留針法) and Passive methoid of the retaining needle(靜留針法) by the existence of Qi-promoting. 3. In case of Deficiency Syndrome, protracted discase, dolorific disorder, convulsive disorder, and Cold Syndrome, the spending time of the retaining needle takes longer, in case of Heat Syndrome and exterior Syndrome, the spending time of the retaining needle takes shorter. 4. In case of acute disease and attack of chronic disease, we can use Active methoid of the retaining needle(動留鍼法) with retaining needle for a long time, in case of chronic disease, we can use Passive methoid of the retaining needle(靜留針法). 5. In case of Young people, a man in the prime of life, and a people who can stand the stimulation of needle, we can make the spending time of the retaining needle be longer and use Active methoid of the retaining needle(動留針法), but in case of a baby and a weak people, we had better shorten the spending time of the retaining needle or not do it. 6. The spending time of the retaining needle must be shorter in spring and summer, must be longer in fall and winter. 7. The spending time of the retaining needle is various by acupuncture point. 8. When the spending time of the retaining needle is too longer, we can injure Vital-qi of a patient, otherwise in opposite situation, Pathogenic is stagnated so pathogenic stage is repeated.

• 벤처창업연구
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• 제8권3호
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• pp.27-37
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• 2013

정부가 기술벤처창업 육성을 위해 대규모 정부재원과 정책적 노력을 기울여 왔음에도 불구하고 창조형 창업은 부진하다는 분석이 제시되었다. 이에 정부는 그동안 창업자직접지원방식에 문제가 있음을 진단하고 정책의 패러다임을 시장전문가를 통한 간접지원방식으로 전환하고 있다. 이의 일환으로 정부는 최근 벤처 창업자금 생태계 선순환 방안을 발표하며 엔젤투자 및 M&A 활성화에 주력하고 있다. 특히 이번 정책은 창조경제 멍석깔기로 대변되며 그 핵심에는 창업자에 대한 엔젤투자활성화가 포함되어 있다. 그러나 이번 정책은 엔젤투자를 주도할 전문엔젤이 부족하다는 것이 치명적인 문제로 지적되고 있다. 더구나 실질적인 창업생태계 사례를 통해보면 엔젤투자를 전문적으로 수행할 전문엔젤은 단기간에 양성되는 것이 아니라 일정한 시간소요를 필요로 해 정책의 실효성 확보에 난제가 되고 있다. 본 연구는 이에 대한 대안으로 엔젤투자역량을 겸비한 창업 Facilitators 양성방안을 제시하고 있다. 본 연구는 기존의 단순엔젤투자가들과 BI 매니저 및 창업단계 컨설턴트인 창업지도사와 산학협력관련 전문가들을 일정한 교육과 훈련을 통해 엔젤투자 역량을 갖춘 창업 Facilitators로 양성하는 방법을 구체적으로 제시하였다. 이 연구는 크게 네 가지 연구를 수행하였다. 첫째, 정책적 선행연구로, 본 연구는 기존의 창업자 직접지원방식의 정책이 야기한 문제점과 이에 대한 대안제시를 목적으로 이스라엘의 벤처육성모델을 벤치마킹하였다. 둘째, 이론적 선행연구로, 본 연구는 창업단계 투자와 보육을 전담하고 있는 엔젤투자자와 BI 매니저 등에 대한 현황을 분석하였다. 셋째, 본 연구는 국내 창업지원전문가 부족문제를 해결해 줄 창업 Facilitators의 도입 필요성과 개념을 제시하였고, 넷째 본 연구는 국내 현실을 고려한 창업 Facilitators의 양성방안을 제시하였다.