• The Journal of Korea Robotics Society
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• v.11 no.3
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• pp.140-145
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• 2016

In this paper, we fabricate arrayed-type flexible capacitive touch sensor using liquid metal (LM) droplets (4 mm spatial resolution). Poly-4-vinylphenol (PVP) layer is used as a dielectric layer on the electrode patterned Polyethylene naphthalate (PEN) film. Bonding tests between hydroxyl group (-OH) on the PVP film and polydimethylsiloxane (PDMS) are conducted in a various $O_2$ plasma treatment conditions. Through the tests, we can confirm that non-$O_2$ plasma treated PVP layer and $O_2$ plasma treated PDMS can make a chemical bond. To measure dynamic range of the device, one-cell experiments are conducted and we confirmed that the fabricated device has a large dynamic range (~60 pF).

• 한국초전도학회:학술대회논문집
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• 2008.08a
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• pp.41-41
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• 2008

• Proceedings of the Optical Society of Korea Conference
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• 2003.02a
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• pp.38-39
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• 2003

The GaAs semiconductor whispering gallery modes, produced in the peripheral Rayleigh band region of W／sub Rayleigh／ ＝ (${\Phi}$／2)( 1-n／sub eff／n), exhibit novel properties of ultralow thresholds open to nano-ampere regime associated with photonic quantum ring (PQR) production (Fig 1 (a)). The PQR phenomena are associated with a photonic field-driven phase transition of quantum well(QW)-to-quantum wire (QWR) and hence the photonic (non-de Broglie) quantum corral effects, on the Rayleigh cavity confined carriers in dynamic steady state, occur as schematically shown in Fig 1. (omitted)

• Proceedings of the Korea Information Processing Society Conference
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• 2019.05a
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• pp.354-356
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• 2019

데이터 랭글링은 원시 데이터를 분석하기에 더 적합한 형태로 변환하는 프로세스를 말한다. 본 논문에서는 프로그램 합성 기술을 이용하여 테이블 데이터에 대하여 사용자의 의도를 만족하는 데이터 랭글링 프로그램을 자동 생성하는 방법을 제안한다. 제안하는 방법은 입/출력 테이블 예시를 명세로 받아 연산자 시퀸스를 탐색한다. 실험을 통해 제안하는 방법이 빠른 시간 안에 정확한 데이터 랭글링 프로그램을 학습할 수 있음을 보였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.1123-1126
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• 2007

인터넷을 통한 서비스 제공은 법규 준수, 사용 권한 확인, 요금 부과, 차별화된 서비스 제공 등의 다양한 이유로 사용자 인증을 필요로 한다. 이러한 확인 과정은 인증만 되면 언제 어디서든 서비스를 이용할 수 있다는 측면에서 사용자에게도 편리성을 제공해 주지만 사용자의 서비스 이용 정보가 쉽게 기록되고 노출될 수 있는 문제점을 가지고 있다. 이를 해결하기 위한 방법으로 사용자 정보를 보호하면서도 불법적인 사용자에게 악용되지 않도록 하기 위해 추적 가능한 익명성을 보장하는 방안이 제안되고 있다. 하지만 이러한 방법으로는 법 준수를 위한 서비스 제한 규정이나 사용자 별 차별화를 필요로 하는 서비스 모델을 지원하지 못한다. 본 연구에서는 사용자에게는 익명성을 보장하고 적법한 절차를 통한 추후 구매자 추적이 가능하면서도 서비스 제공자에게는 서비스 그룹별로 차별화된 서비스 제공이 가능한 새로운 익명 생성 방안과 이를 적용하는 디지털 콘텐트 구매 프로토콜을 제안하고 있다.

• Applied Microscopy
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• v.51
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• pp.8.1-8.7
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• 2021

Growing demands for comprehending complicated nano-scale phenomena in atomic resolution has attracted in-situ transmission electron microscopy (TEM) techniques for understanding their dynamics. However, simple to safe TEM sample preparation for in-situ observation has been limited. Here, we suggested the optical microscopy based micro-manipulating system for transferring TEM samples. By adopting our manipulator system, several types of samples from nano-wires to plate-like thin samples were transferred on micro-electro mechanical systems (MEMS) chip in a single step. Furthermore, the control of electrostatic force between the sample and the probe tip is found to be a key role in transferring process.

• Earthquakes and Structures
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• v.22 no.3
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• pp.305-318
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• 2022

This paper presents a comparative study of the damage potentials for the 2016 Gyeongju and 2017 Pohang earthquakes in Korea. Plausible technical explanations are provided for the more severe damage observed in the 2017 Pohang earthquake in spite of its relatively weaker magnitude and intensity measures based on the response analysis of elastic and inelastic single-degree-of-freedom systems for the recorded ground motions. In addition, a detailed case study was conducted for a fatally damaged piloti building with an eccentric shear wall core based on nonlinear dynamic analysis using the input ground motions modified for the building site.

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2005.11a
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• pp.425-425
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• 2005

• Proceedings of the Korean Vacuum Society Conference
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• 2003.02a
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• pp.187-187
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• 2003

• Journal of the Earthquake Engineering Society of Korea
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• v.22 no.3
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• pp.161-168
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• 2018

Pohang earthquake occurred on November 15, 2017, with a magnitude of 5.4. The damage of the structure caused by the Pohang earthquake was the most significant in 4-story piloti-type buildings, where the damage patterns were different according to the location of columns and walls at the first story. One building with a staircase at a corner shows shear failure at columns, and Another building with a staircase in the middle shows no failure or shear failure at staircase walls. Therefore, two different piloti-type buildings were selected; one has a staircase at a corner and another has in the middle, and the seismic behavior of the buildings were examined by nonlinear dynamic analysis applying a ground motion measured at Pohang. Analytical model well simulated the actual behavior of the piloti-type buildings during the earthquake. Analysis results showed that walls have an insufficient shear strength wherever the location of the staircase is and columns with insufficient transverse reinforcement could be failed when the staircase is located at a corner. Conclusively, structural engineers should design columns and walls in piloti-type buildings to possess sufficient capacity according to the location of staircase.