• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2000.04a
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• pp.139-141
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• 2000

Carboxylic acid group was introduced onto polyethylene (PE) film by the grafting of acrylic acid onto PE film irradiated with electron beam. The grafting Condition such as reaction temperature, additives, total irradiation dose, thickness of PE film, and monomer concentration was examined. The extent of grafting was found to increase with increasing reaction temperature and total irradiation dose. The grafting yield was much enhanced with the addition of both FeSO$_4$ 7H$_2$O and H$_2$SO$_4$.

• 대한예방의학회:학술대회논문집
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• 2005.10a
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• pp.453-453
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• 2005

• 대한예방의학회:학술대회논문집
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• 2005.10a
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• pp.488-488
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• 2005

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1547_1548
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• 2009

제안된 Fabry-Perot Interferometer (FPI) 어레이 기반 IR 스펙트로미터는 상층부에 FPI 어레이와 하단에 $V_2O_5$ 볼로미터 IR 적외선 센서어레이로 크게 두 부분으로 구성된다. 이 구조에서 다양한 FPI 공진 캐비티의 두께에 의해 특정 공진 파장이 선택되어 진다. 그리고 각각의 볼로미터 IR 디텍터는 IR 파장에 상응하는 투과도를 감지해낸다. 다양한 박막 필터 시뮬레이션 결과를 통해 제작된 FPI 어레이 기반 IR 스펙트로미터는 $3{\sim}5{\mu}m$의 적외선 파장대역에서 흡수 스펙트럼을 가지는 $CH_4$, $CO_2$, $N_2O$, CO 가스 검출을 위해 다층 박막 FPI 층의 다층 박막 FPI 층의 투과율을 높였다.

• Journal of Chest Surgery
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• v.50 no.4
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• pp.312-315
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• 2017

In the embryo, the thymus originates from the third and fourth pharyngeal pouches and migrates from the superior neck to the mediastinum. Ectopic cervical thymoma (ECT) is an extremely rare tumor that originates from ectopic tissue, and is caused by the aberrant migration of the embryonic thymus. Our patient was a 30-year-old woman who had a nodular lesion in the neck for several years. Ultrasonography and computed tomography were performed. She underwent surgery, and a histological examination resulted in a diagnosis of type AB thymoma. Herein, we report a case of ECT that was resected through a transcervical approach.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.447-447
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• 2011

We studied to detect the mass variation using micro mechanical resonator. For measuring the resonance frequency of the micro mechanical system, optical method using laser interference is selected. A simple resonator is prepared by attaching an AFM cantilever on the piezo stack. The piezo stack makes a the cantilever vibrated with its resonance frequency. To change the mass of the resonator, gold was evaporated on the cantilever. We measured how much resonance frequency was changed according to the amount of gold attached on cantilever. This resonator is able to perform the role of a mass sensor and has a resolution of the order of micrograms. The fabrication of the resonator and measurement setup for detecting the mechanical resonance will be introduced in this presentation.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08b
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• pp.1482-1485
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• 2007

A three-dimensional (3D)-two-dimensional (2D) convertible display system using a plastic fiber array is proposed. The proposed system has an advantage of making use of a light source for 3D image from an arbitrary location. The optical efficiency of 3D images in the proposed system is enhanced compared with previous research.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.511-512
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• 2006

Three stage(CIC-FIR-FIR) decimation filter in delta-sigma A/D converter for audio is designed. A canonical signed digit(CSD) code method is used to minimize area of multipliers. This filter is designed in 0.25um CMOS process and incorporates $1.36\;mm^2$ of active area. Measured results show that this decimation filter is suitable for digital audio A/D converters.

• Journal of Information Processing Systems
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• v.2 no.2
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• pp.101-106
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• 2006

Grid computing is an emerging technology that enables global resource sharing. In Korea, the $K^*$Grid provides an extremely powerful research environment to both industries and academia. As part of the $K^*$Grid project, we have constructed, together with the Korea Institute of Science and Technology Information and a number of domestic universities, a supercomputer Grid test bed which connects several types of supercomputers based on the globus toolkit. To achieve efficient networking in this Grid testbed, we propose a novel method of available bandwidth measurement, called Decoupled Capacity measurement with Initial Gap (DCIG), using packet trains. DCIG can improve the network efficiency by selecting the best path among several candidates. Simulation results show that DCIG outperforms previous work in terms of accuracy and the required measurement time. We also define a new XML schema for DCIG request/response based on the schema defined by the Global Grid Forum (GGF) Network Measurement Working Group (NM-WG).

• Journal of Sensor Science and Technology
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• v.29 no.4
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• pp.270-274
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• 2020

In this study, a read-out integrated circuit (ROIC) that can be applied to a colorimetry-based optical sensor for analyzing total phosphorus and total nitrogen was developed and characterized. The proposed ROIC minimizes the effect on temperature fluctuation, improves sensitivity, and extends the dynamic range by utilizing a dual optical path and feedback control circuit. Using a dual optical path makes it possible to calibrate the output signal of the optical sensor automatically, along with the temperature fluctuation. The calibrated voltage is fed back into the measurement stage; thus, the output current of the measurement is adaptively controlled. As a result, the sensitivity and dynamic range of the proposed ROIC are improved. Finally, a total-phosphorus analysis was conducted by utilizing the ROIC. The ROIC was found to operate stably over a wide temperature range.