• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.38 no.3
• /
• pp.211-219
• /
• 2001

This paper describes a read-only CMOS transponder IC for RFID applications. A full-wave rectifier implemented using NMOS transistors supplies the transponder with a dc supply voltage using the magnetic field generated from a reader. A 64-bit ROM has been designed for a data memory. Front-end impedance modulation and Manchester coding are used for transmitting the data from the transponder memory to the reader. A new damping circuit which has almost constant damping rate under the variations of the distance between the transponder and the reader has been employed for impedance modulation. The designed circuit has been fabricated using a 0.65${\mu}{\textrm}{m}$2-poly, 2-metal CMOS process. Die area is 0.9mm$\times$0.4mm. Measurement results show that it has a constant damping rate of around 20~25% and a data transmission rate of 3.9kbps at a 125KHz RF carrier. The power required for reading operation is about 100㎼. The measured reading distance is around 7cm.

• Journal of the Institute of Electronics Engineers of Korea TE
• /
• v.42 no.3
• /
• pp.45-50
• /
• 2005

A UV camera is being used in various application regions such as industry, medical science, military, and environment monitoring. A ROIC(ReadOut IC) is developed and can read the responses from UV photodiode sensors which are made with III-V nitride semiconductors of GaN series haying high resolution and high efficiency. To design FPA(Focal Plane Array) UV $8{\times}8$ ROIC, the photodiode type sensor devices are modeled as the capacitor type ones. The ROIC reads out signals from the detector at)d outputs sequentially pixel signals after amplifying and noise filtering of them. The ROIC is fabricated using the $0.5{\mu}m$ 2Poly 3Metal N-well CMOS process. And then, it and photodiode array are hybrid bonded by gold stud bumping process using ACP(Anisotropic Conductive Paste). After the packaging, UV images appearing on PC verified the operations of the ROIC.

• Proceedings of the IEEK Conference
• /
• 2002.06b
• /
• pp.293-296
• /
• 2002

This paper proposes new driving methods for designing a driver independent of the current property of organic light emitting diodes (OLED) displays. The proposed methods are the Look-Up Table (LUT) and the Pulse Width Modulation (PWM). The LUT is used to handle the amount of the current for driving the OLED display panel and the PWM is applied to represent the gray scale on the OLED display panel. Segment and common drivers were implemented using delay circuits to prevent short-circuit current and a DC-DC converter was designed to supply the drivers with a power source. In particular, tile proposed methods are used for the manufacturing of 1.8" 128$\times$128 dot passive matrix OLED display panel. The designed circuit was fabricated using 0.6w, 2-poly, 3-metal, CMOS process and applied to the Personal Communication System (PCS) phone successfully.ully.

• Polymer(Korea)
• /
• v.33 no.1
• /
• pp.52-57
• /
• 2009

This study investigates the metal adsorption properties of poly (lactic acid)-g-acrylic acid (PLA-g- AAc) synthesized by UV irradiation method. The properties including degree of grafting, water content, and ion exchange capacity (IC) strongly depend on the critical experimental factors such as UV intensity and AAc concentration. Under the optimized condition, the maximum degree of grafting, the IC value, and water content are 28%, 1.13 meq/g, and 38%, respectively. The synthesized ion exchanger shows strong capacity of adsorption for divalent metal ions such as $Cu^{2+}$, $Ni^{2+}$, and $Co^{2+}$, and greater selectivity of adsorption for $Cu^{2+}$.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.38 no.3
• /
• pp.57-57
• /
• 2001

본 논문에서는 RFID를 위한 읽기 전용 CMOS 트랜스폰더를 one-chip으로 설계하였다. 리더에서 공급되는 자기장으로부터 트랜스폰더 칩의 전원을 공급하기 위한 전파정류기를 NMOS 트랜지스터를 사용하여 설계하였으며, 데이터 저장 소자로는 64비트의 ROM을 사용하였다. 메모리에 저장되어 있는 ID 코드는 Manchester 코딩되어 front-end 임피던스 변조 방식으로 리더에 전송된다. 임피던스 변조를 위한 감폭회로로는 리더와 트랜스폰더 사이의 거리가 변해도 일정한 감폭율을 갖는 새로운 감폭회로를 사용하였다. 설계된 회로는 0.65㎛ 2-poly, 2-metal CMOS 공정을 사용하여 IC로 제작되었다. 칩 면적은 0.9㎜×0.4㎜이다. 측정 결과 설계된 트랜스폰더 IC는 인식거리 내에서 약 20∼25%의 일정한 감폭율을 보이며, 125㎑의 RF에 대해 3.9kbps의 데이터 전송속도를 보인다. 트랜스폰더 칩의 전력소모는 읽기 모드시 약 100㎼이다. 인식거리는 약 7㎝이다.

• Composites Research
• /
• v.18 no.3
• /
• pp.31-37
• /
• 2005

In this work, poly(ethylene oxide) (PEO) nanofibers were fabricated by electrospinning to prepare the nanofibers-reinforced composites. And the PEO powders-impregnated composites were also prepared to compare the mechanical interfacial behaviors of the composites. Morphology and fiber diameter of PEO nanofibers were determined by SEM observation. Mechanical interfacial properties of the composites were investigated in fracture toughness $(K_{IC})$ and interlaminar shea. strength (ILSS) tests. As a result, the fiber diameter was decreased with increasing the applied voltage. And optimum condition for the fiber formation was 15 kV, resulting from increasing of jet instability at high voltage. The PEO-based nanofibers-reinforced epoxy composites showed the improvements of both $K_{IC}$ and ILSS, compared to the composites impregnated with PEO powders. These results indicated that the nanofibers had higher specific surface area and larger aspect ratio than those of the powders, which played an important role in improving the mechanical interfacial properties of the composites.

• Proceedings of the KIEE Conference
• /
• 2002.07d
• /
• pp.2577-2579
• /
• 2002

In this paper, we describe a CMOS DC-DC converter with a variable output voltage(8-12V @100mA) for a portable battery-operated system applications. The proposed DC-DC converter is used along with a Pulse-Frequency Modulation (PFM) method and consists of a reference circuit, a feedback resistor, a controller, and an internal oscillator. The integrated DC-DC converter with two external passive components(L.C) has been designed and fabricated on a 0.6${\mu}m$ 2-poly, 3-metal CMOS process and could be applied to the Personal Digital Assistants(PDA), Cellular Phone, Laptop Computer, etc.

• Bulletin of the Korean Chemical Society
• /
• v.33 no.4
• /
• pp.1147-1153
• /
• 2012

Benzofuran-7-carboxamide was identified as a novel scaffold of poly(ADP-ribose) polymerase-1 (PARP-1) inhibitor. A series of compounds with various 2-substituents including (tertiary amino)methyl moieties substituted with aryl ring and aryl groups containing tertiary amines, were synthesized and biologically evaluated to elucidate the structure-activity relationships and optimize the potency. 2-[4-(Pyrrolidin-1-ylmethyl)phenyl]-benzofuran-7-carboxamide (42) was the most potent as an IC50 value of 40 nM among those.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2008.06a
• /
• pp.545-545
• /
• 2008

Poly-Si is an essential material for floating gate in NAND Flash memory. To fabricate this material within region of floating gate, chemical mechanical polishing (CMP) is commonly used process for manufacturing NAND flash memory. We use colloidal silica abrasive with alkaline agent, polymeric additive and organic surfactant to obtain high Poly-Si to SiO2 film selectivity and reduce surface defect in Poly-Si CMP. We already studied about the effects of alkaline agent and polymeric additive. But the effect of organic surfactant in Poly-Si CMP is not clearly defined. So we will examine the function of organic surfactant in Poly-Si CMP with concentration separation test. We expect that surface roughness will be improved with the addition of organic surfactant as the case of wafering CMP. Poly-Si wafer are deposited by low pressure chemical vapor deposition (LPCVD) and oxide film are prepared by the method of plasma-enhanced tetra ethyl ortho silicate (PETEOS). The polishing test will be performed by a Strasbaugh 6EC polisher with an IC1000/Suba IV stacked pad and the pad will be conditioned by ex situ diamond disk. And the thickness difference of wafer between before and after polishing test will be measured by Ellipsometer and Nanospec. The roughness of Poly-Si film will be analyzed by atomic force microscope.

• Journal of Microbiology and Biotechnology
• /
• v.20 no.4
• /
• pp.693-699
• /
• 2010

An antiproliferative ribonuclease with a new N-terminal sequence was purified from fruiting bodies of the edible wild mushroom Russula delica in this study. This novel ribonuclease was unadsorbed on DEAE-cellulose, but absorbed on SP-Sepharose and Q-Sepharose. It had a molecular mass of 14 kDa, as judged by fast protein liquid chromatography on Superdex 75 and SDS-polyacrylamide gel electrophoresis. Its optimal pH and optimal temperature were pH 5 and $60^{\circ}C$, respectively. The ranking of its activity toward various polyhomoribonucleotides was poly C> poly G>poly A>poly U. It could inhibit proliferation of HepG2 and MCF-7 cancer cells with an $IC_50$ value of $8.6\;{\mu}M$ and $7.2\;{\mu}M$, respectively. It was devoid of antifungal and HIV-1 reverse transcriptase inhibitory activity.