• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2003.11a
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• pp.136-139
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• 2003

A clock recovery circuit for a 40 Gb/s optical receiver has been designed and implemented. The clock recovery circuit consists of signal amplifiers, a nonlinear circuit with diodes, and a bandpass filter Before implementing the 40 Gb/s clock recovery circuit, a 10 Gb/s clock recovery circuit has been successfully implemented and tested. With the 40 Gb/s clock recovery circuit, when a 40 Gb/s NRZ signal of -10 dBm was applied to the input of the circuit, the 40 GHz clock was recovered with the -20 dBm output power after passing through the nonlinear circuit. The output signal from the nonlinear circuit passes through a narrow-band filter, and then amplified. The implemented clock recovery circuit is planned to be used for the input of a phase locked loop to further stabilize the recovered clock signal and to reduce the clock jitter.

• Korean Journal of Acupuncture
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• v.24 no.1
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• pp.145-160
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• 2007

Objectives : The purpose of this study is to observe the anti-oxidative effects of electroacupuncture at Wijung (BL40) in rats. Methods : The author performed several experimental items including measurements of body weight, liver index, levels of albumin, total bilirubin, LDL-cholesterol, LDH, GOT and GPT in blood serum, and levels of SOD, glutathione, catalase, No and MDA (malondialdehyde) in liver, histological analysis of liver. Results : 1. In the BL40-EA group, liver index was decreased significantly compared to those of the control group, the holder group and the sham-EA group. 2. In the BL40-EA group, the albumin level was increased significantly compared to those of the control and holder group. LDL-cholesterol and GOT level were increased significantly compared to those of the control group and the holder group. 3. In the BL40-EA group, the SOD activity & the Catalase activity were decreased significantly compared to those of the control group and the holder group. 4. In the BL40-EA group, the density of liver tissue was more similarly maintained to the normal group compared to those of the control group and the holder group. Conclusion : These results suggest that electroacupuncture at BL40 has an antioxidant effect in human, and hereafter continuous study & clinical application is needed.

• 한국초전도학회:학술대회논문집
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• v.9
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• pp.27-32
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• 1999

We developed a 40-channel superconducting quantum interference device (SQUID) system for neuromagnetic measurements. The main features of the system are use of double relaxation oscillation SQUID (DROS), and planar gradiometer for measuring tangential field components. The DROSS with high flux-to-voltage transfers enabled direct readout of the SQUID output by room-temperature electronics and simple flux-locked loop circuits could be used for SQUID operation. The pickup coil is an integrated first-order planar gradiometer with a baseline of 40 mm. The average noise of the 40 channels is around 1.2 fT/cm/${\sqrt{Hz}}$ at 100 Hz, corresponding to the field noise of 5 fT/${\sqrt{Hz}}$ at 100 Hz, operated inside a magnetically shielded room. The 40-Channel system was applied to measure auditory-evoked neuromagnetic fields.

• The Korean Journal of Malacology
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• v.30 no.1
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• pp.41-49
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• 2014

This study was conducted to investigate the effects of cadmium (Cd) exposure on biochemical factors in the hemolymph and hepatopancreas of the abalone, Haliotis discus hannai. The abalone were exposed to 0, 5, 10, 20 and 40 ${\mu}g/L$ Cd for 4 weeks. The phenoloxidase (PO) activity was decreased in hemolymph of abalone exposed to 40 Cd ${\mu}g/L$ for 4 weeks compared to the control (P < 0.05). The hemolymph enzymes, alkaline phosphatase (ALP), aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities were markedly elevated in 40 Cd ${\mu}g/L$ after 4 weeks. The hemolymph calcium concentrations were significantly decreased in 20 and 40 Cd ${\mu}g/L$ for 4 weeks. Hepatopancreas superoxide dismutase (SOD) and catalase (CAT) activities were significantly increased by Cd. SOD was increased in both 20 and 40 Cd ${\mu}g/L$ and CAT, in 40 Cd ${\mu}g/L$ after 2 weeks (P < 0.05). These results suggested that the abalone SOD and CAT including PO may serve as a protective mechanism against oxidative stress by Cd. We conclude that a Cd concentration, 40 ${\mu}g/L$ in water may curtail hemolymph homeostasis and anti-oxidative reactions in abalone hepatopancreas. From these results, these biochemical factors may represent a convenient method of monitoring heavy metal pollution in coastal areas.

• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.1621-1623
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• 2004

The $Pb(Zr_{0.52}Ti_{0.48})O_3/(Ba_{0.6}Sr_{0.4})TiO_3$ [PZT(52/48)/BST(60/40)] heterolayered thin films were deposited on Pt/Ti/$SiO_2$/Si substrates by using the RF sputtering method with RF powers of 60,70,80,90[W]. All thin films showed the peaks of the tetragonal phase. Increasing the RF power, dielectric constant and loss of the PZT(52/48)/BST(60/40)] heterolayered thin films were decreased. The thickness ratio of PZT and BST thin films was 1/1. The relative dielectric constant and the dielectric loss of the PZT(52/48)/ BST(60/40) heterolayered thin films were 562 and 13%, respectively.

• Proceedings of the KIEE Conference
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• 2006.10a
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• pp.89-90
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• 2006

We synthesized emissive materiaJs, nameJy $Zn(HPB)_2$. The fundamentaJ structures of the OLEDs were ITO / NPB (40 nm) $Zn(HPB)_2$ (40 nm) / $Alq_3$:DCJTB (20, 30, or 40 nm) / LiF / AI. We varied the thickness of $Alq_3$:DCJTB from 20 nm to 40nm. We measured current density-voJtage and luminance-voJtage characteristics at room temperature. When the thickness of the Alq3:DCJTB layer was 40 nm, white emission is achieved. The CIE coordinates are (0.32, 0.33) at an applied voltage of 14V.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.17 no.2 s.105
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• pp.171-177
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• 2006

A low-cost, high-performance 40 Gb/s clock recovery module using a phase-locked loop(PLL) for a 40 Gb/s optical receiver with the clock-hold function has been designed and implemented. It consists of a clock extractor circuit, an RF mixer and a frequency discriminator for phase/frequency detection, a VC-DRO, a phase shifter, and a clock-hold circuit. The extracted 40 GHz clock is synchronized with a stable 10 GHz VC-DRO. The clock stability and jitter characteristics of the implemented PLL-based clock recovery module are significantly improved as compared with those of the conventional open-loop type clock recovery module with a DR filter. The measured peak-to-peak RMS jitter is about 230 fs. When an input signal is dropped, the 40 GHz clock is maintained continuously by the hold circuit.

• Korean Journal of Food Science and Technology
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• v.29 no.4
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• pp.817-822
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• 1997

Inhibitory mechanism of the anticoagulant polysaccharide purified from the fruit body of Coriolus versicolor was investigated in this paper. The anticoagulant polysaccharide (CV-40-Va-1) was proposed to have functions of the inhibition of intrinsic pathway in the blood coagulation pathway together with the interuption of a human platelet aggregation induced by von Willebrand factor (vWF). CV-40-Va-I inhibited other factors of the coagulation cascade such as factor VIII, IX, and as well as thrombin. Especially, CV-40-Va-I inhibited the fibrin formation mediated by thromin, however the polysaccharide did not affect the fibrin formation directly but affected the anticoagulant activity through the activation of antithrombin III. The sulfation of the anticoagulant polysaccharide increased the anticoagulant activity, showing that the sulfate concentration of anticoagulant polysaccharide was important factor in the blood coagulation cascade. Low molecular weight subfraction (MW 1,000) obtained by partial hydrolysis of the CV-40-Va-1 generated potent antiplatelet activity, but showed decreased anticoagulant activity.

• Parasites, Hosts and Diseases
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• v.33 no.2
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• pp.101-106
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• 1995

Soluble protein of purified Pneumocvstis cnrinii was prepared from experimentally infected rats. SDS-PAGE of the crude antigen resolved about 20 protein bands from 20 to 200 kDa. Out of thenl, 116 kDa band strongly reacted and 45-55 and 100 kDa bands reacted weakly to the positive reference human serum from U.S.A. Western blot analysis with sera of 130 normal children and 15 newborns in Korea revealed specific IgG antibody reaction to 40-55 and 116 kDa protein bands. Forty percent (40.0%) of the 145 sera were positive with any of the antigenic protein bands of R corinii. The positive rate was 56% in 50 males and 33.3% in 48 females. The protein bands 40-55 and 116 kDa from rat P. carinii were confirmed to cross-react with human sera in Korea.

• Electronics and Telecommunications Trends
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• v.25 no.6
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• pp.110-122
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• 2010

UCC, 트위터 등 멀티미디어 콘텐츠 증가, 유틸리티 컴퓨팅과 같은 다양한 신규 서비스의 급증, IPTV 등 높은 대역폭을 요구하는 애플리케이션의 증가, 가상화 데이터 센터의 등장과 함께 40G/l00G 이더넷 기술이 차세대 광대역 서비스 대역폭 요구에 대한 장기적 해결방안의 하나로 제시되고 있는 가운데 세계적으로 40G/100G 이더넷으로의 네트워크의 진화가 시작되고 있다 본 고에서는 최근 세계적으로 뜨거운 쟁점이 되고 있는 차세대 인프라 40G/100G 이더넷 표준을 기반으로 하는 디바이스 및 프로덕트의 출시 동향을 살펴보고 현재 사용 기능한 상용 칩을 이용한 40G 이더넷 라인카드의 구조와 향후 구현 가능한 100G 이더넷 라인카드의 구조 그리고 40G/100G 이더넷 상의 OTN 네트워크 응용에 대해 고찰한다.