• Proceedings of the Korean Radioactive Waste Society Conference
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• 2006.06a
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• pp.251-252
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• 2006

원자력발전소는 기체폐기물의 90% 이상을 계획예방정비기간 중에 방출한다. 기체 폐기물 방출은 filter를 거치지 않고 대량 방출하는 고체적 방출과,filter를 거쳐 방출하는 저체적 방출이 있다. 고체적 방출은 방출농도계수가 5842, 저체적 방출은 계수가 183052로 이 이하로 방출만 하면 발전소제한구역(EPB Emergency Planning Zone)에서의 법적허용치 농도 ECL(environmental Control Limit)를 초과하지 않게 된다. 원전에서는 현재 기체방출 시 이 기준치(농도계수)의 1/10을 자체관리 기준치로 하여 적용하고 있다. 실제 울진3호기 4차O/H 시 그 실적을 파악해 본 결과 고체적 방출 시 방출농도계수가 최대 312, 저체적 방출 시는 최대 707을 넘지 않아 허용방출 농도계수와 비교하면 비교가 되지 않을 정도로 낮게 방출하였음을 확인하였다

• The Journal of Korean Institute of Communications and Information Sciences
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• v.8 no.4
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• pp.156-163
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• 1983

A composite DPCM system is designed and implemented for the transmission of a NTSC color TV signal over a 44, 736Mbps channel. It is based on an intra-field fourth-order linear predictor and a nonlinear quantizer of five bits. The predictor preserves both the luminance and the chrominance components through one predictor. To accomodate the speed requirement for real time processing, mainly high speed ECL gates and memory devices are used in the hardware implementation. Experimental results show that this composite DPCM system can be applicable for a practical transmission of color TV signal with CATV quality.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.28A no.5
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• pp.361-369
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• 1991

The optics and the signal processor of dual beam laser Doppler velocimeter(LDV) was fabricated. By using the dual beam and the forward scattering, the optics part of LDV was fabricated. And the signal processor of LDV was designed by the frequency counter type using new 11:6 period timing device in order to remove error signals, and was made of the reference clock of a 500 MHz ECL oscillator. Doppler frequencies from 10KHz to 70MHz can be measured using the signal processor. In the accuracy of the period counting part, from 1.81x10**-4% to 1.27% is estimated, and in the accuracy of the validation logic part, from 0.78% to 14.78% is estimated.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.4
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• pp.1059-1067
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• 1996

A 128/129 dual-modulus prescalar IC is designed for application to frequency synthesizers in high frequency communication systems. The FET logic used in this design is SCFL(Source Coupled FET Logic), employing depletion-mode 1.mu.m gate length GaAs MESFETs with the threshold voltage of -1.5V. This circuit consists of 8 flip-flops, 3 OR gates, 2 NOR gates, a modulus control buffer and I/O buffers, which are integrated with about 440 GaAs MESFETs on dimensions of 1.8mm. For $V_{DD}$ and $V_{SS}$ power supply voltages 5V and -3.3V Commonly used in TTL and ECL circuits are determined, respectively. The simulation results taking into account the threshold voltage variation of .+-.0.2V and the power supply variation of .+-.1V demonstrate that the designed prescalar can operate up to 2GHz. This prescalar is fabricated using the ETRI MMIC foundary process and the measured maximum operating frquency is 621MHz.

• Journal of the Korea Concrete Institute
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• v.19 no.2
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• pp.189-197
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• 2007

Concrete tunnel lining must be designed to having the fireproof performance because the lining are sometimes exposed to very high temperature due to traffic accident. Such fire temperature may cause explosion of concrete, or collapse of tunnel structure. The purpose of this study is to obtain the fundamental fireproof behavior of fire resistance-engineered cementitious composites(FR-ECC) under fire temperature in order to use the fire protection material in tunnel lining system. The present study conducted the experiment to simulate fire temperature by employing 2 types of FR-ECC and investigated experimentally the explosion and cracks in heated surface of these FR-ECC. Employed temperature curve were hydro carbon(HC, ECl) criterion, which are severe in various criterion of fire temperature. The numerical analysis is carried out the nonlinear transient heat flow analysis and verified against the experimental data. The complex features of behavior in fire conditions, such as thermal expansion, plasticity, cracking or crushing, and material properties changing with temperature are considered. By the use of analytical model, the concrete tunnel subjected to fire loads were analyzed and discussed. With comparison of current concrete materials and FR-ECC, the experimental and analytical results of FR-ECC shows the better fire resistance performance than the other.

• Journal of Life Science
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• v.23 no.12
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• pp.1541-1552
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• 2013

The purpose of this study was to investigate the structure and secretory function of the von Ebner's gland in parasympathetic or sympathetic nerve innervation. Sprague Dawley rats were sacrificed 3, 7, 10, 14, and 21 days after bilateral glossopharyngeal or hypoglossal nerve axotomy, respectively. The circumvallate papilla portion of the tongue was dissected and we observed morphological changes in the von Ebner's gland. The properties of glycoconjugate in the von Ebner's gland were investigated using nine biotinylated lectins (PSA, UEA I, GSL I $B_4$, ECL, DBA, SBA, HPA, SJA, or sWGA). Compared with the control group, cytoplasmic vacuoles appeared in the serous acini of the von Ebner's gland in the 3-day group, and the serous acini were significantly vacuolized and degenerated in the 10-day group after glossopharyngeal nerve axotomy. However, the structure of the von Ebner's gland did not change after hypoglossal nerve axotomy. In the control group, the von Ebner's glands secreted glycoconjugates containing ${\alpha}$-D-galactose, N-acetyl-D-galactosamine, and N-acetyl-D-glucosamine oligomer, and the amount of the secretion decreased significantly in the 10-day group after glossopharyngeal nerve axotomy. However, the amount of the glycoconjugate secretion did not change after hypoglossal nerve axotomy. Therefore, the results of this study suggest that the glossopharyngeal nerve containing parasympathetic nerve fibers is important for maintaining the structure of and secretory function in the von Ebner's gland in rats.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.5 no.1
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• pp.26-32
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• 2012

This paper presents a metamaterial absorber unit sell structure with four-element electric-LC resonators (ELC). In order to enhance the operating bandwidth of the proposed absorber unit cell two pairs of ELC resonators with a different size are used. The proposed unit cell shows negative permittivity and permeability when the electric field is parallel to the capacitive gap and the magnetic field is normal to the plane of ELC resonator. The simulated results show peak absorbance over 90% at two frequencies of 8.53 and 9.08 GHz, respectively.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.1312-1315
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• 2002

This research describes the design of a fully integrated fractional-N frequency synthesizer intended for the local oscillator in IMT-2000 system using 0.18-$\mu\textrm{m}$ CMOS technology and 1.8-V single power supply. The designed fractional-N synthesizer contains following components. Modified charge pump uses active cascode transistors to achieve the high output impedance. A multi-modulus prescaler has modified ECL-like D flip-flop with additional diode-connected transistors for short transient time and high frequency operation. And phase-frequency detector, integrated passive loop filter, LC-tuned VCO having a tuning range from 1.584 to 2.4 ㎓ at 1.8-V power supply, and higher-order sigma-delta modulator are contained. Finally, designed frequency synthesizer provides 5 ㎒ channel spacing with -122.6 dBc/Hz at 1 ㎒ in the WCDMA band and total output power is 28 mW.

• Asian Pacific Journal of Cancer Prevention
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• v.14 no.11
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• pp.6241-6243
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• 2013

Objective: To explore the predictive value of tumor markers, including cancer antigen 72-4 (CA72-4), cancer antigen 15-3 (CA15-3) and cancer antigen 125 (CA125), in single or combined detection, for the diagnosis of ovarian cancer. Methods: 120 patients diagnosed with ovarian cancer from August 2011 to March 2013 and 80 patients diagnosed with benign ovarian tumors were enrolled in this test, along with 50 health examination women randomly selected from the database as controls. Serum levels of CA72-4, CA15-3 and CA125 in this study were determined by electrochemiluminescence (ECL). Results: Serum levels of CA72-4, CA15-3 and CA125 in ovarian cancer were higher than those in healthy group and benign group (P<0.01).The sensitivity of combined detection of those three tumor markers for diagnosis of ovarian cancer was obviously higher than with single detection with each marker (P<0.01). Conclusions: CA72-4, CA15-3 and CA125 could be a good combination in the diagnosis of ovarian cancer. Patients whose tumor markers continue to increase should be highly suspected of malignancy.

• Nuclear Engineering and Technology
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• v.32 no.4
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• pp.350-360
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• 2000

In Korea, the dose limits are reduced and are set at the ICRP-60 iimits. However, derived limits tabulated as MPC in air and water are still specified in Notice No.98-12. There are some discrepancies between the primary dose limits and MPCs in air and water. Therefore, in order to accept ICRP-60 recommendations fully, derived limits such as ALI, DAC, ECL for radiological protection against ionizing radiation based on ICRP-60 recommendations were calculated using modified methods of those of 10 CFR part 20, dose limits and committed effective dose coefficients of the Basic Safety Standards of the IAEA. The derived limits in this study were also compared with those prescribed in 10 CFR part 20 as well as MPCs of Notice No. 98-12 in order to analyze the impact of implementing derived limits on nuclear facilities. ECLs in air and water for the control of radioactive discharge into the environment in this study are shown to have lower values (i.e. more conservative), for most part, than those in Notice No. 98-12. Especially, for uranium elements, ECLs in water are approximately a magnitude in the order of two lower than those in Notice No.98-12.