• Structural Monitoring and Maintenance
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• 제10권3호
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• pp.243-260
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• 2023

Indonesia has had seismic codes for earthquake-resistant structures designs since 1970 and has been updated five times to the latest in 2019. In updating the Indonesian seismic codes, seismic hazard maps for design also update, and there are changes to the Peak Ground Acceleration (PGA). Indonesian seismic design uses the concept of building performance levels consisting of Immediate occupancy (IO), Life Safety (LS), and Collapse Prevention (CP). Related to this performance level, cases still found that buildings were damaged more than their performance targets after the earthquake. Based on the above issues, this study aims to analyze the performance of base isolation design on existing target buildings and analyze the seismic fragility for a case study in Indonesia. The target building is a prototype design 8-story medium-rise residential building using the reinforced concrete moment frame structure. Seismic fragility analysis uses Incremental Dynamic Analysis (IDA) with Nonlinear Time History Analysis (NLTHA) and eleven selected ground motions based on soil classification, magnitude, fault distance, and earthquake source mechanism. The comparison result of IDA shows a trend of significant performance improvement, with the same performance level target and risk category, the base isolation structure can be used at 1.46-3.20 times higher PGA than the fixed base structure. Then the fragility analysis results show that the fixed base structure has a safety margin of 30% and a base isolation structure of 62.5% from the PGA design. This result is useful for assessing existing buildings or considering a new building's performance.

• 한국식품조리과학회지
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• 제15권3호
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• pp.238-243
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• 1999

보리로부터 전분을 분리하는 공정을 개발하기 위해 blending 처리, ${eta}$-glucanase 처리 및 alkali 처리를 병행한 최적조건을 검토하였다. Blending 처리에 의한 전처리 효과를 조사한 결과 blending 처리를 6회 했을 경우에 전분수율이 29.7%로 나타냈으며 단백질 3.2%, 지방0.7%, 섬유소 0.4%, 회분 0.4%, ${eta}$-glucan 2.8%를 함유한 전분을 분리하였다 단백질과 ${eta}$-glucan의 용출효과를 조사하기 위해 $eta$-glucanase 처리의 최적조건을 검토한 결과 ${eta}$-glucanase 첨가량 60,000 unit, 맥분과 물의 양1/2, 반응온도 $45^{\circ}C$, pH6.5, 침지 6시간 때에 효과적인 용출을 보였다. 전분의 수율증대와 순도를 높이기 위해 0.2% NaOH 용액을 사용한 alkali 처리조건을 조사한 결과 침지 2시간 때에 전분함량은 ${eta}$-glucanase 처리 후의 전분함량과 비교하여 볼 때 25%가 증가한 76.7%(w/w)로 나타났으며 단백질 0.2%, ${eta}$-glucan 0.1%의 최종 전분을 분리하였다.

• 한국전자파학회논문지
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• 제23권9호
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• pp.1042-1047
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• 2012

Marchand 발룬의 평형 단자들의 임피던스 정합과 향상된 격리도 특성을 위한 소형 격리 회로를 설계하였다. 제안한 소형 격리 회로는 Composite Right/Left-Handed(CRLH) 전송선과 CRLH 전송선의 단위 셀을 이용한 소형 위상 반전기로 각각 구성된다. 또한, 이 소형 격리 회로에 대한 설계 방법을 제시하고 분석하였다. 기본적인 격리 회로의 크기인 $0.5{\lambda}_g$에 비해서 CRLH 전송선을 이용한 경우는 $0.11{\lambda}_g$로 소형 위상 반전기를 이용한 경우는 $0.07{\lambda}_g$로 각각 소형화 시켰다. 제안된 소형 격리 회로를 이용한 Marchand 발룬의 동작 주파수는 2.45 GHz이고, 실험을 통하여 검증하였다.

• 제어로봇시스템학회논문지
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• 제15권10호
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• pp.1002-1008
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• 2009

We consider a double faults detection and isolation problem using modified extended parity space approach for inertial measurement unit which use redundant inertial sensors. A redundant IMU which has a hardware redundant is composed of the cone shape because it is good for fault detection and isolation. We analyze the type of double faults and the reason why fault isolation performance is low. We propose modified extended parity space approach method using EPSA and the difference of sensor data.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.344-345
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• 2012

The Gate-Induced-Drain-Leakage (GIDL) current with channel doping and width dependence are characterized. The GIDL currents are found to increase in MOSFETs with higher channel doping levels and the observed GIDL current is generated by the band-to-band-tunneling (BTBT) of electron through the reverse-biased channel-to-drain p-n junction. A BTBT model is used to fit the measured GIDL currents under different channel-doping levels. Good agreement is obtained between the modeled results and experimental data. The increase of the GIDL current at narrower widths in mainly caused by the stronger gate field at the edge of the shallow trench isolation (STI). As channel width decreases, a larger portion of the GIDL current is generated at the channel-isolation edge. Therefore, the stronger gate field at the channel-isolation edge causes the total unit-width GIDL current to increases for narrow-width devices.

• 한국광학회지
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• 제8권2호
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• pp.142-148
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• 1997

분산이 적은 새로운 형태의 광 아이솔레이터 광학계를 제안하였으며, 이의 성능을 이론 및 실험적으로 검증하였다. 본 논문에서 제안한 광 아이솔레이터의 광학계는 2개의 쐐기 형상의 복굴절 소자와 패러데이 회전자, COLLIMATING UNIT, FOCUSING UNIT로 이루어졌다. 파장 1550 nm에서 성능시험 결과 아이솔레이션 40 dB 이상, 상입손실 0.55 dB 이하, 분산 0.02 ps 이하의 결과를 얻었다.

• Journal of Korean Biological Nursing Science
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• 제11권2호
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• pp.114-119
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• 2009

Purpose: The effectiveness of an infection control program is important to hospital quality improvement and decreases of mortality rate and prevalence. Methicillin resistant Staphylococcus aureus (MRSA) is the most common pathogen causing nosocomial infection. The aim of the study was to identify the most important risk factors for acquiring an MRSA, to evaluate the MRSA incidence rates after the nursing intervention in Neurosurgery intensive care unit (ICU). Methods: Clinical data were collected prospectively from December 2008 until July 2009 in Neurosurgery ICU. The patients were divided into preintervention and postintervention groups. An infection was defined as an MRSA if it occurred 48 hr after admission to the Unit. Infection control program including hand washing, education of health care workers about MRSA, standard precaution and contact isolation of patients were applied for three month. Results: A total of 85 patients were included in the study. Forty-five patients of S. aurerus were detected. Among 45 of S. aurerus, MRSA were isolated from 38 patients. The incidence MRSA rate of postintervention group was 26.9% while incidence MRSA rate of preintervention group was 66.7%. In total, The incidence MRSA rate was 44.7%. The incidence of MRSA have decreased in the postintervention as compared with the preintervention group. Conclusion: The infection control program for MRSA was effective to decrease the MRSA isolation rate. The health care workers regular hand washing, education of nosocomial infection control is important enough to be emphasized.

• Journal of Microbiology and Biotechnology
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• 제26권5호
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• pp.854-866
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• 2016

The production cost of biodiesel from microalgae is still not competitive, compared with that of petroleum fuels. The genetic improvement of microalgal strains to increase triacylglycerol (TAG) accumulation is one way to reduce production costs. One of the most promising approaches is the isolation of starch-deficient mutants, which have been reported to successfully increase TAG yields. To date, such a stable mutant is not available in an oleaginous marine microalga, despite several advantages of using marine species for biodiesel production. Algae in the genus Dunaliella are known to tolerate high salt concentration and other environmental stresses. In addition, the cultivation processes for large-scale outdoor commercialization have been well established for this genus. In this study, Dunaliella tertiolecta was used to screen for starch-deficient mutants, using an iodine vapor-staining method. Four out of 20,016 UV-mutagenized strains showed a substantial reduction of starch content. A significantly higher TAG content, up to 3-fold of the wild-type level, was observed in three of the mutants upon induction by nitrogen depletion. The carotenoid production and growth characteristics of these mutants, under both normal and oxidative stress conditions, were not compromised, suggesting that these processes are not necessarily affected by starch deficiency. The results from this work open up new possibilities for exploring Dunaliella for biodiesel production.

• Archives of Pharmacal Research
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• 제20권6호
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• pp.633-636
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• 1997

In the course of searching for PAF receptor antagonists, pregomisin (1) and chamigrenal (2) were isolated from the fruits of Schizandra chinensis Baill by the bioactivity-guided isolation. Both compounds showed PAF antagonistic activity and the $IC_{50}$ values were $4.8{\times}10^{-5} M and 1.2{\times}10^{-4}M,$ respectively. In addition, the $^{13}C$ NMR assignments of 1 and 2 using DEPT, HMQC, COLOC and HMBC were reported for the first time.

• 약학회지
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• 제41권4호
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• pp.433-438
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• 1997

MT 51005 as a potent inhibitor of phospholipase C(PLC) was purified from the culture broth of a fungal strain No. 51005 isolated from soil. It was identified as a benzaldehyde d erivative, anguillosporal. by the physico-chemical properties and spectroscopic data. Anguillosporal showed the inhibitory activity against purified PLC with an $IC_{50}\;of\;13{\mu}g/ml$. And it also inhibited the formation of inositol phosphates($IP_t$) in platelet-derived growth factor(PDGF)-stimulated $NIH3T3{\gamma}1$ cells with an $IC_{50}\;of\;0.8{\mu}g/ml$.