• 한국정보통신설비학회:학술대회논문집
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• 2006.08a
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• pp.95-98
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• 2006

본 논문의 목표는 지상파 디지털 방송과 데이터 방송 그리고 아날로그 방송을 수신할 수 있는 DTV Set를 구현하고 일체형 디지털 방송 수신기에서 아날로그 방송과 영상을 입력받았을 때 화질저하의 원인이 되는 De-interlace 알고리즘과 3-D Noise를 적절하게 제거할 수 있는 알고리즘에 관한 연구가 목표이다. 또한, 디지털방송의 수신된 컨텐츠를 다른 저장매체로 불법적으로 복사, 재생을 막기 위한 디지털 컨텐츠복사를 방지할수 있는 알고리즘에 관한 연구이다. 현재, 우리나라에서는 기존의 아날로그 방송과 고품질 디지털 방송 서비스를 위한 디지털 방송이 시험적으로 실시되고 있는 상황이다. 이러한 환경하에서 디지털 방송 수신만을 위한 수신기는 아직 시기상조이며 아날로그 방송과 디지털 방송을 동시에 수신할 수 있는 일체형 수신기가 필요한다. 일체형 수신기에서 가장 문제가 되는 부분이 아날로그 방송을 수신하여 디지털 영상으로 인코딩한 후 화면에 뿌려 줄 때 Even Field와 Odd Field를 분리하여 뿌려주기 때문에 많은 영상의 열화가 발생하게 된다. 이러한 문제를 해결하기 위한 많은 방법들이 연구되고 있는 실정이다. 본 연구에서 사용된 시스템을 간략하게 소개하면 디지털 방송 수신을 위한 SoC 로는 Zoran의 G9 Ellete 채택하였고 아날로그 영상의 Decoder로는 AMI의 ADV7401을 선택하였다. 이에 대한 Operating System는 Real-Time OS인 Thread-X를 선택하였다.

• Applied Biological Chemistry
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• v.45 no.4
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• pp.190-194
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• 2002

Expression of Bacillus subtilis glutamyl-tRNA synthetase (GluRS) in Escherichia coli is lethal for the host, probably because this enzyme misaminoacylates ${tRNA_l}^{Gln}$ with glutamate in vivo. In order to overexpress B. subtilis GluRS, encoded by the gltX gene, in E. coli, this gene was amplified from B. subtilis 168 chromosomal DNA using PCR method and the entire coding region was cloned into a pET11a expression vector so that it was expressed under the control or the T7 Promoter. The resulting recombinant pEBER plasmid was transformed into E. coli Novablue (DE3) bearing the T7 RNA polymerase gene for expression. After IPTG treatment, the overproduced enzyme was purified using ammonium sulfate fractionation, Source Q anion exchange chromatography, Superdex-200 gel filtration, and Mono Q anion exchange chromatography. The purified enzyme yielded 18-fold increase in specific activity over the crude cell extract and its molecular weight was approximately 55 kDa on SDS-PAGE.

• Journal of the Korean Society of Radiology
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• v.85 no.1
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• pp.109-123
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• 2024

Xanthogranulomatous (XG) inflammatory disease is a rare benign disease involving various organs, including the gallbladder, bile duct, pancreas, spleen, stomach, small bowel, colon, appendix, kidney, adrenal gland, urachus, urinary bladder, retroperitoneum, and female genital organs. The imaging features of XG inflammatory disease are nonspecific, usually presenting as a heterogeneous solid or cystic mass. The disease may also extend to adjacent structures. Due to its aggressive nature, it is occasionally misdiagnosed as a malignant neoplasm. Herein, we review the radiological features and clinical manifestations of XG inflammatory diseases in various organs of the abdomen and pelvis.

• Journal of Dental Rehabilitation and Applied Science
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• v.27 no.3
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• pp.253-265
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• 2011

When restoring endodontically treated teeth is the mismatch between fiber post size and post space diameter, the resin cement layer is excessively thick in post space and voids are likely to form in it, thus predisposing to de-bonding. The method to overcome this problem is to reline the fiber post with composite resin. This individual anatomic post improves the adaptation of post to root walls and decreases the resin cement thickness. The purpose of this in vivo study was to evaluate the push-out bond strength of fiber post according to relining procedure and luting agents type used for simplicity of clinical procedure. Forty-two extracted teeth were divides into six groups.(n=7) A1: relined fiber post cemented with Luxacore/all-bons 2, A2: non-relined fiber post cemented with Luxacore/all-bond2, B1: relinind fiber post cemented with Calibra/XP-bond, B2: non-relined fiber post cemented with Calibra/XP-bond, C1: relined fiber post cemented with RelyX Unicem, C2: non-relined fiber post cemented with RelyX Unicem Push-out bond strength was affected by interaction between relining procedure and luting agent type. Relined fiber post presented higher push-out bond strength value than non-relined fiber post and statically significant differences(p<0.05) Cementation with RelyX Unicem showed significantly higher bond strength than other luting agents(p<0.05).

• Journal of Mechanical Science and Technology
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• v.19 no.4
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• pp.968-975
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• 2005

The shearing process for the sheet metal is normally used in the precision elements such as semi-conductor components. In these precision elements, the burr formation brings a bad effect on the system assembly and demands the additional de-burring process, so this imposes high cost on manufacturing. In this paper, we have developed the in-situ auto-aligning precision meso-punching system to investigate the burr formation mechanism and ultimately minimize burr. Firstly, we introduced the punch-die contact sensing method to align the punch and the die at initial state prior to the punching process. Secondly, by using the low-price semi-con­ductor laser, burr formed on the edges is measured intermittently during the punching process. We could, finally, make burr on the sheet metal uniformized and minimized by controlling of the precision X - Y table, $1\;{\mu}m$ resolution, and measuring burr height by semiconductor laser. Experimental results show the validity of our system for pursuing the burr-free punched elements.

• Proceedings of the IEEK Conference
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• summer
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• pp.23-26
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• 2004

Five-port reflectometer which consists of a ring with 5 arms (two inputs, three outputs) and three RF power detectors has been used as a vector network analyser, a demodulator in the homodyne receiver as well as in Phase Looked Loop (PLL) and so on. Calibration of five-port reflectometer is an important task. In this paper, we present a calibration method of five-port for a propagation channel sounder. The method is based on measurement of the phase differences between the three voltages at the five-port's outputs in order to determine the ratio of two input incident waves. The frequency channel sounder based on five-port is calibrated for each frequency from 2.2 GHz to 2.6 GHz with 1 MHz step. This method can also determine the absolute delays of each propagation path in the propagation channel. The calibration method is validated using measurement data.

• Structural Monitoring and Maintenance
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• v.5 no.2
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• pp.231-242
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• 2018

Subway tunnel structure has been rapidly developed in many cities for its strong transport capacity. The model-based damage detection of subway tunnel structure is usually difficult due to the complex modeling of soil-structure interaction, the indetermination of boundary and so on. This paper proposes a new data-based method for the damage detection of subway tunnel structure. The root mean square acceleration and cross correlation function are used to derive a statistical pattern recognition algorithm for damage detection. A damage sensitive feature is proposed based on the root mean square deviations of the cross correlation functions. X-bar control charts are utilized to monitor the variation of the damage sensitive features before and after damage. The proposed algorithm is validated by the experiment of a full-scale two-rings subway tunnel lining, and damages are simulated by loosening the connection bolts of the rings. The results verify that root mean square deviation is sensitive to bolt loosening in the tunnel lining and X-bar control charts are feasible to be used in damage detection. The proposed data-based damage detection method is applicable to the online structural health monitoring system of subway tunnel lining.

• Resources Recycling
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• v.30 no.2
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• pp.46-52
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• 2021

Off-grade Ti generated from smelting and mechanical processing has a high oxygen content. In this work, off-grade Ti was deoxidized using Mg and a chloride mixture as the reductant and flux, respectively. The experiments were conducted in the α-Ti temperature range (1,023~1,123 K) and the effects of the reaction time, reaction temperature, quantitiy of Mg and chloride ratio on deoxidation were investigated. Notably, when YCl3 is used as the flux to react with MgO, it is possible to reduce the activity of MgO. Therefore Ti can be deoxidized using Mg. In this study, the O content was decreased from 0.5 wt% to 0.1004 wt% at 1073 K, for 6 hours, with Mg=3.6 g and $X_{YCl_3}=0.22$.

• Journal of Yeungnam Medical Science
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• v.15 no.2
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• pp.341-349
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• 1998

The purpose of this study was to investigate the effects of regular treadmill running on GLUT4 protein of skeletal muscle in STZ-diabetic rats. I used 19 male Sprague-Dawley rats weighing 140 to 160 grams. Rats were randomly assigned into normal, diabetes(DM) and DE(DE) groups. The exercise was loaded with treadmill running for 5 days per week during 4 weeks. All experimental procedures were carried out following overnight fasting 48 hours after last exercise. Gain(gm) in body weight in DM rats(822.4) was lowered compared to normal rats(1092.8), and decreased by exercise. Plasma glucose concentration(mg/dl) in DM rats was 1433.1 which is higher than that of normal group of 1036.4. The concentration of DE group was lower than that of DM rats. Plasma insulin concentration(${\mu}U/ml$) of DM and DE rats was significantly lowerd compared to normal rats. There was no difference of plasma concentrations of FFA and HDL cholesterol among noraml, DM and DE groups. Plasma triglyceride concentration(mg/dl) was significantly highered in DM group compared to those of DM group, the concentration of DE group was lower. Glycogen concentration(mg/gm wet weight) of the plantaris muscle in DM and DE groups was significantly reduced compared to normal group. Glucose transporter 4(GLUT4) protein of soleus was analyzed by Western blot. In DM group, the GLUT4 protein level was markdly decreased compared to normal group, but the level was recovered to the level of normal group by 4 weeks treadmill running. In conclusion, the insulin resistance induced by STZ administration was partially improved by 4 weeks physical training in rats.

• Journal of Korean Public Health Nursing
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• v.29 no.1
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• pp.53-66
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• 2015

Purpose: This study was considered in order to identify the factors affecting healthcare utilization by Asian immigrants in the United States. Methods: From February to April 2011, a descriptive survey study was conducted in a convenience sample of 250 Korean and Asian Indian immigrants aged between 40 and 64 in the Triangle area of North Carolina. An author-developed instrument was used to assess predisposing, enabling, and need factors according to Anderson's Behavioral Model of Health Services. Utilization Data analysis was performed by $X^2$-test, t-test, and binary logistic regression. Results: Participants' healthcare services experiences were significantly different when they had a longer stay in the U.S., had been employed, had higher income, were Asian Indians, had better English-speaking skills, better health status, more knowledge of health system and health insurance, had higher satisfaction with the healthcare system, and when they were taking prescribed medications and having health insurance. The strongest association with experience of healthcare services was having health insurance with an adjusted odds ratio (OR) of 15.37 (95% CI 4.95-47.71, p<.001) and self-reported English proficiency (OR=1.99, 95% CI 1.00-3.96, p=.05). Conclusion: Intervention strategies to increase accessibility to healthcare services should focus on these significant predictors.