• Transactions of the Korean Society of Automotive Engineers
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• v.9 no.6
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• pp.57-64
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• 2001

This study presents an self tuning regulator(STR) to improve the air-fuel ratio control of performance of gasoline engine. The STR is designed based on the nonlinear dynamic engine model, and the performance of the STR is evaluated through the simulation and experiments. The STR shows better performance than a conventional PI controller in terms of the response time and disturbance rejection. Since the STR has less calculation load than the complex nonlinear controller, this algorithm can be easily applied to on-board engine controller.

• Journal of Information Display
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• v.11 no.1
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• pp.24-27
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• 2010

A novel stereo 3D LCD for passive interference filter glasses is presented. A demonstrator based on a standard 120Hz LCD was set up. Stereoscopic image separation was realized in a time-sequential mode using a LED-based scanning backlight with two complementary spectra. A stereo brightness of 3 cd/$m^2$ and a channel separation of 30:1 were achieved.

• Proceedings of the Materials Research Society of Korea Conference
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• 1998.08a
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• pp.58.2-58
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• 1998

• Korean Journal of Microbiology
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• v.54 no.3
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• pp.228-236
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• 2018

The aim of this study was to investigate the distribution of resistance genes in high-level streptomycin resistant Escherichia coli isolated from shellfish collected between April 2015 and March 2016 in Korea. From the 269 E. coli isolates obtained from shellfish samples, a total of 40 streptomycin-resistant isolates with MICs of > $1,024{\mu}g/ml$ were screened and the prevalence of streptomycin resistance determinants was analyzed by PCR. Among the isolates, strA-strB gene structure (77.5%) was the most frequent streptomycin resistance determinant, followed by aadA (30.0%). Six isolates (15.0%) simultaneously contained aadA and strA-strB determinants, whereas three of the isolates (7.5%) did not contain both resistance determinants examined in this work. The difference of MICs between the isolates having the same resistance gene was elucidated by real-time PCR results. The copy number of resistance genes differed considerably among the isolates, which solely harbored an aadA or strA-strB and showed different MICs.

• 한국생물공학회:학술대회논문집
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• 2005.04a
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• pp.210-213
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• 2005

The suppression of apoptosis during the cell culture might increase recombinant protein production. In the present study, the effects of anti-apoptotic agents on the apoptosis of recombinant Chinese Hamster Ovary cells and the production of Iduronate 2-sulphatase(IDS) were investigated Cell density slightly increased when $2{\mu}M$ of EGCG and $10{\mu}g/mL$ of STR-G were added to culture medium after two days. It was observed that the percentage of apoptotic cells was decreased in the culture with STR-G, and Bcl-2 expression level was enhanced in both culture with STR-G and EGCG. These results suggest that G418 and EGCG are effective anti-apoptotic agents for increasing the productivity of IDS with recombinant CHO-DG44.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.4
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• pp.561-571
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• 1993

In this paper, a new discrete Symbol Timing Recovery (STR) algorithm, is proposed. This algorithm is derived from the optimum estimation theory. The algorithm combines the advantages of Mueller and $M\"{u}ller$ algorithm and Gardner algorithm, and avoids some of their shortcomings. The implementation of the new timing detector is simple and the combined operations of Carrier Recovery (CR) -STR is possible because the operation of the new STR is independent of the carrier phase. On the other hand, the behavior of nonlinear characteristics in the new algorithm is analyzed and explained. The performance evaluation is accomplished in detail by numerical calculations and Monte-Carlo simulations. In these respects, this algorithm is similar to Gardner's algorithm, but in tracking performance due to pattern jitter at small rolloff, the proposed algorithm is superior to Gardner's algorithm.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.27 no.5
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• pp.451-458
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• 2014

This study is a practical research for setting a process of making references of design decision and guidlines of limitation in the movement from the design development to the construction design by StrAuto. StrAuto, as a parametric modeling and optimization tool for building structure, enables a quantity of design cases to be analyzed automatically by changing parameters of sturctural properties. So the designer using StrAuto can check a lot of analysis data crossing thousands of cases, see which case is out of acceptable range, and make a decision for design and optimization. In this thesis, the application of StrAuto optimization process to the residence tower UIC project shows the practical applicability in the construction design and value engineering. StrAuto optimized ideally volume of core walls by 31.3% and lead the final revised model applied to the construction design to reduce volume by 18.1%. The significance of this research is the implementation of process that the designer can quickly review a number of cases and get a direction for construction design and optimization after design development.

• Research in Plant Disease
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• v.13 no.2
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• pp.88-92
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• 2007

A total of 41 Pseudomonas syringae pv. syringae, the causal agent of bacterial blossom blight, were isolated from kiwifruit plants in Korea. Among them, two strains showing streptomycin resistance were examined to investigate the structure of resistant determinants by PCR and nucleotide sequence analysis. PCR results suggested that the streptomycin resistance is mediated by strA-strB genes carried on Tn5393a. Insertion sequences, IS6100 and IS1133, which were located within or downstream of tnpR gene in Xanthomonas campestris and Erwinia amylovora were not found. Nucleotide sequences of strA-strB were 100% identical with Tn5393a. Two stretomycin resistant strains had three plasmids. Southern blot hybridization using strA-strB probe indicated that the resistant genes were carried on a 100kb plasmid.

• Biomedical Science Letters
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• v.29 no.4
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• pp.302-313
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• 2023

Y chromosomal short tandem repeat (Y-STR) markers have been developed continuously to complement forensic DNA analyses and population genetic studies. Initially, we collected data from previously reported Korean population Y-STR haplotype studies on 1133 individuals. We then conducted a marker expansion analysis using a dataset from the Y-STR Haplotype Reference Database (YHRD), covering up to 29 Y-STRs, referred to as Ymax. Additionally, we examined the impact of rapidly mutating (RM) Y-STRs included in this expanded marker set on the discrimination capacity. We observed that marker expansions both with (0.9896), and without (0.9510), RM Y-STR improved the discrimination capacity. Subsequently, we focused on 16 individuals belonging to seven distinct groups sharing identical haplotypes. These particular haplotypes had been previously identified among 476 unrelated males using 23 Y-STR markers from the PowerPlex^® Y23 System. We expanded the marker panel up to Ymax to explore how discrimination improved with an expansion of Y-STR markers for these 16 individuals. Among the expanded markers, DYS627, which had high discriminatory power, had a high mutation rate (1.10 × 10^-2) and high gene diversity (0.83). In contrast, DYF387S1 displayed high gene diversity (0.95) but a relatively low mutation rate (2.80 × 10^-3). We propose that these findings will be valuable in the selection of suitable Y-STR markers, depending on the objectives of forensic analyses. Additionally, the presence of frequently observed Y-haplotypes in Korean population will facilitate statistical interpretation in Y-STR DNA profiling.

• Analytical Science and Technology
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• v.29 no.1
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• pp.43-48
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• 2016

A variety of Y-STR analysis kits have been developed and used in the forensic field. Prior to the forensic application of a new kit, laboratory validation and sensitivity tests are essential processes in selecting suitable alternatives and for assuring that standard operating procedures are followed. In this paper, we have performed a sensitivity study of a new commercial kit, the Yfiler^® PLUS PCR Amplification Kit (Yfiler plus kit, released in 2014) by comparing it with the AmpF/STR^® Yfiler^TM PCR Amplification Kit (Yfiler kit, released in 2004). The Yfiler plus kit includes the 17 Y-STR loci of the Yfiler kit and has been supplemented with 10 new Y-STR loci. First, we analyzed the sensitivity difference between the two kits using commercial control DNA 2800M and 007. In addition, we compared the detection rate between the two kits from the 16 selected forensic casework samples of less than 0.5 ng concentrations. The results show that the sensitivity and detection rate of the Yfiler plus kit are higher than the corresponding rates of the Yfiler kit. In addition, we were able to obtain more Y-STR profiles with the use of the new kit. Thus, we suggest that Yfiler plus kit is a more effective forensic tool to detect Y-STR profiles from forensic casework samples of low concentrations.