• Journal of Microbiology and Biotechnology
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• v.28 no.7
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• pp.1133-1140
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• 2018

Pseudomonas fluorescens KLR101 was found to be capable of producing polyhydroxyalkanoate (PHA) using various sugars and fatty acids with carbon numbers ranging from 2 to 6. The PHA granules consisted mainly of a poly(3-hydroxybutyrate) homopolymer and/or poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymer. Genomic DNA of P. fluorescens was fractionated and cloned into a lambda library, in which a 5.8-kb fragment that hybridized to a heterologous phaC probe from Ralstonia eutropha was identified. In vivo expression in Klebsiella aerogenes KC2671 (pUMS), restriction mapping, Southern hybridization experiments, and sequencing data revealed that PHA biosynthesis by P. fluorescens relied upon a polypeptide encoded by a 1,683-bp non-operonal ORF, which was preceded by a possible -24/-12 promoter and highly similar to DNA sequences of a gene encoding PHA synthase in the genus Pseudomonas. In vivo expression of the putative PHA synthase gene ($phaC_{Pf}$) in a recombinant Escherichia coli strain was investigated by using glucose and decanoate as substrates. E. coli (${phaC_{Pf}}^+$, pUMS) grown in medium containing glucose accumulated PHA granules consisting mainly of 3-hydroxybutyrate, whereas only a trace amount of 3-hydroxydecanoate was detected from an E. coli fadR mutant (${phaC_{Pf}}^+$) grown in medium containing decanoate. In vitro enzymatic assessment experiments showed that 3-hydroxybutyryl-CoA was efficiently used as a substrate of purified $PhaC_{Pf}$, suggesting that the putative PHA synthase of P. fluorescens utilizes mainly short-chain-length PHA precursors as a substrate.

• Journal of the Korea Institute of Military Science and Technology
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• v.26 no.3
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• pp.227-233
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• 2023

In this paper, to substitute the existing TWTA(Travailing Wave Tube Amplifier) component in small radar system, we developed the Ku band SSPA(Solid-State Power Amplifier) based on the fabrication of power MMIC (Monolithic Microwave Integrated Circuit) chips. For the development of the 500 W SSPA, the 40 W-grade power MMIC was designed by ADS(Advanced Design System) at Keysight company with UMS GH015 library, and was processed by UMS foundry service. And 70 W main power modules were achieved the 2-way T-junction combiner method by using the 40 W-grade power MMICs. Finally, the 500 W SSPA was fabricated by the wave guide type power divider between the drive power amplifier and power modules, and power combiner with same type between power modules and output port. The electrical properties of this SSPA had 504 W output power, -58.11 dBc spurious, 1.74 °/us phase variation, and -143 dBm/Hz noise level.

• Childhood Kidney Diseases
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• v.5 no.2
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• pp.156-163
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• 2001

Purpose We performed urinary mass screening(UMS) program for 2,804 children of second grade elemantary school 8 years of age in Paju city with cooperation of Paju City Health Center to determine the prevalence of asymptomatic proteinuria and hematuria, and to estimate the risk of incipient renal diseases. Also we attempted to evaluate the significance of hematuria in UMS in addidtion to proteinuria. Methods : 2,804 children of the 2nd grade of elementary school who lived in Paju city were included to our UMS program in 2000. They were constituted with 1,428 boys and 1,376 girls. The screening program was carried out in 3 steps The 1st screenig test was performed at schools and then students with abnormal results were examined repeatedly at Paju City Health Center and our hospital. Those students who showed proteinuria and/or hematuria in the 1st and 2nd test were referred to our hospital to undertake the 3rd close examination including physical examination, laboratory tests and radiologic tests. Results : (I) The prevalence of urinary abnormality in the 1st screening test was $8.3\%$(233 students), comprised of $5.9\%$ of boys, $10.8\%$ of girls. (2) Among 2,804 children tested in the first screening, prevalences of asymptomatic proteinuria and isolated hematuria were 64($2.3\%$), 163($5.8\%$) respectively, and the prevalence of proteinuria with hematuria was 6($0.2\%$). (3) Among 233 students with urinary abnormalities at the 1st screening test, 102 students applied to the 2nd test. 32 children, about one third of them, were also found to have abnormal urinary findings ; isolated hematuria 30, proteinuria with hematuria 2. (4) Those findings of clinical evaluation for children with isolated hematuria at the hospital showed as follows: idiopathic isolated microscopic hematuria 21, normal 6, urinary tract infection 1, idiopathic hypercalciuria 1 and simple renal cyst 1. Those 2 students with proteinuria and hematuria seemed to have chronic glomerulonephritis. Conclusion : (1) The clinical evaluation for children who showed positive results at the 1st screening test should be done judiciously. Because of high false positive rate, almost who showed positive results was normal, only a few of them had pathologic conditions. In this study, actual incidence of incipient renal diseases in children of 8 year old was calculated to be $0.4\%$. (2) The definite conclusion whether a urinary mass screening test can alter the prognosis of incipient renal diseases could not be drawn with this study. Further study must be necessary (3) We could acknowledge the significance of hematuria in UMS, but it is necessary that one should be judicious in managing and follow-up those that show abnormal results. (J Korean Soc Pediatr Nephrol 2001;5 : 156-63)

• Journal of Food Hygiene and Safety
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• v.35 no.5
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• pp.430-437
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• 2020

This is an approach study on the sensory properties (taste and odor) of 15 types of Korean conventional soups and stews using electronic nose and tongue. The relative sensor intensity for the taste components of the samples using electronic tongue was demonstrated. By SRS (sourness) sensor, sogogi-baechuguk (beef and cabbage soup) had the highest rate of 9.0. The STS (saltiness) sensor showed the highest score of 8.2 for ojingeoguk (squid soup). For the UMS (umami) sensor, which identifies savoriness, the sogogi-baechuguk was the highest at 10.1. The SWS (sweetness) sensors showed relatively little difference, with sigeumchi-doenjangguk (spinach and bean paste soup) at the highest of 7.3. According to the BRS sensor, which tests for bitterness, the siraegi-doenjangguk (dried radish green and bean paste soup) was the highest at 7.8. By principal component analysis (PCA), we observed variances of 56.21% in principal component 1 (PC1) and 25.23% in PC2. For each flavor component, we observed -0.95 and -0.20 for factor loading of PC1 and PC2 for SRS sensors, 0.96 and 0.14 for STS sensors, and -0.94 and 0.22 for PC1 and PC2 for UMS sensors, and PC1 and 0.22 for PC1 and PC2 loading for SWS sensors. The similarity between the samples identified by clustering analysis was largely identified by 4 clusters. A total of 25 kinds of volatile compounds in 15 samples were identified, and the ones showing the highest relative content in all samples were identified as ethanol and 2-methylthiophhene. The main ingredient analysis confirmed variances of 28.54% in PC1 and 20.80% in PC2 as a result of the pattern for volatile compounds in 15 samples. In the cluster analysis, it was found to be largely classified into 3 clusters. The data in this study can be used for a sensory property database of conventional Korean soups and stews using electronic sensors.

• Electronics and Telecommunications Trends
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• v.17 no.3 s.75
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• pp.41-52
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• 2002

서브 시스템의 구조와 기능 요소 및 관련 신호 프로토콜에 대해 기술하고 있다. IM 서비스란 이동가입자에게 하부에 IP 전송 프로토콜을 기반으로 하는 다양한 형태의 패킷 서비스들을 동시에 제공하는 것을 말한다. 이를 위해 3GPP에서 제시하고 있는 논리적인 ALL IP 망 구조는 IM CN 서브시스템을 포함하고 있는데, IM CN 서브시스템의 중요한 기능 요소로는 Call Session Control Function(CSCF)와 Home Subscriber Server(HSS) 등이 있다. CSCF는 가입자가 위치하고 있는 망에 따라서 가입자의 세션과 서비스를 제어한다. HSS는 가입자의 마스터 데이터베이스로 기존의 3G HLR의 모든 기능과 User Mobility Server(UMS) 기능을 가진다. 본 고에서는 위의 두 기능 요소들의 기능과 상호 간의 시그널링 프로토콜을 최신 동향을 기반으로 분석하고 기본적인 시그널링 절차도 기술한다.

• Electronics and Telecommunications Trends
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• v.17 no.3 s.75
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• pp.53-62
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• 2002

본 논문은 UMTS 기반의 3GPP에서 제안하고 있는 차세대 IP 기반 멀티미디어(IM) 서비스를 위한 핵심망 서브 시스템의 구조와 기능 요소 및 관련 신호 프로토콜에 대해 기술하고 있다. IM 서비스란 이동가입자에게 하부에 IP 전송 프로토콜을 기반으로 하는 다양한 형태의 패킷 서비스들을 동시에 제공하는 것을 말한다. 이를 위해 3GPP에서 제시하고 있는 논리적인 ALL IP 망 구조는 IM CN 서브시스템을 포함하고 있는데, IM CN 서브시스템의 중요한 기능 요소로는 Call Session Control Function(CSCF)와 Home Subscriber Server(HSS) 등이 있다. CSCF는 가입자가 위치하고 있는 망에 따라서 가입자의 세션과 서비스를 제어한다. HSS는 가입자의 마스터 데이터베이스로 기존의 3G HLR의 모든 기능과 User Mobility Server(UMS) 기능을 가진다. 본 고에서는 위의 두 기능 요소들의 기능과 상호 간의 시그널링 프로토콜을 최신 동향을 기반으로 분석하고 기본적인 시그널링 절차도 기술한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1225-1228
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• 2002

이제 인터넷은 우리 실생활에서 기본적인 도구로 이용하게 되었다. 이러한 변화로 기존 음성통화에서 사용되던 OFF-LINE 전화통신이 ON-LINE 상으로 빠르게 대체되어 가고 있다. 이에 따라 음성데이터들을 인터넷망을 통하여 효율적으로 전송하는 기술들이 연구되어 왔고, VoIP 기술은 이러한 시도들에 대한 구체적인 방법론이라고 할 수 있다. 본 논문에서는 문자채팅 및 VoIP 기술을 기반으로 일대일 직접 통화가 가능한 음성채팅 프로그램을 구현하였다. 본 논문은 유무선 통합메시징시스템(UMS)의 기술 진척에 기여할 수 있다.

• Electronics and Telecommunications Trends
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• v.23 no.1 s.109
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• pp.77-88
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• 2008

음성합성 기술은 1990년대 중반 음편접합 방법론이 출현하면서 괄목한 만한 기술적 발전을 이루어, 2000년 전후에는 전화망을 이용한 ARS, VMS, UMS 서비스를 중심으로 폭넓게 사용되면서 일반 사용자들에게 매우 친숙한 서비스를 제공하여 왔다. 그러나 최근 텔레포니 기반의 음성 기술 시장은 기업고객 위주로 그 성장이 더딘 반면, 지능형 로봇, 텔레매틱스, 홈네트워크, 차세대 PC와 같은 전략적 국가 신성장동력 산업분야나 MP3 플레이어, 휴대폰, PMP 단말기, 휴대용 단말기와 같은 임베디드 분야가 음성 기술의 새로운 시장으로 주목을 받고 있다. 임베디드 분야에서 요구하는 음성 기술은 기존 서버급 시스템에서 운영되었던 기술과는 상당히 다른 기술 특성을 가지고 있다. 이에 본 고에서는 음성 기술 중 특히 음성합성 기술에 관한 임베디드 분야의 요구사항을 고찰하고, 이를 해결하기 위한 최근의 기술적 발전 동향 및 응용 사례에 대해서 기술하고자 한다.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1970-1976
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• 2008

Since Daegu subway station fire killed 192 citizens in 2003, the demands about safety MRT operation has been increased. Also, the studies and patents for MRT Surveillance are increasing. The related law and system are improving, too. This study suggests the solution for digital surveillance system that has the functions for restricted zone surveillance, the harmful gas and fire surveillance and abnormal behavior surveillance by comparing and analyzing the surveillance systems of advanced countries (United states, Hongkong, Japan etc). Then, we suggest UMS(Unified Message Service) system and image storing system for effective report and management.

• Journal of information and communication convergence engineering
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• v.21 no.1
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• pp.68-74
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• 2023

This study examines the response of users' feelings from a gender perspective toward interactive video mobile learning (IVML). An IVML prototype was developed for the Android platform allowing users to install and make use of the app for m-learning purposes. This study aims to measure the level of feelings toward the IVML prototype and examine the differences in gender perspectives, identify the most responsive feelings between male, and female users as prominent feelings and measure the correlation between user-friendly feeling traits as an independent variable in accordance with gender attributes. The feelings response could then be extracted from the user experience, user interface, and human-computer interaction based on gender perspectives using the Kansei engineering approach as the measurement method. The statistical results demonstrated the different emotional reactions from a male and female perspective toward the IVML prototype may or may not have a correlation with the user-friendly trait, perhaps having a similar emotional response from one to another.