Streptomyces somaliensis가 생산하는 세포외 Phospholipase D의 유전자 서열 분석과 Transphosphatidylation 활성 특성

정수진,이선희,엄태붕,Jeong Sujin,Lee Sun-Hee,Uhm Tai-Boong 한국미생물학회 2004 미생물학회지 Vol.40 No.3

세포외 phospholipase D (PLD)를 과량 생산하는 균주 JE-11을 토양으로부터 분리하였다. 16S rDNA에 의한 분석과 형태적, 생리적 특성을 조사한 결과 이 균은 Streptomyces somaliensis로 동정되었다. 선발한 S. somaliensis로 부터 PLD를 암호화하는 유전자(sspld) 분리하고 염기서열을 조사하였다. Open reading frame을 분석한 결과 33개의 아미노산으로 이루어진 분비 signal peptide와 505개의 아미노산으로 구성된 PLD단백질을 암호화하는 것으로 예상되었다. 또한, sspld의 염기 서열로부터 유추된 단백질 서열은 기존에 보고된 다른 Streptomyces PLD들과 70-88%의 서열 유사성을 보였다. 이 PLD는 96-98%(㏖/㏖)의 수율로서, Phosphatidylcholine을 glycerol과 serine을 기질로 하여 각각 phosphatidylglycerol 과phosphatidylserine으로 전환을 하였으나, 알코올 공여체인 inositol과 ethanolamine과는 반응하지 않았다. A bacterial strain JE-ll found to produce active extracellular phospholipase D (PLD) was selected from the soil isolates. It was identified as Streptomyces somaliensis on the basis of 16S rDNA sequence analysis, morphological and physiological characteristics. The gene (sspld) encoding S. somaliensis PLD was isolated and characterized. The open reading frame was suggested to encode 538 amino acids with a signal peptide of 33 amino acids. The deduced amino acid sequence of the sspld shared a sequence similarity of 70-88% with PLDs of other Streptomyces sp. so far reported. The PLD converted phosphatidylcholine to phosphatidylglycerol or phosphatidylserine with the yield of 96 to 99% (㏖/㏖), but did not act on inositol or ethanolamine as a transphosphatidylation donor.

모바일 플래시 메모리 수명을 고려한 EXT4 단편화 제거 기법 개선

정수진(Sujin Jeong),강윤지(Yunji Kang),신동군(Dongkun Shin) 한국정보과학회 2017 한국정보과학회 학술발표논문집 Vol.2017 No.12

누리과정 교사용 지도서에 나타난 색채교육 내용 분석

정수진(Jeong, Sujin) 한국색채학회 2018 한국색채학회 논문집 Vol.32 No.4

The purpose of this study was to analyze the contents of color education by extracting education activities which included the color-related factors among the education activities in teacher’s guidebooks of nuri curriculum. After analyzing content of color education activities by dividing into the groups, life theme, section of nuri curriculum, and type of activity, the section of color education were classified into groups, attribute of color, perception of color, emotion of color, imaging of color, and design of color, and it was analyzed. As a result of analyzing color education activities of the teacher’s guidebook of nuri curriculum, the life theme showing color education activities the most frequently were ‘spring, summer, fall, winter’ and ‘environment and life’. The distribution of color related education contents depending on life theme and age was not uniform. The distribution according to the section of nuri curriculum was in the order of nature inquiry, artistic experiences, society inquiry, physical exercise an health, and communication. The distribution according to the type of activity was in the order of free-choice activities, small and large group activities, and outdoor play activities. And color education was performed in art and science activities. Activities content according to section of color education showed the highest level of activity related to perception of color, followed by attributes of colors, design of color, emotion of color, and imaging of color. Thus, when planning color education activities for early childhood, we should consider factors related to color education according to the theme of life and need to diversify across all areas of free-choice activities, small and large group activities, and outdoor play activities in addition to art activities. It is highly valuable that the data resulted from this study provide teachers with excellent basic material for setting up right educational methods for early childhood color education.

색상이 시선 입력 기술에 미치는 영향

정수진(Sujin Jeong),유상봉(Sangbong Yoo),김도현(Dohyun Kim),김동건(Dong gun Kim),전석봉(Seogbong Jeon),장윤(Yun Jang) 한국HCI학회 2018 한국HCI학회 학술대회 Vol.2018 No.1

시선 입력 기술은 몸의 근육을 자유롭게 사용하지 못하는 사용자의 특성상 만족스러운 성능을 요구받는다. 하지만 입력방식을 통한 성능 향상 외의 연구는 찾아보기 힘들며 특히, 시선 입력 장치에서 색상이 미치는 영향에 대한 연구는 찾기 힘들다. 눈은 민감한 기관으로 색상에 따라 피로도, 주목 수준, 색의 잔상과 같은 영향을 쉽게 받을 수 있다. 따라서 본 논문에서는 시선 입력 기술에서 색상이 사용성, 정확도, 속도에 어떤 영향을 미치는지 연구한다.

국내 디클로로메탄 제조·사용 사업장 근로자의 공정별 노출수준에 대한 작업환경측정값과 ECETOC TRA 모델값 비교연구

정수진 ( Sujin Jeong ),배계완 ( Gyewan Bae ),이나루 ( Naroo Lee ) 한국산업보건학회 2021 한국산업보건학회지 Vol.31 No.4

Objectives: By law, companies in Korea must periodically measure workers’ exposure to harmful chemicals (the system is called the Work Environment Monitoring Program (WMP)[a]) and report the results to the government. The government also measures exposure to monitor the WMP’s reliability (called Reliability Assessment (RA) for WMP[b]). The issue is that measured data from these two sources are so different that the objectivity of WMP needs to be confirmed by comparing the results using the European Centre for Ecotoxicology and Toxicology of Chemicals’ Targeted Risk Assessment (ECETOC TRA). Methods: Step 1: Data collection from WMP reports submitted by companies (n=586) and RA for WMP written by the government (n=33). Step 2: Data Standardization by key information included. Step 3: Data conversion to input-variables required to run the ECETOC TRA model, and run the model with specific data (n=514) which meet the predetermined exposure scenario. Step 4: Statistical data analysis by process category (PROC) and ventilation type from each source ([A] and [B]). Step 5: Additional analysis of any unexpected results. Results: The process categories of the production and handling of Dichloromethane were classified into 12 PROCs, and ten of them were selected to run ECETOC TRA. Modeled values tended to be higher than measured values from both sources. For the measured values from WMP, RCR distribution by PROC was narrow (0.197-0.267, 95% CI) and did not have a relationship with ventilation type, which differs from the tendency of the modeling result. Meanwhile, the measured values from RA for WMP were relatively widely distributed (0.301-1.177, 95% CI) by PROC. In particular PROCs (13,19) were high enough to exceed 1. Also, they become low with better ventilation types and appear differently depending on the ventilation type, similar to the model result. Conclusions: This study revealed that ECETOC TRA might have the potential to serve as a screening tool for exposure assessment and to be used as assistive method for WMP to estimate exposure. Further empirical study is required to confirm its availability as a screening tool.

아동의 색채선호도에 관한 기초적 연구

정수진(Jeong, SuJin) 한국색채학회 2016 한국색채학회 논문집 Vol.30 No.4

This study was aimed to analyze the color preference based on the properties of colors for 5th~6th grade elementary school students. To evaluate the color preferences, 18colors, which were composed of 3 achromatic colors (white, grey, and black) and 15 colors generated by combining 5 colors (red, yellow, green blue, and violet) and 3 tones (vivid, light, and dark) for chromatic colors, were used. The data were analyzed using SPSS 21.0 software. The results of this research can be summarized as follows. In the preferences of the chromatic colors, color and tone showed independent effect on color preference. Significant interaction effects gender and color, gender and tone were found. In the preference of color, boys preferred colors in the order of blue, green, yellow, purple, and red. On the contrary, girls have more preference of colors in the order of blue, green, purple, yellow, and red. In the preferences of tone, boys preferred tones in the order of vivid tone and light tone, and girls have more preference of tones in the order of light tone and vivid tone. In the preferences of the achromatic colors, value showed independent effect on color preference. Significant interaction effects gender and value were found. Girls have more preferred white and black colors than boys. And the preference for achromatic colors was highly variable and it was found that white and gray were selected as the most preferred and not preferred colors, respectively. Therefore, the color preference was significantly different depending on the color properties and color and tone were identified as critical factors which affected the color preference. Since color preference is different according to the color properties even in the case of the same color, it was proved that the color property is a crucial factor for the color preference. By analyzing the preferences depending on the color properties, this study will provide the basis for color education for children.

플라즈마 아크 용해 공정으로 자발합성된 질화알루미늄 강화 알루미늄기지 복합재료의 개발

정수진 ( Sujin Jeong ),이제인 ( Je In Lee ),박은수 ( Eun Soo Park ) 한국복합재료학회 2023 Composites research Vol.36 No.2

본 연구에서는 질화알루미늄을 강화재로 갖는 알루미늄기지 복합재료를 질소 분위기에서의 아크용해 공정을 통해 제조하였다. 알루미늄과 질소 원자의 화학반응을 1분간 유지시켰을 때, 중간층과 라멜라층으로 구분되는 질화알루미늄 강화상이 자발적으로 알루미늄 용탕 내부에 형성되어 기지 전반에 분포되었다. 복합재료는 약 10 vol.%의 AlN을 가지며, 이 강화재는 계면에서 낮은 열저항과 강한 결합을 보였다. 제조된 복합재료는 열전도도가 높고 열팽창계수는 낮은 열적 특성 조합을 보였다. 또한, 본 연구의 복합재료는 이종원소인 실리콘을 기지에 첨가함으로써 열팽창계수를 추가적으로 감소시키는 것이 가능했다. 이는 아크 용해법으로 제조된 알루미늄기지 복합재료가 낮은 열팽창계수를 요구하는 방열소재로 적용될 수 있는 가능성을 시사한다. In this study, aluminum nitride (AlN) reinforced aluminum (Al) matrix composites are fabricated via plasma arc melting under a nitrogen atmosphere. Within a minute of the chemical reaction between Al and N, dispersed AlN with the shape of transient and lamellar layers is in situ formed in the Al matrix. The composite contains 10 vol.% AlN reinforcements with low thermal resistance and strong bonding at the interfaces, which leads to the unique combination of thermal expansivity and conductivity in the resulting composites. The coefficient of thermal expansion of the composite can be further reduced when Si was alloyed into the Al matrix, which proposes the potential of the in situ Al matrix composites for thermal management applications.

YOLOv5를 이용한 매장 방문자 인식 방법에 대한 연구

정수진(Sujin Jeong),정유진(Yujin Jeong),노학균(Hakgyun Roh),정관수(Kwansoo Jung) 한국통신학회 2023 한국통신학회 학술대회논문집 Vol.2023 No.6

Dwell-based Time 시선 키보드 입력 기술의 성능 균형 및 향상을 위한 시각화 연구

정수진(Sujin Jeong),유상봉(Sangbong Yoo),김동건(Dong gun Kim),전석봉(Seogbong Jeon),장윤(Yun Jang) 한국컴퓨터그래픽스학회 2017 한국컴퓨터그래픽스학회 학술대회 Vol.2017 No.7

유아기 성장환경과 장내미생물총 발달

정수진 ( Sujin Jeong ) 대한소화기학회 2021 대한소화기학회지 Vol.78 No.1

With its dynamic composition and function, the gut microbiome plays a key role in human development and long-term health. The first 2 years of life are crucial to the early establishment of the gut microbiome. During early life, the gut microbial composition rapidly changes and multiple factors influence the initial colonization, development, and function of the neonatal gut microbiome. In addition, alterations in early-life gut microbial composition linked to necrotizing enterocolitis in infancy, as well as some chronic diseases in later, including obesity, inflammatory bowel disease, cancer, allergies, asthma, and neurological diseases associated with the gut-brain axis. In this review, we focus on both maternal and infant factors known to influence early-life gut colonization. (Korean J Gastroenterol 2021;78:3-8)