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최건영,고성화,김종옥,박은서,김완규,백경동,박동규 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2
The Internet of Things, the core of the Fourth Industrial Revolution, is growing by incorporating various technologies into various fields. Among them, smart home systems that apply IoT technology to home environments are being actively studied. The home hub market, a means of communication for smart homes, is also developing at the same time. As the home hub market develops, security threats are also increasing accordingly. In this paper, 'Smart Home Mirror' is implemented by combining mirror and IoT technologies so that users can use them to communicate with smart home applications and other devices. To meet security issues, users in it are recognized by using face recognition technology and AES between all data communications in it is applied. The proposed device’s usefulness is approved by implementing it in smart home environments.
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여수국가산업단지 인근 지역 대기오염물질 농도에 영향을 미치는 요인분석
김민영,변정훈,이영훈,이건영,한지은,이예림,임지현,장봉기 순천향대학교 기초과학연구소 2022 순천향자연과학연구 논문집 Vol.28 No.1,2
Eight monitoring stations in the Yeosu National Industrial Complex will determine the concentration of air pollutants measured every hour in 2019, analyze what factors affect them, and how they correlate with the air pollutant measurements. Six air pollutants (SO2, NO2, O3, CO, PM-10 and PM-2.5) measured at eight monitoring stations around Yeosu National Industrial Complex (Seogang-dong, Wolnae-dong, Munsu-dong, Yeocheon-dong, Deokchung-dong, Hwayang-myeon, Yulchon-myeon, Samil-dong) the measurement data for each hour of the year were downloaded to analyze the concentration by weather condition, time zone, season, separation distance from Yeosu Industrial Complex, and separation distance from Gwangyang Industrial Complex. SO2, NO2, and CO concentrations were significantly higher in winter, significantly lower in summer, and O3, PM-10, and PM-2.5 concentrations were significantly higher in spring. SO2, CO, PM-10, and PM-2.5 concentrations were significantly higher between 10 a.m. and 12 p.m., NO2 concentrations were significantly higher between 7 a.m. and 9 a.m., and O3 concentrations were significantly higher between 13 p.m. and 15 p.m.(p<0.001). The concentration of air pollutants (SO2, NO2, CO, PM-10, PM-2.5) excluding O3 was found to have a negative (-) correlation with weather condition, and in the case of O3, it was found to have a positive (+) correlation with PM-10, PM-2.5, temperature and wind speed. It was confirmed that the concentration of air pollutants emitted from the Yeosu National Industrial Complex differs depending on the season, time and distance to the industrial complex. This study aims to establish measures to minimize health damage to residents living relatively close to the industrial complex and contribute to the establishment of management and response measures according to the properties of substances to reduce the concentration of air pollutants in the future.
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박인건,전영국 順天大學校 師範大學 附屬 科學敎育硏究所 1999 科學과 敎育 Vol.7 No.-
This study focuses on describing and interpreting various phenomena occurred in an elementary school after a separate computer education curricula driven by private company has ended. The major thrusts of carrying out qualitative study in this case were laid out on the dimensions of practical teacher, private computer lecturer and participating elementary students. Research methodology was adopted from the attempts to describe various images and computer classroom activities to come up with subjective interpretations from an empathetic teacher as a researcher. The participants include a principal, a private computer lecturer, a computer teacher and three elementary students. The main research agendas cover various phenomena occurred between a computer teacher and students such as students' attitudes according to teaching methods, question and answers, the degree of satisfaction on computer curricular, a teacher's classroom management and control methods. By adopting a qualitative method, the researcher tried to get into the deep levels of interaction patterns between a teacher and students and tried to interpret those patterns from empathetic eyes of the researcher. This research design was carried out mostly from August of 1999 to September of 1999 by taking interviews and video tapes with the research participants. Interview data were transcribed and video tapes were coded according to time lines and the sequences of activities taken place in the computer room.
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이용근,이건일,박영준,변호영 원광대학교 생체재료·매식연구소 1995 원광생체재료·매식 Vol.4 No.2
To investigate the effect of high dose irradiation on the mechanical properties. dental acrylic resin specimens were irradiated and the Vickers hardness number(VHN) and the 3-point flexure strength(FS) were measured before and after irradiation. Five kinds of acrylic resins were studied. Two(VRS. PS2) were heat cured denture base resins. one(VSC) was chemically cured denture base resin and the other two(ORJ, VOP) were orthodontic resins. The acrylic resin specimens were made according to the manufacturer's instructions and were finally polished with Microcloth (Buehler). Among ten specimens of each material. five specimens were irraditated with 100 Gy using a linear accelerator (Mitsubishi 6 MV), and the others were not. The specimens were immersed in 37℃ D.W. for 48 hours before testing. Each specimens the VHN was measured 10 times. Their FS was measured with an universal testing machine (Instron 4302, England), with a cross-head speed of 5 mm/min. The VHNs of heat cured resins were 21.52∼25.55 kg/㎟ before irradiation and 19.93∼26.58 kg/㎟ after irradiation. Those of chemically cured resins were 11.28∼16.6kg/㎟ before irradiation and 11.3∼14.3 kg/㎟ after irradiation. The VHNs of heat cured acrylic resins were significantly higher than those of chemically cured resins were significantly higher than those of chemically cured resins before and after irradiation(p<0.05). VHN of VRS was significantly increased after irradiation, and those of VOP and PS2 were significantly decreased after irradiation (p<0.05). The FS of resins studied were 6.7∼8.0 kg/㎟ before irradiation and 6.5∼8.4 kg/㎟ after irradiation. The FS of VSC and VRS increased after irradiation and those of VOP, ORJ and PS2 decreased after irradiation, but the results were not statistically significant. Before irradiation, the FS of heat cured resins were somewhat higher than those of chemically cured resin, but not statistically significant, and after irradiation the FS of heat cured resins were significantly higher than those of orthodontic resins. In conclusion. high dose irradiation did not result in consistent changes in mechanical properties.
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PCR을 이용한 국내시장에 유통중인 유전자재조합 콩 및 가공식품의 모니터링
김묘영,김재환,김현중,박선희,우건조,김해영 한국응용생명화학회 2003 Applied Biological Chemistry (Appl Biol Chem) Vol.46 No.4
본 연구에서는 PCR을 이용하여 국내시장에 유통중인 원료콩과 가공식품에 epsps 또는 pat 유전자가 삽입된 유전자재조합 콩(GMS)의 사용여부를 모니터링하였다. 이러한 GMS의 검출을 위해 3쌍의 primer set을 제작하였고, 각각의 primer들은 GMS에 삽입된 유전자와 특이적으로 반응하여 PCR산물을 생성하였다. 2001년 표시제가 시행되기 이전에 생산된 총 가공식품과 이후의 제품에 대해 각각 모니터링을 수행하였으며, 표시제 이전에 생산된 제품의 경우 대부분의 미국산 원료에서 esps가 삽입된 GMS가 검출되었으나, 표시제 이후에는 검출되지 않았다. A method using PCR was developed for the monitoring of genetically modified soybean (GMS) and GMS derived foods utilized in the market. We designed 3 pairs of specific oligonucleotide primers based on epsps and pat inserted in GMS and ferritin gene as internal standards. Template DNAs isolated from soybean and processed foods were used for multiplex PCR with 3 primer sets. PCR, used with specific primer sets for GMS detection, showed the amplified DNA fragments with GMS template DNA. In this study, GMS containing epsps was detected from soy processed foods manufactured before GM food labeling system, however, GMS containing epsps or pat was not detected from soy processed foods manufactured after GM food labeling system.
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( Yeong Geon Lee ),( Jae Woong Hwang ),( Sang Bum Park ),( Il Seob Shin ),( Soo Kyung Kang ),( Kwang Won Seo ),( Yong Soon Lee ),( Kyung Sun Kang ) 한국조직공학·재생의학회 2008 조직공학과 재생의학 Vol.5 No.4
Therapy using stem cells for the liver fibrosis is a prospective alternative to overcome the insufficiency of transplantable liver donor. Here, we demonstrated xenogeneic human cell therapy for the treatment of rat liver fibrosis without the use of an immunosuppressant. Liver fibrosis was induced by dimethylnitrosamine for 5 weeks in six-week-old male Sprague-Dawley rats. Human umbilical cord blood- and adipose tissue-derived multipotent stem cells were injected intravenously by the tail vein after one week. Blood samples were collected and liver samples were stained with Masson`s trichrome in order to evaluate the amount of fibrosis. After the cell injection, the level of total protein, albumin, alanine transaminase and aspartic acid transaminase was recovered to the similar level of the normal rats. The liver weight per body weight increased after the cell injection. Collagen fiber, near the portal triad and marginal region, was reduced, significantly. Taken together, it is suggested that xenotransplantation of multipotent stem cells might be a candidate for the treatment of liver fibrosis without the use of an immunosuppresant.
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( Yeong Geon Kim ),( Kwang Jae Lee ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Impedance baseline measurements can be used to evaluate changes in the integrity of the esophageal mucosa, and baseline impedance is found to be correlated with transepithelial resistance. The aim of this study was to investigate factors infl uencing on esophageal baseline impedance levels in patients with suspected symptoms of GERD. Methods: Consecutive endoscopy-negative patients with suspected symptoms of GERD (heartburn, chest pain, and/or globus) who underwent 24h esophageal multichannel intraluminal impedance-pH (MII-pH) monitoring were eligible for inclusion in this study. Patients were excluded if they were taking medication which could infl uence esophageal motor function or gastric acid secretion, or if they had erosive esophagitis on endoscopy, or a history of upper gastrointestinal surgery. Baseline impedance values in each individual were measured in the proximal esophagus and the distal esophagus at 5 min before meal, 5 min, 30 min after meal, 30 min before sleep, 30 min, 60 min after sleep. Each single baseline value represents the average value of a 30-s time period around each time point avoiding swallows, refl uxes, and pH drops. Results: Fifty patients were included in the study. Baseline impedance levels at 5 min after meal were signifi cantly lower in the proximal (p<0.001) and distal esophagus (p<0.001), compared with those at 5 min before meal. Signifi cantly lower baseline impedance levels were observed at 30 min (p<0005) and 60 min (p<0.005) after sleep in the proximal esophagus, compared with those at 30 min before sleep, but not in the distal esophagus. Baseline impedance levels in patients with pathological acid refl ux (n=12) and pathological bolus refl ux (n=15) were signifi cantly lower in the distal esophagus. Conclusions: Meal ingestion, sleep, pathological acid reflux and pathological bolus refl ux appear to infl uence on esophageal baseline impedance levels.
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