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컴퓨터 작업 시 의자 등받이 위치가 근육 활성도에 미치는 영향
김민우,변승진,이경은,정소영,조주영,최원자,최찬양,김경 대구대학교 특수교육재활과학연구소 2011 再活科學硏究 Vol.29 No.1
이 연구는 컴퓨터 작업시 의자 등받이 위치가 근육활성도에 미치는 영향을 알아보기 위해 36명의 근골격에 문제가 없는 성인 남녀가 참가하였으며 대상자들은 등받이가 뒤에 있는 의자와 등받이가 없는 의자, 등받이가 앞에 있는 우리들 의자를 무작위로 배정하고 동일한 컴퓨터 작업을 실시하게 하였다. 실험 중, 표면근전도기를 사용하여 의자에 따른 위등세모근, 머리널판근 그리고 척주세움근의 근활성도 변화를 측정하였다. 이 연구의 결과를 종합해보면 등받이가 앞에 있는 의자는 허리 근육의 부담을 줄이지만 목근육에 부담이 늘어나고 등받이가 뒤에 있는 의자와 없는 의자는 허리근육에는 다소 무리가 가지만 목근육에는 부담이 덜하다는 것을 알 수 있었다. 이러한 결과로 환자의 증상에 다라 컴퓨터 작업을 하는 동안 의자 등받이의 위치를 조절하여 치료에 도움이 될 수 있다고 생각되어진다. Objective : In this study, we checked and observed people's change of body muscle and muscle activity who do computer work on different chairs. We set three kind of chairs which one is a stool and another one is the back is fixed, and the other one is the back is fixed in front of chair. Subject : Accounting for 36 health men and women, we divided these people to 3 groups and put them on the three cases(position 1, position 2, position 3). We measured muscle activity of upper trapezius, Splenius Cervics, Erector Spinae from the groups by using surface electromyogram system. Methods : The standard of the electromyogram was 'reference voluntary contraction', and we carried out 'one way anova' to compare muscle activity of three groups. Results : In position 1, reference voluntary contraction of upper trapezius muscle activity was 123.2821%, Splenius Cervics was 141.7526%, and Erector Spinae was 254.5233%. In position 2, reference voluntary contraction of upper trapezius muscle activity was 132.9395%, Splenius Cervics was 141.7526%, and Erector Spinae was 246.6540%. In position 3, reference voluntary contraction of upper trapezius muscle activity was 190.6487%, Splenius Cervics was 270.2332%, and Erector Spinae was 182.1021%. Both upper trapezius and Splenius Cervics muscle activity of position 3 group was higher than the others groups. In position 1 group, Erector Spinae muscle activity was hight than the other groups. And either was position 2 group's(p<0.05). Conclusion : Therefore the chair which is the back is fixed in front is more comfortable for waist muscle but it's not good for neck. And the other chairs are better in waist muscle but not in neck muscle. So far, when we do a computer work, it's prefer to sit on the group 1&2's chairs to reduce neck muscle's stress and sit on group 3's chair to reduce waist muscle's stress.
김(Porphyra sp.)에서 추출한 PDRN (polydeoxyribonucleotide)의 나일틸라피아(Oreochromis niloticus)에서의 상처 치유 효과
양찬영 ( Chan Yeong Yang ),한지성 ( Ji Sung Han ),이원세 ( Won Se Lee ),배준성 ( Jun Sung Bae ),이채원 ( Chae Won Lee ),정은하 ( Eun Ha Jeong ),김관희 ( Gwan Hui Kim ),박관하 ( Kwan Ha Park ) 한국어병학회 2021 한국어병학회지 Vol.34 No.2
Polydeoxyribonucleotide (PDRN)은 특정 adenosine 수용체에 작용하여 상처 치유 과정을 촉진하는 것으로 알려져 있다. 지금까지 어류의 조직에서 얻어진 PDRN과는 다르게, 최근 해초류인 Porphyra로부터 추출된 PDRN이 개발되었다. 본 연구는 나일틸라피아(Oreochromis niloticus)에서 인공적으로 피부의 상처를 유발한 뒤 Porphyra에서 추출한 PDRN을 이용하여 상처 치유 효과를 평가하였다. 상처의 회복은 시험 시작 후 1주내에는 일부만 회복되었지만, 2주내에 거의 완전히 회복되었다. 상처를 유발하기 전 PDRN을 10 및 20 mg/kg의 용량으로 5일간 사료로 투여한 후 상처 치유 효과를 관찰하였다. 상처 치유 효과는 육안적, 면적 및 색도 측정으로 평가하였다. 본 연구에서 관찰된 Porphyra 유래의 PDRN에 의한 상처 치유 효과는 다양한 원인에 의해 발생하는 어류의 상처 치유 목적으로의 활용 가능성을 보여준다. Polydeoxyribonucleotide (PDRN) is known to accelerate wound healing process by acting on specific adenosine receptors. Differently from the PDRN substances obtained so far from piscine tissues, unique PDRN was prepared recently from Porphyra, a seaweed species. In this study, effects of the Porphyra PDRN was evaluated by inducing artificial skin wounds in Nile tilapia Oreochromis niloticus. The wound recovered almost completely in 2 weeks without any treatment, however only a partial recovery was done after one week. Facilitated healing was observed by PDRN fed for 5 days before wound induction at 10 or 20 mg/kg, against the partially recovered 1-week old wound. The healing effects were identified not only by visual observation, wound area measurement, but also by colorimetric estimations. These novel wound healing effects suggest beneficial therapeutic utility of Porphyra-derived PDRN for wound treatments in fishes occurring from various causes.
과학 학습 과정에서 나타나는 중간언어의 유형 및 과학 언어에 대한 이해수준 변화에 따른 중간언어의 특징
양찬호 ( Chan Ho Yang ),김지영 ( Ji Yeong Kim ),신필여 ( Pil Yeo Shin ),위햇님 ( Hat Nim We ),신명환 ( Myung Hwan Shin ),강도영 ( Do Young Kang ),김소요 ( So Yo Kim ),민현식 ( Hyun Sik Min ),김찬종 ( Chan Jong Kim ),노태희 ( Tae H 한국과학교육학회 2011 한국과학교육학회지 Vol.31 No.5
이 연구에서는 중학교 3학년 학생들이 물리변화와 화학변화를 나타내는 현상을 구분하고 설명하는 과정에서 사용하는 중간언어를 집단토의 활동과 사후면담을 통해 조사하였다. 학생들이 사용한 언어를 귀납적으로 분석하여 중간언어의 유형을 분류하고, 과학 언어에 대한 이해수준의 변화에 따른 중간언어의 특징을 조사하였다. 연구 결과, 학생들의 중간언어는 그 의미와 형태에 따라 세 가지 유형으로 나타났다. 중간언어 유형 1은 과학적 의미를 나타내기 위해 과학 언어와 일상 언어를 함께 사용하는 언어 사용 방식으로, 과학 언어에 대한 이해수준 변화와 관련 없이 대부분의 학생들이 사용하는 것으로 나타났다. 중간언어 유형 2는 과학적 의미를 나타내기 위해 일상 언어만을 사용하는 언어 사용 방식으로, 과학 언어에 대한 이해 가 높은 학생들에게서만 나타났다. 중간언어 유형 3은 언어를 다중적인 의미로 사용하는 언어 사용 방식으로, 과학 언어에 대한 피상적 이해를 지닌 학생들에게서 주로 나타났다. 이에 대한 교육학적 함의를 논의하였다. In this study, we investigated the interlanguage of ninth graders that was used to classify and explain the phenomena related to the change of the matters in a group discussion and semi-structured interview. The patterns of the interlanguage were classified and analyzed through the change of their understanding of science languages. The analyses of the results suggested that the interlanguage of the students are classified into the three patterns according to its meaning and form. Pattern 1 is science language used in combination with everyday language to express scientific meaning. This was used by most students regardless of the level of understanding of science languages. Pattern 2 is everyday language used to show scientific meaning, which was used by students who had better understanding of science languages than the others. Pattern 3 is using languages with multiple meaning, which was mainly used by students who have superficial understanding of science languages. Educational implications of these findings are discussed.
Implementation of 100CMM Thermal Storage Combustion Oxidizer for VOCs Reduction
Dal-Hwan Yoon,Dal-Hwan Yoon,Beom-Soon Han,Tae-Yeung Lim,Eun-Chan Yang,Yeong-Woong Keon,Hyeon-Woo An,Chan-Ho Kim,Sung-Chan Kang,Min-Ki Jung,Jong-Geun Kim,Hwi-Chan Oh,Chan-Hyouk Jeon,Min-Su Jeon,A-Yeon 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
The heat storage type combustion oxidation device is a system capable of treating VOCs (Volatile Organic Compounds) discharged to the atmosphere at 95% or more. Aromatic hydrocarbons such as benzene are strong carcinogenic substances that cause leukemia, central nervous disorder, and chromosomal abnormalities, and hydrochloride causes destruction of the ozone layer and global warming. This VOCs reduction technology is expected to reduce the number of harmful substances generated for many operating and working conditions. This paper implements a 100CMM Regenerative Thermal Oxidation (RTO) device to reduce air pollution in VOCs generating sites. The carbon-free system is evaluated by measuring the concentration of the VOCs emission gas according to the operating conditions of the production process, analyzing and measuring the THC (Total Hydro-carbons) concentration change. As a result, through the 100CMM RTO experiment, stable RTO driving, renewable energy measurement, and hydrocarbons and nitrogen oxides can be reduced.
The Demage of Bacterial Diseases of Soybean in Korea
Yeong-Hoon Lee,Nam-Goo Kim,In-Youl Baek,Jong-Min Ko,Chan-Sik Jung,Hyun-Tea Kim,Sang-Ouk Shin,Ha-Sik Shim,Byong-Won Lee,Myeong-Gi Jeon,Ki-Woung Yang,Young-Nam Yoon,Keum-Yong Park 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04
It has been reported that bacterial diseases of domestic soybean are bacterial pustule, wildfire, bacterial blight and bacterial brown spot. Among these bacterial diseases, bacterial blight infected by Gram-negative Xanthomonas campestris pv. glycines had been the most issue in soybean diseases. In recently, issue in soybean disease was shifted to wildfire by Gram-negative Pseudomonas syringae pv. tabaci. When infected in nature, symptom of wildfire generally surrounded infected-area of bacterial blight and formed pustule in infective center. Because optimum growth temperature of Wildfire is lower than these of bacterial pustule, Wildfire caused damage to crop yield in later growth stage. In this study, we checked symptoms of bacterial diseases with growth stages of soybean. Also, we surveyed disease severity of single infection, simultaneous infection and sequential infection of bacterial pustule and wildfire.
Selective extraction of glutaric acid from biological production systems using n-butanol
Yeong-Hoon Han,Ye-Lim Park,Soo-Yeon Yang,Hye-Rim Jung,Jeong Chan Joo,Bong-Keun Song,Sang Hyun Lee,Kyungmoon Park,Jung-Oh Ahn,Yung Hun Yang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Glutaric acid has numerous industrial applications and it could be used as a polymer building block. Glutaric acid can be produced by chemical or biological methods. Although the biological production ofglutaric acid has attracted considerable attention, there are few effective and economical processes forrecovering glutaric acid from water based systems. Herein, we investigated the selective extraction ofglutaric acid via physical extraction using nine different solvents compared with trioctylamine/toluene asthe reactive extraction, which is the only reported method for recovering glutaric acid from biologicalproduction systems. Comparisons of the extraction yield, purity, linear solvation energy relationshipbetween the solvents, and reactant selectivity revealed n-butanol to be a suitable solvent for theextraction of glutaric acid, with a high extraction yield and selectivity obtained in less than 30 min underoptimized conditions. Furthermore, repetitive extraction allowed 98.4% of glutaric acid to be extractedfrom the aqueous phase with high solvent recovery and high purity, making this method suitable forpractical application.
Identification of Differentially Expressed Proteins in Human Kidney with IgA Nephropathy
( Yeong Jin Choi ),( Eun Hui Wang ),( Kweon Heang Lee ),( Yong Bok Koh ),( Dong Chan Jin ),( Chul Woo Yang ),( Yong Soo Kim ),( Byung Kee Bang ),( Chang Suk Kang ),( Jung Ho Cha ) 대한신장학회 2003 춘계학술대회 초록집 Vol.22 No.1