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염해 및 한발에 대한 보리의 생화학적 반응 - 항산화효소 활성 및 아미노산 함량의 변화
김대욱,허화영,서세정,이영호,김시주,Kim, Dea-Wook,Heo, Hwa-Young,Suh, Sae-Jung,Lee, Yeong-Ho,Kim, Si-Ju 한국작물학회 2006 Korean journal of crop science Vol.51 No.suppl1
To differentiate barley responses to drought and salt stress, barley seedlings at the second leaf stage were treated with 218 mM NaCl and 29.5% PEG6000 iso-osmotic to 218 mM NaCl for 6 days. Shoot fresh weight and leaf relative water content of barley seedlings were more reduced by drought compared to salt stress. Hydrogen peroxide content increased under both stress conditions, but its accumulation was more severe at 6 days after salt stress. The activity of ascorbate peroxidase, glutathione reductase (GR) and catalase (CAT) was enhanced until 4 days after salt stress. On the other hand, the activity of GR and CAT increased gradually until 6 days after drought. Among the amino acids measured in this study, the accumulation of glycine, arginine and GABA (${\gamma}-aminobutyric$ acid) was lower under salt stress than drought. However, considerably larger amount of proline was accumulated by salt stress. It is concluded that the antioxidant enzymes activity and amino acid content of barley seed-lings were differently regulated in response to the isoosmotic condition of salt and drought stress. 본 연구는 삼투포텐셜이 동일한 NaCl과 PEG6000 용액을 사용하여 염해와 한발에 대한 보리의 생화학적 반응을 검토하였으며 시험결과를 요약하면 다음과 같다. 1. 보리의 지상부 생육 및 보리 잎의 상대수분함량은 염해보다 한발에 의해서 더욱 감소하였다. 2. 과산화수소의 발생은 염해처리 후 6일에 한발보다 27.5% 많았으며, 영해처리 후 4일에 나타난 APX, CAT 및 GR의 활성은 한발처 리보다 각각 12.6%, 27.9%, 23.3% 높았다. 한편, 보리의 경우 CAT의 활성은 한발보다 염해조건에서 더욱 신속하게 유도되는 것으로 나타났다. 3. 아미노산 함량의 변화는 염해 및 한발처리에 의해서 서로 다른 양상을 보였다. 특히 glycine, arginine 및 GABA의 함량은 한발처리에서 더욱 증가하였으나, proline의 함량은 염해처리에서 크게 증가하였다. 4. 본 연구를 통해서 보리의 항산화효소 활성 및 아미노산 함량이 염해와 한발에 의해서 상이하게 조절되는 것이 확인되었다. 이러한 결과들은 염해에 대한 보리의 특이적인 반응지표가 될 수 있을 것으로 생각되었다.
주거지역 종세분화에 따른 주거환경 개선에 관한 연구 - 바람길을 중심으로 -
김대욱,정응호,류지원,차재규,이준영,Kim, Dae-Wuk,Jung, Eung-Ho,Ryu, Ji-Won,Cha, Jae-Gyu,Lee, Jun-Young 한국주거학회 2010 한국주거학회 논문집 Vol.21 No.2
Various environmental problems due to rapid industrialization and urbanization have worsened to such an extent that they threaten the environmental restitution of the globe and become a critical international issue. Korean government has presented the concept of green growth as a new state vision for the next 60 years and is making efforts to solve these environmental problems. Daegu Metropolitan City has faced various environmental problems including overpopulation of the city, traffic pollution, household waste accumulation and the green zone problem because of the increase of urbanization over the last few decades. As such urbanization continues, the quality of residential environments is rapidly deteriorating and the intensive use of the land leads to an increase of building area, raising the temperatures of cities. There have therefore been demands for healthy, pleasant and satisfying residential environments and for the improvement of existing residential environments, and this demand has been fully recognized by society. Nevertheless, current residential complex developments concentrate only on raising the efficiency of land use. In related laws of the past (Daegu Metropolitan City, Urban Planning Municipal Ordinance as of October 10, 2003) an attempt was made to impose a standard to segmentalize the building-to-land ratio, floor area ratio and regulations of number of floors vertically. However, these laws have now been abolished and the regulations are being eased. The purpose of this study was to analyze the characteristics of the floating wind before and after the vertical segmentation of residential areas (Daegu Metropolitan City, Urban Planning Municipal Ordinance as of October 10, 2003) by using KLAM_21, a model that enables analysis and prediction of the flow and generation of cold wind. The purpose is also to present a plan to improve the quality of residential areas when developing a building lot and redeveloping housing areas.
김대욱,김성곤,김지훈,양영희,정우영,이진성,Kim, Dae-Wook,Kim, Sung-Gon,Kim, Ji-Hoon,Yang, Young-Hui,Jung, Woo-Young,Lee, Jin-Seong 대한수면의학회 2013 수면·정신생리 Vol.20 No.2
목 적 : 의학전문대학원 학생들은 과도한 학업으로 인해 수면 시간이 부족하고 수면의 질이 낮다고 알려져 있다. 본 연구는 의학전문대학원 학생의 수면 양상 및 이와 연관이 있을 것으로 생각되는 심리적 문제를 조사하였다. 방 법 : 부산대학교 의학전문대학원 1~4학년 학생 352명을 대상으로 수면 양상, Pittsburgh sleep quality index(PSQI), Epworth sleepiness scale(ESS), global assessment of recent stress scale(GASS), the center for epidemiologic studies-depression scale(CES-D), and Moudsley obsessive-compulsive inventory(MOCI)를 조사하였다. 두 군간 연속변수 비교에는 독립 t-검정, 비연속비교는 ${\chi}^2$-검정, 두 변수간의 상관관계는 Pearson 상관분석, 그리고 세 군 이상 비교에는 ANOVA를 이용하였다(p<0.05, 양측검정). 결 과 : 평일 수면시간 5시간 36분, 주말 수면시간 7시간 39분으로, 주말 수면시간이 더 길었다(t=15.94, p<0.001). 취침 시각은 평일 0 : 49, 주말 1 : 34으로 주말에 더 늦게 취침하였고(t=-5.23, p<0.001), 기상 시각은 평일 6 : 58,. 주말 9 : 30으로 주말에 더 늦게 기상하였다(t=-24.48, p<0.001). PSQI는 ESS(r=0.383, p<0.001), GASS(r=0.326, p<0.001), CES-D(r=0.393, p<0.001), 그리고 MOCI 점수(r=0.247, p< 0.001)와 양의 상관관계를 보였지만, 성적과는 상관관계를 보이지 않았다(r=0.072, p=0.228). 학년이 높을수록 PSQI, GASS, CES-D, MOCI 점수가 낮았다(p<0.05). 결 론 : 의학전문대학원생들의 수면의 질은 낮았고 수면 시간은 부족하였다. 수면의 질은 주간졸림, 우울감, 스트레스, 강박 성향과 연관성이 있었다. Introduction: Although it is well known that medical students are not getting an adequate amount of sleep, there have been only a few studies on the sleep patterns of medical students and the related factors. Therefore, the present study aimed to investigate the medical students' sleep patterns and the related factors. Methods: A questionnaire package was administered to the $1^{st}$ to $4^{th}$ year medical students at one medical school. It consisted of questions asking about their lifestyles as well as Pittsburgh sleep quality index (PSQI), Epworth sleepiness scale (ESS), global assessment of recent stress scale (GASS), the center for epidemiologic studies-depression scale (CES-D), and Moudsley obsessive-compulsive inventory (MOCI). A total of 352 students (206 males and 146 females) responded to the survey and the result was analyzed using the independent t-test, the chi-square test, the paired t-test, Pearson's correlation and ANOVA. p-values of less than 0.05 were considered statistically significant in analyses. Results: The weekend bedtime was significantly delayed (0 : 49 on weekday ; 1 : 34 on weekend ; t=-5.23, p<0.001), the weekend rise time was delayed (6 : 58 on weekday ; 9 : 30 on weekend ; t=-24.48, p<0.001) and the total sleep time was increased on weekends (5 : 36 on weekday ; 7 : 39 on weekend ; t=15.94, p<0.001). The PSQI score of all subjects was 6.43{\pm}2.64. PSQI was positively correlated with ESS (r=0.383, p<0.001), GASS (r=0.326, p<0.001), CES-D (r=0.393, p< 0.001), and MOCI (r=0.247, p<0.001), but not with GPA (r=0.072, p=0.228. The more senior students had lower PSQI, GASS, CES-D, and MOCI score (p<0.05). Conclusion: Medical students were experiencing a lack of sleep during weekdays as they have a later bedtime and earlier rise time, and consequently had more hours of sleep on weekends. Overall, the medical students were experiencing poor sleep quality and sleep deprivation. Poor sleep quality is associated with psychological problems (daytime sleepiness, stress, depression, and obsessive tendency).
Quaternary Coded Structured Light 와 위상을 이용한 고정밀 Point Cloud 생성 알고리즘
김대욱(Dae-Wook Kim),이주성(Joosung Lee),백승엽(Stephen Baek),이건우(Kunwoo Lee) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.8
3D Scanner is growing industry due to remarkable interests in 3D printing nowadays. To make point cloud, 3D scanner can use many variety ways but generally uses structured light which is uniquely coded binary pattern and reconstructs 3D point cloud through stereo images. We first calibrate the camera, get rectified image, and apply boundary offset at the pre-processing. Using quaternary code on pixels, correspondence can be found roughly. For the purpose of obtaining high-precision point cloud, roughly matched correspondences are corrected with sub-pixel edge detection and phase interpolation. At the post-processing, remove the background and mismatched pixels. Result demonstrates the system has measurement area of 12 × 9㎝², with resolution about 0.06mm.