정식 시기와 적심 횟수가 화단국화의 생장과 개화에 미치는 영향

姚婧超, 정해준, 김동찬, 이진희, 권민훈, 서병기 배재대학교 자연과학연구소 2013 自然科學論文集 Vol.24 No.1

This study was conducted to investigate optimum planting date and pinching times on the growth and flowering of garden chrysanthemum(Dendranthema grandiflorum Ramat.). 3 lines of garden mums were planted on May 16, June 13 and July 11 respectively. As planting date was delayed, all the 3 lines' plant height and plant width was reduced. 09-19-49 line got the biggest plant height and width, followed by 09-11-37 line. And 08-166-02 line was the smallest. In different planting times, the experiment group of May 16 and June 13 got the biggest plant height, plant width and stem diameter. However, in the experiment group of May 16, most of the plants got flattened. The experiment group of June 13 got the best ornamental value, and the ornamental value was reduced in the experiment group of July 11 by the short vegetative growth. 09-19-49 line got the most flowers, while in different planting time, the experiment group of May 16 got the most flowers. 09-11-37 line got the biggest flower diameter. 09-11-37 line and 09-09-51 line were planted in the containers on the rooftop. Each groups were pinched by 1, 2 and 3 times on July 2, July 26 and Aug 16 respectively. There was no effect on plant height, plant width, and stem diameter of 09-09-51 line and 09-11-37 line between 1-time-pinching group and 2-time-pinching group. But 3-time-pinching group was reduced. There was no significance in flower diameter of these two lines but the number of flowers was reduced by more pinching times. Therefore, in this experiment, the groups which were planted on June 13 got the best ornamental value and the recommended planting time is in the middle of June. Furthermore, 2 times of pinching was recommended.

중금속 이온과 질소-황을 포함하는 포단드와의 착물형성에 관한 연구

정징운,이선하,최규성,강동현 慶南大學校 附設 基礎科學硏究所 1997 硏究論文集 Vol.10 No.-

The stability constant, enthalpy, and etropy changes of complexation of heavy metal ions (Zn²*, Cd²*) with podands containing nitrogen-sulfur donors such as tri(phenylthio-2-ethyl)amine (Podand Ⅰ), tri(benzylmercapto-2-ethyl)amine(Podand Ⅱ), and tetra(phenylthio-2-ethyl)ethylenediamine (Podand Ⅲ) have been determined by using potentiometric titration in 95% MeOH at various temperature. We observed the Podand Ⅲ ligand showed the largest protonation constant. The values of protonation constant and stability constant for Zn(Ⅱ), and Cd(Ⅱ) ions among three different ligands were increased as following order, Podand Ⅰ< Podand Ⅱ< Podand Ⅲ. In addition, thermodynamic parameters ΔH and TΔS of Zn(Ⅱ), Cd(Ⅱ) complexes have studied.

한국인에서 Ataxia Telangiectasia 유전자의 다형성에 대한 연구

김영통,정동준,이정은,이용진,김창진 순천향대학교 교수학습개발센터 2004 Journal of Soonchunhyang Medical Science Vol.10 No.3

Ataxia-telangiectasis(AT) is an autosomal recessive disorder characterized by berebellar ataxia, oulocutaneous telangiectaisa, immune defects, and a predisposition to malignancy. The gene for AT, deginated ATM(ataxia telangiectasia mutated), located on chromosome 11q22-q23, contains 66 exons spanning approximately 150 kb of genomic DNA and encodes a protein of 3056 amino acids. It is sell established that patiens with At have a strong predispositon to malignancy, particularly leukemias and lymphomas. An increase predisposition to malignancy has also been suggested to involve heterozygotes for ATM gene mutations. The genetic bases of carcinogenesis for various cancers in Korea have not been studies in detail and the study on the heterozygosity of AT in Korean population would be necessory. In this study, 150 healthy Koreans were studies for the polymorphism at AT using PCR of exon 39 of AT gene. The result was that 110 persons (73%) were heterozygote for wild and polymorphic type(A1/A2), and 40(27%) revealed homozygous polymorphic type A2/A2. The wild type homozygous tyep A1/A1 was not noted in Korean. Above results suggests that heterozygosity of AT is not infrequent in Koreans, and further studies on the carcinogenetic effects of AT in various cancers in Korea would be necessory.

조경용 국화 품종 ‘Pansy Ball’과 육성 계통의 적정 식재 밀도

정해준 · 김동찬 · 姚婧超 · 서병기 배재대학교 자연과학연구소 2012 自然科學論文集 Vol.23 No.1

This research was carried out to investigate optimum planting density of landscape garden mum ‘Pansy Ball’ and 5 inbred lines. ‘Pansy Ball’ and 5 inbred lines of garden mums were planted at Pai Chai university campus on April 25, 2011. Plant density was controlled by 1 plant, 2 plants, 4 plants in one plot of 0.4m x 0.5m respectively. Average plant height in 1 plant in one plot was 46.2cm~71.7cm. And the average plant height in 2 plant in one plot was 45.9cm~64.8cm, while 4 plant in one plot was 38.9cm~53.2cm. Also, plant width of 05-18-01, 05-01-01, 09-76-03, and 09-02-02 inbred lines were over 50cm by 1 plant in one plot. However, as the plant height and plant density was high, most of the plants got flattened and the ornamental value was also reduced. We got the ‘Pansy Ball’ and 2 inbred lines 09-76-03, 09-02-02 for proper landscape ground cover plant.

한국인 직무 스트레스 측정도구의 개발 및 표준화

장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.

Video Seamless Splicing Method Based on SURF Algorithm and Harris Corner Points Detection

Dong Jing,Chen Dong,Jiang Shuwen 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.4

Asiatic Acid Protects Dopaminergic Neurons from Neuroinflammation by Suppressing Mitochondrial ROS Production

( Dong Chen ),( Xiao-ya Zhang ),( Jing Sun ),( Qi-jie Cong ),( Wei-xiong Chen ),( Hafiz Muhammad Ahsan ),( Jing Gao ),( Jin-jun Qian ) 한국응용약물학회 2019 Biomolecules & Therapeutics(구 응용약물학회지) Vol.27 No.5

This study sought to evaluate the effects of Asiatic acid in LPS-induced BV2 microglia cells and 1-methyl-4-phenyl-pyridine (MPP+)-induced SH-SY5Y cells, to investigate the potential anti-inflammatory mechanisms of Asiatic acid in Parkinson’s disease (PD). SH-SY5Y cells were induced using MPP+ to establish as an in vitro model of PD, so that the effects of Asiatic acid on dopaminergic neurons could be examined. The NLRP3 inflammasome was activated in BV2 microglia cells to explore potential mechanisms for the neuroprotective effects of Asiatic acid. We showed that Asiatic acid reduced intracellular production of mitochondrial reactive oxygen species and altered the mitochondrial membrane potential to regulate mitochondrial dysfunction, and suppressed the NLRP3 inflammasome in microglia cells. We additionally found that treatment with Asiatic acid directly improved SH-SY5Y cell viability and mitochondrial dysfunction induced by MPP+. These data demonstrate that Asiatic acid both inhibits the activation of the NLRP3 inflammasome by downregulating mitochondrial reactive oxygen species directly to protect dopaminergic neurons from, and improves mitochondrial dysfunction in SH-SY5Y cells, which were established as a model of Parkinson’s disease. Our finding reveals that Asiatic acid protects dopaminergic neurons from neuroinflammation by suppressing NLRP3 inflammasome activation in microglia cells as well as protecting dopaminergic neurons directly. This suggests a promising clinical use of Asiatic acid for PD therapy.

Influence of Kluyveromyces marxianus on proteins, peptides, and amino acids in Lactobacillus-fermented milk

Dong-Dong Zhang,Jing-Lan Liu,Tie-Min Jiang,Lu Li,Guo-Zhen Fang,Yan-Pin Liu,Li-Jun Chen 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.3

With increasing application of yeast in fermented milk, in order to study the effect of yeast on milk protein during the fermentation process, the effects of the presence of Kluyveromyces marxianus in milk fermented by Streptococcus thermophilus and Lactobacillus bulgaricus were investigated. After fermentation, the amino acid, protein, and peptide contents were analyzed by ultra-performance liquid chromatography, two-dimensional gel electrophoresis, and liquid chromatography–mass spectrometry, respectively. After the addition of K. marxianus for fermentation, 25 protein spots changed significantly. These were mostly caseins and bovine serum proteins, and the content of total free amino acids increased by 16.30%; ten types of bioactive peptides were identified. Furthermore, the number of peptide types in milk fermented by K. marxianus increased significantly compared with milk fermented by Lactobacillus. K. marxianus is considered to promote proteometabolism in milk when added with Lactobacillus, generate flavor compounds, and improve the digestion and absorption character of milk.

Finite element analysis and axial bearing capacity of steel reinforced recycled concrete filled square steel tube columns

Jing Dong,Hui Ma,Changming Zou,Yunhe Liu,Chen Huang 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.72 No.1

This paper presents a finite element model which can simulate the axial compression behavior of steel reinforced recycled concrete (SRRC) filled square steel tube columns using the ABAQUS software. The analytical model was established by selecting the reasonable nonlinear analysis theory and the constitutive relationship of material in the columns. The nonlinear analysis of failure modes, deformation characteristics, stress nephogram, and load-strain curves of columns under axial loads was performed in detail. Meanwhile, the influences of recycled coarse aggregate (RCA) replacement percentage, profile steel ratio, width thickness ratio of square steel tube, RAC strength and slenderness ratio on the axial compression behavior of columns were also analyzed carefully. It shows that the results of finite element analysis are in good agreement with the experimental results, which verifies the validity of the analytical model. The axial bearing capacity of columns decreased with the increase of RCA replacement percentage. While the increase of wall thickness of square steel tube, profile steel ratio and RAC strength were all beneficial to improve the bearing capacity of columns. Additionally, the parameter analysis of finite element analysis on the columns was also carried out by using the above numerical model. In general, the SRRC filled square steel tube columns have high bearing capacity and good deformation ability. On the basis of the above analysis, a modified formula based on the American ANSI/AISC 360-10 was proposed to calculate the nominal axial bearing capacity of the columns under axial loads. The research conclusions can provide some references for the engineering application of this kind of columns.

Sizing Up Chinese Military Buildup: The Limitations to Defense Modernization

( Jing Dong Yuan ),( Yu Chao Zhu ) 한국국방연구원 1996 The Korean Journal of Defense Analysis Vol.8 No.1

This article documents and analyzes China`s recent defense modernization programs, in particular its arms acquisitions from the United States and Russia since the early 1980s. It examines how China`s changing security perspectives and the concomitant shifts in strategic doctrines have informed and conditioned the country`s defense modernization priorities and programs. On the one hand, the doctrinal shift from an emphasis on "people`s war" to one on "local war under hi-tech conditions" has highlighted the needs to modernize equipment in several key mission areas, which remains deficient. On the other hand, China`s domestic defense industry appears unable to provide the kind of sophisticated weaponry that modern warfare requires. To close this mission-capability gap requires imports of both advanced defense equipment and military technology. Significant weapons acquisitions are antithesis to the long-held principle of self-reliance and may create a politically unacceptable dependence relationship with foreign suppliers; nor is such a quick-fix tactic financially feasible or realistic. Consequently, while selective purchases of equipment in high-priority and "bottleneck" areas remain an important policy option, a long-term strategy has been to enhance the overall technological level of the domestic defense industrial base, with an emphasis on the importation of technology, licensed production, coproduction, and co development of weapons. China`s arms acquisitions from the United States and the Soviet Union or Russia during 1980-95 have shown that major purchases have been limited and selective, and mainly in the areas where the PLA needed immediate equipment improvement, or in the areas where imports could result in military technology transfers. China`s experience with buying US defense equipment, where actual purchases consistently fell far below what was allowed, is a clear indication of Chinese approaches. At the same time, the recent "buying spree" of Russian weaponry notwithstanding, such significant purchases were largely motivated by opportunities (e.g., attractive price and payment arrangements). Even here, Chinese defense planners have sought to obtain Soviet/Russian military technology, license-production rights, and/or coproduction arrangements. And the recent Sino-Russian agreement on completing the long-stalled sale of Su-27s may clear the way for the transfer of Su-27 production technology to Chinese aerospace industries, with significant long-term implications for China`s defense modernization and regional military balance. However, in overall terms, China`s current abilities to obtain advanced defense equipment from abroad will remain limited due both to domestic resource limitations and to Western (and even Russian) export control policies. Clearly, there are limitations to the pace and scope of Chinese military buildup, which recent analyses tend to overestimate. A more balanced analysis needs to take into consideration opportunities as well as constraints that may affect the progress of Chinese defense modernization.