We evaluated the effect of mixed liquid fertilizer (MLF) on growth responses of plants and soil chemical properties. To do so, a pot experiment with cherry tomatoes (Lycopersicon esculentum var. cerasiforme) using loam soil was conducted for 81 days in a temperature-controlled glasshouse, and four N fertilization treatments were laid out in a completely randomized design with three replicates: control (C), chemical fertilizer treatment (CF), and two rates (MLF-0.5 and MLF-1.0) of MLF treatment. Soils were periodically sampled and analyzed for pH, EC, total N, inorganic N and total C, and growth characteristics of cherry tomatoes were measured. During the experimental periods, the pH of MLF soils was higher than that of CF soils. Soil total-N content increased right after CF-application and ultimately decreased to the level of the control (C) soil, while MLF-application slightly increased the level of soil total-N and this level remained unchanged throughout the experiment. The levels of soil inorganic N content increased after application of CF or MLF, but the initial increase disappeared in 56 days after transplanting (DAT). The dry weight of shoots and roots increased in CF or MLF plants, while the number of fruit increased only in MLF plants. Whereas soluble solid contents were higher in MLF plants than in the other (C and CF) plants, the titratable acidity was not different among treatments. However, no consistent effect of N treatments on major elements of the organs of cherry tomatoes was found. The amounts of N taken up by plants were 0.91 g for CF, 0.61 g for MLF-1.0, 0.43 g for MLF-0.5, and 0.25 g for control treatments, resulting in greater N efficiency for CF than for MLF.
It is common sense that providing specific odor can increase the video reality when video scene has an object having specific odor. However, people still do not know how to increase video reality and emotional immersion when there is no information on specific odor in the scene. So, present study explores how we improve video reality and immersion when the scene has no concrete odor information from some objects. Especially, this research focuses on diverse previous studies about matching between odor and color and then we expect providing odor can increase video reality if the odor is well-matched with the video's color. To do this, we collected 48 odors and investigated which color was well-matched with each odor. As a result, we get 5 odors which had clearly well-matched colors and decide ill-matched colors of those 5 odors as complementary colors of well-matched colors (Experiment 1). After that, we organize 3 conditions such as coloring image and video clip with well-matched color (color-odor match condition), coloring those with ill-matched color (color-odor mismatch condition), and coloring those with achromatic color by removing color saturation (color-odor neutral condition). Under each of these three conditions, image-odor matching, increment of reality with the odor, increment of immersion with the odor, and odor preference are asked (Experiment 2; 3). The results showed that the scores of all 4 questions in color-odor match condition were higher than color-odor mismatch condition and neutral condition. These results mean that providing matching odor with the scene's color in video is very effective to increase video reality and immersion. We expect experiencing better reality and immersion with olfactory information by adding various future research.
This paper is the forth and fifth one of the study on balanced type oscillating mole drainer. In the light of the results from previous reports about the model tests, some design criteria were established and a prototype machine was set up for experimental purpose. Motion characteristics and functionof the each parts of the machine were checked and analyzed. After that, performance tests of the prototype machine were carried out in thefield. Obtained results are summarized as follows ; 1. Ten centimeter of the bullet diameter was determined so as to be able to attach it to the tractors with capacity of 30 PS to 40 PS. 2. To maintain the balance between the moments of the front shank and rear shank, the oscillating amplitude of the rear bullet was determined to be larger than that of the front bullet. At the same time , the oscillating direction of the rear bullet was designed with the inclines of ten to thirty degrees. 3. An octagonal dynamo transduced was developed for measuring the compressive force of the upper link is measuring the draft force of the machine. Acceptable linear relationship between forces and strain responses from O.D.T. was obtained. 4. Analysing the balancing mechanism of the acting part of the machine , it was found that the total draft force of the machine was equal to the difference between the sum of the draft force produced from the right and left side bending moments of the lower drawber and the compressive force on the upper link. 5. There are acceptable linear relationship between the strain and twisting moment by driving shaft, and between strain and shank moment. Above results enable us to carry out the field experiment with prototype machine. 6. When the test machine was used in the field, it was possible to reduce the oscillating acceleration by forty percent in average as compared it with the single bullet mole drainer. 7. When the test machine was used under the oscillating condition, the dratt torce was reduced by 27 percent to 59 percent as compared it with the test machine under non-oscillating condition, while the draft force was increased by 7 percent to 20 percent as compared it with the mole drainer having oscillating single bullet. The reasoning behind this fact was considered as the resistance force due to the rear shank and bullet. 8. As the amplitude and frequency of the bullet were increased, the torque was increased accordingly. This tendency could be varied with the various characteristics of the given soils. And the larger frequency and amplitute, the more increasing oscil\ulcornerlating power but decreasing draft brce were needed, and draft force was increased as the velocity was increased.9. When the amplitude of the rear bullet was designed to be larger than that of the front bullet, the minimum value of the moment was lowered and oscillating acceleration was reduced. And when the oscillating direction of the rear bullet was declined back\ulcornerwards, oscillating acceleration was increased along with the increasing angle of decli\ulcornernation. When the test machine was operated in high speed, the difference between maximum moments and minimum ones became narrow. This varying magnitude of moments appeared on the moment oscillogram seems to be correlated to the oscillating acceleration and draft force. 10. From the analysis of variance, it was found that those factors such as frequency, amplitude, and operating velocity significantly affected in the oscillating acceleration, the draft resistance, the torque, the moment, and the total power required. And interaction between frequency and amplitude affected in the oscillating acceleration. 11. Within the given situation of this study, the most preferable operating conditions of the test machine were 7 Hz in oscillating frequency, 0.54 m/sec in operating velocity, and 39.1 mm in oscillating amplitude of front and rear bullets. However, it is necessary to select the proper frequency and magnitude of oscillation depending on the soil properties of the field in which the mole drainer is practiced by use of a bal1nced type oscillating mole drainer. 12. It is recommended that a comparative study of the mole drainers would be performed in the near future using two separate balanced oscillating bullet with the one which is operated by oscillating the movable bullet in a single cylinder or other balanced type which may be single oscillating bullet with spring, damper or balancing weight, and that of thing. To expand the applicability of the balanced type oscillating mole drainer in practical use, it is suggested to develop a new mechanism which perform mole drain with vinyl pipe or filling material such as rice hull.
Purpose Because of many advantages, PET-CT Scanners generally use CT Data for attenuation correction. By using CT based attenuation correction, we can get anatomical information, reduce scan time and make more accurate correction of attenuation. However in case metal artifact occurred during CT scan, CT-based attenuation correction can induce artifacts and quantitative errors that can affect the PET images. Therefore this study infers true SUV of metal artifact region from attenuation corrected image count -to- non attenuation corrected image count ratio. Materials and Methods Micro phantom inserted $^{18}F-FDG$ 4mCi was used for phantom test and Biograph mCT S(40) is used for medical test equipment. We generated metal artifact in micro phantom by using metal. Then we acquired both metal artifact region of correction factor and non metal artifact region of correction factor by using attenuation correction image count -to- non attenuation correction image count ratio. In case of clinical image, we reconstructed both attenuation corrected images and non attenuation corrected images of 10 normal patient($66{\pm}15age$) who examined PET-CT scan in SNUH. After that, we standardize several organs of correction factor by using attenuation corrected image count -to- non attenuation corrected count ratio. Then we figured out metal artifact region of correction factor by using metal artifact region of attenuation corrected image count -to- non attenuation corrected count ratio And we compared standard organs correction factor with metal artifact region correction factor. Results according to phantom test results, metal artifact induce overestimation of correction factor so metal artifact region of correction factors are 12% bigger than the non metal artifact region of correction factors. in case of clinical test, correction factor of organs with high CT number(>1000) is $8{\pm}0.5%$, correction factor of organs with CT number similar to soft tissue is $6{\pm}2%$ and correction factor of organs with low CT number(-100>) is $3{\pm}1%$. Also metal artifact correction factors are 20% bigger than soft tissue correction factors which didn't happened metal artifact. Conclusion metal artifact lead to overestimation of attenuation coefficient. because of that, SUV of metal artifact region is overestimated. Thus for more accurate quantitative evaluation, using attenuation correction image count -to-non attenuation correction image count ratio is one of the methods to reduce metal artifact affect.
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
/
v.16
no.2
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pp.70-80
/
2011
Estuarine ecosystem responds sensitively to natural and anthropogenic perturbations. lt is necessary to identify the direction of the change when the perturbation occurs as well as to understand the structure and functioning of estuarine ecosystem for a proper management of the area. In this study, the estuarine habitats were classified into different ecological districts so as to the switch from one district to another district could be related to the environmental change due to the perturbations. Total 16 ecological districts was defined according to the presence of barrage, salinity and vegetation characteristics. The defined ecological districts were applied to small estuaries in Goseong bay, south sea of Korea (Baedun, Guman, Maam, Goseong) to distinguish different regions which might have characteristic bottom topography, inclinations of river bottom, sediment characteristics, salinity structure and area of vegetation. Total 7 out of 16 ecological district was identified in this region; NFB (natural, fresh, bare), NHB (natural, high salinity, bare), NLV (natural, low salinity, vegetated) in natural (without barrage) estuaries and CFB (closed, fresh, bare), CFV( closed, fresh vegetated), CLV (closed, low salinity, vegetated), CHB (closed, high salinity, bare) in closed (with barrage) estuary. A comparison of environmental factors and biota between CHB and CLV demonstrated the effect of barrage on estuarine ecosystem. The height and sediment characteristics of CHB and CLV were similar but the average salinity was lower in CLV than in CHB due to the barrage, which produced favorable condition for the Phragmites australis in CLV. Information regarding the ecological districts in various sizes and location could be useful for predicting the ecosystem change due to natural and anthropogenic perturbations and for preparing management actions.
Journal of Korean Society of Occupational and Environmental Hygiene
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v.8
no.2
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pp.242-253
/
1998
South Korea has been producing asbestos over 60 years. The use of asbestos was over 50 years for production of asbestos slate and 27 years for asbestos friction materials including asbestos textile and brake-lining. Thus, it can be supposed that asbestos related diseases such as asbestosis, lung cancer and mesothelioma could be found in the vulnerable workers exposed to asbestos in 1955-1975, given the average latency period of 10-30 years. Asbestos was produced primarily by Japanese during World War II In Korea. The production of chrysotile peaked to 4,815 tons in 1944. From 1978 to 1984, 10,000 tons of asbestos were produced annually. However, the production was interrupted by raising labor costs and extinction of mine reserves, and finally they had to depend on import for the need of asbestos. In 1945, there were 16 asbestos mines, in total, with the addition of new asbestos mines in South Korea. Imports of asbestos was increased from 74,000 tons to 95,000 tons during the period of 1976 - 1992. But the imports was reduced to 88,000 tons in 1995. Since, in addition to the import of asbestos itself, the imports of asbestos products were increased as well and the accumulation of asbestos reached to 30,000 tons during the period of 1964 to 1993. In 1965, there was only one asbestos company with 207 employees. But the size of asbestos industry has been expanded so much that 118 asbestos companies could be found in 1993 with 1,476 workers. However, there was no record on the survey of asbestos concentration to which workers were exposed in any companies in 1983. The record of the air-borne concentration of the asbestos in textile working places in 1984 showed 6.7 fibers/cc by geometric mean(GM), but it was reduced to 1.2 fibers/cc in 1993. GMs of asbestos in working places for construction materials and asbestos textiles were also decreased from 1.7 fibers/cc to 0.55 fibers/cc during the period of 1984 - 1996.
The proportion of imported wood has been now over 80% of raw materials needed in the wood industry, and therefore, many of studies on the substitution of domestic wood for imported wood and on the increasing the utilization rate of domestic species have been attempted and considered as very important projects to solve. But these trials were practically restricted by several disadvantages of domestic species. such as a small diameter, variety of species, and irregularity of wood physical or chemical characteristics, etc. From a this point of view, this study was carried out to investigate solid wood bending properties of sample trees and then to develop their end uses. The species of sample trees were Pinus densiflora S. et Z., Pinus rigida Mill., and Larix leptolepis Gord. which have large growing stocks but Pinus rigida and Larix leptolepis have not been used well because of their poor qualities. The results obtained were as follows: 1. The optimum conditions for solid wood bending processing of Pinus densiflora, Pinus rigida, and Larix leptolepis are showed in Table 6. 2. The minimum solid-bending radii of Pinus densifjora, Pinus rigida, and Larix ieptolepls were 260mm, 240mm, and 300mm, respectively in steaming treatment.
xylA promoter is a major promoter in xylose operon of Escherichia coli. xylA promoter is sufficient as the promoter for the construction of new expression vector because this promoter was tightly controlled and induced by the addition of xylose. For the construction of xylose-inducible expression vector, 600 bp of xylA promoter was ligated between AatII and HindIII of pUC18, named pXA600. In order to investigate the effect of XylR protein encoded by xylR gene on the xylA promoter, 1,988 bp of xylR gene including its promoter was ligated into downstream of multiple cloning site to the opposite direction of xylA promoter in pXA600, named pXAR600. For the measurement of expression level, 3,048 bp of lacZ structural gene was fused into xylA promoter in both plasmids pXA600 and pXAR600 as a reporter gene, named pXA600-lacZ and pXAR600-lacZ, respectively. The $\beta$-galactosidase activity of pXA600-lacZ and pXAR600-lacZ in E. coli JM109 was determined to be 1,641 and 2,304 unit by the induction with xylose in LB medium, respectively. The $\beta$-galactosidase activity of pXAR600-lacZ/JM109 was about 1.4 times higher by the induction with xylose than that of pXA600-lacZ/JM109. The $\beta$-galactosidase activity of pXA600-lacZ and pXAR600-lacZ in E.coli JM109 showed 6,282 and 9,320 unit by the induction with xylose in DM minimal medium, respectively. A regulator, xylR protein works as an activator for the gene expression by the addition of xylose in the xylose-inducible vectors because the level of gene expression in pXA600 is increased by the insertion of xylR gene into the same vector. The xynA gene of Streptomyces thermocyaneoviolaceus cloned in pXA600 and pXAR600 was successfully expressed in E. coli BLR(DE3). As a result, plasmids pXA600 and pXAR600 using xylA promoter are sufficient as new expression system to produce a foreign protein in E. coli.
Journal of the Korea Academia-Industrial cooperation Society
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v.12
no.5
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pp.2115-2123
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2011
The purpose of this study is to draw a general conclusion through summing up theses on parents' need for their education up to the present. The subjects of this study are 25 masters' degree theses on parents' need for their education in the kindergarten from 2001 to 2010. The results of data on parents' education method and style were conducted by frequency analysis. Also it was surveyed if in how many theses the contents of parents' education were rated over average points by Licker. The results of this study are as follows: First, the parents think that the proper frequency of their education is once or two in a semester and the favorite time is from 10 to 12 o'clock or from 2 p. m. to 4 p.m. They also want to learn on Wednesday, Friday and Saturday. And they want a professional as their lecturer the most and then a homeroom teacher. Secondly, in the survey of their education style they like more lecture or a short course than any other thing, and then they like home messenger, group council and so on. But especially they don't like the style of visiting class, book lending, ceremony/class assistance, practice (workshop), and visiting home. Thirdly, they want to know a general guide in the kindergarten of the contents of their education a lot. And they want to know some of a budget, program, and assessment of a principal and the teachers in the kindergarten. Fourthly, they want to know all parts of the parents' roles related to rearing their children in their own elements of the contents of their education above all. And they also want strongly their free time, hobby, the liberal arts, amusement and recreation. Fifthly, in the view of infant development they want strongly to know how to communicate with their children rightly, and how to adjust their children's activities and how to praise or blame their children. And they also want how to form their children's right habit and to guide their children's right acts in the infant period the most. Lastly, they want to know children's physical development and their cognitive development in the view of infant development the most. And then they want to know the development of sociology, creativity, morality, and emotion in good order.
Malignant pleural effusions are most commonly associated with lung cancers, however, it also can be resulted from breast cancers, ovarian cancers, stomach cancers and so on. According to the their histologic types, adenocarcinoma have been known as the most common cell type of malignant pleural effusions and squamous cell carcinoma is rare. We herein present incidences, clinical characteristics and survivals of malignant pleural effusions according to their cell types and primary diseases. The objects are 84 malignant pleural effusion patients diagnosed by pleural fluid cytologic examination or pleural biopsy from Jan. 1992 to May. 1997 in Seoul National University Hospital. A retrospective chart review on their histologic types, biochemical parameters and survivals is described. Among 84 patients, 52 were males and the other 32 were females with 1.6:1 of male and female ratio and their mean age was 57.6 years old. Common symptoms of them wele dyspnea, cough, sputum and pleuritic chest pain. The proportions of bloody nature of effusion, lymphocyte dominant pleural effusion, exudative effusions were 66%, 39% and 93%, respectively. They consisted of 54 cases of adenocarcinoma(33 cases of them were lung cancers), and 10 cases of squamous cell carcinoma (8 cases of them were lung cancers), 10 cases of malignant lymphoma, 8 cases of small cell lung cancer and a case of mesothelioma and leukemia. There was no differences in characteristics of effusions, clinical features and survivals between each histologic cell types. Analyzing them according to primary diseases, no difference except longer survivals in malignant pleural effusions from breast cancer than from other cancers was observed. In conclusion, considering the incidences of histologic types of lung cancers during same period (squamous cell carcinoma; 47%, adenocarcinoma; 33%, small cell lung cancer; 12% and large cell carcinoma; 2%), malignant pleural effusions more likely occurred in adenocarcinoma than other cell types of lung cancers and there was no significant difference of clinical characteristics between histologic types.
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