Background: This study was undertaken to investigate the outcome of composite graft aortic root replacement using coronary button reimplantation technique for the treatment of aneurysms of the ascending aorta involving the aortic root. Material and Method: Between April 1995 and September 2001, 54 patients having aortic root replacement with a composite valve graft using direct coronary button reimplantation were reviewed retrospectively. Left ventricular dysfunction was present in 14 patients(25.9%), aortic regurgitation in 48(89%), and Marfan's syndrome in 17(31.5%). The indications for operation were annuloaortic ectasia in 29 patients(53.7%), aortic dissection in 11(20.4%), aneurysms of the ascending aorta involving aortic root in 12(22.2%), and aortitis in 2(3.7%). Six patients(11.1%) had previous cardiac or ascending aortic operations. Concomitant procedures were arch replacement in 21 patients(38.9%), coronary artery bypass graft in 7(13%), mitral valve repair or replacement in 4(7.4%), and others in 6. The mean time of circulatory arrest, total bypass, and aortic crossclamp were 18 $\pm$ 9 minutes, 177 $\pm$ 42 minutes, and 127 $\pm$ 31 minutes, respectively. Result: There was 1 early death(1.9%). Mean follow-up was 24.6$\pm$ 19.5 months. There were two late deaths(3.8%) including one death due to the traumatic cerebral hemorrhage. The Kaplan-Meier survival rate was 98.0 $\pm$ 2.0% and 93.1 $\pm$ 5.1% at 1 and 6 years, respectively. Two patients required reoperation owing to a false aneurysm at the root anastomosis site and a malfunction of prosthetic aortic valve(3.8%). Staged operation for dissection of the remaining thoracoabdominal aorta was performed in 1 patient. The freedom rate from reoperation was 97.8 $\pm$ 2.0% and 65.3 $\pm$ 26.7% at 1 and 6 years, respectively.
Journal of the Korean Society of Fisheries and Ocean Technology
/
v.14
no.2
/
pp.97-112
/
1978
The rule 15, 16 and 17 of International Regulations for Preventing collisions at Sea direct actions to avoid collision when two power-driven vessels are crossing. But these rules do not present the safety minimum approaching distances outside which a give- way vessel deeps out of the way of a stand-on vessel. In this paper, the author analyzed the ship's collision avoiding actions from a viewpoint of ship kinematics as the method to calculate this distance. The author worked out mathematic formulas for calculating the safety minimum approaching distances outside which the give-way vessel takes the actions to avoid collisions in accordance with the cross angles of the crossing vessels' courses. Figuring out actually the values of maneuvering indices of the M. S. Koan Ack San (GT: 224tons), the training ship of the National Fisheries University of Busan and the M. S. Golden Clover (GT: 101, 235tons) of the Eastern Shipping Co., Ltd. through their Z test, the author applied these values to the calculating formulas and calculated the safety minimum approaching distances. The results of calculations are as follows; 1. The greatest distance is to be kept by the give-way vessel to avoid collision when the cross angle of courses is 90$^{\circ}$ or near it. In such case the safety minimum approaching distance of a small vessel must be more than 5 times of her own length and that of a large vessel more than 11 times of her own length. 2. Collision danger is greater when crossing angle is obtuse than in an acute angle, therefore greater distance is to be kept by the give-way vessel to avoid collision in the case of the obtuse angle. 3. The actions to be taken to avoid collisions by the give-way vessel in Rule 16 and by the stand-on vessel in Rule 17(a)(ii) of International Regulations for Preventing Collisions at Sea, must be done outside the above safety minimum approaching distance. When inevitably such actions are to be taken within the safety minimum approaching distance, they should be accompanied with engine motions.
Background : The two most important purposes of fiberoptic bronchoscopy in lung cancer patients are obtaining tissue diagnosis and staging. The direct sign of lung cancer on FOB includes visible tumor, with smooth or nodular surface, with or without necrosis and infiltration. Variant cell types of lung cancer have their characteristic biological behaviors respectively. For example, squamous cell carcinoma grows slowly, invades locally and has easy necrosis resulting in cavitation, whereas adenocarcinoma shows early metastasis, small cell carcinoma shows rapid growth and higher early metastasis rate. Based on this, it could be hypothesized that each cell type may have characteristic bronchoscopic finding. Method : To answer this question, we reviewed 106 cases which were diagnosed as primary lung cancer and had bronchoscopically visible specific cancerous lesions. Results : The results were as follows. 1) Squamous cell carcinoma accounted for 66 cases(62.2%), adenocarcinoma 15 cases(14.2%), large cell carcinoma 3 cases(2.8%). 2) The endobronchial tumor lesion was arbitrarily classified into 5 types according to gross characteristics. Type A, multilobulating mass with necrosis, accounted for 24.5%, type B, multilobulating mass without necrosis, 25.5%, type C, round beefy mass, 9.4%, type D, infiltration with mucosal irregularity, 6.6%, and type E, infiltration without mucosal irregularity, 34%. 3) The analysis of correlation between endobronchial tumor pattern and specific cell type revealed that squamous cell carcinoma had relation with the morphologic type B and small cell carcinoma had relation with the morphologic type E, but adenocarcinoma had no preponderance in morphologic type. The gross appearance had influence on the diagnostic yields of biopsies and the diagnostic yields of lobulating mass types(type A, B) were higher than those of other types. Conclusion : From the above observations, it could be concluded that squamous cell carcinoma and small cell carcinoma have relations with specific types of bronchoscopic morphology, but not the case in adenocarcinoma.
Kim, Sang-Soon;Kim, Jung-Nam;Park, Jung;Kim, Ok-Ran;Cha, Kyung-Mi;Kwak, Ou-Ke;Park, Kyung-Min;Choi, Yoon-Hee;Bak, Kyung-Shin
Research in Community and Public Health Nursing
/
v.4
no.1
/
pp.67-76
/
1993
The purpose of this study was to find the status of health examination and health management of industrial companies located in Taegu and Kyung book areas. It will provide basic information for the provision of effective health management of industrial workers. 49 companies were selected as a study sample group, and data was collected by using a structured Questionnaire which was developed by the members of the Community Health Nursing Academy of Korean Nursing. The health managers of the companies filled out the Questionnaire. The data was gathered from Dec 20, 1992 to Jan 20. The results of the study was as follows : 1. The Study sample showed 85.7% manufacturing companies having 300 or more workers. 2. All the companies had health managers, and companies which had 1,000 or more workers had industrial physicians and nurses. Only 12.2% of the industrial physicians were full time employees, and almost all industrial nurses were full time employees. Except for industrial physicians and nurses, the proportion of hygienists (6.1%), nurses aids (4.1%), and environmental engineers (22.4%) with full time employment statuss was very low. The mean age of industrial physicians was 49.2 while that of industrial nurses was 27.2. The length of work experiences currently ranges for 1 to 3 years for all health workers: physicians, nurses, hygienists, and environmental engineers. 3. Health examination and follow up care 94.31% took general health examinations. Of those, the proportion of the workers, who were determined as C grade(in need of close examination) was 43.86%. The proportion of the workers who were determined as D grade was 22.19%. 13.28% of the workers evaluated at the D grade were taken as a gauge for temporary leave from work. While 8.7% and .09% of them were taken as gauge for a change in job, and or shortening work hours respectively. The proportion of workers who must have taken special examination was 65.04% and of those the proportion of the workers who actually took, the examination was 98.55%. 75% of the workers who were recommended for follow up care were given follow up care. The special examinations were done the most frequently to detect the effects of physical agents (59.2%). Direct notice to individual workers was used the most frequently as a method of notification after a special examination (61.2%). The length of time taken to receive the result of a special examination was less than 1 month (38.9%) and 36.7% had taken up to two months (36.7%.). Most results of special examination were obtained within 2 months. The referral rate of consulting special examination by health managers was estimated at 95.9%. 4. 89.8% of the companies had. their own company dispensaries and 75.5% of those. had separate dispensaries. 32.7% of the companies designated local clinics for health management of workers. Industrial nurses performed health examination the most frequently(1.4 points). Health appraisal for work places were. done the least(0.83 points).
Natural gas has been regarded as one of major alternative fuels, because of the increment of mining shale gas and supplying PNG(Pipeline Natural Gas) from Russia. Thus, it needs to broaden the usage of natural gas as the increasing its supplement. In this situation, application of natural gas on the transport area is a good suggestion to reduce exhaust emissions such as CO2(carbon dioxides) and soot from vehicles. For this reason, natural gas can be applied to SI(spark ignition) engines due to its anti-knocking and low auto-ignitibility characteristics. Recently, since turbocharged SI engine has been widely used, it needs to apply natural gas on the turbocharged SI engine. However, there is a major challenge for using natural gas on turbocharged SI engine, because it is hard to make natural gas direct injection in the cylinder, while gasoline is possible. As a result, there is a loss of fresh air when natural gas is injected by MPI (multi-point injection) method under the same intake pressure with gasoline-fueled condition. It brings the power reduction. Therefore, in this research, intake pressure was increased by controling the turbocharger system under natural gas-fueled condition to improve power output. The goal of improved power is the same level with that of gasoline-fueled condition under the maximum torque condition of each engine speed. As a result, the maximum power levels, which are the same with those of gasoline-fueled conditions, with improved brake thermal efficiency could be achieved for each engine speed (from 2,000 to 6,000 rpm) by increasing intake pressure 5-27 % compared to those of gasoline-fueled conditions.
Yellow poplar (Liriodendron tulipifera L.) has low germination rate relatively other species, so the seedling production of Yellow poplar is a hard task. Accordingly this study was conducted to determine the optimal germination conditions for healthy seedling production and to promote survival rate after afforestation. Gemination percentage was examined at different media and seed covering materials using planting flats in the greenhouse. The best germination percentage was observed in sand for media and compound soil for covering materials. But it was time to transplant, seedlings became a poor character (i.e. height, root length, number of root, dry weight) in sand for media. In order to produce healthy seedlings, each different medium was compounded with TKS-2 (this is a gardening bed soil.) in the ratio 1:1 (v/v.), and compared two conditions. Quality of seedling was better than not mixed TKS-2 into each medium. Transplanting seedlings from greenhouse to nursery grew up rapidly 2 months later (early in August~early in October). Growth amount during two months corresponded to 85.6% and 71.3% in total growth amount of height and diameter at root collar, respectively. In the case of the competition-density effect on yellow-poplar seedlings, direct seedling produced the maximum 35 standard seedlings above 8 mm of root collar diameter per $m^2$, while transplanting seedling produced the maximum 64 standard seedlings per $m^2$. And produced seedlings of two way were significantly different rootlet while axial root and lateral root was not significantly different.
KSCE Journal of Civil and Environmental Engineering Research
/
v.6
no.4
/
pp.21-28
/
1986
Conversion of anaerobic mesophilic digestion to thermophilic range has been investigated using a synthetic sludge. When temperature was raised at a rate of 2, 1, and $0.5^{\circ}C$ per day with continuous feeding, a lower reaction rate was observed with a high rate of temperature change. Although methane fermentation ceased completely for an digesters at thermophilic temperature, acid fermentation continued. Methane fermentation was never achieved even with neutralization during 6 months of resting. The methane formers were completely inactivated by the temperature shock and accumulation of volatile acids due to continuous feeding, while the acid formers lost biological activity quickly, but gradually acclimated to a high temperature. When temperature was raised without feeding, successful thermophilic digestion was achieved with 1 day of resting at thermophilic temperature at a rate of $1^{\circ}C$ per day, and also achieved with 20 days of resting at a direct increase. Conversion to a thermophilic range is easily achieved with resting. A short period of resting is required at a low rate of temperature increase, while a long period of resting enough to balance methane formers with acid fermers makes a conversion possile when temperature is raised at a high rate. Soured thermophilic digesters were recovered after seeding of mesophilic sludges, and sludge seeding could be a good method of start-up, conversion, or recovery of a thermophilic digester. Significant amount of thermophiles seemed to be present in the mesophilic digesters.
Open Source Software Development (OSSD) differentiates itself from traditional closed software development in that it reveals its source codes online and allows anyone to participate in projects. Even though its success was in doubt, many of the open collaborative working models produced successful results. Academia started to get interested in how developers are willing to participate even when there are no extrinsic rewards for their efforts. Many studies tried to explain developers' motivations, and the pursuit of ideology, reputation, and altruism are found to be the answers. Those studies, however, focused mostly on how the first contribution is made out of a certain motivation. Nowadays, OSSD reaches at its maturity and 70% of professional developers have used or utilized open source software or code in their works. As the proportion of people experiencing OSS, the accounts from previous studies are expected to be weakened. Also, extant literature fails to explain how the motivation of participating in OSS evolves over time and experiences. Given that changing over time or over experiences is the natural in the perception of motivation, studies in an attempt to understand how the motivation changes or evolves are in need. In this study, we aimed to explain how the perception about OSS from past usage or related experiences leads to the intention to sustain OSS participations. By doing so, we try to bridge the gap between previous studies and the actual phenomenon. We argued that perceived instrumentality about OSS learned from past experiences will first affect the formation of organizational identity towards general OSS community. And once the organizational identity is formed, it will affect the one's following behaviors related to OSS development, most likely to sustain the favoring stance toward OSS community. Our research distinguishes itself from previous one in that it divides the paths from organizational identity formed to the intention to sustain the voluntary helping behaviors, by altruistic and conforming intentions. Drawing on this structural model, we could explain how organizational identity engages in forming the sustaining intention from past experiences, and that the intention to help at individual level and organizational level works at different level in OSS community. We grounded our arguments on Social identity theory and Organizational Citizenship theory. We examined our assumption by constructing a structural equation model (SEM) and had 88 developers to answer our online surveys. The result is analyzed by PLS (partial least square) method. Consequently, all paths but one in our model are supported, the one which assumed the association between perceived instrumentality and altruistic intention. Our results provide directions in designing online collaborative platforms where open access collaboration is meant to occur. Theoretically, our study suggests that organizational citizenship behavior can occur from organizational identity, even in bottom-up organizational settings. More specifically, we also argue to consider both organizational level and individual level of motivation in inducing sustained participations within the platforms. Our result can be interpreted to indicate the importance of forming organizational identity in sustaining the participatory behaviors. It is because there was no direct association between perceived instrumentality from past experiences and altruistic behavior, but the perception of organizational identity bridges the two constructs. This means that people with no organizational identity can sustain their participations through conforming intention from only the perception of instrumentality, but it needs little more than that for the people to feel the intention to directly help someone in the community-first to form the self-identity as a member of the given community.
Journal of the Korean Institute of Landscape Architecture
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v.45
no.5
/
pp.97-104
/
2017
Greenspace enlargement through proper landscape planting is essential to creating a low carbon society. This study analyzed changes in stem diameter growth rates(DGR), ratios of below ground/above ground biomass(B/A), and carbon sequestration by age of major landscape tree species. Landscape trees for study were 11 species and 112 individuals planted in middle region of Korea. The DGR and B/A were analyzed based on data measured through a direct harvesting method including root digging. The carbon sequestration by tree age was estimated applying the derived regression models. The annual DGR at breast height of trees over 30 years averaged 0.72 cm/yr for deciduous species and 0.83 cm/yr for evergreen species. The B/A of the trees over 30 years averaged 0.23 for evergreen species and 0.40 for deciduous species, about 1.7 times higher than evergreen species. The B/A by age in this study did not correspond to the existing result that it decreased as tree ages became older. Of the study tree species, cumulative carbon sequestration over 25 years was greatest with Zelkova serrata(198.3 kg), followed by Prunus yedoensis(121.7 kg), Pinus koraiensis(117.5 kg), and Pinus densiflora (77.4 kg) in that order. The cumulative carbon sequestration by Z. serrata offset about 5% of carbon emissions per capita from household electricity use for the same period. The growth rates and carbon sequestration for landscape trees were much greater than those for forest trees even for the same species. Based on these results, landscape planting and management strategies were explored to improve carbon sequestration, including tree species selection, planting density, and growth ground improvement. This study breaks new ground in discovering changes in growth and carbon sequestration by age of landscape trees and is expected to be useful in establishing urban greenspaces towards a low carbon society.
The $SO_2$ reduction using CO and $H_2$ over Sn-Zr based catalysts was performed in this study. Sn-Zr based catalysts with Sn/Zr molar ratio (0/1, 1/4, 1/1, 2/1, 3/1, 1/0) were prepared by the precipitation and co-precipitation method. The effect of the temperature on the reaction characteristics of the $SO_2$ reduction with a reducing agent such as $H_2$ and CO was investigated under the conditions of space velocity of $10,000ml/g_{-cat.}h$, $([CO(or\;H_2)]/[SO_2])$ of 2.0. As a result, the activity of Sn-Zr based catalysts were higher than $SnO_2$ and $ZrO_2$. The reactivity for the $SO_2$ reduction with CO was higher than that with $H_2$, and sulfur yield in the $SO_2$ reduction by $H_2$ was higher than that by CO. The reactivity for the $SO_2$ reduction with $H_2$ was increased with the reaction temperature regardless of Sn-Zr based catalyst with a Sn/Zr molar ratio. $SnO_2-ZrO_2$ (Sn/Zr=1/4) had highest activity at $550^{\circ}C$, in the $SO_2$ reduction with $H_2$ and $SO_2$ conversion of 94.4% and sulfur yield of 66.4% were obtained at $550^{\circ}C$. On the other hand, in the $SO_2$ reduction by CO, the reactivity was decreased with the increase over $325^{\circ}C$. At the optimal temperature of $325^{\circ}C$, $SO_2$ conversion and sulfur yield were about 100% and 99.5%, respectively, in the $SO_2$ reduction over $SnO_2-ZrO_2$ (Sn/Zr=3/1). Also, the $SO_2$ reduction using syngas with $CO/H_2$ ratio over $SnO_2-ZrO_2$ (Sn/Zr=2/1) was performed in order to investigate the application possibility of the simulated coal gas as the reductant in DSRP. As a result, the reactivity of the $SO_2$ reduction using syngas with $CO/H_2$ ratio was increased with increasing the CO content of syngas. Therefore, it could be known that DSRP using the simulated coal gas over Sn-Zr based catalyst is possible to be realized in IGCC system
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