• Tribology and Lubricants
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• v.33 no.1
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• pp.23-30
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• 2017

The electric controlled marine diesel engine has fuel pump generating the high pressurized fuel for fuel injection to combustion chamber via a common rail. Fuel pump consists of a cam-roller system. Journal bearing installed between a roller and a cam-roller pin is subjected to fluctuating heavy and instant loads by cam lift. First, Kinematic analysis is carried out to predict bearing loads during one cycle acting on the journal bearing. Second, flexible multi-body dynamic analysis and transient elasto-hydrodynamic(EHD) lubrication analysis for journal bearing considering elastic deformation of cam-roller pin, roller and bearing are conducted using AVL EXCITE/PU software to predict lubrication performance. The clearance ratio and journal groove shape providing lubrication oil are important parameter in bearing design having good performance and can be changed easier than other design parameters such as diameter, width, oil supply pressure and bearing material grade. Generally, journal bearing performance is represented by the minimum oil film thickness(MOFT) and peak oil film pressure(POFP). As well as the traditional design parameters(MOFT, POFP), in this study, temperature rise of lubrication oil is also evaluated through the side leakage flow of supplied oil. By the evaluating MOFT, POFP and temperature rise, the optimum bearing clearance ratio is decided.

• Journal of the Korean Home Economics Association
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• v.37 no.11
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• pp.59-73
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• 1999

The purpose of the present study was to identify the effect of perceivers’value and religions on the impresson of Korean catholic priest’s ritual dress. The subject consisted of 415 undergraduated students. The experimental materials developed for this study were 3type color photographs stimuli of catholic priest model and 7-point sementic differential scale composed of 49 bipolar adjectives representing personal traits. Perceivers were differenciated by AVL test. The data were analyzed by factor analysis and analysis of variance. The major findings drawl from this study were as follows : 1) Four factors( openness, religious nature, potency, characteristics of apperance) emerged to account for the dimentional structure of the impression of priest’s ritual dress. 2) The ritual dress and perceivers religion had partially significant effect on the impression of the priest. The ritual dress had an effect on openness and potency while the religious of perceivers affected religious symbolism and potency. Black suit with Roman collar and soutan were seen more authoritative, strong and independent than liturgical vestments. Catholic group saw priest with ritual dress more pure and potent than the other religious groups. 3) The ritual dress and perceiver’s value had partially significant effect on the impression of the priest. The ritual dress had an effect on openness, potency and the value had an significant interaction effect on potency. The group with political value perceived the priest with soutan more potent than black suit with Roman collar and liturgical vestments. Therefore the ritual dress and perceivers’value/religion had significant erect on Korean priest impression of openness, religious nature, potency. Research had also shown the similarity-attraction hypothesis which the individuals who hold similar characterisics are more Likely to be attracted.

• Journal of Oriental Neuropsychiatry
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• v.3 no.2
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• pp.1-33
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• 1992

In order to observe clinical effect of Gamikeguntang(加味柱芎湯) and Gamikuyibitang(加味歸脾湯), I reached following conclusion through the clinical pathology and physicohemical investigation, The following results were obtained. 1) The amplirude on AVL lead which is observed in ECG was increased significantly both in medication group of Gamikegungtang (加味柱芎湯) and of Gamikegungtang(加味歸脾湯). 2) In Hematology, the values of RBC, Hb and Hct are totally increased in the medication group of Gamikuyibitang(加味歸脾湯). 3) In serum Lipid, Total cholesterol and Tryglyceride are significantly decreased and HDL-cholesteral is significantly increased both in medication group of Gamikegungtang(加味柱芎湯) and Gamikuyibitang(加味歸脾湯). Especiay, HDL-cholesterol is remarkably increased in the medication group of Gamikegungtang(加味柱芎湯). 4) The serum Bile acid is remarkably decreased in the medication group of Gamikegungtang(加味柱芎湯), but is not in the medication group of Gamikuyibitang(加味歸脾湯). 5) The value of Cardiac enzyme is remarkably decreased both in the medication group of Gamikegungtang(加味柱芎湯) and Gamikuyibitnag(加味歸脾湯). especially, in the group of Gamikuybitang(加味歸脾湯). 6) In determination of LDH isoenzyme, $LD_4$ is remarkably decreased in the medication group of Gamikegungtang(加味柱芎湯) and $LD_1\;LD_2$ are remarkably decreased in the medication group of Gamikuyibitang(加味歸脾湯). In view of the result so far achieved, I knew that Gamikegungtang(加味柱芎湯) had an indirect effect on Palpitation which is called mental disorder by means of treatment of liver and gall bladder disease, and that Gamiluyibitang(加味歸脾湯) make increase activation of heart whose blood is deficient( 心血不足). In conclusion, I think that we need comparative studies between the main prescription of Kegungtang(柱芎湯). Kuyibitnag(歸脾湯) and the additional prescription of them from now on.

• Transactions of the Korean Society of Automotive Engineers
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• v.24 no.2
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• pp.144-151
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• 2016

This study effect of engine oils on regulated fuel economy and emissions including particulate matter (PM) to provide basic data for management of engine oil in vehicles. Three engine oils (Group III base oil, Group III genuine oil with additive package and synthetic oil with poly alpha olefins (PAOs)) were used in one gasoline, one LPG(liquefied petroleum gas) and two diesel vehicles. In the case of diesel vehicles, one is a diesel vehicle without DPF (diesel particulate filter) other is a diesel vehicle with DPF. In this study, the US EPA emission test cycle FTP-75, representing city driving, was used. HORIBA, PIERBURG, and AVL gas analyzers were used to measure the fuel economy and regulated emissions such as CO, NOx, and THC. The number of PM was measured using a PPS (pegasor particle sensor). And, the shape of PMs was analyzed by SEM (scanning electron microscope). The effects of oil type on fuel economy, exhaust gas, and PM were not significant because engine oil consumption by evaporation and combustion in the cylinder is very tiny. Fuel and vehicle type were dominant factors in fuel economy and emissions. HC emission from gasoline vehicles was higher than that from other vehicles and NOx emission from diesel vehicles was higher than that from other vehicles. The number of PM was not affected by the engine oil, but by the driving pattern and fuel. The shapes of the PM, sampled from each vehicle using any test engine oil, were similar.

• Journal of Korean Society of Transportation
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• v.22 no.2 s.73
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• pp.145-154
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• 2004

The growing demand for customer-responsive, made-to-order manufacturing is stimulating the need for improved dynamic decision-making processes in commercial fleet operations. Moreover, the rapid growth of electronic commerce through the internet is also requiring advanced and precise real-time operation of vehicle fleets. Accompanying these demand side developments/pressures, the growing availability of technologies such as AVL(Automatic Vehicle Location) systems and continuous two-way communication devices is driving developments on the supply side. These technologies enable the dispatcher to identify the current location of trucks and to communicate with drivers in real time affording the carrier fleet dispatcher the opportunity to dynamically respond to changes in demand, driver and vehicle availability, as well as traffic network conditions. This research investigates key aspects of real time dynamic routing and scheduling problems in fleet operation particularly in a truckload pickup-and-delivery problem under various settings, in which information of stochastic demands is revealed on a continuous basis, i.e., as the scheduled routes are executed. The most promising solution strategies for dealing with this real-time problem are analyzed and integrated. Furthermore, this research develops. analyzes, and implements hybrid algorithms for solving them, which combine fast local heuristic approach with an optimization-based approach. In addition, various partitioning algorithms being able to deal with large fleet of vehicles are developed based on 'divided & conquer' technique. Simulation experiments are developed and conducted to evaluate the performance of these algorithms.

• Journal of the Korean Society of Marine Environment & Safety
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• v.24 no.6
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• pp.834-840
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• 2018

In this study, the characteristics of air pollutant emissions from ships' engines have been investigated by conducting E2 and E3 cycle mode tests. A engine 360Ps (Doosan L126TIH engine) and 400kW dynamometer Horiba-Schenck were utilized for engine tests. The FTIR analyzer and SPC were used to measure exhaust gas (NOx, SOx etc.) and PM (particulate matter), respectively. The results showed that the emissions of THC and CO produced from engine were increased with the increase of sulfur content in fuel oils at E2 and E3 cycle modes. The kinetic viscosity of the fuel increased as the sulfur content of the fuel increased, thereby the specific fuel oil consumption (SFC) of the engine improved. This result is considered to be due to improved combustion conditions due to increased average diameters of sprayed particles and due to increased kinetic viscosity under constant fuel injection pressure in this study. In the case of NOx emission, this study showed no significant change in amount of sulfur content.

• Korean Journal of Soil Science and Fertilizer
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• v.14 no.1
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• pp.31-36
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• 1981

This pot experiment was conducted to find out the optimal fertilization ratio of the anions (N : S : P) in various soil conditions. Soil samples were collected from uncultivated mountains and hills where development for grasslands is under consideration. The optimum ratios were computed by the $Hom{\grave{e}}s$ systematic variation technique. The results were summarized as follows : 1. The optimum fertilization ratios of the anions (N : S : P) for the high yields of grass - clover mixed sward at various areas were obtained (Table 5). 2. The grass yields in mixed sward were increased by the increase of specific soil characteristics, CEC, OM, T-N, avail-$P_2O_5$. However. it was not recognizable by the contents of the cations, the base saturation, and the pH. 3. The relatively high yields of clover were positively related to the Ca and Mg contents in soils, and it was a factor of the increased total yields of mixed sward. 4. The relatively high optimum fertilization ratios of S in volcanic ash soil in the Cheju district and P in sediment lithosol in Daegu should be taken into account in determing the fertilization rate for high yield of clover in mixed sward.