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Relationship of Hemodynamic Indices and Prognosis in Patients with Liver Cirrhosis
( Soon Koo Baik ),( Myeong Gwan Jee ),( Phil Ho Jeong ),( Jae Woo Kim ),( Sang Won Ji ),( Hyun Soo Kim ),( Dong Ki Lee ),( Sang Ok Kwon ),( Young Ju Kim ),( Joong Wha Park ),( Sei Jin Chang ) 대한내과학회 2004 The Korean Journal of Internal Medicine Vol.19 No.3
Performance Evaluation of a Driving Power Transmission System for 50 kW Narrow Tractors
( Soon-jung Hong ),( Jong-kyou Ha ),( Yong-joo Kim ),( Shaha Nur Kabir ),( Young Woo Seo ),( Sun-ok Chung ) 한국농업기계학회 2018 바이오시스템공학 Vol.43 No.1
Purpose: The development of compact tractors that can be used in dry fields, greenhouses, and orchards for pest control, weeding, transportation, and harvesting is necessary. The development and performance evaluation of power transmission units are very important when it comes to tractor development. This study evaluates the performance of a driving power transmission unit of a 50 kW multi-purpose narrow tractor. Methods: The performance of the transmission and forward-reverse clutch, which are the main components of the driving power transmission unit of multi-purpose narrow tractors, was evaluated herein. The transmission performance was evaluated in terms of power transmission efficiency, noise, and axle load, while the forward-reverse clutch performance was evaluated in terms of durability. The transmission’s power transmission efficiency accounts for the measurement of transmission losses, which occur in the transmission’s gear, bearing, and oil seal. The motor’s power was input in the transmission’s input shaft. The rotational speed and torque were measured in the final output shaft. The noise was measured at each speed level after installing a microphone on the left, right, and upper sides. The axle load test was performed through a continuous equilibrium load test, in which a constant load was continuously applied. The forward-reverse clutch performance was calculated using the engine torque to axle torque ratio with the assembled engine and transmission. Results: The loss of power in the transmission efficiency test of the driving power unit was 6.0-9.7 kW based on all gear steps. This loss of horsepower was equal to 11-18% of the input power (52 kW). The transmission efficiency of the driving power unit was 81.5-89.0%. The noise of the driving power unit was 50-57 dB at 800 rpm, 70-77 dB at 1600 rpm, and 76-83 dB at 2400 rpm. The axle load test verified that the input torque and axle revolutions were constant. The results of the forward-reverse clutch performance test revealed that hydraulic pressure and torque changes were stably maintained when moving forward or backward, and its operation met the hydraulic design standards. Conclusions: When comprehensively examined, these research results were similar to the main driving power transmission systems from USA and Japan in terms of performance. Based on these results, tractor prototypes are expected to be created and supplied to farmhouses after going through sufficient in-situ adaptability tests.
Microsatellite Sequence Variation of Eleven Lineages of European Honeybee(Apis mellifera) in Korea
Soon-Ok Woo,Sang-Hoon Han,Sang-Mi Han,In-Pyo Hong,Yong-Soo Choi,Ha-sik Shim,Myeong-Lyeol Lee 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.10
Honeybees (Apis mellifera) adapted themselves to different geographical and climatical conditions since they had been introduced in Korea. Beekeepers have tried to breed valuable lineages with artificial insemination or conventional mating techniques. However, evaluation of breeding resultants still relies on timeconsuming observation data. Genetical characterization of breeds has proven its usefulness to preserve genetic resources of livestock. In recent years, microsatellites are most commonly used to evaluate population structures and diversities of living organisms in that the characteristics of locus specificity, rich polymorphism, abundant and random distribution over the genome, and their co-dominant inheritance. Determining classic genetic distances using neutral, highly polymorphic microsatellite markers is a reliable method to investigate genetic relationships and breed differentiation. This methodology can be used to establish preservation priorities for livestock breeds. The final aim of this study was to develop potent markers for assessing genetic structure of lineages after artificial insemination. In this study, the genetic structure of ten microsatellite markers were sequenced or analysed with polymerase chain reaction for eleven European honeybee populations. The results may help to develop reliable microsatellite markers for more efficient preservation strategies of valuable honeybee breeds.
Soon-Ok Jeon,Hyun-Seok Lee,Young-Min Jeon,Joon-Woo Kim,이칠원,공명선 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.4
New spiro[fluorene-7,9′-benzofluorene]-based blue host material, 5-phenyl-spiro[fluorene-7,9′-benzofluorene] (BH-1P), was successfully prepared by reacting 5-bromo-spiro[fluorene-7,9′-benzofluorene] (1) with phenyl boronic acid through the Suzuki reaction. 5-(N,N-Diphenyl)amino-spiro[fluorene-7,9′-benzofluorene] (BH-1DPA) and diphenyl-[4-(2-[1,1;4,1]terphenyl-4-yl-vinyl)-phenyl]amine (BD-1) were used as dopant materials. 2,5-Bis-(2',2"- bipyridin-6-yl)-1,1-diphenyl-3,4-diphenylsilacyclopentadiene (ET4) and Alq3 were used as electron transfer materials. Their UV absorption, photoluminescence and thermal properties were examined. The blue OLEDs with the configuration of ITO/DNTPD/α-NPD/BH-1P:5% dopant/Alq3 or ET4/LiF-Al prepared from the BH-1P host and BH-1DPA and BD-1 dopants showed a blue EL spectrum at 452 nm at 10 V and a luminance of 923.9 cd/m2 with an efficiency of 1.27 lm/W at a current density of 72.57 mA/cm2.