Ho Won Jeong - Academia.edu (original) (raw)

Papers by Ho Won Jeong

Geosciences Journal, 2006

Groundwater can be used as an alternative renewable and clean energy source for space heating and... more Groundwater can be used as an alternative renewable and clean energy source for space heating and cooling. Hydrogeologic conditions of Korea were evaluated for application of groundwater heat pumps (GWHPs), especially for open-loop system. Groundwater data obtained from the national groundwater monitoring stations (NGMSs) were used for the purpose. Temperatures of shallow and deep groundwaters are between 1.2–25.8°C and their annual variations are mostly within 10°C. Especially the small amplitude of variation for deep groundwaters can facilitate design and maintenance of groundwater heat pumps. Groundwater levels for shallow and deep wells are located at average 4.79–6.07 m below ground surface. The shallow water levels are most promising for groundwater heat pumps, which reduces pumping costs. A large number of monitoring wells showed a good well yield exceeding a requirement for 3 RT heat pumps for small residential purposes but a limited application is expected for large commercial uses with the single well. Some proportions of shallow and deep groundwaters exhibited scaling and corrosion potentials in respect to hardness, pH, electrical conductivity, total dissolved solids, bicarbonate and chloride. Each relevant parameter was separately evaluated in this study but the parameters are closely correlated. Thus for more detailed and quantitative examination of water quality conditions for GWHPs, integrated and extensive chemical analysis of groundwaters are essentially required.

Transactions of The Korean Society of Mechanical Engineers A, 2009

Reliability analysis is of great importance in the advanced product design, which is to evaluate ... more Reliability analysis is of great importance in the advanced product design, which is to evaluate reliability due to the associated uncertainties. There are three types of uncertainties: the first is the aleatory uncertainty which is related with inherent physical randomness that is completely described by a suitable probability model. The second is the epistemic uncertainty, which results from the lack of knowledge due to the insufficient data. These two uncertainties are encountered in the input variables such as dimensional tolerances, material properties and loading conditions. The third is the metamodel uncertainty which arises from the approximation of the response function. In this study, an integrated method for the reliability analysis is proposed that can address all these uncertainties in a single Bayesian framework. Markov Chain Monte Carlo (MCMC) method is employed to facilitate the simulation of the posterior distribution. Mathematical and engineering examples are used to demonstrate the proposed method.

Journal of Industrial and Engineering Chemistry, 2010

International Studies, 1996

... In the May Day address in 1988, he criticized the country's overdependence on cocoa,... more ... In the May Day address in 1988, he criticized the country's overdependence on cocoa, the prices of which are outside Ghanaian control.“ Labour is also suspicious of the Government's relations with the IMF and the World Bank. ... vol. 86, no. 520, May 1987. p. 227. "' Yao Graham. ...

This paper examines how various components of peace building programmes in different sectors can ... more This paper examines how various components of peace building programmes in different sectors can be co-ordinated. It starts with the examination of the practice by various co-ordinating mechanisms applied to post-conflict peace building operations.

We report on the demonstration of a high-pressure luminous plasmoid of oblate-spheroidal shape in... more We report on the demonstration of a high-pressure luminous plasmoid of oblate-spheroidal shape in an electrodeless high-intensity discharge (ELS-HID) lamp excited by circularly polarized microwaves (CPMs). Conventional ELS-HID lamps are discharged in a TE11 mode in a circular microwave cavity, and as such they generate a prolate-spheroidal (PS) plasmoid in the bulb. In order to avoid formation of localized hot spots in the bulb owing to such a PS plasmoid, the bulb is mechanically rotated. In our ELS-HID lamps, the bulb (30 mm in diam), containing a few mg of a molecular radiator such as di-sulfur or indium bromide and 10 torr of argon, is placed stationary in a circular waveguide. CPMs are generated using a quarter-wave elliptical waveguide excited by a 2.45 GHz magnetron. In full power operation at 1 kW, the bulb is uniformly filled with a bright white-light plasmoid with the luminance in excess of 7E7 cd/m2. As the power is lowered so that the plasmoid does not fill the bulb, the formation of an oblate spheroid of plasmoid of uniform intensity is observed in the middle of the bulb, confirming rotating plasma discharges by CPMs.

International Journal of Adhesion and Adhesives, 2011

This study investigated the relationship between the hydrolytic stability and the crystalline reg... more This study investigated the relationship between the hydrolytic stability and the crystalline regions of cured UF resins with different formaldehyde/urea (F/U) mole ratios to better understand the hydrolysis of cured urea-formaldehyde (UF) resin adhesives responsible for its formaldehyde emission in service. As the F/U mole ratio decreased, the hydrolytic stability of cured UF resins improved, but decreased when the particle size of the resin was reduced. To further understand the improved hydrolytic stability of cured UF resin with lower F/U mole ratios, X-ray diffraction (XRD) was extensively used to examine the crystalline part of cured UF resins, depending on F/U mole ratios, cure temperature and time, hardener type and level. Cured UF resins with higher F/U mole ratios (1.6 and 1.4) showed amorphous structure, while those with lower F/U mole ratios (1.2 and 1.0) showed crystalline regions, which could partially explain the improved hydrolytic stability of the cured UF resin. The crystalline part intensity increased as cure temperature, cure time and hardener content increased. But the 2y angles of these crystalline regions did not change, depending on cure temperature and time, hardener type and level, suggesting that the crystalline regions of the cured UF resin were inherent. This study indicates that the crystalline regions of cured UF resins with lower F/U mole ratio contribute partially to the improved hydrolytic stability of the cured resin.

Applied Physics Letters, 2004

Thermal analysis of wafer-level packaged LEDs with red, green and blue multi-chips are investigat... more Thermal analysis of wafer-level packaged LEDs with red, green and blue multi-chips are investigated. With Si-MEMS technology, wafer-level packaged LEDs are useful for the high power applications such as back light unit (BLU) and general solid state lighting due to the compactness and integrated fabrication process. In this paper, thermal characteristics of wafer-level packaged white LEDs with multi-chips are investigated using both serial and matrix measurement methods.

Molecular Phylogenetics and Evolution, 1998

The complete nucleotide sequence of the mitochondrial genome of the domestic dog, Canis familiari... more The complete nucleotide sequence of the mitochondrial genome of the domestic dog, Canis familiaris, was determined. The length of the sequence was 16,728 bp; however, the length was not absolute due to the variation (heteroplasmy) caused by differing numbers of the repetitive motif, 5'-GTACACGT(A/G)C-3', in the control region. The genome organization, gene contents, and codon usage conformed to those of other mammalian mitochondrial genomes. Although its features were unknown, the "CTAGA" duplication event which followed the translational stop codon of the COII gene was not observed in other mammalian mitochondrial genomes. In order to determine the possible differences between mtDNAs in carnivores, two rRNA and 13 protein-coding genes from the cat, dog, and seal were compared. The combined molecular differences, in two rRNA genes as well as in the inferred amino acid sequences of the mitochondrial 13 protein-coding genes, suggested that there is a closer relationship between the dog and the seal than there is between either of these species and the cat. Based on the molecular differences of the mtDNA, the evolutionary divergence between the cat, the dog, and the seal was dated to approximately 50 +/- 4 million years ago. The degree of difference between carnivore mtDNAs varied according to the individual protein-coding gene applied, showing that the evolutionary relationships of distantly related species should be presented in an extended study based on ample sequence data like complete mtDNA molecules.

Genes & Genetic Systems, 2001

To determine the genetic relationships among domestic dog breeds, we performed both a sequence co... more To determine the genetic relationships among domestic dog breeds, we performed both a sequence comparison of mitochondrial DNA (mtDNA) and an amplified fragment length polymorphisms (AFLP) analysis. Three of four regions of mtDNA, cytochrome b, cytochrome oxidase subunit II, and 16S rRNA genes were highly homogeneous among dog breeds, whereas the other region, the control region, showed relatively high polymorphisms with a maximum percentage difference of 3.18%. However, the control region showed extensive polymorphism even within breeds, and the relationship tree derived from the data could not clearly delimit distinct breeds. 19 EcoRI/MseI primer combinations were used to generate AFLP markers among 25 dogs from 11 breeds including three Korean native dogs. These amplification reactions allowed the detection of more than 1900 amplification products of which 408 were identified as polymorphic bands. Unrooted neighbor-joining tree based on dissimilarity values showed that the Korean native dogs were clustered together with the Asian dogs and that the Asian originated dogs were clustered separately from Western originated dogs. A consensus tree using parsimony method also showed Korean native dogs were grouped separately from the other dogs with moderate bootstrap values. Taken together, it is concluded that AFLP analysis is a more informative tool for revealing genetic relationships among dog breeds than mtDNA sequence comparison.