D. J. Kim

Korea University

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Kyoung Ho Lee

Chungnam National University

In‐Wha Kim

Seoul National University

Seung Gun Chung

Korea Institute of Science and Technology

Sang Gyun Kang

Korea University

Zofia Czosnyka

Addenbrooke's Hospital

B. Lee

Korea University

Sangyun Lee

Gachon University Gil Medical Center

Matthew Garnett

Addenbrooke's Hospital

Seok Won Hong

Korea Institute of Science and Technology

Eric Schmidt

Université de Toulouse

Cooperative Institutions

Korea University

Seoul National University

Addenbrooke's Hospital

University of Cambridge

Cambridge University Hospitals NHS Foundation Trust

Korea Institute of Science and Technology

Universidade de São Paulo

Charles University

Military University Hospital Prague

Université de Picardie Jules Verne

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Lower Breakpoint of Intracranial Amplitude-Pressure Relationship in Normal Pressure Hydrocephalus

Acta neurochirurgica. Supplementum (2021)

Zofia Czosnyka Afroditi D. Lalou Eva Nabbanja Matthew Garnett Nicole C. Keong

Shunting

Neuroradiology

Normal pressure hydrocephalus

Pulse pressure

10.1007/978-3-030-59436-7_57

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Citations (2)

Polymeric nanofiber web-based artificial renal microfluidic chip

Biomedical Microdevices (2007)

Kyoung Ho Lee D. J. Kim B.G. Min Sangyun Lee

Filtration (mathematics)

Electrospinning

Polyvinylidene fluoride

10.1007/s10544-007-9047-5

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Citations (48)

Determination of moisture content in a deformable soil using time‐domain reflectometry (TDR)

European Journal of Soil Science (2000)

D. J. Kim Sang Il Choi O. Ryszard Jan Feyen Sun Kim

Summary Time‐domain reflectometry (TDR) is being used increasingly for measuring the moisture content of porous media. However, successful application for measuring water in soil has been limited to non‐deformable soils, and it would be a valuable extension of the technique if it could be used for soils that shrink on drying. We have recently investigated its application to soils rich in clay and organic matter and peats. Here we propose a method for determining moisture content in deformable soils based on the relation between the dielectric constant, K , and the volumetric moisture content, Θ, measured by TDR. Parallel TDR probes with a length of 15 cm and a spacing of 2 cm were placed horizontally in soil cores with a diameter of 20 cm and height of 10 cm taken from a forest. The soil is very porous with large proportions of both silt and clay. The sample weight and travel time of the electromagnetic wave guided by parallel TDR probes were simultaneously measured as a function of time, from saturation to oven‐dryness during which the core samples shrank considerably. Vertical and horizontal components of shrinkage were also measured to take the air‐exposed region of TDR probe into account in the determination of K . The effect of deformation on volumetric moisture content was formulated for two different expressions, namely actual volumetric moisture content (AVMC) and fictitious (uncorrected) volumetric moisture content (FVMC). The effects of air‐exposure and expressions of volumetric moisture content on the relation between K and Θ were examined by fitting the observations with a third‐order polynomial. Neglecting the travel time in the air‐exposed part or use of the FVMC underestimated the Θ for a given K . The difference was more pronounced between AVMC and FVMC than between two different dielectric constants, i.e. accounting for air‐exposure, K ac , and not accounting for air‐exposure, K au . When the existing empirical models were compared with the fitted results, most underestimated the relation based on the AVMC. This indicates that published empirical models do not reflect the effect of deformation on the determination of Θ in our forest soil. Correct use of the Θ expression has more impact on determining moisture content of a deformable soil than the accommodation of travel time through the air‐exposed region of TDR probe.

Reflectometry

Silt

Shrinkage

Saturation (graph theory)

10.1046/j.1365-2389.2000.00284.x

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Citations (17)

Development of adsorbent for the simultaneous removal of organic and inorganic contaminants from aqueous solution

Water Science & Technology (2011)

Jae‐Woo Choi Seung Gun Chung Seok Won Hong D. J. Kim S. H. Lee

In this study, a modified adsorbent, alginate complex beads, was prepared and applied to the removal of mixed contaminants from wastewater. The alginate complex beads were generated by the immobilization of powdered activated carbon and synthetic zeolites onto alginate gel beads, which were then dried at 110 °C for 20 h until the diameter had been reduced to 1 mm. This dry technique increased the hardness of the adsorbent to assure its durability and application. The adsorption onto the alginate complex beads of organic and inorganic compounds, as target contaminants, was investigated by performing both equilibrium and kinetic batch experiments. From the adsorption isotherms, according to the Langmuir equation, the alginate complex bead was capable of effectively removing benzene, toluene, zinc and cadmium. From kinetic batch experiments, the removal efficiencies of benzene, toluene, zinc and cadmium were found to be 66.5, 92.4, 74.1 and 76.7%, respectively, for initial solution concentrations of 100 mg L(-1). The results indicated that the adsorbent developed in this study has the potential to be a promising material for the removal of mixed pollutants from industrial wastewater or contaminated groundwater.

Industrial wastewater treatment

Langmuir adsorption model

10.2166/wst.2011.749

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Citations (13)

Verification of effective reactive power reserve with respect to reactive power load demands in the power system

Seungwan Seo Sang Gyun Kang Y. H. Choi D. J. Kim B. Lee

Voltage instability usually occurs when the power systems are heavily stressed. In addition, the voltage instability is associated with not meeting the reactive power demands because of limitations on the production and transmission of reactive power. It may or may not be initiated by a disruption, but is usually characterized by shortage of fast-acting reactive power reserves. Reactive power reserves can be classified according to the load's and the generation's perspective. In terms of loads, the focus is on the margins to collapse while from the generation point of view, the focus is on the amount and value of reserves. This paper defines a improved reactive power reserve from generation's perspective called as. The Effective Var (Q) Reserve'. Conventional reactive power reserve is measured by the difference between the maximum reactive power considering the generator's capability curve and the current reactive power of generator. However, all generators could not affect on the whole power system. Thus, the effective reactive power reserve is computed by sensitivity based on generator reactive power outputs and reactive power loads. The effective reactive power reserve is verified using static and dynamic simulation in the test system and the Korean power system.

Volt-ampere reactive

10.1109/pes.2010.5590138

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Citations (10)

Improved Micrometric Properties of Pyridostigmine Bromide, a Highly Hygroscopic Drug, through Microenccapsulation

Journal of Korean Pharmaceutical Sciences (2002)

D. J. Kim In‐Wha Kim Suk-Jae Chung Chang‐Koo Shim

The purpose of this study is to microencapsulate a highly hygroscopic drug, pyridostigmine bromide (PB), with a waterproof wall material, in order to increase the flowability of the drug particles. Polyvinylacetaldiethylaminoacetate (AEA), Eugragit E and Eugragit RS were examined as the wall materials. Microcapsules containing PB were prepared by the evaporation technique in an acetone/liquid paraffin system using aluminum tristearate as a core material, and evaluated for drug encapsulation efficiency, surface morphology, particle size and drug dissolution. The encapsulation of PB in the wall material was almost complete. Among the wall materials examined, AEA exhibited the most excellency in shape, surface texture, flowability, size distribution of microcapsules. Above results suggest that AEA would be a potential wall material for microcapsulation of highly hygroscopic drugs, such as PB. Through microencapsulation with AEA, inconvenience of handling of PB powders encountered in the process of weighing and packing the powders to tableting die or capsule body could be greatly improved.

Pyridostigmine Bromide

10.4333/kps.2002.32.1.041

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Citations (0)