Search results for: D. S. Kim

Items from 1 to 20 out of 185 results

article

A Note on Polyexponential and Unipoly Functions

D. S. Kim, T. Kim

Russian Journal of Mathematical Physics > 2019 > 26 > 1 > 40-49

In this paper, we introduce polyexponential functions as an inverse to the polylogarithm functions, construct type 2 poly-Bernoulli polynomials by using this and derive various properties of type 2 poly-Bernoulli numbers. Then we introduce unipoly functions attached to each suitable arithmetic function as a universal concept which includes the polylogarithm and polyexponential functions as special...

article

High-Voltage Pulse Power Supply for a 1.5 MW Klystron

D. S. Kim, B. K. Lee, S. S. Park, B. H. Choi, more

Journal of the Korean Physical Society > 2018 > 73 > 8 > 1153-1156

This paper deals with a high-voltage pulse power supply for a 1.5 MW klystron. The precision pulse power supply can guarantee stable output power and safety of klystron. The proposed hardtube type high voltage pulse power supply can produced pulses flat-top voltage −90 [kV], pulse width 1.7 [ms], 120 [Hz]. And using auxiliary system called DRC (DRoop Compensator) can improved pulse flatness. The validity...

article

Degenerate r-Stirling Numbers and r-Bell Polynomials

T. Kim, Y. Yao, D. S. Kim, G. -W. Jang

Russian Journal of Mathematical Physics > 2018 > 25 > 1 > 44-58

The purpose of this paper is to exploit umbral calculus in order to derive some properties, recurrence relations, and identities related to the degenerate r-Stirling numbers of the second kind and the degenerate r-Bell polynomials. Especially, we will express the degenerate r-Bell polynomials as linear combinations of many well-known families of special polynomials.

article

A new approach to Catalan numbers using differential equations

D. S. Kim, T. Kim

Russian Journal of Mathematical Physics > 2017 > 24 > 4 > 465-475

In this paper, we introduce two differential equations arising from the generating function of the Catalan numbers which are ‘inverses’ to each other in a certain sense. From these differential equations, we obtain some new and explicit identities for Catalan and higher-order Catalan numbers. In addition, by other means than differential equations, we also derive some interesting identities involving...

article

A carbon contamination cleaning of gold film by electron beam irradiation with minimum structural damages

D. J. Park, T. H. Kang, D. S. Kim, H. T. Kim, more

Journal of the Korean Physical Society > 2017 > 71 > 8 > 467-470

We demonstrate a successful removal of carbon contamination in gold surface simply by exposing relatively low energy electron emitted from field effect scanning electron microscope apparatus. An atomic force microscope image of gold film taken after a few tens of minute exposure of electron beam indicates small morphology change, however, a lateral force microscope image taken simultaneously shows...

article

Recovery‐related indicators of motor network plasticity according to impairment severity after stroke

J. Lee, E. Park, A. Lee, W. H. Chang, more

European Journal of Neurology > 24 > 10 > 1290 - 1299

Background and purpose Brain connectivity analysis has been widely used to investigate brain plasticity and recovery‐related indicators of patients with stroke. However, results remain controversial because of interindividual variability of initial impairment and subsequent recovery of function. In this study, we aimed to investigate the differences in network plasticity and motor recovery‐related...

article

Degenerate Laplace transform and degenerate gamma function

T. Kim, D. S. Kim

Russian Journal of Mathematical Physics > 2017 > 24 > 2 > 241-248

In this paper, we introduce the degenerate Laplace transform and degenerate gamma function and investigate some of their properties. From our investigation, we derive some interesting formulas related to the degenerate Laplace transform and degenerate gamma function.

article

Successful Treatment of a Patient With Diffuse Portosplenomesenteric Thrombosis Using a Pericholedochal Varix for Portal Flow Reconstruction During Deceased Donor Liver Transplantation: A Case Report

Y.-D. Yu, D.-S. Kim, J.-H. Han, Y.-I. Yoon

Transplantation Proceedings > 2017 > 49 > 5 > 1202-1206

Portal vein thrombosis remains a challenging issue in liver transplantation. When thrombectomy is not feasible due to diffuse portosplenomesenteric thrombosis, other modalities are adapted such as the use of a jump graft or portal tributaries or even multivisceral transplantation. For patients with diffuse thrombosis of the splanchnic venous system, a large pericholedochal varix can be a useful vessel...

article

Autologous adipose tissue-derived stem cells for the treatment of complex perianal fistulas not associated with Crohn’s disease: a phase II clinical trial for safety and efficacy

S. Choi, S.-B. Ryoo, K. J. Park, D.-S. Kim, more

Techniques in Coloproctology > 2017 > 21 > 5 > 345-353

Purpose Injection of adipose tissue-derived stem cells (ASCs) is a novel method for the treatment of complex perianal fistulas. We aimed to evaluate the safety and efficacy of ASCs in the treatment of complex anal fistulas not associated with Crohn’s disease. Methods A phase II clinical trial was performed comparing two different doses of ASCs (group 1: 1 × 10⁷ cells/mL and group 2: 2 × 10⁷ cells/mL)...

article

On λ-Bell polynomials associated with umbral calculus

T. Kim, D. S. Kim

Russian Journal of Mathematical Physics > 2017 > 24 > 1 > 69-78

In this paper, we introduce some new λ-Bell polynomials and Bell polynomials of the second kind and investigate properties of these polynomials. Using our investigation, we derive some new identities for the two kinds of λ-Bell polynomials arising from umbral calculus.

article

Leaf chlorophyll fluorescence discriminates herbicide resistance in Echinochloa species

C J Zhang, S H Lim, J W Kim, G Nah, more

Weed Research > 56 > 6 > 424 - 433

Timely detection of herbicide resistance at an early stage of crop cultivation is essential to help farmers find alternative solutions to manage herbicide resistance in their fields. In this study, maximum quantum yield of PS II [F_v/F_m = (F_m – F_o)/F_m] was measured at the 4–5 leaf stage to discriminate between herbicide‐resistant and susceptible biotypes of Echinochloa species. The differences in F...

article

40^th EASD Annual Meeting of the European Association for the Study of Diabetes

M. Veitenhansl, K. Stegner, F.-X. Hierl, C. Dieterle, more

Diabetologia > 2004 > 47 > 1 > A1-A464

article

Artificial neural network prediction of NO_x emissions from EGR and non‐EGR engines running on soybean biodiesel fuel (B5) during cold idle mode

H. Omidvarborna, A. Kumar, D. S. Kim

Environmental Progress & Sustainable Energy > 35 > 5 > 1537 - 1544

Artificial neural network (ANN) prediction scheme was developed for nitrogen oxides (NO_x) emissions in cold idle mode based on the analysis of NO_x emissions from on‐road transit buses operating on a blend of biodiesel. The input data necessary for training and testing the proposed ANN scheme was obtained from two different urban transit buses fueled with 5 vol % soybean methyl ester (SME) and 95%...

article

Factors Delaying Organ Procurement After Declaration of Brain Death in Korea

Y.-D. Yu, S.-J. Kim, Y.-S. Jang, S.-W. Jung, more

Transplantation Proceedings > 2016 > 48 > 7 > 2403-2406

Organ donation after brain death is a major source for obtaining transplantable organs for patients with end-stage organ disease. However, the time from declaring brain death to organ procurement is often longer than expected. Analyzing factors that delay organ procurement may help to prevent damage to organs from marginal and unstable donors and aid in preparation for recipient operation. The aim...

chapter

Atmospheric pressure plasma press for improved adhesion between flexible polymer(Prepreg) and inorganic material(BaTiO3)

M. K. Mun, D. S. Kim, G. Y. Yeom

2016 IEEE International Conference on Plasma Science (ICOPS) > 1

2016 IEEE International Conference on Plasma Science (ICOPS)

For the strongest bonding between two different materials, a novel adhesion process called “plasma press” has been studied using an atmospheric pressure plasma and the effect of plasma press between a flexible substrate (adhesive polymer substrate; Prepreg) and an inorganic material (BaTiO3) has been investigated as an application to the multilayer flexible printed circuit board for next generation...

chapter

A Design of Preventive Integrated Security Management System Using Security Labels and a Brief Comparison with Existing Models

D. S. Kim, T. M. Chung

Lecture Notes in Computer Science > Computational Science and Its Applications – ICCSA 2004 > Information Systems and Information Technologies (ISIT) Workshop, Security Session > 183-190

Many organizations operate and manage their security systems using the ISM technology to secure their network environment effectively. However, the current ISM is passive and behaves in a post-event manner. To reduce costs and resources for managing security and to remove the possibility of an intruder succeeding in attacks, the preventive security management technology is strongly required. In this...

article

Optimal Design of −40-kV Long-Pulse Power Supply

S. C. Kim, H. Heo, C. Moon, S. H. Nam, more

IEEE Transactions on Plasma Science > 2016 > 44 > 4-3 > 694 - 701

This paper proposes a compact high-voltage pulse electron gun power supply (EGPS) consisted of interleaved capacitor-charging power supply (CCPS) with a series-resonant converter (SRC) to drive the electron tube. Requirement specifications are −40 kV, −7 A (280 kW), and continuous output lower than ±1% ripple stability lasted few seconds with <1 ms charging and discharging times. To meet the design...

chapter

Coherent Control of Surface Plasmon Propagation Directions

S. B. Choi, D. J. Park, Y. K. Jung, J. H. Kang, more

Springer Series in Chemical Physics > Ultrafast Phenomena XVI > THz Science and Technology, Nano-Optics and Plasmonics > 699-701

We have demonstrated the directional control of surface plasmon polariton(SPP) waves through propagating in an asymmetric plasmonic Bragg resonator using femtosecond temporal-phase control via the resonant coupling of SPPs and the interference of SPPs. The near-field images display significant temporal-phase dependence, switching between left and right propagation after the Bragg resonator. Our results...

article

Adherence with renal dosing recommendations in outpatients undergoing haemodialysis

G. J. Kim, N. K. Je, D.‐S. Kim, S. Lee

Journal of Clinical Pharmacy and Therapeutics > 41 > 1 > 26 - 33

What is known and objectiveAdjustment of drug dosage in patients with end‐stage renal disease prevents serious adverse effects, which occur due to the accumulation of drugs or other toxic metabolites. Nevertheless, dosing errors occur most commonly among patients with end‐stage renal disease. The aim of this study was to assess the quality of care for end‐stage renal disease outpatients using their...

article

A note on nonlinear Changhee differential equations

T. Kim, D. S. Kim

Russian Journal of Mathematical Physics > 2016 > 23 > 1 > 88-92

In this paper, we study nonlinear Changhee differential equations and derive some new and explicit identities of Changhee and Euler numbers from those nonlinear differential equations.

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INFONA - science communication portal

Search results for: D. S. Kim

A Note on Polyexponential and Unipoly Functions

High-Voltage Pulse Power Supply for a 1.5 MW Klystron

Degenerate r-Stirling Numbers and r-Bell Polynomials

A new approach to Catalan numbers using differential equations

A carbon contamination cleaning of gold film by electron beam irradiation with minimum structural damages

Recovery‐related indicators of motor network plasticity according to impairment severity after stroke

Degenerate Laplace transform and degenerate gamma function

Successful Treatment of a Patient With Diffuse Portosplenomesenteric Thrombosis Using a Pericholedochal Varix for Portal Flow Reconstruction During Deceased Donor Liver Transplantation: A Case Report

Autologous adipose tissue-derived stem cells for the treatment of complex perianal fistulas not associated with Crohn’s disease: a phase II clinical trial for safety and efficacy

On λ-Bell polynomials associated with umbral calculus

Leaf chlorophyll fluorescence discriminates herbicide resistance in Echinochloa species

40^th EASD Annual Meeting of the European Association for the Study of Diabetes

Artificial neural network prediction of NO_x emissions from EGR and non‐EGR engines running on soybean biodiesel fuel (B5) during cold idle mode

Factors Delaying Organ Procurement After Declaration of Brain Death in Korea

Atmospheric pressure plasma press for improved adhesion between flexible polymer(Prepreg) and inorganic material(BaTiO3)

A Design of Preventive Integrated Security Management System Using Security Labels and a Brief Comparison with Existing Models

Optimal Design of −40-kV Long-Pulse Power Supply

Coherent Control of Surface Plasmon Propagation Directions

Adherence with renal dosing recommendations in outpatients undergoing haemodialysis

A note on nonlinear Changhee differential equations

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