Search results for: Yong-Su Kim

Items from 1 to 20 out of 49 results

article

Practical Sensitivity Bound for Multiple Phase Estimation with Multi‐Mode $N 00 N$ States

Seongjin Hong, Junaid ur Rehman, Yong‐Su Kim, Young‐Wook Cho, more

Laser & Photonics Reviews > 16 > 9 > n/a - n/a

Quantum enhanced multiple phase estimation is essential for various applications in quantum sensors and imaging. For multiple phase estimation, the sensitivity enhancement is dependent on both quantum probe states and measurement. It is known that multi‐mode

N 00 N

states can outperform other probe states for estimating multiple phases. However, it is generally not feasible in practice to implement...

article

A Model for Risk Cost and Bidding Price Prediction based on Risk Information in Plant Construction Projects

Hyun-Wook Kang, Yong-Su Kim

KSCE Journal of Civil Engineering > 2018 > 22 > 11 > 4215-4229

The purpose of this study is to predict the risk cost and the bidding price of a plant construction project based on the surveyed risk information. This is carried out by analyzing the risk information of completed plant construction projects and by applying it to a new project. Accordingly, a model structure is designed and a prototype program is developed for the analysis. In addition, a case study...

chapter

Non-zero discord bipartite state generation via classical second-order interference

Yong-Su Kim, Yujun Choi, Hyang-Tag Lim, Kanghee Hong, more

2017 Conference on Lasers and Electro-Optics (CLEO) > 1 - 2

2017 Conference on Lasers and Electro-Optics (CLEO)

We show that non-zero discord state can be generated via classical second-order interference. Considering the fundamental importance of interference, this result provides a new insight to understand the physical interpretation of quantum discord.

article

Robustness of reference-frame-independent quantum key distribution against the relative motion of the reference frames

Tanumoy Pramanik, Byung Kwon Park, Young-Wook Cho, Sang-Wook Han, more

Physics Letters A > 2017 > 381 > 31 > 2497-2501

Reference-Frame-Independent quantum key distribution (RFI-QKD) is known to be robust against slowly varying reference frames. However, other QKD protocols such as BB84 can also provide secrete keys if the speed of the relative motion of the reference frames is slow enough. While there has been a few studies to quantify the speed of the relative motion of the reference frames in RFI-QKD, it is not...

article

Morphology effect of β-zeolite supports for Ni2P catalysts on the hydrocracking of polycyclic aromatic hydrocarbons to benzene, toluene, and xylene

Yong-Su Kim, Kye-Sung Cho, Yong-Kul Lee

Journal of Catalysis > 2017 > 351 > C > 67-78

Ni₂P catalysts supported on nano-sized β (β-N) or micrometer-sized β (β-M) zeolites were prepared by temperature-programmed reduction, and their structural and chemical properties were analyzed by N₂ physisorption, transmission electron microscopy, X-ray diffraction, extended X-ray absorption fine structure, NH₃ temperature-programmed desorption, and CO uptake. The catalytic activity was tested at...

article

QKD system with fast active optical path length compensation

Byung Kwon Park, Min Soo Lee, Min Ki Woo, Yong-Su Kim, more

Science China Physics, Mechanics & Astronomy > 2017 > 60 > 6 > 1-7

We develop a quantum key distribution (QKD) system with fast active optical path length compensation. A rapid and reliable active optical path length compensation scheme is proposed and applied to a plug-and-play QKD system. The system monitors changes in key rates and controls it is own operation automatically. The system achieves its optimal performance within three seconds of operation, which includes...

article

Vapor phase deoxygenation of heptanoic acid over silica-supported palladium and palladium-tin catalysts

Nicholas Kaylor, Jiahan Xie, Yong-Su Kim, Hien N. Pham, more

Journal of Catalysis > 2016 > 344 > C > 202-212

Silica-supported Pd and PdSn catalysts were prepared by ion exchange or incipient wetness impregnation and characterized with H₂ chemisorption, X-ray diffraction, in situ Sn K-edge X-ray absorption near edge structure (XANES), and scanning transmission electron microscopy. The activity of the catalysts was evaluated in the deoxygenation of vapor-phase heptanoic acid at 0.1MPa and 573K. A Pd catalyst...

article

Damage-free and atomically precise surface preparation of SrTiO3

Yong Su Kim, Dong Jin Yun, Seong Heon Kim, Yong Koo Kyoung, more

Current Applied Physics > 2016 > 16 > 11 > 1464-1467

Atomically flat and clean (i.e., defect- and contaminant-free) oxide surfaces are essential to fabricating new interfaces with emerging properties and analyzing the surface electronic structure. We investigated how to apply Ar-sputtering techniques to surface preparation. Defect-related peaks were not observed in the spectra collected from the SrTiO₃(001) surface prepared via time and energy controlled...

article

Defect states in amorphous SiNx:H compounds using thermally stimulated exo-electron emission

Sung Heo, Hyoungsun Park, JaeGwan chung, Hyung Ik Lee, more

Thin Solid Films > 2016 > 616 > C > 850-855

Defect states of hydrogenated amorphous silicon nitride (a-SiNx:H) thin films were measured using the thermally stimulated exoelectron emission spectroscopic method. The defect states of films with nitrogen to silicon composition ratios (x) of 0.92, 1.21, and 1.44 were found to be located 1.66, 1.77, and 1.82eV below the conduction band minimum, respectively.We confirmed that the hydrogen concentration...

article

Development of a model for risk and cost analysis in overseas plant construction projects focusing on petrochemical plant construction projects

Yong-Su Kim, Hyun-Wook Kang

KSCE Journal of Civil Engineering > 2017 > 21 > 5 > 1549-1562

The importance of preliminary analysis of risk and cost for overseas plant construction projects is more and more emphasized due to intensive cost bidding competition. The vigorous competition between contractors causes a financial loss due to the low price bidding and risks factors of the project. Accordingly, the main purpose of this study is to present an analysis model that relates the risk and...

chapter

Study on the Characteristics of Noise Reduction Effects of a Sound Reduction Structure

Mitsuru Endo, Yong Su Kim

Springer Proceedings in Physics > Vibration Problems ICOVP 2011 > Vibration Problems in Structural Dynamics, Damage Mechanics and Composite Materials > 59-65

The concept of a sound reduction structure is proposed as a new method for reducing noises generated by vibrating solids. The proposed concept involves directly attaching hard sound absorbing materials to the vibrating surfaces of noise sources so as to provide a back air space. The effectiveness of the proposed concept is verified theoretically and experimentally using a one-dimensional acoustic...

article

Analysis of the probabilistic cost variation ranges according to the effect of core quantitative risk factors for an overseas plant project: Focused on a Middle East gas plant project

Hyun-Wook Kang, Yong-Su Kim

KSCE Journal of Civil Engineering > 2016 > 20 > 2 > 509-518

The purpose of this study targets overseas gas plant construction projects with the aim of analyzing the probabilistic cost variation range with consideration of the effect of core quantitative risk factors. C-Project, which is expected to be completed by a domestic construction company in country U, was thus selected as the subject of analysis. By interviewing experts through survey questions, the...

chapter

Protecting quantum discord using weak measurement and quantum measurement reversal

Jiwon Yune, Kang-Hee Hong, Hyang-Tag Lim, Jong-Chan Lee, more

2015 11th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR) > 3 > 1 - 2

2015 11th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

We report that quantum discord can be protected from decoherence by making use of weak and reversing quantum measurements, making it possible to distribute quantum correlation between two remote parties in noisy environment.

chapter

Generation of time-bin entangled photon pairs utilizing coherence revival property of a CW multi-mode laser

Osung Kwon, Kwang-kyoon Park, Young-Sik Ra, Yong-Su Kim, more

2015 11th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR) > 3 > 1 - 2

2015 11th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

We report another regime for generation of time-bin entangled photon pairs and demonstrate the scheme experimentally. In our scheme, the photon pairs are pumped by a cw multi-mode laser having coherence revival property.

chapter

Two-photon interference between distinguishable pathways utilizing SPDC pumped by a multimode diode laser

Osung Kwon, Yujun Choi, Yong-Su Kim, Sang Wook Han, more

2015 11th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR) > 3 > 1 - 2

2015 11th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

We report the two-photon interference between distinguishable pathways before arriving at two detectors utilizing SPDC pumped by a multimode diode laser with the distinctive coherence property.

article

Performance indices for quantitative measurement of R&D results in private construction companies

Hyun-Bae Kim, Yong-Su Kim

KSCE Journal of Civil Engineering > 2015 > 19 > 4 > 814-830

As the investment in Research and Development (R&D) projects is increasing in private construction companies in Korea, the necessity to evaluate the effects of the investment in terms of company’s finance is growing. However, there has not been an applicable system to properly and quantitatively measure the result and effectiveness of R&D efforts in Korea. In order to evaluate R&D results,...

article

Observation of ferroelectricity induced by defect dipoles in the strain-free epitaxial CaTiO3 thin film

Sang Mo Yang, Soon Jae Moon, Tae Heon Kim, Yong Su Kim

Current Applied Physics > 2014 > 14 > 5 > 757-760

CaTiO ₃ is a well-known incipient ferroelectric material that does not undergo a ferroelectric phase transition in spite of the intriguing dielectric constant behavior. Especially, unlike a prototypical incipient ferroelectric SrTiO ₃ , the paraelectric state of CaTiO ₃ cannot be easily destroyed by small perturbations, including cation doping and epitaxial strain. We present...

article

Novel Ni2P/zeolite catalysts for naphthalene hydrocracking to BTX

Yong-Su Kim, Gwang-Nam Yun, Yong-Kul Lee

Catalysis Communications > 2014 > 45 > Complete > 133-138

Ni ₂ P catalysts supported on ZSM-5, Beta, and USY zeolites were prepared by temperature-programmed reduction (TPR), applied for the hydrocracking of naphthalene, and characterized by BET, CO uptake, NH ₃ -TPD, TEM, X-ray diffraction (XRD), and extended X-ray absorption fine structure (EXAFS). The catalytic activity was tested at 673K and 3.0MPa in a three-phase fixed bed reactor for...

article

Fusion Licensing and Safety Studies in Korea

Hyuck Jong Kim, Hyung Chan Kim, Myeun Kwon, Gyunyoung Heo, more

IEEE Transactions on Plasma Science > 2014 > 42 > 6-1 > 664 - 670

Korean activities on fusion licensing and safety studies have been going through three phases. The first phase started with the licensing of the Korean Superconductor Tokamak Advanced Research (KSTAR) classified as a radiation-generating device on the basis of the existing nuclear regulations. To accommodate the specific characteristics of a tokamak device that is to use deuterium in fusion plasma...

article

Analysis of probabilistic maintenance cost variation ranges through surveys of maintenance cycles/maintenance cost ratios for wastewater treatment plants

Yong-Su Kim, Hyun-Wook Kang

KSCE Journal of Civil Engineering > 2014 > 18 > 1 > 19-26

The purpose of this study is to analysis of probabilistic maintenance cost Variation ranges through surveys of maintenance cycles/maintenance cost ratios for wastewater treatment plants To achieve this purpose, seven plants of similar capacity were selected and surveys on its maintenance cost were conducted with its operation managers. The maintenance cycles and cost ratios were carried out through...

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INFONA - science communication portal

Search results for: Yong-Su Kim

Practical Sensitivity Bound for Multiple Phase Estimation with Multi‐Mode $N 00 N$ States

A Model for Risk Cost and Bidding Price Prediction based on Risk Information in Plant Construction Projects

Non-zero discord bipartite state generation via classical second-order interference

Robustness of reference-frame-independent quantum key distribution against the relative motion of the reference frames

Morphology effect of β-zeolite supports for Ni2P catalysts on the hydrocracking of polycyclic aromatic hydrocarbons to benzene, toluene, and xylene

QKD system with fast active optical path length compensation

Vapor phase deoxygenation of heptanoic acid over silica-supported palladium and palladium-tin catalysts

Damage-free and atomically precise surface preparation of SrTiO3

Defect states in amorphous SiNx:H compounds using thermally stimulated exo-electron emission

Development of a model for risk and cost analysis in overseas plant construction projects focusing on petrochemical plant construction projects

Study on the Characteristics of Noise Reduction Effects of a Sound Reduction Structure

Analysis of the probabilistic cost variation ranges according to the effect of core quantitative risk factors for an overseas plant project: Focused on a Middle East gas plant project

Protecting quantum discord using weak measurement and quantum measurement reversal

Generation of time-bin entangled photon pairs utilizing coherence revival property of a CW multi-mode laser

Two-photon interference between distinguishable pathways utilizing SPDC pumped by a multimode diode laser

Performance indices for quantitative measurement of R&D results in private construction companies

Observation of ferroelectricity induced by defect dipoles in the strain-free epitaxial CaTiO3 thin film

Novel Ni2P/zeolite catalysts for naphthalene hydrocracking to BTX

Fusion Licensing and Safety Studies in Korea

Analysis of probabilistic maintenance cost variation ranges through surveys of maintenance cycles/maintenance cost ratios for wastewater treatment plants

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