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Hong, Suk,Li , Yan,Eom , Joo Beom,Choi , Yongdoo AME Publishing Company 2018 Quantitative imaging in medicine and surgery Vol.8 No.8
<P>Conclusions: This nanogel system may have potential utility for selective NIR fluorescence imaging and combined chemo/radio therapy of proliferating macrophage cells in atherosclerotic regions, allowing for reduction of systemic toxicity.</P>
Hongsuk Yi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.4
We have studied the electronic structure of a P-rich \inp surface by using \emph{ab-initio} pseudopotential calculations. The T₄-site P trimer surface, which is characterized by one P trimer and one exposed Ga atom in the second layer per unit cell, obeys the electron counting rule and is semiconducting. This structure differs from that observed in a recent experimental work by Li etal. The stability of this reconstruction is attributed to the charge transfer from the rest In atom to the P trimer. Such a change in the electronic structure induced by complete charge transfer explains the bias voltage-dependent scanning tunneling microscopy images well. We have studied the electronic structure of a P-rich \inp surface by using \emph{ab-initio} pseudopotential calculations. The T₄-site P trimer surface, which is characterized by one P trimer and one exposed Ga atom in the second layer per unit cell, obeys the electron counting rule and is semiconducting. This structure differs from that observed in a recent experimental work by Li etal. The stability of this reconstruction is attributed to the charge transfer from the rest In atom to the P trimer. Such a change in the electronic structure induced by complete charge transfer explains the bias voltage-dependent scanning tunneling microscopy images well.
Assessment and Prediction of Project Schedule Risk Based on Schedule Constraints
Hongsuk Sung,Chulsoon Park 한국산업경영시스템학회 2013 한국산업경영시스템학회 학술대회 Vol.2013 No.추계
The project-based business companies usually have much interest in predicting the expected finish date and related probability of project completion to refer at their proposals for projects. In general, the management of projects schedule risk is achieved by modeling project schedule with PERT/CPM techniques, then performing risk assessment with Monte-Carlo simulation method. However, since these approaches cannot reflect various schedule constraints, the project managers cannot prepare for the project risks in advance of their. This paper proposed a methodology for predicting project schedule risk by identifying and enforcing the constraints which may occur in a storage tank engineering and construction project environment. We applied our approach to a storage tank construction project to validate its feasibility. By using the methodology proposed in this paper, the project schedule risk can be evaluated and predicted more accurately and practically than the PERT/CPM or Monte-Carlo simulation approach.
Electronic Structure and Half-Metallic Ferromagnetism in CdGe1??xMnxP2 Chalcopyrite Semiconductor
Hongsuk Yi,Hyoungwoo Park 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
We present an ab initio pseudopotential density-functional calculation for the electronic and magnetic structures of Mn-containing CdGeP2 chalcopyrite semiconductor in its ordered magnetic phase. The calculated density of states of the CdGe1ကxMnxP2 with a realistic x = 0:125 show the formation of a ferromagnetic band, primarily due to hybridization of Mn-3d and nearest-neighbor P- 3p orbitals. This band structure renders the material half-metallic and supports the carrier-induced ferromagnetism. We discuss theoretically how ferromagnetism results from the doping through Mn substitution for Ge.
Quantitative analysis of vehicle particle emission by using calibrated CPC system
Hongsuk Kim,이진욱 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.11
Particle size distribution and particle number concentration from diesel engines are subjects of significant environmental concerns especially in the EU. A few years ago, the UN-ECE PMP proposed a method for measuring particle emissions in the diluted exhaust of internal combustion engine vehicles, which has become a key method used in new dilution systems and sampling condition. This paper describes the effects of parameters such as condensation particle counter (CPC) according to test procedures, test fuel and vehicle test mode, including NEDC and CVS-75 mode. The main results obtained from this study can be summarized as follows: (1) Periodic calibration of the CPC system is essential because the long-term usage of a CPC leads to an underestimation in the measurements of small particles. (2) Particle emissions measured by the UN-ECE PMP method were found to exhibit comparable repeatability as compared to other regulated emissions. (3) In particle number concentration emitted from different-fueled vehicles, the sources of particle emissions in an ascending order of magnitude are as follows: DPF equipped diesel passenger vehicles, gasoline and LPG fueled vehicles, and DPF unequipped diesel passenger vehicles. Also, we found that the particle numbers of DPF equipped diesel passenger vehicles, gasoline and LPG-fueled vehicles can meet the EU regulation limit (<6.0×10^11#/km), while DPF unequipped diesel passenger vehicles do not meet the EU limit.
( Hongsuk Choi ),( Subin Kim ),( Hayong Song ),( Seokho Suh ),( Hyeong-jin Kim ),( Kwangsup Eom ) 한국부식방식학회 2021 Corrosion Science and Technology Vol.20 No.5
In this work, we proposed a facile method to fabricate the three-dimensional porous copper current collector (3D Cu CC) for a Si-dominant anode in a Li-ion battery (LiB). The 3D Cu CC was prepared by combining chemical etching and thermal reduction from a planar copper foil. It had a porous layer employing micro-sized Cu balls with a large surface area. In particular, it had strengthened attachment of Si-dominant active material on the CC compared to a planar 2D copper foil. Moreover, the increased contact area between a Si-dominant active material and the 3D Cu could minimize contact loss of active materials from a CC. As a result of a battery test, Si-dominant active materials on 3D Cu showed higher cyclic performance and rate-capability than those on a conventional planar copper foil. Specifically, the Si electrode employing 3D Cu exhibited an areal capacity of 0.9 mAh cm<sup>-2</sup> at the 300<sup>th</sup> cycles (@ 1.0 mA cm<sup>-2</sup>), which was 5.6 times higher than that on the 2D copper foil (0.16 mAh cm<sup>-2</sup>).
Hongsuk Choi,Sungho Lee,Man-Joong Jeon,Young-Sun Min 대한직업환경의학회 2020 대한직업환경의학회지 Vol.32 No.-
Background: Studies have investigated the relationship between long work hours and sleep disorders; however, they have focused on shift workers or specific workers who are at high risk of industrial accidents rather than wage workers in general. The purpose of this study is to investigate the effects of long work hours on sleep disorders among non-shift daytime wage workers. Methods: We conducted a secondary analysis of data from the 5th Korean Working Conditions Survey. From the 50,205 total participants, we included 26,522 non-shift daytime wage workers after excluding self-employed people, business owners, unpaid family employees, and wage workers who work nights and shifts. Sleep disorders were categorized into “difficulty in falling asleep,” “frequent waking,” and “waking up with fatigue.” Logistic regression analysis was used to evaluate the influence of long work hours on sleep disorders, and the odds ratios (ORs) were calculated. Results: The OR of working > 52 hours per week was 1.183 (95% confidence interval [CI]: 1.002-1.394) for the risk of developing insomnia compared with working ≤ 40 hours per week. The OR of waking up with fatigue was 1.531 (95% CI: 1.302-1.801). Long work hours showed no significant relationship with difficulty in falling asleep or with frequent waking. Conclusions: Working for extended hours was associated with increased fatigue upon waking in non-shift daytime wage workers.