석회화 치성 낭종 1례

이상학,염범우,이승훈,한승훈,김응식,김광일 한국의학사 1998 診斷과治療 Vol.18 No.10

Impurity-Mediated Early Condensation of a Charge Density Wave in an Atomic Wire Array

Yeom, Han Woong,Oh, Deok Mahn,Wippermann, Stefan,Schmidt, Wolf Gero American Chemical Society 2016 ACS NANO Vol.10 No.1

<P>We directly show how impurity atoms induce the condensation of a representative electronic phase, the charge density wave (CDW) phase, in atomic scale with scanning tunneling microscopy. Oxygen impurity atoms on the self-assembled metallic atomic wire array on a silicon crystal condense the CDW locally above the pristine transition temperature. More interestingly, the CDW along the wires is induced not by a single atomic impurity but by the cooperation of multiple impurities. First principles calculations disclose the mechanism of the cooperation as the coherent superposition of the local lattice strain induced by impurities, stressing the coupled electronic and lattice degrees of freedom for the CDW. This opens the possibility of the strain engineering over electronic phases of atomic-scale systems.</P>

Topological fate of edge states of single Bi bilayer on Bi(111)

Yeom, Han Woong,Jin, Kyung-Hwan,Jhi, Seung-Hoon American Physical Society 2016 Physical Review B Vol.93 No.7

<P>We address the topological nature of electronic states of step edges of Bi(111) films by first-principles band structure calculations. We confirm that the dispersion of step-edge states reflects the topological nature of underlying films, which become topologically trivial at a thickness larger than eight bilayers. This result clearly conflicts with recent claims that the step-edge state at the surface of a bulk Bi(111) crystal or a sufficiently thick Bi(111) film represents nontrivial edge states of the two-dimensional topological insulator phase expected for a very thin Bi(111) film. The trivial step-edge states have a gigantic spin splitting of one-dimensional Rashba bands and substantial intermixing with electronic states of the bulk, which might be exploited further.</P>

Transforming a surface state of a topological insulator by a Bi capping layer

Yeom, Han Woong,Kim, Sung Hwan,Shin, Woo Jong,Jin, Kyung-Hwan,Park, Joonbum,Kim, Tae-Hwan,Kim, Jun Sung,Ishikawa, Hirotaka,Sakamoto, Kazuyuki,Jhi, Seung-Hoon American Physical Society 2014 Physical review. B, Condensed matter and materials Vol.90 No.23

Effect of Bovine Plasma Protein Hydrolysates on the Quality Properties of Cooked Pork Patty

Hyun-Woo Seo,Jin-Kyu Seo,Hyeon-Woong Yeom,Han-Sul Yang 경상대학교 농업생명과학연구원 2016 농업생명과학연구 Vol.50 No.1

The study investigated the effects of adding bovine plasma protein(PP) hydrolysates on the quality properties of cooked pork patties. Pork patties were prepared as follows: manufactured with pork back-fat(control); replacement of back-fat with 40% olive oil(T1), 40% olive oil and 2% PP hydrolysates(T2), and 40% olive oil and 4% PP hydrolysates(T3). The olive oil modified the fatty acid profiles of the pork patties by lowering the saturated fatty acids(SFAs) percentage. Olive oil and 4% PP hydrolysates addition reduced the level of 2-thiobarbituric acid-reactive substance(TBARS) values in pork patties, compared to the controls. Furthermore, the pork patties with added PP hydrolysates had higher pH values than the control. All samples containing olive oil and PP hydrolysates had increased levels of DPPH radical scavenging activity. In particular, added PP hydrolysates were more effective in increasing antioxidant activity than were the other treatments. Therefore, PP hydrolysates could be used as a natural antioxidative in cooked pork patties.

Cashing in on the Cache in the Cloud

Han, H.,Young Choon Lee,Woong Shin,Hyungsoo Jung,Yeom, H. Y.,Zomaya, A. Y. IEEE 2012 IEEE transactions on parallel and distributed syst Vol.23 No.8

<P>Over the past decades, caching has become the key technology used for bridging the performance gap across memory hierarchies via temporal or spatial localities; in particular, the effect is prominent in disk storage systems. Applications that involve heavy I/O activities, which are common in the cloud, probably benefit the most from caching. The use of local volatile memory as cache might be a natural alternative, but many well-known restrictions, such as capacity and the utilization of host machines, hinder its effective use. In addition to technical challenges, providing cache services in clouds encounters a major practical issue (quality of service or service level agreement issue) of pricing. Currently, (public) cloud users are limited to a small set of uniform and coarse-grained service offerings, such as High-Memory and High-CPU in Amazon EC2. In this paper, we present the cache as a service (CaaS) model as an optional service to typical infrastructure service offerings. Specifically, the cloud provider sets aside a large pool of memory that can be dynamically partitioned and allocated to standard infrastructure services as disk cache. We first investigate the feasibility of providing CaaS with the proof-of-concept elastic cache system (using dedicated remote memory servers) built and validated on the actual system, and practical benefits of CaaS for both users and providers (i.e., performance and profit, respectively) are thoroughly studied with a novel pricing scheme. Our CaaS model helps to leverage the cloud economy greatly in that 1) the extra user cost for I/O performance gain is minimal if ever exists, and 2) the provider's profit increases due to improvements in server consolidation resulting from that performance gain. Through extensive experiments with eight resource allocation strategies, we demonstrate that our CaaS model can be a promising cost-efficient solution for both users and providers.</P>

유산소 운동과 서킷트 웨이트 트레이닝이 비만 여고생의 신체조성 및 혈청지질에 미치는 영향

한재웅,차성웅,염종우,남태호,김태운,백영호 한국운동영양학회 2000 Physical Activity and Nutrition (Phys Act Nutr) Vol.4 No.2

In this study, to find out the effects of aerobics exercise training and CWT on body compositin and serum lipid in obese highschool girls, for 12 weeks, aerobics exercise training group exercised by 60∼85% HRmax of intensity, 4times/week, 60min/days, while CWT group exercised by 40∼55% HRmax of intensity, 3times/week, 50min/days. Finally we have got the following results : 1. For the variations of weight among groups, aerobics exercise training group and obese CWT group showed more decrease than nonobese CWT group by statistically significant difference(p≤.01). For intra-group paired t-test, before and after experiment, all groups showed decrease. In addition, there were significant differences for nonobese aerobics exercise training group(p≤.001), obese aerobics exercise training group(p≤.01) and obese CWT group(p≤.01). 2. For the variations of BMI among groups, obese CWT group showed more decrease than nonobese CWT group by statistically significant difference(p≤.05). For intra-group paired t-test, before and after experiment, all groups showed decrease. In addition, there were significant differences for nonobese aerobics exercise training group(p≤.001), obese aerobics exercise training group(p≤.01) and obese CWT group(p≤.01). 3. For the variations of % fat among groups, obese aerobics exercise training group showed more decrease than nonobese CWT group by significant difference(p≤.05). For intra-group paired t-test, before and after experiment, all groups showed decrease with significant differences(p≤.01). 4. For the variations of LBM among groups, there were no significant differences. while for intra-group paired t-test, before and after experiment, all groups showed increasement. Only obese aerobics exercise training group showed significant differences(p≤.05). 5. For the variations of TC among groups, aerobics exercise training group show more decrease than that of CWT group by significant difference(p≤.001). For intra-group paired t-test, before and after experiment, aerobics exercise training group showed decrease while CWT group showed increment. In addition, there were significant differences for nonobese aerobics exercise training group(p≤.001), obese aerobics exercise training group(p≤01) and nonobese/obese CWT group(p≤.01). 6. For the variations of TG for intra-group paired t-test, before and after experiment, significant difference exist for aerobics exercise training group and nonobese CWT group(p≤.01). 7. For the variations of HDL-C for intra-group paired t-test, obese aerobics exercise training group(p≤.01), nonobese CWT group(p≤.01) and obese CWT group(p≤.001) showed significant differences. 8. For the variations of LDL-C among groups, CWT group showed more increased than aerobics exercise training group by significant difference(p≤.001). For intra-group paired t-test, before and after experiment, aerobics exercise training group showed decrease while CWT group increased. In addition, there were significant differences for nonobese aerobics exercise training group(p≤.001) and nonobese/obese CWT group(p≤.05). 9. For the variations of PLT among groups, obese aerobics exercise training group showed more increment than obese CWT group by significant difference(p≤.01). For intra-group paired t-test, before and after experiment, aerobics exercise training group and nonobese CWT group showed increment while obese CWT group showed decrease. In addition, there were significant differences for nonobese aerobics exercise training group(p≤.01) and obese aerobics exercise training group(p≤05). 10. For the variations of AI among groups, obese aerobics exercise training group showed more decrease than obese CWT group by significant difference(p≤.05). For intra-group paired t-test, before and after experiment, all groups showed decrease. In addition, there were significant differences for nonobese aerobics exercise training group(p≤.001), obese aerobics exercise training group(p≤.05) and obese CWT group(p≤.01). According to the results of this study, for all groups, the decrease of weight, BMI, %fat, TG and AI, the increment of LBM, HDL-C, PLT means that both aerobics exercise training and CWT can be helpful for improving health. Still much to be desired to clarify the contrary result on TC and LDL-C of aerobics exercise training group and CWT group.

전이중 통신방식을 이용한 분산 네트워크 환경에서의 랜덤 액세스 성능 분석

염동우(Dongwoo Yeom),한성민(Sungmin Han),최지웅(Ji-Woong Choi) 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.1

Observation of a metallic ground state ofSn/Ge(111)−3×3at 4 K

Morikawa, Harumo,Jeong, Sukmin,Yeom, Han Woong American Physical Society 2008 Physical review. B, Condensed matter and materials Vol.78 No.24

Giant kink in electron dispersion of strongly coupled lead nanowires.

Kim, Keun Su,Yeom, Han Woong American Chemical Society 2009 NANO LETTERS Vol.9 No.5

<P>Our photoelectron spectroscopy study shows a giant kink in the electron dispersion, a sign of high-energy manybody interactions of electrons, in a well-ordered Pb nanowire array self-assembled on a silicon substrate. We show that the unique electronic band structure due to the strong lateral coupling and the atomic structure of the nanowires drives an enhanced manybody interaction for kinked electron dispersion. The major giant kink mechanisms discussed previously, the magnetic and plasmonic excitations, are not relevant in the present system, supporting the recent kink theory based purely on electron-electron correlation. This suggests that tailored electronic band structures in nano array systems can provide unprecedented ways to study manybody interactions of electrons.</P>