Spectroscopic fingerprints of valence and spin states in manganese oxides and fluorides

Ruimin Qiao,Timothy Chin,Stephen J. Harris,Shishen Yan,Wanli Yang 한국물리학회 2013 Current Applied Physics Vol.13 No.3

We performed a systematic study of soft X-ray absorption spectroscopy in various manganese oxides and fluorides. Both Mn L-edges and ligand (O and F) K-edges are presented and compared with each other. Despite the distinct crystal structure and covalent/ionic nature in different systems, the Mn-L spectra fingerprint the Mn valence and spin states through spectral lineshape and energy position consistently and evidently. The clear O- and F-K pre-edge features in our high resolution spectra enable a quantitative definition of the molecular orbital diagram with different Mn valence. In addition, while the binding energy difference of the O-1s core electrons leads to a small shift of the O-K leading edges between trivalent and quadrivalent manganese oxides, a significant edge shift, with an order of magnitude larger in energy, was found between divalent and trivalent compounds, which is attributed to the spin exchange stabilization of half-filled 3d system. This shift is much enhanced in the ionic fluoride system. This work provides the spectroscopic foundation for further studies of complicated Mn compounds.

Toughness and Strength Coordination in a Low-Alloy Zn–0.5 Mg Alloy via Extrusion and Post-Deformation Annealing

Ruimin Li,Yutian Ding,Hongfei Zhang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10

Zn is considered one of the most attractive bioresorbable candidates for metal implants, because it does not exhibit the inherent limitations of Fe and Mg. To explore the coordination of the toughness and strength of Zn alloys via grain size, secondary phase, and texture modification, we designed a micro-alloyed binary Zn–0.5 Mg (wt%) alloy. The sample was processed through hot extrusion at 220 °C with an extrusion ratio of 25:1 and subjected to rapid heat treatment at varying temperatures. Interestingly, the ductility of the low-temperature annealed alloys increased without exhibiting strength loss, in contrast to the known behavior of most other metallic alloys. The mechanical properties were optimized in the sample by thermal deformation and 30 min annealing at 150 °C, exhibiting the following results: yield strength of 240.3 ± 4.3 MPa, ultimate tensile strength of 293.6 ± 3.8 MPa, and elongation to failure of 36.3 ± 4.5%. During the low-temperature annealing of extruded Zn–0.5 Mg rods, the fine Mg2Zn11 phase particles pinning effect and the recrystallization behavior inhibited grain coarsening. The prismatic <a> and pyramidal <c + a> slip systems were activated by a non-basal texture, which contributed to the enhanced toughness. The balance between strength and ductility was mainly attributed to a synergistic effect of grain refinement, unique texture modification, and secondary phases.

An Empirical Study on User Acceptance of Mobile Payment in China

Ruimin Zhang(장예민),Taesoo Moon(문태수) 한국인터넷전자상거래학회 2013 인터넷전자상거래연구 Vol.13 No.2

최근 스마트폰의 이용자가 증가하면서 모바일 결제서비스의 이용의도에 관한 관심이 높아지고 있다. 특히 모바일 결제서비스는 모바일 기기의 기능성과 실용성을 높여주는 중요한 수단이 되기도 한다. 중국의 경우에는 선진국과 비교할 때, 아직 모바일 결제서비스가 초기단계에 머물러 있다. 그 이유는 아직 모바일 결제에 대한 위험이 높은 것으로 사용자가 인식하고 있기 때문이다. 본 연구는 중국의 모바일 사용자를 대상으로 UTAUT(Unified Theory of Acceptance and Use of Technology) 모델을 기반으로 하여 성과기대(performance expectancy), 노력기대(effort expectance), 사회적 영향(social influence), 그리고 인지된 위험(perceived risk) 등의 연구변수를 채택하여 모바일 결제서비스의 이용의도에 관한 실증연구를 수행하고자 한다. 또한 UTAUT 모델에 제안하는 성(gender), 나이(age), 경험(experience), 자발성(voluntariness) 등의 조절변수를 도입하여 영향요인과 이용의도간의 조절효과에 대해서도 분석하였다. 그 결과, UTAUT 영향요인 변수와 이용의도간의 유의한 영향관계를 실증적으로 분석하였으며, 조절효과가 존재한다는 것을 분석할 수 있었다. 본 연구의 기여도는 중국 모바일 사용자들이 결제서비스 이용의도에 있어 UTAUT 모델에서 제시한 연구결과와 차이가 있고, 정보기술의 사용자 수용에 있어 개인특성의 고려가 중요하다는 시사점을 제공하고 있다.

엘리트 선수들의 경기력과 3대 영양소

이서민 ( Ruimin Li ),오정헌 ( Oh Jeongheon ),유주인 ( Yu Jooin ),한누리 ( Han Nuri ),서태범 ( Seo Teabeom ) 제주대학교 해양스포츠센터 2021 해양스포츠연구 Vol.11 No.2

본 연구는 스포츠 영양학이 엘리트 선수들의 경기력 향상에 미치는 영향을 분석한 선행연구를 조사하여 그 효과를 확인하는 데 목적이 있다. 다량영양소의 섭취는 건강뿐 아니라 운동수행능력에 직접적인 영향을 미치는 중요한 에너지원으로 알려져 있으며, 근조직의 구조적 기반을 형성하고 호르몬 합성 등에 필수적인 역할을 한다. 따라서 본 연구는 3대 영양소(탄수화물, 단백질, 지방)의 섭취 용량과 시기에 따른 차이를 연구한 4∼5개의 문헌을 선별하여 조사하였으며, 채택한 문헌을 기반으로 내용을 정리한 결과는 다음과 같다. 탄수화물은 유산소성 운동 중 구강 헹굼 시 기록 단축에 효과적이었으며, 단백질은 저항성 운동 전에 섭취 시 근력과 골격근량 상승에 대체로 유의하였다. 탄수화물을 줄이고 지방 섭취를 늘리는 저탄수화물·고지방 식단의 경우 체중 감소에는 유의하나 운동수행능력에 부정적 영향을 줄 수 있다. 따라서 선수들의 경기력을 향상하기 위해서는 영양소별로 섭취 시기, 용량 및 방법 등을 고려하여 섭취하는 것이 중요하다. 본 연구의 결과는 선수나 운동인의 경기력을 보다 효과적으로 향상하기 위한 영양 섭취 방법에 도움이 될 것이다. The purpose of this study is to investigate the effect of sports nutrition on the improvement of the performance of elite athletes by examining the previous studies. Intake of macro-nutrients is known as an essential energy source that directly affects not only health but also exercise performance, and forms the structural basis of muscle tissue, and plays an essential role in hormone synthesis. Therefore, in this study, 4∼5 literature that studied the differences in intake capacity and time of the three major nutrients (carbohydrates, proteins, fats) were selected and investigated. Based on the selected literature, the results are summarized as follows. Carbohydrates(oral rinse) were effective in shortening the record during aerobic exercise, and when protein was consumed before resistance exercise, muscle strength and skeletal muscle mass increase were generally significant. A low-carb high-fat diet, which reduces carbohydrates and increases fat intake, is significant for weight loss, but may negatively affect performance. Therefore, to improve the performance of athletes, it is important to take into consideration the timing, dosage, and type of intake for each nutrient. These findings in this study may provide scientific evidence for effective sports nutritional intake for enhancing sports performance for athletes.

A Review of the Techniques, Current Status and Learning Curves of Laparoscopic Bile Duct Exploration

Poh Benjamin Ruimin,Tan Siong San,Lee Lip Seng,Chiow Adrian Kah Heng Korean Society of Gastrointestinal Cancer 2017 Journal of digestive cancer reports Vol.5 No.1

Laparoscopic cholecystectomy is of one the most common general surgical operations performed today. Concomitant choledocholithiasis occurs in roughly 10-20% of patients with symptomatic gallstones. Laparoscopic bile duct exploration (LBDE) offers a single-stage minimally-invasive solution to the management of choledocholithiasis. LBDE may be performed either via the transcystic route or via laparoscopic choledochotomy. A number of strategies to improve success are available to the surgeon to help in the problem of complicated choledocholithiasis, these range from simple maneuvers to the use of laser or mechanical lithotriptors. With the advances in laparoscopic surgery, it is also possible to handle complex surgical conditions such as Mirizzi syndrome or recurrent pyogenic cholangitis laparoscopically, even though these have yet to be accepted as standard of care. Following laparoscopic choledochotomy, options for closure include: primary closure, closure over a T-tube, and closure over an endobiliary stent. T-tube placement has been associated with increased operating time and hospital length of stay compared to primary closure, with no significant differences in morbidity. Based on the available literature, LBDE appears comparable to ERCP with regards to procedural efficacy and morbidity. LBDE remains relevant to the general surgeon and is best viewed as being complementary to endoscopic therapy in the management of choledocholithiasis.

Super-Resolution for Surveillance Facial Images via Shape Prior and Residue Compensation

Tao Lu,Ruimin Hu,Junjun Jiang,Yanduo Zhang,Wei He 보안공학연구지원센터 2013 International Journal of Multimedia and Ubiquitous Vol.8 No.6

3D wet-spinning printing of wearable flexible electronic sensors of polypyrrole@polyvinyl formate

Jun Qian,Ruimin Xiao,Fan Su,Mengna Guo,Dagang Liu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-

Polymer based 3D printings are generally generated from the melt fluids or gels instead of polymer solution. Inspired by continuous wet-spinning of polymer fiber, we explored a new polyvinyl formate (PVFm)printing ink which was directly coagulated by water and mold into designed 3D elastic architectureslayer-by-layer. The degree of esterification (DE), chemical structure, morphology, and mechanical propertiesof PVFm were all investigated. Furthermore, 3D PVFm was coated by polypyrrole (PPy) via in-situpolymerization to fabricate wearable flexible electronic sensors. The relative resistance changes and sensitivityof PPy@PVFm on monitoring physical strain and pressure were characterized. Results show thatPPy@PVFm could stably and sensitively recognize human body activities through relative changes inresistance in a wide range of linear relationship. Therefore, a new protocol is readily to realize a strategyof 3D wet-spinning printing and wearable flexible electronic sensors.

Influence of Real-Information to Change Tourists' Travel Route

Qingyun Chen,Ruimin Ma,Maozhu Jin,Peiyu Ren 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.11

The tourism system as a whole is becoming less sustainable, both because of its overall rapid growth and the unwillingness to change travel behavior (tourists). In the field of the tourism, the tourists' activities have influences on the protection and development of the natural scenic. In order to understand the tourist' intention to change travel route based on real-time information, this paper adds trust to the model of theory of planned behavior (TPB). Exploratory and confirmatory factor analysis are used to identify and confirm the constructs. In addition, structural equation modeling was established to test the measure model. Results indicate that the attitude, subjective norm and perceived behavioral control have positive effect on the behavioral intention of changing travel route according to real-time information. Moreover, trust also has positive influence on behavioral intention via three antecedents of intention. The findings have implications for predicting the tourist's intention of travel route change.

Taxation-based Neighbor Selection for Layered Peer-to-Peer Streaming

Hongyun Yang,Ruimin Hu 보안공학연구지원센터 2013 International Journal of Multimedia and Ubiquitous Vol.8 No.2

Application of Biophysical Properties of Meridians in the Visualization of Pericardium Meridian

Xiong Feng,Xu Ruimin,Li Tongju,Wang Jinyu,Hu Qingchuan,Song Xiaojing,Wang Guangjun,Su Huanhuan,Jia Shuyong,Wang Shuyou,Zhu Zongxiang,Zhang Weibo 사단법인약침학회 2023 Journal of Acupuncture & Meridian Studies Vol.16 No.3

Background: The biophysical properties of the meridian system, an important concept of traditional Chinese medicine, include low impedance, resounding voice, and high acoustic conductance, all of which are helpful for elucidating the essence of meridians. Objectives: To visualize the human pericardium meridian (PC) based on the resounding voice property of meridians. Methods: Visualization of the PC was performed by injection of fluorescein sodium at the PC6 acupoint (Neiguan) on the PC. Before injection, percussion active points (PAPs) were identified by the virtue of their resounding voice properties. After injection, the trajectories of fluorescein migration throughout the body surface were recorded and analyzed. The distribution of fluorescein in the tissue was further studied using cross-sections of hind limbs of mini-pigs, in which fluorescein was injected into low impedance points. Results: The identified PAP lines were colocalized with PC. Following intradermal fluorescein injection, 1-3 fluorescent lines, which were unrelated to the arm veins, were observed in 7 of 10 participants; 85.4% of fluorescent signals were coincident with PAPs and their intensity had a negative correlation with the body mass index (r = –0.56, p = 0.045). Cross-sections showed a Y-shaped fluorescence pattern where the two migration lines on the surface were the two vertices of the “Y.” Conclusion: The trajectories of fluorescein in the body are suggestive of the anatomical structure of meridians. The PC is related to the deep horizontal interstitial channels that connect to the body surface through vertical interstitial spaces. These biophysical properties and techniques for meridian visualization are valuable for revealing the anatomical structure of meridians.