Effect of structural phase transformations under pressure on electronic and optical properties of CuInS2

Bo Gao,Hong-Tao Xue,Fu-Ling Tang,Yu-Wen Cheng 한국물리학회 2017 Current Applied Physics Vol.17 No.11

First-principles plane-wave calculations were employed to study the phase transitions, electronic and optical properties of chalcopyrite CuInS2 (CIS) under pressure, which is a promising semiconductor compound material for nonlinear optical, photovoltaic and bio-applications. From the variations of Gibbs free energy and volume with pressure, we confirmed an experimentally found phase transformation of CIS from tetragonal I42d structure into the cubic Fm3m phase. It occurs at 7.9 GPa with a volume reduction of 15.6%, which are comparable with the experimental values of 9.5 GPa and 12%. A new possible phase transition of CIS from the cubic Fm3m structure to the orthorhombic Cmcm structure under higher pressure was predicted occurring at 49.6 GPa with a volume reduction about 0.64%. Using the more accurate HSE06 functional, we found that the growth rate of energy gap with pressure (dEg/dP) for the I42d phase is about 24.8 meV/GPa, very close to the experimental value of 24 meV/GPa. The calculated electronic properties for Fm3m and Cmcm phases show that CIS is a metallic material under high pressure, rather than a semiconductor. The optical absorption spectra indicate that with the increase of pressure the absorption edge of CIS becomes smaller while the optical energy gap is larger.

Protective Effects of Silibinin and Its Possible Mechanism of Action in Mice Exposed to Chronic Unpredictable Mild Stress

( Wen Jing Yan ),( Ying Chun Tan ),( Ji Cheng Xu ),( Xian Ping Tang ),( Chong Zhang ),( Peng Bo Zhang ),( Ze Qiang Ren ) 한국응용약물학회 2015 Biomolecules & Therapeutics(구 응용약물학회지) Vol.23 No.3

Silibinin, a natural flavonoid antioxidant isolated from extracts of the milk thistle herb, has recently been identified as having antihepatotoxic and anticancer properties. In this paper, we investigated the effects of silibinin on behavior and neuroplasticity in mice subjected to chronic unpredictable mild stress (CUMS). After 5 consecutive weeks of CUMS, the mice were treated with silibinin (100 mg/kg, 200 mg/kg and 400 mg/kg by oral gavage) for 3 consecutive weeks. The results showed that silibinin administration significantly alleviated the CUMS-induced depressive-like behavior, including the total number of squares crossed and the frequency of rearing in the open field test, the immobility time in the tail suspension test and the forced swimming test. Furthermore, silibinin treatment increased the levels of brain-derived neurotrophic factor (BDNF), serotonin (5-HT) and norepinephrine (NE) in the prefrontal cortex and hippocampus. Our study provides new insight into the protective effects of silibinin on the depressive status of CUMS mice, specifically by improving neuroplasticity and neurotransmission.

One-Pot Synthesis, Crystal Structures and Thermal Properties of Two Three-Dimensional Cobalt(II) Complexes

Bo Tao,Wen Lei,Feiran Cheng,Hua Xia 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.6

Two cobalt(II) compounds [Co(2,2'-bipy)(H2O)2(SO4)]n (1) and [Co2(2,2'-bipy)2(btec)(H2O)6]·2H2O (2) (2,2'- bipy = 2,2'-bipyridine, H4btec = 1,2,4,5-benzenetetracarboxylic acid), have been simultaneously synthesized by a one-pot slow solvent evaporation reaction. Their structures were determined by single-crystal X-ray diffraction and further characterized by X-ray powder diffraction (XRPD), IR, elemental and thermogravimetric analysis (TGA). The structural analysis reveals that compound 1 exhibits an infinite 1D chain structure with the octahedral Co(II) centers bridging by the tetrahedral μ2-SO4 2− ligands, while compound 2 possesses a dinuclear Co2(2,2'-bipy)2(btec)(H2O)6 unit and the two adjacent octahedral Co(II) ions are linked by the bismonodentately coordinated btec ligand. Additionally, compound 2 exhibits blue fluorescent emission in the solid state at room temperature.

A Data Fusion Algorithm of the Nonlinear System Based on Filtering Step By Step

Cheng-lin Wen,Quan-bo Ge 대한전기학회 2006 International Journal of Control, Automation, and Vol.4 No.2

This paper proposes a data fusion algorithm of nonlinear multisensor dynamic systems of synchronous sampling based on filtering step by step. Firstly, the object state variable at the next time index can be predicted by the previous global information with the systems, then the predicted estimation can be updated in turn by use of the extended Kalman filter when all of the observations aiming at the target state variable arrive. Finally a fusion estimation of the object state variable is obtained based on the system global information. Synchronously, we formulate the new algorithm and compare its performances with those of the traditional nonlinear centralized and distributed data fusion algorithms by the indexes that include the computational complexity, data communicational burden, time delay and estimation accuracy, etc .. These compared results indicate that the performance from the new algorithm is superior to the performances from the two traditional nonlinear data fusion algorithms.

Modulation of contact resistance between metal and graphene by controlling the graphene edge, contact area, and point defects: An <i>ab initio</i> study

Ma, Bo,Gong, Cheng,Wen, Yanwei,Chen, Rong,Cho, Kyeongjae,Shan, Bin American Institute of Physics 2014 Journal of Applied Physics Vol.115 No.18

Associations Between Mammography and Ultrasound Imaging Features and Molecular Characteristics of Triple-negative Breast Cancer

Li, Bo,Zhao, Xin,Dai, Shao-Chun,Cheng, Wen Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.8

Background: The triple-negative breast cancer (TNBC) is an aggressive cancer characterized by the absence of estrogen receptor (ER), progesterone receptor (PR) and human epidermal growth factor receptor 2 (HER2). Preoperative mammography and ultrasound features of TNBC may potentially suggest characteristics of the disease and assist in treatment decisions. Materials and Methods: The study covered 153 patients with TNBC from May 2011 to May 2012 who were confirmed by postoperative pathology results in our hospital. We compared the radiological findings among the patients and sought to determine the significant iconographic features. The biomarkers p53 and Ki-67 are regarded as significant factors in TNBC. They were therefore used to divide the TNBC into four groups for assessment of relationships with TNBC imaging features. Results: On mammography, most TNBCs exhibit obscure (44.3%) masses. On ultrasound, the majority of masses (95.4%) were predominantly indistinct (50.7%), irregular (76.0%) or featuring posterior echo enhancement/shadowing. Color Doppler flow imaging (CDFI) emphasized hypervascular (32.9%) masses. Differences in CDFI by ultrasound among the four groups were statistically significant (p=0.009). There were obvious differences in the percentages of spiculated margin (p=0.049) and intensive posterior echo (p=0.006) with spotty flow imaging by ultrasound between the Ki-67 (+) p53 (+) and other groups. Conclusions: A combination of mammography and ultrasound revealed the imaging characteristics of TNBC included an obscure mass with less attenuated posterior echoes and some vascularity. A worse prognosis was associated with spiculated margin and intensive posterior echoes with spotty flow imaging.

The characteristics of the multi-span suspension bridge with double main cables in the vertical plane

Li-wen Zhang,Ru-cheng Xiao,Yang Jiang,Sheng-bo Chai 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.3

The multi-span suspension bridge having double main cables in the vertical plane is investigated regarding endurance of live load distribution in the case of non-displaced pylon and pylon displacement. The coefficient formula of live load distribution described as the ratio of live load on the bottom cable to the top cable is obtained. Based on this formula, some function in respect of this bridge are derived and used to analyze its characteristics. This analysis targets the cable force, the cable sag and the horizontal displacement at the pylon top under live load etc. The results clarified that the performance of the live load distribution and the horizontal force of cables in the case of non-deformed pylon has a similar tendency to those in the case of deformed pylon, and the increase of pylon rigidity can increase live load distributed to the bottom cable and slightly raise the cable horizontal force under live load. However, effect on the vertical rigidity of bridge and the horizontal force increment of cables caused by live load is different in the case of non-deformed pylon and deformed pylon.

One-Pot Synthesis, Crystal Structures and Thermal Properties of Two Three-Dimensional Cobalt(II) Complexes

Tao, Bo,Lei, Wen,Cheng, Feiran,Xia, Hua Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.6

Two cobalt(II) compounds $[Co(2,2{^\prime}-bipy)(H_2O)_2(SO_4)]_n$ (1) and $[Co_2(2,2^{\prime}-bipy)_2(btec)(H_2O)_6]{\cdot}2H_2O$ (2) (2,2'-bipy = 2,2'-bipyridine, $H_4btec$ = 1,2,4,5-benzenetetracarboxylic acid), have been simultaneously synthesized by a one-pot slow solvent evaporation reaction. Their structures were determined by single-crystal X-ray diffraction and further characterized by X-ray powder diffraction (XRPD), IR, elemental and thermogravimetric analysis (TGA). The structural analysis reveals that compound 1 exhibits an infinite 1D chain structure with the octahedral Co(II) centers bridging by the tetrahedral ${\mu}_2-SO{_4}^{2-}$ ligands, while compound 2 possesses a dinuclear $Co_2(2,2^{\prime}-bipy)_2(btec)(H_2O)_6$ unit and the two adjacent octahedral Co(II) ions are linked by the bismonodentately coordinated btec ligand. Additionally, compound 2 exhibits blue fluorescent emission in the solid state at room temperature.

Complex Regulatory Network of MicroRNAs, Transcription Factors, Gene Alterations in Adrenocortical Cancer

Zhang, Bo,Xu, Zhi-Wen,Wang, Kun-Hao,Lu, Tian-Cheng,Du, Ye Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.4

Several lines of evidence indicate that cancer is a multistep process. To survey the mechanisms involving gene alteration and miRNAs in adrenocortical cancer, we focused on transcriptional factors as a point of penetration to build a regulatory network. We derived three level networks: differentially expressed; related; and global. A topology network ws then set up for development of adrenocortical cancer. In this network, we found that some pathways with differentially expressed elements (genetic and miRNA) showed some self-adaption relations, such as EGFR. The differentially expressed elements partially uncovered mechanistic changes for adrenocortical cancer which should guide medical researchers to further achieve pertinent research.

중국 주거문화와 가정교육을 융합한 주거 공간에서의 교육행위 특성 연구

고성림(Gao Cheng Lin),노박문(Lu Bo Wen),정미선(Chung Mi Sun) 한국전시산업융합연구원 2019 한국과학예술융합학회 Vol.37 No.3

본 논문은 중국 주거문화의 교육 속성을 기초 연구대상으로 하여, 주거 공간에서의 “상(象)”(무형)과 문화적 사상, 심미(审美), 상징과 “형(形)”(유형)문의 공간을 표현, 장식적 상징성을 융합 및 연구하였다. 각 요소가 반영된 주거공간의 특성과 가정교육의 연관성을 기준으로 분석하였다. 또한 중국의 전통 주거공간(명청시대를 대표하는 삼진사합원(三进四合院)) 과 현대 주거공간(20세기 말의 공동주택)에서의 교육행위 특성을 비교하고, 주거공간 설계에서의 교육의 중요성을 강조하여 “덕육(德育)”교육과 학습 성장의 연관성, 교육의 역할, 교육 공간, 정경체험(情景体验) 특성의 차이성 등을 도출해내어 미래 주거 공간에서 가정교육 공간의 디자인 방향의 근거를 제시하고 있다는 점에서 의의가 있다. 연구과정과 내용은 다음과 같다. 첫 번째, 중국 주거문화와 가정교육의 융합성을 바탕으로 주거공간의 “상(象)”(무형)문화와 “형(形)” 문화 두 가지 측면에서 출발하여, 사상, 심미, 상징, 공간표현, 장식의 5가지 측면에서 문화적 배경에 기초한 주택공간과 교육특성의 상관성을 연구 분석한다. 둘째, 전통주거공간과 현재주거공간의 교육적 속성에 기초하여 "상(象)"문화에서는 조상 숭배, 존비유서(尊卑有序), 장유유서, 남녀유별, 좌북남조(坐坎朝离), 사법자연(师法自然:자연에서 배우다), 경중구분, 도덕품격 등의 8개 요소, 그리고 "형(形)"문화에서는 향심성(向心性), 방향성, 주거공간의 내외부, 실내공간의 방과 방, 문양 등의 5개요소를 기준으로 하여 분석하였다. 셋째, 위에서의 과정을 통해 전통과 현대 주거 공간에서의 교육적 특성을 구체적으로 비교 분석하고, 전통 주택 공간에서 가풍가규(家风家规), 학규(学规)성장, 품행 가치와 현대주택 공간에서의 가족 문화, 학습 성장, 사회적 가치 등의 6가지 측면의 통일성과 차이점을 도출한다. 네 번째, 전통과 현대 주거 공간의 6대 교육특성을 기준으로 주거공간에서의 “덕육(德育)”과 학습 성장 두 가지 측면을 비교하여 가정교육을 도출하고, 현대 주거공간 디자인에 접목 시킬 수 있는 새로운 니즈를 도출한다. 본 연구를 통해 얻은 결과는 가정교육 행위가 미래주거 공간의 디자인 및 발전에 영향을 끼친다는 것이다. 또한, 전통과 현대의 가정교육과 주거 공간의 연관성을 비교하여 주거문화와 가정교육을 융합한 주거공간에서의 교육행위 특성을 도출 및 아래 몇 가지 측면으로 정리할 수 있다. 공통점은 (1) 주거 공간 중 가정에서 “덕육(德育)”은 가정교육의 핵심이다. (2) 학습 성장은 가정교육의 주체이다. 위 두 가지로 정리 할 수 있고, 차이점은 전통 주거 공간에서의 교육 행위는 가정의 교육과 교육의 계승에 중점을 두는 반면, 현대 주거 공간에서의 교육 행위는 우수한 전통적 교육 문화 계승을 제외한다는 것에 있다. (1) 교육 역할의 갱신에 더 중점을 두고 있으며, 전통 방식의 수동적 교육행위에서 주동적 “활(活)교육”행위로 전환 되었다. (2) 탄력적인 교육공간의 확대. 주거 공간 내부의 사용은 평등하며, 명확한 공간의 경계가 없다. 또한 공공 공간이 확대되어, 자녀와 함께하며 자녀의 학습습관을 기르는 을 중시한다. (3) 정경체험(情景体验) 기능과의 융합. 현대 주거 공간은 디지털 기술 매체의 발전으로, 상황 시뮬레이션과 예술 체험 등의 보조 교육을 통해 아이들의 봉사 의식과 창의력을 키운다. 이 내용은 향후 미래 주거 공간에서의 가정교육 공간 디자인 갱신을 위한 기초와 근거로 제시될 수 있다. In this thesis, the author takes the educational attribute of Chinese residential culture as the basic research object and integrates the ideology, aesthetic appreciation and symbolization of residence space’s “XIANG” (Intangible Factor) culture and the space expression and decoration factors of “XING” (Tangible Factor) to reflect the relevance between residence space’s characters and family education, which are taken as the analysis standard. Moreover, the author makes a comparative analysis on educational behavior characteristic of Chinese traditional spacing residence space (represented by three-tier courtyard house in the period of Ming and Qing Dynasty) and modern residence space(suite residence in the late 20C). The author also emphasizes education’s importance in residence space design and highlights the correlation between “moral” education and learning growth, the differences of educational roles, educational spaces and scene experience characteristics, thus providing a basis for the design of family education space in the future residence. Firstly, from the perspective of integration between Chinese residential culture and family education, the author starts to make analysis from residence space’s “XIANG” (Intangible Factor) culture and “XING” (Tangible Factor) culture so as to discuss and analyze the correlation between residence space and educational characteristics on the cultural background from the five aspects: ideology, aesthetic appreciation, symbolization and space expression. Secondly, based on educational attribute of traditional residence space and modern residence space, the author makes an analysis on the standard of “XIANG” culture’s ancestral worship, respect for hierarchy and order, differences between man and woman, face south, learning from nature, clear distinction between the primary and the secondary as well as “XING” culture’s five factors: centrality, directionality, inside and outside of residence space, rooms of residence interior space and pattern design. Thirdly, through the process mentioned above, the author specifically makes a comparative analysis on the educational characteristics of traditional and modern residence space, thus leading out the uniformity and differences between traditional residence space’s family traditions and rules, learning rules for growth, moral value and modern residence space’s family culture, learning growth and social value. Fourthly, on the basis of six major educational characteristics of traditional and modern residence, the author makes a comparison, thus getting family education’s importance in residence space’s “moral education” and learning growth. Moreover, new requirements for modern residence space design are proposed. From this research, the author gets a consequence that family’s educational behaviors have an influence on the design and development of future residence space. In contrast with traditional and modern family education’s relevance with residence space, the author gets that the educational behavior characteristics of residence space with the integration of residential culture and family education are mainly presented as the following aspects: the similarities are: (1) Family’s “moral education” in residence space is the core of family education. (2) Learning growth is the main part of family education; The different points are: Traditional residence space’s educational behaviors place emphasis on the inheritance of education for home teaching rules; while in modern residence space’s educational behaviors, besides inheriting traditional educational culture, (1) The update of educational role is paid more attention. The educational behavior of traditional passive teaching is changed into positive “living education” behavior. (2) The flexible educational space is enlarged. Residence space’s internal use is equal without specific space limit; public space is expanded and the interactive behaviors and learning habit of parent-offs