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鄭明勳 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-
We discuss how to decompose the Fock space of a many-fermion system embedded in two-dimensional square lattice. We first notice that the symmetry group inherent in the system is one of the two-dimensional space groups. We review the corresponding irreducible representations of the group. We then find the characters of the reducible representation of the many fermion Fock space. Using the characters, we obtain the multiplicity of each irreducible representation contained in the Fock space of a fixed number of fermions. We present specific examples, where we calculate the multiplicities which are the dimensions of the decomposed spaces.
Voltage Distribution of Power Source in Large AMOLED Displays
정명훈,김오현,정훈주 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.I
The voltage distribution of power lines in large Active Matrix Organic Light-Emitting Diode (AMOLED) displays was investigated as a function of panel size, OLED material, power line material and VDD structure in order to improve global brightness uniformity. In addition, the power source voltage distribution was investigated to determine the effect on crosstalk. These results indicate that new OLED materials with high efficiency and VDD lines made of a low-resistance material are essential for AMOLED panels larger than 2000 diagonally. Crosstalk was found to be due mainly to the abrupt voltage change of the power source on panels. A new mesh VDD structure is suggested as a solution to this problem.
Molecular Beam Epitaxy로 성장한 ZnSe 박막의 결정성 및 계면 특성의 평가
정명훈,장지호,김광희,김홍승,박승환,안형수,양민,오동철,Takafumi Yao 한국물리학회 2006 새물리 Vol.52 No.3
Various properties of ZnSe thin films grown on GaAs substrates by using molecular beam epitaxy (MBE) have been investigated. Photoluminescence (PL) measurement show the high optical quality of the samples in terms of the narrow linewidth, the strong luminescence intensity of band edge emission, and the temperature dependence of the luminescence properties. The dislocation density is estimated as 9.485 $\times$ 10$^7$ dis/cm$^2$ by using XRD measurements. Serious degradation of the crystallinity is not observed in the PL and the XRD results. However, the photocurrent measurement shows various deep states related with defects and impurities located at the heterointerface, which strongly stresses the importance of this measurement for evaluating the quality of thin films. The growth of low temperature buffer to improve the quality further is discussed. GaAs 기판 위에 molecular beam epitaxy (MBE)법으로 성장된 ZnSe 박막의 광학적, 구조적, 전기적 특성을 조사하였다. Photoluminescence (PL) 측정에서 좁은 반치폭을 갖는 강한 밴드단 발광과 온도에 따른 발광 특성을 통해 우수한 광학적 특성을 볼 수 있었다. 또한 $X$-ray diffraction (XRD) 측정으로 구한 9.485 $\times$ 10$^7$ dis/cm$^2$의 전위 밀도에서도 결정성이 양호함을 알 수 있었다. 그러나 광전류 측정을 통하여 박막의 질을 평가하는데 있어 중요한 이종 계면에 기인하는 결함 및 불순물의 존재를 확인하였다. 이런 특성 평가를 통하여 고품질의 박막을 얻기 위해 저온 버퍼층을 도입한 성장 방법을 제안하였다.
정명훈 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.7
We describe a simple method to find the ground-state energy for many-fermion systems via adiffusive time-evolving block decimation method. Matrix product states are used as candidatesfor an approximate ground state. We consider fermion exchange effects caused by hopping whileupdating the matrix product states consistently. This method is applicable to a wide class of fermionsystems. We test this method in a spinless fermion system by comparing the ground-state energyin the thermodynamic limit to the exact value.
상부 경추부의 아령 모양 신경초종의 단계적 수술- 증 례 보 고 -
정명훈,이상구,송관영,강동수 대한신경외과학회 2003 Journal of Korean neurosurgical society Vol.33 No.2
The authors report a case of high cervical giant dumbbell-shaped schwannoma. A 43-year-old man admitted for the evaluation of gait disturbance and hypesthesia below C2 dermatome for six years. Magnetic resonance imaging showed a large enhancing dumbbell-shaped mass, extending from carotid sheath to craniovertebral junction, and in C1, C2 spinal canal, which causes significant compression of the cervical cord posteriorly. we decided to do staged operations. First, the intraspinal portion was removed in order to decompress the spinal cord from the tumor. Second, residual extraspinal tumor was removed via high cervical retropharyngeal approach. The patient recovered well without any neurological deficit. Key words:Dumbbell-shaped schwannoma;Staged operation;Craniovertebral junction;High cervical retropharygeal approach.