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Positiveness and monotonicity of continuum-continuum Coulomb dipole matrix elements
Oh, Sung Dahm Pratt, R.H. 숙명여자대학교 자연과학연구소 1992 자연과학논문집 Vol.- No.3
We present a proof that there are no zeros in nonrelativistic Coulomb continuum-continuum transition dipole matrix elements. There is a positive singularity in these matrix elements as the case of equal energies is approached. Considering one energy as fixed, matrix elements are monotonically increasing (decreasing) functions of the other energy below (above) the singular case. This is an extension of our earlier demonstration that the Coulomb dipole matrix elements, connecting a bound state to a state of greater energy, never vanish and are monotonic. For the present proof, we utilize asymptotic expansions of the matrix elements for large angular momentum, together with fixed energy recursion relations between pairs of successive angular momentum states (1.1-1) and (1-1.1). PACS number(s). 34.80-1, 32.70Cs, 31.10+2, 32.80-1
New Results for Analytic Properties of Nonrelativistic Dipole Matrix Elements
Oh, Sung Dahm 숙명여자대학교 자연과학연구소 1993 자연과학논문집 Vol.- No.4
The nonrelativistic Coulomb dipole matrix elements have been proved earlier to be always positive except for bound-bound transitions at zero transition energies. to be monotonically changing with energies and to be positively singular as the initial and final energies approach each other. Here we present the Coulomb dipole matrix elements at zero transition energies in bound states are negatively finite. We also show that screening effects can introduce a negative singularity to the dipole matrix element as the initial and final energies of continuum states approach each other.
Positiveness and monotonicity of continuum-continuum Coulomb dipole matrix elements
Oh, Sung Dahm,Pratt, R.H. 숙명여자대학교 자연과학연구소 1992 자연과학논문집 Vol.- No.3
We present a proof that there are no zeros in nonrelativistic Coulomb continuum-continuum transition dipole matrix elements. There is a positive singularity in these matrix elements as the case of equal energies is approached. Considering one energy as fixed, matrix elements are monotonically increasing (decreasing) functions of the other energy below (above) the singular case. This is an extension of our earlier demonstration that the Coulomb dipole matrix elements, connecting a bound state to a state of greater energy, never vanish and are monotonic. For the present proof, we utilize asymptotic expansions of the matrix elements for large angular momentum, together with fixed energy recursion relations between pairs of successive angular momentum states (1.1-1) and (1-1.1). PACS number(s). 34.80-1, 32.70Cs, 31.10+2, 32.80-1
Properties of Dipole Matrix Elements for Radiative Atomic Transitions
Oh, Sung Dahm 숙명여자대학교 자연과학연구소 1991 자연과학논문집 Vol.- No.2
The generality and systematics of dipole matrix elements for atomic transitions by radiation are discussed in the independent particle approximation. In this approximation the dipole matrix elements in the length and velocity forms are identical. The nonrelativistic Coulomb dipole matrix elements are always positive and monotonic in energy. However in the nonrelativistic screened potentials two structure features develop in the independent particle approximation dipole matrix elements for transitions form a bound state to a continuum state : zeroes(Cooper minima) and appearences of resonances(shape resonances).
Survey of Shape Resonances for Photoionizing Transitions
KIM, SOOKHYUN OH, SUNG DAHM CHOI, JEEHYE BAE, JEAN KIM, YOUNG SOON 숙명여자대학교 자연과학연구소 1989 자연과학논문집 Vol.- No.1
The existence of shape resonances for photoionizing transitions in ground state neutral atoms have been investigated using a one electron model with a Herman-Skillman central potential. The effective potential should have an attractive well near the nucleus and a repulsive barrier at the atomic region, and phase shifts of the final continuum wave functions should rapidly increase by π. Only Xe, Cs, Rn and Fr atoms have a shape resonance in transitions to the f channel.
Survey of Shape Resonances for Photoionizing Transitions
KIM, SOOKHYUN,OH, SUNG DAHM,CHOI, JEEHYE,BAE, JEAN,KIM, YOUNG SOON 숙명여자대학교 자연과학연구소 1989 자연과학논문집 Vol.- No.1
The existence of shape resonances for photoionizing transitions in ground state neutral atoms have been investigated using a one electron model with a Herman-Skillman central potential. The effective potential should have an attractive well near the nucleus and a repulsive barrier at the atomic region, and phase shifts of the final continuum wave functions should rapidly increase by π. Only Xe, Cs, Rn and Fr atoms have a shape resonance in transitions to the f channel.
Multipartite Entanglement Manipulation by Inherent Interactions
Jungmin Lee,Sung Dahm Oh 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
We investigate entanglement dynamics in multipartite systems with various forms of the interaction Hamiltonians. Since the interaction Hamiltonian not controlled by any external apparatuses but inherent in the given quantum system enables the quantum system to evolve as desired without any artificial gatings, it keeps at a minimum level of decoherence in the physical realization of quantum information technology. We present four interesting and potentially useful cases of quantum dynamical evolutions with the XY model and the XYZ model Hamiltonians. The entanglement can be generated, distributed, and controlled by clever design of the interaction Hamiltonian of a quantum system.
Entanglement Description of a Pure Multiqubit
Hyuk-jae Lee,Sung Dahm Oh 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
We present a description of the entanglement for a multiqubit by using the quantum correlation tensors that rely on the expectation values of the Pauli operators for a multiqubit state. Our description explains not only the total entanglement of the system but also the partial entanglement in subsystems. It shows that we have to consider the subsystem entanglement in order to obtain the full description for multiqubit entanglement. Furthermore, we offer an extension of the entanglement to multiqudits.
Kim, Dong Hyun,Lee, Dahm,Chang, Eun Hyuk,Kim, Ji Hyun,Hwang, Jung Won,Kim, Ju-Yeon,Kyung, Jae Won,Kim, Sung Hyun,Oh, Jeong Su,Shim, Sang Mi,Na, Duk Lyul,Oh, Wonil,Chang, Jong Wook Mary Ann Liebert 2015 STEM CELLS AND DEVELOPMENT Vol.24 No.20
<P>Our previous studies demonstrated that transplantation of human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs) into the hippocampus of a transgenic mouse model of Alzheimer's disease (AD) reduced amyloid-관 (A관) plaques and enhanced cognitive function through paracrine action. Due to the limited life span of hUCB-MSCs after their transplantation, the extension of hUCB-MSC efficacy was essential for AD treatment. In this study, we show that repeated cisterna magna injections of hUCB-MSCs activated endogenous hippocampal neurogenesis and significantly reduced A관42 levels. To identify the paracrine factors released from the hUCB-MSCs that stimulated endogenous hippocampal neurogenesis in the dentate gyrus, we cocultured adult mouse neural stem cells (NSCs) with hUCB-MSCs and analyzed the cocultured media with cytokine arrays. Growth differentiation factor-15 (GDF-15) levels were significantly increased in the media. GDF-15 suppression in hUCB-MSCs with GDF-15 small interfering RNA reduced the proliferation of NSCs in cocultures. Conversely, recombinant GDF-15 treatment in both in vitro and in vivo enhanced hippocampal NSC proliferation and neuronal differentiation. Repeated administration of hUBC-MSCs markedly promoted the expression of synaptic vesicle markers, including synaptophysin, which are downregulated in patients with AD. In addition, in vitro synaptic activity through GDF-15 was promoted. Taken together, these results indicated that repeated cisterna magna administration of hUCB-MSCs enhanced endogenous adult hippocampal neurogenesis and synaptic activity through a paracrine factor of GDF-15, suggesting a possible role of hUCB-MSCs in future treatment strategies for AD.</P>
Quantum Teleportation through Noisy Channels
Min, Hyegeun,Kim, Keun Ai,Oh, Sung Dahm 숙명여자대학교 자연과학연구소 2002 자연과학논문집 Vol.- No.13
주변환경과의 상호작용으로 인한 노이즈가 있는 양자 커뮤니케이션 채널은 적당한 Kraus 연산자 A_i에 의해 Kraus 재구성으로 단순화시킬 수 있다. 우리는 두 큐빗 계에서의 비트, 위상, 비트-위상, 크기 감폭, 위상 감폭, 편광 소멸에 대한 노이즈 모델을 세웠다. 우리는 그 각각의 노이즈를 가진 양자 채널에 대해 한 큐빗 원격이동을 수행했고, 신뢰도를 조사했다. The quantum communication channels which have noises by the interaction with environment can be modeled by the Kraus decompositon choosing the Kraus operators We establish the noise models; bit, phase and bit-phase flips, amplitude and phase dampings and depolarizing, for two qubit system. We perform a single qubit teleportation through the noisy two-qubit quantum channel and investigate the fidelity changes of final quantum state.