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Reaction Dynamics of Continuous Time Random Walker in Heterogeneous Environment
성재영,Seong, Jae-Yeong Korean Chemical Society 2006 대한화학회지 Vol.50 No.4
연속시간 무작위 운동자의 반응이 없을 경우 동력학과 반응이 있는 경우 반응 동력학과의 정확한 상관관계를 보고하였다. 이 상관 관계는 연속시간 무작위 운동자가 그 공간적 위치와 운동의 방향에 따라 다른 운동 성질을 가지는 경우에도 성립한다. 이 결과의 적용범위는 무작위 운동자가 한번에 일정한 거리만 움직이는 경우뿐 아니라 보다 일반적인 경우에도 적용할 수 있으며, 일차원 계와 더불어 등방성을 가지는 다차원 계에도 적용할 수 있다. We report an exact relation between the survival probability, the revisit time distribution, and the reaction-free propagator of the continuous time random walker. The relation holds even for such a general case where the random walker has a distinct jump dynamics at each lattice site, which may be dependent also on the direction of the jump. The application range of the obtained relation is not limited to the nearest neighbor hopping in the bulk lattice either. The result is applicable to a higher dimensional system with the spherical symmetry as well as it is to the one-dimensional system.
Plaque Patterned Cutaneous Candidiasis on the Lower Legs: A Case Report
성재영,임지원,김창용,조영아,이양원,최용범,유다애 대한의진균학회 2023 대한의진균학회지 Vol.28 No.4
Diabetes mellitus (DM) is a metabolic disorder that causes chronic hyperglycemia, leading to immune dysfunction and increased vulnerability to infections. As a result, patients with DM are more susceptible to fungal infections, including Candida species, due of their weakened immune systems. Cutaneous candidiasis is a fungal infection that appears as a red plaque with peripheral satellite papules and pustules around the periphery. Patients with chronic mucocutaneous candidiasis may have erythematous plaques and thickened skin thickening with an overlying scale, which can mimic plaque psoriasis. Therefore, fungal infections should be considered when assessing chronic refractory psoriasiform lesions that are difficult to treat, especially in patients with DM. This report describes a case of cutaneous candidiasis in both lower legs, which was initially misdiagnosed as psoriasis.
Molecular Co-evolution of Gonadotropin-releasing Hormones and Their Receptors
성재영,권혁방 한국통합생물학회 2007 Animal cells and systems Vol.11 No.2
Gonadotropin-releasing hormone (GnRH),synthesized in the hypothalamus, plays a pivotal role in theregulation of vertebrate reproduction. Since molecularisoforms of GnRH and their receptors (GnRHR) have beenisolated in a broad range of vertebrate species, GnRH andmolecular co-evolution of a peptide ligand-receptor pair.Vertebrate species possess multiple forms of GnRH, whichhave been created through evolutionary mechanisms suchas gene/chromosome duplication, gene deletion andmodification. Similar to GnRHs, GnRH receptors (GnRHR)have also been diversified evolutionarily. Comparativeligand-receptor interaction studies for non-mammalian andmammalian GnRHRs combined with mutational mappingstudies of GnRHRs have aided the identification of domainsor motifs responsible for ligand binding and receptorGnRHR co-evolution, particularly the structure-functionrelationship regarding ligand selectivity and signal transductionof mammalian and non-mammalian GnRHRs.
First Passage Time between Ends of a Polymer Chain
성재영,Sung, Jae-Young Korean Chemical Society 2007 대한화학회지 Vol.51 No.3
윌렘스키-픽스만(Wilehemski-Fixmann)의 사슬고분자 내 화학반응동력학 이론을 반응 그룹들 간의 배제효과를 고려하여 개선하였다. 가우스 체인 양극단 반응 모델의 반응 동력학에 대한 해석적인 표현을 얻어 이를 브라운 동력학 모의 실험결과와 비교하였다. 비교결과 본 이론의 예측이 기존 이론들의 예측 보다 모의실험 결과와 더 잘 일치하였다. We improve Wilehemski-Fixmann theory for intrachain reaction dynamics of a polymer chain by taking into account excluded volume effects between reactive groups in the polymerchain. An approximate analytic expression for the intra-chain reaction dynamics is obtained for Gaussian chain model and compared to Brownian dynamics simulation results. The results of the present theory are in a better agreement to Brownian dynamics simulation results than those calculated by previously reported theories.
SONOS NAND 플래시 메모리 소자에서의 lateral charge migration에 의한 소자 안정성 연구
성재영,정준교,이가원 한국반도체디스플레이기술학회 2019 반도체디스플레이기술학회지 Vol.18 No.4
As the NAND flash memory goes to 3D vertical Silicon-Oxide-Nitride-Oxide-Silicon (SONOS) structure, the lateral charge migration can be critical in the reliability performance. Even more, with miniaturization of flash memory cell device, just a little movement of trapped charge can cause reliability problems. In this paper, we propose a method of predicting the trapped charge profile in the retention mode. Charge diffusivity in the charge trapping layer (Si3N4) was extracted experimentally, and the effect on the trapped charge profile was demonstrated by the simulation and experiment.