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이광세 한국하이데거학회 2005 현대유럽철학연구 Vol.0 No.11
이광세교수는 니시타니철학, 불교철학, 장자철학 등의 눈으로 서양의 여러 철학사상을 해명하는 일에 주력하고 있다. 칸트철학은 물론이고, 특히 비트겐슈타인과 하이데거, 로티의 철학을 니시타니 철학, 장자의 철학, 동아시아의 심미적 철학이란 눈으로 비교, 해석하는 철학 작업을 오랫동안 수행하고 있다. 이 논문 역시 그러한 철학 작업의 성과 가운데 하나로, 철학의 존재자성과 무와의 관련, 은폐와 비은폐성을 중심으로 하이데거 철학에서의 "존재 의미"를 규명하고 있다. 필자는 이런 구별을 하이데거철학과 니시타니의 철학과의 연관에 따라 해명하려한다. 그러한 철학 작업을 철학사에 대한 전반적 지식을 바탕으로 존재이해의 역사를 규명한 뒤, 그 배후에 감춰진 존재 망각의 내용을 무에 대한 불교철학적 이해, 니시타니 철학의 맥락에 따라 설명하고 있다.
고체 전해질로서의 LiH<sub>2</sub>PO<sub>4</sub> 결정
이광세,조중석,김금채,전민현,Lee, Kwang-Sei,Cho, Joong-Seok,Kim, Geum-Chae,Jeon, Min-Hyon 한국재료학회 2009 한국재료학회지 Vol.19 No.4
Lithium dihydrogen phosphate ($LiH_2PO_4$) powder was purchased from Aldrich Chemical Co. From the scanning electron microscope (SEM) observation, these polycrystals have dimensions in the range of $25-250{\mu}m$. The electrical conductivity was measured at a measuring frequency of 1 kHz on heating polycrystalline lithium dihydrogen phosphate ($LiH_2PO_4$) from room temperature to 493 K. Two anomalies appeared at 451 K ($T_{p1}$) and 469 K ($T_{p2}$). The electrical conductivity reached the magnitude of the superprotonic phases: $3{\times}10^{-2}{\Omega}^{-1}cm^{-1}$ at 451 K ($T_{p1}$) and $1.2{\times}10{\Omega}^{-1}cm^{-1}$ at 469 K ($T_{p2}$). It is uncertain whether the superprotonic phase transformations are due to polymorphic transitions in the bulk, surface transitions, or chemical reactions (thermal decomposition) at the surface. Considering several previous thermal studies (differential scanning calorimetry and thermogravimetry), our experimental results seem to be related to the last case: chemical reactions (thermal decomposition) at the surface with the progressive solid-state polymerization.
Electrical Conductivity in KHCO3
이광세,이해준,강선희,김일원,김진수,안창원 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.2
The d.c. electrical conductivity of KHCO3 was measured at 293 K below the antiferrodistortive phase transition (Tc = 318 K). The obtained values along the a* axis and along the b axis were, respectively, σa* = 2:60 × 10-11Ω-1cm-1 and σb = 5.30 ×10-11Ω-1cm-1, indicating that KHCO3 is a poor proton conductor. The experimental results are discussed in terms of the intrabond and/or interbond jumps of protons in the hydrogen bonds. The d.c. electrical conductivity of KHCO3 was measured at 293 K below the antiferrodistortive phase transition (Tc = 318 K). The obtained values along the a* axis and along the b axis were, respectively, σa* = 2:60 × 10-11Ω-1cm-1 and σb = 5.30 ×10-11Ω-1cm-1, indicating that KHCO3 is a poor proton conductor. The experimental results are discussed in terms of the intrabond and/or interbond jumps of protons in the hydrogen bonds.
이광세,서정아,황윤홰,김형국,이철의,Kusuo Nishiyama 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.2
Raman spectra of polycrystalline squaric acid (H2C4O4) were measured in the frequency shift region of 150 - 4000 cm-1 below and above the antiferroelectric phase transition (Tc = 373 K). No marked changes of internal vibrations of the H2C4O4 molecule in the crystal were observed up to 473 K, indicating that the symmetry of the H2C4O4 in the antiferroelectric phase persisted to the paraelectric phase. Raman spectra of polycrystalline squaric acid (H2C4O4) were measured in the frequency shift region of 150 - 4000 cm-1 below and above the antiferroelectric phase transition (Tc = 373 K). No marked changes of internal vibrations of the H2C4O4 molecule in the crystal were observed up to 473 K, indicating that the symmetry of the H2C4O4 in the antiferroelectric phase persisted to the paraelectric phase.
Lambda ($\lambda$) Transition in the Heat Capacity by Finite Block Spin Phenomenology
이광세,구제환,이철의 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.11
We explain the lambda ($\lambda$) transition in the heat capacity in terms of spin freezing on the basis of finite-sized block spin concepts. Thus, the spin-glass phase or the antiferromagnetic/paramagnetic phase near the N\'eel temperature may be considered as a short-range ordering of the block spins comprised of many random spins with respective majority spin directions. Using the Curie law for the block spins, we obtain the $\lambda$-type heat capacity in the lower and the higher temperature approximations of the Brillouin function. The theoretical heat capacity gives a good fit to the experimental data.