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임대인의 포트폴리오전략관점에서 본 임대주택시장의 전월세전환율
이성찬,임창호,이창무 한국주택학회 2003 한국주택학회 학술대회 발표논문집 Vol.2003 No.3
It is an unique feature of the Korean rental housing market that the lease system is largely dualized by 'Jeonsei'(up-front lump-sum rent deposit) and monthly rent contracts. The Conversion rate for Jeonsei-to-monthly rent(monthly rent rate) play a role to compare a different level of rent among the various contract types. The meaning of the Conversion rate which is a financial opportunity cost of the Jeonsei deposit or security deposit can be understood as the required rate of return of equity invested in housing or the market interest rate or portfolio return of both. This study adopts that the conversion rate can be a portfolio return and induce related variables such as market interest rate and expected capital appreciation. The results show that the conversion rate will be high in sub-market where expected capital appreciation is high, the market interest rate is high in terms of portfolio return model. Futhermore, the conversion rate can be affected by negotiations process between houseowner and tenants.
이성찬,류종관,전진용 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1
The degree of diffusion, characterized by the "scattering coefficient" of surface materials has been known to be one of the most important factors in determining the acoustical qualities of concert halls. The diffusion phenomenon allows greater musical appreciation by affecting early and reverberant sound in a concert hall. Following the knowledge, gained from many experiments based on the suggested ISO method, a box-type diffuser was planned for walls of the 400-seat Milal Concert Hall. The ceramic tiles ranging from 10 to 20cm in width and length, have a height up to 20cm, which were produced by a ceramic artist, in cooperation with an acoustician and an architect. The scattering coefficient was measured at 1/10 scale using different arrangements. The results were satisfactory: the overall scattering coefficients were 0.61-0.62. During tuning concerts, the acoustics of Milal concert hall was appreciated by several soloists, ensemble players and orchestra conductors. The overall impressions of the audiences from the early performances have been pleasant in terms of its fullness of tones with abundant high pitch.
Pb(Zr,Ti)O3 세라믹스에서 Bi계 세라믹스의 치환에 따른 상전이 온도 변화
이성찬,왕림,여홍구,조종호,성연수,김명호,송태권 한국물리학회 2009 새물리 Vol.58 No.5
Pb(Zr,Ti)O3 (PZT)의 상경계영역 (MPB) 조성에 Bi(Zn1/2Ti1/2)O3와 BiAlO3를 치환하면서 압전 및 유전특성을 조사하였다. 시편은 일반적인 고상반응법으로 제조하였고 X-선회절패턴을 통해 페로브스카이트 구조를 확인하였다. Bi계 세라믹스가 치환됨에 따라 큐리온도(TC)는 치환되지 않은 PZT의 큐리온도에 비해 감소하였다. 압전상수 (d33))와 전기기계결합계수 (Kp)의 값은 Bi(Zn1/2Ti1/2)O3와 BiAlO3을 각각 5mol% 치환하였을 경우에 가장 높은 값을 나타내었고 그 이후 치환량에 따라 감소하였다. The dielectric and piezoelectric properties of (1−x)Pb(Zr,Ti)O3-xBi(Me)O3 (Me: Zn, Ti, Al) ceramics with morphotropic phase boundry (MPB) composition were investigated. All samples were prepared by using a conventional solid state reaction method and were confirmed to have a perovskite structure by using X-ray diffraction. The Curie temperature of the Pb(Zr,Ti)O3 ceramics decreased with Bi(Me)O3 substitution. The maximum values of the piezoelectric constant (d33) and the electromechanical coupling coefficient (Kp) were obtained at 5 mol% Bi-based ceramics substitutions, after which the values decreased.