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AN ADDITIVE (U, β)-FUNCTIONAL EQUATION AND MODULE LINEAR MAPPINGS
황인호 경남대학교 수학교육과 2018 Nonlinear Functional Analysis and Applications Vol.23 No.3
Let A be a unital C^*-algebra. In this paper, we investigate the additive (u,β)- functional equation:f(x) + u^* f(uy) = β^{-1} f(β(x + y))for all unitary elements u in A and for a fixed nonzero complex number β. Using the fixed point method and the direct method, we prove the Hyers-Ulam stability of the additive (u,β)-functional equation in Banach modules.
계통연계 태양광발전시스템용 단상 인버터의 설계 및 제어
황인호,성세진,Hwang, In-Ho,Seong, Se-Jin 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.17 No.2
최근 태양전지, 연료전지를 이용한 새로운 발전시스템이 개발중에 있다. 특히 소규모 분산형 계통연계 태양광발전시스템은 가까운 장래에 폭 넓게 보급될것으로 예상된다. 태양전지 어레이를 계통선과 결합하는데 사용되는 인버터는 전체 태양광발전시스템의 성능을 결정하는 중요한 요소이다. 본 논문에서는 고조파를 포함한 무효전력 보상능력을 갖는 단상 태양광 인버터 시스템의 설계 및 제어기법을 제시하였다. 제안된 인버터 시스템에 의해 정류기 부하에 의해 발생된 무효전력이 보상될 수 있음을 실험결과로 보여준다. Recently, new generation systems using solar cells or fuel cells are under development. Particularly, it is expected that small scale, utility interactive, dispersed PV system will be widely diffused in the near future. The inverter used in coupling the PV array with utility lines is an important factor determining the overall performance of power generation systems. This paper presents the design and control method of the single-phase PV inverter system that is capable of compensating reactive power including harmonic distortions. It is shown that reactive power caused by rectifier load can be compensated by the proposed inverter system.
절식, 스트레스 및 냉각속도가 돼지도체의 사후 대사속도와 등심근의 육질에 미치는 영향
황인호,박범영,조수현,김진형,이종문 한국동물자원과학회 2004 한국축산학회지 Vol.46 No.1
The study was conducted to investigate the effects of practical variations in feed restriction, pre-slaughter handing and chilling regime on pork quality during ageing. A total of twenty male landraces were allocated into three treatments(i.e., pre-slaughter feeding, stress and chilling regime) in a factorial arrangement. pH, temperature, free calcium ions, WB-shear force, sarcomere length, cooking loss, drip loss and objective color were determined during rigor development and/or 1, 3, 7 d postmortem. Pre-slaughter chasing stress for approximately 15 min had no effects on pH/temperature profile and objective meat quality. There was an interaction(P<0.05) between the fasting treatment and chilling regime for muscle temperature at pH 6.2. Sarcomere length indicated that the current experiment conditions did not induce muscle shortening, with 1.7 to 108㎛, in spite of a significant effect of the fasting treatment (P<0.01). Pigs fed until the morning of slaughter showed a low WB-shear force(P<0.05) until 3 d at 1℃. The treatment also resulted in a higher Hunter L* and a*(P<0.05) at 24 h and 7 d. Fasted pigs showed a significantly(P<0.05) reduced cooking loss. The current results indicated that feeding upon the morning of slaughter became detrimental on meat color and the negative effect on cooking loss were linearly elevated with increased ageing time. On the other hand, WB-shear force did not distinguishable after 3 d. Collectively, it appeared that feed restriction from a day before slaughter could produce more a desirable meat quality at the time of consuming. However, the limited effect of animal handling and chilling rate on meat quality is not necessarily to extend to that these do not affect pork quality, as that largely depends on experimental design.