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趙武濟,池平植,李世薰 충주대 산업과학기술연구소 1995 産業科學論文集 Vol.3 No.-
This paper deals with classification of load pattern in unit building. A typical load pattern has been an importance role in operation and cogeneration planning of unit building. A Kohonen SOFM has been applied to the measeured data in summer. Also, Correlation Cofficient method has for this. It is shown that the classification of load pattern is very useful.
池平植,趙武濟 忠州大學校 1995 한국교통대학교 논문집 Vol.30 No.2
In this study heating load and power load of winter were pattern-sorted by using neural network. In this pattern classification Kohonen Self-Organizing Feature Map was used and corelation coefficient of a week was counted as statistic approach. As a result, the usefulness of it was certified. The classification of this study can apply to the demand side management of the unit building usefully. Load pattern classification about much more building and the analysis of it are required continually.
신기영,강병두,김재웅 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
In an effort to develop design methods based on performance it is clear that the evaluation of the inelastic response is required. The methods available to the design engineer today are nonlinear time history analyses, or monotonic static nonlinear analyses, or equivalent static analyses with simulated inelastic influences. Some codes proposed the capacity spectrum method based on the nonlinear static(pushover) analysis to determine earthquake-induced demand given the structure pushover curve. This procedure is conceptually simple but iterative and time consuming with some errors. This paper considers a nonlinear direct spectrum method to evaluate seismic performance of structure, without iterative computations, given the structural initial elastic period and yield strength from the pushover analysis, especially for multi degree of freedom structures. The purpose of this paper is to investigate accuracy and confidence of this method from a point of view of various earthquakes.
면진구조의 동적특성에 따른 구조물의 진동거동에 관한 연구
김용주,강병두,전대한,김재웅 동아대학교 건설기술연구소 2001 硏究報告 Vol.25 No.1
Base isolation systems consists essentially of the installation of mechanisms which decouple the structure, and/or its contents, from potentially damaging earthquake-induced ground, or supports, motions. This decoupling is achieved by increasing the flexibility of the system, together with providing appropriate damping. In this paper, the effectiveness of base isolated structures under a variety conditions are evaluated and compared. The results of this study are as follow; Increasing the natural period and the damping capacity of the base isolated structures decreases structure's response to earthquake load. Base isolation can enhance the seismic performance of structures by increasing the fundamental period of the structure to beyond the energy-containing periods of earthquake motion, and by providing additional damping to dissipate motions that do develop. If period of base structure is longer than that of main structure, the natural period of combined structure approaches to that of base structure.
박진화,강병두,노필성,김재웅 동아대학교 환경문제연구소 2003 硏究報告 Vol.25 No.2
Recently, a variety of methods are proposed to solve the problems shown in a existing performance-based design of structure. The most accurate one among analysis methods for the performance evaluation of structure is nonlinear time history analysis. However, the approximate analysis methods in aspect of practicality and simplicity are needed. Even though there are linear capacity spectrum method and nonlinear capacity spectrum method through nonlinear static analysis as the representative approximate methods, a repetitive calculation process is consumed and the result is also likely to be inaccurate. Therefore, this research presents nonlinear direct spectrum method which directly enables nonlinear maximum response to derive, after obtaining the yielding strength and the frequency of structure from pushover curves, without going through a series of calculation processes. Also, it is proposed to compare and examine the accuracy and practicality through an example structure.
신기영,강병두,김재웅 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
In performance-based design methods, it is clear that the evaluation of the nonlinear response is required. Some codes proposed the capacity spectrum method(CSM) based on the nonlinear static analysis to determine earthquake induced demand given the structure pushover curve. This procedure is conceptually simple but iterative and time consuming with some errors. The nonlinear direct spectrum method(NDSM) is proposed and studied to evaluate nonlinear response of structures, without iterative computations, given by the structural linear vibration period and yield strength from the pushover analysis, especially for shear buildings system. The purpose of this paper is to compare accuracy of approximate nonlinear methods with respect to various structure characteristics.
박종윤,이상균,한기평,이재욱 성균관대학교 1991 論文集 Vol.42 No.1
n-type Si water(100) 위에 Mo를 1000Å을 증착한 후 400℃에서 120분간 pre-annealing(예비 열처리)하고 기존의 FA(Furnace Annealing) 방법과 본 실험실에서 개발, 제작한 RTA(Rapid Thermal Annealing) 장치로 post-annealing하여 hexagonal MoSi_2와 tetragonal MoSi_2를 형성하였다. 이는 XRD로 phase를 확인하였으며 AES depth profile를 이용하여 Si의 확산 메카니즘을 조사하였다. 기판의 온도가 400℃인 경우 MoSi_2의 형성이 용이하고 표면의 grain의 morphology 또한 FA방법에 비해 RTA방법이 크고 균일하게 형성되고 pre-annealing한 시편이 균일한 grain을 형성함을 알았다. 이는 grain의 morphology가 확산에 커다란 영향을 미치고 있음을 암시하고 있다. Mo films with a thickness of 1000Å were prepared on n-type Si(100) substrates by electron beam evaporation and heated to form the MoSi_2 of the hexagonal-and tetragonal-phase by the FA(Furnace Annealing) and RTA(Rapid Thermal Annealing) methods. The phases of Mo-silicide were confirmed by XRD. AES depth profiles were performed to obtain the Si distribution by the diffusion. Also, the change of MoSi_2 surface morphology was analyzed by SEM and EDX to investigate the mechanism of diffusion. When the substrate temperature was 400℃, well defined MoSi_2 was formed easily, the morphology of grain was distributed largely and uniformly. And it was found that the performance of the pre-annealing before post-annealing lead to lower about 150℃ for the formation temperature of very stable MoSi_2.
Pyeong An Kim(김평안),Yeon Uk Kim(김연욱),Ui Yeon Nam(남의연),Jae Hun Yang(양재훈),Yu Mi Woo(우유미),Jae Jun Lee(이재준),Hyeryeon Seo(서혜련),Jung Hwan Park(박정환) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
One-dimensional metallic nanowires (NWs) have been studied for flexible transparent conductors to replace indium tin oxide due to their brittleness and high costs. Flash-induced heating methods have received attention as a new technique for next-generation flexible electrodes, because of their advantages such as fast processing, large area processability, and compatibility with roll-to-roll manufacturing. Herein we report flexible AgNWs conductors with outstanding optoelectronic properties and robust adhesion on flexible substrates. Localized photothermic energy could occur at the junctions of AgNWs by flash light, resulting in an entirely welded AgNW network. At the same time, the interface of AgNWs and underlying PET film could be melted by the near-infrared (NIR) spectrum of flashlight, which increased the adhesion of the AgNWs by 310 %. To confirm the practical uses of our technique, we successfully fabricated a high-quality transparent energy harvester by using flash-welded AgNW network.