https://pubs.kist.re.kr/handle/123456789/75365 2026-04-15T18:26:56Z https://pubs.kist.re.kr/handle/201004/130807 Title: Stability enhancement of haptic interaction by frequency-dependent damping and its application to scaled teleoperation Authors: Lim, Yo-An; Kim, Jong-Phil; Ryu, Jeha Abstract: This paper presents a frequency-dependent damping element, called an analog input shaper (AIS), to improve the stability of haptic interaction with virtual or real environments. High frequency inputs to a haptic interface, which usually occur in the collision with very stiff objects, can bring limit cycle oscillations and instabilities. In order to reduce these high frequency inputs and thus to improve the stability of haptic interaction, the AIS is added to the haptic system. Moreover, the AIS is applied to a passivity-based haptic stability control algorithm, called an energy-bounding algorithm (EBA), to increase the displayed impedance range by the EBA. Through scaled teleoperation experiments using an atomic force microscope (AFM), we show that the AIS can enhance stability during haptic interaction and consequently increase impedance range that a haptic interface can stably display. Also, we show that the AIS can alleviate conservativeness of the passivity-based haptic control algorithms. 2011-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/130806 Title: Field-emission properties of patterned ZnO nanowires on 2.5D MEMS substrate Authors: Park, Seung-Beum; Kim, Byeong-Guk; Kim, Jeong-Yeon; Jung, Tae-Hwan; Lim, Dong-Gun; Park, Jae-Hwan; Park, Jae-Gwan Abstract: We fabricated a nanowire-based field-emission display (FED) device on a 2.5D substrate using a photolithography, lift-off, thermal-evaporation, and plasma-etching process. We first fabricated a 3x3 array of microholes (diameter = 400 mu m and depth = 50 mu m) on a Si substrate and fabricated ZnO nanowires inside the microholes by using a thermal CVD process. The field-emission pattern image of the 3x3 array of microholes was clearly apparent. The threshold emission field was ca. 5.6 V/mu m and we obtained considerable brightness when the applied voltage was 1900 V (i.e. 6.3 V/mu m). Because the fabrication processes used in this study are standard semiconductor fabrication routes, the study suggests the feasibility of mass producing a nanowire-based FED device. 2011-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/130805 Title: Degradation of raw corn stover powder (RCSP) by an enriched microbial consortium and its community structure Authors: Feng, Yujie; Yu, Yanling; Wang, Xin; Qu, Youpeng; Li, Dongmei; He, Weihua; Kim, Byung Hong Abstract: A microbial consortium with a high cellulolytic activity was enriched to degrade raw corn stover powder (RCSP). This consortium degraded more than 51% of non-sterilized RCSP or 81% of non-sterilized filter paper within 8 days at 40 degrees C under facultative anoxic conditions. Cellulosome-like structures were observed in scanning electron micrographs (SEM) of RCSP degradation residue. The high cellulolytic activity was maintained during 40 subcultures in a medium containing cellulosic substrate. Small ribosomal gene sequence analyses showed the consortium contains uncultured and cultured bacteria with or without cellulolytic activities. Among these bacteria, some are anaerobic others aerobic. Analyses of the culture filtrate showed a typical anoxic polysaccharide fermentation during the culturing process. Reducing sugar concentration increased at early stage followed by various fermentation products that were consumed at the late stage. (C) 2010 Elsevier Ltd. All rights reserved. 2011-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/130804 Title: Microbial fuel cells for energy self-sufficient domestic wastewater treatment-a review and discussion from energetic consideration Authors: Lefebvre, Olivier; Uzabiaga, Arnaud; Chang, In Seop; Kim, Byung-Hong; Ng, How Yong Abstract: As the microbial fuel cell (MFC) technology is getting nearer to practical applications such as wastewater treatment, it is crucial to consider the different aspects that will make this technology viable in the future. In this paper, we provide information about the specifications of an energy self-sufficient MFC system as a basis to extrapolate on the potential benefits and limits of a future MFC-based wastewater treatment plant. We particularly emphasize on the importance of two crucial parameters that characterize an MFC: its electromotive force (E (emf)) and its internal resistance (R (int)). A numerical projection using state-of-art values (E (emf) = 0.8 V and R (int) = 5 Omega) emphasized on the difficulty at this moment to reach self-sufficiency using a reasonable number of MFCs at the laboratory scale. We found that a realistic number of MFCs to provide enough voltage (=5 V) at a sufficient current (=0.8 A) to power a pump requiring 4 W would be of 13 MFCs in series and 10 stacks of MFCs in parallel, resulting in a total number of 130 MFCs. That would result in a treatment capacity of 144 L of domestic wastewater (0.5 g-COD L-1) per day. The total MFC system would be characterized by an internal resistance of 6.5 Omega. 2011-01-01T00:00:00Z