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Design and Analysis of the Eddy Current Brake with the Winding Change
Sooyoung Cho,Huai-Cong Liu,Ju Lee,Chang-Moo Lee,Sung-Chul Go,Sang-Hwan Ham,Jong-Hyuk Woo,Hyung-Woo Lee 한국자기학회 2017 Journal of Magnetics Vol.22 No.1
This paper is a study of the eddy current brake designed to replace the air brake of railway application. The eddy current brake has the advantage of being able to take a high current density compared to the other application because this brake is used for applying brakes to the rolling stock for a shorter amount of time. Also, this braking system has the merit of being able to take a high current density at low speed rather than at high speed, because the heat generated by the low speed operation is less than that of the high speed operation. This paper also presents a method of improving the output torque of the eddy current brake at low speed operation through a change of the winding as well as the basic design.
Jin, Zhen,Nguyen, Kim Tien,Go, Gwangjun,Kang, Byungjeon,Min, Hyun-Ki,Kim, Seok-Jae,Kim, Yun,Li, Hao,Kim, Chang-Sei,Lee, Seonmin,Park, Sukho,Kim, Kyu-Pyo,Huh, Kang Moo,Song, Jihwan,Park, Jong-Oh,Choi, American Chemical Society 2019 NANO LETTERS Vol.19 No.12
<P>Nanorobots are safe and exhibit powerful functionalities, including delivery, therapy, and diagnosis. Therefore, they are in high demand for the development of new cancer therapies. Although many studies have contributed to the progressive development of the nanorobot system for anticancer drug delivery, these systems still face some critical limitations, such as potentially toxic materials in the nanorobots, unreasonable sizes for passive targeting, and the lack of several essential functions of the nanorobot for anticancer drug delivery including sensing, active targeting, controlling drug release, and sufficient drug loading capacity. Here, we developed a multifunctional nanorobot system capable of precise magnetic control, sufficient drug loading for chemotherapy, light-triggered controlled drug release, light absorption for photothermal therapy, enhanced magnetic resonance imaging, and tumor sensing. The developed nanorobot system exhibits an <I>in vitro</I> synergetic antitumor effect of photothermal therapy and chemotherapy and outstanding tumor-targeting efficiency in both <I>in vitro</I> and <I>in vivo</I> environments. The results of this study encourage further explorations of an efficient active drug delivery system for cancer treatment and the development of nanorobot systems for other biomedical applications.</P> [FIG OMISSION]</BR>
Kim, Dae-Sik,Park, Ho-Bum,Lee, Chang-Hyun,Lee, Young-Moo,Moon, Go-Young,Nam, Sang-Yong,Hwang, Ho-Sang,Yun, Tae-II,Rhim, Ji-Won The Polymer Society of Korea 2005 Macromolecular Research Vol.13 No.4
Crosslinked poly(vinyl alcohol) (PVA) membranes were prepared at various crosslinking temperatures using poly(acrylic acid-co-maleic acid) (PAM) containing different PAM contents. The thermal properties of these PVA/PAM membranes prepared at various reaction temperatures were characterized using differential scanning calorimetry (DSC). The proton conductivity and methanol permeability of PVA/PAM membranes were then investigated as PAM content was varied from 3 to 13 wt%. It was found that the proton and methanol transport were dependent on PAM content in their function both as crosslinking agent and as donor of hydrophilic -COOH groups. Both these properties decreased monotonously with increasing PAM concentration. The proton conductivities of these PVA/PAM membranes were in the range from $10^{-3}\;to\;10^{-2}S/cm$ and the methanol permeabilities from $10^{-7}\;to\;10^{-6}cm^{2}/sec$. In addition, the effect of operating temperature up to $80^{\circ}C$ on ion conductivity was examined for three selected membranes: 7, 9 and 11 wt% PAM membranes. Ion conductivity increased with increasing operating temperature and showed and S/cm at $80^{\circ}C$, respectively. The effects of crosslinking and ionomer group concentration were also examined in terms of water content, ion exchange capacity (IEC), and fixed ion concentration. In addition, the number of water molecules per ionomer site was calculated using both water contents and IEC values. With overall consideration for all the properties measured in this study, $7{\sim}9\;wt%$ PAM membrane prepared at $140^{\circ}C$ exhibited the best performance. These characteristics of PVA/PAM membranes are desirable in applications related to the direct methanol fuel cell (DMFC).
Removal of phenol from gas streams via combined plasma catalysis
Kuan Lun Pan,Dai Ling Chen,Guan Ting Pan,Siewhui Chong,Moo Been Chang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-
A hybrid system consisting of non-thermal plasma and perovskite-like catalyst is developed andevaluated for the effectiveness in removing phenol from gas streams. For thermal catalysis,La0.8Sr0.2Mn0.8Cu0.2O3 shows high activity for phenol removal. Further, La0.8Sr0.2Mn0.8Cu0.2O3 is appliedfor combined plasma catalysis (CPC). The results indicate that phenol removal efficiency with CPCremains 100% at applied voltage range of 13–16 kV. Importantly, secondary pollutants (O3 and NOx) andenergy efficiency can be inhibited and increased, respectively, as CPC is applied. Overall, this studydemonstrates that combining non-thermal plasma with perovskite-like catalyst is effective in removingphenol from gas streams.
최윤호(Yun-Ho Choi),변주형(Joo-Hyeong Byun),원종무(Jong-Moo Won),김종성(Jong-Sung Kim),신종현(Jong-Hyun Shin),유창숙(Chang-Suk You),정윤하(Yun-Ha Jeong),박민빈(Min-Been Park),오조교(Jo-Gyo Oh) 한국환경보건학회 2020 한국환경보건학회지 Vol.46 No.6
Objectives: The main purpose of this study is to evaluate heavy metal concentrations (Cd, As, Hg, Pb, Cr6+), particle size distribution, hydrochloric acid solubility, and parasite eggs in sand in five non-designated sandy beaches in Gyeonggi Province. Methods: The sampling sites are five non-designated Gyeonggi-do sandy beaches located in Ansan and Hwaseong. ICP-OES and UV, a Vibratory Sieve Shaker, and PCM were respectively used to analyze heavy metal concentrations, particle size distribution, and parasite eggs in the sand. Results: Heavy metals were detected within the beach s safety management standards and some of the detected As and Pb before and after beach opening were lower than one-quarter of the average value. In addition, the results of the T-test to confirm the As and Pb concentration changes before and after opening showed a significant difference in some beaches. The composition of sand was 86.53% according to the particle size distribution standard (2.0-0.02 mm), and the hydrochloric acid solubility was the highest at Gubongsolsup (4.9%) and the lowest at Bangameo-li (0.2%). Parasite eggs were undetected in all beach sand before and after opening. Conclusions: The safety of heavy metal concentrations in sandy beaches was secured in the selected five beaches in Gyeonggi Province. However, continuous efforts are required to make Gyeonggi-do’s beaches suitable according to the Act on the Use and Management of Beaches.