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Cisplatin induced nephrotoxicity is inhibited by Taxilli Ramulus
Lee, Gihyun,Lee, Jun-Ho,Ham, Kyoung Keun,Lee, Hyojung,Kim, Hyunseong,Lee, Hyeonhoon,Hong, Moochang,Shin, Minkyu,Bae, Hyunsu 대한독성유전단백체학회 2012 Molecular & cellular toxicology Vol.10 No.2
Taxilli Ramulus has been shown have antioxidant and anti-inflammatory activities. Cisplatin is the most active cytotoxic anti-cancer drugs. However, the nephrotoxicity of cisplatin limits its use as a therapeutic. In the present study, we examined whether Taxilli Ramulus could protect against cisplatin induced acute renal failure in mice. Taxilli Ramulus were administrated orally once a day for 3 days (150 or 300 mg/kg body wt). After 3 days, all groups of mice received a single dose of cisplatin (25 mg/kg (body wt)) intraperitoneally. Taxilli Ramulus treatment ameliorated renal dysfunction 72 h after cisplatin injection. Taxilli Ramulus treated group had significantly reduced levels of proinflammatory cytokines when compared to the control group. These results show that Taxilli Ramulus is a potent herbal medicine that can reduce cisplatin nephrotoxicity. It also demonstrates that Taxilli Ramulus can prevent the renal toxic effects caused by cisplatin.
수평 진동형 히트파이프에서 충진율이 작동한계에 미치는 영향
이민규(Minkyu Lee),이재민(Jaemin Lee),이상용(Sang Yong Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this present study, the effect of filling ratio on the operation limit of HCLPHP (Horizontal Closed Loop Pulsating Heat Pipe) was investigated experimentally. The HCLPHP was made of stainless steel 316 tube (outer diameter = 1.6 mm, inner diameter = 1.0 mm) which meandered between the cooling and the heating sections with 30 turns (60 channels). R-134a was used as the working fluid and the filling ratio was set to be 40, 50 and 60%. The maximum heat transfer rate at the 40%-filling ratio was higher than other cases (50 and 60%). When the heat input exceeds a certain value which is the operation limit, the evaporator temperature rises as the liquid in the evaporator dries out. At the dryout condition, the increasing rate of the temperature was rapid without any fluctuations for the filling ratio of 40%, but becoming gradual with fluctuations for higher filling ratios.
Ubiscript: A Script Language for Ubiquitous Environment
Minkyu Lee,Dongsoo Han 한국정보과학회 2011 Journal of Computing Science and Engineering Vol.5 No.2
Many distributed and heterogeneous services and devices are accessible in ubiquitous computing environment, so interoperating those services and devices is one of the key tasks in implementing ubiquitous applications. We used to use script languages in integrating such interoperating components and services. However currently available most script languages are not suitable for ubiquitous environment because there are so diverse forms of interoperation targets such as service objects, web, legacy objects and programmable devices. So it is worthwhile designing a new script language well-suited to ubiquitous environment. In this paper, we propose a new script language, called Ubiscript, for the ubiquitous environment. We develop and adopt several unique language features such as remote scope, multiple contexts, web and legacy objects, remote exception handling, etc. in Ubiscript to overcome the limitations of conventional script languages. In this paper, we also describe the implementation of Ubiscript and its runtime system. A couple of ubiquitous applications were developed in Ubiscript, and the applications are tested on the runtime system. According to our experiences and evaluation, Ubiscript turned out to have a high potential in its expression power and contribution to improving ubiquitous application developers’ productivity.
An Efficient Face Recognition using Feature Filter and Subspace Projection Method
Lee, Minkyu,Choi, Jaesung,Lee, Sangyoun International Society for Simulation Surgery 2015 Journal of International Society for Simulation Su Vol.2 No.2
Purpose : In this paper we proposed cascade feature filter and projection method for rapid human face recognition for the large-scale high-dimensional face database. Materials and Methods : The relevant features are selected from the large feature set using Fast Correlation-Based Filter method. After feature selection, project them into discriminant using Principal Component Analysis or Linear Discriminant Analysis. Their cascade method reduces the time-complexity without significant degradation of the performance. Results : In our experiments, the ORL database and the extended Yale face database b were used for evaluation. On the ORL database, the processing time was approximately 30-times faster than typical approach with recognition rate 94.22% and on the extended Yale face database b, the processing time was approximately 300-times faster than typical approach with recognition rate 98.74 %. Conclusion : The recognition rate and time-complexity of the proposed method is suitable for real-time face recognition system on the large-scale high-dimensional face database.
A 45 nm 9-bit 1 GS/s High Precision CMOS Folding A/D Converter with an Odd Number of Folding Blocks
Lee, Seongjoo,Lee, Jangwoo,Song, Minkyu The Institute of Electronics and Information Engin 2014 Journal of semiconductor technology and science Vol.14 No.4
In this paper, a 9-bit 1GS/s high precision folding A/D converter with a 45 nm CMOS technology is proposed. In order to improve the asymmetrical boundary condition error of a conventional folding ADC, a novel scheme with an odd number of folding blocks is proposed. Further, a new digital encoding technique is described to implement the odd number of folding technique. The proposed ADC employs a digital error correction circuit to minimize device mismatch and external noise. The chip has been fabricated with 1.1V 45nm Samsung CMOS technology. The effective chip area is $2.99mm^2$ and the power dissipation is about 120 mW. The measured result of SNDR is 45.35 dB, when the input frequency is 150 MHz at the sampling frequency of 1 GHz. The measured INL is within +7 LSB/-3 LSB and DNL is within +1.5 LSB/-1 LSB.
Lee, Jun Seop,Kim, Minkyu,Lee, Choonghyeon,Cho, Sunghun,Oh, Jungkyun,Jang, Jyongsik RSC Pub 2015 Nanoscale Vol.7 No.8
<P>With recent developments in technology, tremendous effort has been devoted to producing materials for flexible device systems. As a promising approach, solution-processed conducting polymers (CPs) have been extensively studied owing to their facile synthesis, high electrical conductivity, and various morphologies with diverse substrates. Here, we report the demonstration of platinum decorated reduced graphene oxide intercalated polyanililne:poly(4-styrenesulfonate) (Pt_rGO/PANI:PSS) hybrid paste for flexible electric devices. First, platinum decorated reduced graphene oxide (Pt_rGO) was fabricated through the chemical reduction of platinum cations and subsequent heat reduction of GO sheets. Then, the Pt_rGO was mixed with PANI:PSS solution dispersed in diethylene glycol (DEG) using sonication to form a hybrid PANI-based paste (Pt_rGO/PANI:PSS). The Pt_rGO/PANI:PSS was printed as a micropattern and exhibited high electrical conductivity (245.3 S cm(-1)) with flexible stability. Moreover, it was used in a dipole tag antenna application, where it displayed 0.15 GHz bandwidth and high transmitted power efficiency (99.6%).</P>
A rapid performance diagnosis of seawater reverse osmosis membranes: simulation approach
Lee, Young Geun,Kim, Do Yeon,Kim, Yu Chang,Lee, Yun Seok,Jung, Da Hee,Park, Minkyu,Park, Sang-Jin,Lee, Sangho,Yang, Dae Ryook,Kim, Joon Ha Informa UK (Taylor Francis) 2010 Desalination and Water Treatment Vol.15 No.1
Enhanced Haze Ratio on Glass by Novel Vapor Texturing Method
Lee, Seunghwan,Balaji, Nagarajan,Ju, Minkyu,Park, Cheolmin,Kim, Jungmo,Chung, Sungyoun,Lee, Youn-Jung,Yi, Junsin American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>State-of-the-art optical trapping designs are required to enhance the light trapping capabilities of tandem thin film silicon solar cells. The wet etch process is used to texture the glass surface by dipping in diluted acidic solutions such as HNO3 (nitric acid) and HF (hydrofluoric acid). For vapor texturing, the vapor was generated by adding silicon to HF:HNO3 acidic solution. The anisotropic etching of vapor textured wafers resulted in an etching depth of about 2.78 mu m with reduced reflectance of 5%. We achieved a high haze value of 74.6% at a 540 nm wavelength by increasing the etching time and HF concentration.</P>
The diffusion of mobile telecommunications services in Korea
Lee, Minkyu,Cho, Youngsang Routledge 2007 Applied Economics Letters Vol.14 No.7
<P> This study investigates the diffusion of mobile telecommunications in Korea. The aim is to compare the performance of logistic model of diffusion with that of a time series autoregressive moving average model and to identify factors that determine the diffusion adoption process. Empirical results are based on annual data on cellular mobile subscribers covering 1984 to 2002. Results suggest that, the diffusion speed increases with per capita GDP, but it decreases with the number of main telephone lines in operation.</P>