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Context-specific functional module based drug efficacy prediction
Hwang, Woochang,Choi, Jaejoon,Kwon, Mijin,Lee, Doheon BioMed Central 2016 BMC bioinformatics Vol.17 No.-
<P><B>Background</B></P><P>It is necessary to evaluate the efficacy of individual drugs on patients to realize personalized medicine. Testing drugs on patients in clinical trial is the only way to evaluate the efficacy of drugs. The approach is labour intensive and requires overwhelming costs and a number of experiments. Therefore, preclinical model system has been intensively investigated for predicting the efficacy of drugs. Current computational drug sensitivity prediction approaches use general biological network modules as their prediction features. Therefore, they miss indirect effectors or the effects from tissue-specific interactions.</P><P><B>Results</B></P><P>We developed cell line specific functional modules. Enriched scores of functional modules are utilized as cell line specific features to predict the efficacy of drugs. Cell line specific functional modules are clusters of genes, which have similar biological functions in cell line specific networks. We used linear regression for drug efficacy prediction. We assessed the prediction performance in leave-one-out cross-validation (LOOCV). Our method was compared with elastic net model, which is a popular model for drug efficacy prediction. In addition, we analysed drug sensitivity-associated functions of five drugs - lapatinib, erlotinib, raloxifene, tamoxifen and gefitinib- by our model.</P><P><B>Conclusions</B></P><P>Our model can provide cell line specific drug efficacy prediction and also provide functions which are associated with drug sensitivity. Therefore, we could utilize drug sensitivity associated functions for drug repositioning or for suggesting secondary drugs for overcoming drug resistance.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1186/s12859-016-1078-6) contains supplementary material, which is available to authorized users.</P>
Interference mitigation using random antenna selection in millimeter wave beamforming system
Lim, Woochang,Kwon, Girim,Park, Hyuncheol SpringerOpen 2017 Eurasip Journal on Wireless Communications and Net Vol.2017 No.-
<P>In multi-user beamforming systems, the inter-user interference are controlled by spatial filtering. Since the implementation of digital beamforming is difficult due to high hardware cost of large array system, the analog beamforming system with one phase shifter at each antenna element is considered with antenna selection scheme. However, the beamwidth is not sufficiently narrow to perfectly remove the interference due to limited size of antenna arrays. To mitigate the interference, we propose the random antenna selection system in millimeter wave channel. The random antenna selection expands the effective array size so that the beamwidth becomes narrow. We compare the beamwidth of conventional fixed antenna selection with random antenna selection and analyze the amount of interference for each selection scheme. Theoretical analysis and bit error rate simulation results indicate that the beamforming with random antenna selection can take advantage of large array.</P>
Envelope-PIC Hybrid Method for the Simulation of Microwave Reflectometry
Kang, Teyoun,Kwon, Kyu Been,Cho, Myung-Hoon,Kim, Young-Kuk,Hur, Min Sup,Park, Hyeon K.,Lee, Woochang Institute of Electrical and Electronics Engineers 2018 IEEE transactions on plasma science Vol. No.
<P>We developed a new hybrid method for the simulation of microwave reflectometry, which are commonly used to measure the plasma density and the density fluctuation in magnetically confined plasmas. For the simulation study of reflectometry, they usually solve a full wave equation assuming linear and steady-state response of the plasma. However, the dynamic properties of the plasma can be important near cutoff as the characteristic frequency of the plasma becomes comparable to that of the probe wave. In addition, highly nonlinear behavior is expected to emerge as the density fluctuation develops by numerous types of instability, which can be simulated self-consistently by the particle-in-cell (PIC) method. In our numerical scheme, the full PIC is employed to simulate the cutoff region, while the conventional steady-state dielectric model of the plasma is used for the low-density region. The advantage of the new method is the improved computational speed by at least threefold, while maintaining the overall accuracy of the PIC. The critical point of the new method is minimizing the numerical reflection in the heterogeneous domain.</P>
Study of WSN Management Protocol with Message Aggregation
Dung Vu Anh,DongJun Hwang,WooChang Kwon,JinNyun Kim,YoungWook Cha 한국멀티미디어학회 2010 한국멀티미디어학회 국제학술대회 Vol.2010 No.-
According to the distribution of manager and agent, we reviewed management configurations for the hierarchical WSN (Wireless Sensor Network). Based on the management configurations and .existing management protocols, we defined WSN management protocol with message aggregation mechanism, which could allow cluster head to reduce management traffic to coordinator. We implemented our proposed WSN management protocol in commercial sensor nodes and analyzed the aggregation effect of management messages.
Kim, Minha,Jang, Yong-Jun,Jung, Ho-Sung,Song, Woochang,Kang, Hyunil,Kim, Eung Kwon,Kim, Donguk,Yi, Junsin,Lee, Jaehyeong American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>Aluminum-doped zinc oxide (AZO) thin films were deposited on glass and polyimide substrates using radio frequency magnetron sputtering. We investigated the effects of the oxygen gas ratio on the properties of the AZO films for Cu(In, Ga)Se-2 thin-film solar cell applications. The structural and optical properties of the AZO thin films were measured using X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and UV-Visible-NIR spectrophotometry. The oxygen gas ratio played a crucial role in controlling the optical as well as electrical properties of the films. When oxygen gas was added into the film, the surface AZO thin films became smoother and the grains were enlarged while the preferred orientation changed from (0 0 2) to (1 0 0) plane direction of the hexagonal phase. An improvement in the transmittance of the AZO thin films was achieved with the addition of 2.5-% oxygen gas. The electrical resistivity was highly increased even for a small amount of the oxygen gas addition.</P>