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DEM interpolation using spectral information
Ji, Jun 대한원격탐사학회 1999 International Symposium on Remote Sensing Vol.15 No.1
Generation of a Digital Elevation Model (DEM) in remote sensing is an important application. The process of DEM generation often requires interpolation. This paper is aimed to introduce a class of interpolation algorithms using spectral information, which is widely used in geophysical applications, and to examine the applicability of the method to DEM interpolation. The interpolation process can be explained in two steps. The first step is for finding spectral information from the known data and the second step is finding missing data so as to follow the spectral trend found in the previous step. The interpolation algorithm has been tested for a real DEM data and problems in the DEM interpolation are discussed.
Synergistic Anti-tumor Effect of KLF4 and Curcumin in Human Gastric Carcinoma Cell Line
Ji, Jun,Wang, He-Shuang,Gao, Yan-Yan,Sang, Li-Min,Zhang, Li Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.18
Kr$\ddot{u}$ppel-like factor 4 is a transcription factor which plays an important role in development and progression of various carcinomas. Curcumin characterized by excellent anti-cancer properties is regarded as a serviceable natural compound used in carcinoma therapy. This study aimed at exploring the impact of KLF4 overexpression in cooperation with curcumin on the proliferation, apoptosis and invasion of human gastric carcinoma BGC-823 cells. Flow cytometry analysis, CCK-8 assays, transwell assays and Western blot results showed that KLF4 overexpression combined with curcumin had significant anti-proliferation, pro-apoptosis and anti-invasion effects on BGC-823 cells. We also found that KLF4 had synergistic effects with curcumin, better promoting apoptosis and inhibiting proliferation and invasion of gastric carcinona cells. These results indicate that KLF4 could be used as a potential therapeutic target; curcumin could act as an auxiliary and provide a promising therapeutic strategy in stomach cancer.
THE COMPUTATION OF POSITIVE SOLUTIONS FOR A BOUNDARY VALUE PROBLEM OF THE LINEAR BEAM EQUATION
Ji, Jun,Yang, Bo Korean Mathematical Society 2017 대한수학회논문집 Vol.32 No.1
In this paper, we propose a method of order two for the computation of positive solutions to a boundary value problem of the linear beam equation. The method is based on the Power method for the eigenvector associated with the dominant eigenvalue and the Crout-like factorization algorithm for the banded system of linear equations. It is extremely fast due to the linear complexity of the linear system solver. Numerical result of a test problem is included.
Jijun Qiu,Dong-Myeong Shin,Weizhen He,김형국,황윤회,Xiaomin Li,Xiangdong Gao 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.9
Axially (c-axis)-oriented ZnO thick films with a 8.1 μm thickness were fabricated on ZnOseed layer coated substrates by using a filtered preheated hydrothermal solution. The thick filmscomposed of single-crystal ZnO microrods with various diameters were formed by coalescing eachnanorod together along their side surfaces. From the X-ray diffraction result a biaxial stress existswas found to exist in the as-grown thick films, and the stress gradually increased with increasingannealing temperatures from 200 to 550 C due to a degradation in the crystalline quality. Thebiaxial stress is responsible for the red-shift of the optical band gap of the ZnO thick films. Photoluminescenceand Hall results revealed that the optical and the electrical properties of the thick filmswere degenerated after high-temperature annealing (> 200 C), which was due to the introductionof point defects, such as oxygen interstitials and zinc vacancies.
The Research based on SSL and WPKI of Mobile E-commerce
Jijun Xing 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.6
The recent years have witnessed the fast growth of mobile e-commerce in the world, and this model has become the most popular one among all the e-commerce models. However, compared with the traditional e-commerce models, the mobile e-commerce is less secure as the carriers, including smart phones, PDA, or handheld computers, can hardly reach the same high level of security as personal computers. The network gap caused by different network operators also causes the network delay when the users are doing cross-platform internet browsing. To solve these problems, a new scheme to reduce network delay and improve security level has been put forward. This scheme proposes to install a “routing box” in user’s home at first. When the smart equipment is to be connected to the Internet, it shall log in on the equipment to be connected to the nearest cloud server which will send the connection request and connect the user to his/her aimed website quickly. Through SSL + WPKI protocol, the user’s log-in information and other forms of information can be safely transmitted. The visiting history can be stored in cache in different levels via cloud server. Therefore, when the relevant information is visited again, the user request can be sent to his/her smart equipment through the nearest cloud server, which can resolve the network gap caused by cross-platform visiting. Such a scheme has been proved effective in local area network by test.
Jijun Yi,Jianhua Rong,Tao Zeng,X. Huang 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.45 No.6
In this paper, a topology optimization method based on the element independent nodal density (EIND) is developed for continuum solids with multiple load cases and multiple constraints. The optimization problem is formulated as minimizing the volume subject to displacement constraints. Nodal densities of the finite element mesh are used as the design variables. The nodal densities are interpolated into any point in the design domain by the Shepard interpolation scheme and the Heaviside function. Without using additional constraints (such as the filtering technique), mesh-independent, checkerboard-free, distinct optimal topology can be obtained. Adopting the rational approximation for material properties (RAMP), the topology optimization procedure is implemented using a solid isotropic material with penalization (SIMP) method and a dual programming optimization algorithm. The computational efficiency is greatly improved by multithread parallel computing with OpenMP to run parallel programs for the shared-memory model of parallel computation. Finally, several examples are presented to demonstrate the effectiveness of the developed techniques.
Study on Remote Wireless Smart Pot System Based on ZIGBEE+MQTT
Jijun Xing 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.5
The home internal wireless network smart pot system is established based on the combination of ZigBee and ESP8266. By uploading the plant growth data collected from the system to cloud server of Internet via MQTT protocol, users are allowed to remotely monitor the growing states of plants in the pots by operating mobile APP to water plants, change environment temperature, increase light intensity and kill weeds and insects. This is a scientific breeding solution with low power consumption, low costs and high efficiency.
Qiu, Jijun,Li, Xiaomin,He, Weizhen,Park, Se-Jeong,Kim, Hyung-Kook,Hwang, Yoon-Hwae,Lee, Jae-Ho,Kim, Yang-Do IOP Pub 2009 Nanotechnology Vol.20 No.15
<P>Well-aligned ultralong ZnO nanorod arrays with a length of 10 µm have been synthesized on glass substrates using a preheating hydrothermal method. The diameter of the nanorods is in the range from 50 to 80 nm, and the aspect ratio and alignment can be simply controlled by varying the preheating time. Based on the evolution of aspect ratio with preheating time, a possible growth mechanism was proposed. X-ray diffraction (XRD) and scanning electron microscopy (SEM) show that the nanostructures are well oriented with the <I>c</I>-axis perpendicular to the substrate. The photoluminescence (PL) spectrum of the as-grown ZnO nanostructure reveals a near-band-edge (NBE) emission peak and a yellow emission, and the origin of yellow emission was confirmed to be from the absorbed hydroxyl group. The ultralong nanorod arrays made in solution have a desirable diameter, length, density and orientation for ordered nanodevice applications. </P>
Qiu, Jijun,Li, Xiaomin,Zhuge, Fuwei,Gan, Xiaoyan,Gao, Xiangdong,He, Weizhen,Park, Se-Jeong,Kim, Hyung-Kook,Hwang, Yoon-Hwae IOP Pub 2010 Nanotechnology Vol.21 No.19
<P>Well-aligned ZnO nanowire arrays with a long length of more than 40 mu m were prepared successfully by using the polyethylenimine (PEI)-assisted preheating hydrothermal method (PAPHT). Several important synthetic parameters such as PEI content, growth time, preheating time and zinc salt concentration were found to determine the growth of ultralong ZnO nanowire arrays, including length, diameter, density and alignment degree. The photoluminescence (PL) spectrum of as-grown ultralong ZnO nanowire arrays revealed a UV emission and a yellow emission, which was attributed to the absorbed hydroxyl group based on the peak shift after annealing in various atmospheres. The performance of dye-sensitized solar cells (DSSCs) increased with increasing length of ZnO nanowire arrays, which was mainly ascribed to the aggrandized photocurrent and reduced recombination loss according to electrochemical impedance spectroscopy (EIS). A maximum efficiency of 1.3% for a cell with a short-circuit current density (J(sc)) = 4.26 mA cm(2), open-circuit voltage (V-oc) = 0.69 V and (fill factor) FF = 0.42 was achieved with a length of 40 mu m.</P>