Lee C.-H.,National Kaohsiung University of Applied Sciences
Expert Systems with Applications | Year: 2012
Social networks have been regarded as a timely and cost-effective source of spatio-temporal information for many fields of application. However, while some research groups have successfully developed topic detection methods from the text streams for a while, and even some popular microblogging services such as Twitter did provide information of top trending topics for selection, it is still unable to fully support users for picking up all of the real-time event topics with a comprehensive spatio-temporal viewpoint to satisfy their information needs. This paper aims to investigate how microblogging social networks (i.e. Twitter) can be used as a reliable information source of emerging events by extracting their spatio-temporal features from the messages to enhance event awareness. In this work, we applied a density-based online clustering method for mining microblogging text streams, in order to obtain temporal and geospatial features of real-world events. By analyzing the events detected by our system, the temporal and spatial impacts of the emerging events can be estimated, for achieving the goals of situational awareness and risk management. © 2012 Elsevier Ltd. All rights reserved.
National Kaohsiung University of Applied Sciences | Date: 2014-10-17
A pressure detecting apparatus made by 3D printing technologies being able to be used in dangerous areas is provided. It mainly comprises a light source, a processor, a coupler, and at least one pressure transducer. The pressure transducer comprises a main body and a fiber grating. The fiber grating comprises a fiber Bragg grating sensor, and the fiber grating is fixed on the main body and covers the fiber Bragg grating sensor. When the main body is placed in a fluid area, the fluid would flow through the opening to deform the strain layer and generate a strain variation on the fiber Bragg grating sensor to cause a signal variation in the reflection frequency spectrum. The coupler is configured to couple to the light source and the pressure transducer to decode the signal variation into pressure parameters.
National Kaohsiung University of Applied Sciences | Date: 2014-01-28
A method of making a europium ion doped working electrode, which comprises the following steps: anodizing a Ti foil to obtain an electrode body; dipping the electrode body into an acid solution, which contains 0.035 to 0.045 M of europium ions, followed by thermal treating in a closed system under 100 C. to 180 C. and calcining. Based on the steps above, the fabrication of a working electrode is simplified and the cost is decreased. Also, a europium ion doped working electrode that can enhance the photoelectric conversion efficiency of a back side illuminated TiO_(2)-based DSSC to 153.7 times is obtained.
National Kaohsiung University of Applied Sciences | Date: 2014-08-08
A manufacturing method of a sensor device integrated with ultrasonic transducer and microphone is to form a first support structure, a back plate, a second support structure, a membrane and electrodes on a substrate. The substrate is divided into a first region and a second region. The first electrode, the third electrode, a part of the back plate, a part of the second support structure and a part of the membrane that are above the first region form the ultrasonic transducer. The first support structure, the second electrode, the fourth electrode, a part of the back plate, a part of the second support structure and a part of the membrane that are above the second region form the microphone. The ultrasonic transducer and the microphone are simultaneously manufactured.
National Kaohsiung University of Applied Sciences | Date: 2015-11-27
A bug zapper including a body, a fan and a light source is disclosed. The body has a compartment, an opening, a channel arranged between the compartment and the opening, and a coupling portion arranged between the compartment and the channel. The channel is formed by an enclosed reflection wall and gradually expands from the coupling portion towards the opening. The fan is coupled with the coupling portion. The light source is mounted on a location of the body adjacent to the fan and irradiates light in the channel. As such, the efficiency in attracting the mosquitoes is outstanding and the negative effect to the human is reduced.
National Kaohsiung University of Applied Sciences | Date: 2013-02-22
A process for preparing a solid state electrolyte used in an electrochemical capacitor includes the steps of: (a) preparing a mixture of a water-retaining clay-based mineral component and a film-forming hydroxyl-containing polymer component; (b) subjecting the mixture to a crosslinking reaction so as to form a polymer matrix membrane including a polymer matrix and an ion-permeable film; and (c) treating the polymer matrix membrane with an aqueous solution which includes a plurality of positive and negative ions so as to permit the positive and negative ions to permeate the ion-permeable film to be retained in the polymer matrix, thereby forming the solid state electrolyte.
National Kaohsiung University of Applied Sciences | Date: 2015-09-22
A dye-sensitized solar cell includes a first substrate, a first electrode, a semiconductor layer, a thin photosensitive dye layer, an electrolyte layer, a second electrode and a second substrate. The first electrode is formed on the first substrate as a working electrode, the semiconductor layer is formed on the first electrode and the thin photosensitive dye layer is formed on the semiconductor layer by ultrasound-treating the semiconductor layer which is immersed in a photosensitive dye solution. The second electrode is formed on the second substrate as a counter electrode and the electrolyte layer is disposed between the semiconductor layer and the second electrode.
National Kaohsiung University of Applied Sciences | Date: 2014-12-01
A digital torque wrench mainly comprises a transmission rod of wrench body provided in a handle, and a tool head provided at the exterior of the handle. An abutment surface on the other end of the transmission rod is to abut with one end of a lever arm. A roller is provided on the other end of the lever arm, and a rolling member opposite to the roller is also provided. A latch member on an actuator is inserted between the roller and the rolling member. Further, a controller is coupled with the actuator and a torque sensing element.
National Kaohsiung University of Applied Sciences | Date: 2015-11-16
A fingerprint processing system includes an input unit, a calculation unit and an output unit. The input unit is applied to input an original fingerprint image. The calculation unit is applied to decompose the original fingerprint image to a decomposed image by singular value decomposition (SVD) and the decomposed image is transformed into a plurality of sub-band images by discrete wavelet transformation (DWT) with a template. A plurality of compensation weight coefficients of DWT are calculated to compensate the sub-band images to generate a plurality of compensated sub-band images which are rebuilt by an inverse DWT. After rebuilding the compensated sub-band images, the output unit is applied to output an enhanced fingerprint image.
National Kaohsiung University of Applied Sciences | Date: 2014-10-28
A phosphor material manufacturing method includes: prefabricating a LaPO_(4):Tm^(+) solution or a LaPO_(4):Eu^(+) solution in nitric acid; adding a carbon nano-sized material to the LaPO_(4):Tm^(+) solution or the LaPO_(4):Eu^(3+) solution for mixing to obtain a mixed solution precursors; precipitating the mixed solution and separating a precipitation substance from the mixed solution; drying and grinding the precipitation substance to obtain a powder material; the powder material with a predetermined temperature to form a sintered LaPO_(4):Tm^(+) phosphor material or a sintered LaPO_(4):Eu^(+) phosphor material. Advantageously, the sintered LaPO_(4):Tm^(+) phosphor material or the sintered LaPO_(4):Eu^(+) phosphor material is coated by the carbon nano-sized material for enhancing the efficiency of energy transfer and luminance of the phosphor material.