Kuan-Ming Li's research while affiliated with National Taiwan University and other places
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Publications (54)
Insufficient data is always a challenge for developing an accurate machine learning or deep learning model in manufacturing processes, especially in tool wear monitoring under varied cutting conditions. This paper presents a Random Forest model for predicting tool wear under varied cutting conditions as well as studies extracted signal features. Th...
Over recent years, with the advances in image recognition technology for deep learning, researchers have devoted continued efforts toward importing anomaly detection technology into the production line of automatic optical detection. Although unsupervised learning helps overcome the high costs associated with labeling, the accuracy of anomaly detec...
![Classification of drill hole methods [6–8]](publication/365320830/figure/fig1/AS:11431281098395938@1668912717474/Classification-of-drill-hole-methods-6-8_Q320.jpg)
In the era of the Internet of Things, the demand for sensors—including those used in wearable devices, those used in smart machinery, electronic sensors for vehicles, and gas sensors—is steadily increasing. To improve the performance of sensing components, stacking circuits and packaging materials can be used as the heterogeneous chips in manufactu...
In the era of the Internet of Things, the demand for sensors—including those used in wearable devices, those used in smart machinery, electronic sensors for vehicles, and gas sensors—is steadily increasing. To improve the performance of sensing components, stacking circuits and packaging materials can be used as the heterogeneous chips in manufactu...
Electrochromic devices (ECDs) are a promising material for smart windows that are capable of transmittance variation. However, ECDs are still too expensive to achieve a wide market reach. Reducing fabrication cost remains a challenge. In this study, we inserted an IrO2 buffer layer on Ti-doped V2O5 (Ti:V2O5) as a counter electrode using various Ar/...
In this study, nickel oxide (NiO) thin films were printed by an aerosol jet printer, which is capable of fabricating thin films on the curve substrate via air stream. To approach high efficiency fabricating thin film thermistors in small batch sizes, the printed NiO nanoparticle thin films were sintered by using a 355 nm wavelength ultraviolet (UV)...
The nanosecond pulsed ultraviolet laser to modify the graphene composite materials (rGO/ZnO) and improve gas sensing response. The electrical resistance decreased from 2.72 × 103 to 1.13 × 103 Ω/square. The XPS results revealed that the ratio of oxygen to carbon atoms decreased from 33.73 to 12.59%. The bonding structure indicated that the ratio of...
This paper presents the design and implementation of fuzzy logic control for human walking using lab-developed sensors and the second lower limb robotic exoskeleton (LLRE-II) to detect gait phases. A piezoresistive tactile sensor (PRTS) was developed and used to measure the foot pressure to predict human walking behavior. The proposed sensor with g...
In this study, we developed a bending moment model that considers the cutting forces acting on a sensory tool holder along the rotational direction. The polar plot of the bending moment during cutting can be used to investigate the cutting behavior. Cutting processes with different cutting depths and widths result in different polar plots, as verif...
In metal cutting, how to measure the tool tip temperature is always an issue. The highest temperature occurs at the contact surface between the tool and the chip, which is difficult for non-contact measuring methods such as the infrared thermal imaging technique. For other measuring methods, such as thermocouples, an additional small hole is requir...
This study discussed the ablation thresholds of picosecond laser dual pulses in fused silica with different temporal separations. The results indicate that the lowest damage threshold of the dual-pulse ablation is at a temporal separation of 100 ps, which is only half of the threshold of the conventional pulse ablation. Furthermore, the energy rati...
This paper presented the mechanical design and control of a lower limb rehabilitation exoskeleton named “the second lower limb rehabilitation exoskeleton (LLRE-II)”. The exoskeleton with a lightweight mechanism comprises a 16-cm stepless adjustable thigh and calf rod. The LLRE-II weighs less than 16 kg and has four degrees of freedom on each leg, i...
In this study, the ultraviolet (UV) radiation curing process and furnace curing process for curing aerosol jet printed nickel oxide (NiO) nanoparticle thin films were investigated. NiO has a negative temperature coefficient and can be used to fabricate temperature sensors. Four UV power settings (for 10 min) and four furnace temperatures (for 1 h)...
The deep learning technique has turned into a mature technique. In addition, many researchers have applied deep learning methods to classify products into defective categories. However, due to the limitations of the devices, the images from factories cannot be trained and inferenced in real-time. As a result, the AI technology could not be widely i...
Flank wear is the most common wear that happens in the end milling process. However, the process of detecting the flank wear is cumbersome. To achieve comprehensively automatic detecting the flank wear area of the spiral end milling cutter, this study proposed a novel flank wear detection method of combining the template matching and deep learning...
In this study, ultraviolet (UV) radiation curing process and furnace curing process for curing aerosol jet printed nickel oxide (NiO) nanoparticle thin films were investigated. NiO has a negative temperature coefficient and can be used to fabricate temperature sensors. Four UV power settings (for 10 minutes) and four furnace temperatures (for one h...
In complementary electrochromic devices (ECDs), nickel oxide (NiO) is generally used as a counter electrode material for enhancing the coloration efficiency. However, an NiO film as a counter electrode in ECDs is susceptible to degradation upon prolonged electrochemical cycling, which leads to an insufficient device lifetime. In this study, a type...
This letter presents a study of thermal memory effect reduction for pulse-modulated polar transmitters (PMPTs). PMPTs using pulse modulation have shown very low memory effects even when operated at high-power levels in the previous literature. In this letter, thermal simulations were performed to study the effects of pulse modulation. The simulatio...
![Table 1 . The four different turning types inserts [4].](publication/321665421/figure/tbl1/AS:667627315793930@1536186164292/The-four-different-turning-types-inserts-4_Q320.jpg)
In this study, a miniaturized thermistor sensor was produced using the Aerosol Jet printing process for temperature sensing applications. A nickel oxide nanoparticle ink with a large temperature coefficient of resistance was fabricated. The thermistor was printed with a circular NiO thin film in between the two parallel silver conductive tracks on...
In this study, a laser power monitoring and stabilizing system for micro-hole drilling based on optical outputs of a CMOS sensor is presented. The correlation between the laser power and the average brightness of the beam spots on the images was investigated. The estimated laser power was used to build an on-line closed loop control of micro-hole d...
Since the laser was invented, laser has been applied in many fields such as material processing, communication, measurement, biomedical engineering, defense industries and etc. Laser power is an important parameter in laser material processing, i.e. laser cutting, and laser drilling. However, the laser power is easily affected by the environment te...
Achieving excellent quality of micromilled surfaces usually requires additional efforts and cost, and Taguchi methodology is an efficient tool in the parameter optimization process. The aim of this study is to explore the optimal cutting parameters for minimal surface roughness of a micromilled brass mold inset, and the controlling parameters inclu...
Aluminum nitride (AlN) and aluminum oxide (Al2O3) ceramic light emitting diode (LED) sub-mounts are the most widely used package substrate for recently-developed high-brightness (HB) LED package applications because they exhibit superior thermal conductivity compared to conventional printed circuit board (PCB) package substrates. Nonetheless, the A...
Rapidly prototyping a polymer microfluidic device is a growing interest in the application fields of the disease detection, drug synthesis, and the environmental monitoring because of the benefits of the miniaturized platforms. Micromilling is one of the micromachining methods and it has been commonly used to manufacture polymer microfluidic device...
Rapidly prototyping a polymer microfluidic device is a growing interest for various applications and micromilling is one of the common approaches to manufacture polymer microfluidic devices. The advantages of using micromilling for polymer microfluidic devices include shorter fabrication process, lower cost, easier user interface, and being capable...
This paper presents an improved remote thermocouple sensing technique for estimating cutting temperatures in a turning operation. The improved model can be used to monitor the transient cutting temperature in turning. The heat flux is estimated based on the measured remote temperature. Neither cutting forces nor heat partition factors are required...
This article presents an experimental study on how tool wear affects tool life, surface roughness, and burr formation in ultrasonic vibration-assisted micro-milling. Small amplitude of vibration (2 mm) is applied to the micro-tools to evaluate the cutting performance influenced by tool flank wear as the cutting lengths increase. Compared to convent...
This study investigated the feasibility of conventional nanosecond (ns) laser drilling strategy and a new hybrid ns laser drilling strategy for the formation of through-silicon via (TSV), adopted in light-emitting-diode (LED) sub-mount application. In this research work, the most widely known technique, namely, the voltage ramp, was applied to meas...
Through-silicon via (TSV) is an emerging technology for three-dimensional integrated circuit, system in package, and wafer level packaging applications. In this study, a wet chemical etching (WCE) process has been employed to enhance the sidewall quality of TSVs fabricated using nanosecond (ns) laser pulses. Experimental results show that the TSV s...
This paper presents experimental studies of vibration-assisted grinding with small-amplitude vibration (in the order of 1 mu m) in terms of ground surface finish and tool life. The objectives are to obtain finer surface finishes on molds and longer tool life. The investigation shows that vibration-assisted grinding can improve surface finishes when...
Through-silicon vias (TSVs) are thought to be the essential process of the next-generation packaging technologies such as three-dimensional integrated circuit, system in package and wafer-level packaging. This Letter investigated the formation quality of deep TSVs using green nanosecond laser drilling process. Moreover, a wet chemical etching (WCE)...
This paper presents a pulsed-biasing strain gauge measurement system for wireless sensing applications. The use of pulsed-biasing on the strain gauge can reduce the power consumption of the sensor, which is crucial for low-power wireless sensors. Moreover, without using a constant bias current, power dissipated on the resistive bridge that includes...
AL-FEC (Application-Layer FEC) is already in used for protecting streaming and file delivery services against packet losses in the field of wide-area multimedia broadcasting, such as in DVB-H and 3GPP MBMS (Multimedia Broadcast Multicast Service) mobile TV systems. However, it is still not a well-studied approach for applying AL-FEC to WiFi multica...
The objective of this paper is to present a methodology to analytically model the tool flank wear rate in near dry turning under built-up edge (BUE) effect. It involves the analysis of cutting forces, cutting temperatures and tool wear modes of abrasion, adhesion, and diffusion. The BUE formation is also considered in the view of the dynamic strain...
For improving the service quality of the Taiwan High-Speed Rail (THSR), a dedicated mobile WiMAX network (based on IEEE 802.16e in the current stage) is planned to be deployed along the railway of THSR. The mobile WiMAX network is not only for providing Internet access over the THSR trains, but also for delivering live entertainment contents to the...
Dry machining is considered as a green manufacturing process because the use of cutting fluids has concerns about environmental contamination and health hazards. However, in grinding, the use of cutting fluids is a common strategy to improve the cutting performance and the product surface finish due to the transportation of heat away from the cutti...
This paper discusses the performance of the minimum quantity lubrication (MQL) in micro-grinding based on ground surface roughness and tool life. The effects of grinding and lubricating parameters on machining performance are studied. Experiments for dry grinding and grinding with pure air are also conducted for comparison. It is observed that surf...
The recent IP-based mobile TV standards, such as DVB-IPDC and OMA BCAST, employ both unidirectional broadcast networks and mobile interactive networks for hybrid service delivery. For these mobile TV standards, the performance of the file delivery protocol over broadcast channels (i.e., the IETF FLUTE protocol) is well studied in the literature. Ho...
Vehicular wireless communication for real-time or emergent events notification is an important issue in VANETs. In this article we construct an integrated architecture for the implementation of dynamic routing/navigation application in VANET environment using iWCU®- a WAVE/DSRC device developed by ITRI1 of Taiwan. The Dynamic navigation field test...
FLUTE is a file delivery protocol whose operation can only require a unidirectional communication channel from a sender to a receiver. Due to the nature of unidirectional delivery, FLUTE is designed in a flexible way so that it can cooperate with different kinds of forward error correction codes in application layer, such as systematic Raptor codes...
This paper presents the performance of the minimum quantity lubrication (MQL) technique in near micro-milling with respect to dry cutting on the basis of tool wear, surface roughness and burr formation. The effects of tool materials, oil flow rate and air flow rate on tool performance in MQL cutting are also studied. It is found that the applicatio...
TPEG is a standard which specify the traffic and travel information. This paper applies a fountain coding mechanism to DSMCC that speed up TPEG XML reception time in transmission signal unstable regions. Sometimes the broadcaster encodes TPEG services as XML format and transmitting XML based TPEG services on unidirectional data carousel transportat...
Micro-milling is a suitable technique for manufacturing of microstructures with high aspect ratios and intricate geometries. The application of the micro-milling process in cutting hardened tool steel is particularly challenging. The low strength of the miniaturized end mills implies accurate control of the chip load in order to prevent the tool br...
This study develops the analytical understanding of mechanical and environmental effects of minimum quantity lubrication (MQL)
in machining and profiles the MQL performance as functions of machining and fluid application parameters. Physics-based predictive
models are formulated to quantitatively describe the resulting contact stress and temperatur...
A predictive model for the cutting forces in near dry machining, in which only a small amount of cutting fluid is used, is developed based on considerations of both the lubricating effect and the cooling effect. For the lubricating effect, with the material properties, lubricating parameters, and cutting conditions, the friction coefficient in near...
The objective of this paper is to present physical and quantitative models for the rate of tool flank wear in turning under flood cooling conditions. The resulting models can serve as a basis to predict tool life and to plan for optimal machining process parameters. Analytical models including cutting force analysis, cutting temperature prediction,...
Near dry machining refers to the condition of applying cutting fluid at relatively low flow rates, on the order of 2-100 ml/h, as opposed to the conventional way of using either a large quantity, typically of about 10 1/min, as in wet machining; or no fluid at all, as in dry machining. One important expectation of applying fluids is to control the...
The generation of aerosol using the cutting fluids in machining processes presents a concern from the standpoint of pollution to the environment. Near-dry machining, as a method of applying only a minute amount of cutting fluid, has been developed to address the air quality issue. This paper presents the establishment of an analytical method to qua...
The objective of this paper is to present a methodology to analytically model the tool flank wear rate in near-dry turning. The resulting models can serve as a basis to minimize time-consuming machining tests in predicting tool life. Analytical models, including cutting force model, cutting temperature model, and tool wear model, are presented. The...
The objective of this study is to develop a methodology to analyze the air quality and tool performance in turning process under near-dry condition. Near dry machining refers to the use of a very small amount of cutting fluid in the machining process. In order to implement the near dry machining technology, this dissertation develops the analytical...
Citations
... In this formulation, models are only trained on normal samples, learning to describe their distribution, using the premise that it is possible to detect anomalies based on how well the learned model can describe a given sample-i.e., samples containing anomalies are not well described by the model, and will appear as outliers. Many recent studies aimed at industrial inspection in various settings explore this idea [1,2,[13][14][15][16][17][18][19][20]. ...
... Xu and Cheng [2] studied Co3O4 as gas sensor materials for enhance the high response and sensing gas at low-operating temperature. Hsieh et al. [3] used the graphene composite material film (rGO/ ZnO = 10/1) combined with laser-induced surface modification technology to improve gas-sensing response. ...
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... However, this results in a heavy actuation system and low overall efficiency [2]. A common method to obtain a compact and relatively efficient drivetrain is by combining a smaller electric motor with a gear reduction system to reduce the motor torque requirement [3][4][5][6][7]. This is the most commonly used topology and therefore the reference topology of this study. ...
... Computer numerical control machines are operated with programmed commands and are widely used for manufacturing process these days, allowing complex-shaped machines to be produced. Many of the components or products which can not be produced by human-handling machines are used with certain types of sensors that are more beneficial to manufacturers [29,30]. In contrast to global competitors, almost every producer in a worldwide marketplace seeks to improve product quality and manufacturing productivity and also tries to eliminate production waste and human inspections and reduce overall costs of machining [14,31,32]. ...
... Li et al. [11] established an automatic tool wear image detection system to segment the wear images by finding the optimal threshold value through maximum inter-class variance and iteration, and counted the wear interval pixels to calculate the tool wear quantization value. Lin et al. [12] used machine vision and machine learning based methods to segment and identify tool wear areas and have achieved detection of tool wear status. ...
... Numerous techniques such as hydrothermal [36], sol-gel [37], co-precipitation [38], thermal combustion [39], electrospinning [3,40], ball milling [41], pulse ablation [42], aerosol [43], flame pyrolysis [44], molten salt protected pyrolysis [45,46], have been explored for the synthesis of a variety of NiO morphologies. In the present study, the co-precipitation method, which provides control over shape, dimensionality, and size with high yield, has been opted to tailor the 0D and i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y x x x ( x x x x ) x x x 2D morphologies of NiO. ...
... Cathodic arcs can be used for the reactive deposition of various nitrides and oxides. This can largely be overcome by steering the arc rapidly across the surface of the cathode under high working pressure to reduce the spot residence time and limit the formation of erosion craters [7,38]. In recent years, researchers have shifted the emphasis from monolithic coatings to higher performing multilayers and nanocomposites. ...
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... Benefiting from the high-power density and process yield, GaAs heterojunction bipolar transistor (HBT) process becomes the most promising candidate of power amplifiers (PAs) for mobile terminals [1][2][3][4]. With the growth of frequency and integration of sub-6G technology, requirements in thermal stability and electrical-parameter accuracy on PAs keep increasing to guarantee high performance [5][6][7], making it very challenging for the GaAs HBT PAs. First of all, comparing the temperature characteristics of Si, GaAs and GaN, the thermal conductivity of GaAs is the worst. ...
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... The gold electrodes were also used for temperature and humidity sensing, with temperatures and humidity sensitivities of 4.81 × 10 −3 /°C and 0.03 pF/ percent RH, respectively [27]. A metal oxide thermistor with a wide temperature sensing range was also constructed and evaluated using an aerosol jet [28]. Among these materials, Silver is the most extensively used of these materials in RTD temperature sensing applications. ...
... Franco et al. [38] studied the energy consumption of micro-drilling processes and performed a comparative analysis between micro-EDM and ultrashort pulse laser drilling. Ding et al. [39] presented a power monitoring and stabilizing system for the micro-drilling process. Nguyen et al. [40] optimized varied parameters of the EDM drilling process of SS304 for energy efficiency, product quality, and productivity. ...
