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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
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Journal DOI :
Korean Society of Precision Engineering
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Volume & Issues
Volume 33, Issue 9 - Sep 2016
Volume 33, Issue 8 - Aug 2016
Volume 33, Issue 7 - Jul 2016
Volume 33, Issue 6 - Jun 2016
Volume 33, Issue 5 - May 2016
Volume 33, Issue 4 - Apr 2016
Volume 33, Issue 3 - Mar 2016
Volume 33, Issue 2 - Feb 2016
Volume 33, Issue 1 - Jan 2016
Selecting the target year
Study of Optimal Process Conditions of 3D Porous Polymer Printing for Personal Safety Products
Yoo, Chan-Ju ; Kim, Hyesu ; Park, Jun-Han ; Yun, Dan-Hee ; Shin, Jong-Kuk ; Shin, Bo-Sung ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 333~339
DOI : 10.7736/KSPE.2016.33.5.333
In this paper, a fundamental experiment regarding the formation of porous 3D structures for personal safety products using 3D PPP (Porous Polymer Printing) was introduced for the first time. The filament was manufactured by mixing PP (Polypropylene) and CBA (Chemical Blowing Agent) with polymer extruder, and the diameter of the filament was approximately 1.75mm. The proposed 3D PPP method, combined with the conventional FDM (Fused Deposition Modeling) procedure, was influenced by process parameters, such as the nozzle temperature, printing speed and CBA density. In order to verify the best processing conditions, the depositing parameters were experimentally investigated for the porous polymer structure. These results provide parameters under which to form a multiple of 3D porous polymer structures, as well as various other 3D structures, and help to improve the mechanical shock absorption for personal safety products.
Prototype Manufacturing Using 3D Printing and Characteristics of Flow Rate and Dynamics for High Temperature Solenoid Valve
Yi, Hyung Wook ; Lee, Yong Moon ; Shin, Bo Sung ; Lee, Tae Gu ; Kang, Myung Chang ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 341~348
DOI : 10.7736/KSPE.2016.33.5.341
The solenoid valve is used widely across various industries; however, solenoid valves for use in high-temperature environments have to be highly specified, such as those used in thermal power plants and steel mills. As such, we have developed a solenoid valve, using an already developed solenoid, to allow for more specific use. In this type of development method, use of 3D printing is very effective, allowing for a reduction in errors in design and production. This study includes a mathematical model of the solenoid valve. Then, the simulation from the mathematical model was performed using the AMESim (Advanced Modeling Environment for Simulation of Engineering Systems). We made a prototype valve using the simulation results and also measured the flow rate and dynamic performance.
Effects of Convergence Firefighter Helmet Attributes on Consumer Response
Oh, Mi-Ok ; Shin, Jong-Kuk ; Kang, Myung-Chang ; Shin, Bo-Sung ; Moon, Min-Kyung ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 349~356
DOI : 10.7736/KSPE.2016.33.5.349
This study investigates the effects of convergence firefighter helmet attributes on consumer attitude toward the product and willingness-to-pay. The results of empirical analysis are as follows. First, consumer attitude toward the convergence product is more favorable when conciseness, economical efficiency, and the utility value of the convergence product`s attributes are high, while consumer attitude toward the convergence product is less favorable when the perceived risk of the convergence product`s attributes is high. Second, consumer willingness-to-pay for the convergence product is higher when conciseness, economical efficiency, and the utility value of the convergence product`s attributes are high, while consumer willingness-to-pay for the convergence product is lower when the perceived risk of the convergence product`s attributes is high. Based on our results, the implications are discussed for the further development of convergence products.
Design of Bio-Inspired Morpho Butterfly Structures for Optical Sensor Applications
Kim, Hyeon Myeong ; Lee, Gil Ju ; Kim, Min Seok ; Kim, Kyu Jung ; Song, Young Min ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 357~362
DOI : 10.7736/KSPE.2016.33.5.357
Various species of insects display vivid colors, widely known as `structural color` due to their optical interference. Morpho butterflies are famous for their brilliant iridescent colors, which arise from the photonic-nanostructures of optical interference on their wings. In this paper, we outline the results of a comparative study of the optical properties of bio-inspired Morpho butterfly structures with the widely known Distributed Bragg Reflector (DBR), conducted using a rigorous coupled-wave analysis (RCWA) method for the two structures. Almost analogous tendencies were observed for both Morpho and DBR structures. With variation in the surrounding media, however, Morpho structures showed an obvious peak shift while no significant changes were observed in DBR, which can be applicable.
Estimation of Sensitivity Enhancements of Material-Dependent Localized Surface Plasmon Resonance Sensor Using Nanowire Patterns
Ahn, Heesang ; Ahn, Dong-Gyu ; Song, Yung Min ; Kim, Kyujung ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 363~369
DOI : 10.7736/KSPE.2016.33.5.363
We explored localized plasmonic field enhancements using nanowire patterns to improve the sensitivity of a surface plasmon resonance (SPR) sensor. Two different materials, gold and silver, were considered for sample materials. Gold and silver nanowire patterns were fabricated by electron beam lithography for experimental measurements. The wavelength SPR sensor was also designed for these experiments. The material-dependent field enhancements on nanowire patterns were first calculated based on Maxwell`s equations. Resonance wavelength shifts were indicated as changes in the refractive index from 1.33 to 1.36. The SPR sensor with silver nanowire patterns showed a much larger resonance wavelength shift than the sensor with gold nanowire patterns, in good agreement with simulation results. These results suggest that silver nanowire patterns are more efficient than gold nanowire patterns, and could be used for sensitivity enhancements in situations where biocompatibility is not a consideration.
Study on Remedies of Convergence Design for Personalized Fire Helmets
Ahn, Yong Jun ; Kang, Myung Chang ; Lee, Tae Gu ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 371~376
DOI : 10.7736/KSPE.2016.33.5.371
Safety related workers, such as firefighters, have to wear a protective helmet. The Development of Helmets for safety is in progress to promote the wearable device industry. Several accidents caused by negligence in recent days have raised public attention to safety. For this reason, the amount of national budget funding for the study of fire-fighting and smart safety helmets has increased. However, most previous studies have focused on safety, rather than the application of new technologies based on physical attributes, especially the characteristics of head shape and size, even though fire helmets play the critical role of protection from flames and external shocks etc. in an emergency. This paper will present the smart technologies and newly developed designs for safety helmets that are personalized for each firefighter, based on the characteristics of their head, and will help a rescue operation to be much more safe and efficient.
Development of Handpiece Moving System (HMS) for Cutting Performance Evaluation of Dental Ultrasonic Surgery Unit
Sa, Min-Woo ; Shim, Hae-Ri ; Ko, Tae-Jo ; Lee, Jong-Min ; Kim, Jong Young ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 377~383
DOI : 10.7736/KSPE.2016.33.5.377
Recently, research on bone fracture and osteoplasty using ultrasonic bone surgery unit has been ongoing in the fields of dentistry, plastic surgery, and otorhinolaryngology. However, detailed data evaluation with ultrasonic bone surgery unit has not been conducted to date. In this study, we developed handpiece moving system (HMS) for cutting performance evaluation. In the experimental setup of HMS, a handpiece was immobilized, and bone samples from cortical bone of bovine leg were prepared. Also, the experimental process was described in detail, and a basic experiment was carried out to evaluate the cutting performance. Future study is required on all experimental process conditions by HMS.
Forming Properties of Micro Random Pattern Using Micro Abrasive Paper Tool by Roll to Plate Indentation Method
Jeong, Ji-Young ; Je, Tae-Jin ; Moon, SeungHwan ; Lee, Je-Ryung ; Choi, Dae-Hee ; Kim, Min-Ju ; Jeon, Eun-chae ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 385~392
DOI : 10.7736/KSPE.2016.33.5.385
Recently in the display industry, demands for high-luminance and resolution of display devices have been steadily increasing. Generally, micro linear patterns are applied to an optical film in order to improve its properties of light. However, these patterns are easily viewed to eyes and moire phenomenon can be occurred. Micro random patterns are proposed as a method to solve these problems, increasing light-luminance and light-diffusion. However, conventional pattern manufacturing technologies have long processing times and high costs making it difficult to apply to large area molds. In order to combat this issue, micro-random patterns are formed by using a roll to plate indentation method along with abrasive paper tools composed of AlSiO2, SiC, and diamond grains. Also, forming properties, such as size and fill-factor of random patterns, are analyzed depending on type, mesh of abrasive paper tools, and indentation forces.
Study on Hardening Depth by Induction Hardening Analysis of Sprocket Using FEA and Experiment Results
Choi, Jin Kyu ; Nam, Kwang Sik ; Kim, Jae Ki ; Choi, Ho Min ; Yeum, Sang Hoon ; Lee, Seok Soon ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 393~400
DOI : 10.7736/KSPE.2016.33.5.393
High frequency induction heating (HFIH) is used in many industries and has a number of advantages, including reliability and repeatability. It is a non-contact method of providing energy-efficient heat in the minimum amount of time without using a flame. Recently, HFIH has been actively studied using the finite element method (FEM), however, these studies only focused on the accuracy of the analysis. In this paper, we can measure joule heat distributions by the electromagnetic analysis for HFIH and the temperature distribution from the heat transfer analysis by applying joule heat for a sprocket. The sprocket is heated over
due to joule heat and then cooled to under
by using cooling
water. These processes were used to calculate the FEM and then compared to our experimental results. The calculated outcome may be used to predict hardening depth in HFIH.
Study on Analysis Process for Slip Torque Design Control of Impact Hammer Drills
Kim, Seung Hyeon ; Kwon, Sang Youp ; Ko, Dong Shin ; Hur, Deog Jae ; Dong, Kwang Ho ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 401~407
DOI : 10.7736/KSPE.2016.33.5.401
This paper describes the derivation methodology of the working torque predictive model that can be used in the initial design stages of the impact hammer tool. The working torque control mechanism is designed, taking into account various factors, such as the force of the spring and friction. Firstly, the analysis dynamic model for working environments was modeled as an additional bush and spring, and verified by comparing the test results of the working torque. Secondly, the main performance parameters of the working torque were theoretically defined by analyzing the operating mechanism. The equation to predict the working torque was derived using the dynamic analysis results according to the value changes of the parameters. The prediction equation of the working torque was validated by comparing the predicted results with the experimental data. The error difference between the experimental data and the predictive model results was found to be 8.62%.
Color Adjustment Study by Micro-Pattern Embedding in Optical Multilayer Thin Film
Kim, Min ; Woo, Ju Yeon ; Yoon, Junho ; Hwangbo, Chang Kwon ; Han, Chang-Soo ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 409~417
DOI : 10.7736/KSPE.2016.33.5.409
It is well known that Morpho butterflies show distinctive, brilliant and iridescent colors and have micro-nano scale structures, instead of dyes and pigments, on their wings. This structural coloration is regarded as a novel technique to express color with a long lifetime, ease and precise tenability. Here, we studied optical multilayer thin films with thickness of several tens of nm (
) and lens-shape micro-patterns. Fabrication and characterization of the multilayer stacking structure and the micro-pattern structure were performed and the films were analyzed via several optical measuring techniques. Finally, we discussed how the micro-pattern structure could enhance independence with color changes according to the viewing angle.
Preliminary Study on Pre-Heating Process of Stellite21 Powder Using Electron Beam
Lee, Ho-Jin ; Song, Jae-Guk ; Kim, Jin-Suk ; Ahn, Dong-Gyu ;
Journal of the Korean Society for Precision Engineering, volume 33, issue 5, 2016, Pages 419~425
DOI : 10.7736/KSPE.2016.33.5.419
A powder spreading phenomenon is one of disadvantageous characteristics of the powder bed fusion process using electron beams. The powder spreading phenomenon can be controlled using a pre-heating process of metallic powders. The aim of this paper was to investigate the preheating process of Stellite21 powder using electron beams. Powder spreading experiments were performed to examine the influence of process parameters on the spreading behaviors of Stellite21 powder. Powder heating experiments were carried to investigate the effects of the focusing current of the electron beam on the quality of the heated region. Using the results of the powder spreading and heating experiments, an appropriate combination of process parameters was obtained. The pre-heating experiment of Stellite21 was performed using the estimated combination of process parameters. The results of preheating experiments showed that the preheated Stelllite21 layer with desired characteristics can be created when the estimated combination of process parameters is applied.