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  Current Issue
Vol. 35, No. 3
March, 2018
  Indexed in
  Journal of the Korean Society for Precision Engineering  
Aims and Scope
Journal of the Korean Society for Precision Engineering (JKSPE) is devoted to publishing original research articles with high ethical standard on all aspects of precision…
Ethical Policy
Code of Ethics for Academic Activities of the Korean Society for Precision Engineering (KSPE) Enacted on October 9, 2008 Chapter 1: Overall Rules Article 1: Purpose…
Editor-in-Chief: Sun-Kyu Lee
Vice Editor-in-Chief: Bo Hyun Kim
JKSPE Editorial Board
ISSN 1225-9071(Print)
ISSN 2287-8769(Online)
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  Best Figures of the Month  
Vol. 35, No. 1, pp. 71-77
Title: Measurement of Auto-Focus Driving Distance for Mobile Phone Camera Lens Using a Confocal Displacement Sensor
Corresponding Author: Hagyong Kihm
Abstract: In mobile phone cameras, usually a voice coil motor (VCM) is used as a micro-positioning device for the image autofocus (AF) because of its low cost, simplicity, and reliability. Measuring the actual displacement of the VCM is important when we assemble the camera and test the AF performance for distant objects. In this paper, we propose using a confocal displacement sensor for calibrating the VCM displacement, where the axial chromatic aberration of a confocal objective lens is used to measure the target position. The tolerance angle for the dynamic tilt of a VCM increased up to ±15 o because of the large numerical aperture of the confocal objective lens, which increased the stability of the repeatable in-line inspection. We compared the measurement robustness of the confocal displacement sensor with that of the laser displacement sensor in a mass production line to verify its performance superiority. …
Vol. 35, No. 1, pp. 111-115
Title: Fabrication of Three-Dimensional Complex Shape PDMS Microstencil Using Air-Knife System and their Cell Culture Application
Corresponding Author: Gyu Man Kim
Abstract: In this study, we propose a fabrication method of three-dimensional complex shape polydimethylsiloxane microstencils. Three-dimensional complex shape polydimethylsiloxane (PDMS) microstencils were fabricated by an air-knife system and PDMS casting form preparing master mold by photolithography, diffuser lithography and polyurethane acrylate (PUA) replication. PDMS microstencils shape was a production of the hemispherical and quadrangular pyramid. When the prepolymer of PDMS was spin-coated onto the three-dimensional complex shape master mold, a thin layer of prepolymer remained on top of the master's structure and consequently prevented formation of perforated patterns. This residual layer was easily removed by the air-knife. The air-knife system was controlled by the flow rate of N2 gas and conveying speed of the master mold. Results revealed the fabricated three-dimensional complex shape PDMS microstencils, could be useful for application of three-dimensional cell culture device …
Vol. 35, No. 1, pp. 95-101
Title: Thermal Comparison of Conventional and Conformal Cooling Channel Designs for a Non-Constant Thickness Screw Cap
Corresponding Author: Eric Dimla
Abstract: Complex parts are manufactured with high production rates using plastic injection. Defects in injection moulded parts are typically caused by non-uniform cooling. The design of cooling channels is a key step in the mould tool design process. Laser sintering allows for the direct fabrication at reasonable price, complex 3D tools with integrated cooling channels without the need of fixtures. This technique allows the designer to optimise the position of cooling channels relative to the heat source. This paper presents a simulation study for a non-constant thickness threaded screw cap. Results comparing conventional to conformal cooling channel show that the range between the highest and the lowest part surface temperatures is reduced by 18.8%. On the other hand, there is only a decrease of 3.9% for the maximum temperature in the interior of the threaded screw cap. Conformal cooling using laser sintering in tool manufacturing achieves an improved heat transfer leading to a better part quality …
Current Issue Archive
JKSPE Vol. 35, No. 3
The State of the Art in Electrochemical Micro Machining Technologies
Pyeong An Lee1, Eunseok Nam2, Bo Hyun Kim3

전기화학 미세가공기술의 현황
이평안1, 남은석2, 김보현3

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 229-239, 2018.
    Full text via DOI      PDF Links
A Review of State of the Art of Electron Beam and Ion Beam Machining
Hang-Eun Joe1, Eun-Goo Kang2, Martin B. G. Jun1

전자 빔과 이온 빔 가공기술의 현황
조항은1, 강은구2, 전병국1

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 241-252, 2018.
    Full text via DOI      PDF Links
Mechanical Cutting Process Trends for Difficult-to-Cut Materials : A Review
Myeong Gu Gang1, Gyuho Kim1, Kangwoo Shin2, Anmok Jeong2, Hyo-Young Kim2, Cheol-Ho Kim2, Seok-Woo Lee2, Tae-Gon Kim2

난삭재 절삭 가공공정 기술의 현황
강명구1, 김규호1, 신강우2, 정안목2, 김효영2, 김철호2, 이석우2, 김태곤2

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 253-267, 2018.
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The State of the Art in FEM Analysis Technology of the Machining Process
Dong Min Kim1, Do Young Kim1, Hyung Wook Park1

기계 가공공정 유한요소법 해석 기술의 현황
김동민1, 김도영1, 박형욱1

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 269-278, 2018.
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CNC Algorithms for Precision Machining: State of the Art Review
Chan-Young Lee1, Seong Hyeon Kim1, Tae In Ha1, Jaehong Min1, Soon-Hong Hwang1, Byung-Kwon Min1

정밀가공을 위한 CNC 알고리즘 연구 현황
이찬영1, 김성현1, 하태인1, 민재홍1, 황순홍1, 민병권1

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 279-291, 2018.
    Full text via DOI      PDF Links
The State of the Art in Monitoring Technology of Machining Operations
Ki Hyeong Song1, Dong Yoon Lee1

기계 가공공정 모니터링 기술의 현황
송기형1, 이동윤1

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 293-304, 2018.
    Full text via DOI      PDF Links
Fabrication of Micro Column Array by Micro EDM Using Eccentric Tool Electrodes
Pyeong An Lee1, Sun Keel Kim1, Bo Hyun Kim2

방전 가공과 마이크로 편심 공구전극을 이용한 미세 기둥 어레이 가공
이평안1, 김선길1, 김보현2

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 305-310, 2018.
    Full text via DOI      PDF Links
Adaptive Model Free Speed Control Algorithm of DC Motors Based on Recursive Least-Squares with Forgetting Factor
Kwang Seok Oh1 Ja Ho Seo2

"망각인자를 이용한 순환최소자승 기반 DC모터의 적응형 모델 독립
오광석1, 서자호2

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 311-318, 2018.
    Full text via DOI      PDF Links
Analysis of Thermal Reflow Process for Polymer Microlens Fabrication
Ji Hoon Lee1, Sang Hyuk Yum2, Seung Mo Kim1

Polymer Microlens 제작을 위한 Thermal Reflow 공정 해석
이지훈1, 염상혁2, 김승모1

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 319-325, 2018.
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Performance Improvement and Analysis Verification of a Car Door Lock in the Upper Weatherstrip Zone
Moo Seok Kwak1, Seon Ung Choi1, Kwon Hee Kim2

자동차 도어 상단부 잠금장치의 성능 개선 및 해석 검증
곽무석1, 최선웅1 김권희2

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 327-333, 2018.
    Full text via DOI      PDF Links
Experimental Investigation on Fatigue Characteristics of SPR (Self-Piercing Rivet) and Hybrid Joints
Dae Yeong Kim1, Dong Ok Kim2, Seong S. Cheon3

SPR (Self-Piercing Rivet)과 Hybrid 접합부의 피로 특성에 관한 연구
김대영1, 김동옥2, 전성식3

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 335-340, 2018.
    Full text via DOI      PDF Links
Thermal-Structural Coupled Numerical Analysis for Design of High-Temperature Extruder of FDM 3D Printers
Da-Yeon Shin1, Hyun-Joong Lee1, Chang-Whan Lee1, Keun Park1

압출적층형 3차원 프린터의 고온 압출부 설계를 위한 열-구조 연계수치해석
신다연1, 이현중1, 이창환1, 박 근1

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 341-347, 2018.
    Full text via DOI      PDF Links
Multi-Material Additive Manufacturing Process for 3-Dimensional Circuit Device Fabrication
Sung Taek Oh1, In Hwan Lee2, Ho-Chan Kim3, Hae-Yong Cho2

3차원 회로장치 제작을 위한 다중재료 복합 부가가공 공정
오성택1, 이인환2, 김호찬3, 조해용2

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 349-354, 2018.
    Full text via DOI      PDF Links
Frequency-Tuning of Magnetostrictive Energy Harvesting Device
Mun-Su Kim1 Young-Woo Park2

자기변형 에너지 하베스팅 장치의 고유진동수 조절에 관한 연구
김문수1, 박영우2

J. Korean Soc. Precis. Eng., Vol. 35,  No. 3  pp. 355-360, 2018.
    Full text via DOI      PDF Links
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