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Mirror surface finishing of hardened die steel by high-Power ultrasonic elliptical vibration cutting

Jung H., Shamoto E., Ueyama T., Hamada S., Xu L.

Journal of Machine Engineering

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2016

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Vol. 16, No. 1

5--14

EN

Ultrasonic elliptical vibration cutting has recently been utilized in industry for finishing of various precision parts such as mirror surface finishing and precision micro machining of dies and molds. However, its application has been limited to high-cost ultra-precision machining, where depth of cut is typically in a range from a few micrometers to several tens of micrometers due to power limitation of the vibration device. To expand its application to low-cost mirror surface finishing with ordinary machining facilities, a high-power elliptical vibration device was developed in this research. The elliptical vibration cutting of hardened die steel was examined by applying the developed high-power elliptical vibration device with single crystalline diamond tools. Pick feed was kept to be 0.02 mm to obtain mirror quality surfaces, while depth of cut was increased up to 0.4 mm to verify performance of the high-power elliptical vibration cutting. By analyzing the experimental results, it was clarified that mirror surface finishing of the hardened die steel can be achieved at the large depth of cut with practically acceptable tool life.

2

Evaluation of an Incentive-Based Obesity Management Program in a Workplace

Hwang G., Yoon C., Jung H., Kim Y.

International Journal of Occupational Safety and Ergonomics

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2011

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Vol. 17, No. 2

147--154

EN

This study is to analyze the effectiveness of an incentive-based obesity management program (the Midas Project aimed to improve good health habits) at an electronics company in 2005. A total of 95 company participants with a high body mass index (BMI) were recruited for a health promotion program for 3 months that awarded gold medals as an incentive for body fat loss. BMI decreased from 28.8 to 27.8 kg/m² (p = .000), body weight decreased from 87.2 to 83.5 kg (p = .000), and body fat weight decreased from 25.4 to 23.3 kg (p = .000). Systolic and diastolic blood pressure decreased from 130.5 to 125.1 mmHg (p = .002), from 86.4 to 81.7 mmHg (p = .009). The percentage of participants exercising more than 3 times per week increased from 27.3 to 52.3% (p = .000). The percentage who avoided overeating at parties and midnight eating increased from 65.9 to 72.7% (p = .767) and 70.5 to 84.1% (p = .172), respectively. This incentive-based obesity management program was effective in improving not only BMI but also health status.

3

All-Optical Techniques Enabling Packet Switching with Label Processing and Label Rewriting

Jung H., Llorente J. H., Tangdiongga E., Koonen T., Dorren H.

Journal of Telecommunications and Information Technology

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2009

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nr 1

20-28

EN

Scalability of packet switched cross-connects that utilize all-optical signal processing is a crucial issue that eventually determines the future role of photonic signal processing in optical networks. After reviewing several labeling techniques, we discuss label stacking and label swapping techniques and their benefits for scalable optical packet switched nodes. All-optical devices for implementing the packet switch based on the labeling techniques will be described. Finally, we present a 1×4 all-optical packet switch based on label swapping technique that utilizes a scalable and asynchronous label processor and label rewriter. Error-free operation indicates a potential utilization of the swapping technique in a multihop packet-switched network.

4

Rura szklana jako element konstrukcyjny w budownictwie. Część 3

Jung H.

Świat Szkła

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2004

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nr 10 [79]

71-73

PL

Zastosowanie wielowarstwowych rur szklanych jako materiału konstrukcyjnego stworzyło w budownictwie zupełnie nowe możliwości estetyczne i statyczne. Projekty budowlane, których konstrukcje nośne dotychczas mogły być wykonane tylko ze stali i betonu, są obecnie możliwe do wykonania także z przezroczystego materiału, wielowarstwowej rury szklanej. Szczegółowe informacje o tym zostały przedstawione w "Świecie Szkła" 12/03, na stronie 52.