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A Novel Design of Suspension System for Driver's Seat
Thanh-Tung Luu(Thanh-Tung Luu),박성태(Sung-Tae Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
A driver's seat can be modeled with a suspension system of spring, mass and damper. To increase the capacity of anti-vibration, the natural frequency should be decreased as low as possible. In this paper, the method to decrease the natural frequency by the potential energy is introduced. In addition, the experiment is done on a small model to prove the theorem.
Duy Tran Luu,Truong Vinh Tran Luu 아시아기술혁신학회 2023 Asian Journal of Innovation and Policy Vol.12 No.2
This paper employs datasets from the Enterprise Survey conducted by the World Bank to examine the relationship between four types of innovation defined by the Oslo Manual (OECD, 2005): product innovation, process innovation, marketing innovation, organization innovation, and the firm performance in the selected developing ASEAN economies. The main objective of this paper is to understand the characteristics of innovation activities at the firm level and how various innovation types affect firm performance. The empirical results from ASEAN manufacturing firms reveal that product innovation positively affects firms’ performance, while non-technological innovations are negatively related to the performance of firms. The further employed quantile regression provides more insights into the roles of innovation types on different levels of firm performance: while product and process innovations actively contribute to the small and medium-size firms (below 25th quantile and median), organizational and marketing innovations negatively affect them. Interestingly, the role of process innovation decreases when firm performance grows.
Investigation of the Microstructure of Mechanically Milled Nd40Fe30Co15Al10B5 Alloy
Luu Tien Hung,Nguyen Huy Dan 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
The microstructure of Nd40Fe30Co15Al10B5 alloys fabricated by using a high-energy ball-milling method was investigated by using high-resolution transmission electron microscopy (HRTEM), scan- ning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), selected area electron diraction (SAED) and electron backscatter diraction (EBSD) techniques. The crystalline phases found in the alloys were the tetragonal Nd2(Fe,Co,Al)14B (denoted as the 2 : 14 : 1 phase), the tetragonal Nd6(Fe,Co,Al)14 (denoted as the phase) and the fcc Nd-rich (a = 0.51 nm) phases. The formation of 2 : 14 : 1 crystallites supposedly contributed to the high coercivities up to 24 kOe for the alloys. The microstructure of Nd40Fe30Co15Al10B5 alloys fabricated by using a high-energy ball-milling method was investigated by using high-resolution transmission electron microscopy (HRTEM), scan- ning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), selected area electron diraction (SAED) and electron backscatter diraction (EBSD) techniques. The crystalline phases found in the alloys were the tetragonal Nd2(Fe,Co,Al)14B (denoted as the 2 : 14 : 1 phase), the tetragonal Nd6(Fe,Co,Al)14 (denoted as the phase) and the fcc Nd-rich (a = 0.51 nm) phases. The formation of 2 : 14 : 1 crystallites supposedly contributed to the high coercivities up to 24 kOe for the alloys.
Effect of thickness on the microstructure and soft magnetic properties of CoFeHfO thin films
Luu Van Tho,이광은,김철기,김종오 한국물리학회 2008 Current Applied Physics Vol.8 No.6
The thickness effects on the microstructure and soft magnetic properties of CoFeHfO thin films have been investigated in the range of 100–600 nm. There was a significant change in the coercivity (Hc) and the anisotropy (Hk) value with increasing film thickness, but the saturation induction and the resistivity almost remain unchanged. Hc and Hk reached a minimum value of 0.19 Oe and a maximum value of 50 Oe, respectively at 200 nm film thickness. The high saturation magnetic induction is 21 kG and resistivity is 500μΩ cm. The origin of the changing Hc and Hk values is discussed in detail based on change of microstructure along with film thickness. The thickness effects on the microstructure and soft magnetic properties of CoFeHfO thin films have been investigated in the range of 100–600 nm. There was a significant change in the coercivity (Hc) and the anisotropy (Hk) value with increasing film thickness, but the saturation induction and the resistivity almost remain unchanged. Hc and Hk reached a minimum value of 0.19 Oe and a maximum value of 50 Oe, respectively at 200 nm film thickness. The high saturation magnetic induction is 21 kG and resistivity is 500μΩ cm. The origin of the changing Hc and Hk values is discussed in detail based on change of microstructure along with film thickness.
Automatic Suggestion for PubMed Query Reformulation
Luu Anh Tuan,Jung-jae Kim 한국정보과학회 2012 Journal of Computing Science and Engineering Vol.6 No.2
Query reformulation is an interactive process of revising user queries according to the query results. To assist biomedical researchers in this process, we present novel methods for automatically generating query reformulation suggestions. While previous work on query reformulation focused on addition of words to user queries, our method can deal with three types of query reformulation (i.e., addition, removal and replacement). The accuracy of the method for the addition type is ten times better than PubMed’s “Also try”, while the execution time is short enough for practical use.
Configuration of Actuator and Sensor Interface Bus Network using PLC
Luu, Hoang-Minh,Park, Young-San The Korean Society of Marine Environment and safet 2014 海洋環境安全學會誌 Vol.20 No.3
A kind of field bus called Actuator and Sensor interface bus(AS-i) was designed in this paper. The configuration of AS-i network system used Application Specific Integrated Circuit(ASIC) SAP5S chip and PLC S7-200 station, which included CPU 224 and AS-i master module CP 243-2. We also created an example program for PLC S7-200 to control AS-i network. The fire and smoke detection system was made with AS-i network system that was designed. This system had got more advantages than other system such as number of stations, easy installation, wide working area, etc. And designed system can be used as a partner network for higher level field bus networks.