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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.
Effect of Axial-Layered Permanent-Magnet on Operating Temperature in Outer Rotor Machine
Luu, Phuong Thi,Lee, Ji-Young,Kim, Ji-Won,Chun, Yon-Do,Oh, Hong-Seok The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.6
This paper discusses the thermal effect of the number of permanent-magnet (PM) layers in an outer rotor machine. Depending on the number of axial-layer of PM, the operating temperature is compared analytically and experimentally. The electromagnetic analysis is performed using 3-dimensional time varying finite element method to get the heat sources depending on axial-layered PM models. Then thermal analysis is conducted using the lumped-parameter-thermal-network method for each case. Two outer rotor machines, which have the different number of axial-layer of PM, are manufactured and tested to validate the analysis results.
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.
Luu Xuan Quy,Lee Kyeongmin,Jun Jae Kwan,Suh Mina,Jung Kyu-Won,임명철,최귀선 한국역학회 2022 Epidemiology and Health Vol.44 No.-
OBJECTIVES: This study aimed to investigate the effect of cervical cancer screening by Papanicolaou (Pap) smears on the long-term survival of cervical cancer patients. METHODS: We constructed a retrospective cohort of 14,903 women diagnosed with invasive cancer or carcinoma in situ in 2008 and 2009 and followed up until December 31, 2019, by using individual-level data from 3 national databases of the Korean National Cancer Screening Program, the Korean Central Cancer Registry, and death certificates. Cox proportional-hazards regression was used to investigate the effect of cervical cancer screening on mortality. RESULTS: In total, 12,987 out of 14,867 patients (87.4%) were alive at the end of the follow-up period (median: 10.5 years). Screened patients had a 38% lower risk of cervical cancer death than never-screened patients (hazard ratio [HR], 0.62; 95% confidence interval [CI], 0.54 to 0.70). Screening was associated with 59% and 35% lower risks of death, respectively, in screened patients with localized and regional stages. Furthermore, lower HRs among women who received screening were observed in all age groups, especially women aged 50–59 years (HR, 0.54; 95% CI, 0.42 to 0.69). The lowest HR for cervical cancer death was reported among patients screened within the past 2 years (HR, 0.54; 95% CI, 0.47 to 0.63), and the HRs increased with increasing time intervals. CONCLUSIONS: Pap smear screening significantly reduced the risk of cervical cancer-specific death in Korean women across all cancer stages.
Luu Xuan Quy,Lee Kyeongmin,Jun Jae Kwan,Suh Mina,Jung Kyu-Won,최귀선 한국역학회 2022 Epidemiology and Health Vol.44 No.-
OBJECTIVES: This study investigated the effect of mammography screening on the long-term survival of breast cancer (BC) patients aged 40 years or older according to their screening history and duration since screening. METHODS: The study cohort was organized from 3 nationwide databases of the Korean National Cancer Screening Program, the Korean Central Cancer Registry, and death certificates. We included 24,387 women diagnosed with invasive BC or ductal carcinoma in situ in 2008 and 2009 and followed up until December 31, 2019. Cox proportional-hazards regression was used to investigate the effect of BC screening on the risk of death. RESULTS: Overall, 20,916 of 24,387 patients (85.8%) were alive at the end of the follow-up period (median: 10.5 years). The long-term survival rate was significantly lower in the never-screened group (80.3%) than in the screened group (88.9%) (p< 0.001). A 35% reduction in the risk of BC death (hazard ratio [HR], 0.65; 95% confidence interval [CI], 0.60 to 0.70) from screening was observed. A subgroup analysis according to the cancer stage showed 62%, 36%, and 24% lower risks of BC death for the localized stage, regional stage, and distant stage, respectively. Women aged 40-49 years received the least benefit from BC screening (HR, 0.71; 95% CI, 0.62 to 0.81). CONCLUSIONS: Mammography screening was effective in reducing the risk of BC-specific death in Asian women across all cancer stages. However, this effect was relatively small among women in their 40s, suggesting that more detailed and specialized screening strategies are needed for that age group.
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.
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.