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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.
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.
Comparison of various image fusion methods for impervious surface classification from VNREDSat-1
Luu, Hung V.,Pham, Manh V.,Man, Chuc D.,Bui, Hung Q.,Nguyen, Thanh T.N. The International Promotion Agency of Culture Tech 2016 International Journal of Advanced Culture Technolo Vol.4 No.2
Impervious surfaces are important indicators for urban development monitoring. Accurate mapping of urban impervious surfaces with observational satellites, such as VNREDSat-1, remains challenging due to the spectral diversity not captured by an individual PAN image. In this article, five multi-resolution image fusion techniques were compared for the task of classifting urban impervious surfaces. The result shows that for VNREDSat-1 dataset, UNB and Wavelet tranformation methods are the best techniques in reserving spatial and spectral information of original MS image, respectively. However, the UNB technique gives the best results when it comes to impervious surface classification, especially in the case of shadow areas included in non-impervious surface group.
LUU HON VU 단국대학교 한문교육연구소 2020 International Han-character Education Research Vol.3 No.1
본고는 『베트남의 중국어 학습자들의 개사 말뭉치(코퍼스)』 (2018년판)를 토대로 초급 중국어 수준의 베트남 학습자들의 지속상 표지 ‘着’ 오류 현황을 고찰한다. 연구를 통해 학습자들의 오류가 ‘첨가’, ‘혼동’, ‘(필요 성분의) 누락’ 이라는 세 유형으로 귀납됨을 알아냈다. 그 결과 ‘첨가’가 가장 높은 비율을 차지하고 그 다음이 ‘혼동’ 오류이며, ‘(필요 성분의) 누락’ 이 가장 낮은 비율을 차지하는 오류 유형을 알 수 있었다. 목적어 규칙의 지나친 일반화가 이러한 오류들 의 주요 원인이었다. 필자는 이를 기반으로 교학에 대한 몇 가지 의견을 제시하려고 한다. The article is based on the “Chinese Interlanguage Corpus of Vietnamese Students” (2018 edition) to investigate the errors in the durative aspect “zhe” (着) by Vietnamese students at the elementary Chinese level. The study found that students’ errors can be classified into three types: over-inclusion, misselection and omission. Among them, over-inclusion is the most common type of error, followed by misselection, and omission is the least common type of error. Excessive generalization of target language rules is the main reason for errors. On this basis, we made some teaching suggestions.
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.