자동차 교류발전기의 재제조 프로세스 설계

Liyana Roslan, Nurul Ain Azmi, 정원(Won Jung) 한국산업경영시스템학회 2011 한국산업경영시스템학회지 Vol.34 No.4

재제조는 사용 후 제품을 체계적으로 회수하여 분해, 세척, 검사, 보수조정, 재조립 등의 공정을 거쳐 원래의 성능을 유지할 수 있도록 만드는 과정이다. 자동차 교류발전기를 재제조하기 위해서는 재제조품에 요구되는 품질 및 신뢰성을 확실히 달성하기 위하여 공정 별 복잡한 작업들에 대하여 세부적인 사항들을 결정하고 이를 설계하는 일이 중요하다. 본 연구의 목적은 재제조를 위한 최적의 공정설계를 위해 FMEA를 활용한 체계적인 가이드라인을 제시하여 재제조품의 품질 및 신뢰성을 확보하는데 있다. 코어 부품의 상태 수준에 따른 작업과정과 재정비여부를 결정하기 위해 위험성 지표에 의한 방법도 연구되었다. 특히, 재제조기업의 사례연구를 통하여 FMEA의 유용성과 가이드라인의 적절성을 보여준다. This paper outlines a systematic guideline for remanufacturing process using the Failure Mode and Effect Analysis (FMEA) method in order to estimate the reliability and quality of the remanufactured alternator. The method is just a tool to help, but the remanufacturer must determine the optimal remanufacturing process and specific inspection and production that will turn the alternator as-good-as new and place the product into the market with reliability and quality equal to a new product. FMEA is a method that is widely used in industry and has shown its value and effectiveness in the above remanufacturing case study. Actions taken often result in a lower severity, occurrence or detection rating. Redesign may result in lower severity and occurrence ratings while inserting validation controls and maintenance can reduce the detection rating. The revised ratings are recorded with the originals on the FMEA template form. After these corrective actions and revisions have been established, evaluation of the ranks can be repeated, until the redesign and control parameters comply with safety standards.

Log-based petrophysical analysis of Khatatba Formation in Shoushan Basin, North Western Desert, Egypt

Liyana Nadiah Osli,Nur Yusrina Yakub,Mohamed Ragab Shalaby,Md. Aminul Islam 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.6

This paper aims to investigate the good reservoir quality and hydrocarbon potentiality of the Khatatba Formation, Qasr Field in the Shoushan Basin of the North Western Desert, Egypt by combining results from log-based petrophysical analysis, petrographic description and images from scanning electron microscope (SEM). Promising reservoir units are initially identified and evaluated through well log analysis of three wells in the field of study. Petrophysical results are then compared with petrographic and SEM images from rock samples to identify features that characterize the reservoir quality. Well log results show that Khatatba Formation in the study area has good sandstone reservoir intervals from depths ranging from 12848 ft to 13900 ft, with good effective porosity records of 13–15% and hydrocarbon saturations of greater than 83%. Petrographic analysis of these sandstone reservoir units indicate high concentrations of vacant pore spaces with good permeability that can be easily occupied by hydrocarbon. The availability of these pore spaces are attributed to pore-enhancing diagenetic features, mainly in the form of good primary porosity and dissolution. SEM images and EDX analysis confirmed the presence of hydrocarbon, therefore indicating a good hydrocarbon-storing potential for the Khatatba Formation sandstones.

Remanufacturing Process Design for Automotive Alternator

Liyana Roslan,Nurul Ain Azmi,정원 한국산업경영시스템학회 2011 한국산업경영시스템학회지 Vol.34 No.4

재제조는 사용 후 제품을 체계적으로 회수하여 분해, 세척, 검사, 보수조정, 재조립 등의 공정을 거쳐 원래의 성능을 유지할 수 있도록 만드는 과정이다. 자동차 교류발전기를 재제조하기 위해서는 재제조품에 요구되는 품질 및신뢰성을 확실히 달성하기 위하여 공정 별 복잡한 작업들에 대하여 세부적인 사항들을 결정하고 이를 설계하는 일이 중요하다. 본 연구의 목적은 재제조를 위한 최적의 공정설계를 위해 FMEA를 활용한 체계적인 가이드라인을 제시하여 재제조품의 품질 및 신뢰성을 확보하는데 있다. 코어 부품의 상태 수준에 따른 작업과정과 재정비여부를 결정하기 위해 위험성 지표에 의한 방법도 연구되었다. 특히, 재제조기업의 사례연구를 통하여 FMEA의 유용성과 가이드라인의 적절성을 보여준다.

Lunar Effect on Stock Returns and Volatility: An Empirical Study of Islamic Countries

Nur Liyana MOHAMED YOUSOP,Wan Mohd Farid WAN ZAKARIA,Zuraidah AHMAD,Nur’Asyiqin RAMDHAN,Norhasniza MOHD HASAN ABDULLAH,Sulistya RUSGIANTO 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.5

The main objective of this article is to investigate the existence of the lunar effect during the full moon period (FM period) and the new moon period (NM period) on the selected Islamic stock market returns and volatilities. For this purpose, the Ordinary Least Squares model, Autoregressive Conditional Heteroscedasticity model, Generalised Autoregressive Conditional Heteroscedasticity model and Generalised Autoregressive Conditional Heteroscedasticity-in-Mean model are employed using the mean daily returns data between January 2010 and December 2019. Next, the log-likelihood, Akaike Information Criterion and Schwarz Information Criterion value are analyzed to determine the best models for explaining the returns and volatility of returns. The empirical results have deduced that, during the NM period, excluding Malaysia, the total mean daily returns for all of the selected countries have increased mean daily returns in contrast to the mean daily returns during the FM period. The volatility shocks are intense and conditional volatility is persistent in all countries. Subsequently, the volatility behavior tends to have lower volatility during the FM period and NM period in the Islamic stock market, except Malaysia. This article also concluded that the ARCH (1) model is the preferred model for stock returns whereas GARCH-M (1, 1) is preferred for the volatility of returns.

Digital fabrication of paper electronics using solid film transfer

Seunghyun Back,Liyana Hazwani Binti Zamri,Ingu Kang,Bongchul Kang 한국생산제조학회 2018 한국생산제조시스템학회 학술발표대회 논문집 Vol.2018 No.10

Preventive effect of Elateriospermum tapos seed extract against obese Sprague Dawley rats

Kokila Vani Perumal,Nor Liyana Ja’afar,Santhra Segaran Balan,Azrina Zainal Abidin,Daryl J. Arapoc,Nurul Husna Shafie,Hasnah Bahari 경희대학교 융합한의과학연구소 2020 Oriental Pharmacy and Experimental Medicine Vol.20 No.1

This study aimed to investigate the preventive role of Elateriospermum tapos seed extract against obese Sprague Dawley rats through assessment of bodyweight, caloric intake, organs weight, biological assays and histopathology. Thirty-six male Sprague Dawley rats were assigned into six groups of normal control (G1) group fed with standard chow diet, negative control (G2), positive control (G3) and treatment groups (G4, G5 and G6) were on high-fat and cafeteria diet for 9 weeks. G3 group was given 10 mg kg−1 of Orlistat while treatment groups were supplemented with E. tapos seed extract of 5 mg kg−1, 25 mg kg−1 and 125 mg kg−1 orally daily for another 10 weeks. Bodyweight and food intake were monitored weekly. At the end, liver, retroperitoneal white adipose tissue (rpWAT) and blood were collected for analysis of total cholesterol (TC), triglycerides (TG), low-density (LDL-C) and high density lipoprotein (HDL-C). The E. tapos seed treated groups showed significant (p < 0.05) reduction in bodyweight, caloric intake, liver and rpWAT weight as compared to the G2 group. G6 group showed tremendous improvement of liver histopathology and biological assay. There was a significant decrease (p < 0.05) of TC, TG, and LDL-C level and significant increase (p < 0.05) of HDL-C in the E. tapos seed treated group as compared to G2 group. Based on the findings, E. tapos seed extract exhibited a great potential as an anti-obesity. The extract promoted the fat oxidation by removing the uptake and storage of fat by the adipose cells and also decrease the fatty acid synthesis.

Analysis of flows and prediction of CH10 airfoil for unmanned arial vehicle wing design

Aabid, Abdul,Khairulaman, Liyana Nabilah Binti,Khan, Sher Afghan Techno-Press 2021 Advances in aircraft and spacecraft science Vol.8 No.2

The unmanned aerial vehicle (UAV) is becoming popular from last two decades and it has been utilizing in enormous applications such as aerial monitoring, military purposes, rescue missions, etc. Hence, the present work focused on the design of the UAV wing considering the CH10 airfoil. In this paper, the computational fluid dynamic analysis on CH10 cambered airfoil has been conducted to achieve the preliminary results on the aerodynamic lift and drag coefficients. The airfoil has a chord length of 1 meter and has been subjected to low Reynolds numbers of 500 000, which is the standard operating Reynolds number for UAV wing design. The C-type fluid domain has been constructed at 30C upstream and downstream of the airfoil to initialize the boundary conditions. The angle of attack ranging from 0° to 14° with the increment of 2° has been done by changing the direction of the freestream velocity. The aerodynamic characteristics have been numerically computed using Spallart-Allmaras and Transient SST models. The aerodynamic coefficients achieved by these two models have been validated based on the XFOIL data. The contours of static pressure and velocity magnitude at 0°, 5°, 10°, and 12° angle of attack have been portrayed. The static pressure distribution around the airfoil has been visually observed to analyze its influence on the aerodynamic coefficients. The velocity magnitude relation to the static pressure distribution has been approved based on Bernoulli's equation such that increasing velocity magnitude has decreased the static pressure. The present results show that the Transient SST model has shown better flow prediction for an airfoil subjected to low Reynolds numberflow.

Analysis of flows and prediction of CH10 airfoil for unmanned arial vehicle wing design

Aabid, Abdul,Khairulaman, Liyana Nabilah Binti,Khan, Sher Afghan Techno-Press 2021 Advances in aircraft and spacecraft science Vol.8 No.2

The unmanned aerial vehicle (UAV) is becoming popular from last two decades and it has been utilizing in enormous applications such as aerial monitoring, military purposes, rescue missions, etc. Hence, the present work focused on the design of the UAV wing considering the CH10 airfoil. In this paper, the computational fluid dynamic analysis on CH10 cambered airfoil has been conducted to achieve the preliminary results on the aerodynamic lift and drag coefficients. The airfoil has a chord length of 1 meter and has been subjected to low Reynolds numbers of 500 000, which is the standard operating Reynolds number for UAV wing design. The C-type fluid domain has been constructed at 30C upstream and downstream of the airfoil to initialize the boundary conditions. The angle of attack ranging from 0° to 14° with the increment of 2° has been done by changing the direction of the freestream velocity. The aerodynamic characteristics have been numerically computed using Spallart-Allmaras and Transient SST models. The aerodynamic coefficients achieved by these two models have been validated based on the XFOIL data. The contours of static pressure and velocity magnitude at 0°, 5°, 10°, and 12° angle of attack have been portrayed. The static pressure distribution around the airfoil has been visually observed to analyze its influence on the aerodynamic coefficients. The velocity magnitude relation to the static pressure distribution has been approved based on Bernoulli's equation such that increasing velocity magnitude has decreased the static pressure. The present results show that the Transient SST model has shown better flow prediction for an airfoil subjected to low Reynolds numberflow.

Does campus life policy bring out the dark side of university students` participation in sports? : Motivation for participation in intramural sports and its relations to subjective well-being

( Wai Cheong Eugene Chew ),( Nur Liyana Bte Hassim ) 한국체육학회 2016 국제스포츠과학 학술대회 Vol.2016 No.1

Purpose: Set against the social environmental context where university students desire to continue staying in the Halls of Residence is contingent on their active participation in campus life activities, this exploratory study examines the reasons that students have for participating in the Inter-Hall Games, and how autonomous and controlled motivation for participation relate to their subjective well-being. In addition, to understand the role of stress in student life, the relationship between stress and the students’ well-being is also examined. Method: In this exploratory cross-sectional study, a questionnaire was employed to survey 166 university students from ten Halls of Residence on the studied variables. Using multiple regression, the analysis examined if the data fitted the model linking the two types of motivation and stress with subjective well-being. Thematic analysis was used to analyse the qualitative data gathered from the open-ended question. Result: Autonomous motivation was found to positively predict subjective well-being while controlled motivation (albeit non-significant) and stress negatively predict subjective well-being. Results from the thematic analysis showed various motives for participating in the Inter-Hall Games that were associated with autonomous motivation. Gaining points for Hall admission was among the reasons cited that were classified as controlled motivation. Conclusion: University students’ motivation for participating in Intra-Hall Games largely remained autonomously driven even though there is an obligation to acquire points for securing a room in the Halls. It can be argued that the overall vibrant university sporting culture and the nature of sports may have a role in mitigating the effects of compulsion imposed by the Hall Admission policy. Although controlled motivation negatively predicted subjective well-being, it was statistically non-significant. Notwithstanding this, participating in the Inter-Hall Games to gain points for admission to the Halls was among the motives for participation cited by the students. Whether the obligation to gain points added to the stress that students faced, which was found to predict detrimental effects on students’ subjective well-being, was not investigated in the study. Further studies that specifically assess the effects of campus life policy on various student outcomes via potential mediators such as stress may shed more light on how students respond to such policies.

Molecular characterization of antimicrobial-resistant Citrobacter freundii isolated from pet turtles in Korea

Masimbule Vidanalage Kasun Sameera Wickramanayake,Liyana Arachchilage Dinithi Sandunika De Silva,허강준 한국예방수의학회 2022 예방수의학회지 Vol.46 No.3

This study is intended to determine the antimicrobial resistance properties and class 1 integrons of 30 Citrobacter freundii strains isolated from pet turtles in order to determine their threat to human health. Citrobacter freundii isolates were isolated and identified by employing biochemical tests and 16SrRNA gene sequencing. Disc diffusion test and PCR amplification were employed to detect antimicrobial resistance patterns and genes, respectively. Ampicillin, amoxicillin, cephalothin and nalidixic acid resistance were observed among all isolates. Rifampicin and cefoxitin resistance was the second most prevalent and observed in 97% of the isolates, respectively. All isolates scored multiple antimicrobial resistance (MAR) indices ≥ 0.2. Aminoglycoside resistant genes were the most prevalent. aac(3')-IIa was detected in 80% of the isolates followed by aphAI-IAB and strA-strB genes in 33% and 50% of the isolates, respectively. β-lactamase encoding blaTEM, blaCTX and blaSHV genes were detected in 53%, 43% and 17% of the isolates, respectively. tetA and tetB genes were the only tetracycline resistance genes detected in 17% and 10% of the isolates, respectively. Class 1 integron integrase encoding intI1 gene (47%) and dfrA17-aadA5 gene cassette array (7%) were also detected. Pet turtle-borne multidrug-resistant C. freundii is a reservoir of antimicrobial resistance determinants in the domestic environment which poses a risk of infection.