Current Situation of Abandoned Landfills in Indonesia

Marisa Mei Ling,Jun Boum Park 한국폐기물자원순환학회 2009 한국폐기물자원순환학회 학술대회 Vol.2009 No.1

Abandoned Landfills in Indonesia and Their Problems

Marisa Mei Ling,박준범 한국지하수토양환경학회 2009 지하수토양환경 Vol.14 No.3

This paper presents current condition of landfills in Indonesia and the problems exist. It also presents a review of study on abandoned landfill in Bandung, West Java where the actual problems can be seen and an insight to the solutions were developed. This paper presents current condition of landfills in Indonesia and the problems exist. It also presents a review of study on abandoned landfill in Bandung, West Java where the actual problems can be seen and an insight to the solutions were developed.

Experimental behaviour of composite beams subjected to a hogging moment

Marisa Pecce,Fernando Rossi,Fabio Antonio Bibbò,Francesca Ceroni 국제구조공학회 2012 Steel and Composite Structures, An International J Vol.12 No.5

The present work addresses the rotational capacity of steel-concrete composite beams, which is a key issue for the seismic design of composite frames. Several experimental tests from the literature are summarised, and the effects of various parameters on the available plastic rotation are discussed. Furthermore, a number of remarks are made regarding the need for supplementary experimental results. The authors carried out experimental tests on four composite beams in which the type, width and connection degree of the slab were varied. During the tests, the deflection and strains in the steel profiles and bars were measured and recorded, wherein the observed trends in the measured parameters indicated that the failure mode of the beam was influenced by global and local buckling. A comparison of the experimental results to the theoretical ultimate strengths and moment-curvature relationships confirms that buckling phenomena occurred after section yielding, even if a consistent plastic rotation developed. This rotational capacity is well evaluated by a formulation that is available in the literature.

Customer requirement system for vehicle product development plan By KANO`s model and QFD

( Marisa Germprapai ),( Natcha Thawesaengskulthai(ph. D. ) ) 한국품질경영학회 2015 한국품질경영학회 학술대회 Vol.2015 No.2

Purpose- The global automotive industry□s trend is continually growing with high competition including automotive industry in Thailand. Thus the dynamic of automotive business is required to continuously develop new product and to meet new customer□s voice. This research proposes a new methodology to analyze customer requirements for vehicle product plan by modified Kano□s model and Quality Function Deployment (QFD). Moreover, the results can provide guidance for product development plan and offer useful to future vehicle design for research and development department. Methodology - The research starts by collecting requirements from the customers who bought new car models: eco car and sport utility vehicle (SUV) model with mileage not over 30,000 kilometers and normal usage. The total of 300 customers in Thailand were collected during November 2014 to January 2015. In addition, warranty data were collected from the global claim data of a case company during January to December in 2014. Exterior and interior categories are separated between problems and expectations of requirement. The quality attributes of Kano□s questions were designed and analyzed by customer satisfaction coefficient to categorize and prioritize their importance. Furthermore, the data was analyzed by adjust improvement ratio which used in a section of important customer requirement into house of quality. The data was construed thought the QFD. Moreover, risk evaluation were combined to provide extra information of the high risk items for an effective decision. Result from the approach provides developmet plan which suggest to research and development department of the future vehicle design. Finally, we tested the acceptance and satisfaction rate of the new vehicle development plan from the factory staff and managers. Findings- An integration of QFD with the modified Kano□s model was applicable to develop an effective customer requirement system that helps vehicle development plan□s decision. Kano□s question is used to classify the vital design elements that cause satisfaction and dissatisfaction of customers. The three ranking attributes of first priority were (1) need assist grip at front trim pillar, (2) need more cup holder and (3) need engine start. QFD was applied to transform the quality attributes to product development plan. The customer requirement system was evaluated from staff and manager of a case company. The result found that the average of overall satisfaction is at 78.4%, the average of feasibility is at 86.2%, the average of usability is at 74.6% and the average of utility is at 78.9%. A case study company agreed and accepted customer requirement system with modified Kano□s model and QFD technique for satisfaction surveys in fiscal year 2015. Research implication - The varied customer requirement is difficult to consider and discuss for the new or improve product. The result obtained a better prioritization plan for improving product/service attribute performance. These profoundly analyzed customer requirements are then conducted into the QFD process which provides guidance for product development plan and offer useful for future vehicle design. Moreover, the acceptance and satisfaction rate of customer requirement system for vehicle product development plan were measured with questionnaires from the staff and manage at the case company. Originality /Values- The paper proposed a new method in collecting and analyzing customer requirements to decision-making for future vehicle product by using the Kano□s model and QFD. In addition, customer requirements are priority evaluated by the importance grid to provide a holistic view to ease the discussions for improvement planning. The dynamic of automotive business is required to continuously develop new product and to meet new customer requirements.

Optimization of Medium for Lipase Production from Zygosaccharomyces mellis SG1.2 Using Statistical Experiment Design

( Marisa Dian Pramitasari ),( Miftahul Ilmi ) 한국미생물 · 생명공학회 2021 한국미생물·생명공학회지 Vol.49 No.3

Lipase (triacylglycerol lipase, EC 3.1.1.3) is an enzyme capable of hydrolyzing triacylglycerol, to produce fatty acids and glycerol and reverse the reaction of triacylglycerol synthesis from fatty acids and glycerol through transesterification. Applications of lipase are quite widespread in the industrial sector, including in the detergent, paper, dairy, and food industries, as well as for biodiesel synthesis. Lipases by yeasts have attracted industrial attention because of their fast production times and high stability. In a previous study, a lipase-producing yeast isolate was identified as Zygosaccharomyces mellis SG1.2 and had a productivity of 24.56 U/mg of biomass. This productivity value has the potential to be a new source of lipase, besides Yarrowia lypolitica which has been known as a lipase producer with a productivity of 0.758 U/mg. Lipase production by Z. mellis SG1.2 needs to be increased by optimizing the production medium. The aims of this study were to determine the significant component of the medium for lipase production and methods to increase lipase production using the optimum medium. The two methods used for the statistical optimization of production medium were Taguchi and RSM (Response Surface Methodology). The data obtained were analyzed using Minitab 18 and SPSS 23 software. The most significant factors which affected lipase productivity were olive oil and peptones. The optimum medium composition consisted of 1.02% olive oil, 2.19% peptone, 0.05% MgSO₄·7H₂O, 0.05% KCl, and 0.2% K₂HPO₄. The optimum medium was able to increase the lipase productivity of Z. mellis SG1.2 to 1.8-fold times the productivity before optimization.

Current Situation of Abandoned Landfills in Indonesia

( Marisa Mei Ling ),( Jun Boum Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2009 한국폐기물자원순환학회 추계학술발표논문집 Vol.2009 No.1

Review : Artificial Sweeteners: A Systematic Review and Primer for Gastroenterologists

( Marisa Spencer ),( Amit Gupta ),( Lauren Van Dam ),( Carol Shannon ),( Stacy Menees ),( William D Chey ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2016 Journal of Neurogastroenterology and Motility (JNM Vol.22 No.2

Artificial sweeteners (AS) are ubiquitous in food and beverage products, yet little is known about their effects on the gastrointestinal (GI) tract, and whether they play a role in the development of GI symptoms, especially in patients with irritable bowel syndrome. Utilizing the PubMed and Embase databases, we conducted a search for articles on individual AS and each of these terms: fermentation, absorption, and GI tract. Standard protocols for a systematic review were followed. At the end of our search, we found a total of 617 eligible papers, 26 of which were included. Overall, there is limited medical literature available on this topic. The 2 main areas on which there is data to suggest that AS affect the GI tract include motility and the gut microbiome, though human data is lacking, and most of the currently available data is derived from in vivo studies. The effect on motility is mainly indirect via increased incretin secretion, though the clinical relevance of this finding is unknown as the downstream effect on motility was not studied. The specific effects of AS on the microbiome have been conflicting and the available studies have been heterogeneous in terms of the population studied and both the AS and doses evaluated. Further research is needed to assess whether AS could be a potential cause of GI symptoms. This is especially pertinent in patients with irritable bowel syndrome, a population in whom dietary interventions are routinely utilized as a management strategy. (J Neurogastroenterol Motil 2016;22:168-180)

Abandoned Landfills in Indonesia and Their Problems

Ling, Marisa Mei,Park, Jun-Boum Korean Society of Soil and Groundwater Environment 2009 지하수토양환경 Vol.14 No.4

This paper presents current condition of landfills in Indonesia and the problems exist. It also presents a review of study on abandoned landfill in Bandung, West Java where the actual problems can be seen and an insight to the solutions were developed.

Self-Reported Variables as Determinants of Upper Limb Musculoskeletal Symptoms in Assembly Line Workers

Guerreiro, Marisa M.,Serranheira, Florentino,Cruz, Eduardo B.,Sousa-Uva, Antonio Occupational Safety and Health Research Institute 2020 Safety and health at work Vol.11 No.4

Background: Assembly lines work is frequently associated to work-related upper limb musculoskeletal disorders. The related disability and absenteeism make it important to implement efficient health surveillance systems. The main objective of this study was to identify self-reported variables that can determine work-related upper limb musculoskeletal symptoms-discomfort/pain-during a 6-month follow-up. Methods: This was a prospective study with a 6-month follow-up period, performed in an assembly line. Upper limb musculoskeletal discomfort/pain was assessed through the presence of self-reported symptoms. Uni- and multivariate logistic regression analyses were used to evaluate which self-reported variables were associated to upper limb symptoms after 6 months at the present and to upper limbs symptoms in the past month. Results: Of the 200 workers at baseline, 145 replied to the survey after 6 months. For both outcomes, "having upper limb symptoms during the previous 6 months" and "education" were possible predictors. Conclusion: Our results suggest that having previous upper limb symptoms was related to its maintenance after 6 months, sustaining it as a specific determinant. It can be a hypothesis that this population had mainly workers with chronic symptoms, although our results give only limited support to self-reported indicators as determinants for upper limb symptoms. Nevertheless, the development of an efficient health surveillance system for high demanding jobs should implicate self-reported indicators, but also clinical and work conditions assessment should be accounted on the future.

Spatial and Temporal Analysis of Land-use Changes Associated with Past Mining in the Kitakyushu District, Japan

이성수,박준범,Marisa Mei Ling 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.4

In the beginning of 20th century, the coal mining industry had an important role in Japan at which two-thirds of the coal product came from the Kitakyushu-Chikuho District (KCD). As a consequence of mining activities, land-use condition in this district showed notable changes. This paper presented a study of land-use changes in coal mining area by characterizing land-use pattern transition over the last 100 years. In order to carry out the rigorous analysis of land-use, a series of land-use maps over the last 100 years was developed using geographic information systems (GIS). The historic topographic map and another available old data were used to investigate the long-term changes of land-use associated with past mining within the GIS platform. The results showed that the utilization of a series of developed land-use maps successfully indicated the difference of land-use pattern in the KCD before and after the peak of mining activities. The general findings from land-use analysis described that forest and farm lands were lost and turned into abandoned sites in the last 100 years.