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Optimal decision for two dimensional maintenance service contract involving three parties

Journal of Physics: Conference Series 2019年第1期1245卷

作者： Nur F Sa'idah Andi Cakravastia Udjianna S Pasaribu Bermawi P Iskandar Doctoral Program in Industrial Engineering and Management ITB Ganesha 10 Department of Industrial Engineering ITB Ganesha 10 Bandung Indonesia Department of Mathematics ITB Ganesha 10 Bandung Indonesia

A two-dimensional (i.e. time and use) maintenance service contract involving three parties i.e. manufacturer, agent and consumer are considered in this paper. The contract period by the manufacturer/agent begins since the warranty expires (W) until the lifetime of the equipment expires (L). The use of equipment by consumer is modeled with accelerated failure time (AFT) model. AFT model specifies the limit value of permitted equipment usage (Ul ). The contract time is limited to t = L, but equipment usage may exceed U l . High use of equipment will increase consumer revenue. However, the consumer will incur additional costs paid to the manufacturer/agent if the use of equipment exceeds U l . Therefore, consumers will seek the optimum value of use (U) that maximizes the profits. As with consumer, manufacturer and agent also want to maximize their profits. Decision problems in maintenance service contracts involving the three parties will be resolved consider the interaction of the manufacturer and the agent in carrying out maintenance action. One level optimization used if the manufacturer and agent compete with each other. However, if the manufacturer and agent interact in a cooperation, then optimization of the decision model becomes more difficult and should be done with bilevel optimization.

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Polymer of chitosan with ZnO addition to optimize high responsivity and sensitivity in sensor film

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AIP Conference Proceedings 2020年第1期2267卷

作者： Saisa H. Agusnar Z. Alfian I. Nainggolan 1Doctoral Program Department of Chemistry Faculty of Mathematics and Natural Science Universitas Sumatera Utara Medan 20155 North Sumatera Indonesia 2Department of Chemical Engineering Faculty of Engineering Universitas Serambi Mekkah Banda Aceh 23245 Aceh Indonesia 3Department of Chemistry Faculty of Mathematics and Natural Science Universitas Sumatera Utara Medan 20155 North Sumatera Indonesia

Coating of polymer chitosan as sensor film on copper electrode substrate (Cu) has become a concern of research development to improve responsivity, sensitivity, and economic value to detect hazardous preservatives in food, especially formalin. This study aims to enhance the activities of sensor for more responsive and higher sensitivity by adding metal oxide as an active agent. Chitosan thin film is prepared by 1.5% chitosan dissolved with 2% acetic acid and modified with active compound ZnO. The addition of ZnO NPs metal oxide is to improve sensitivity which viewed from SEM characterization results, the surface of morphology is smoother and flat on the surface of chitosan. Characterization of FT-IR showed ZnO was perfectly bound to amine bond of chitosan structure. The research method was conducted by cyclic voltammetry analysis to find out the results test of sensor sensitivity. The results showed chitosan-ZnO film sensor provides the best sensitivity on modification conditions of ZnO NPs 0.6% and 0.8%. Linearity analysis of sensor provides ideal value obtained at R-square value of 0.9886. Thus, it can be concluded that chitosan-ZnO thin-film sensor is hugely responsive to be used as an electrode sensor for detecting hazardous chemical compounds in food. Chitosan-ZnO film sensor can provide high activity as a biosensor electrode for detecting harmful compounds in foods that are sensitive, responsive, and has economic value.

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Assessment on Improvement of Early Detection Systems in Electrical Rooms of High-Tech Facilities

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Procedia engineering 2018年 211卷 235-246页

作者： Yu-Jen Chen Chi-Min Shu San-Ping Ho Hsin-Hsiu Ho Hue-Pei Chang Doctoral Program Graduate school of Engineering Science and Technology National Yunlin University of Science and Technology Douliou Yunlin Taiwan 64002 Department of Safety Health and Environmental Engineering YunTech Douliou Yunlin Taiwan 64002 Department of Occupational Safety and Health Chang Jung Christian University Tainan Taiwan 71101

Past air sampling detection (ASD) systems had no definitive positioning; most allocation of sampling points was based on experience. This research discovered that sampling points inside the electrical rooms were significantly affected by the ambient airflow, causing the detection system to have difficulties in fire detection. Fire dynamics simulator (FDS) was used to simulate very early smoke detection apparatus (VESDA) effectiveness within the protection area of an electrical room. Results showed that ASD sampling points in electrical rooms should be placed above high-voltage transformers and capacitors, while rearranging the high risk machines together to avoid long detection pipelines, which increases the transportation time of the gas, thus hindering early detection by the ASD system. Field tests using a smoke detector tester yielded transportation times of 33 s, which was in very good agreement with the simulated results of 35 s by ASPIRE, showing the accuracy of using software to simulate transportation times. Therefore, this research combined FDS with the transportation times of different pipeline designs to conduct performance assessment of VESDA. After appropriate rearrangement of machines, VESDA detection times dropped from 106.0–171.0 s during the original setup to 21.0–31.7 s, assuring the facility to have more time for emergency response. However, it was noticed that FDS software did not have the estimation tool for VESDA transportation times; therefore software such as ASPIRE should be used to calculate the gas transportation times inside the detection pipelines, and then compiled with FDS results to avoid underestimation of actuation times.

关键词： electrical rooms transportation time fire dynamics dimulator vesda aspire

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Flood Control Reduction Analysis using HEC-RAS due to Local Floods in Central Jakarta

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IOP Conference Series: Materials Science and engineering 2020年第1期879卷

作者： V Pratiwi B P Yakti B E Widyanto Doctoral Program of Civil Engineering Civil and Environmental Engineering Faculty Institut Teknologi Bandung Jl. Ganesha 10 Bandung Indonesia Civil Engineering Department Computer Sciences and Engineering Faculty Universitas Komputer Indonesia Jl. Dipati Ukur 112-116 Bandung Indonesia Center for Water Resources Development Institute for Research and Community Services Institut Teknologi Bandung Jl. Ganesha 10 Bandung Indonesia Civil Engineering Department Engineering Faculty Universitas Widyatama Jl. Cikutra No. 204 A Bandung Indonesia

There are two types of floods in Jakarta: upstream flooding and local flooding. In general, floods in DKI Jakarta are caused by local floods. The main cause of this flood is the occurrence of high rainfall, poor drainage system, and land subsidence. This study will analyse the local flood that occurred in Gunung Sahari, Central Jakarta. Judging from the existing conditions, sedimentation occurs in the drainage channels. This sedimentation causes a reduction in the existing channel capacity. Based on a hydrological and channel capacity analysis, the existing drainage channels are designed based on annual rainfall i.e. return period 1-2 years, which is 133.10 mm/day. Flood modelling is done for existing conditions. Based on the results of modelling, floods that occur in locations between 50 cm - 100 cm. Due to dense housing conditions, widening and normalizing the channel is difficult. Therefore, flood reduction will be assisted by pumps. The pump will be installed in the downstream of the main drain, which is connected to Mati River. This pump is designed with a capacity of 0.5 m3 / sec. Based on the results of modelling, with a largest pump capacity of 0.5 m3/sec, flooding is only reduced by 5 cm - 7 cm. Due to the lack of effectiveness of the pump, retention ponds will be designed to reduce surface runoff. Retention ponds are designed with an area of 1 ha and a depth of 1.5 m. Modelling is done in the presence of a retention pond. With the addition of retention ponds, annual flooding for the 2-year return period on Gunung Sahari could be reduced. Therefore, the discharge that will be received by the drainage channel will be smaller than the capacity of the channel itself and the flood will be completely reduced.

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Potential environmental pressures on water availability in Gembong reservoir in Pati District for the development of agropolitan area

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Journal of Physics: Conference Series 2019年第1期1217卷

作者： Kartono Purwanto Suripin Doctoral Program in Environmental Sciences School of Postgraduate Studies Diponegoro University Semarang-Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang-Indonesia Department of Civil Engineering Faculty of Engineering Diponegoro University Semarang-Indonesia

Land-use management is the key parameter in developing an agropolitan area. The Spatial Plan of Pati District 2010-2030 contains plans for the Gembong Subdistrict to be developed into an agropolitan area. The Gembong Reservoir is one of the reservoirs in the region that has a vital role in supporting the area development. The main problem in managing the Gembong reservoir is the decreasing availability of reservoir water. Increased sedimentation affects the availability of reservoir water, which is used as a supply of irrigation areas. Management of water availability must be based on optimization analysis, because the volume of storage is limited and increasing inflow to the reservoir to increase the water level requires a long time. Therefore, the optimization model of reservoir water management is urgent to be formulated, so that the reservoir operator can be utilized to determine the allocation of supplementary water. This article presents a study of the results of observations in the field and secondary data, as well as reviews of related scientific articles, to be able to identify potential environmental stresses on reservoir water availability and its management.

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Human Papillomavirus Infection Increases Risk of New-Onset Prurigo Nodularis: A Multi-Center Retrospective Cohort Study Using Global and US Electronic Medical Records of TriNetX network

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Journal of the American Academy of Dermatology 2025年

作者： Shuo-Yan Gau Shao-Wei Lo Yung-Fang Tu Wen-Chieh Liao Yu-Jung Su Hui-Chin Chang Torsten Zuberbier Martin Metz Shiu-Jau Chen Department and Graduate Institute of Business Administration National Taiwan University Taipei Taiwan Evidence-based Medicine Center Chung Shan Medical University Hospital Taichung Taiwan Department of Pharmacology Chung Shan Medical University Taichung Taiwan Harvard T.H. Chan School of Public Health Boston Massachusetts USA Department of Biostatistics Harvard T.H. Chan School of Public Health Boston Massachusetts USA Department of Post-Baccalaureate Medicine College of Medicine National Chung Hsing University Taichung Taiwan Doctoral Program in Tissue Engineering and Regenerative Medicine College of Medicine Taichung Taiwan Orthopedics Department Chi-Mei Medical Center Tainan Taiwan School of Medicine Chung Shan Medical University Taichung Taiwan Library Chung Shan Medical University Hospital Taichung Taiwan Institute of Allergology Charité-Universitätsmedizin Berlin Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin Berlin Germany Fraunhofer Institute for Translational Medicine and Pharmacology Immunology and Allergology Berlin Germany Department of Neurosurgery Mackay Memorial Hospital Taipei Taiwan Department of Medicine Mackay Medical College New Taipei City Taiwan

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Mechanical Properties, Morphology and Thermal Degradation of PCL (Poly ε - Caprolactone) Biodegradable Polymer Blended Nanocomposites with Aceh Bentonite as Filler

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IOP Conference Series: Materials Science and engineering 2019年第1期536卷

作者： Ridwan Basuki Wirjosentono Tamrin Teuku Rihayat Doctoral program of Chemistry Faculty of Mathematics and Natural ScienceUniversitas Sumatera Utara. Departement of Chemical Engineering Politeknik Negeri Lhokseumawe Departement of Chemistry Universitas Sumatera Utara

Polycaprolactone (PCL) is an important polymer due to its mechanical properties, miscibility with a large range of other polymers and biodegradability. Polycaprolactone (PCL) was chosen as the matrix because of its biodegradability characteristics. This paper reports on an investigation of the influence of the presence of bentonite. It was found that of bentonite significantly influenced the mass loss behavior of the nanocomposite because of physical interactions between the clay and the polymer chains and degradation volatiles. Melt drawing of the composite, however, had little influence on the degradation behavior of the investigated samples. Based on mechanical properties results, addition of bentonite significantly enhances the flexibility of PCL blends. TGA showed that the presence of bentonite improves thermal stability of blends.

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The investigation of influence ammonia concentration variations to the performance of a pump less ammonia-water absorption refrigeration system with water flooding evaporator

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AIP Conference Proceedings 2019年第1期2062卷

作者： Hendra Wijaksana I. N. S. Winaya Made Sucipta Ainul. Ghurri 1)Doctoral Study Program in Engineering Science Udayana University Kampus Jendral Sudriran Denpasar Bali-Indonesia 2)Mechanical Engineering Department Engineering Faculty Udayana University Kampus Bukit Jimbaran Denpasar Bali-Indonesia

An experimental investigation of the influences ammonia concentration variation to the performances of pump less ammonia-aqua absorption refrigeration system with water flooding evaporator is described. The heat generated in generator and refrigerating effect in evaporator, cooling capacity, coefficients of performance (COP) are investigated. The objective of this study is to investigate the characteristic and influences of the ammonia concentration variation to the performance of pump less absorption refrigeration system with water flooding evaporator as a refrigeration load.. In this research, the generator temperature has been setting constant in 80°C using electric heater, the ammonia concentration in 500 ml solution would be varied in 18%, 27%, 37%, 47%, and 59%. It is concluded that heat generated in generator and refrigerating effect in evaporator decrease with increasing ammonia concentration, while the cooling capacity and COP would increase with increasing ammonia concentration. As a result, it is found that increasing the ammonia concentration would effect on increasing of cooling capacity and COP. The highest the ammonia concentration, the highest cooling capacity and COP would be resulted. The highest cooling capacity and COP resulted respectively are 0.7180 kW and 0.829 at 59% ammonia concentration.

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Mangrove Conservation Opportunity at Southern Coast of Bangkalan-East Java, Indonesia

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IOP Conference Series: Earth and Environmental Science 2020年第1期557卷

作者： M K Wardhani D M Rosyid H D Armono Doctoral Program Department of Ocean Engineering Faculty of Marine Technology Institut Teknologi Sepuluh Nopember Kampus ITS Sukolilo Surabaya 60111 Indonesia Department of Marine Science Faculty of Agriculture Trunojoyo University Madura Raya Telang PO BOX 2 Kamal Bangkalan 69162 Indonesia Department of of Ocean Engineering Faculty of Marine Technology Institut Teknologi Sepuluh Nopember Kampus ITS Sukolilo Surabaya 60111 Indonesia

Mangrove ecosystems are resources of landscapes, flora, fauna, and local communities that interact with each other. Mangrove ecosystems have important ecological, economic and social functions for coastal development. Conservation is a means of involving the community in mangrove recovery and management activities as a preservation effort. This paper examines the potential of mangrove ecosystems in the southern coast of Bangkalan as a conservation area. The fact, mangrove ecosystems have a pressure that decreased area significantly. Data collection used the quadratic transect method and satellite image analysis. Mangroves on the southern coast of Bangkalan have increased area over the past 10 years. Mangrove vegetation found consisted of 4 families and 8 species. There are also found fauna i.e. insects, snakes, primates and birds. The observations indicated that conservation of mangrove forests on the southern coast of Bangkalan needs to be done. This effort can be supported by ecotourism activities which are expected to improve the community welfare.

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Implementation of Fuzzy-based Model for Prediction of Thalassemia Diseases

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Journal of Physics: Conference Series 2021年第1期1751卷

作者： E. R. Susanto A. Syarif K Muludi R. R. W. Perdani A. Wantoro Doctoral Program of Mathematics and Science Faculty Lampung University. Jl. Sumantri Brojonegoro No 1 Bandar Lampung Indonesia. Faculty of Engineering and Computer Science Universitas Teknokrat Indonesia. Jl. ZA. Pagaralam No.9-11 Bandar Lampung Indonesia. Department of Computer Science Faculty of Mathematics and Science University of Lampung. Jl. Sumantri Brojonegoro No 1 Bandar Lampung Indonesia. Faculty of Medical Science Lampung University. Jl. Sumantri Brojonegoro No 1 Bandar Lampung Indonesia

Thalassemia is known as one of the blood disorder diseases that is inherited by parents. There are several types of Thalassemia, namely as Thalassemia major, minor, and intermedia. Among them, Thalassemia major is the most dangerous and needs more attention. Generally, it can be detected since the child is one year old. Late detection of this disease can have adverse consequences and various complications. This study aims to develop a new model for the prediction of thalassemia for children. The model adopts a fuzzy-based rule. The novelty in this article is that our model has 4 outputs, namely thalassemia major, intermedia, minor and not thalassemia. In the previous article it only had 3 outputs. In this study, we intend to implement a model that we developed using a fuzzy-based approach to classify thalassemia diseases based on CBC data. This article describes how to build a model and implement it in software. We compare the test results with the opinion of pediatricians regarding thalassemia. The final results of testing 4 CBC data show that our proposed model has successfully identified the type of thalassemia.

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