Theory of Computing Systems \/ Mathematical Systems Theory最新文献

{"title":"An Exploratory Study of Sukuk Utilisation for Transportation Infrastructure Development in Indonesia","authors":"F. Lamari, A. Rarasati, Meilia Evita","doi":"10.7454/MST.V22I1.3581","DOIUrl":"https://doi.org/10.7454/MST.V22I1.3581","url":null,"abstract":"Investment in infrastructure is one of the principa l drivers of the growth of the economy. For that r eason, the Indonesian government has proposed an investment bu dget in the railway and sea and air transport secto rs over the next 10 years. In order to overcome the burden of direc t outflows and for the future, a study was conducte d to lay down the framework of Shariah-compliant payments for the dev elopment of infrastructure in Indonesia in the tran sport sector. This paper aims to explore the opportunity and impl ementation of sukuk utilisation to develop transportation infrastructure. Secondary data study and interviews were selected for the basic research method. This study presents the practice of sukuk implementation in transportation projects. Six tra nsportation projects are also described to gain ins ight of the utilisation shariah-compliant financing sche me.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"9 1","pages":"53-59"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84602137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent Advances on Physical Layer Security for Wireless Communications","authors":"Galagarza Martinez, E. Stevens","doi":"10.17760/d20291186","DOIUrl":"https://doi.org/10.17760/d20291186","url":null,"abstract":"of the Thesis Recent Advances on Physical Layer Security for Wireless Communications by Edson Stevens Galagarza Martinez Master of Science in Electrical and Computer Engineering Northeastern University, April 2018 Dr. Edwin A. Marengo Fuentes, Advisor Wireless communications are naturally exposed to important security risks due to their broadcast nature. In contrast with wired communications, no physical medium is isolating the transmission surroundings to a specific path. Traditional methods to reach the goals of communications security rely on algorithms at protocol stack level, which are based on mathematically derived cryptographic protocols. With the tremendous proliferation of wireless devices, and the increase in computational power available for decryption, traditional cryptographic measures may be compromised. To protect communications at the lowest level, physical layer (PHY) security methods have been proposed recently. These techniques aim to ensure secure communications by exploiting the unique characteristics of the physical medium between communicating nodes, effectively reducing the decryption capabilities of an eavesdropper to intercept transmissions. This thesis explains within a general framework the most important PHY layer security schemes. First we explore approaches which utilize the knowledge of the unique channel between communicating nodes to distort a transmitted signal with various kinds of randomizations, in such a way that the intended receivers are unaffected by the distortion, but any other observer will be exposed to it. These techniques, however, introduce several trade-offs between transmission resources and the effectiveness in achieving secrecy. Of particular interest for this investigation is a class of methods which can be referred to as ‘security enhancing techniques’, in which minimal priors about the potential eavesdroppers locations and capabilities are assumed. In this thesis, a wave-based approach to the communication secrecy problem is introduced. An interesting perspective is provided by studying the relation between electromagnetic theory and information theory, the so-called electromagnetic information theory. This allows to properly identify the unavoidable limitations imposed by the laws of electromagnetics to our ability to communicate securely. The proposed model can be extended to the analysis of different signal distortion methodologies and different channel conditions. The","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"81 1","pages":"27"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85498340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Small-signal-stability enhancement using a power-system stabilizer based on the cuckoo-search algorithm against contingency N-1 in the Sulselrabar 150-kV system","authors":"M. Djalal, M. Y. Yunus, H. Setiadi, A. Krismanto","doi":"10.7454/MST.V22I1.3497","DOIUrl":"https://doi.org/10.7454/MST.V22I1.3497","url":null,"abstract":"Small-signal stability is one of the main factors limiting power transmission in conventional power systems. This concern is primarily handled by adding damper windings of a synchronous generator and power-system stabilizer (PSS). However, due to the impact of the N-1 contingency, damper windings and a conventional PSS are insufficient to overcome this problem. Proper placement and design of the PSS are crucial for improving stability. One approach to optimizing the placement and tuning of the PSS is to use an artificial-intelligence method. Here, the cuckoo-search algorithm (CSA) is proposed to optimize the PSS tuning and placement. Based on simulation, it is found that a PSS based on the CSA can enhance the system's small-signal stability. The critical, local, and inter-area modes of the investigated system improve significantly. The oscillatory condition is more highly damped, as indicated by a smaller overshoot and faster settling time. It is also found that the CSA can be used to tune the PSS parameter under an N-1 contingency. From the analytical results of the N-1 contingency condition, optimal tuning of the PSS parameters was obtained, resulting in PSS-placement options for generators 1 to 7 and 12 to 15, producing a minimum damping of 0.611.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"11 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90565322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prerequisites for Public Acceptance of Waste-to-Energy Plants: Evidence from Germany and Indonesia","authors":"U. Lahl, B. Zeschmar-Lahl","doi":"10.7454/MST.V22I1.3555","DOIUrl":"https://doi.org/10.7454/MST.V22I1.3555","url":null,"abstract":"Construction of waste incinerators often encounters resistance from the public. The minimum requirements for the acceptance of these installations include modern air pollution control (APC) technology and safe disposal of residues. Confidence in the statements of government and government agencies as well as on those who support is an important point of acceptance. Independent scientific bodies such as universities can help to make this happen. In the case of the installation of waste into energy (WtE), such scientific support can be the measurement of emissions and their evaluation. Many products that enter the waste stream contain heavy metals, persistent organic pollutants, and other harmful substances. Their presence constitutes another challenge for recycling. This challenge can be solved most likely by binding specifications for chemicals in and design for recycling of products.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"83 1","pages":"17-27"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84273333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural and Photoluminescence Properties of ZnO Thin Films Deposited by Ultrasonic Spray Pyrolysis","authors":"I. Sugihartono, E. Handoko, V. Fauzia, Artoto Arkudato, Lara Permata Sari","doi":"10.7454/MST.V22I1.3423","DOIUrl":"https://doi.org/10.7454/MST.V22I1.3423","url":null,"abstract":"Zinc oxide (ZnO) thin films on a silicon (Si) (111) substrate were grown herein using ultrasonic spray yrolysis at 450 °C with different Zn concentrations. The ZnO thin f lms had X-ray diffraction patterns of a polycrysta lline hexagonal wurtzite structure. The (002) and (101) peak intens i ies changed under different Zn concentrations. Fu rthermore, according to Scherer's and Stokes–Wilson equations, the crystallite size and the internal strain of th e ZnO thin films in the (002) and (101) peaks changed with the Zn conce ntration. Optically, the photoluminescence spectra indicated that the ratio of the UV/GB emission of the ZnO thin fil ms was the highest at the Zn concentration of 0.02 mol/mL. We predicted that by increasing the Zn concentrations, the nonradiative transitions, which originated fro m defects, such as lattice and surface defect, become dominant. In con clusion, the ZnO thin films with the Zn concentrati on of 0.02 mol/mL had a better crystalline and optical quality .","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"17 1","pages":"13-16"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82575585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hybrid Brain-Computer Interface: a Novel Method on the Integration of EEG and sEMG Signal for Active Prosthetic Control","authors":"R. Darmakusuma, A. Prihatmanto, A. Indrayanto, T. Mengko","doi":"10.7454/MST.V22I1.3103","DOIUrl":"https://doi.org/10.7454/MST.V22I1.3103","url":null,"abstract":"This paper describes a novel method for controlling active prosthetics by integrating surface electrom y graphy (sEMG) and electroencephalograph signals to improve its in tuit veness. This paper also compares the new metho d (RTA-2) with other existing methods (AND and OR) for controlling active prosthetics. Based on analysis, RTA-2 featu r s higher true positive rate (TPR) and balanced accuracy (BA) than AND method. On the other hand, the new method (RTA -2) yields lower false detection rate (FPR) than OR method. An alysis also shows that RTA-2 possesses equal TPR, F and BA with the detection of movement intention using sEMG -based system. Although the RTA-2 method shows equa l performance with the sEMG-based system, it presents an advantage for driving active prosthetics to mov e faster and to reduce its total time response by generating more m ove ent commands.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"11 1","pages":"28-36"},"PeriodicalIF":0.0,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84197298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Computational Investigations on the Aerodynamics of a Generic Car Model in Proximity to a Side-Wall","authors":"M. Uddin, Srivatsa Mallapragada, Adit Misar","doi":"10.4271/2018-01-0704","DOIUrl":"https://doi.org/10.4271/2018-01-0704","url":null,"abstract":"","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"9 1","pages":"52"},"PeriodicalIF":0.0,"publicationDate":"2018-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87155999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isolation and Molecular Weight Characterization of Tetragonula laeviceps Honey Protein","authors":"M. Sahlan, Nurul Azizah, Kazuaki Hakamada, K. Noguchi, M. Yohda","doi":"10.7454/MST.V22I1.3363","DOIUrl":"https://doi.org/10.7454/MST.V22I1.3363","url":null,"abstract":"The concentration of protein in honey is lower than polysaccharide. However, recently the honey’s prot ein is intensively studied and it showed that protein also have several biolo g cal activities such as antibacterial activity. Th e purpose of this research is to isolate and characte rize Tetragonula laeviceps honey protein by determining the molecular weight. Honey protein of Trigona laeviceps was isolated using ultra-filtration with the membra ne’s size of 30 kDa, then concentrated using tube membrane size 10 kDa. Molec ular weight was analyzed by SDS PAGE. From the anal ysis, there was major protein band in honey produced by Tetragona laeviceps identified. The produced molecular weight of major protein bands were about 87 and 65 kDa. Deter mining of the molecular weight of this protein coul d be used to detect the originality of Tetragonula laeviceps honey from Indonesia.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"39 1","pages":"9-12"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84654643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy Potentials of Briquette Produced from Tannery Solid Waste","authors":"O. A. Oyelaran, F. M. Sani, O. Sanusi, Olusegun Balogun, A. O. Fagbemigun","doi":"10.7454/MST.V21I3.3429","DOIUrl":"https://doi.org/10.7454/MST.V21I3.3429","url":null,"abstract":"The vast quantity of waste generated from industries is one of the serious outcomes of unplanned development, resulting into quantum of hazardous organic and inorganic waste generating daily. Proper waste management is a challenging issue that must be addressed adequately. This is, therefore, carried out with a view of assessing the energy and combustion quality of tannery solid waste with a view of converting them into briquettes for cooking, heating and small home industries and reducing the menace caused by tannery waste disposal. The results of the experiments showed that the combustion rate ranged between 0.171 and 0.217 g/min, the boiling time ranged between 27.78 to 34.11 minutes, the ignition time was found between 14.2 to 17.4 minutes. The durability test and humidity resistance test showed that the briquettes have durability ranged between 92.12 and 95.04 while the humidity resistance was between 95.34 and 97.95. The carbon content ranged between 40.79 and 45.15%. Other results showed that the fixed carbon ranged between 89.93 and 95.46%, volatile matter 1.61 to 4.56% and the calorific values were found between 18.03 and 21.86 MJ/kg. The fleshing has better quality than the other three wastes studied.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"129 1","pages":"122-128"},"PeriodicalIF":0.0,"publicationDate":"2018-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86636533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on Semiconductor Properties of Acetylide-Thiourea Fabricated onto Interdigitated Electrodes (Ides) Platform Towards Application In Gas Sensing Technology","authors":"A. Daud, Wan Mohamed Zin, M. Isa, K. A. Wahid","doi":"10.7454/MST.V21I3.3088","DOIUrl":"https://doi.org/10.7454/MST.V21I3.3088","url":null,"abstract":"In the past few decades, the unique properties of acetylide and thiourea moieties individually have attracted great attention from researchers in various fields to be developed in numerous applications in advanced materials technology, especially as an active layer in gas sensing devices. The molecular systems of acetylide and thiourea provide a wide range of electronic properties as they possess rigid π-systems in their designated structures. In this study, a derivative of acetylide-thiourea featuring N-(4[4-aminophenyl] ethynyl benzonitrile)-N’-(4-ethyl benzoyl) thiourea (TCN) has been synthesised with the general formula of ArC(O)NHC(S)NHC≡C)Ar adopted the system of D-π-A for the significant development of conductive materials. The derivative consists of donating substituent characterised by typical spectroscopic techniques, such as infrared spectroscopy, UV-visible spectroscopy, and H and C Nuclear Magnetic Resonance. In turn, TCN was deposited onto interdigitated electrode (IDE) for the measurement of thin-film resistance. The resistance values of synthesised compound is caused the effect of donating substituent attached to the acetylidethiourea, which indeed altered the conductivity performances of fabricated IDE substrate. In fact, the theoretical calculation also was carried out using Gaussian 09 to evaluate the relationship between experimental and theoretical analyses of acetylide-thiourea semiconductor properties in term of energy band gap and the sensing response to the selected analyte.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"55 3","pages":"103-108"},"PeriodicalIF":0.0,"publicationDate":"2018-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91484684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}