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INDONESIA
International Journal of Engineering Science and Technology Development (IJEST)
Published by Universitas Bandar Lampung
ISSN : 23373180     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Engineering
International Journal of Engineering Science and Technology Development (IJEST), published every four month, is a carefully refereed international publication. Contributions of high technical merit are to span the breadth of science and engineering disciplines; covering the main areas of science and engineering : Engineering, Computer Science, Architecture, Mathematics and Statistics Applications, Chemistry, Physics, Biology, Geology. International Journal of Engineering Science and Technology Development (IJEST) published contributions under regular papers, invited review papers, short communications, technical notes, and letters to the editor. Book reviews, reports of and/or call for papers of conferences, symposia and meetings, and advances in research equipment could also be published in this journal with minimum charges.
Arjuna Subject : -
Articles 16 Documents
 1   2 
The Modified CW1 Algorithm For The Degree Restricted Minimum Spanning Tree Problem . Wamiliana; Louis Caccetta
International Journal of Engineering Science and Technology Development (IJEST) Vol 1, No 2 (2013): August
Publisher : University of Bandar Lampung (UBL)

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Abstract

Given edge weighted graph G (all weights are non-negative), The Degree Constrained Minimum Spanning Tree Problem is concerned with finding the minimum weight spanning tree T satisfying specified degree restrictions on the vertices. This problem arises naturally in communication networks where the degree of a vertex represents the number of line interfaces available at a terminal (center). The applications of the Degree Constrained Minimum Spanning Tree problems that may arise in real-life include: the design of telecommunication, transportation, and energy networks. It is also used as a subproblem in the design of networks for computer communication, transportation, sewage and plumbing. Since, apart from some trivial cases, the problem is computationally difficult (NP-complete), a number of heuristics have been proposed. In this paper we will discuss the modification of CW1 Algorithm that already proposed by Wamiliana and Caccetta (2003). The results on540 random table problems will be discussed.
Recent Advances in Biofuel Cell and Emerging Hybrid System Abdul Aziz Ahmad; Raihan Othman
International Journal of Engineering Science and Technology Development (IJEST) Vol 1, No 3 (2013): December
Publisher : University of Bandar Lampung (UBL)

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Abstract

The present paper reviews the recent development of biofuel cell. Due to its renewable nature and milder operating conditions compared to conventional fuel cell, the electrochemical system has been extensively studied. However, major problems associated with this type of electrochemical system remain an intimidating challenge, the utmost being the low power output and stability of biocatalyst being used. Various attempts have been made to overcome these problems, some are reviewed here. The authors suggest a new direction in solving these problems by using hybrid system i.e. metal biofuel cell. The new hybrid system developed is of lower cost, less complex, higher OCV and greater power output.
Damping Factor Of Precast Concrete With Wet Connection Hery Riyanto
International Journal of Engineering Science and Technology Development (IJEST) Vol 1, No 1 (2013): April
Publisher : University of Bandar Lampung (UBL)

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Abstract

This research aims at determining the behaviour of structural elements of precast reinforced concrete beams which are connected with wet and dry connections. Specimen used was 30 Mpa reinforced concrete beams with 6 pieces of 8 mm diameter main reinforcement which are placed on two rollers at the joint pedestal of each end and has a rectangular cross section of prismatic 10x18 cm2. Wet connection is a connection that uses a polymer concrete material of 40 MPa with a grafting method using prepacked method. The result of the research is expected to contribute to the development of precast concrete in building construction in Indonesia. In the elastic condition, the beam monolith has the largest natural frequency of the value, but a wet connection beam has a low natural frequency value. The difference of this natural frequency value is also equal to the condition of crack and ultimate.
Microstructure Alterations of Ti-6Al-4V ELI during Turning by Using Tungsten Carbide Inserts under Dry Cutting Condition Ibrahim G.A.; Arinal H.; . Zulhanif; Haron C.H.C.
International Journal of Engineering Science and Technology Development (IJEST) Vol 1, No 2 (2013): August
Publisher : University of Bandar Lampung (UBL)

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Abstract

Titanium alloys possesses a hexagonal close packed(h.c.p) structure, called phase to ambient temperature. Thisstructure changes to body center cubic (b.c.c), called phase tothe temperature of 882 C. Machining process that generates hightemperature during machining can affect on microstructures ofmachined surface, which represents as a quality of components.The turning parameters evaluated are cutting speed (55 - 95m/min), feed rate (0.15 - 0.35 mm/rev), depth of cut (0.10 - 0.20mm) and tool grade (uncoated, CVD and PVD). The aims of thispaper are to investigate the effects of machining process onmicrostructures of machined surface and chip were machinedusing tungsten carbide inserts under dry cutting condition. Theresults show that machining at high cutting speed (95 m/min)affected on the microstructure significantly at the end ofmachining. The temperature is the most significant factoraffected on microstructure of the machined surface and chip atshear zone. The changes of microstructure were also affected bythe tool pressure during cutting.
Zinc-Air Battery – Powering Electric Vehicles to Smart Active Labels Raihan Othman; Hens Saputra
International Journal of Engineering Science and Technology Development (IJEST) Vol 1, No 1 (2013): April
Publisher : University of Bandar Lampung (UBL)

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Abstract

The present paper reviews the development of zinc-air battery. Due to its high energy density advantage, the electrochemical system has been extensively studied and developed. However, major problems associated with the electrochemical system remain a formidable challenge, the utmost being to develop an electrically rechargeable zinc-air battery. Efforts made to overcome or mitigate the limitations concerned can be conceptually classified either as solving problems or seeking solutions. The changing paradigm from the electrically rechargeable system to the mechanically rechargeable system is illustrated as an example. Emerging innovations in smart active labels - flat, flexible and functional devices, particularly in healthcare industry, instigated the authors to develop zinc-air battery as a prospective micro-power source for smart active labels. The thin battery technology developed, in collaboration between IIUM and BPPT, is of low cost, comprises of green electro active materials, and able to operate in quasi-neutral electrolyte. These features fulfil the criteria for the battery to be incorporated into disposable smart active labels.
Infrastructure Health Monitoring System (SHM) Development, a Necessity for Maintenance and Investigation Priyo Suprobo; . Faimun; Arie Febry
International Journal of Engineering Science and Technology Development (IJEST) Vol 1, No 3 (2013): December
Publisher : University of Bandar Lampung (UBL)

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Abstract

Failure of Kutai Bridge already gives Indonesia civil engineer a blow in face. The failure which bring cause human accident make a new challenge to Indonesia civil engineer not to wait till failure but to safe before the construction failure. By the development in sensor and monitoring technology the idea become more realistic. Structure Healthy Monitoring (SHM) become new idea to detect, to monitor and to find out the reliability of structure. The development and research in Indonesia for SHM till now are presented and compared to other country. SHM research is needed to predict behavior of bridge by using data from monitoring to gain healthy condition. 

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