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1st International Symposium on Transportation Studies for Developing Countries, ISTSDC 2017

作者： Wibowo, Sony Sulaksono Wicaksana, Rian Bandung Instute of Technology Study Program of Civil Engineering Bandung Indonesia

Pedestrians who cross without any crossing facilities and under mixed-traffic tend to have varying responses. The responses can be analyzed by using multiple linear regression model, with pedestrian crossing delay and pedestrian crossing speed set as response variables. This research aims to develop two pedestrian crossing models based on the condition at the midblock part of urban street, in particular commercial area and without specific crossing facilities. The two models are pedestrian crossing delay model and pedestrian crossing speed model. The affecting factors are considered in linear relationship and the multiple-linear regression models are used. The principal factor in the pedestrian crossing delay model is group size of more than 3 persons, while in the model of pedestrian crossing speed, the principal factors are number of group size and pedestrian baggage. The mean of pedestrian crossing delay was about 3 seconds while pedestrian crossing speed was about 1 m/s. © 2018 The Authors, published by EDP Sciences.

关键词： Linear regression

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The Water Quality Characteristics and Quality Status of Bengkulu River and Nelas River, Bengkulu Province: Conditions for The Last Six Years

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IOP Conference Series: Earth and Environmental Science 2022年第1期950卷

作者： I Khalik A Sapei S Hariyadi E Anggraeni Natural Resources and Environmental Management Study Program Graduate School of IPB University Bogor Indonesia Public Health Study Program STIKES Tri Mandiri Sakti Bengkulu Indonesia Department of Civil and Environmental Engineering IPB University Bogor Indonesia Department of Aquatic Resources Management IPB University Bogor Indonesia Department of Agroindustrial Technology IPB University Bogor Indonesia

The existence of extractive activities around the river has a negative impact on the quality of river water. This study aims to provide an overview of water quality characteristics and water quality status of Bengkulu River and Nelas River in Bengkulu Province. The data used is river quality monitoring conducted by the Environment and Forestry Service of Bengkulu Province from 2014 to 2019. Measurements are carried out twice a year representing, the dry season (March to June) and the rainy season (September to December). The observation stations representing upstream, middle and downstream of rivers conditions. The parameters observed were physical, chemical, and biological parameters. The water quality status is determined using the Storet Index. The results show that both rivers have Storet Index >-31. It means that these river water are heavily polluted. Parameters that have exceeded the water quality standard are TSS, DO, BOD, COD, Fe, Mn, Cu, and total coliform. The river water quality parameters, especially heavy metals, may be caused by open land being washed and carried into the river body. The existence of population and animal activities as well as industrial waste outlets at upstream also affect the decline of river water quality.

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A critical review on structural testing and assessment of lightweight sandwich structure for ship structure application

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AIP Conference Proceedings 2023年第1期2674卷

作者： Tuswan Tuswan Abdi Ismail Achmad Zubaydi Bambang Piscesa Nadya Paramita Langening Sukma Sukma Department of Naval Architecture Institut Teknologi Sepuluh Nopember Indonesia Departement of Naval Architecture Universitas Diponegoro Semarang Indonesia Ship Machinery Study Program Faculty of Vocational Studies Indonesia Defense University Belu Indonesia Department of Civil Engineering Institut Teknologi Sepuluh Nopember 60111 Surabaya Indonesia

Many experts have lately joined the effort to study lightweight materials as an alternative solution in ship construction. However, there are limited references regarding the discussion of the current development of the lightweight material application, specifically in ship structure. The purpose of this article is to offer an overview of the present state of the art and give critical points concerning the design and requirements of sandwich applications in ship constructions. The discussion covers several topics, including the current rules/ standard of developing material issued by classification bodies, various sandwich types with different application areas, and an overview of the structural strength assessment of hybrid sandwich application on various ship structure locations. Some potential scenarios for sandwich constructions in maritime applications are also proposed.

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The influence of motorcycle behavior on saturation flow rate at signalized intersections with and without exclusive stopping space for motorcycle (ESSM)

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IOP Conference Series: Earth and Environmental Science 2021年第1期673卷

作者： I M Kariyana P A Suthanaya D M P Wedagama I M A Ariawan D Dissanayake Doctor of Engineering Study Program Udayana University Bali Department of Civil Engineering Faculty of Engineering Udayana University Bali School of Engineering Newcastle University Newcastle upon Tyne UK

Traffic in most developing nations is considered mixed or heterogeneous. Motorcycle and other vehicle's behavior at signalized intersections would not probably have a similar influence on intersection capacity and time of the traffic signals. In theory, the saturation flow rate is a basic parameter to estimate the intersection capacity and time of the traffic signals. This study, therefore, aims to analyze the influence of motorcycle behavior on the saturation flow rate at signalized intersections in Denpasar, Bali. Traffic flow data are observed at four signalized intersection approaches that have similar width and traffic characteristics. Two approaches have exclusive stopping space for motorcycles (ESSM) while the other two do not. The study results show that more than 50% of motorcycles tend to be distributed beside flow at signalized intersections with ESSM on either light or dense traffic flows. In contrast, at the signalized intersections without ESSM, motorcycles are found to be distributed inside flow during low traffic conditions, while distributed beside flow during dense traffic flow. Besides, the saturation flow rates of motorcycle inside flow are less than that of beside flow at signalized intersections both with and without ESSM. A new method to estimate saturation flow is proposed.

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Analysis of productivity and the need for heavy equipment on grade B aggregate foundation layers work (case study: Pekan Gedang road section, Batang Asai – Muaro Talang District, Sarolangun)

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IOP Conference Series: Materials Science and engineering 2020年第1期807卷

作者： Annisaa Dwiretnani Henriadi Lecturer at the Study Program of Civil Engineering University Batanghari Jambi Indonesia Student at the Study Program of Civil Engineering University Batanghari Jambi Indonesia

Grade B aggregate foundation layers are part of the road foundation that is located between subgrade and grade A foundation layers. The function of grade B aggregate foundation layers is to minimize the spread of loads to the subgrade. Road infrastructure is one of the factors that support an area development. Road improvements aimed to improve the social economy and open access to isolated areas of considerable potential for the development of natural resources. This research analyses productivity and the need for 5 types of heavy equipment on grade B aggregate foundation layers work (case study: Pekan Gedang road section, Batang Asai – Muaro Talang District, Sarolangun). Noted that heavy equipment specifications were used in project site same as the planned. The results showed that based on time schedule and project volume in this research can be completed properly and on time if using 5 units of dump trucks and 1 unit each for wheel loader, vibratory roller, motor grader and water tank truck, with productivity for wheel loader is 125.42 m3, dump truck is 2.69 m3, vibratory roller is 87.15 m3, motor grader is 57.24 m3 and water tank truck is 71.14 m3.

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Developing and evaluating prediction models of architectural work performance by combining earned value methods and support vector machine

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AIP Conference Proceedings 2021年第1期2447卷

作者： Maulyda Nurannisa Apif Miptahul Hajji Aisyah Larasati Yuh Wen Chen 1Industrial Engineering Study Program State University of Malang Malang Indonesia 2Civil Engineering Study Program State University of Malang Malang Indonesia 3Department of Information Management Da-Yeh University Chang Hwa Taiwan

The concept of project management helps minimize the risk of loss for project managers. This study aims to develop a model for evaluating the performance of architectural work by combining the Earned Value Management (EVM) and Support Vector Machine (SVM) models. The Earned Value method has advantages in forecasting project scheduling and planning. In this research, forecasting is done with the help of machine learning to increase the accuracy of project completion time prediction. This research uses the architectural data study object of the Lecture Building Project (GKB UM). This study indicates that the performance of the architectural work of GKB UM has been delayed with a schedule variance (SVt) value of -13.53 weeks. In developing the prediction model using the Support Vector Machine algorithm, the most optimal parameter results are using the Radial Basis Function (RBF) kernel type, complexity (C) 150, and gamma (y) 0.01 with a Root Mean Square Error (RMSE) value of 0.565. Thus the prediction of project completion has a difference of 4 weeks. Project delays were caused by weather problems, Tower Crane (TC) damage, incompatibility of Homogeneous Tile (HT) work, and changes in Bill of Quantity (BOQ).

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Interior design study of lecturer rooms at E12 building 2nd floor UNNES – learn from COVID-19 pandemic

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IOP Conference Series: Earth and Environmental Science 2021年第1期700卷

作者： A Purnomo Study Program of Architecture Department of Civil Engineering Faculty of Engineering Universitas Negeri Semarang Building E4 Kampus Sekaran Gunungpati Semarang 50229 Indonesia

The covid-19 pandemic case has changed the structure of life in all aspects throughout the world. The field of man-made environment or architecture is no exception. The interior arrangement of a building, as part of the man-made environment, is also affected. The interior design of a building today seems to be obliged to participate in following the standards of new health-protocols in the new normal *** about the interior of the building that has already been utilized? Of course it requires further study to find out whether the interior of a building can be said to be healthy or not. This study aims to examine the interior design of the lecturer room E12 building 2nd floor UNNES in terms of health that is emphasized from the behavior of its users by referring to the situation of the covid-19 pandemic and its future prospects. The research method used is by field observations to search visual data, observing user behavior and textual data. Those who are categorized as users of the lecturer room E12 building 2nd floor UNNES are lecturers from the Department of Architecture, students, administrators and guests. The results of this study indicate that based on the pattern of user behavior and associated with the standard requirements of space, area, volume of space, material and infrastructure conditions, interior design of lecturer room E12 building 2nd floor UNNES, is included in healthy category, although there are several minor corrections that can be included as suggestions for improvement in order to adjust to the new normal era during the covid-19 pandemic period and thereafter.

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Delineation of flash flood hazard zones based on morphometric parameters using GIS technique in upper Lematang sub-watershed

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IOP Conference Series: Earth and Environmental Science 2021年第1期708卷

作者： A Dinata F Dhiniati L E Diansari Civil Engineering Study Program College of Technology Pagaralam 75 Masik Siagim Street – 31521 Pagar Alam City South Sumatera Indonesia

The hilly and mountainous topography with high annual rainfall triggered a flash flood in the upper Lematang sub-watershed. The impact caused not only damaged infrastructure, agriculture land, and even fatalities. This research aimed to conduct flash flood hazard zoning based on morphometric parameters using the GIS technique. By extracting the DEM data, it is generated to a slope map, flow direction, flow accumulation, stream order, and watershed boundary. The data were then evaluated to obtain the morphometric parameters. Parameters analyzed using the PCA approach to get the correlation between parameters related to flash flood hazards. Of the 12 parameters, the KMO value is 0.66, and a significant level is 0.001 <0.05 with a sufficient level of intercorrelation. The result of PCA analysis, two factors were obtained with an eigenvalue > 1, and the cumulative percentage of the two factors was able to explain data variations of 87.49%. Finally, using 12 parameters, the upper Lematang sub-watershed area had 48.79% very-high hazard zones of a flash flood, 16.48% high zones, 20.28% moderate zones, and 0.97% low zones, and 13.48% very-low zones. The results of this study can be used in mitigation activities as well as for integrated watershed management.

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The impact of land-use change on Cengklik Reservoir's sedimentation rate

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Journal of Physics: Conference Series 2021年第1期1858卷

作者： Purwanti Sri Pudyastuti Annisa Fathi Yakan Jaji Abdurrosyid Hermono S Budinetro Civil Engineering Study Program Faculty of Engineering Universitas Muhammadiyah Surakarta Jl. A. Yani Tromol Pos I Pabelan Kartasura Surakarta Indonesia 57102

The Cengklik Reservoir is operated for irrigation of rice fields in 3 sub-districts in Boyolali Regency, namely Sambi, Ngemplak, and Nogosari. At the present time, the volume of the Cengklik Reservoir has decreased and resulted in dryness during the dry season. One of the main causes is due to the high sedimentation rate. This research was conducted to evaluate changes in land use that resulted in sedimentation in the Cengklik Reservoir. Erosion prediction in this study uses USLE (Universal Soil Loss Equation) analysis. The amount of sediment obtained uses the standard erosion data from USLE calculations, namely by multiplying the amount of erosion by the SDR and the area of River Basin. The potential for erosion and sedimentation used land use data for 10 years, from 2009 to 2019. Based on the research, the amount of erosion and sedimentation in the Cengklik Reservoir was fluctuated with the highest amount occurring in 2016, with erosion of 9,292 tones/ha/year and sedimentation of 4304,154 tons/year. In general, erosion and sedimentation have increased from 2009 to 2019. The classification of erosion in the Cengklik Reservoir according to this study was categorized as light erosion. The trap efficiency used in this study was calculated using formulae based on the research of Heinemann (1981) using the Brune method for small reservoirs with an area of less than 0.5 km2. In general, based on this study, the Trap Efficiency in Cengklik Reservoir was 95.254%.

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Impact of infrastructure development jalur jalan lintas selatan (jjls) in Yogyakarta to change in land price

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IOP Conference Series: Earth and Environmental Science 2021年第1期683卷

作者： H Edy M Baiquni B Triatmodjo Doctoral Student in Environmental Sciences Doctoral Study Program Postgraduate School of Universitas Gadjah Mada Lecturer in Doctoral Program in Environmental Sciences Postgraduate School of Universitas Gadjah Mada and Lecturer in Regional Development Study Program at the Faculty of Geography Universitas Gadjah Mada Lecturer in Doctoral Program in Environmental Sciences Postgraduate School of Universitas Gadjah Mada and Lecturer in Civil Engineering Study Program Faculty of Engineering Universitas Gadjah Mada

The Southern Trans-Java Route (Jalur Jalan Lintas Selatan – JJLS) infrastructure development is a national program that goes through five provinces in the island of Java, namely the provinces of East Java, Central Java, Yogyakarta Special Region, West Java, and Banten. In Yogyakarta, the Southern Trans-Java Route (JJLS) cuts across three regencies, which are Gunungkidul Regency, Bantul Regency, and Kulonprogo Regency. This research selected locations in Jetis Village, Saptosari District, Gunungkidul Regency, Gadingsari Village, Sanden District, Bantul Regency, and Sindutan Village, Temon District, Kulonprogro Regency for its study. The aims of this research are to analyze price changes that occur. The research method employed in this study is the qualitative descriptive analysis method. The villages set as study locations were determined by purposive method and data collection was conducted through in-depth interviews with informants who understand the issues relevant to the research objectives. Based on the acquired study results, the highest change in land price took place in Sindutan Village. A significant increase in land price occurred.

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