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Assessment of debonding failures in the sandwich plate of stern ramp door of ferry Ro-Ro using k-nearest neighbor algorithm

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AIP Conference Proceedings 2023年第1期2674卷

作者： Safri Adam Tuswan Tuswan Abdi Ismail Achmad Zubaydi Bambang Piscesa Aditya Rio Prabowo Information Technology Study Program Politeknik Aisyiyah Pontianak 78114 Pontianak Indonesia Department of Naval Architecture Institut Teknologi Sepuluh Nopember 60111 Surabaya Indonesia Department 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 Department of Mechanical Engineering Universitas Sebelas Maret Indonesia Surakarta Indonesia

The difficulty in controlling the proper bonding during manufacturing sandwich for ship structure is a major problem. One of the damage types that often occurs is debonding caused by the lack of the adhesive layer bond between the two faceplate materials and the sandwich core at the centre. Furthermore, the identification of damage in ship structure becomes essential to ensure the structural integrity and security issues. Based on the issues above, damage identification on the sandwich plate of Ferry Ro-Ro with several debonding ratios using the k-NN algorithm was proposed. The cross-validation method was used to check the validity of the proposed algorithm model in practice. The proposed models were analyzed with various k-fold values, k-NN values, and number of iterations to investigate the influence of the those parameters on the accuracy of the model. From the result, it can be found that increasing k-fold value is the best strategy to increase the accuracy of the model. However, increase number of neighbors (k) caused a bias so that the accuracy decreased. The tests resulted in the highest accuracy of 97.60% obtained at k-fold 11 with k=3 and 90 iterations. It can be summarized that the large number of k-folds and small k-NN parameters do not require large iterations to obtain high prediction results.

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Causing factors of declining trend on samosir panorusan goat population as endangered species in Samosir Island 2

Causing factors of declining trend on samosir panorusan goat...

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2nd International Conference on Agriculture, Environment and Food Security, AEFS 2018

作者： Ginting, Nurzainah Manik, A. Hasnudi Ginting, N. Aulia, D.N. Marpaung, B.O. Rahman, N.V. Hasanah, U. Animal Production Program Study Faculty of Agriculture Universitas Sumatera Utara Medan Indonesia Architecture Program Study Faculty of Engineering Universitas Sumatera Utara Indonesia Toba Lake and Sustainable Tourism Working Group Universitas Sumatera Utara Medan Indonesia

A declining trend of Samosir Panorusan goat population has been identified. As the Panorusan is an endemic and endangered species goat where the pure breed only 250,000 heads left, a research was conducted in order to find the cause factors for declining trend of population from April to June 2018 in Pangururan District, Samosir Regency. The method used was multiple linier regression analysis with variabel limitations such as goat feed, disease, breeders'experience, local culture and marketing rate of productive ewe. This research was conducted by asking directly to Panorusan goat breeders. The total of 55 goat breeders was divided into 2-3 breeders/villages. The results of this study indicated that the variable of local culture was significantly as a dominant factor that causing a declining trend of Samosir Panorusan goat population. © Published under licence by IOP Publishing Ltd.

关键词： Regression analysis

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Preliminary study on Acoustical Characteristics of Sago Midrib Composite 5

Preliminary study on Acoustical Characteristics of Sago Midr...

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5th International Symposium on Material, Mechatronics and Energy 2018, ISMME 2018

作者： Kusno, Asniawaty Asriani, Sherly Kamil, Kusno Jamala, Nurul Department of Architecture Faculty of Engineering Hasanuddin University Indonesia Study Program of Architecture Engineering Faculty Khairun University Indonesia Mechanical Engineering Department Engineering Faculty Universitas Muslim Indonesia Indonesia

This research is a preliminary study on the use of sago midrib as an acoustic material. This study aims to determine the sago as acoustic material by measuring the absorption coefficient using (impedance tube method) of 100 Hz-1.6 KHz frequencies. The results of measurement were analyzed and compared with common acoustic material available on market as reference. From the measurement of the sago midrib composite, absorption coefficient has fluctuated from low to high frequencies as the absorption coefficient of reference material is found to be more stable. © Published under licence by IOP Publishing Ltd.

关键词： Acoustic impedance

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Analysis of Daylight Distribution on Building Height and Space Depth. 5

Analysis of Daylight Distribution on Building Height and Spa...

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5th International Symposium on Material, Mechatronics and Energy 2018, ISMME 2018

作者： Jamala, Nurul Wika, Annajma Nurul Kusno, Asniawaty Department of Architecture Engineering Faculty Hasanuddin University Indonesia Study Program of Architecture Engineering Faculty Hasanuddin University Indonesia Department of Arch. Engineering Faculty Hasanuddin Univ. Indonesia

Lighting design is one of the priorities in designing buildings. Natural lighting can reduce energy consumption in buildings. Aesthetic levels are the basis of the planning concept, but need to pay attention to the concept of using natural lighting, in order to realize the energy-efficient building design. The purpose of the study was to determine how the level of illuminance affects the opening area, depth of space and height of the building. Quantitative research method is to analysis statistical data from measurements of illuminance levels in space. The results of the study concluded that the level of illuminance in the meeting room of the Center of Technology building in Hasanuddin University exceeded the illuminance standard. The extent of openings in the building envelope affects the illuminance level in space. Natural light distribution affects the height of the building's floor and the depth of space. Based on this conclusion, it is expected that in designing a building it is necessary to pay attention to the building facade, so that the distribution of natural light is not too high into the building and to avoid negative effects such as glare, high brightness and contrast. © Published under licence by IOP Publishing Ltd.

关键词： Energy utilization

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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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Visitor perspectives and satisfaction index towards ecotourism potential in the Leang-Leang Prehistoric Park, Bantimurung Bulusaraung National Park 2

Visitor perspectives and satisfaction index towards ecotouri...

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2nd International Conference on Environment and Forest Conservation (ICEFC)

作者： Asrianny Soekmadi, Rinekso Darusman, Dudung Arifin, Hadi Susilo Bogor Agr Univ IPB Univ Grad Sch Study Program Ecotourism Management & Environm Se Bogor Indonesia IPB Univ Fac Forestry Dept Forest Resources Conservat & Ecotourism Bogor Indonesia IPB Univ Fac Forestry Dept Forest Management Bogor Indonesia IPB Univ Fac Agr Dept Landscape Architecture Bogor Indonesia

The Leang-Leang prehistoric park is one of four leading destinations in Bantimurung Bulusarung National Park, however, the evaluation of visitor perspectives and satisfaction index in this site were still limited. This study aimed to analyze the importance-performance analysis based on visitor perspectives and to assess visitor satisfaction index in the Leang-Leang destination. Fifty people selected through convenience sampling method were involved as respondents. Consumer perspective assessment was focused on 33 ecotourism potential subcomponents and the scoring method referred to Likert scale, prior to group into the IPA matrix/Cartesian diagram. The visitor satisfaction assessment was calculated based on the formula of customer satisfaction index. The result showed that there were 7 ecotourism potential subcomponents that need to be prioritized by managerial team, i.e local cultural arts, guide and interpreter, public lavatory, garbage dump, rest area, security facility (tourist police) and shopping facility. Flora attraction, panorama, specific attraction, historical heritage, hospitality of local people, the easiness access to locations, the easiness access to get information about the distance from the nearest city, brochures, maps or other directions, clean water availability, service, care and skill of human resource had been already in the good condition, so keep up the good work. Fauna attraction, local traditions and customs, festival, carvings and crafts, local food, homestay, hotel, camping ground, the easiness access to get transportation, telephone, faximile or internet and health facility were included in low priority subcomponents. Moreover, cultural landscape, local people daily life and transportation costs were categorized as possible overkill subcomponent. The score of visitor satisfaction index was 55.57 and categorized as a moderate satisfaction level.

关键词： Parks

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The Development of Historical and Eco-Tourism District of Setu Babakan in South Jakarta, Indonesia: Ecodistrict Planning Approach 3

The Development of Historical and Eco-Tourism District of Se...

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3rd HABITechno International Conference

作者： Samsirina Pratiwi, Wiwik Dwi Putri, Reiska M. Architecture Study Program ITB Indonesia

On the development of tourism within a settlement, its sustainability depends on how to make the lowest possible environment impact and provide long-term economic and social benefits to local communities. This paper describes the results of analysis on a settlement where the tourism activities developed in it. The principal of eco-district was the main theory used in the analysis in order to accelerate district-scale sustainability. Eco-district is the principle of urban planning that aims to integrate the objectives of sustainable development and reduce the ecological impact of the development. The case study was located in Setu Babakan, a lakeside and a historical tourism district in South Jakarta, Indonesia. The focus of the study was on the physical condition of the open spaces and activities inside them. In some tourism destination areas, many of the attractions took place in open spaces. The results of the evaluation were several recommendations for the development concept of open spaces in the historical and ecotourism district of Setu Babakan which hopefully will guarantee it's sustainability in the future. © Published under licence by IOP Publishing Ltd.

关键词： Sustainable development

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Toward green and sustaianable ship recycling industry in Indonesia 6

Toward green and sustaianable ship recycling industry in Ind...

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6th International Conference on Ship and Offshore Technology - Indonesia: Developments Marine Design, Construction and Operation, ICSOT Indonesia 2019

作者： Sunaryo Djatmiko, E.B. Kurt, R.E. Naval Architecture and Marine Engineering Study Program Universitas Indonesia Indonesia Department of Marine Engineering Institut Teknologi Sepuluh Nopember Indonesia Department of Naval Architecture Ocean and Marine Engineering University of Strathclyde United Kingdom

ISBN: (纸本)9781713830368

The main aim of this project is to develop a sustainable, safe & environmentally sound ship recycling industry in Indonesia. As the world's largest archipelago state, it is essential for Indonesia to maintain a large fleet of ships to ensure sufficient sea transportation. However, after completing their operational life, all these ships are required to be dismantled. Currently, there is no proper understanding & infrastructure for 'Ship Recycling' in Indonesia yet. This lack of understanding causes serious contamination of the sea which results in harming the environment. Furthermore, the working conditions are extremely poor because the yards are not fit for purpose and workers are exposed to many hazards. Referring to International Maritime Organization’s Hong Kong Convention a project is carried out to preparing the process of establishing green and sustainable ship recycling industry in Indonesia by conducting gap analyses and proposing environmentally friendly ship recycling yard concept. © 2019: The Royal Institution of Naval Architects.

关键词： Ships

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Transmission of dengue hemorrhagic fever and climate variability in Jakarta 1

Transmission of dengue hemorrhagic fever and climate variabi...

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1st International Conference on Environmental Sciences, ICES 2018

作者： Kusnoputranto, Haryoto Maria Sintorini, Margareta Warno Utomo, Suyud Aliyyah, Nurusysyarifah Ria Kristina Sinaga, Epi Assetya Pratiwi, Okky Department of Environmental Health Faculty of Public Health Universitas Indonesia Indonesia Environmental Engineering Faculty of Landscape Architecture and Environmental Technology Trisakti University Indonesia Public Health Study Program Institute of Health Indonesia Indonesia Environmental Health Study Program Institute of Health Indonesia Indonesia

Dengue hemorrhagic fever (DHF) has become an endemic in major cities in Indonesia. The climate change and poor level of awareness and knowledge of the community in Indonesia have caused an increase in the DHF cases. Outbreaks on January until April 2015, the morbidity rate reached 50.75. In 1996, the Intergovernmental Panel on Climate Change (IPCC) predicted threefold increase in the dengue hemorrhagic fever incidents in Indonesia by 2070, if the environment and community conditions do not improve. This study aims to provide a dynamic model to predict the dynamics of the DHF incidents based on climate variability in the Special Capital Region of Jakarta. The design of this study was ecologic study with hypothesis test, modelling, simulation, and intervention. In collecting the data, interview with respondents and measurement of climate variables were conducted. Interviews with respondents include the level of knowledge, attitudes, and behaviour (PSP) of the community. Measurements of climate factors include rainfall, temperature, humidity and CO2 level in the ambient environment. The DHF system dynamics model simulation shows that the significant effect on the decline of Breeding Places and the decrease of DHF cases were achieved by increasing the participation of the community to actively control water places that are potential for mosquito breeding places. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Climate change

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The obstacles of green building implementation in Semarang city

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

作者： D N A Nugradi Study Program of Architecture Department of Civil Engineering Faculty of Engineering Universitas Negeri Semarang Indonesia

The Semarang City Government has issued a Mayor Regulation on Green Buildings since 2019. Since then the construction of buildings with a certain floor area in Semarang City must follow this regulation. Evaluating implementation constraints related to green building construction based on the experience of the development actors, is an important thing to do. This study aims to identify obstacles in realizing green buildings in the city of Semarang. Data collection was carried out through a questionnaire survey of respondents from development actors involved in green buildings such as contractors, consultants and project owners and bureaucratic officials related to green building licensing. Data analysis was performed using descriptive analysis to reach agreement between respondents. Next, a hierarchy of these constraints will be sought. Constraints found in realizing green buildings are: lack of socialization from the city government, alternative materials, lack of best practices, experts, and financing. For this reason, a strategy is needed to overcome these obstacles from every aspect or based on a combined consideration of all aspects.

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