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Online social network services provide a platform for human social interactions. Nowadays, many kinds of online interactions generate large-scale social network data. Network analysis helps to mine knowledge and pattern from the relationship between actors inside the network. This approach is important to support predictions and the decision-making process in many real-world applications. The social network analysis methodology, which borrows approaches from graph theory provides several metrics that enabled us to measure specific properties of the networks. Some of the metrics calculations were built with no scalability in minds, thus it is computationally expensive. In this paper, we propose a graph sampling approach to reduce social network size, thus reducing computation operations. The performance comparison between natural graph sampling strategies using edge random sampling, node random sampling, and random walks are presented on each selected graph property. We found that the performance of graph sampling strategies depends on graph properties measured., Comment: 7 pages, 2 figures

There are three approaches in the current social network analysis study: Graph Representation, Content Mining, and Semantic Analysis. Graph Representation has been used for analyzing social network topology, structural modeling, tie-strength, community detection, group cohesion visualization, and metrics computations. This paper provides a taxonomy of social network analysis based on its graph representation., Comment: 11 pages, 2 tables, 2 figures

In line with the increase of coffee enthusiasts in Indonesia, coffee shops are now emerging roommates presents the enjoyment of local coffee in a distinctive way. One of the coffee shops that have a typical way is a Klinik Kopi. The purpose of this study: 1) to identify the Klinik Kopi business model, 2) to analyze internal and external factors that affect the Clinical Coffee business activities and, 3) to formulate strategies and improvement programs as the business development of the Klinik Kopi. This study uses a combination of business model canvas (BMC) approach and SWOT matrix analysis. Results of the study show that optimizing the main resources to create a new value proposition in designing future business models in the form of socio-entrepreneurship programs and business inspiration books influences every element of the business model canvas, namely an increase of carried out in key activities, key partners, channels, segments consumers and incoming revenue streams. Consumer relationships need to be improved in an effort to maintain customer segments.

In line with the increase of coffee enthusiasts in Indonesia, coffee shops are now emerging roommates presents the enjoyment of local coffee in a distinctive way. One of the coffee shops that have a typical way is a Klinik Kopi. The purpose of this study: 1) to identify the Klinik Kopi business model, 2) to analyze internal and external factors that affect the Clinical Coffee business activities and, 3) to formulate strategies and improvement programs as the business development of the Klinik Kopi. This study uses a combination of business model canvas (BMC) approach and SWOT matrix analysis. Results of the study show that optimizing the main resources to create a new value proposition in designing future business models in the form of socio-entrepreneurship programs and business inspiration books influences every element of the business model canvas, namely an increase of carried out in key activities, key partners, channels, segments consumers and incoming revenue streams. Consumer relationships need to be improved in an effort to maintain customer segments.

Auditor performance is the result of work achieved by the auditor in carrying out his duties, which in accordance with the responsibilities given to him and become one of the benchmarks that can be measured through certain measurements of quality related to the quality of work produced. This study aims to examine the effect of the role ambiguity and time budget pressure on auditor performance. The research population is 50 public accounting firms in South Jakarta Indonesia and the sample is taken from 20% of the total KAP population in the South Jakarta area of Indonesia as much as 50 KAP registered in IAPI 2017 with a range of 2-5 auditors. The results show that role ambiguity and time budget pressure simultaneously have a significant influence on auditor performance. Role ambiguity partially has a significant and positive influence on auditor performance. Time budget pressure partially has a significant and positive influence on the performance of auditors. The test result shows that time budget pressure variable directly influence to auditor performance. This result proves that the higher time owned by the auditor in performing the audit assignment will be the better performance performed by the auditor and vice versa with the low time for the auditor to conduct the examination will further reduce the accuracy of the auditor. Keywords: Role Ambiguity, Time Budget Pressure, Auditor Performance.

Auditor performance is the result of work achieved by the auditor in carrying out his duties, which in accordance with the responsibilities given to him and become one of the benchmarks that can be measured through certain measurements of quality related to the quality of work produced. This study aims to examine the effect of the role ambiguity and time budget pressure on auditor performance. The research population is 50 public accounting firms in South Jakarta Indonesia and the sample is taken from 20% of the total KAP population in the South Jakarta area of Indonesia as much as 50 KAP registered in IAPI 2017 with a range of 2-5 auditors. The results show that role ambiguity and time budget pressure simultaneously have a significant influence on auditor performance. Role ambiguity partially has a significant and positive influence on auditor performance. Time budget pressure partially has a significant and positive influence on the performance of auditors. The test result shows that time budget pressure variable directly influence to auditor performance. This result proves that the higher time owned by the auditor in performing the audit assignment will be the better performance performed by the auditor and vice versa with the low time for the auditor to conduct the examination will further reduce the accuracy of the auditor. Keywords: Role Ambiguity, Time Budget Pressure, Auditor Performance.