MODEL OF HETEROGENEOUS LOCAL COMMUNICATION NETWORK WITH SYNCHRONOUS TIME ACCESS PROTOCOL, CONSIDERING THE RELIABILITY OF ITS ELEMENTS

In the article the local communication network, heterogeneous on the intensity of the incoming message flow and the type of messages, with synchronous time access protocol is considered. All communication stations of the considered local network consist of three substations: speech substations, video information substations and data substations. Speech substations form the speech subnet, video information substations form the video information subnet, and data substations form the data subnet. Substations within the same subnet are homogeneous in their activity. A model of the considered local network in discrete time is being carried out, which allows assessing the effect of the failure processes and restoration of substations of network stations and the communication channel on its characteristics. Based on the developed model of the local network, the probability-time characteristics of the considered network are selected and determined.

Ricko Aulia 1411050104, SEQUENCE FLOW DAN MESSAGE FLOW PADA BPMN

Pemodelan proses bisnis merupakan cara untuk memahami, mendesain dan menganalisa suatu proses bisnis. Manfaat pemodelan proses bisnis adalah untuk membantu perusahaan memahami proses bisnisnya dengan baik, mengidentifikasi permasalahan seperti critical path atau bottleneck yang mungkin terjadi, mengembangkan, mendokumentasikan serta mengkomunikasikannya pada semua pemangku kepentingan bisnis. Sehingga perusahaan dapat meningkatkan performance dari pengelolaan proses bisnisnya. Pemodelan proses bisnis dapat dilakukan dengan beberapa cara atau standar, antara lain dengan BPMN (Business Process Modelling Notation) dan Activity Diagram UML (Unified Modelling Language). Kedua standar pemodelan tersebut yang akan dibandingkan dengan studi kasus pemodelan proses bisnis perwalian secara online atau dikenal dengan nama FRS Online (Formulir Rencana Studi). Secara umum BPMN cenderung menggambarkan proses dari pandangan seorang analisis bisnis. BPMN tidak dibuat dengan tujuan untuk dibuat programnya. BPMN perlu disempurnakan (misalnya ke proses BPEL) sebelum bisa dibuat pedoman pemrograman. Alasan inilah, BPMN digunakan oleh analisis bisnis dengan tujuan bukan untuk implementasi tapi lebih ke arah penyajian kebutuhan yang akan diberikan kepada analisis IT dan software development. Umumnya, BPMN dipakai untuk menghasilkan “BPEL code” yang akan diperbaiki oleh developer sehingga dapat dibuat implementasinya.

Notifications workflows using the CERN IT central messaging infrastructure

In the CERN IT agile infrastructure (AI), Puppet, the CERN IT central messaging infrastructure (MI) and the Roger application are the key constituents handling the configuration of the machines of the computer centre. The machine configuration at any given moment depends on its declared state in Roger and Puppet ensures the actual implementation of the desired configuration by running the Puppet agent on the machine at regular intervals, typically every 90 minutes. Sometimes it is preferable that the configuration change is propagated immediately to the targeted machine, ahead of the next scheduled Puppet agent run on this machine. The particular need of handling notifications in a highly scalable manner for a large scale infrastructure has been satisfied with the implementation of the CERNMegabus architecture, based on the ActiveMQ messaging system. The design and implementation of the CERN-Megabus architecture are introduced, followed by the implementation of the Roger notification workflow. The choice of ActiveMQ is analysed and the message flow between the Roger notification producer and the CASTOR, EOS, BATCH and Load Balancing consumers are presented. The employment of predefined consumer modules in order to speed up the on-boarding of new CERN-Megabus use cases is also described.