Information System for Selection of Production Line for Plastic Item Injection Machine Number A36 Using Priority Scheduling Method

A PT. Astra Components Indonesia manufactures injection plastic goods to be sent to customers, in the production process the machines used are capable of producing several types of injection plastic goods, so that products can be provided regularly and there is a process of changing products or better known as the Dandory process. Found an obstacle that is an error in determining the order of dandory for production. Consequently, the condition of goods in the warehouse is irregular. It is detrimental to the company with the time, material and labour that has been expended for production so that an Information System is needed to determine the priority schedule for the replacement of injection plastic goods in this study taking the case at machine number A36. The system development uses the Waterfall method; the system description will be described by the Unified Modeling Language Modeling (UML) method. Data collection is done by observing directly observing production activities in the company as well as interviews with relevant parties, and for solving problems, the system will be assisted by Priority Scheduling method. The results of the research get an information system that will provide recommendations for items that will first be produced appropriately.

PERBANDINGAN RESILIENCE CONCEPT DAN RULE-BASED TERHADAP PENANGANAN JADWAL OPERASI BEDAH UNTUK EMERGENCY CASE DAN ELECTIVE SURGERY

Surgical schedule changes, caused by uncertainty case on the day of operation, can decrease the hospital’s service quality. Resilience Concept algorithm produces the risk value for schedule modification caused by the uncertainty case. However, this algorithm only managed the delay of elective surgery in previous research. Therefore, this study applies the resilience concept algorithm in handling the emergency case, and the shift of elective surgery into earlier than its current schedule. Resilience algorithm’s performance is compared to Rule-Based algorithm in managing the surgery’s schedule for uncertainty case. There are 20 test scenarios, consisting of 12 scenarios for elective surgery schedule changes and 8 scenarios for emergency case, that were given trial to the algorithms. Both of the algorithms 100% succeeded passing through all the scenarios. Yet, both of the algorithms could not give the priority schedule changes based on the risk level. Resilience algorithm could not give the priority based on the risk level of value caused by the imperfection of the resources delay calculation (Tn).Keywords: Surgical schedule, Resilience Concept, Rule-Based, Uncertainty Case, Emergency CaseAbstrakPerubahan jadwal operasi akibat kejadian tidak terduga (uncertainty case) di hari-H operasi dapat menurunkan kualitas layanan rumah sakit. Algoritma Resilience Concept menghasilkan nilai resiko untuk setiap perubahan jadwal operasi yang terjadi akibat uncertainty case. Namun, algoritma ini hanya mengelola perubahan jadwal akibat keterlambatan penyelesaian operasi elektif, yang merupakan salah satu uncertainty case, pada penelitian sebelumnya. Oleh karena itu, penelitian ini menerapkan algoritma resilience concept dalam menangani kasus gawat darurat (emergency case), dan perubahan waktu pelaksanaan operasi elektif menjadi lebih awal. Kinerja algoritma resilience concept dibandingkan dengan algoritma rule-based dalam mengelola jadwal operasi untuk uncertainty case. Terdapat 20 skenario pengujian diujicobakan kepada kedua algoritma, yang terdiri dari 12 skenario pengujian perubahan jadwal operasi elektif dan 8 skenario emergency case . Kedua algoritma 100% berhasil mengeksekusi semua skenario pengujian. Akan tetapi, keduanya belum dapat memberikan prioritas perubahan jadwal berdasarkan tingkatan resiko. Ketidakoptimalan perhitungan waktu keterlambatan sumber daya (Tn) menjadi penyebab algoritma Resilience belum dapat memberikan prioritas solusi berdasarkan nilai resiko yang dihasilkan.Kata Kunci: Jadwal Operasi, Resilience Concept, Rule-Based, Uncertainty Case, Emergency Case.

Steps towards the upgrading of a municipal WWTP affected by nitrification inhibiting compounds - a case study

The influent to the municipal WWTP of Linz consists of typical domestic sewage and of the discharges of two major industries which results in a severe basic inhibition of nitrification. In the course of a 3-year investigation program, intensive studies were carried out. Pilot investigations showed the nitrification inhibiting properties of this wastewater. On the basis of the operational data, the variation in the inhibition of the maximum specific growth rate was evaluated. In addition, testing procedures which revealed the sources of inhibition - firstly within the catchment area and subsequently inside the industries concerned - were developed. With the results of these tests, risk assessment and a priority schedule became feasible. Based on the information gathered this way and on future steps which will be taken by the industries, major decisions concerning the upgrading of the existing activated sludge plant could be made.