Application of interval-valued triangular fuzzy numbers and their functional to the healthcare problems

Aim. In healthcare field there exist different types of uncertainty due to medical error generated by human and technologies. In general the crisp value generate loss of precision and inaccuracy about result and therefore the available data is not sufficient to assessed clinical process up to desired degree of accuracy. Therefore fuzzy set theory play as an important and advance role in accuracy of results in healthcare related problems. Methods. Here for more accuracy of result, we use functional fuzzy numbers in this paper. This study uses a new fuzzy fault tree analysis for patient safety risk modelling in healthcare. In this paper we will use level (λ, ρ) interval-valued triangular fuzzy number, their functional, t-norm operation and centre of gravity defuzzification method to evaluate fuzzy failure probability and estimate reliability of system. The effectiveness of these methods is illustrated by an example related to healthcare problems and then we analyse the result obtained with the other existing techniques. Tanaka et al.’s approach has been used to give the rank of basic events of the considered problems. Also, we use functional of fuzzy numbers to analyse the change in fuzzy failure probability. Results. The paper examines the application of the failure tree, t-norm and functional fuzzy numbers in the context of interval-valued triangular fuzzy numbers. The research examined two types of healthcare-specific problems and the corresponding defuzzification techniques for the purpose of reliability analysis using the existing methods. The authors concluded that t-norm is not associated with significant accumulation and identified how a functional fuzzy number affects reliability. Similarly, using the V index method, the least critical events were found for each system.

Rancangan Perbaikan Produktivitas Terhadap Perubahan Design di Departemen Produksi Sewing

Penelitian ini bertujuan untuk mengidentifikasi faktor dominan yang menyebabkan turunnya produktivitas pada proses produksi Busana Muslim Rabbani Line 4A di CV. Y. Metode yang digunakan pada penelitian ini yaitu metode OMAX (Objective Matrix), FTA (Failure Tree Analysis) untuk mengidentifikasi faktor dominan yang meyebabkan turunnya produktivitas karena adanya pergantian desain produk, dan perbaikannya dengan metode SMED (Single Minute Exchange Of Die). Hasil dari penelitian ini didapatkan faktor dominan penyebab turunnya produktivitas yaitu faktor jam kerja, dimana karena adanya pergantian desain menyebabkan semua mesin harus ada proses set-up. Berdasarkan metode SMED sebagai metode untuk perbaikan diketahui waktu set-up setiap mesin pembuatan busana muslim mengalami penurunan sebesar 7 menit/mesin dengan memisahkan internal set-up (kegiatan yang hanya dilakukan pada saat mesin berhenti) dan eksternal set-up (kegiatan set-up yang dapat dilakukan saat mesin berjalan), waktu set-up sebelum penerapan SMED sebesar 551 menit/line (19 mesin), sedangkan waktu set-up sesudah penerapan SMED dapat diturunkan sebesar 133 menit/line, maka penurunan waktu set-up sebesar 24% setiap ada proses set-up mesin.

PERBAIKAN KUALITAS PRODUK MENGGUNAKAN METODE FAULT TREE ANALYSIS (FTA) DAN FAILURE MODE AND EFFECT ANALYSIS (FMEA) DI PT. IFMFI, SURABAYA

Produk cacat merupakan barang atau jasa yang dibuat dalam proses produksi namun memiliki kekurangan yang menyebabkan mutunya menurun. Pengaruh produk cacat pada perusahaan berdampak pada biaya dan kualitas yang dihasilkan. Semakin banyak produk cacat maka semakin besar pula biaya yang dikeluarkan. PT. IFMFI memiliki permasalahan dalam penurunan kualitas produk yg dihasilkan belum memenuhi standar dan yang menjadi penyebab menurunnya kualitas produk roti tawar biasa meliputi berbagai kecacatan yaitu Cacat Berlubang , Cacat Gosong ,Cacat Penyok, Cacat Bantat, Cacat Over Fermentasi. Tujuan penelitian yaitu mengidentifikasi penyebab kecacatan dengan metode FTA dan menentukan usulan perbaikan serta metode FMEA Untuk mengatasi permasalahan kualitas produk tersebut adalah dengan cara menggunakan dua metode yaitu Failure Tree Analysis (FTA) Fault Failure Mode and Effect Analysis (FMEA. Berdasarkan analisis cacat produk roti dari proses produksi yg berlangsung telah teridentifikasi dari 5 jenis cacat terdapat 3 cacat yang tertinggi yaitu cacat berlubang dengan nilai probabilitas 6,5 % , cacat gosong dengan nilai probabilitas 5,9 % dan cacat bantat dengan probabilitas 6,9 %.

MENINGKATKAN EFISIENSI LINE ASCD-01 DENGAN MENURUNKAN LOSS TIME PROSES GANTI MODEL PADA POS TORSIONAL CHARACTERISTIC DI PT AII

Abstrak—Dengan meningkatnya permintaan konsumen dan semakin ketatnya persaingan pasar menuntut PT AII untuk selalu membuat produk yang berkualitas tinggi, tidak terkecuali pada produk Clutch Disc. Untuk memenuhi kebutuhan tersebut, PT AII membuat kebijakan untuk meningkatkan efisiensi line produksi minimal 92%. Hal ini dimaksudkan agar tidak terjadi keterlambatan dalam pengiriman produk ke konsumen. Namun aktualnya efisiensi Line ASCD-01 Clutch Disc masih di angka 89,5%. Untuk mengatasi masalah tersebut, dilakukan analisa efisiensi Line ASCD-01 dan ditemukan masalah utama, yaitu line stop tinggi yang disebabkan karena proses ganti model. Selanjutnya dilakukan analisa menggunakan Failure Tree Analysis (FTA) dan metode why-why untuk menemukan akar masalahnya. Dari hasil analisa didapatkan akar masalah, yaitu waktu pergantian backing plate lama. Hal ini karena backing plate tidak bisa digunakan untuk semua model Clutch Disc di Line ASCD-01 sehingga perlu penggantian backing plate setiap kali ganti model. Dari akar masalah tersebut dilakukan perbaikan yang diharapkan dapat mengurangi waktu ganti model yang berakibat pada peningkatan efisiensi Line ASCD-01. Setelah dilakukan perbaikan dan pengujian, waktu ganti model di Line ASCD-01 menurun dari 150 detik menjadi 102 detik. Selain itu, efisiensi Line ASCCD-01 meningkat dari 89,5% menjadi 91,7%. Kata Kunci : Ganti model, Efisiensi, Backing plate, Clutch Disc, Line stop.

Analisis Kualitas Produk Dengan Menggunakan Metode FMEA dan Fault Tree Analisys (FTA) Di Exotic UKM Intako

Small and medium business of industrial bags and suitcases intako located in tanggulangin sidoarjo is a center producing varrious products such as bags, suitcases, and jacket in exotic store. Along with the increasing amount of production it must be coupled with the improvement of quality in order to be able to meet customer satisfaction. But in production activities often experience some obtacles one of them is product defect caused by human error and engine factor. This study uses the method Failure Mode and Effect Analysys (FMEA) to identify each stage of the process and the method Failure Tree Analisys (FTA) to find the root couse of failure . there are 6 potential failures ot the 4 production process of making bags with the highest RPN value such as sewing machine often having trouble with the value of RPN 504 and there are 12 basic event of FTA tree error depiction affecting product quality in exotic UKM intako.

INFLUENCE OF USE COMPLETENESS OF ENGINEERING SYSTEM MODEL UPON ACCURACY AND ADEQUACY OF RELIABILITY ASSESSMENT

An overall purpose of researches – improvement of assessment methods of engineering systems reliability at the stage of design. To achieve the end specified within the bounds of the investigation there was established that one of the most significant factors defining the effectiveness of the reliability assessment at the stage of designing is the completeness of a model used. For the assessment of model completeness by the example of a failure tree it was offered to determine a correlation between levels of a logical model of reliability and kinds of engineering consistency regulated by RSS 30709-2002 “Engineering Consistency. Terms and Definitions”. Within the bounds of the paper there is analyzed a minimum set of the sorts engineering consistency (dimensional consistency of system elements, compatibility of ele-ments according to reliability, interoperability) the account of which requires various degrees of detailed elaboration of a model and supposes the existence of corresponding source data including those established at the identification of logic connections between failures and the analysis of possible failures caused by a common reason. For the systematization of research results there is developed a matrix of correlation of analyzed kinds of engineering consistency with the levels of a failure tree and the values of the assessment of a quadratic means of deviation (QMD) of expected results. The mathematical dependences allowing the definition of QMD values at every level of the logic model of relia-bility are developed. To account for the progressive-ness of a QMD value at the decrease of assessment reliability by analogy with Taguchi function of losses it is offered to use a parabolic dependence. The approach offered is particularly urgent for methods where the accuracy of results obtained determines the degree of a risk of manufacturers caused by wrong or untimely management or technical decision-makings. The trend of risk changes for manufacturers depending on QMD of a resultant value allows explaining diagrams presented in the paper. The results obtained explain the dependence of accuracy and reliability of a reliability assessment on the completeness of use of the model and show a trend of the influence of parameters pointed out upon risk probability of manufacturers at the decisionmaking at the stage of designing.

Modeling the Failure Tree Analysis for Safety-Critical Systems in the Production of Hazardous Materials

During a manufacturing process of automotive clutch an explosive substance – xenon is produced. Concentration of this substance must be monitored. Implementation of controls is performed by a safety-critical functions control system.Among main role during the process of risk assessment analysis belong determination of danger and dangerous events associated with the devices. Proactive planning errors and the use of appropriate standards can greatly reduce formation disorders thereby reducing the probability of dangerous consequences. The standard safety subsystems architectures and computation methods for determining the failure intensity is listed in the standards IEC 61508 and IEC 61511. These standards contain information tables with the results of these computations for selected parameter values.We propose a complete failure probability model for the safety functions of the control system. This model is designed to compute the intensity of the critical failure for the standard channel architectures.These architectures were designed with respect to the standard IEC 61508 and were implemented in Matlab.