scispace - formally typeset
Search or ask a question
Author

Mohammad Reza Maleki

Bio: Mohammad Reza Maleki is an academic researcher from Isfahan University of Technology. The author has contributed to research in topics: Complementary good & Perishability. The author has an hindex of 1, co-authored 3 publications receiving 1 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the authors evaluated the impact of measurement errors on the performance of various control charts and found that, as far as we know, the multiple sampling control charts in the lite setting were not affected.
Abstract: In recent years, the impact of measurement errors on the performance of various control charts have been well evaluated. However, as far as we know, the multiple sampling control charts in the lite...

3 citations

Posted ContentDOI
TL;DR: Intramedullary nail holes laser indicator is a safe and accurate method that reduced surgical time and simplifies the process and makes it easier to interlocking the intramedULLary nail which can have good clinical applications.
Abstract: Interlocking of intramedullary nails is a challenging procedure in orthopedic trauma surgery. Numerous methods have been described to facilitate this process. But they are exposed patient and surgical team to X-rays or involves trial and error. An accurate and non-invasive method has been provided to easily interlocking intramedullary nails. By transferring a safe visible light inside the nail, a drilling position appears which use to drilling bone toward the nail hole. The wavelength of this light was obtained from ex-vivo spectroscopy on biological tissues which has optimal transmission, reflectance, and absorption properties. Moreover, animal and human experiments were performed to evaluate performance of the proposed system. Ex-vivo performance experiments were performed successfully on two groups of cow and sheep samples. Output parameters were procedure time and drilling quality which there were significant differences between the two groups in procedure time (P 0.05). Moreover, an In-vivo performance experiment was performed successfully on a middle-aged man. To compare the provided method, targeting-arm, and free-hand techniques, two human experiments were performed on a middle-aged and a young man. The results indicate the advantage of the proposed technique in the procedure time (P < 0.05), while the drilling quality is equal to the free-hand technique (P = 0.05). Intramedullary nail holes laser indicator is a safe and accurate method that reduced surgical time and simplifies the process. This new technology makes it easier to interlocking the intramedullary nail which can have good clinical applications.

2 citations

Journal ArticleDOI
31 Oct 2021
TL;DR: In this article, a hybrid model by integration of inventory planning, pricing and maintenance policies is proposed, which considers both the freshness and the technology level used in production process in which the former has a great impact on demand for perishable products, while the latter has a crucial impact on component's failures.
Abstract: An efficient inventory system is considerably affected by two important factors including the demand and production rates. The value of demand rate depends on the product’s price and the customer waiting time for product while the production rate is dependent on the maintenance strategy. Taking into account the production process of two perishable complementary products, a hybrid model by integration of inventory planning, pricing and maintenance policies is proposed in this paper. The proposed model considers both the freshness and the technology level used in production process in which the former has a great impact on demand for perishable products, while the latter has a crucial impact on component’s failures. To elaborate the capability of the proposed mathematical model, three illustrative examples are considered. The first example proves the importance of implementing maintenance strategy to maximize the manufacturer's total profit. The second study explores the impact of product’s perishability on the manufacturer's profit under various perishing coefficients while the third one indicates the importance of taking the product’s freshness into account on the value of exact profit. The sensitivity analysis is undertaken to study how the objective function and decision variables can be affected by the model parameters.

Cited by
More filters
Journal ArticleDOI
TL;DR: In this article , the adverse effect of measurement errors on detecting performance of triple sampling (TS)- control chart based on an additive covariate model is investigated. And three multiple measurement based triple sampling schemes are developed to reduce the undesired impact of imprecise measurements on performance of TS- chart.
Abstract: ABSTRACT The presence of measurement errors can seriously alter the statistical performance of Phase II control charts. Up today, no research on designing the triple sampling control charts taking into account the gauge measurement errors is reported in the existing literature. In this paper, we study the adverse effect of measurement errors on detecting performance of triple sampling (TS)- control chart based on an additive covariate model. Three multiple measurement based triple sampling (MMBTS) schemes are developed to reduce the undesired impact of gauge inability on detecting performance of TS- chart. Through simulation studies in terms of average run length (ARL) and standard deviation of run length (SDRL), it is indicated that the run length characteristics of the TS- is significantly affected by the measurement errors. The results also confirm that all proposed remedial approaches can effectively reduce the undesired impact of imprecise measurements on performance of TS- chart. A sensitivity analysis is also carried out to evaluate how the covariate model parameters affect the detection performance of the TS- chart. Finally, using a real industrial data obtained from the spring production system, we demonstrate the performance of TS- chart when the measurement errors exist.

4 citations

Patent
23 Sep 2005
TL;DR: The present invention relates to a co-planar (coplanar) X- ray induction methods and apparatus for inserting a fixing screw distal (distal) in the bone intramedullary nail (bone intrameastern nail).
Abstract: The present invention relates to a co-planar (coplanar) X- ray induction methods and apparatus for inserting a fixing screw distal (distal) in the bone intramedullary nail (bone intramedullary nail). Apparatus of the present invention have a co-planar holes to allow insertion of the protective sleeve. Drills and bone screws can be inserted through the protection sleeve. Radiopaque target in the aiming arm (aiming arm) markers allows for easy positioning of the X- ray source to be coplanar with the X- ray beam is collimated arm cross-holes (transverse holes). After the X- ray light source holding the exact orientation, of the single X- ray snapshot is sufficient to evaluate the implanted intramedullary metal defined accurate strain. X- ray beam is not intramedullary nail holes is coaxial with the need jeokil. Aiming arm has a fixed area, fixed to the movable region (mobile portion) and the nail, aiming arm can be adjusted, it is possible to replace the movable region over a fixed area to compensate for after transplantation intramedullary metal defined strain . As long as the aiming arm accurately position, the aiming arm cross-holes and the intramedullary nail holes are accurately aligned, the protective sleeve are inserted through the aiming arm hole, bone drills are the near the intramedullary nail hole and the bone material and drilling through, bone screws are inserted to fix the intramedullary nail to the bone. Intramedullary nail (intramedullary nail), X- ray revulsion, distal fixing, a screw, a drill, aiming arm (aiming arm)

1 citations

Journal ArticleDOI
TL;DR: Li et al. as discussed by the authors designed a laser guiding navigation device and compared with the traditional freehand (FH) technique in the distal locking of femoral diaphyseal fracture.
Abstract: Intramedullary nail (IMN) is one of the key essential minimally invasive "weapons" in orthopaedic trauma, while the distal locking is still challenging for surgeons. Although there are various inventions and technologies to improve the locking procedure, there are still problems such as inaccurate positioning, excessive radiation exposure, low first success rate and long learning curve. Therefore, a new laser guiding navigation device was designed and compared with the traditional freehand (FH) technique in the distal locking of femoral IMN.This randomized controlled single-blind trial recruited patients with femoral diaphyseal fracture. The self-designed laser navigation device (laser group) and freehand technique (FH group) were used in the distal locking of the IMNs. The patients enrolled were randomized into FH group and laser group, all operations were performed by two surgeons of the same level. The differences between the two groups were compared in terms of radiation exposure time, operative time, first success rate, blood loss, visual analogue score (VAS), Harris score and healing time.32 patients ended the study period and 16 patients in each group. The results showed that the laser group was better than the FH group in terms of distal locking time (10(9/11) vs 19.5 (17.25/21) min, Z = 4.83, P < 0.001), distal locking radiation exposure time (46.5 (41.25/51.75) vs 105 (88.25/140) s, Z = 4.807, P < 0.001), first success rate (30/32 vs 20/32, χ2 = 9.143, P = 0.002) and blood loss (60 (50-100) vs 150 (105-192.5) mL, Z = 3.610, P = 0.0003). There was no difference in Harris score, VAS score, or fracture healing time between the two groups.Compared with the FH technique, the novel laser guiding navigation device for distal locking of femoral IMN has the advantages of shorter operative time, less radiation exposure and higher first success rate. Trial registration Chinese Clinical Trial Registry, ChiCTR2200060236. Registered 23 May 2022, https://www.chictr.org.cn/showprojen.aspx?proj=169130.
Journal ArticleDOI
TL;DR: In this paper , a generalized multiple dependent state sampling (GMDS) chart based on ridge penalized likelihood ratio (RPLR ) statistic is developed for Phase II monitoring of multivariate process variability under high-dimensional setting.