Search results for: Nasrullah Khan

Items from 1 to 20 out of 24 results

article

Design of Control Chart for Processes with Multiple Independent Manufacturing Lines

Muhammad Aslam, Nasrullah Khan, Chi-Hyuck Jun

Iranian Journal of Science and Technology, Transactions A: Science > 2017 > 41 > 4 > 901-908

It is common in industry to manufacture the product using the multiple lines to meet the customer demand. In this manuscript, the designing of control chart for processes with multiple independent lines is presented. The control chart coefficients are determined for various levels of the specified average run length. The average run lengths for various shifts are given for different level of sample...

article

Group SkSP-R sampling plan for accelerated life tests

Muhammad Aslam, Nasrullah Khan, Chi-Hyuck Jun

Sādhanā > 2017 > 42 > 10 > 1783-1791

This study presents a group skip-lot sampling plan using resampling (SkSP-R) for accelerated life tests. It is assumed that the lifetime of a product follows Weibull distribution with known shape parameter under the use condition, while the scale parameter can be obtained from acceleration factor. The plan parameters are determined through a non-linear optimisation problem for fixed values of producer’s...

article

Design of a Control Chart Using a Modified EWMA Statistic

Nasrullah Khan, Muhammad Aslam, Chi‐Hyuck Jun

Quality and Reliability Engineering International > 33 > 5 > 1095 - 1104

In this paper, the design of a control chart is given using a modified exponentially weighted moving average statistic under the assumption that the quality characteristic of interest follows the normal distribution. The structure of the proposed control chart is developed, and the necessary measures are derived to find the average run length for in‐control and out‐of‐control processes. The efficiency...

article

Classification and ordination of understory vegetation using multivariate techniques in the Pinus wallichiana forests of Swat Valley, northern Pakistan

Inayat Ur Rahman, Nasrullah Khan, Kishwar Ali

The Science of Nature > 2017 > 104 > 3-4 > 1-10

An understory vegetation survey of the Pinus wallichiana-dominated temperate forests of Swat District was carried out to inspect the structure, composition and ecological associations of the forest vegetation. A quadrat method of sampling was used to record the floristic and phytosociological data necessary for the analysis using 300 quadrats of 10 × 10 m each. Some vegetation parameters viz. frequency...

article

Aging study of the powdered magnetite nanoparticles

Umar Saeed Khan, Abdur Rahim, Nasrullah Khan, Nawshad Muhammad, more

Materials Chemistry and Physics > 2017 > 189 > Complete > 86-89

Magnetite nanoparticles were produced via co-precipitation method and then stored at room temperature for 6 years in aerobic atmosphere. Variations in the inherent solid phase and solid interfacial properties of the prepared magnetite nanoparticles were investigated. For this purpose the fresh and aged samples were characterized using transmission electron microscopy, vibrating sample magnetometer,...

article

A mixed control chart adapted to the truncated life test based on the Weibull distribution

Nasrullah KHAN, Muhammad ASLAM, Kyung-Jun KIM, Chi-Hyuck JUN

Operations Research and Decisions > 2017 > 27 > 1 > 43-55

The design of a new mixed attribute control chart adapted to a truncated life test has been pre-sented. It was assumed that the lifetime of a product follows the Weibull distribution and the number of failures was observed using a truncated life test, where the test duration was specified as a fraction of the mean lifespan. The proposed control chart consists of two pairs of control limits based on...

article

A EWMA Control Chart for Exponential Distributed Quality Based on Moving Average Statistics

Nasrullah Khan, Muhammad Aslam, Chi‐Hyuck Jun

Quality and Reliability Engineering International > 32 > 3 > 1179 - 1190

We propose an exponentially weighted moving average (EWMA) control chart for monitoring exponential distributed quality characteristics. The proposed control chart first transforms the sample data to approximate normal variables, then calculates the moving average (MA) statistic for each subgroup, and finally constructs the EWMA statistic based on the current and the previous MA statistics. The upper...

article

Reducing maternal mortality in conflict areas: Surgical-anesthetic experience in Boost Hospital – Afghanistan

Gilda Izquierdo, Miguel Trelles, Nasrullah Khan

Colombian Journal of Anesthesiology > 2016 > 44 > 1 > 13-16

Helmand province, whose capital is Lashkar-Gah, is one of the most volatile provinces affected by the conflict in Afghanistan. Doctors without Borders began to work in Boost Hospital in 2009.Retrospective review of surgical procedures at the Doctors without Borders Operational Center in Brussels, February 11, 2010 to September 30, 2012.5719 surgeries were performed on 4334 patients. 47% were emergency...

article

Karakorum temperature out of phase with hemispheric trends for the past five centuries

Muhammad Usama Zafar, Moinuddin Ahmed, Mukund Palat Rao, Brendan M. Buckley, more

Climate Dynamics > 2016 > 46 > 5-6 > 1943-1952

A systematic increase in global temperature since the industrial revolution has been attributed to anthropogenic forcing. This increase has been especially evident over the Himalayas and Central Asia and is touted as a major contributing factor for glacier mass balance declines across much of this region. However, glaciers of Pakistan’s Karakorum region have shown no such decline during this time...

article

Mixed Control Charts Using EWMA Statistics

Muhammad Aslam, Nasrullah Khan, Mansour Sattam Aldosari, Chi-Hyuck Jun

IEEE Access > 2016 > 4 > 8286 - 8293

In this paper, two mixed control charts are designed for process monitoring when the quality characteristic of interest follows a normal distribution. The mixed control chart starts with monitoring the number of non-conforming items but switches to monitoring using exponentially weighted moving average (EWMA) statistic or hybrid EWMA statistic when the decision is indeterminate with the attribute...

article

A control chart using belief information for a gamma distribution

Muhammad ASLAM, Nasrullah KHAN, Chi-Hyuck JUN

Operations Research and Decisions > 2016 > 26 > 4 > 5-19

The design of a control chart has been presented using a belief estimator by assuming that the quantitative characteristic of interest follows the gamma distribution. The authors present the structure of the proposed chart and derive the average run lengths for in-control and a shifted process. The average run lengths for various specified parameters have been reported. The efficiency of the proposed...

article

A control chart for an exponential distribution using multiple dependent state sampling

Muhammad Aslam, Muhammad Azam, Nasrullah Khan, Chi-Hyuck Jun

Quality & Quantity > 2015 > 49 > 2 > 455-462

In this paper, we will present a control chart for exponentially distributed quality characteristics using multiple dependent state sampling. The proposed control chart has double control limits with two control coefficients, which is based on a normal approximation through transformation. The control coefficients are determined by considering the average run length (ARL) when the process is in control...

article

Parametric Quantification of Low GWP Refrigerant for Thermosyphon Driven Solar Water Heating System

Naeem Abas, Rab Nawaz, Nasrullah Khan

Procedia Computer Science > 2015 > 52 > Complete > 804-811

Modern lifestyle, growing industrial and economy thrive on energy which is getting expensive over time. Natural convection based systems are getting attraction for their promising heat transfer efficiency and zero energy utilization. Refrigerants having ozone depletion potential (ODP) and high Global Warming Potential (GWP) have been banned or under time bared permission under the Montreal (1987)...

article

Designing of a new monitoring t-chart using repetitive sampling

Muhammad Aslam, Nasrullah Khan, Muhammad Azam, Chi-Hyuck Jun

Information Sciences > 2014 > 269 > Complete > 210-216

In this article, we propose a new t-chart for monitoring a process under the assumption that the time between events follows the exponential distribution. The proposed t-chart has double control limits that use repetitive sampling and determine its control constants. The in-control and the out-of-control average run lengths are derived and tabulated according to various process shifts. The proposed...

article

Phytosociology, structure and dynamics of Pinus roxburghii associations from Northern Pakistan

Nasrullah Khan, Kishwar Ali, Shahid Shaukat

Journal of Forestry Research > 2014 > 25 > 3 > 511-521

We investigated the phytosociology, structure and dynamics of Pinus roxburghii in 40 stands in northern areas of Pakistan by using cluster analysis (Ward’s agglomerative clustering) and ordination (Nonmetric Multidimensional Scaling). Cluster analysis revealed three major groups associated with specific environmental characteristics: (1) P. roxburghii (2) Pinus-Quercus baloot and (3) Pinus-Olea ferruginea...

article

Future of Abies pindrow in Swat district, northern Pakistan

Kishwar Ali, Habib Ahmad, Nasrullah Khan, Stephen Jury

Journal of Forestry Research > 2014 > 25 > 1 > 211-214

Swat district is a biodiversity hub of Pakistan. The plant species, especially trees, in the Swat District are exposed to extinction threat from global climate change. Maximum entropy (MaxEnt) modelling of species distribution, using HADCM3 A2a global climate change scenario, predicted a considerable change in the future distribution of Abies pindrow (Royle ex D.Don) Royle. AUC (area under the curve)...

article

Five centuries of Upper Indus River flow from tree rings

Edward R. Cook, Jonathan G. Palmer, Moinuddin Ahmed, Connie A. Woodhouse, more

Journal of Hydrology > 2013 > 486 > Complete > 365-375

Water wars are a prospect in coming years as nations struggle with the effects of climate change, growing water demand, and declining resources. The Indus River supplies water to the world’s largest contiguous irrigation system generating 90% of the food production in Pakistan as well as 13gigawatts of hydroelectricity. Because any gap between water supply and demand has major and far-reaching ramifications,...

article

Climatic signal in tree-ring chronologies of Cedrus deodara from Chitral Hindukush Range of Pakistan

Nasrullah Khan, Moinuddin Ahmed, Syed Shahid Shaukat

Geochronometria > 2013 > 40 > 3 > 195-207

Tree-rings are an important tool for the investigation of paleoclimatic records for regions or periods of time with no instrumental climatic data. However, the responses of different species and sites to various climatic parameters are unusual. In the present study, we developed tree-ring-width chronologies of Cedrus deodara from three different sites of Chitral Hindukush range of Pakistan. The study...

article

Vegetation-environment relationships in the forests of Chitral district Hindukush range of Pakistan

Nasrullah Khan, Syed Shahid Shaukat, Moinuddin Ahmed, Muhammad Faheem Siddiqui

Journal of Forestry Research > 2013 > 24 > 2 > 205-216

We investigated the composition of plant communities to quantify their relationships with environmental parameters in the Chitral Hindukush range of Pakistan. We sampled tree vegetation using the Point Centered Quarter (PCQ) method while understory vegetation was sampled in 1.5-m circular quadrats. Cedrus deodara is the national symbol of Pakistan and was dominant in the sampled communities. Because...

chapter

Identification of delay factors in C-130 aircraft overhaul and finding solutions through data analysis

Nasrullah Khan, Irfan Anjum Manarvi

2011 Aerospace Conference > 1 - 8

2011 IEEE Aerospace Conference

C-130 aircraft is one of the most reliable military cargo aircraft¹². Its reliability makes it more lucrative for military users all around the world. It forms the backbone for tactical and transportation operations. To keep the transport aircraft fly worthy, aviation industry follows a stringent scheduled inspection program. Amongst the various scheduled programs the most comprehensive and costly...

Publication date

Last year (3)
Last 3 years (11)

Close

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

From:

To:
Set your own date range

INFONA - science communication portal

Search results for: Nasrullah Khan

Design of Control Chart for Processes with Multiple Independent Manufacturing Lines

Group SkSP-R sampling plan for accelerated life tests

Design of a Control Chart Using a Modified EWMA Statistic

Classification and ordination of understory vegetation using multivariate techniques in the Pinus wallichiana forests of Swat Valley, northern Pakistan

Aging study of the powdered magnetite nanoparticles

A mixed control chart adapted to the truncated life test based on the Weibull distribution

A EWMA Control Chart for Exponential Distributed Quality Based on Moving Average Statistics

Reducing maternal mortality in conflict areas: Surgical-anesthetic experience in Boost Hospital – Afghanistan

Karakorum temperature out of phase with hemispheric trends for the past five centuries

Mixed Control Charts Using EWMA Statistics

A control chart using belief information for a gamma distribution

A control chart for an exponential distribution using multiple dependent state sampling

Parametric Quantification of Low GWP Refrigerant for Thermosyphon Driven Solar Water Heating System

Designing of a new monitoring t-chart using repetitive sampling

Phytosociology, structure and dynamics of Pinus roxburghii associations from Northern Pakistan

Future of Abies pindrow in Swat district, northern Pakistan

Five centuries of Upper Indus River flow from tree rings

Climatic signal in tree-ring chronologies of Cedrus deodara from Chitral Hindukush Range of Pakistan

Vegetation-environment relationships in the forests of Chitral district Hindukush range of Pakistan

Identification of delay factors in C-130 aircraft overhaul and finding solutions through data analysis

Filter options

Publication date

Publication type

Keywords

Data set

Journal

INFONA - science communication portal

Search results for: Nasrullah Khan

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Publication type

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options