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Jayprakash G Patankar - One of the best experts on this subject based on the ideXlab platform.
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warranty costs for repairable products with a two attribute policy impact of warranty Execution
International Journal of Operational Research, 2006Co-Authors: Amitava Mitra, Jayprakash G PatankarAbstract:A warranty policy involving two attributes, for example time and usage, is considered. Usage is assumed to be related to time through the usage rate, considered to be a random variable satisfying a specified probability distribution. The paper analyses a policy where the product is repaired on failure within the specified parameters but warranty is not renewed. The failure distribution of the repaired items is assumed to be different from the failure distribution of new items. Furthermore, the situation that warranty may not be executed all the time is incorporated. Consumer behaviour is modelled through a warranty Execution Function.
Hunkyung Kim - One of the best experts on this subject based on the ideXlab platform.
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reliability and construct validity of a novel motor cognitive dual task test a stepping trail making test
Geriatrics & Gerontology International, 2020Co-Authors: Yosuke Osuka, Yutaka Watanabe, Narumi Kojima, Ryota Sakurai, Hunkyung KimAbstract:AIM This study aimed to examine the reliability and construct validity of the Stepping Trail Making Test (S-TMT) in community-dwelling older adults. METHODS This study comprised a cross-sectional study based on a population sample. Participants comprised 1224 community-dwelling older Japanese women aged 65-81 years without Functional disability, dementia, depression, Parkinson's disease, or cognitive and visual impairments. The S-TMT measured the time taken to step on a sequence of numbers (1-16) positioned on a mat (1 m2 ). Participants were instructed to step as quickly and accurately as possible. Motor Functions were assessed by walking speed and knee extensor strength tests, while cognitive Functions were assessed by the Symbol Digit Substitution Task (SDST) test, verbal and logical memory test, and TMT-A and -B. RESULTS As a result of test-retest reliability over 6 months, the intraclass correlation coefficients of the S-TMT was 0.82 (95% confidence interval, 0.68-0.90). An adjusted multiple regression model indicated that the S-TMT was significantly associated with walking speed for motor Function, and associated with the SDST, TMT-A and TMT-B for cognitive Functions (P < 0.001). CONCLUSIONS These results suggest that the S-TMT is a reliable dual-task test comprising mobility for motor Function and a visual-dependent Execution Function for cognitive Function in older women. Geriatr Gerontol Int 2020; 20: 291-296.
Amitava Mitra - One of the best experts on this subject based on the ideXlab platform.
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warranty costs for repairable products with a two attribute policy impact of warranty Execution
International Journal of Operational Research, 2006Co-Authors: Amitava Mitra, Jayprakash G PatankarAbstract:A warranty policy involving two attributes, for example time and usage, is considered. Usage is assumed to be related to time through the usage rate, considered to be a random variable satisfying a specified probability distribution. The paper analyses a policy where the product is repaired on failure within the specified parameters but warranty is not renewed. The failure distribution of the repaired items is assumed to be different from the failure distribution of new items. Furthermore, the situation that warranty may not be executed all the time is incorporated. Consumer behaviour is modelled through a warranty Execution Function.
L I Xianta - One of the best experts on this subject based on the ideXlab platform.
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diagnostic value of the memory and executive Function screening test in the assessment of cognitive impairment severity in alzheimer s disease
Chinese Journal of Clinical Neurosciences, 2013Co-Authors: L I XiantaAbstract:Aim To evaluate cognitive impairment profile in patients with mild cognitive impairment(MCI) and Alzheimer's disease(AD) of different severity with memory and Execution screening(MES) scale and explore the clinical value in the differential diagnosis of severity of AD patients with MES. Methods A total of 709 subjects(164 cases in normal control group, 137 cases in MCI group, 193 cases in mild AD group, 136 cases in moderate AD group, 79 cases in severe AD group) were implemented the Mini Mental State Examination (MMSE) and MES. Subjects were matched as regards to age, gender, educational level in each group. MMSE total scores and relevant indicators of MES were compared in each group. Genotyping of ApoE polymorphism was conducted on 621 subjects(NC, 136 cases; MCI, 116 cases; mild AD, 178 cases; moderate AD, 122 cases and severe AD, 69 cases) by amplification refractory mutation system(ARMS) with informed consent. Results Both MMSE total score and MES indexes showed a downward trend in these groups along with progression of cognitive impairment. There were significant differences in MMSE total scores, raw scores of ten items, factor scores and total scores of MES among the five groups during the pairwise comparisons(P0.01). They all showed a relatively balanced decline except that scores in sentence 5(i.e., free recall after an interval of about five minutes) demonstrating the fastest decline, while the ratio of memory to Execution Function(MES-R) in each group remained relatively stable(P0.05). The ability to learn did not change significantly between the normal control and MCI subjects, as well as between mild AD and moderate AD subjects(P0.05), implicating a plateau phenomenon, nevertheless the memory retention capability presented with a relatively balanced decrease(P0.01). There were no significant differences in total scores of either MES or MMSE between APOEe4 non-carriers group(223 cases) of AD patients and APOEe4 carriers group(146 cases) of AD patients, however APOEe4 non-carriers performed better on MES-M score than the APOEe4 carriers did while the MES-E showed the opposite direction, resulting a significantly different MES-R between these two groups(P0.01). Conclusion MES is less time-consuming, less education-dependent and is able to provide a general profile of cognitive impairment regarding as episodic memory, executive Function and other major cognitive domain, without ceiling or floor effects, with good resolution capability to patients with mild or severe cognitive impairment. It is easier to be carried out than CDR, and widely used to estimate AD severity.
Yosuke Osuka - One of the best experts on this subject based on the ideXlab platform.
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reliability and construct validity of a novel motor cognitive dual task test a stepping trail making test
Geriatrics & Gerontology International, 2020Co-Authors: Yosuke Osuka, Yutaka Watanabe, Narumi Kojima, Ryota Sakurai, Hunkyung KimAbstract:AIM This study aimed to examine the reliability and construct validity of the Stepping Trail Making Test (S-TMT) in community-dwelling older adults. METHODS This study comprised a cross-sectional study based on a population sample. Participants comprised 1224 community-dwelling older Japanese women aged 65-81 years without Functional disability, dementia, depression, Parkinson's disease, or cognitive and visual impairments. The S-TMT measured the time taken to step on a sequence of numbers (1-16) positioned on a mat (1 m2 ). Participants were instructed to step as quickly and accurately as possible. Motor Functions were assessed by walking speed and knee extensor strength tests, while cognitive Functions were assessed by the Symbol Digit Substitution Task (SDST) test, verbal and logical memory test, and TMT-A and -B. RESULTS As a result of test-retest reliability over 6 months, the intraclass correlation coefficients of the S-TMT was 0.82 (95% confidence interval, 0.68-0.90). An adjusted multiple regression model indicated that the S-TMT was significantly associated with walking speed for motor Function, and associated with the SDST, TMT-A and TMT-B for cognitive Functions (P < 0.001). CONCLUSIONS These results suggest that the S-TMT is a reliable dual-task test comprising mobility for motor Function and a visual-dependent Execution Function for cognitive Function in older women. Geriatr Gerontol Int 2020; 20: 291-296.