Compare tools by smart functionality, multi-function capability and durability for purchasing decisions.
工具研发常需在智能与耐用间权衡:智能评分反映联网/自动化程度,耐用评分反映寿命/可靠性。对比两者给出侧重路线;权重比量化两项相对占比,辅助资源投放决策。
| Item | Formula / Rule | Source / Standard |
|---|---|---|
| Weighted scoring | Composite score = Σ (weight × item score), with the weights summing to 1. | ISO 9241-11:2018, usability effectiveness, efficiency and satisfaction |
| Reliability index | R(t) = exp(-λt); with a constant failure rate λ, reliability decays exponentially. | IEC 60050-192:2015, dependability vocabulary |
| Life cycle cost | LCC = acquisition + operation + maintenance + disposal, discounted to present value before comparison. | ISO 15686-5:2017, life cycle costing |
创新(智能/多功能/耐用)研发。免费在线工具,纯前端处理,数据不上传,保护隐私安全。
工作与生活中的相关计算与查询。