WORK3203 comparable value


The University of Sydney WORK3203: Gender, Diversity & Inclusion at

Work Lecture 3: Gender in Organisations Lecturer: Christine Han, PhD The University of Sydney I acknowledge the tradition of

custodianship and law of the Country on

which I live and work - the Gadigal Lands

of the Gadigal People of the Eora Nation. I

pay my respects to those who have cared

and continued to care for Country. Map of Indigenous Australia:

https://aiatsis.gov.au/explore/map-indigenous-australia Acknowledgement of Country Page 3The University of Sydney – Gender in Organisations –Women at Work –Men at Work – Diverse genders at Work (Week 9) Questions? Agenda The University of Sydney Lecture 3: Gender in Organisations – Men and

Women at Work Page 6The University of Sydney “Using a gender lens brings many issues to the fore,

but none more frequently than work patterns that create

painful conflicts between work and personal life for

both men and women” (Rapoport et al 2002:11) Why look at gender in organisations through a

gender lens? Page 7The University of Sydney – Paid work: work done for pay, part-time, full-time, contract,

self-employed – Unpaid work: housework and caring work, done without pay,

and usually by women.

– Inequality markers (Baird & Heron 2019): working hours gap,

gender pay gap and superannuation gap

– Gender pay gap: measures the difference between the

average earnings of women and men in the workforce

Concepts Page 8The University of Sydney – Superannuation (‘Super’): Retirement savings in Australia,

paid by employer, 10% of salary – Occupational Gender Segregation: describes how the

workforce in Australia is segregated by gender.

– Female dominated industries = healthcare, social assistance,

education and training –Male dominated industries = construction and transport,

mining, electricity, gas, water Concepts continued Page 10The University of Sydney Inequality markers (Baird & Heron, 2019) ? Working Hours Gap: More

women work part-time hours

than men ? Gender Pay Gap: Australian

women earn less than

Australian men ? Superannuation Gap:

Australian women retiring

with less Superannuation than

men Photo by Wesley Tingey Page 11The University of Sydney 1. Working Hours Gap Women’s Workforce Participation (WGEA 2022) – 59.5% of tertiary education enrollments are women – 47.9% of all employed persons in Australia are women – Yet women make up 68.5% of all part-time employees – Some choose to work part-time – Childcare costs high – Tax incentive structures – Workforce participation rate = 62.1% women and 70.4%

men Inequality Markers (Baird and Heron 2019) Page 12The University of Sydney 2. Gender Pay Gap: measures the difference between the

average earnings of women and men in the workforce

– Equal Pay: equal pay for work of equal or comparable value – Calculated yearly by WGEA using ABS data

13.8 % National Gender Pay Gap (WGEA 2022) – Women’s average weekly ordinary full-time earnings across

all industries and occupations = $1591.20 vs men’s at

$1846.50 (difference of $255.3 per week) Inequality Markers (Baird and Heron 2019) Page 19The University of Sydney We will explore more on this topic in tutorials What factors may be contributing to the gender pay

gap? Page 24The University of Sydney Link between men’s contribution to unpaid domestic work and

gender equality: – Women can work more hours in paid work – Decreases within household gender pay gap – Shifts societal norms around gender roles – Benefits to children, girls, fathers, organisations and society – Daughters of mothers who worked more likely to earn higher

incomes

– Father benefits: health, wellbeing, better relationships with

children –Organisations: productive employees, satisfied with worklife

balance Women’s disproportionate share of unpaid domestic

and caring work Page 25The University of Sydney – Workplace flexibility and paternity leave encourage men’s

participation in unpaid domestic work

– And, recent research in Australia has found that young men have

a desire to be involved fathers (Hill et al 2019) –Workplace flexibility – Paternity leave is time men take off upon the birth of the child

– Yet uptake of both workplace flexibility and paternity leave by

men are low in Australia (Borgkvist et al 2018; Moran &

Koslowski 2019, WGEA 2020) Men’s access to and uptake of workplace flexibility

and paternity leave Page 26The University of Sydney – Men face barriers when they try to access due to: – Ideal/Universal worker norm (Acker 1990) – Co-worker/managerial perceptions (Borgkvist et al 2018) – Flexibility stigma (Coltrane et al 2013) – Reserved for women (Crabb 2019, Borgkvist et al 2018,

Coltrane et al 2013; Rehel 2014). – Men, the gig economy, flexible work and gender roles Men’s access to and uptake of workplace flexibility

and paternity leave Page 27The University of Sydney 1. Working Hours Gap 2. Gender Pay Gap 3. Superannuation Gap Back to the Inequality Markers… (Baird & Heron

2019) Page 28The University of Sydney 3. Superannuation Gap Superannuation (‘Super’): Retirement savings in Australia, paid

by employer, 11% of salary Superannuation gap = 20.5% (WGEA 2020) – More elderly women living in poverty

– Increase over 30% in homelessness of elderly women – Lower levels of financial literacy make money management

difficult

One more gap: Leadership Gap

Inequality Markers (Baird and Herson 2019) Page 29The University of Sydney – Inequality markers perpetuated by policy, gender norms and

organistions that favour the ideal/universal worker – Women do more unpaid caring and domestic work than men – There is a link between men’s participation in domestic and

caring work and gender equality – When men try to access enablers of this (flexible work and

parental leave) they face barriers – Recent research finds that young Australian men want to

participate in unpaid work; organisations shifting policies around

this – helps both men and women! – But the current state still plagued by inequality markers: hours

gap, gender pay gap and Superannuation gap – …And leadership gap! To conclude men and women at work Page 40The University of Sydney Questions? The University of Sydney Thank You!

 

【四轴飞行器】非线性三自由度四轴飞行器模拟器研究(Matlab代码实现)内容概要:本文围绕非线性三自由度四轴飞行器的建模与仿真展开,重点介绍了基于Matlab的飞行器动力学模型构建与控制系统设计方法。通过对四轴飞行器非线性运动方程的推导,建立其在三维空间中的姿态与位置动态模型,并采用数值仿真手段实现飞行器在复杂环境下的行为模拟。文中详细阐述了系统状态方程的构建、控制输入设计以及仿真参数设置,并结合具体代码实现展示了如何对飞行器进行稳定控制与轨迹跟踪。此外,文章还提到了多种优化与控制策略的应用背景,如模型预测控制、PID控制等,突出了Matlab工具在无人机系统仿真中的强大功能。; 适合人群:具备一定自动控制理论基础和Matlab编程能力的高校学生、科研人员及从事无人机系统开发的工程师;尤其适合从事飞行器建模、控制算法研究及相关领域研究的专业人士。; 使用场景及目标:①用于四轴飞行器非线性动力学建模的教学与科研实践;②为无人机控制系统设计(如姿态控制、轨迹跟踪)提供仿真验证平台;③支持高级控制算法(如MPC、LQR、PID)的研究与对比分析; 阅读建议:建议读者结合文中提到的Matlab代码与仿真模型,动手实践飞行器建模与控制流程,重点关注动力学方程的实现与控制器参数调优,同时可拓展至多自由度或复杂环境下的飞行仿真研究。
<think>好的,我需要处理用户的问题:“sharding value must implements comparable”。首先,我需要理解用户的问题到底是什么。用户可能在使用某种分库分表(sharding)的框架或库时遇到了错误,提示分片的值必须实现可比较(comparable)。所以用户需要了解为什么这个错误会出现,以及如何解决它。 首先,我应该回顾一下分片(Sharding)的基本概念。分片是一种将数据分散到多个数据库或表中的技术,通常用于处理大规模数据,提高性能和扩展性。分片的关键在于如何决定某条数据应该存放在哪个分片中,这通常通过分片键(sharding key)的值来决定。分片键的值需要经过某种计算(如哈希、范围等)来确定目标分片。 接下来,错误信息指出分片的值必须实现“comparable”。在编程中,“comparable”通常指的是对象能够进行比较操作,例如在Java中,对象需要实现Comparable接口,或者在Go语言中,类型需要支持比较操作符(如==, <, >等)。如果分片的值没有实现这些比较方法,框架可能无法正确地将数据路由到相应的分片,导致错误。 我需要考虑用户可能使用的编程语言。不同的语言对“comparable”的实现方式不同。例如,在Java中,如果分片键的类型没有实现Comparable接口,那么在排序或比较时就会抛出类似的错误。而在Go中,类型必须支持比较操作符,否则在作为map的键或需要排序时会出现问题。因此,用户的问题可能涉及Java、Go或其他类似语言。 接下来,我需要解释为什么分片值需要可比较。分片策略通常依赖于分片键的值进行范围查询、排序或哈希计算。例如,范围分片(Range Sharding)需要根据分片键的值范围来分配数据,这要求分片键的值能够被比较大小。如果分片键的类型无法比较,那么这种分片策略就无法正常工作,导致框架抛出错误。 然后,我需要给出解决方案。用户需要确保他们用作分片键的类型实现了必要的比较方法。例如,在Java中,自定义类需要实现Comparable接口,并重写compareTo方法。在Go中,如果使用结构体作为分片键,需要确保结构体的所有字段都是可比较的,或者实现相应的比较方法。此外,用户可能需要检查框架的文档,了解具体的分片键要求,以确保符合框架的预期。 可能的误区包括用户使用了不可比较的类型(如包含不可比较字段的结构体),或者自定义类型未正确实现比较接口。需要提醒用户检查分片键的类型,并确保其可比较性。 另外,可能还需要考虑不同分片策略对分片键的要求。例如,哈希分片可能不需要分片键可比较,但范围分片需要。用户可能需要根据所选的分片策略调整分片键的类型或实现。 最后,应该给出代码示例,说明如何在不同语言中实现可比较的分片键类型,以及如何避免常见的错误。这有助于用户更直观地理解和应用解决方案。</think>--- **当遇到错误提示“sharding value must implements comparable”时,通常是因为在分片(Sharding)设计中,分片键(Sharding Key)的值需要支持比较操作**。以下是详细解释和解决方案: --- ### **1. 问题背景** 在分库分表(Sharding)场景中,**分片键的值决定了数据如何分布到不同的分片(如数据库或表)**。某些分片策略(如范围分片、排序分片)要求分片键的值具备**可比较性**(Comparable),例如: - **范围分片(Range Sharding)**:根据值的范围(如 `0-100`、`101-200`)分配数据。 - **排序分片(Sorted Sharding)**:需对分片键排序后均匀分布数据。 如果分片键的值无法被比较(例如类型不支持 `<`, `>`, `==` 等操作),框架或数据库会抛出类似错误。 --- ### **2. 根本原因** - **不可比较的类型**:分片键的类型未实现比较逻辑(如自定义类、复杂对象)。 - **框架要求**:使用的分片框架(如 Apache ShardingSphere、MyCAT)强制要求分片键可比较。 --- ### **3. 解决方案** 根据编程语言和框架的不同,需确保分片键的值支持比较操作: #### **场景 1:使用基本类型(推荐)** - **直接使用可比较的基础类型**(如整数、字符串、日期)。 - 例如: ```java // Java 示例:使用 Long 类型作为分片键(已实现 Comparable) Long userId = 123456L; ``` #### **场景 2:自定义类型需实现比较逻辑** - **在 Java 中实现 `Comparable` 接口**: ```java public class OrderId implements Comparable<OrderId> { private final String id; public OrderId(String id) { this.id = id; } @Override public int compareTo(OrderId other) { return this.id.compareTo(other.id); } @Override public boolean equals(Object obj) { // 实现 equals 和 hashCode } } ``` - **在 Go 中实现比较方法**: ```go type CustomKey struct { ID int Name string } // 实现 Less 方法(例如用于排序) func (k CustomKey) Less(other CustomKey) bool { if k.ID != other.ID { return k.ID < other.ID } return k.Name < other.Name } ``` #### **场景 3:分片策略选择** - 如果分片键无法比较,改用 **哈希分片(Hash Sharding)**: ```sql -- 例如在 MySQL 分表时使用 HASH 函数 CREATE TABLE orders_0 (id BIGINT, ...) ENGINE=InnoDB; CREATE TABLE orders_1 (id BIGINT, ...) ENGINE=InnoDB; -- 根据 id 的哈希值分片 SELECT * FROM orders_${id % 2} WHERE id = 123; ``` --- ### **4. 常见错误示例** #### **错误:使用不可比较的复杂对象** ```java // Java 示例:自定义类未实现 Comparable public class UserLocation { private double latitude; private double longitude; // 未实现 compareTo 方法 } // 分片键为 UserLocation 类型时,抛出异常 ShardingKey key = new UserLocation(39.9042, 116.4074); ``` #### **修复:添加比较逻辑** ```java public class UserLocation implements Comparable<UserLocation> { private double latitude; private double longitude; @Override public int compareTo(UserLocation other) { int latCompare = Double.compare(this.latitude, other.latitude); return (latCompare != 0) ? latCompare : Double.compare(this.longitude, other.longitude); } } ``` --- ### **5. 分片框架中的注意事项** - **Apache ShardingSphere**: - 分片键需实现 `Comparable` 以支持范围查询(如 `BETWEEN`)。 - 配置示例: ```yaml rules: - !SHARDING tables: orders: actualDataNodes: ds_${0..1}.orders_${0..1} tableStrategy: standard: shardingColumn: order_id shardingAlgorithmName: order_table_range ``` - **MongoDB 分片集群**: - 分片键需支持范围或哈希操作: ```javascript // 范围分片键需可比较 sh.shardCollection("test.orders", { "order_date": 1 }); // 哈希分片键无需可比较 sh.shardCollection("test.users", { "user_id": "hashed" }); ``` --- ### **6. 总结** | **问题根源** | **解决方案** | **适用场景** | |-----------------------------|------------------------------------------|---------------------------| | 分片键类型不可比较 | 改用基础类型或实现 `Comparable` | 自定义类型作为分片键 | | 分片策略依赖范围比较 | 选择哈希分片或其他无需比较的策略 | 无法修改分片键类型时 | | 框架强制要求分片键可比较 | 检查框架文档并实现对应接口 | 使用 Apache ShardingSphere 等框架 | **核心原则**:确保分片键的类型与分片策略匹配。若需范围查询,必须实现比较逻辑;若无需排序,可优先选择哈希分片。
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值