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Using Differential Evolution Method to Solve Crew Rostering Problem

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Applied Mathematics 2010年第4期1卷 316-325页

作者： Budi santosa Andiek Sunarto Arief Rahman 不详

Airline crew rostering is the assignment problem of crew members to planned rotations/pairings for certain month. Airline companies have the monthly task of constructing personalized monthly schedules (roster) for crew members. This problem became more complex and difficult while the aspirations/criterias to assess the quality of roster grew and the constraints increased excessively. This paper proposed the differential evolution (DE) method to solve the airline rostering problem. Different from the common DE, this paper presented random swap as mutation operator. The DE algorithm is proven to be able to find the near optimal solution accurately for the optimization problem. Through numerical experiments with some real datasets, DE showed more competitive results than two other methods, column generation and MOSI (the one used by the Airline). DE produced good results for small and medium datasets, but it still showed reasonable results for large dataset. For large crew rostering problem, we proposed decomposition procedure to solve it in more efficient manner using DE.

关键词： Differential Evolution Crew Scheduling Pairing Rostering

The Upper Mixed Layer during Coastal Upwelling Events on the Northern Portugal Shelf

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Journal of Ocean University of Qingdao 2003年第2期2卷 147-154页

作者： ZUOJuncheng SHENGHong AlvaroPeliz santosa.Miguel OceanographyDepartment OceanUniversityofChinaQingdao266003P.R.China TourismDepartment OceanUniversityofChinaQingdao266003P.R.China InstituteofSeaandFisheriesResearchofPortugal Lisbon1449-006Portugal

The upper mixed layer (UML) depth obtained from temperature is very close to that from density:the maximum is about 15m. This indicates that temperature is a good indicator of mixed layer during measurements. When the surface heat flux is balanced by a cross-shore heat flux, the surface mixed layer depth obtained from the WM model (Weatherly and Martin, 1978),hPRT, is roughly the same as observed. The mixed layer depth calculated from the PWP model (Price, Weller and Pinkel, 1986) is close to the depth obtained from thermistor chain temperature data. The results show that both the WM model and PWP model can provide a good estimate of stratification in the study area during the cruise. The value of log( h/u3) is about 9.5 in the study area, which shows that the study area is strongly stratified in summer. Observations on the northern Portugal shelf reveal high variability in stability, giving rise to semi-diurnal, semi-monthly and diurnal oscillations, and long term variations. The fortnightly oscillations are highlighted by post-springs and post-neaps. The stirring of spring tide is reinforced by strong wind mixing which brings about complete vertical homogeneity everywhere. The semi-diurnal periodic stratification is very pronounced because the major axis of the tidal ellipse is orientated acrossshore, even though the tidal current is weak in this area, the maximum stratification is observed around the middle of ebb, and, the water at this time is much warmer. The diurnal oscillation results from the upper ocean response to heating and wind mixing when solar heating warms and stabilizes the upper ocean. There is a clear relationship between upper mixed layer depth and wind-stress magnitude at subtidal frequencies. Stronger winds result in a deeper surface mixed layer. Typically, the surface mixed layer depth lags the wind stress by 6 -12 h.

关键词： stratification upwelling upper mixed layer (UML) northern Portugal shelf

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拼装型自减震墙板钢框架抗震性能研究

拼装型自减震墙板钢框架抗震性能研究

作者： santosa WONGSO 广州大学

学位级别：硕士

为实现现有减震墙板在不同跨度框架中的灵活布置以及便于装配式结构的施工和标准化生产,本文将拼装型墙板和减震层相结合,提出一种新型拼装型自减震墙板结构体系。通过建立拼装型自减震墙板钢框架的有限元模型进行抗震性能研究,并对其... 详细信息

为实现现有减震墙板在不同跨度框架中的灵活布置以及便于装配式结构的施工和标准化生产,本文将拼装型墙板和减震层相结合,提出一种新型拼装型自减震墙板结构体系。通过建立拼装型自减震墙板钢框架的有限元模型进行抗震性能研究,并对其进行平面外性能研究和参数分析。主要内容和相应结论如下:(1)根据中国规范设计了拼装型自减震墙板,采用有限元模拟软件建立4个有限元模型:空钢框架试件(BSF)、墙—梁连接型减震墙板钢框架试件(BSF-DW)、拼装型自减震墙板钢框架(BSF-ASDW1和BSF-ASDW2),并进行抗震性能研究。研究结果表明:相比传统填充墙,拼装型自减震墙板可降低对框架的附加刚度和约束效应,提高结构的耗能能力。拼装型自减震墙板的拉应力均小于混凝土的抗拉强度,说明其减震机理合理且有效。(2)通过建立12个不同参数的拼装型自减震墙板模型,研究减震层厚度和宽度设计参数对框架抗震性能的影响。研究结果表明:BSF-ASDW1和BSF-ASDW2模型的模拟结果基本一致,说明拼装型自减震墙板的性能主要取决于叠层橡胶尺寸高度和宽度。墙板减震层宽度与其承载力呈现正相关关系,而墙板减震层的剪切应变与其承载力呈负相关关系。在水平力作用下,增加拼装型自减震墙板减震层宽度可提高框架的水平承载力,而增加减震层高度则会降低框架的水平承载力。(3)建立了BSF-ASDW1和BSF-ASDW2模型研究拼装型自减震墙板的平面外抗震性能。在平面外均布荷载作用下,拼装型自减震墙板可以通过钢板连接件形成条形墙板,并通过墙板之间的压应力传递荷载至T型连接件,计算结果较保守且安全。此外,通过建立12个不同参数的模型,研究发现增大减震层宽度可提高其竖向刚度,从而提高拼装型自减震墙板结构平面外抗震性能;不同板式叠层橡胶硬度对拼装型自减震墙板结构平面外承载力影响不显著,而减震层高度对其几乎无影响。

关键词：拼装型墙板自减震装配式钢框架抗震性能研究有限元分析

A Cross Entropy-Genetic Algorithm for m-Machines No-Wait Job-ShopScheduling Problem

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Journal of Intelligent Learning Systems and Applications 2011年第3期3卷 171-180页

作者： Budi santosa Muhammad Arif Budiman Stefanus Eko Wiratno 不详

No-wait job-shop scheduling (NWJSS) problem is one of the classical scheduling problems that exist on many kinds of industry with no-wait constraint, such as metal working, plastic, chemical, and food industries. Several methods have been proposed to solve this problem, both exact (i.e. integer programming) and metaheuristic methods. Cross entropy (CE), as a new metaheuristic, can be an alternative method to solve NWJSS problem. This method has been used in combinatorial optimization, as well as multi-external optimization and rare-event simulation. On these problems, CE implementation results an optimal value with less computational time in average. However, using original CE to solve large scale NWJSS requires high computational time. Considering this shortcoming, this paper proposed a hybrid of cross entropy with genetic algorithm (GA), called CEGA, on m-machines NWJSS. The results are compared with other metaheuritics: Genetic Algorithm-Simulated Annealing (GASA) and hybrid tabu search. The results showed that CEGA providing better or at least equal makespans in comparison with the other two methods.

关键词： No-Wait Job Shop Scheduling Cross Entropy Genetic Algorithm Combinatorial Optimization

Development of Broadband LHCP Pyramidal Horn Antenna with Septum Gaussian Profile Polarizer for CP-SAR Sensor Onboard Microsatellite

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Open Journal of Antennas and Propagation 2018年第4期6卷 73-83页

作者： Agus Hendra Wahyudi Cahya Edi santosa Josaphat Tetuko Sri Sumantyo Josaphat Microwave Remote Sensing Lab Chiba University Chiba Japan Indonesian National Institute of Aeronautics and Space (LAPAN) DKI Jakarta Indonesia

Horn Antenna has many applications such as communication, radar, and standard reference antenna for measurement. In this research, we designed a pyramidal horn for a Circularly Polarized Synthetic Aperture Radar (CP-SAR) sensor onboard a microsatellite. We utilized a 3D printer with Fused Deposition Modelling (FDM) technology for fast, low-cost, and low-weight production. Polylactide (PLA) material was used to construct 3D structures, and a copper conductive coating was painted on its surface. Gaussian distribution function was employed to create a septum polarizer profile. NPC-220 A with 1.6 thickness and 2.17 dielectric constant was used to make a microstrip monopole antenna and stripline feeding to feed the pyramidal horn to generate TE01 mode at one side of the waveguide. The design, parametric studies, and measurements are discussed in this paper. The designed antenna can achieve wide bandwidth 28% of 3 dB axial ratio, and more than 22% of s11 ≤ −10 dB in working frequency that is acceptable for CP-SAR requirement on the microsatellite.

关键词： CP-SAR Microsatellite Pyramidal Horn 3D Printer

Andy Grove回答你最头痛的职场人限问题

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全球商业经典 2008年第2期 70-73页

作者： ardy Grove

人际问题比工作更令人头痛。英特尔创办人Andy Grove以自己二十多年的经理人管理经验，以及充满个人智慧的独特见解，解决每个人都会遇到的职场难题。

关键词：职场头痛回答管理经验创办人英特尔经理人个人

Serum testosterone and prostate-specific antigen levels are major risk factors for prostatic volume increase among benign prostatic hyperplasia patients

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Asian Journal of Urology 2021年第3期8卷 289-297页

作者： Gede Wirya Kusuma Duarsa Yudit Anastasia Sari Anak Agung Gde Oka Kadek Budi santosa I Wayan Yudiana Pande Made Wisnu Tirtayasa Ida Bagus Putra Pramana Yudhistira Pradnyan Kloping Department of Urology Sanglah General HospitalFaculty of Medical and Health Sciences of Udayana UniversityDenpasarBaliIndonesia General Surgery Department Faculty of Medicine Udayana UniversityDenpasarBaliIndonesia Medical Faculty Universitas AirlanggaSurabayaEast JavaIndonesia

Objective:Benign prostatic hyperplasia(BPH)is one of the most common diseases found among elderly *** though multiple risk factors of BPH have been identified in the past,the risk factors which have a direct impact on prostate volume have not been *** this study,we aim to determine the most significant contributing risk factors to prostate volume enlargement by analyzing possible associated risk factors previously ***:This is a quantitative study with an analytical observational design,performed using a retrospective cohort *** sampling was performed on 83 patients who underwent transurethral resection of the prostate(TURP)in Sanglah General Hospital from January to February *** analysis is performed to examine each variable's association with prostate volume followed by a multivariate *** variables were reassessed with path analysis to measure the direct effects,indirect effects,and total effects on prostate ***:Bivariate analysis shows that serum testosterone(R=0.208;p=0.059)and prostate-specific antigen(PSA)level(R=0.626;p=0.001)have a significant association with prostate *** analysis shows that serum PSA(B=1.4;p=0.001;95%confidence interval[95%CI]=1.039-1.770)and testosterone(B=0.024;p=0.005;95%CI=0.008-0.041)levels are significant among all the analyzed risk *** is a significant and strong effect of PSA to prostate volume(c=0.636;p=0.001)whereas testosterone has a significant albeit weak effect to prostate volume(c=0.246;p=0.009)based on the total effect of the path ***:Serum testosterone and PSA levels are significantly associated with prostatic volume increase among BPH patients.

关键词： Testosterone Prostate-specific antigen Prostate volume Benign prostatic hyperplasia

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保留后瓣膜及瓣下结构二尖瓣置换术临床分析

保留后瓣膜及瓣下结构二尖瓣置换术临床分析

作者：柯锦贤（ardy Sanjaya Kosasih）广西医科大学

学位级别：硕士

目的：总结比较体外循环(CPB)心脏停跳下传统二尖瓣置换术和保留后瓣膜及其瓣膜下结构二尖瓣置换术的临床疗效,为探索较好的二尖瓣置换术术式提供理论依据。方法：回顾分析2014年1月1日至2014年12月31日于广西医学大学第一附属医院心胸... 详细信息

目的：总结比较体外循环(CPB)心脏停跳下传统二尖瓣置换术和保留后瓣膜及其瓣膜下结构二尖瓣置换术的临床疗效,为探索较好的二尖瓣置换术术式提供理论依据。方法：回顾分析2014年1月1日至2014年12月31日于广西医学大学第一附属医院心胸外科住院经胸骨中线切口体外循环心脏停跳下行二尖瓣膜单瓣膜置换术患者的临床资料共103例。其中实验组为保留二尖瓣后瓣膜及其膜下结构二尖瓣单瓣膜置换术患者47例;对照组为传统二尖瓣单瓣膜置换术患者56例。比较两组手术时间、心脏复跳时间、术后机械通气时间及CCU监护时间等手术指标;心胸比例和Tei指数、Z指数、左室舒张末期内径(LVEDD)、左室收缩末期内径(LVESD)、左心室射血分数(LVEF%)与右心室射血分数(RVEF%)等心脏功能指标差异。结果：本研究中,住院期间无患者死亡,所有患者均治愈或好转办理出院。(1)两组在手术时间、心脏复跳时间、术前心胸比例及术前各心脏功能指标无统计学差异(P>0.05);(2)实验组比对照组术后机械通气时间和CCU监护时间分别为(8.4±2.8)h比(9.7±2.4)h和(10.5±4.1)h比(12.7±4.8)h;(3)实验组及对照组术后3个月和6个月心胸比例分别为0.58±0.21比0.62±0.27和0.51±0.15比0.56±0.20;(4)实验组及对照组术后3个月和6个月Tei指数分别为0.82±0.24比0.99±0.34和0.61±0.16比0.7±0.32;Z指数分别为0.69±0.25比0.45±0.17和0.93±0.34比0.67+0.33;左室舒张末期内径(LVEDD)分别为52.6±6.4mm比56.1±6.9mm和51.1±6.8mm比54.9±7.2mm;左室收缩末期内径(LVESD)分别为41.8±6.9mm比44.7+7.5mm和40.3±-6.5mm比43.1+7.3mm;左心室射血分数(LVEF%)分别为62.3±6.2比56.6±5.7和65.5±7.0比58.3+6.3;右心室射血分数(RVEF%)分别为61.5±7.8比57.7±7.9和64.2±6.9比59.8+7.8。两组各观察指标均较术前有明显改善(P<0.05),而实验组术后各观察指标均明显优于对照组(P<0.05)。结论：二尖瓣膜置换术均可明显改善患者心脏功能,且较传统二尖瓣单瓣置换术而言,保留二尖瓣后瓣膜及其瓣膜下结构二尖瓣单瓣置换术更明显改善患者术后心功能,其临床疗效明显优于传统二尖瓣置换术,为目前我院推广的二尖瓣单瓣置换术手术方式。

关键词：心脏瓣膜疾病二尖瓣置换术保留后瓣及其膜下结构心脏功能

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老年及疾病人群对蛋白的特殊需求

老年及疾病人群对蛋白的特殊需求