Separate but equal? A comparison of participants and data gathered via Amazon’s MTurk,social media,and face-to-face behavioral testing

Recent and emerging technology permits psychologists today to recruit and test participants in more ways than ever before. But to what extent can behavioral scientists trust these varied methods to yield reasonably equivalent results? Here, we took a behavioral, face-to-face task and converted it to an online test. We compared the online responses of participants recruited via Amazon’s Mechanical Turk (MTurk) and via social media postings on Twitter, Facebook, and Reddit. We also recruited a standard sample of students on a college campus and tested them in person, not via computer interface. The demographics of the three samples differed, with MTurk participants being significantly more socio-economically and ethnically diverse, yet the test results across the three samples were almost indistinguishable. We conclude that for some behavioral tests, online recruitment and testing can be a valid—and sometimes even superior—partner to in-person data collection.     

大学生简历推广系统设计

分析当前的网络招聘环境及现有网络招聘网站的运作模式．设计了一个推广方式与现存的招聘网站优劣互补的大学生简历管理与推广系统,为现有的网络招聘网站提供补充。     

数字签名技术在高考招生中的应用

随着互联网应用的普及,全国许多省市在普通高校招生中实行了网上填报志愿和补报志愿,但这种新方式的安全性不断受到人们的质疑.由此可见,在网上填报志愿中引入可靠的电子签名机制以保证信息的保密性、完整性以及不可抵赖性已经是迫在眉睫.     

我国药物I期临床试验受试者招募及管理存在的问题

受试者招募是影响I期临床试验质量的一个重要环节。本文针对我国I期临床试验受试者招募与管理存在的问题,探讨相应的对策,以期保护受试者的权益和安全,提高我国药物I期临床试验的水平和质量。     

Predation by alewife on lake trout fry emerging from laboratory reefs: Estimation of fry survival and assessment of predation potential

Alewife (Alosa pseudoharengus) predation may be an important mortality source on lake trout fry (Salvelinus namaycush), and could affect the success of lake trout restoration in the Great Lakes. This study tested the prediction that fry showing typical swimming and avoidance behavior over artificial reefs will differ in survival when alewives are present versus when alewives are absent. Six tanks with cobble substrate were each stocked with 153 lake trout fry (density = 131 m^− 2), a density comparable to that recorded at Stony Island reef, Lake Ontario during the early 1990s. Four treatment tanks each contained ten alewives (density = 8 m^− 2) and two control tanks contained no alewives. After 12 days, mean recovery of fry was less in treatment tanks (31.5 fry per tank) than in control tanks (150 fry per tank; P < 0.009). Fry mortality in control tanks was about 2% in contrast to 46 to 91% mortality in tanks containing alewives. Alewife predation effects were evident early in the experiment as the mean daily capture of fry by traps set in each tank was always lower after day two in treatment tanks than in control tanks. The rate of consumption of lake trout fry by alewives ranged from 0.57 to 1.16 fry alewife^− 1 day^− 1 (mean = 0.99 ± 0.141; median = 1.12). The results of this study support the hypothesis that predation by alewives could cause a high level of lake trout fry mortality, and thus affect natural recruitment of lake trout and the success of population rehabilitation.     

Predation on emergent lake trout fry in Lake Champlain

The rehabilitation of extirpated lake trout (Salvelinus namaycush) in the Great Lakes and Lake Champlain has been hindered by various biological and physiological impediments. Efforts to restore a lake trout fishery to Lake Champlain include hatchery stocking and sea lamprey control. Despite these management actions, there is little evidence of recruitment of naturally-produced fish in annual fall assessments. Spawning occurs at multiple sites lake-wide in Lake Champlain, with extremely high egg and fry densities, yet sampling for juvenile lake trout has only yielded fin-clipped fish. To investigate this recruitment bottleneck, we assessed predation pressure by epi-benthic fish on emergent fry on two spawning reefs and the subsequent survival and dispersal of fry in potential nursery areas. Epi-benthic predators were sampled with 2-h gillnet sets at two small, shallow sites in Lake Champlain throughout the 24-h cycle, with an emphasis on dusk and dawn hours. In total, we documented seven different species that had consumed fry, with consumption rates from 1 to 17 fry per stomach. Rock bass and yellow perch dominated the near-shore fish community and were the most common fry predators. Predator presence and consumption of fry was highest between 19:00 and 07:00. Predators only consumed fry when fry relative abundance was above a threshold of 1 fry trap^− 1 day^− 1. We used an otter trawl to sample for post-emergent fry adjacent to the reef, but did not capture any age-0 lake trout. Due to the observed predation pressure by multiple littoral, species on shallow spawning reefs, lake trout restoration may be more successful at deep, offshore sites.     

Spatial and seasonal comparisons of growth of wild and stocked juvenile lake trout in Lake Champlain

After 42 years of stocking in Lake Champlain, recruitment of wild juvenile lake trout (Salvelinus namaycush) was first observed in 2015. Abundance of wild lake trout juveniles was spatially heterogeneous. Recruitment of wild fish to age-1 and subsequent survival are likely related to growth including overwinter growth. We hypothesized that growth potential or growth-related mortality of wild and stocked fish may explain spatial differences in abundance. We collected juvenile (age-0 to 3) lake trout by bottom trawling in the central, north, and south Main Lake every 2–4 weeks during the ice-free season, 2015–2018. The percentage of wild juveniles increased from 27.8% of the total catch in 2015 to 65.7% in 2018. Rates of growth in length and change in condition were compared in wild versus stocked lake trout, among sampling areas, and between seasons (sampling season relative to winter). Wild juveniles grew equally or faster in length than stocked juveniles at the same age, but changed more slowly in condition. There was a higher percentage of wild juveniles in the central sampling area than the north and south, but no differences in growth among sampling areas. Wild and stocked fish grew in length over winter, but most cohorts (6 of 7) maintained or increased condition. Results indicate high growth potential of wild juvenile lake trout and progress toward population restoration.     

Recruitment and selection processes through an effective GDSS

This study proposes a group decision support system (GDSS), with multiple criteria to assist in recruitment and selection (R&S) processes of human resources. A two-phase decision-making procedure is first suggested; various techniques involving multiple criteria and group participation are then defined corresponding to each step in the procedure. A wide scope of personnel characteristics is evaluated, and the concept of consensus is enhanced. The procedure recommended herein is expected to be more effective than traditional approaches. In addition, the procedure is implemented on a network-based PC system with web interfaces to support the R&S activities. In the final stage, key personnel at a human resources department of a chemical company in southern Taiwan authenticated the feasibility of the illustrated example.     

高职院校数字迎新工作数据流程设计

高职院校由于办学历史不长,不仅录取通过普通高考招收的普招生,同时也要考虑拟招收自考成教类学生,有些学校还保留中专类学生,新生数据复杂。同时,迎新工作集中在几天进行,迎新现场工作压力大。通过数字化方式实施新生报到的迎新工作,不仅能解决迎新中的各种复杂问题,也能为后续的应用系统提供有效数据。本文拟通过整理迎新工作数据流程,实现高职数字化迎新,缓解迎新工作压力。