On some analogues of lack of memory properties for the Gompertz distribution

We discuss some analogues of the lack of memory property, the strong lack of memory property and the almost lack of memory properties for the Gompertz distribution as applications of the integrated Cauchy functional equation.     

经济转型时期“用工荒”现象及其成因的经济学分析

文章从技能型劳动者的分类界定入手,对不同类型劳动者所面临的"用工荒"现象及其成因机制进行微观视角的分类研究。结果发现,当前的"用工荒"现象包含了多种类型的劳动者短缺,其中非技能型劳动者短缺的主要原因是被扭曲的收入分配比例和无保障的弹性用工模式导致新生代农民工供给激励不足,随着企业转型升级进程加快,此类"用工荒"现象将得到有效缓解;而造成技能型劳动者短缺的原因,既包括经济转型发展使对技能型劳动者的需求结构性增长,也有基于历史和现实原因的劳动者供给数量不足。技能型劳动者培育过程中的劳资双方行为"协调失灵"、政府职能缺位、社会化培训体系建设滞后和劳动力市场的无序发展等因素都是导致技能型劳动者增长速度滞后于经济转型发展要求、进而导致技能型劳动者"用工荒"现象的主要原因。     

Rejoinder to 'Ahmed, M.S. (1998). A note on regression-type estimators using multiple auxiliary information.'

In the estimators t ₃ , t ₄ , t ₅ of Mukerjee, Rao & Vijayan (1987), b _{y x} and b _{y z} are partial regression coefficients of y on x and z , respectively, based on the smaller sample. With the above interpretation of b _{y x} and b _{y z} in t ₃ , t ₄ , t ₅ , all the calculations in Mukerjee at al. (1987) are correct. In this connection, we also wish to make it explicit that b _{x z} in t ₅ is an ordinary and not a partial regression coefficient. The 'corrected' MSEs of t ₃ , t ₄ , t ₅ , as given in Ahmed (1998 Section 3) are computed assuming that our b _{y x} and b _{y z} are ordinary and not partial regression coefficients. Indeed, we had no intention of giving estimators using the corresponding ordinary regression coefficients which would lead to estimators inferior to those given by Kiregyera (1984). We accept responsibility for any notational confusion created by us and express regret to readers who have been confused by our notation. Finally, in consideration of the above, it may be noted that Tripathi & Ahmed's (1995) estimator t ₀ , quoted also in Ahmed (1998), is no better than t ₅ of Mukerjee at al. (1987).     

A note on the strategic aspects of the transfer paradox

It is well known that an agent can be hurt by accepting a gift, the donor of which is made better off. Why then does the recipient accept this welfare reducing gift? This paper examines the strategic aspects of the paradox. It shows that if the recipient refuses the gift, it would suffer an even greater loss of welfare since there is a mutually advantageous reallocation between the donor and a third agent. It is shown that the recipient does have a viable alternative strategy: it could destroy some of its endowment, raising its welfare level and reducing that of the potential donor.     

Managerial value and belief systems in a cross-national context: The case of thetrivial significance

This article discusses potential theoretical and methodological flaws in value-based research in a cross-national context. Using data from a comparative study of American and Indian CEOs, it is shown that some managerial beliefs and value systems do vary as a function of national background. While this is neither surprising nor exciting, whether this significantheterogeneity offers nontrivial predictive utilityin explaining the observed variance in a large number of structural, strategic, and other critical variables at the organizational level is the more important question. This study offers preliminary evidence to the contrary.In this era of multinational corporations and an emerging global market for executive and managerial talent, the question of whether some managerial beliefs and value systems persist in spite of extensive acculturation and socialization has been an issue of concern — especially in the United States because of a large and continuing flow of immigrants. Our results show in essence that this question, though important and interesting from a sociological angle, is perhaps not as crucial as one might suppose in influencing the strategic thrust, structural configurations, or certain aspects of performance of an organization.     

泰乐松注射液的毒理学试验研究

为提供泰乐松注射液的安全性毒理学评价资料,本试验采用改进Karber法测定小鼠LD_(50);以剂量递增法测定小鼠蓄积性和耐受性;分别以剂量340、130、30mg／kg为3个试验组．设阴性和阳性对照组进行小鼠骨髓微核试验;分别以剂量500、250、120mg／kg为3个剂量组．设阴性和阳性对照组进行小鼠精于畸形试验。结果表明：其LD_(50)为669．80mg／kg,蓄积系数大于5．3,无明显蓄积毒性和耐受性（P＞0．05）,小鼠骨髓微核试验和精子畸形试验结果均为阴性。     

促性腺激素、V_(D_3)、V_E亚硒酸钠对母兔繁殖力的影响

选择成年、健康、未孕母兔 32只 ,随机分成 8组 ,分别给予促性腺激素 (Ⅰ组 )、VD3(Ⅱ组 )、VE 亚硒酸钠 (Ⅲ组 ) ,促性腺激素 +VD3(Ⅳ组 )、VD3+VE 亚硒酸钠 (Ⅴ组 )、促性腺激素 +VE 亚硒酸钠(Ⅵ组 )、促性腺激 +VD3+VE 亚硒酸钠 (Ⅶ组 ) ,空白对照 8种处理。试验结果表明 ,母兔经药物处理后 ,其繁殖性能 (发情状况、排卵数、正常受精卵数 )都比对照组显著地提高 ,但Ⅰ、Ⅳ、Ⅵ组有畸形卵子存在 ,以处理Ⅶ组效果最好 ,其排卵数达 4 7± 2 0 .3个 ,正常受精卵 35个 ,分别比对照组多 36 .5个、30个。     

基于Simulink的模糊PID参数自整定控制器的设计与仿真

针对PID控制器参数整定问题,介绍了一种运用模糊推理实现对PID参数自整定的控制方法,并运用S imu link进行仿真分析,仿真结果表明:模糊PID参数自整定控制较常规PID控制具有较小的超调量和较短的调节时间,以及较好的动态响应特性和稳态特性。