一种个体软件过程能力度量方法

个体软件过程(PSP)是由卡内基×梅隆大学软件工程研究所的Humphrey领导开发的.它是一种可用于控制、管理和改进个人工作方式的自我持续改进过程.随着工业界对软件过程改进需求的日益增长,PSP成为了软件组织为达成完全(从宏观到微观)量化过程管理研究中的一个热点课题.软件过程研究表明,高水平的个体软件过程能力是软件项目成功的关键,如何进行有效的个体软件过程能力度量是PSP中的一个核心问题.现有方法不能同时有效处理个体软件过程能力度量中的可变规模收益、多变量输入/输出以及决策者偏好问题.提出了一种综合了数据包络分析(DEA)和层次分析法(AHP)的个体软件过程能力评价方法--PSPADA,介绍了PSPADA的个体软件过程能力评价模型和核心算法(集成决策者偏好和估计规模收益).实验结果显示,PSPADA能够在考虑决策者偏好的同时,有效地进行多指标、规模收益可变的量化评估.

GPS/VRS positioning using atmospheric modeling

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Geração de VRS a partir de modelos atmosféricos: Conceito, implementação e resultados

Nowadays, with the implantation of GNSS (Global Navigation Satellite System) reference station networks, several positioning techniques have been developed and/or improved. Using such kind of network data it is possible to model the GNSS distance dependent errors and to compute correction terms for the network region. Several methods have been developed to formulate the corrections terms from network stations data. A method that has been received a great attention is the Virtual Reference Station (VRS). The idea is that the VRS data resemble as much as possible a real receiver data placed in the same local. Therefore, the user has the possibility of using the VRS as if it were a real reference station in your proximities, and to accomplish the relative positioning with a single frequency receiver. In this paper it is described a different methodology applied to implement the VRS concept, using atmospheric models developed by Brazilian researchers. Besides, experiments for evaluating the quality of generated VRS are presented, showing the efficiency of the proposed method.

Generating VRS data using atmospheric models: How far can we go?

Nowadays, with the expansion of the reference stations networks, several positioning techniques have been developed and/or improved. Among them, the VRS (Virtual Reference Station) concept has been very used. In this paper the goal is to generate VRS data in a modified technique. In the proposed methodology the DD (double difference) ambiguities are not computed. The network correction terms are obtained using only atmospheric (ionospheric and tropospheric) models. In order to carry out the experiments it was used data of five reference stations from the GPS Active Network of West of São Paulo State and an extra station. To evaluate the VRS data quality it was used three different strategies: PPP (Precise Point Positioning) and Relative Positioning in static and kinematic modes, and DGPS (Differential GPS). Furthermore, the VRS data were generated in the position of a real reference station. The results provided by the VRS data agree quite well with those of the real file data.

VRS: vital registration software package; information and operating manual

Manual que entrega instrucciones para el uso del programa computacional diseñado para el procesamiento ágil de las estadísticas vitales, escrito en Clipper y operado en microcomputador. Permite el ingreso relativamente simple de los datos y la posibilidad de obtener tabulaciones. Contiene tres secciones: a) entrada de datos; b) generación de tablas; c) apéndices. Entre éstos hay uno que incluye una lista de las variables para nacimientos y muertes.

Análise de modelos troposféricos no posicionamento baseado em redes usando o conceito de VRS

In the past few years several GPS (Global Position System) positioning techniques have been develope and/or improved with the goal of obtaining high accuracy and productivity in real time. The reference station network concept besides to enabling quality and reliability in positioning for scientific and civil GPS community, allows studies concerning tropospheric refraction modeling in the network region. Moreover, among the network corrections transmission methods available to users, there is the VRS (Virtual Reference Station) concept. In this method, the data of a virtual station are generated near the rover receiver (user). This provides a short baseline and the user has the possibility of using a single frequency receiver to accomplish the relative positioning. In this paper, the methodology applied to generate VRS data, using different tropospheric models is described. Thus, comparative tests were conducted in the four seasons with the NWP/INPE (Numerical Weather Prediction/National Institute for Space Research) and Hopfield tropospheric models. In order to analyse the VRS data quality, it was used the Precise Point Positioning (PPP) method, where satisfactory results were found. Mean differences between PNT/INPE and Hopfield models of 9.75% and 24.2% for the hydrostatic and wet days, respectively were obtained.

Web Service para geração de VRS no contexto de posicionamento GPS

Internet is fully inserted in contemporary society, specially in relation to entertainment services and trading. Its reach has transposed the traditional desktop computer models coming to mobile devices like cell phones and GPS receivers. Likewise, the scientific community takes its benefits, both for publication of studies and for communication between clusters processing information, such as at LHC, located in Switzerland. Concerning geodetic positioning, researches in the area present the concept of Virtual Reference Stations - VRS, in which is necessary a communication way between the real reference stations and a central system as well as between central system and a service requester. In this work, we analyze the current solutions for generation of VRS with regard to data delivery for the service requester and present a solution based on Web Services as an alternative to the model being developed by Spatial Geodesy Study Group – GEGE/FCT/UNESP. Comparing solutions, it was verified the potential of Web Services to aid in researches of geodetic positioning using VRS. Using such technology, it is obtained interoperability, providing greater flexibility to develop client applications, both development carried out by researchers of the university or by any person or enterprise wishing to use the service

Modelos vrs. Modelos . Acercamiento inicial a la cuestión tecnológica en algunos manuales sobre caficultura, 1774-1895

ResumenEn este trabajo se ofrece una comparación inicial de los modelos tecnológicos explícitos e implícitos propuestos o supuestos por los autores de una serie de tratados generales, manuales y estudios sobre caficultura, tanto europeos o estadounidenses como caribeños y latinoamericanos. También se contrastan las recomendaciones técnicas como las diversas prácticas de cultivo y procesamiento que se traslucen a través de las páginas de dichos textos.AbstractThe study offers an initial comparison of the explicit and implicit technological models suggested or assumed by the author of a series of general treatises, manuals and studies on coffee, both by Europeans or North Americans and by Caribbeans or Latin Americans. Technical recommendations are also contrasted with the various agricultural and processing systems actually in use, as reflected in the pages of those same texts.

Assessment of commercial network RTK user positioning performance over long inter-station distances

The paper provides an assessment of the performance of commercial Real Time Kinematic (RTK) systems over longer than recommended inter-station distances. The experiments were set up to test and analyse solutions from the i-MAX, MAX and VRS systems being operated with three triangle shaped network cells, each having an average inter-station distance of 69km, 118km and 166km. The performance characteristics appraised included initialization success rate, initialization time, RTK position accuracy and availability, ambiguity resolution risk and RTK integrity risk in order to provide a wider perspective of the performance of the testing systems. ----- ----- The results showed that the performances of all network RTK solutions assessed were affected by the increase in the inter-station distances to similar degrees. The MAX solution achieved the highest initialization success rate of 96.6% on average, albeit with a longer initialisation time. Two VRS approaches achieved lower initialization success rate of 80% over the large triangle. In terms of RTK positioning accuracy after successful initialisation, the results indicated a good agreement between the actual error growth in both horizontal and vertical components and the accuracy specified in the RMS and part per million (ppm) values by the manufacturers. ----- ----- Additionally, the VRS approaches performed better than the MAX and i-MAX when being tested under the standard triangle network with a mean inter-station distance of 69km. However as the inter-station distance increases, the network RTK software may fail to generate VRS correction and then may turn to operate in the nearest single-base RTK (or RAW) mode. The position uncertainty reached beyond 2 meters occasionally, showing that the RTK rover software was using an incorrect ambiguity fixed solution to estimate the rover position rather than automatically dropping back to using an ambiguity float solution. Results identified that the risk of incorrectly resolving ambiguities reached 18%, 20%, 13% and 25% for i-MAX, MAX, Leica VRS and Trimble VRS respectively when operating over the large triangle network. Additionally, the Coordinate Quality indicator values given by the Leica GX1230 GG rover receiver tended to be over-optimistic and not functioning well with the identification of incorrectly fixed integer ambiguity solutions. In summary, this independent assessment has identified some problems and failures that can occur in all of the systems tested, especially when being pushed beyond the recommended limits. While such failures are expected, they can offer useful insights into where users should be wary and how manufacturers might improve their products. The results also demonstrate that integrity monitoring of RTK solutions is indeed necessary for precision applications, thus deserving serious attention from researchers and system providers.

Optimal voltage support mechanism in distribution networks

Optimal scheduling of voltage regulators (VRs), fixed and switched capacitors and voltage on customer side of transformer (VCT) along with the optimal allocaton of VRs and capacitors are performed using a hybrid optimisation method based on discrete particle swarm optimisation and genetic algorithm. Direct optimisation of the tap position is not appropriate since in general the high voltage (HV) side voltage is not known. Therefore, the tap setting can be determined give the optimal VCT once the HV side voltage is known. The objective function is composed of the distribution line loss cost, the peak power loss cost and capacitors' and VRs' capital, operation and maintenance costs. The constraints are limits on bus voltage and feeder current along with VR taps. The bus voltage should be maintained within the standard level and the feeder current should not exceed the feeder-rated current. The taps are to adjust the output voltage of VRs between 90 and 110% of their input voltages. For validation of the proposed method, the 18-bus IEEE system is used. The results are compared with prior publications to illustrate the benefit of the employed technique. The results also show that the lowest cost planning for voltage profile will be achieved if a combination of capacitors, VRs and VCTs is considered.

Planning of distribution networks for medium voltage and low voltage

Determination of the placement and rating of transformers and feeders are the main objective of the basic distribution network planning. The bus voltage and the feeder current are two constraints which should be maintained within their standard range. The distribution network planning is hardened when the planning area is located far from the sources of power generation and the infrastructure. This is mainly as a consequence of the voltage drop, line loss and system reliability. Long distance to supply loads causes a significant amount of voltage drop across the distribution lines. Capacitors and Voltage Regulators (VRs) can be installed to decrease the voltage drop. This long distance also increases the probability of occurrence of a failure. This high probability leads the network reliability to be low. Cross-Connections (CC) and Distributed Generators (DGs) are devices which can be employed for improving system reliability. Another main factor which should be considered in planning of distribution networks (in both rural and urban areas) is load growth. For supporting this factor, transformers and feeders are conventionally upgraded which applies a large cost. Installation of DGs and capacitors in a distribution network can alleviate this issue while the other benefits are gained. In this research, a comprehensive planning is presented for the distribution networks. Since the distribution network is composed of low and medium voltage networks, both are included in this procedure. However, the main focus of this research is on the medium voltage network planning. The main objective is to minimize the investment cost, the line loss, and the reliability indices for a study timeframe and to support load growth. The investment cost is related to the distribution network elements such as the transformers, feeders, capacitors, VRs, CCs, and DGs. The voltage drop and the feeder current as the constraints are maintained within their standard range. In addition to minimizing the reliability and line loss costs, the planned network should support a continual growth of loads, which is an essential concern in planning distribution networks. In this thesis, a novel segmentation-based strategy is proposed for including this factor. Using this strategy, the computation time is significantly reduced compared with the exhaustive search method as the accuracy is still acceptable. In addition to being applicable for considering the load growth, this strategy is appropriate for inclusion of practical load characteristic (dynamic), as demonstrated in this thesis. The allocation and sizing problem has a discrete nature with several local minima. This highlights the importance of selecting a proper optimization method. Modified discrete particle swarm optimization as a heuristic method is introduced in this research to solve this complex planning problem. Discrete nonlinear programming and genetic algorithm as an analytical and a heuristic method respectively are also applied to this problem to evaluate the proposed optimization method.

Operating efficiency and return to scale of Malaysian REITS: The preliminary findings

This paper aims to present preliminary findings on measuring the technical efficiencies using Data Envelopment Analysis (DEA) in Malaysian Real Estate Investment Trusts (REITs) to determine the best practice for operations which include the asset allocation and scale size to improve the performance of Malaysian REITs. Variables identified as input and output will be assessed in this cross section analysis using the operational approach and Variable Return to Scale DEA (VRS-DEA) by focusing on Malaysian REITs for the year 2013. Islamic REITs have higher efficiency score as compared to the conventional REITs for both models. Diversified REITs are more efficient as compared to the specialised REIT using both models. For Model 1, the negative inefficient value is identified in the managerial inefficiency as compared to the scale inefficiency. This shows that inputs are not fully minimised to produce more outputs. However, when other expenses are considered as different input variables, the efficiency score becomes higher from 60.3% to 81.2%. In model 2, scale inefficiency produce greater inefficiency as compared to the managerial efficiency. The result suggests that Malaysian REITs have been operating at the wrong scale of operations as majority of the Malaysian REITs are operating at decreasing return to scale.

Valkoinen läiskä kartalla : Perusvärinnimet ja niiden merkityskentät unkarin- ja suomenkielisissä idiomeissa

Työni tavoitteena on vertailla unkarilaisia ja suomalaisia idiomeja, joissa esiintyy jokin perusvärinnimi. Perusvärinnimiä ovat fehér (valkoinen), fekete (musta), szürke (harmaa), piros tai vörös (punainen), zöld (vihreä), sárga (keltainen), kék (sininen) ja barna (ruskea). Erityisesti pyrin ottamaan selvää käytetäänkö samaa värinnimeä molemmissa kielissä samasta asiasta vai onko värinnimien käytössä tarkasteltujen kielten välillä eroja. Vertailen unkarilaisia idiomeja suomalaisiin ja käytän vertailussa Tamás Forgácsin esittämää mallia ekvivalenssin lajeista. Aineisto on kerätty unkarin- ja suomenkielisistä fraasi- ja idiomisanakirjoista sekä yleissanakirjoista. Idiomi on yksi fraseologismien alaryhmistä. Idiomi koostuu vähintään kahdesta lekseemistä, jotka voidaan kirjoittaa joko yhteen tai erikseen. Idiomi on puhtaimmillaan opaakki, kiteytynyt sanaliitto, mutta idiomi voi olla myös osittain sananmukaisesti tulkittavissa. Idiomaattisuuden ja metaforisuuden aste on jatkumo, jonka toisessa päässä ovat täysin läpinäkymättömät ja toisessa transparentit sanaliitot. Idiomit ovat puhtaimmillaan tiettyyn kieleen sidottuja. Idiomit voivat olla kuitenkin laajalevikkisiä, koska niitä on lainattu eri kieliin suoraan kääntämällä esimerkiksi Raamatusta tai antiikin teksteistä. Viime vuosisatojen ja vuosikymmenten idiomit ovat hypoteettisesti useimmiten käännöslainoja jostain Euroopan valtakielestä. Värinnimitutkimuksen tunnetuimpia teorioita on Berlinin ja Kayn teoria kielessä esiintyvien värinnimien järjestyksestä. Heidän mukaansa musta, valkoinen ja punainen esiintyvät maailman kielissä kaikista yleisimmin, sininen, ruskea ja harmaa puolestaan esiintyvät vain korkeakulttuureissa, eivät esimerkiksi luonnonkansojen kielissä. Hypoteesini on, että aineistossa esiintyvien värinnimien lukumäärä korreloi jossain määrin Berlinin ja Kayn esittämän värinnimien järjestyksen kanssa. Täysin identtisiä idiomeja sanastoltaan ja merkitykseltään löytyy aineistosta suhteellisen paljon, useimmat näistä ovat valkoisen, mustan tai harmaan värin sisältäviä idiomeja. Täysin toisiaan vastaavista idiomeista suurin osa on tullut unkariin ja suomeen Raamatusta tai lainattu sellaisenaan englannista, saksasta tai ranskasta. Osittaisessa vastaavuussuhteessa ja funktionaalisessa vastaavuussuhteessa löytyy värinnimien kannalta mielenkiintoisimmat idiomit: keltainen ja vihreä esiintyvät parissa idiomissa ristikkäin. Pääasiassa idiomeissa esiintyvät värinnimet ovat unkarin ja suomen välillä identtisiä, mikäli unkarilaiselle idiomille löytyy vastine suomen kielestä. Idiomit ilman vastinetta ovat aineiston suurin ja samalla myös kirjavin ryhmä analysoitavaksi, pienin ryhmä puolestaan ovat leksikaalisen vastaavuuden ryhmään kuuluvat idiomit. Suurin osa unkarilaisista idiomeista on työssä analysoitu, mutta suomenkieliset vastineettomat idiomit jäävät vähäiselle huomiolle tutkimusongelman näkökulmasta johtuen. Aineiston 143 unkarilaisesta idiomista noin puolet sijoittuu nollaekvivalenssin eli vastineettomien idiomien ryhmään. Täydellisen ekvivalenssin ryhmä on toiseksi suurin, leksikaalisen vastaavuuden ryhmä pienin. Idiomeissa esiintyvistä väreistä yleisimpiä ovat musta, valkoinen, punainen ja vihreä. Ruskeaa väriä ei esiinny unkarilaisissa idiomeissa lainkaan, suomalaisissa idiomeissa viidessä. Unkarin ja suomen värien merkityskentät vastaavat pitkälti toisiaan. Ainoastaan keltainen ja vihreä esiintyivät selkeästi ristikkäin: unkariksi kateus on keltaista ja suomeksi vihreää, tulokkaaseen liitetään unkarissa vihreä, suomessa keltainen väri.