Grid Information Service (GIS) is responsible for information discovery, registration, query and update in grid environment and it provides actual,real-time and dynamic information of grid resources and services.
网格信息服务(Grid Information Service,GIS)主要完成对网格计算环境中信息的发现、注册、查询和修改等工作,提供对网格环境中各种硬件资源和服务的一个真实、实时的动态反映。
This paper introduces the popular technology of Distributed Computing on J2EE-Java Message Service(JMS),includes Application architecture,Communications model and Message transmission's mechanism.
Compared with the first come first service (FCFS), short request first (SRF), and dynamic earliest deadline first (DEDF), the simulation results of the DPSP show that it can enhance the WWW QoS by increasing only little response time.
与先来先服务 FCFS(first come first service)、短请求优先 SRF (short request first)和 DEDF(dynamic earliest deadline first)策略进行模拟比较表明 :DPSP策略以较小的响应延迟增量为代价 ,提高了 WWW的服务质量
Grid Information Service (GIS) is responsible for information discovery, registration, query and update in grid environment and it provides actual,real-time and dynamic information of grid resources and services.
网格信息服务(Grid Information Service,GIS)主要完成对网格计算环境中信息的发现、注册、查询和修改等工作,提供对网格环境中各种硬件资源和服务的一个真实、实时的动态反映。
The VCO employs reflective structure,and is optimized at frequency band of local multipoint distribution service(LMDS) in China. The chip was fabricated with OMMIC ED02AH process. Its the size is 1.2mm×0.8mm.
该压控振荡器采用反射式结构,并针对了我国本地多点分配业务(LMDS)频段进行了优化设计,芯片采用OMM IC ED02AH工艺实现,芯片的尺寸为1.2mm×0.8mm.
This paper introduces a new scheme of remote automatic meter reading device based on embedded Linux operating system,which adopts high-performance 32-bit CPU(MPC860T),advanced radio communication modules and uses general packet radio service (GPRS)as data transmission platform,thus realizing efficient kWh meter reading and seamless data fusion with Internet and improving the technical level of kWh meter reading.
PWE3(Pseudo-WireEmulation Edge-to-Edge) is a mechanism that emulates the essential attributes of a telecommunications service (such as ATM or FR) over a PSN.
Also, through theresearch on the application of streaming media system to CDMA1X network, itproposes the optimized solution of the Quality of Service (QoS).
通过分析移动流媒体在 CDMA1X 网络上的应用,提出网络服务质量(Quality of Service,QoS)的优化方案。
In this paper exhaustive-service priority-M/G/1 queueing systems with multiple vacations, single vacation and setup times are studied under the nonpreemptive and preemptive resume priority disciplines.
Finally, another physical meaning of the service rate is given.
An M/G/1 retrial queue with second multi-optional service, feedback and unreliable server
An M/G/1 retrial queue with two-phase service and feedback is studied in this paper, where the server is subject to starting failures and breakdowns during service.
Primary customers get in the system according to a Poisson process, and they will receive service immediately if the server is available upon arrival.
As in general in all time service works, the problem is to obtain and keep an accurate time, to determine the corrections of standard clock and to transmit time signals. This present report is concerned only with the last two items. At Zi-Ka-Wei Observatory, radio method was introduced into time service in 1914. Some rigorous changes occured in 1926, a number of instruments were installed. Many of them are still in use. In 1940, the observatory began to transmit rhythmic signals twice a day. From...
As in general in all time service works, the problem is to obtain and keep an accurate time, to determine the corrections of standard clock and to transmit time signals. This present report is concerned only with the last two items. At Zi-Ka-Wei Observatory, radio method was introduced into time service in 1914. Some rigorous changes occured in 1926, a number of instruments were installed. Many of them are still in use. In 1940, the observatory began to transmit rhythmic signals twice a day. From then on until December 1950, no further developments were made. The main instruments we had in 1950 were: a 80mm Prin transit with impersonal micrometer, two Leroy pendulums as standard clocks, three astronomical clocks and their slaves, equipments for receiving and recording time signals, etc. Since 1952, we began to make some improvements, especially on rhythmic signals. First, we converted a common clock into a "transmitting clock" to obtain 61 impulses in every minute and second by making use of photoelectric arrangement (Fig. 1), we succeeded to raise the accuracy of our signals. To improve signal accuracy further, we have to deal with various sources of errors which are conditioned by our equipments. The most important among these are: 1. error in prediction of corrections of the standard clocks, 2. error in the adjustment of the transmitting clock and 3. time lag in transmission. In consequence of last three-year's research, these errors are reasonably reduced. The first two are now±0~s.007 and ±0~s.005 respectively and the last is small. Accordingly, the deviation of time signals XSG has been supposed to be±0~s.01. However, this is not enough for the requirement. The more efforts are being made to bring further improvements. But as the requirements for signal accuracy is far above what the present installation can offer, some new equipments are ordered and they will joint in force with the old ones in the nearest future. Since February 1954, Zi-Ka-Wei Observatory has cooperated with the time service departments in Soviet Union. This has been helpful to our works in every way.
Results of planting large amount of slightly but evidently diseased tubers undernatural field conditions obtained by inoculation during the harvesting time of theprevious year indicate that successive underground secondary infections from plantto plant of the same hill constitute the main feature of the process of formation ofprimary foci of subsequent aerial spread of the late blight in a potato plantation Inspection at the time of emergence revealed that all the sprouts found at theperiphery of and directly...
Results of planting large amount of slightly but evidently diseased tubers undernatural field conditions obtained by inoculation during the harvesting time of theprevious year indicate that successive underground secondary infections from plantto plant of the same hill constitute the main feature of the process of formation ofprimary foci of subsequent aerial spread of the late blight in a potato plantation Inspection at the time of emergence revealed that all the sprouts found at theperiphery of and directly connected with the tuber lesions were blackened and diedunderground.Among the sprouts which were about to emerge,those standing closeto the dead sprouts were also discolored at their basal portion,while those furtherapart still entirely healthy.Dark brown extended lesions can sometimes be seen onthe stems of the weak potato seedlings,but sporangial covering was present onlyon their lower underground portions.The stem lesions did not always reach theextremity of the stem base.Even if they did,they might not be directly connectedwith the tuber lesions. Among a total of 789 hills planted with disesed tubers in Peking and Salintzein 1956,only 9 plants with stem lesions were found,of which 5 wilted and diedrapidly,1 with its lesion healed up.The remainder stayed long enough for thefungus to sporulate on their above-ground portion of the lesions and cause thefoliage infection of the same plant and adjacent plants at the onset of a favorable weather. It is believed that the significance of the weak diseased seedlings with basalstem lesions appeared early in the season consists chiefly in the capacity of givingrise to sporangia which may again infect the underground portion of the stem of ahither to healthy plant.On the stem of a larger plant,the fungous mycelium canonly exist in the cortical tissue spreading upward and downward from the infectioncourt to cause a dark brown stripe of irregular width.Stripe lesions of this typeapparently do nto impair the normal development of the plant,but their above-ground portions serve as a persistent potential source of aerial infection. Observations outlined above together with the results of an experiment ofseedling top inoculations under field conditions lead us to postutate that delayedaerial infection is due on the one hand to the fragility of the diseased seedlingsunder natural field conditions and on the other to the lack of a suitable combinationof moisture and temperature required for sporulation and infection as the springweather is characterized by very low night temperature. It is anticipated that local forcasting service may find it helpful to plant diseasedtubers in a proper field plot for the observation on the development.of the foci ofpotato late blight.
Among a total of 20,067 pregnant women ad- mitted to the Lying-In Hospital of the Shanghai First Medical School in the three-year period from January 1953 to December 1955,there were 342 cases of heart disease,giving an incidence of 1.7%.The etiological types of heart disease were,in their order of frequency,as follows:rheumatic heart disease 65.2%,heart failure due to toxemia of pregnancy 14.3%,congenital anomalies of heart 9.3%,anemia heart disease 5.3%,hypertensive heart disease 2.7%,and others 3.2%. Only...
Among a total of 20,067 pregnant women ad- mitted to the Lying-In Hospital of the Shanghai First Medical School in the three-year period from January 1953 to December 1955,there were 342 cases of heart disease,giving an incidence of 1.7%.The etiological types of heart disease were,in their order of frequency,as follows:rheumatic heart disease 65.2%,heart failure due to toxemia of pregnancy 14.3%,congenital anomalies of heart 9.3%,anemia heart disease 5.3%,hypertensive heart disease 2.7%,and others 3.2%. Only 5 patients were submitted to therapeutic abortion.In no case was artificial termination of pregnancy attempted after the third month of gestation. The maternal death rate in this series was 2.9%.Among the 241 pregnant cardiacs who re- ceived antenatal care,there was only one death, the death rate being 0.4%,whereas the number of deaths among 101 patients not receiving antenatal care was 9,giving a death rate of 9%.The im- portance of early and adequate management as a prognostic factor in heart disease associated with pregnancy is thus quite obvious. Heart failure due to toxemia of pregnancy carried with it a grave prognosis concerning both the mother and the fetus.Among the 10 maternal deaths in this series,6 were due to heart failure caused by toxemia of pregnancy. Although the maternal death rate from heart disease in the present study has shown a signifi- cant drop in comparison with earlier years,heart disease constituted the main cause of death in the obstetric service during the period under study. It is believed,however,that in the future,if more pregnant women can receive adequate antenatal care,a further decline in the death rate from heart disease in pregnancy may be expected.
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