There are many various kinds of English language tests in the world,ranging from IELTS(International English Lan⁃guage Testing System)to TOEFL(Test of English as a Foreign Language).All these tests are designed for di...There are many various kinds of English language tests in the world,ranging from IELTS(International English Lan⁃guage Testing System)to TOEFL(Test of English as a Foreign Language).All these tests are designed for different purposes relat⁃ing to various groups of testees.Usually the English language test covers the testing of the four language skills of reading,writing,listening and speaking.The essay will discuss the relationship between the nature of four skills and the test design respectively.展开更多
China’s Ministry of Commerce(MOFCOM)and the Ministry of Industry and Information Technology(MIIT)have designed a stress-test for China’s labor-intensive industries,
The test scheme of static postponing time given in our actual national military test standard on shrapnels used to control riot is a nine-point test scheme on the combined action of three kinds of temperatures and thr...The test scheme of static postponing time given in our actual national military test standard on shrapnels used to control riot is a nine-point test scheme on the combined action of three kinds of temperatures and three kinds of pressures, the consumed ammunitions are more excessive. Statistic analysis and tentative checkout about a lot of test data are done, feasibility gists are put forward for optimizing of the test design scheme. The optimizing design and data analysis of test scheme of the item are done by managing uniformity design theory, two scientific and reasonable six-point test schemes are confirmed. The feasibility and reliability of the optimizing design schemes put forward above are proved ulteriorly by test validating. The gained schemes not only have good design uniformity and little ammunition wastage and meet the test demand, but also have better forecast ability for the result data of other points using the mathematic models from the actual test points.展开更多
A differential accelerometer comprising of two rotating masses made of the same material is proposed for drop tower-based free-fall testing of the spin-spin force between the rotating mass and the Earth. The measureme...A differential accelerometer comprising of two rotating masses made of the same material is proposed for drop tower-based free-fall testing of the spin-spin force between the rotating mass and the Earth. The measurement is performed by placing the two concentric masses of very different momenta in a vacuum drop capsule which is falling freely in the Earth＇s gravitational field. A nonzero output of the differential aeeelerometer is an indication of possible violation of new equivalence principle （NEP）. We present the conceptual design of a modified free-fall NEP experiment which can be performed at the Belting drop tower. Design and evaluation of the differential accelerometer with a hybrid electrostatic/magnetic suspension system are presented to accommodate for operation on ground and drop-tower tests. Details specific to the measurement uncertainty are discussed to yield an NEP test accuracy of 7.2×10^-9.展开更多
Testable design techniques for systolic motion estimators based on M-testability conditions are proposed in this paper. The whole motion estimator can be viewed as a two-dimensional iterative logic array （ILA） of pr...Testable design techniques for systolic motion estimators based on M-testability conditions are proposed in this paper. The whole motion estimator can be viewed as a two-dimensional iterative logic array （ILA） of processing elements （PEs） and multiplying elements （MULs）. The functions of each PE and MUL are modified to be bijective to meet the M-testable conditions. The number of test patterns is 2^w, where w denotes the word length of a PE. The proposed testable design techniques are also suitable for built-in self-test implementation. According to experimental results, our approaches can achieve 99.27 % fault coverage. The area overhead is about 9 %. To verify our approaches, an experimental chip is also implemented.展开更多
A kind of pseudo Gray code presentation of test patterns based on accumulation generators is presented and a low power test scheme is proposed to test computational function modules with contiguous subspace in very la...A kind of pseudo Gray code presentation of test patterns based on accumulation generators is presented and a low power test scheme is proposed to test computational function modules with contiguous subspace in very large scale integration （VLSI）, especially in digital signal processors （DSP）. If test patterns from accumulators for the modules are encoded in the pseudo Gray code presentation, the switching activities of the modules are reduced, and the decrease of the test power consumption is resulted in. Results of experimentation based on FPGA show that the test approach can reduce dynamic power consumption by an average of 17.40% for 8-bit ripple carry adder consisting of 3-2 counters. Then implementation of the low power test in hardware is exploited. Because of the reuse of adders, introduction of additional XOR logic gates is avoided successfully. The design minimizes additional hardware overhead for test and needs no adjustment of circuit structure. The low power test can detect any combinational stuck-at fault within the basic building block without any degradation of original circuit performance.展开更多
文摘There are many various kinds of English language tests in the world,ranging from IELTS(International English Lan⁃guage Testing System)to TOEFL(Test of English as a Foreign Language).All these tests are designed for different purposes relat⁃ing to various groups of testees.Usually the English language test covers the testing of the four language skills of reading,writing,listening and speaking.The essay will discuss the relationship between the nature of four skills and the test design respectively.
文摘China’s Ministry of Commerce(MOFCOM)and the Ministry of Industry and Information Technology(MIIT)have designed a stress-test for China’s labor-intensive industries,
文摘The test scheme of static postponing time given in our actual national military test standard on shrapnels used to control riot is a nine-point test scheme on the combined action of three kinds of temperatures and three kinds of pressures, the consumed ammunitions are more excessive. Statistic analysis and tentative checkout about a lot of test data are done, feasibility gists are put forward for optimizing of the test design scheme. The optimizing design and data analysis of test scheme of the item are done by managing uniformity design theory, two scientific and reasonable six-point test schemes are confirmed. The feasibility and reliability of the optimizing design schemes put forward above are proved ulteriorly by test validating. The gained schemes not only have good design uniformity and little ammunition wastage and meet the test demand, but also have better forecast ability for the result data of other points using the mathematic models from the actual test points.
基金Supported by the National Natural Science Foundation of China under Grant Nos 91436107 and 61374207
文摘A differential accelerometer comprising of two rotating masses made of the same material is proposed for drop tower-based free-fall testing of the spin-spin force between the rotating mass and the Earth. The measurement is performed by placing the two concentric masses of very different momenta in a vacuum drop capsule which is falling freely in the Earth＇s gravitational field. A nonzero output of the differential aeeelerometer is an indication of possible violation of new equivalence principle （NEP）. We present the conceptual design of a modified free-fall NEP experiment which can be performed at the Belting drop tower. Design and evaluation of the differential accelerometer with a hybrid electrostatic/magnetic suspension system are presented to accommodate for operation on ground and drop-tower tests. Details specific to the measurement uncertainty are discussed to yield an NEP test accuracy of 7.2×10^-9.
文摘Testable design techniques for systolic motion estimators based on M-testability conditions are proposed in this paper. The whole motion estimator can be viewed as a two-dimensional iterative logic array （ILA） of processing elements （PEs） and multiplying elements （MULs）. The functions of each PE and MUL are modified to be bijective to meet the M-testable conditions. The number of test patterns is 2^w, where w denotes the word length of a PE. The proposed testable design techniques are also suitable for built-in self-test implementation. According to experimental results, our approaches can achieve 99.27 % fault coverage. The area overhead is about 9 %. To verify our approaches, an experimental chip is also implemented.
基金supported by the National Natural Science Foundation of China under Grant No.90407007University Science Foundation of China under Grant No R0820207
文摘A kind of pseudo Gray code presentation of test patterns based on accumulation generators is presented and a low power test scheme is proposed to test computational function modules with contiguous subspace in very large scale integration （VLSI）, especially in digital signal processors （DSP）. If test patterns from accumulators for the modules are encoded in the pseudo Gray code presentation, the switching activities of the modules are reduced, and the decrease of the test power consumption is resulted in. Results of experimentation based on FPGA show that the test approach can reduce dynamic power consumption by an average of 17.40% for 8-bit ripple carry adder consisting of 3-2 counters. Then implementation of the low power test in hardware is exploited. Because of the reuse of adders, introduction of additional XOR logic gates is avoided successfully. The design minimizes additional hardware overhead for test and needs no adjustment of circuit structure. The low power test can detect any combinational stuck-at fault within the basic building block without any degradation of original circuit performance.
