INTRODUCTION Japan’s first successful lunar landing mission,Smart Lander for Investigating Moon(SLIM),was landed on the Moon on January 19th,2024.SLIM made a precise landing within 100 m of the targeted landing zone(...INTRODUCTION Japan’s first successful lunar landing mission,Smart Lander for Investigating Moon(SLIM),was landed on the Moon on January 19th,2024.SLIM made a precise landing within 100 m of the targeted landing zone(central coordinates 13.316°S,25.251°E),which is located around the Shioli crater(D=270 m,central coordinates as 13.33°S,25.23°E)in the southwestern ejecta of the Theophilus crater(D=98.6 km,central coordinates as 11.45°S,26.28°E).展开更多
GLSLIM模型(Global and Local SLIM)是基于SLIM模型(Sparse Linear Methods)并优于SLIM模型的推荐算法。它将GLOBAL模型和LOCAL模型结合,GLOBAL模型用来捕获物品在所有用户之间的相似性,LOCAL模型用来获取物品在某个用户子集中的相似性...GLSLIM模型(Global and Local SLIM)是基于SLIM模型(Sparse Linear Methods)并优于SLIM模型的推荐算法。它将GLOBAL模型和LOCAL模型结合,GLOBAL模型用来捕获物品在所有用户之间的相似性,LOCAL模型用来获取物品在某个用户子集中的相似性,通过两种模型的结合可以进一步优化用户的个性化推荐。但该算法存在天然缺陷,就是被用户评价或购买过的物品之间的相似度才可以被学习到,没有被购买过的物品之间的相似度为0。这将导致用户购买过的相似物品才有机会被推荐,相似度为0的物品无法推荐给用户。为了改善这种情况,利用一种PLSA模型解决这个问题,基于两种模型的组合进行协同过滤推荐。实验结果表明,虽然推荐结果的准确性略微降低,但是能挖掘用户的潜在兴趣。展开更多
To correct the S-distortion in large deflection angle cathode-ray tubes （CRTs）,ideal deflection current waveforms are proposed to realize S-correction.Analysis was done for homogenous and non-homogenous magnetic fie...To correct the S-distortion in large deflection angle cathode-ray tubes （CRTs）,ideal deflection current waveforms are proposed to realize S-correction.Analysis was done for homogenous and non-homogenous magnetic fields, plane and curved screen.For the convenience of circuit design,high order sine waveforms are used to approach the ideal deflection current.After optimization,the deflection current is acceptably close to the ideal one,for a deflection angle range from 90° up to 140°.Harmonic current rank rises to four as the deflection angle reaches 140°.A ladder-type driving circuit to realize these sine wave series is also presented.Simulation and experiments prove the proposed method can correct the S-distortion in a very slim CRT.展开更多
基金supported by the National Natural Science Foundation of China(Nos.42241108,42302263,62227901)the Strategic Priority Research Program of Chinese Academy of Science(No.XDB41000000).
文摘INTRODUCTION Japan’s first successful lunar landing mission,Smart Lander for Investigating Moon(SLIM),was landed on the Moon on January 19th,2024.SLIM made a precise landing within 100 m of the targeted landing zone(central coordinates 13.316°S,25.251°E),which is located around the Shioli crater(D=270 m,central coordinates as 13.33°S,25.23°E)in the southwestern ejecta of the Theophilus crater(D=98.6 km,central coordinates as 11.45°S,26.28°E).
文摘GLSLIM模型(Global and Local SLIM)是基于SLIM模型(Sparse Linear Methods)并优于SLIM模型的推荐算法。它将GLOBAL模型和LOCAL模型结合,GLOBAL模型用来捕获物品在所有用户之间的相似性,LOCAL模型用来获取物品在某个用户子集中的相似性,通过两种模型的结合可以进一步优化用户的个性化推荐。但该算法存在天然缺陷,就是被用户评价或购买过的物品之间的相似度才可以被学习到,没有被购买过的物品之间的相似度为0。这将导致用户购买过的相似物品才有机会被推荐,相似度为0的物品无法推荐给用户。为了改善这种情况,利用一种PLSA模型解决这个问题,基于两种模型的组合进行协同过滤推荐。实验结果表明,虽然推荐结果的准确性略微降低,但是能挖掘用户的潜在兴趣。
文摘To correct the S-distortion in large deflection angle cathode-ray tubes （CRTs）,ideal deflection current waveforms are proposed to realize S-correction.Analysis was done for homogenous and non-homogenous magnetic fields, plane and curved screen.For the convenience of circuit design,high order sine waveforms are used to approach the ideal deflection current.After optimization,the deflection current is acceptably close to the ideal one,for a deflection angle range from 90° up to 140°.Harmonic current rank rises to four as the deflection angle reaches 140°.A ladder-type driving circuit to realize these sine wave series is also presented.Simulation and experiments prove the proposed method can correct the S-distortion in a very slim CRT.
