184,939 research outputs found
Phortica (Ashima) pavriarista Cheng & Chen 2008
No full text14) Phortica (Ashima) pavriarista Cheng & Chen, 2008 Phortica (Phortica) pavriarista Cheng & Chen in Cheng et al., 2008: 620. Phortica speculum (Maca & Lin, 1993): Chen et al., 2005b: 420 (part, misidentification). Phortica (Ashima) pavriarista: Chen & Máca, 2012: 507. Diagnosis. Arista only very slightly expanded apically (“Fig. 14” in Cheng et al. 2008); all postgonites strongly sclerotized, apically more or less pointed; posterior postgonite on only one lateral lobe of aedeagal sheath; lateral lobes submedially separated from each other; one lateral lobe of aedeagal sheath with 2 relatively close anterior postgonites (“Fig. 17” in Cheng et al. 2008). Supplementary description (not repeating characters common to P. foliiseta). Supracervical setae 12–14. Dorsomedial, tentorial apodeme 1/2 as long as basal, parallel portion of dorsolateral, tentorial apodeme. Longest, dorsal branch of arista shorter than longest seta on pedicel. Cibarial, medial sensilla 9–10 per side; posterior sensilla 4–6 per side. All tarsi with gray tarsomere V. The antisymmetry is observed in the postgonites: in A-type, the left lateral lobe bears 2 anterior postgonites, and the right lobe 1 posterior and 1 anterior postgonites (“Fig. 17” in Cheng et al. 2008); but in B-type, vice versa. Specimen examined. Thailand: 1♂ (B-type), above Sangwal, Doi Suthep, Chiang Mai, 1,250 m a.s.l., 6.i.2008, H. Bänziger leg. (SEHU). Distribution. China (Yunnan), Thailand *. Remarks. This species resembles P. andreagigoni in having the less expanded apex of arista, but can be distinguished from it by the diagnostic characters.Published as part of Toda, Masanori J., Bänziger, Hans, Sati, Pradeep C., Fartyal, Rajendra S., Suwito, Awit & Katoh, Toru, 2020, Taxonomy and evolution of asymmetric male genitalia in the subgenus Ashima Chen (Diptera: Drosophilidae: Phortica Schiner), with descriptions of seven new species, pp. 1-54 in Zootaxa 4789 (1) on page 20, DOI: 10.11646/zootaxa.4789.1.1, http://zenodo.org/record/388461
Phortica (Ashima) nudiarista Cheng & Chen 2008
No full text15) Phortica (Ashima) nudiarista Cheng & Chen, 2008 Phortica (Phortica) nudiarista Cheng & Chen in Cheng et al., 2008: 619. Phortica brachychaeta Chen & Toda in Chen et al., 2005b: 422 (part, misidentification). Phortica (Ashima) nudiarista: Chen & Máca, 2012: 507. Diagnosis. Arista apically with distinct, leaf-like expansion narrower than long and apically tapering and pointed but neither dorsal nor ventral branches (“ Fig. 8 ” in Cheng et al. 2008); one lateral lobe of aedeagal sheath with 2 anterior postgonites widely separated; the other lateral lobe with 1 posterior and 1 anterior postgonites (“Fig. 11” in Cheng et al. 2008). Supplementary description (not repeating characters common to P. pavriarista). Supracervical setae 9–11. Cibarial, medial sensilla approximately 9 per side; posterior sensilla approximately 5 per side. The antisymmetry is observed in the postgonites: in A-type, the left lateral lobe bears 2 anterior postgonites, and the right lobe 1 posterior and 1 anterior postgonites (“Fig. 11” in Cheng et al. 2008); but in B-type, vice versa. Specimens examined. China: 1♂ (B-type), Zhengxing, Jingdong, Yunnan, 24.vii.2009 (SEHU). Thailand: 1♂ (B-type), above Sangwal, Doi Suthep, Chiang Mai, 1,250 m a.s.l., 24.vii.2008, H. Bänziger leg. (SEHU); 1♂ (Atype), above Sangwal, Doi Suthep, Chiang Mai, 1,250 m a.s.l., 9.i.2008, H. Bänziger leg. (SEHU); 1♂ (B-type), path to Pha Lad, Doi Suthep, Chiang Mai, 5.x.2008, H. Bänziger leg. (SEHU); 1♂ (B-type), path to Bung La U O, Ban Thi Pho Ji, Umphang Distr., Tak, ~ 800 m, 22.i.2008, H. Bänziger leg. (SEHU). Malaysia: 1♂ (B-type), Ulu Gombak, Selangor, 9.xii.2013, M.J. Toda leg. (SEHU). India: 1♂ (B-type), Uttarakhand, Chamoli Distr., Simli (Narainbagar), 5.ix.2010, P.C. Sati leg. (SEHU). Distribution. China (Yunnan), Thailand *, Peninsular Malaysia *, India (Uttarakhand)*. Remarks. This species resembles P. pavriarista in the morphology of the aedeagal sheath and postgonites, but can be distinguished from it by the diagnostic characters.Published as part of Toda, Masanori J., Bänziger, Hans, Sati, Pradeep C., Fartyal, Rajendra S., Suwito, Awit & Katoh, Toru, 2020, Taxonomy and evolution of asymmetric male genitalia in the subgenus Ashima Chen (Diptera: Drosophilidae: Phortica Schiner), with descriptions of seven new species, pp. 1-54 in Zootaxa 4789 (1) on page 20, DOI: 10.11646/zootaxa.4789.1.1, http://zenodo.org/record/388461
Stegana (Oxyphortica) mediospinosa Cheng, Xu & Chen, 2010, sp. nov.
No full textStegana (Oxyphortica) mediospinosa sp. nov. (Figs 1–4) Diagnosis. This species, very similar to S. (O.) setifrons in the shape of gonopods, can be differentiated from it by having the surstylus slightly inward protruded ventrally, with one sclerotized process dorsally and one strong prensiseta subbasally (Fig. 2). Description. Male and female: Frons almost dark brown. Face, clypeus and gena yellow. Mesoscutum yellow in male, brownish yellow in female. Pleura yellow below. Scutellum yellow to brownish. Abdominal tergites 2 nd and 3 rd grayish brown, 4 th to 6 th black; sternites yellow, 6 th and 7 th tergites brown to dark brown in female. Measurements. BL = 3.25 mm in the holotype (range in 53 4 ΨΨ paratypes: 2.66–3.03 in 3, 3.35– 3.50 in ΨΨ), ThL = 1.40 mm (1.16–1.34 in 3, 1.26–1.50 in ΨΨ), WL = 2.95 mm (2.08–2.33 in 3, 2.80– 3.20 in ΨΨ), WW = 1.12 mm (0.98–1.13 in 3, 1.04–1.24 ΨΨ), arb = 8 / 4 (7–9 / 4–5), avd = 1.00 (0.76 –1.00), adf = 2.00 (1.18–2.11), flw = 2.00 (1.56–1.90), FW/HW = 0.37 (0.35–0.43), ch/o = 0.08 (0.07–0.11), prorb = 1.25 (1.07–1.29), rcorb = 0.75 (0.65–0.86), vb = 0.70 (0.50–0.71), dcl = 0.51 (0.37–0.55), presctl = 0.55 (0.50–0.60), sctl = 0.92 (1.07–1.24), sterno = 0.71 (0.72–0.89), orbito = 1.56 (1.71–2.33), dcp = 0.30 (0.26– 0.35), sctlp = 0.91 (0.84–1.12), C = 3.17 (2.70–3.20), 4 c = 0.73 (0.74–0.89), 4 v = 1.52 (1.58–2.06), 5 x = 0.83 (1.00– 1.27), ac = 4.00 (3.67–3.93), M = 0.44 (0.45–0.48), C 3 F = 0.79 (0.74–0.93). Specimens examined. Holotype 3 (SCAU, No. 120486), CHINA: Mengyang (22 ° 20 'N, 100 ° 51 'E), Xishuangbanna, Yunnan, 700 m, 14.ix. 2002, H.W. Chen. Paratypes: CHINA: 2 ΨΨ (SCAU, Nos 120487,88), same data as holotype; 43 1 Ψ (KIZ) 53 (SCAU, Nos 120489 - 93), 23 1 Ψ (SCAU, Nos 120494 - 96), Menglun, Xishuangbanna, Yunnan, 21 ° 41 'N, 101 ° 25 'E, 700–900 m, 12.viii. 2001, M.J. Toda, 22.ix. 2003, H.W. Chen, 16.iv. 2007, H.W. Chen; 23 6 ΨΨ (KIZ), Mengla, Xishuangbanna, Yunnan, 21 ° 28 ΄ N, 101 ° 38 ΄ E, alt. 600 m, 22–25.iv. 2007, J.J. Gao. LAOS: 23 (SCAU, Nos 120497, 98), Reu Gnomnolat, 680 m, 25.v. 2007, X.M. Wang. Etymology. A combination of the Latin words: medius and spinosus, referring to the surstylus submedially with 1 strong prensiseta. Distribution. China (Yunnan), Laos.Published as part of Cheng, Yu, Xu, Miaofeng & Chen, Hongwei, 2010, The Stegana (Oxyphortica) convergens species group from the Oriental region (Diptera: Drosophilidae), pp. 57-63 in Zootaxa 2531 on pages 59-60, DOI: 10.5281/zenodo.19654
Stegana (Oxyphortica) apicopubescens Cheng, Xu & Chen, 2010, sp. nov.
No full textStegana (Oxyphortica) apicopubescens sp. nov. (Figs 5–8) Diagnosis. Surstylus strongly protruded anteroventrally, with 2 strong prensisetae dorsally (Fig. 6). This species is somewhat similar to S. (O.) apicosetosa sp. nov., see under that species. Description. Frons dark brown. Face yellow. Gena and clypeus brown. Mesoscutum yellow medially, brownish laterally. Pleura yellow below. Scutellum brownish. All abdominal tergites yellow medially, brown on lateral and posterior margins. Sternites yellow, tergites 6 th and 7 th brown to dark brown in female. Measurements. BL = 2.75 mm in holotype (range in 43 5 ΨΨ paratypes: 2.60–2.85 in 3, 2.78–3.52 in ΨΨ), ThL = 1.16 mm (1.18–1.20 in 3, 1.24–1.44 in ΨΨ), WL = 2.55 mm (2.50–2.60 in 3, 2.41–2.75 in ΨΨ), WW =1.00 mm (0.90–1.02 in 3, 1.13–128 in ΨΨ), arb = 7 / 4 (7–8 / 4–5), avd = 0.65 (0.62–0.95), adf = 2.25 (1.83–2.63), flw = 1.50 (1.75–2.13), FW/HW = 0.44 (0.40–0.47), ch/o = 0.08 (0.08–0.10), prorb = 1.36 (1.16–1.68), rcorb = 0.95 (0.77 –1.00), vb = 0.78 (0.59–0.75), dcl = 0.13 (0.12–0.49), presctl = 0.58 (0.43– 0.65), sctl = 1.18 (1.15–1.26), sterno = 0.81 (0.73–0.92), orbito = 2.50 (1.40 –2.00), dcp = 0.36 (0.25–0.34), sctlp = 1.19 (0.83–1.33), C = 3.36 (2.53–3.59), 4 c = 0.77 (0.68–0.91), 4 v = 1.82 (1.68–1.88), 5 x = 1.30 (1.00– 1.47), ac = 4.30 (3.36–5.33), M = 0.43 (0.43–0.57), C 3 F = 0.86 (0.81–0.93). Specimens examined. Holotype 3 (SCAU, No. 120499), CHINA: Maoershan, Guilin, Guangxi, 25 ° 51 ΄ N, 110 ° 27 ΄ E, alt. 500 m, 18.x. 2004, H.W. Chen. Paratypes: 43 (SCAU, Nos 120500 -03), same data as holotype, H.L. Cao, M.F. Xu & X.L. Zhan; 23 (SCAU, Nos 120504, 05), Chongzou, Guangxi, 22 ° 33 ΄ N, 106 ° 92 ΄ E, alt. 230 m, 23,24. viii. 2004, H.W. Chen; 73 9 ΨΨ (23 3 ΨΨ in KIZ; 53 6 ΨΨ in SCAU, Nos 120506 - 16), Huolushan, Guangdong, 23 ° 11 ΄ N, 113 ° 22 ΄ E, alt. 80 m, 5.iv. 2005, M.F. Xu. Etymology. A combination of the Latin words: apex and pubescens, referring to the gonopods with pubescence. Distribution. China (Guangdong, Guangxi).Published as part of Cheng, Yu, Xu, Miaofeng & Chen, Hongwei, 2010, The Stegana (Oxyphortica) convergens species group from the Oriental region (Diptera: Drosophilidae), pp. 57-63 in Zootaxa 2531 on pages 60-61, DOI: 10.5281/zenodo.19654
Routing Functions-an Effective Approach to Deriving One-to-Many Disjoint Paths
No full textThis paper introduces a new concept called routing functions, which have a close relation to one-to-many
disjoint paths in networks. By using a minimal routing function, a maximal number of disjoint paths whose
maximal length is minimized in the worst case can be constructed in the hypercube and the folded hypercube.
The end nodes of the paths constructed for the hypercube are not necessarily distinct. As a byproduct, the
strong Rabin number of the hypercube and the Rabin number of the folded hypercube are computed. The
latter provides a solution to an open problem raised by Liaw and Chang. A maximal number of disjoint
paths whose total length is minimized can also be constructed in the hypercube by the use of a routing
function
Stegana (Steganina) angustigena Cheng, Gao & Chen, 2009, sp. nov.
No full textStegana (Steganina) angustigena sp. nov. (Figs 7–10) Specimens examined. Holotype: ♂ (SCAU, No. 120621), CHINA: Jianfengling, Ledong, Hainan, 18°41' N, 108°52' E, altitude 700 m, 19.v.2004, on tree trunks, HW Chen. Paratypes: CHINA: 6♂ 10♀ (3♂ 5♀ in KIZ; 3♂ 5♀ in SCAU, Nos 120692-99), same data as holotype except for 20.iv.2008, XP Chen, JJ Gao; 2♂ 3♀ (SCAU, Nos 120622-26), Wuzhishan, Hainan, 18°48ʹ N, 109°19ʹ E, altitude 440 m, 20.iv.2007, on tree trunks, HZ Cao, T Li; 1♂ (SCAU, No. 120627), Nonggang, Chongzuo, Guangxi, 22°33ʹ N, 106°92ʹ E, altitude 230 m, 23.viii.2004, on tree trunks, HW Chen; 4♀ (KIZ), Menglun, Xishuangbanna, Yunnan, 21°41' N, 101°25' E, altitude 880 m, 16–19.iv.2007, ex tussock, JJ Gao; 3♂ 14♀ (1♂ 1♀ on tree trunks) (1♂ 6♀ in KIZ; 1♂ 6♀ in SCAU, Nos 120628-34, 1♂ 2♀ in SEHU), Mengla, Xishuangbanna, Yunnan, 21°28' N, 101°38' E, altitude 600 m, 21–24.iv.2007, ex tussock, HW Chen, JJ Gao, F Zhao. Diagnosis. Surstylus strongly curved submedially (Fig. 8); aedeagus composed of 1 lobe-like and 1 pair of slender, rod-like processes; the lobe-like process bifurcated distally, with pubescence (Fig. 10). Description. Male and female: Pedicel brown; first flagellomere black. Palpus black. Mesonotum brown to dark brown, without stripe. Scutellum dark brown to black. Katepisternum brown on upper part, yellow on lower part. Legs white-yellow, brown on apical part of fore femur, dark brown to black medially on mid and hind femora, with 2 dark brown rings on all tarsomeres. Fore femur with 4–5 setae on distal part of ventral surface. All abdominal tergites and sternites dark brown to black. Male terminalia: Epandrium with approximately 30 setae near posterior to ventral margin on each body-side (Fig. 7). Cercus lacking pubescence (Fig. 7). Plate between hypandrium and aedeagus slightly pubescent (Fig. 10). Measurements. BL = 2.25 mm in holotype (range in 4♂ 5♀ paratypes: 2.13–2.47 mm in ♂, 2.28–2.91 mm in ♀); ThL = 1.13 mm (1.00– 1.22 mm in ♂, 1.09–1.38 mm in ♀); WL = 1.84 mm (1.74–1.90 mm in ♂, 1.88–2.28 mm in ♀); WW = 1.00 mm (0.98–1.24 mm in ♂, 1.04–1.26 mm in ♀). Indices: arb = 8/6 (7–9/6–7), avd = 0.86 (0.67–0.82), adf = 1.27 (1.36–1.80), flw = 1.91 (1.80–2.10), FW/HW = 0.34 (0.33–0.40), ch/o = 0.06 (0.06–0.09), prorb = 1.28 (1.05–1.25), rcorb = 0.78 (0.71–0.94), vb = 0.21 (0.20–0.33), dcl = 0.40 (0.38– 0.47), presctl = 0.54 (0.47–0.61), sctl = 1.29 (1.46–1.72), sterno = 0.81 (0.80–0.93), orbito = 2.50 (2.00–2.50), dcp = 0.20 (0.16–0.24), sctlp = 1.06 (0.94–1.18), C = 1.89 (1.78–2.12), 4c = 1.33 (1.17–1.37), 4v = 1.81 (1.68–1.81), 5x = 1.30 (1.08–1.30), ac = 9.33 (7.50–10.00), M = 0.62 (0.52–0.62), C3F = 0.69 (0.56–0.73). Distribution. China (Guangxi, Hainan, Yunnan). Etymology. A combination of the Latin words: angustus and gena, referring to the narrow gena.Published as part of Cheng, Yu, Gao, Jian-Jun & Chen, Hong-Wei, 2009, Stegana ornatipes species group from the Oriental Region (Diptera: Drosophilidae), pp. 37-48 in Zootaxa 2216 (1) on pages 41-42, DOI: 10.11646/zootaxa.2216.1.3, http://zenodo.org/record/532186
Comparison of Fuzzy Time Series Chen and Cheng to Forecast Indonesia Rice Productivity
No full textBased on BPS data in 2019, around 90% of Indonesians consume rice as the main product of their carbohydrate needs. With the fourth most populous country in the world, Indonesia's rice consumption in 2021 will reach 31.50 million tons. Indonesia's rice production is currently not able to supply the needs of domestic rice consumption. Therefore, the Indonesian government chose to import rice for supply the needs of domestic rice consumption. Forecasting method can help the government to reduce uncertainty about the future of rice productivity. This research will discuss the comparison of the forecasting results of fuzzy timeseries using chen and cheng models in forecasting rice productivity in Indonesia. The comparison based on the percentage of eror or in this research the MAPE value is used as an indicator. The MAPE value obtained using chen model is 18% and using cheng model is 12%. The result of data analysis found that the MAPE value using cheng model is smaller than using chen model. It means that the cheng model is more appropriate used in forecasting data of Indonesia productivity rice. However the chen and cheng models both give good forecasting result because the MAPE value is less than 20
Peramalan Curah Hujan Di Kabupaten Banyumas Menggunakan Metode Fuzzy Time Series Model Chen Dan Model Cheng
No full textIndonesia merupakan negara agraris yang sangat bergantung pada sektor pertanian. Di Provinsi Jawa Tengah, sektor pertanian, terutama produksi padi, menjadi tulang punggung ekonomi lokal, termasuk di Kabupaten Banyumas. Curah hujan yang tidak menentu akibat perubahan iklim memberikan dampak signifikan terhadap keberhasilan produksi pertanian. Oleh karena itu, diperlukan suatu metode peramalan curah hujan yang akurat guna membantu petani dalam merencanakan masa tanam dan mengurangi risiko kerugian. Penelitian ini bertujuan untuk meramalkan curah hujan di Kabupaten Banyumas dengan menggunakan metode penelitian yaitu metode Fuzzy Time Series (FTS) model Chen dan model Cheng, serta membandingkan tingkat akurasi dari kedua metode tersebut. Data yang digunakan dalam penelitian ini merupakan data sekunder berupa data curah hujan bulanan Kabupaten Banyumas dari Januari 2020 hingga Desember 2024 yang diperoleh dari Badan Pusat Statistik (BPS). Untuk pengolahan datanya dengan software R Studio. Tahapan analisis meliputi penentuan interval kelas, pembentukan himpunan fuzzy, fuzzifikasi data, pembentukan relasi fuzzy, serta peramalan menggunakan model Chen dan Cheng. Hasil penelitian menunjukkan bahwa kedua metode mampu mengikuti pola data aktual dengan cukup baik. Namun, metode FTS model Cheng menghasilkan pola yang lebih mendekati data aktual dibandingkan model Chen. Hal ini dilihat dari nilai Root Mean Square Error (RMSE) yang lebih rendah pada model Cheng, yaitu sebesar 0,13 dibandingkan dengan model Chen sebesar 0,18. Dengan demikian, metode FTS model Cheng dinilai lebih baik dalam meramalkan curah hujan di Kabupaten Banyumas
Fading performance evaluation of a semi-blind space-time equaliser for frequency selective MIMO systems
No full textA semi-blind adaptive space–time equaliser (STE) has recently been proposed based on a concurrent gradient-Newton(GN) constant modulus algorithm (CMA) and soft decision-directed (SDD) scheme for dispersive multiple-input multiple-output (MIMO) systems that employ high-throughput quadrature amplitude modulation signalling. A minimum number of training symbols, approximately equal to the dimension of the STE, is used to provide a rough initial estimate of the STE’s weight vector. The concurrent GN based CMA and SDD blind adaptive scheme is then adopted to adapt the STE. This semi-blind STE has a complexity similar to that of the training-based recursive least squares (RLS) algorithm. For stationary MIMO channels, it has been demonstrated that this semi-blind adaptive STE is capable of converging fast to the optimal minimum mean square error STE solution. In this contribution, we investigate the performance of this semi-blind adaptive STE operating in Rayleigh fading MIMO systems. Our results obtained show that the tracking performance of this semi-blind adaptive algorithm is close to that of the training-based RLS algorithm. Thus, this semi-blind adaptive STE offers an effective and practical means to successfully operate under the highly dispersive and fading MIMO environment
Vies parallèles et mouvementées de Peng Shuzhi et Chen Bilan
No full textYingxiang Cheng, Cadart Claude. Vies parallèles et mouvementées de Peng Shuzhi et Chen Bilan. In: Perspectives chinoises, n°46, 1998. pp. 37-43
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