Task-Driven Dictionary Learning for Hyperspectral Image Classification with Structured Sparsity Constraints

Sparse representation models a signal as a linear combination of a small number of dictionary atoms. As a generative model, it requires the dictionary to be highly redundant in order to ensure both a stable high sparsity level and a low reconstruction error for the signal. However, in practice, this requirement is usually impaired by the lack of labelled training samples. Fortunately, previous research has shown that the requirement for a redundant dictionary can be less rigorous if simultaneous sparse approximation is employed, which can be carried out by enforcing various structured sparsity constraints on the sparse codes of the neighboring pixels. In addition, numerous works have shown that applying a variety of dictionary learning methods for the sparse representation model can also improve the classification performance. In this paper, we highlight the task-driven dictionary learning algorithm, which is a general framework for the supervised dictionary learning method. We propose to enforce structured sparsity priors on the task-driven dictionary learning method in order to improve the performance of the hyperspectral classification. Our approach is able to benefit from both the advantages of the simultaneous sparse representation and those of the supervised dictionary learning. We enforce two different structured sparsity priors, the joint and Laplacian sparsity, on the task-driven dictionary learning method and provide the details of the corresponding optimization algorithms. Experiments on numerous popular hyperspectral images demonstrate that the classification performance of our approach is superior to sparse representation classifier with structured priors or the task-driven dictionary learning method

Analysis of 116 cases of rectal cancer treated by transanal local excision

BACKGROUND: The purpose of this research was to evaluate the therapeutic effects and prognostic factors of transanal local excision (TAE) for rectal cancer. METHODS: We retrospectively analyzed 116 cases that underwent TAE for rectal cancer from 1995 to 2008. A Cox regression analysis was used to analyze prognostic factors. RESULTS: The survival times for the patients were from 14 to 160.5 months (median time, 58.5 months). The 5-year and 10-year overall survival rates were 72% and 53%, respectively. In all 16 cases experienced local recurrence (13.8%). Pathological type, recurrence or metastasis, and depth of infiltration (T stage) were the prognostic factors according to the univariate analysis, and the latter two were independent factors affecting patient prognosis. For patients with T1 stage who underwent adjuvant radiotherapy, there was no local recurrence; for those in T2 stage, the local recurrence rate was 14.6%. In addition, there was no difference between the patients who received radiotherapy and those who did not (T1: P = 0.260, T2: P = 0.262 for survival rate and T1: P = 0.480, T2: P = 0.560 for recurrence). CONCLUSIONS: The result of TAE for rectal cancer is satisfactory for T1 stage tumors, but it is not suitable for T2 stage tumors

Sedimentation in the Three Gorges Dam and the future trend of Changjiang (Yangtze River) sediment flux to the sea

The Three Gorges Dam (TGD) on the upper Changjiang (Yangtze River), China, disrupts the continuity of Changjiang sediment delivery to downstream and coastal areas. In this study, which was based on 54 years of annual water and sediment data from the mainstream and major tributaries of Changjiang, sediment deposition induced by the TGD in 2003–2008 was quantified. Furthermore, we determined the theoretical trapping efficiency of the cascade reservoir upstream of the TGD. Its impact on Changjiang sediment flux in the coming decades is discussed. Results show that about 172 million tons (Mt) of sediment was trapped annually by the TGD in 2003–2008, with an averaged trapping efficiency of 75%. Most of the total sediment deposition, as induced by the TGD (88%), accumulated within the region between the TGD site and Cuntan. However, significant siltation (12% of the total sediment deposition) also occurred upstream of Cuntan as a consequence of the upstream extended backwater region of the TGD. Additionally, the Changjiang sediment flux entered a third downward step in 2001, prior to operation of the TGD. This mainly resulted from sediment reduction in the Jinshajiang tributary since the late 1990s. As the cascade reservoir is put into full operation, it could potentially trap 91% of the Jinshajiang sediment discharge and, therefore, the Jinshajiang sediment discharge would most likely further decrease to 14 Mt/yr in the coming decades. Consequently, the Changjiang sediment flux to the sea is expected to continuously decrease to below 90 Mt/yr in the near future, or only 18% of the amount observed in the 1950s. In the presence of low sediment discharge, profound impacts on the morphology of estuary, delta and coastal waters are expected

Analisis Pajak Penghasilan Pasal 23 Atas Jasa Freight Forwarding Pada PT Armarda Samudera Samarinda

Penelitian ini akan dibahas mengingat kegiatan Jasa Freight Forwarding yang dilakukan oleh PT. Armada Samudera Raya merupakan objek PPh Pasal 23 yang harus dilakukan perhitungan, pemotongan, penyetoran dan pelaporan di kantor pajak yang terdekat. Dalam menjalankan USAha jasa Freight Forwarding pada PT. Armada Samudera menggunakan pihak ketiga atau sistem Reimbursement. Mengetahui perhitungan dan pemotongan PPh pasal 23 atas jasa Freight Forwarding yang termasuk jenis jasa lain, dasar pengenaan objek pemotongan PPh 23 sebesar 2 % dari jumlah bruto (Penghasilan).Rumusan masalah dalam penelitian ini adalah “Apakah pemotongan Pajak Penghasilan (PPh) Pasal 23 atas jasa freight forwarding pada PT. Armada Samudera Raya telah sesuai dengan Peraturan Menteri Keuangan 141/PMK.03/2015 dan Undang-Undang Nomor 36 Tahun 2008?”. Alat analisis yang digunakan adalah perhitungan PPh berdasarkan Peraturan Menteri Keuangan Nomor 141/pmk.03/2015 dan Undang-Undang Nomor 7 Tahun 1983 tentang Pajak Penghasilan yang telah diubah terakhir dengan Undang-Undang Nomor 36 Tahun 2008 mewajibkan setiap Perusahaan sebagai wajib pajak untuk melakukan pemotongan PPh 23 sebesar 2 % dari jumlah bruto (Penghasilan) dan membadingkannya dengan perhitungan Perusahaan. Hasil dari penelitian ini adalah Hipotesis diterima apabila pemotongan Pajak Penghasilan (PPh) Pasal 23 atas jasa freight forwarding pada PT. Armada Samudera Raya belum sesuai dengan Peraturan Menteri Keuangan 141/PMK.03/2015 dan Undang-Undang Nomor 36 Tahun 2008 dan sebaliknya Hipotesis ditolak apabila pemotongan Pajak Penghasilan (PPh) Pasal 23 atas jasa freight forwarding pada PT. Armada Samudera Raya sudah sesuai dengan Peraturan Menteri Keuangan 141/PMK.03/2015 dan Undang-Undang Nomor 36 Tahun 2008

Chinese eye exercises and myopia development in school age children: a nested case-control study

Chinese eye exercises have been implemented in China as an intervention for controlling children’s myopia for over 50 years. This nested case-control study investigated Chinese eye exercises and their association with myopia development in junior middle school children. Outcome measures were the onset and progression of myopia over a two-year period. Cases were defined as 1. Myopia onset (cycloplegic spherical equivalent ≤ −0.5 diopter in non-myopic children). 2. Myopia progression (myopia shift of ≥1.0 diopter in those who were myopic at baseline). Two independent investigators assessed the quality of Chinese eye exercises performance at the end of the follow-up period. Of 260 children at baseline (mean age was 12.7 ± 0.5 years), 201 were eligible for this study. There was no association between eye exercises and the risk of myopia-onset (OR = 0.73, 95%CI: 0.24–2.21), nor myopia progression (OR = 0.79, 95%CI: 0.41–1.53). The group who performed high quality exercises had a slightly lower myopia progression of 0.15 D than the children who did not perform the exercise over a period of 2 years. However, the limited sample size, low dosage and performance quality of Chinese eye exercises in children did not result in statistical significance and require further studies