Introduction: Dieulafoy's lesion (DL) presented with small bowel bleeding constitutes a group of rare and potentially life-threatening prognosis. Several case series have described this condition, yet it remains unclear as to what is the optimal treatment and predicted outcome for patients who have been diagnosed. Patient concerns: We present a 21-year-old male experiencing bloody stool for 1 day. Diagnosis: Computed tomography of the abdomen exhibited active contrast extravasations and segmental wall thickening in the jejunum, and enteroscopy showed one 15-millimeter sized subepithelial tumor at the proximal jejunum. Interventions: Due to unstable vital signs he received an emergent transcatheter arterial embolization, and surgeon performed a laparoscopic surgical resection thereafter under the impression of potential malignancy. The pathologist confirmed jejunal DL with organizing thrombus. Outcomes: He was discharged on the 8th day of hospitalization without recurrent bleeding. Conclusion: A systematic literature review of 98 published cases taken from PubMed dating back to 1978 was undertaken, and the patients with DL and small bowel bleeding involved mainly the jejunum, followed by the duodenum and ileum. Meanwhile, DL-related duodenal bleeding was diagnosed mostly by an enteroscopy, as well as endoscopic interventions. Jejunal and ileal bleeding due to DL was surveyed through endoscopy and surgery, while surgical resection remained the choice for bleeding cessation. Only anticoagulant use (OR = 18.16; P = .08) was associated with a higher risk of overall mortality, although it was non-significant in univariate analysis. We emphasize that individualized treatment as well as prompt measurement should be implemented accordingly.

Novel planar dual-band bandpass filters with stepped-impedance resonators have been proposed. The central frequency of dual passbands can be easily controlled by the stepped-impedance resonators. Moreover, two steppedimpedance open stubs can generate transmission zero between two passbands, therefore the isolation can be increased. With the proposed structure, additional transmission zeros will appear around two passbands. In addition, the match between measurement and the theoretical simulation validates the proposed structure.Index Terms -Dual-band bandpass filter, stepped-impedance resonator.

An adaptive resource allocation for multiaccess MIMO/OFDM systems was developed to enhance power efficiency by exploiting multiuser diversity, and channel variations in the time, frequency, and space domains [1]. However, by increasing the number of antennas, the scheme has a limitation in the affordable maximum data rate due to constraints on the maximum modulation order even without transmit power constraint. More antennas should allow more users to share the same subcarriers such that total affordable maximum data rates should increase accordingly. The paper presents an enhanced version of the scheme to remedy this problem. After the subcarrier assignment, the proposed scheme relaxes the maximum modulation order constraint in the bit loading process and presents an iterative bit swapping procedure, which are the two points deviated from the scheme in [1] and solve the related above-mentioned problem. A model of the multi-user channel on uplink with subcarrier reuse is considered. The proposed scheme aims to minimize the total user transmit power while satisfying the required data rates, the maximum transmit power constraint, and the bit error rate of each user. The proposed algorithm offers better performance than the high complexity greedy multi-user algorithm as illustrated in the simulation results. 0-35% improvement in terms of percentage in meeting the required data rates is observed from the simulation results and 0~5 dB transmit power gain is achieved.