Analysis of Bluetooth RSSI for Proximity Detection of Ship Passengers

Concern about the health of people who traveled onboard was raised during the COVID-19 outbreak on the Diamond Princess cruise ship. The ship’s narrow space offers an environment conducive to the virus’s spread. Close contact isolation remains one of the most critical current measures to stop the virus’s rapid spread. Contacts can be identified efficiently by detecting intelligent devices nearby. The smartphone’s Bluetooth RSSI signal is essential data for proximity detection. This paper analyzes Bluetooth RSSI signals available to the public and compares RSSI signals in two distinct poses: standing and sitting. These features can improve accuracy and provide an essential basis for creating algorithms for proximity detection. This allows for improved accuracy in identifying close contacts and can help ships sustainably manage persons onboard in the post-epidemic era.

On-chip light scattering imaging of the guanine platelet

A guanine platelet is a very thin optical component that plays a role in light reflection control in the narrow space within the body of a fish. However, the details of this light control mechanism have not been revealed to date. In this work, guanine micro-platelets floating in water are visualized via light projection near an image sensor. These guanine platelets demonstrate light scattering toward specific directions. By setting a thin water layer on top of the image sensor’s cover glass, each platelet in the water layer forms column- or bar-code-shaped images on the screen. The existence of nanohole gratings in these platelets was confirmed by high-resolution optical microscopy. Numerical electromagnetic simulations indicated that the nanohole gratings contributed to the formation of unique light projection spots.

SURGICAL TREATMENT OF PATIENTS WITH EXTRAORGANIC TUMORS OF THE PELVIC LOCALIZATION WITH INVASION OF THE ILIAC VESSELS

The aim of our study was to determine the indications for expanding the scope of operations in patients with pelvic extraorgan local formations. Materials and methods. The results of surgical treatment of 7 patients with nonorgan tumors of the pelvic localization, who underwent resection on the main vessels in connection with their involvement in the tumor process, are presented. Results and discussion. A total of 7 interventions were performed on the iliac arteries — 2 resections with an end-to-end anastomosis and 5 prostheses (one case — the aorta resection with reconstruction with a bifurcation prosthesis). Patients with pelvic extraorgan tumors are a special cohort of patients, due to the presence of several organs in a narrow space, which inevitably causes them to fit snugly to the tumor. Locally advanced tumor process in extraorganic tumors involving the main vessels of the pelvis and adjacent organs is not a reason to refuse surgery, and despite the complications, repeated recurrences and previous operations, are well tolerated by patients. This is especially important due to the lack of a real alternative to surgical treatment of this group of patients. Conclusions. Surgical intervention in the treatment of pelvic inorganic tumors involving the main vessels is the only radical method of treatment. Invasion of the main arterial and venous vessels is not a contraindication to surgery in patients with pelvic tumors. Combined angioplastic interventions allow to achieve a long without recurrent period even after cytoreductive operations.

A Miniaturized Planar Monopole Antenna Based on a Coupling Structure for Compact Mobile Internet of Things (IoT) and Electric Vehicles (EVs) Device Applications in 5G, LTE, WLAN, WiMAX, Sirius/XM Radio, V2X, and DSRC Wireless Systems

A miniaturized internal antenna with monopole structure is constituted, including three radiating strips of a compact prototype and a back-coupling pad to improve the impedance matching, which achieves a wide bandwidth of 2.972 GHz between the operating frequencies of 2315–5285 MHz, and is introduced and researched. There is an urgent need for a complete frequency-continuous and large bandwidth design in the current wireless communication design to achieve a multimode, multifrequency, physical phenomenon design with large bandwidth and continuous operating frequency. The recommended antenna provides a broadband operation in an electric vehicles (EVs) and Internet of Things (IoT) devices application embedded in the wireless communication standard for 5G, LTE, V2X, WLAN, WiMAX, Sirius/XM Radio, V2X, and DSRC to support the multiband application. This design is embedded side edge of overall placement in the device and is integrated applicable to the trend of heterogeneous wireless multiple access networks in electric vehicle and Internet of Things system devices, which covered the 5G with supporting the band of n7/n38/n40/n53/n77/n78/n79/n90, the 4G with supporting the band of 7/38/40/41/42/43/48/67, the V2X and DSRC for the operating frequencies between 2500 and 5000 MHz, the Sirius/XM Radio for the operating frequencies of 2320–2345 MHz, the ISM band of WiFi and BT covering the band of 2450–2483.5 and 5150–5350 MHz, and the WiMAX also supporting the band of 2300–2690 and 3400–3690 MHz. Moreover, the compact antenna manufactured an FR4 material with the antenna area of 5 × 10 × 0.8 mm3 and the ground area of 33.5 × 10 × 0.8 mm3. The proposed design better benefits a narrow space on the PCB with a low profile and is easy to make with a circuit board design.

Depth of the field. Bystanders’ art, forensic art practice and non-sites of memory

Abandoned sites of trauma often become objects of art-based research. The forensic turn offered artists the requisite tools to approach uncommemorated post-violence sites to interact with their human and non-human actors. The usage of artistic methods allows us to inspect nondiscursive archives and retrieve information otherwise unavailable. The new wave of “forensic art” joins the efforts of post-war artists to respond to sites of mass killings. In the post-war era, sites of trauma were presented as (implicated) landscapes, or unhospitable terrains. The tendency to narrow space to the site and to contract the perspective is continued today by visual artists entering difficult memory grounds, looking down, inspecting the ground with a “forensic gaze”. A set of examples of such artistic endeavors, following the research project Uncommemorated Genocide Sites and Their Impact on Collective Memory, Cultural Identity, Ethical Attitudes and Intercultural Relations in Contemporary Poland (2016–2020) is discussed as “bystanders’ art.”

Respon Tanaman Bawang Merah Pada Beberapa Jarak Tanam Dalam Pola Tanam Tumpangsari Dengan Jagung

The implementation of intercropping is one alternative that can be done to increase the diversity of crops cultivated by farmers, due to the increasing activity of land conversion and limited ownership. The practices of growing several types of crops on the same land and time can provide several advantages. The plantation of corn and shallot on the same field and at the relatively same time will contribute to meet the community's needs for food and feed, especially during the current covid-19 pandemic. The use of various spacing of shallot within corn plantations is expected to increase income and land-use efficiency. The results showed that narrow space of shallots (10 cm × 15 cm) gave a higher unit area yield, and a wider space (20 cm × 20 cm) gave a higher land equivalence ratio comparing to other plant spacing (10cm × 15cm, and 10cm × 20cm).

REHABILITATION OF MASTICATION AND LACK OF SPACE TREATMENT IN NARROW EDENTULOUS WITH FIXED-FIXED BRIDGE

Background: Loss of posterior teeth can lead to disharmony in the curvature of the jaw. Antagonistic teeth and surrounding teeth will migrate to the edentulous causing reduced mastication function and TMJ disturbance. Several cases of narrow edentulous occurred due to tooth shifting caused by edentulous that was left empty for a long period. Creating a fixed-fixed bridge is aimed to restore the aesthetics, function, and comfort for patients which caused by the missing teeth. Fixed-fixed bridge consist of a retainer that function as a support to the abutment; a pontic that function to replace the missing tooth; and a connector that function to connect the pontic and the retainer. A narrow space for pontics can disrupt the aesthetic and functional aspects. Case Report: A 24 year-old male patient was referred to Prosthodontic Clinic, Gusti Hasan Aman Dental Hospital with a complain of pain on the jaw joint and missing of left lower molar for about 5 years. Patient always masticate on one side after the left lower molar was missing. Extraoral examination found the patient to be in good condition, no enlargement of major salivary glands, the vital signs were good, but upon TMJ examination there was clicking sounds on the left side. Intraoral examination showed space narrowing resulted from mesial and distal drifting of 37 and 35 but not significant, therefore it was still possible to perform rehabilitation using fixed-fixed bridge with abutments on 37 and 35 with modification of pontic shape for 36 to resemble a premolar tooth with occlusal surface resembling a molar tooth. Treatment planning for fixed prosthetic using fixed-fixed bridge with porcelain fused to metal material on 35, 36, and 37 with ridge lap pontic type modification Conclusions: Treatment was successful to provide enough space for the pontic by modification of the shape and the size of the pontic. Keywords: Fixed-fixed bridge. lack of space, mastication.