A write blocker allows read-only access to digital data on a secondary storage device by placing a hardware or software filter between the host computer and the storage device. The filter monitors I/O commands sent from the application on the host computer, only allowing commands to the device that make no changes to its data. This paper examines the I/O commands used to access secondary storag...

In this work, we propose a degraded transistor-based circuit degradation simulation method to investigate the degradation effect in complementary metal-oxide semiconductor (CMOS) biomedical devices. The method is demonstrated on an operational transconductance amplifier and capacitor (OTA-C)-based CMOS filter structure. First, we simulate the degradation of the symmetrical CMOS OTA by determini...

New approach to hardware FIR filter implementation is described in this paper. Method includes the conversion to the frequency domain, as well as the principles of residue number systems and number-theoretic transforms. Parameterized RTL IP-core generators were implemented for both conventional and developed methods. These IP generators were used to implement different devices for different fil...

冷温水槽など水路回路を備える装置の衛生管理の重要性が指摘され、対策の一つとして、冷温水槽循環水回路に組み込む除菌フィルターが開発された。除菌フィルター装着に伴い、流路抵抗が増加することによる熱交換能への影響について、実験回路を作製し検討を行った。除菌フィルター装着により、循環水流量は38％低下し、それに伴い人工肺入口出口温度較差は最大0.4℃低下し、熱交換係数は最大10％低下した。血流量を考慮した熱移動量では最大14％低下した。したがって、冷温水槽循環水回路への除菌フィルター装着による熱交換能への影響は少なからず発生した。しかし、人工肺入口出口温度較差はどの血流量でも最大0.4℃であり、冷温水槽の温度設定や操作のタイミングを検討することで十分対応が可能な範囲の影響であり、冷温水槽循環水の清浄度を担保するデバイスとしてはとても有用であった。今後は、その他の熱交換器における影響を確認する...

Reshaping of ultrashort optical pulses at 1.53 ,um by using an integrated acousto-optic tunable filter is reported. Control of the optical pulse shape is accomplished by adjusting the different radio-frequency electrical signals driving the acousto-optic filter. This is to our knowledge the first demonstration of ultrashort pulse shaping using an integrated-optic device and establishes a new ap...

We present a Field Programmable Logic Devices (FPLDs) based implementation of a scalable filter architecture capable of detecting and removing impulsive noise in image sequences. The adaptive filter architecture is built using switching spatiotemporal filtering scheme and robust Lower-Upper-Middle (LUM) based noise detector. It uses highly optimized bit-serial pipelined implementation in Altera...

Background: It has been shown that short-wavelength blue component of the visible light spectrum can alter the circadian rhythm and suppress the level of melatonin hormone. The short-wavelength light emitted by smartphones’ screens can affect the sleep quality of the people who use these devices at night through suppression of melatonin.Objectives: In this study, we examined the effects of co...

THE use of vena caval filters has increased significantly since the introduction of percutaneous placement techniques and the development of reduced-profile devices. The literature contains hundreds of reports of immediate and long-term outcomes for patients who have had these devices placed but the reports do not employ consistent standards, definitions, or techniques, making it difficult to c...

In this review paper we showcase recent activities on silicon photonics science and technology research in Hong Kong regarding two important topical areas — microresonator devices and optical nonlinearities. Our work on silicon microresonator filters, switches and modulators have shown promise for the nascent development of on-chip optoelectronic signal processing systems, while our studies on ...