• Title/Summary/Keyword: processing aid

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Side lobe free medical ultrasonic imaging with application to assessing side lobe suppression filter

  • Jeong, Mok Kun;Kwon, Sung Jae
    • Biomedical Engineering Letters
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    • v.8 no.4
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    • pp.355-364
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    • 2018
  • When focusing using an ultrasonic transducer array, a main lobe is formed in the focal region of an ultrasound field, but side lobes also arise around the focal region due to the leakage. Since the side lobes cannot be completely eliminated in the focusing process, they are responsible for subsequent ultrasound image quality degradation. To improve ultrasound image quality, a signal processing strategy to reduce side lobes is definitely in demand. To this end, quantitative determination of main and side lobes is necessary. We propose a theoretically and actually error-free method of exactly discriminating and separately computing the main lobe and side lobe parts in ultrasound image by computer simulation. We refer to images constructed using the main and side lobe signals as the main and side lobe images, respectively. Since the main and side lobe images exactly represent their main and side lobe components, respectively, they can be used to evaluate ultrasound image quality. Defining the average brightness of the main and side lobe images, the conventional to side lobe image ratio, and the main to side lobe image ratio as image quality metrics, we can evaluate image characteristics in speckle images. The proposed method is also applied in assessing the performance of side lobe suppression filtering. We show that the proposed method may greatly aid in the evaluation of medical ultrasonic images using computer simulations, albeit lacking the use of actual experimental data.

Implementation of Real-time Stereo Frequency Demodulator Using RTL-SDR (RTL-SDR을 이용한 스테레오 주파수 변조 방송의 실시간 수신기 구현)

  • Kim, Young-Ju
    • Journal of Broadcast Engineering
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    • v.24 no.3
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    • pp.485-494
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    • 2019
  • A software-driven real-time frequency de-modulator is implemented with the aid of universal-serial-bus (USB) type software defined radio dongle. An analog stereo frequency modulation (FM) broadcast signal is down-converted to the basedband analog signal then converted to digital bit streams in the USB dongle. Computer software such as Matlab, Python, and GNU Radio manipulates the incoming bit streams with the technique of digital signal processing. Low pass filtering, band pass filtering, decimation, frequency discriminator, double sideband amplitude demodulation, phase locked loop, and deemphasis function blocks are implemented using such computer languages. Especially, GNU Radion is employed to realize the real-time demodulator.

Characterizing Organelles in Live Stem Cells Using Label-Free Optical Diffraction Tomography

  • Kim, Youngkyu;Kim, Tae-Keun;Shin, Yeonhee;Tak, Eunyoung;Song, Gi-Won;Oh, Yeon-Mok;Kim, Jun Ki;Pack, Chan-Gi
    • Molecules and Cells
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    • v.44 no.11
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    • pp.851-860
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    • 2021
  • Label-free optical diffraction tomography (ODT), an imaging technology that does not require fluorescent labeling or other pre-processing, can overcome the limitations of conventional cell imaging technologies, such as fluorescence and electron microscopy. In this study, we used ODT to characterize the cellular organelles of three different stem cells-namely, human liver derived stem cell, human umbilical cord matrix derived mesenchymal stem cell, and human induced pluripotent stem cell-based on their refractive index and volume of organelles. The physical property of each stem cell was compared with that of fibroblast. Based on our findings, the characteristic physical properties of specific stem cells can be quantitatively distinguished based on their refractive index and volume of cellular organelles. Altogether, the method employed herein could aid in the distinction of living stem cells from normal cells without the use of fluorescence or specific biomarkers.

Experimental Test and Performance Evaluation of Mid-Range Automotive Radar Systems Using 2D FFT ROI (2D FFT ROI를 이용한 중단거리 차량용 레이더의성능 시험 및 평가)

  • Jonghun, Lee;Youngseok, Jin;Seoungeon, Song;Seokjun, Ko
    • Journal of Korea Society of Industrial Information Systems
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    • v.28 no.1
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    • pp.1-8
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    • 2023
  • In this paper, we developed a mid-range automotive radar systems based on the performance requirements and test procedures of the intelligent transport systems, that is lane change decision aid systems (LCDAS). The mid-range automotive radar has the maximum detection range up to 80m and an update time within 50ms. The computational loads of a signal processing were reduced by using ROI preprocessing technique. Considering actual driving environments, radar performance evaluations were conducted in two driving scenarios at an automotive proving ground.

High Throughput Multiplier Architecture for Elliptic Cryptographic Applications

  • Swetha, Gutti Naga;Sandi, Anuradha M.
    • International Journal of Computer Science & Network Security
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    • v.22 no.9
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    • pp.414-426
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    • 2022
  • Elliptic Curve Cryptography (ECC) is one of the finest cryptographic technique of recent time due to its lower key length and satisfactory performance with different hardware structures. In this paper, a High Throughput Multiplier architecture is introduced for Elliptic Cryptographic applications based on concurrent computations. With the aid of the concurrent computing approach, the High Throughput Concurrent Computation (HTCC) technology that was just presented improves the processing speed as well as the overall efficiency of the point-multiplier architecture. Here, first and second distinct group operation of point multiplier are combined together and synthesised concurrently. The synthesis of proposed HTCC technique is performed in Xilinx Virtex - 5 and Xilinx Virtex - 7 of Field-programmable gate array (FPGA) family. In terms of slices, flip flops, time delay, maximum frequency, and efficiency, the advantages of the proposed HTCC point multiplier architecture are outlined, and a comparison of these advantages with those of existing state-of-the-art point multiplier approaches is provided over GF(2163), GF(2233) and GF(2283). The efficiency using proposed HTCC technique is enhanced by 30.22% and 75.31% for Xilinx Virtex-5 and by 25.13% and 47.75% for Xilinx Virtex-7 in comparison according to the LC design as well as the LL design, in their respective fashions. The experimental results for Virtex - 5 and Virtex - 7 over GF(2233) and GF(2283)are also very satisfactory.

Comparison of alarm systems for advanced control room

  • Lee, H.C.;Oh, I.S.;Sim, B.S.;Koo, I.S.;Kim, J.T.;Lee, K.Y.;Park, J.K
    • Proceedings of the ESK Conference
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    • 1997.10a
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    • pp.303-309
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    • 1997
  • This study is carried out to investigate performance differences between two alarm presentation methods from the viewpoint of human factors and to provide items to be improved. One of the alarm display methods considered in this study displays alarm lists on VDT combined with hardwired alarm panels. The other method displays alarms on plant mimic diagrams of VDT. This alarm display method has other features for operator aid with which operator can get detailed information on the activated alarm in the mimic diagrams, and the capability for alarm processing such as alarm reduction and prioritization. To compare the twodisplay methods, a human factor experiment was performed with a plant simulator in the ITF(Integrated Test Fcility) that plant operators run for 4 event scenarios. During the experiment, physiological measurements, system and operator action log, and audio/video recordings were collected. Operators' subjective opinion was collected as well after the experiment. Time, error rate and situation awareness were major human factor criteria used for the comparison during the analysis stage of the experiment. No statistical significance was found in the results of our statistical comparison analysis. Several findings were identified, however, through the analysis of subjective opinions.

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Methods for improving meat protein digestibility in older adults

  • Seung Yun Lee;Ji Hyeop Kang;Da Young Lee;Jae Won Jeong;Jae Hyeon Kim;Sung Sil Moon;Sun Jin Hur
    • Journal of Animal Science and Technology
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    • v.65 no.1
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    • pp.32-56
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    • 2023
  • This review explores the factors that improve meat protein digestibility and applies the findings to the development of home meal replacements with improved protein digestion rates in older adults. Various methods improve the digestion rate of proteins, such as heat, ultrasound, high pressure, or pulse electric field. In addition, probiotics aid in protein digestion by improving the function of digestive organs and secreting enzymes. Plant-derived proteases, such as papain, bromelain, ficin, actinidin, or zingibain, can also improve the protein digestion rate; however, the digestion rate is dependent on the plant enzyme used and protein characteristics. Sous vide processing improves the rate and extent of protein digestibility, but the protein digestion rate decreases with increasing temperature and heating time. Ultrasound, high pressure, or pulsed electric field treatments degrade the protein structure and increase the proteolytic enzyme contact area to improve the protein digestion rate.

Retrieval methodology for similar NPP LCO cases based on domain specific NLP

  • No Kyu Seong ;Jae Hee Lee ;Jong Beom Lee;Poong Hyun Seong
    • Nuclear Engineering and Technology
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    • v.55 no.2
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    • pp.421-431
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    • 2023
  • Nuclear power plants (NPPs) have technical specifications (Tech Specs) to ensure that the equipment and key operating parameters necessary for the safe operation of the power plant are maintained within limiting conditions for operation (LCO) determined by a safety analysis. The LCO of Tech Specs that identify the lowest functional capability of equipment required for safe operation for a facility must be complied for the safe operation of NPP. There have been previous studies to aid in compliance with LCO relevant to rule-based expert systems; however, there is an obvious limit to expert systems for implementing the rules for many situations related to LCO. Therefore, in this study, we present a retrieval methodology for similar LCO cases in determining whether LCO is met or not met. To reflect the natural language processing of NPP features, a domain dictionary was built, and the optimal term frequency-inverse document frequency variant was selected. The retrieval performance was improved by adding a Boolean retrieval model based on terms related to the LCO in addition to the vector space model. The developed domain dictionary and retrieval methodology are expected to be exceedingly useful in determining whether LCO is met.

Processing Optimization of Chocolate with Fermented and Aged Garlic Extract (발효숙성마늘 추출물 첨가 초콜릿 제조 조건의 최적화)

  • Shin, Ji-Hun;Joo, Na-Mi
    • Journal of the Korean Society of Food Culture
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    • v.25 no.2
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    • pp.216-224
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    • 2010
  • This study was conducted to aid in the development of the optimal recipe for chocolate with fermented and aged garlic extract (Allium sativum var. pekinense). We added garlic extract in order to increase the nutritional value of the chocolate. The optimal sensory composite recipe was determined, following Central Composites for chocolate with different levels of fermented and aged garlic extract (A) and cream (B), while analysis was performed by Response Surface Methodology, from the date that the sensory evaluation was performed. Ten experimental recipes, including 2 reference points in the composition, were selected. The compositional and functional properties were measured, and physical and sensory values were applied to the mathematical models. Perturbation plots showed the influence of each ingredient on the final product. Measurements showed significant values in lightness, sweetness, pH, hardness and cohesiveness, while sensory measurements showed significant values in color, texture, sourness, bitterness and overall quality. The optimum formulations were calculated by numerical and graphical methods, as being 34.61g fermented and aged garlic extract and 72.68g cream for each 200g chocolate. As well it was revealed that the aptitude of chocolate was more influenced by fermented garlic extract than it was by cream.

Globalization of Korean Cuisine through the Korean Food Items Promotion -Focus on Marketing Strategy of Korean Food Items- (한식 식자재 프로모션을 통한 한국음식의 세계화 방안 -한식 식자재 마케팅 전략을 중심으로-)

  • Lee, Eun-Jung;Kim, Tae-Hee;Kim, Doo-Ra
    • Journal of the Korean Society of Food Culture
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    • v.23 no.6
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    • pp.729-736
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    • 2008
  • The study sought ways to promote the global recognition of Korean food items. The Korean cuisine is one of the healthiest and well-balanced in the world. But, in contrast to countries including the United States, France, China, Japan, Thailand and Australia that have adopted food promotion and marketing strategies, Korea lacks a similar strategy. Development of indigenous sauces by Korean food manufacturers and processors is one route in the promotion of Korean cuisine. Korean restaurant franchising could also aid in export of Korean food items. The food manufacturing/processing sectors must work in concert with the Korean government to globalize the Korean cuisine. Brand chefs, Korean cuisine seminars and promotional efforts in foreign countries and foreign cooking schools (such as the 'Taste Korea' campaign) are prudent actions.