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JOURNAL OF SENSOR SCIENCE AND TECHNOLOGY

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수록정보
수록범위 : 1권1호(1992)~31권5호(2022) |수록논문 수 : 1,948
센서학회지
31권5호(2022년 09월) 수록논문
최근 권호 논문
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KCI후보

저자 : Sang-mi Chang , Chong-yun Kang , Sunghoon Hur

발행기관 : 한국센서학회 간행물 : 센서학회지 31권 5호 발행 연도 : 2022 페이지 : pp. 279-285 (7 pages)

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Recently, 3D printing technology has gained increased attention in the manufacturing industry because it allows the manufacturing of complex but sophisticated structures as well as moderate production speed. Owing to advantages of 3D printers, such as flexible design, customization, rapid prototyping, and ease of access, can also be advantageous to sensor developments, 3D printing demands have increased in various active device fields, including sensor manufacturing. In particular, 3D printing technology is of significant interest in tactile sensor development where piezoelectric materials are typically embedded to acquire voltage signals from external stimuli. In regard with piezoelectricity, researchers have worked with various piezoelectric materials to achieve high piezoelectric response, but the structural approach is limited because ceramics have been regarded as challenging materials for complex design owing to their limited manufacturing methods. If appropriate piezoelectric materials and approaches to design are used, sensors can be fabricated with the improved piezoelectric response and high sensitivity that cannot be found in common bulk materials. In this study, various 3D printing technologies, material combinations, and applications of various piezoelectric sensors using the 3D printing method are reviewed.

KCI후보

저자 : Soo Young Jung , Jin Soo Park , Min-seok Kim , Ho Won Jang , Byung Chul Lee , Seung-hyub Baek

발행기관 : 한국센서학회 간행물 : 센서학회지 31권 5호 발행 연도 : 2022 페이지 : pp. 286-292 (7 pages)

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As mobile electronics become smarter, higher-level security systems are necessary to protect private information and property from hackers. For this, biometric authentication systems have been widely studied, where the recognition of unique biological traits of an individual, such as the face, iris, fingerprint, and voice, is required to operate the device. Among them, ultrasound fingerprint imaging technology using piezoelectric materials is one of the most promising approaches adopted by Samsung Galaxy smartphones. In this review, we summarize the recent progress on piezoelectric ultrasound micro-electro-mechanical systems (MEMS) transducers with various piezoelectric materials and provide insights to achieve the highest-level biometric authentication system for mobile electronics.

KCI후보

저자 : Najaf Rubab , Sang-woo Kim

발행기관 : 한국센서학회 간행물 : 센서학회지 31권 5호 발행 연도 : 2022 페이지 : pp. 293-300 (8 pages)

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Flexible, wearable, and implantable electronic sensors have started to gain popularity in improving the quality of life of sick and healthy people, shifting the future paradigm with high sensitivity. However, conventional technologies with a limited lifespan occasionally limit their continued usage, resulting in a high cost. In addition, traditional battery technologies with a short lifespan frequently limit operation, resulting in a substantial challenge to their growth. Subsequently, utilizing human biomechanical energy is extensively preferred motion for biologically integrated, self-powered, functioning devices. Ideally suited for this purpose are piezoelectric energy harvesters. To convert mechanical energy into electrical energy, devices must be mechanically flexible and stretchable to implant or attach to the highly deformable tissues of the body. A systematic analysis of piezoelectric nanogenerators (PENGs) for personalized healthcare is provided in this article. This article briefly overviews PENGs as self-powered sensor devices for energy harvesting, sensing, physiological motion, and healthcare.

KCI후보

저자 : Jiwon Park , Joonchul Shin , Sunghoon Hur , Chong-yun Kang , Kyung-hoon Cho , Hyun-cheol Song

발행기관 : 한국센서학회 간행물 : 센서학회지 31권 5호 발행 연도 : 2022 페이지 : pp. 301-306 (6 pages)

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With the recent widespread implementation of Internet of Things (IoT) technology driven by Industry 4.0, self-powered sensors for wearable and implantable systems are increasingly gaining attention. Piezoelectric nanogenerators (PENGs) and triboelectric nanogenerators (TENGs), which convert biomechanical energy into electrical energy, can be considered as efficient self-powered sensor platforms. These are energy harvesters that are used as low-power energy sources. However, they can also be used as sensors when an output signal is used to sense any mechanical stimuli. For sensors, collecting high-quality data is important. However, the accuracy of sensing for practical applications is equally important. This paper provides a brief review of the performance advanced by the materials and structures of the latest PENG/TENG-based wearable sensors and intelligent applications applied using artificial intelligence (AI).

KCI후보

저자 : 김정현 ( Jeong Hyeon Kim ) , 김현승 ( Hyunseung Kim ) , 정창규 ( Chang Kyu Jeong ) , 이한얼 ( Han Eol Lee )

발행기관 : 한국센서학회 간행물 : 센서학회지 31권 5호 발행 연도 : 2022 페이지 : pp. 307-311 (5 pages)

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With the development of Internet of Things (IoT) technologies, numerous people worldwide connect with various electronic devices via Human-Machine Interfaces (HMIs). Considering that HMIs are a new concept of dynamic interactions, wearable electronics have been highlighted owing to their lightweight, flexibility, stretchability, and attachability. In particular, wearable strain sensors have been applied to a multitude of practical applications (e.g., fitness and healthcare) by conformally attaching such devices to the human skin. However, the stretchable elastomer in a wearable sensor has an intrinsic stretching limitation; therefore, structural advances of wearable sensors are required to develop practical applications of wearable sensors. In this study, we demonstrated a 3-dimensional (3D), porous, and piezoelectric strain sensor for sensing body movements. More specifically, the device was fabricated by mixing polydimethylsiloxane (PDMS) and polyvinylidene fluoride nanoparticles (PVDF NPs) as the matrix and piezoelectric materials of the strain sensor. The porous structure of the strain sensor was formed by a sugar cube-based 3D template. Additionally, mixing methods of PVDF piezoelectric NPs were optimized to enhance the device sensitivity. Finally, it is verified that the developed strain sensor could be directly attached onto the finger joint to sense its movements.

KCI후보

저자 : 배준호 ( Jun Ho Bae ) , 함성수 ( Seong Su Ham ) , 박성철 ( Sung Cheol Park ) , 박귀일 ( Kwi-il Park )

발행기관 : 한국센서학회 간행물 : 센서학회지 31권 5호 발행 연도 : 2022 페이지 : pp. 312-317 (6 pages)

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Piezoelectric energy harvesting has attracted increasing attention over the last decade as a means for generating sustainable and long-lasting energy from wasted mechanical energy. To develop self-powered wearable devices, piezoelectric materials should be flexible, stretchable, and bio-eco-friendly. This study proposed the fabrication of stretchable piezoelectric composites via dispersing perovskite-structured BaTiO3 nanoparticles inside an Ecoflex polymeric matrix. In particular, the stretchable piezoelectric sensor array was fabricated via a simple and cost-effective spin-coating process by exploiting the piezoelectric composite comprising of BaTiO3 nanoparticles, Ecoflex matrix, and stretchable Ag coated textile electrodes. The fabricated sensor generated an output voltage of ~4.3 V under repeated compressing deformations. Moreover, the piezoelectric sensor array exhibited robust mechanical stability during mechanical pushing of ~5,000 cycles. Finite element method with multiphysics COMSOL simulation program was employed to support the experimental output performance of the fabricated device. Finally, the stretchable piezoelectric sensor array can be used as a self-powered touch sensor that can effectively detect and distinguish mechanical stimuli, such as pressing by a human finger. The fabricated sensor demonstrated potential to be used in a stretchable, lead-free, and scalable piezoelectric sensor array.

KCI후보

저자 : 이동건 ( Dong Geon Lee ) , 이한욱 ( Han Uk Lee ) , 임원빈 ( Won Bin Im ) , 고현석 ( Hyunseok Ko ) , 조성범 ( Sung Beom Cho )

발행기관 : 한국센서학회 간행물 : 센서학회지 31권 5호 발행 연도 : 2022 페이지 : pp. 318-323 (6 pages)

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Barium titanate (BaTiO3) is considered to be a beneficial ceramic material for multilayer ceramic capacitor (MLCC) applications because of its high dielectric constant and low dielectric loss. Numerous attempts have been made to improve the physical properties of BaTiO3 in response to recent market trends by employing multicomponent alloying strategies. However, owing to its significant number of atomic combinations and unpredictable physical properties, finding a traditional experimental approach to develop multicomponent systems is difficult; the development of such systems is also time-consuming. In this study, 168 new structures were fabricated using special quasi-random structures (SQSs) of Ba1-xCaxTi1-yZryO3, and 1680 physical properties were extracted from first-principles calculations. In addition, we built an integrated database to manage the computational results, and will provide big data solutions by performing data analysis combined with AI modeling. We believe that our research will enable the global materials market to realize digital transformation through datalization and intelligence of the material development process.

KCI후보

저자 : 신덕식 ( Duck-shick Shin ) , 박준헌 ( Jun-heon Park ) , 임영철 ( Young-cheol Lim ) , 최준호 ( Joon-ho Choi )

발행기관 : 한국센서학회 간행물 : 센서학회지 31권 5호 발행 연도 : 2022 페이지 : pp. 324-329 (6 pages)

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This paper proposes a shift-register-based multichannel ultrasonic focusing delay control method using a complex programmable logic device (CPLD) for a high resolution of ultrasonic focusing system. The proposed method can achieve the ultrasonic focusing through the delay control of driving signals of each ultrasonic transducer of an ultrasonic array. The delay of the driving signals of all ultrasonic channels can be controlled by setting the shift register in the CPLD. The experiment verified that the frequency of the clock used for the delay control increased, the error of the focusing point decreased, and the diameter of the focusing point decreased as the length of the shift register in the proposed method. The proposed method used only one CPLD for ultrasonic focusing and did not require to use complex hardware circuits. Therefore, the resources required for the design of an ultrasonic focusing system could be reduced. The proposed method can be applied to the fields of human computer interaction (HCI), virtual reality (VR) and augmented reality (AR).

KCI후보

저자 : 김재선 ( Jason Kim ) , 이인규 ( Ingyu Lee ) , 배기웅 ( Ki-woong Bae ) , 유선철 ( Son-cheol Yu )

발행기관 : 한국센서학회 간행물 : 센서학회지 31권 5호 발행 연도 : 2022 페이지 : pp. 330-336 (7 pages)

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This paper proposes a method to calibrate the electrode misplacement in underwater electric field sensor arrays (EFSAs) for accurate measurements of underwater electric field signatures. The electrode misplacement of an EFSA was estimated by measuring the electric field signatures generated by a known electric source and by comparing the measurements with the theoretical calculations under similar measurement conditions. When the EFSA measured the electric field signatures induced by an unknown electric source, the electric properties of the unknown electric source were approximated by considering the optimized estimation of the electrode misplacement of the EFSA. Finally, the measured electric field signatures were calibrated by calculating the theoretical electric field signatures to be measured with an ideally installed EFSA without electrode misplacement; the approximated electric properties of the unknown electric source were also taken into account. Simulations were conducted to test the proposed calibration method. The results showed that the electrode misplacement could be estimated. Further, the electric field measurements and the electric field-based localization of underwater vessels became more accurate after the application of the proposed calibration method. The proposed method will contribute to applications such as the detection and localization of underwater electric sources, which require accurate measurements of underwater electric field signatures.

KCI후보

저자 : 양이준 ( Yijun Yang ) , 맹보희 ( Bohee Maeng ) , 정동건 ( Dong Geon Jung ) , 이준엽 ( Junyeop Lee ) , 김영삼 ( Yeongsam Kim ) , 안희경 ( Hee Kyung An ) , 정대웅 ( Daewoong Jung )

발행기관 : 한국센서학회 간행물 : 센서학회지 31권 5호 발행 연도 : 2022 페이지 : pp. 337-342 (6 pages)

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Hydrogen (H2) gas is widely preferred for use as a renewable energy source owing to its characteristics such as environmental friendliness and a high energy density. However, H2 can easily reverse or explode due to minor external factors. Therefore, H2 gas monitoring is crucial, especially when the H2 concentration is close to the lower explosive limit. In this study, metal oxide materials and their pn heterojunctions were synthesized by a hydrothermal-assisted dip-coating method. The synthesized thin films were used as sensing materials for H2 gas. When the H2 concentration was varied, all metal oxide materials exhibited different gas sensitivities. The performance of the metal oxide gas sensor was analyzed to identify parameters that could improve the performance, such as the choice of the metal oxide material, effect of the p-n heterojunctions, and operating temperature conditions of the gas sensor. The experimental results demonstrated that a CuO/ZnO gas sensor with a p-n heterojunction exhibited a high sensitivity and fast response time (134.9% and 8 s, respectively) to 5% H2 gas at an operating temperature of 300℃.

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