• 센서학회지
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• 제28권2호
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• pp.106-112
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• 2019

Flexible impact force sensors composed of piezoelectric PZT/PDMS composite sandwiched between Al/PET films were fabricated and their voltage signal characteristics were evaluated under varying impact forces for electronic mitt applications. The piezoelectric impact force sensor on an ethylene-vinyl acetate (EVA) substrate exhibited an output voltage difference of no greater than 40 mV a periodical impact test in with the impact load was increased by as much as 240 N by a restoration time of 5 s in a five-time experiment, implying good sensing ability. Moreover, the impact force sensor embedded four electronic mitts showed a reliable sensitivity of less than 1 mV/N and good repeatability under 100 N-impact force during a cycle test executed 10,000 times. This indicated that the fabricated flexible piezoelectric impact sensor could be used in electronic mitt applications. However, the relatively low elastic limit of substrate material such as EVA or poly-urethane slightly deteriorated the sensitivity of the impact sensor embedded electronic mitt at over 200 N-impact forces.

• 정보보호학회논문지
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• 제9권4호
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• pp.85-97
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• 1999

은닉 서명 방식은 검증가가 보낸 메시지를 서명자가 그메시지 내용을 보지 못한 채 서명자로부 터 메시지 m에 대한 유효한 서명을 받도록 하는 프로토콜을 말한다. 이것은 만약 은행이 상점과 결탁하 더라도 동전에 대한 사용자를 추적할수 없다는 것을 의미한다. 그러나 사용자의 익명성이 보장되는 전 자화폐는 또한 돈세탁 돈 약탈 그리고 불법적인 구매 행위와 같은 각종 범죄행동을 용이하 게 한다. 이 에 본 논문에서는 국내 전자서명 표준인 KCDSA에 기반하여 공정한 은닉서명을 제안하고 이를 전자화 폐를 부정한 수단으로 이용한 사용자를 추적할수 있는 익명성 제어 기능을 가지고 있다. A blind signature scheme is a protocol allowing verifier to obtain a valid signature for a message m from a signer without him seeing the message. This means that the bank in collaboration with the shop cannot trace the electronic cash to user. However anonymous electronic cash also facilitates fraud and criminal acts such as money laundering anonymous blackmailing and illegal purchaes. Therefore in this paper we propose fair blind signature scheme based on KCDSA which is a domestic digital signature scheme and it apply a electronic cash system. In particularly a proposed electronic cash system have an anonymity control ability which trace a user who make use a electronic cash illegally in association with a trusted center.

• 한국전기전자재료학회논문지
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• 제35권1호
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• pp.86-92
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• 2022

Despite otherwise advantageous properties, the performance and reliability of devices manufactured in β-Ga₂O₃ on semi-insulating Ga₂O₃ substrates may degrade because of poorly mitigated self-heating, which results from the low thermal conductivity of Ga₂O₃ substrates. In this work, we investigate and compare self-heating and device performance of β-Ga₂O₃ MESFETs on substrates of semi-insulating Ga₂O₃ and 4H-SiC. Electron mobility in β-Ga₂O₃ is negatively affected by increasing lattice temperature, which consequently also negatively influences device conductance. The superior thermal conductivity of 4H-SiC substrates resulted in reduced β-Ga₂O₃ lattice temperatures and, thus, mitigates MESFET drain current degradation. This, in turn, allows practically reduced device dimensions without deteriorating the performance and improved device reliability.

• 시큐리티연구
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• 제36호
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• pp.111-137
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• 2013

이 연구는 기계경비서비스품질이 기계경비고객만족이 고객충성도에 미치는 영향과 전환장벽이 고객충성도에 미치는 영향을 규명하는데 있으며, 조사대상자는 현재 C, S, N, T업체의 기계경비를 이용하고 있는 사업장의 업주들 560명을 대상으로 설문지를 배포하여 조사하였다. 본 연구에서 실증 분석된 연구가설의 결과를 요약하고 고객 전략적 측면에서 시사점을 제시하면 다음과 같다. 첫째, 성별에 따라 기계경비만족도가 대안의 매력에 미치는 영향과 인간관계가 고객충성도에 미치는 영향은 남, 여 간의 차이가 나타났으며, 이용기간 및 연령대에 따라 기계경비서비스품질만족도와 대안의 매력은 차이가 있는 것으로 나타났다. 둘째, 기계경비서비스품질만족도가 높을수록 기계경비고객만족도, 전환비용 및 인간관계에 정적(+)인 영향을 미치는 것으로 나타났다. 셋째, 기계경비고객만족도가 높을수록 전환비용, 인간관계 및 고객충성도에 정적(+)인 영향을 미치는 것으로 나타났다. 넷째, 전환비용이 고객충성도에 미치는 영향에서 전환비용이 높을수록 고객충성도에 정적(+)인 영향을 미치는 것으로 나타났으나, 인간관계 및 대안에 매력에는 유의한 관계가 없는 것으로 나타났다. 이상의 연구결과를 종합해 보면 기계경비이용자들이 기계경비서비스품질만족과 기계경비고객만족도에 대한 인식을 높게 하고 이러한 높은 인식이 전환장벽을 구축하여 높은 고객충성도를 높일 수 있다는 결론을 얻었다. 따라서 기존고객들에 대한 철저한 고객관리와 함께 기계경비서비스품질과 기계경비고객만족도, 전환비용에 대한 투자와 노력이 핵심전략임을 제시할 수 있다. 성공적인 경영을 위해서는 고차원적인 기계경비서비스 품질만족도와 장기고객에게 다양한 고객기반 강화프로그램을 마련하여 고객들에게 실질적인 가치와 편익을 제공함과 동시에 가격적으로 탄력적인 자세를 취하여 높은 전환비용을 마련하여 고객들이 차별화를 직접적으로 지각할 수 있는 각종 커뮤니케이션과 홍보채널을 마련한다면 충성도가 높은 고객집단을 개발하고 유지할 수 있을 것이다.

• 기본간호학회지
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• 제9권1호
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• pp.101-112
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• 2002

Purpose: This study evaluated the accuracy of electronic devices compared with mercury sphygmomanometer. Of 132 outpatients with electronic devices. 77 who possessed oscillometric cuff devices participated in this study. Method: When the blood pressure was measured, all electronic devices were connected by means of a Y-connector to a mercury sphygmomanometer. Using the simultaneous same arm approach, each comparison was carried out three times at 2-minute intervals. Results: Compared with the mercury sphygmomanometer, the electronic devices underestimated systolic and diastolic blood pressure, respectively by $4.0{\pm}5.8mmHg$ and $2.5{\pm}67mmHg$, which satisfies the standard error range of the American Association for the Advancement of Medical Instrumentation. According to the British Hypertension Society criteria, these differences achieved C grade for both systolic and diastolic pressure. For the graphical analysis, the differences had a tendency to fulfill the permitted error limits in both diastolic and systolic blood pressure. Moreover, the purchase duration was not correlated with the accuracy of electronic devices. Conclusion: These results indicate that difference in blood pressure between electronic devices and mercury sphygmomanometer is within the standard error. Therefore, electronic blood pressure measuring devices may be useful for therapeutic self-management of hypertension.

• Journal of Information Display
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• 제2권3호
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• pp.60-65
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• 2001

Lateral type poly-silicon field emitters were fabricated by utilizing the LOCOS (Local Oxidation of Silicon) process. For the implementation 'of an ideal field emission device with quasi-zero tunneling barrier, a new and fundamental approach has used conducted by introducing an intelligent carbon-based thin layer on the cathode tip surface via a field-assisted self-aligning of carbon (FASAC) process. Fundamental lowering of the turn-on field for the electron emission was feasible through the control of both the tip shape and surface barrier height.

• 한국전자거래학회지
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• 제8권3호
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• pp.219-239
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• 2003

전자상거래 요소기술들에 기반 한 글로벌 디지털 경제가 급속하게 확산되고 있다. 본 연구에서는 전자상거래에 관련된 주요요소기술들을 체계적으로 분류하기 위한 전자상거래 기술분류 모형을 개발하였다. 또한 본 연구에서는 전자상거래 기술분류 모형이 어떻게 활용될 수 있는 지에 대한 구체적인 방안도 제시하였다. 본 논문에서 제시한 전자상거래 기술분류 모형은 전자상거래에 관련된 주요 요소기술 상호간의 연관관계나 응용에 대한 체계적인 분석이 가능하며 향후 전자상거래와 디지털 경제에 관련된 연구의 주요한 지침으로 활용될 수 있을 것이다.

• 한국전기전자재료학회논문지
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• 제33권1호
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• pp.31-36
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• 2020

An investigation was conducted to determine whether the ratio of the fluid to the charged particles affects the panel reflexibility rate and the drifting current flowing in the panel, in electrophoretic-based electronic paper. In this regard, three panels were produced in this study with the ratio of the charged particles to the fluid set as 1:5, 1:1, and 5:1. Each sample was driven using an identical input pulse, for which the current flowing in the panel and the output voltage of the photodiode were measured for the panel reflexibility rate. Consequently, the drifting current initially exhibited a peak value and a saturated value at a later point. This value was proportional to the ratio of the charged particles, and it was similar to this ratio when it is higher than 1:1. The output voltage of the photodiode due to the panel reflexibility rate was proportional to the ratio of the charged particles. However, the response speed decreased if the ratio was higher than 1:1. It is expected that the results of this study will contribute to the analysis of the charging of charged particles in electrophoretic-based electronic paper, and the selection of an appropriate concentration.

• International Journal of Knowledge Content Development & Technology
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• 제7권4호
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• pp.51-69
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• 2017

Availability, awareness and use of electronic resources provide access to authoritative, reliable, accurate and timely access to information. The use of electronic information resources (EIRs) can enable innovation in teaching and increase timeliness in research of postgraduate students which will eventual result into encouragement of the expected research-led enquiry in this digital age. The study adopted a descriptive survey design. Samples of 300 of postgraduate students within seven out 13 Faculties were randomly selected. Data were collected using questionnaire designed to elicit response from respondents and data were analyzed using descriptive statistics methods percentages, mean, and standard deviation. Results indicated that internet was ranked most available and used in the university. Low level of usage of electronic resources, in particular, full texts data bases is linked to a number of constraints: Interrupted power supply was ranked highest among other factors as speed and capacity of computers, retrieval of records with high recall and low precision, retrieving records relevant to information need, lack of knowledge of search techniques to retrieve information effectively, non possession of requisite IT skills and problems accessing the internet. The study recommended that usage of electronic resources be made compulsory, intensifying awareness campaigns concerning the availability, training on use of electronic resources and the problem of power outage be addressed.

• 센서학회지
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• 제16권2호
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• pp.150-158
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• 2007

The IEEE 1451 publication are available, this standard defines interface between sensor and processor, and plug and play in processor is possible. Also, Intelligence of sensor was possible because sensor includes transducer electronic data sheet (TEDS). In IEEE 1451 standards, IEEE 1451.4 is suitable standard in single sensor, and IEEE 1451.2 is suitable standard in multi-sensors (array sensor). In this paper, apply IEEE 1451 to electronic tongue system. In the case of electronic tongue system, because array sensor is used, it is that complex and difficult to apply IEEE 1451.4 that is standard for single sensor. In this paper, apply IEEE 1451.2 for array sensor to design of electronic tongue system. Communication interface method of IEEE 1451.2 for electronic tongue system is presented, and implemented TEDS of electronic tongue system.