• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.17 no.1
• /
• pp.33-39
• /
• 2007

Finite field multipliers are the basic building blocks in many applications such as error-control coding, cryptography and digital signal processing. Hence, the design of efficient dedicated finite field multiplier architectures can lead to dramatic improvement on the overall system performance. In this paper, a new bit serial structure for a multiplier with low latency in Galois field is presented. To speed up multiplication processing, we divide the product polynomial into several parts and then process them in parallel. The proposed multiplier operates standard basis of $GF(2^m)$ and is faster than bit serial ones but with lower area complexity than bit parallel ones. The most significant feature of the proposed architecture is that a trade-off between hardware complexity and delay time can be achieved.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.21 no.4
• /
• pp.123-127
• /
• 2021

Millimeter-wave tracking radars should be operated in various environmental restrictions, thus they demand more computing power and smaller size compared to conventional tracking radars. This paper presents the design and implementation of the compact power supply for millimeter-wave tracking radar applications. To meet requirements of low voltage/high current and voltage accuracy for FPGA/DSP digital circuits, Point of Load (POL) converters are used in order to enhance power density and system efficiency. LDO (Low Dropout) is applied for the output voltage under the light load condition, then the single-input-multi-output power supply with max power of 375 W and 8 outputs is developed. The proposed power supply achieves output voltage accuracy of ±2 % and noise level of <50 mVpp % under full load conditions.

• Journal of Digital Convergence
• /
• v.10 no.9
• /
• pp.409-416
• /
• 2012

This study aimed to compare the effectiveness of action-observational training and task-oriented training on upper limb function and activities of daily living in patients with post-stroke hemiparesis. This study included 12 voluntary participants with post-stroke hemiparesis. Subjects were randomly assigned to either group 1 or group 2, with 6 in each group. Each subject completed the crossover experiment that comprised of action-observational training (A) and task-oriented training (B). The intervention sequence was A-B for the group 1 and B-A for the group 2. Each training was performed for 30 min a day, 5 times a week for 2 weeks (total experimental period of 4 weeks). Assessments were made using the Wolf Motor Function Test (WMFT) and Modified Barthel Index (MBI) thrice: at baseline, after 2 weeks of intervention, and after 4 weeks of intervention. The results showed that the WMFT and MBI scores significantly improved after the completion of each training (p<.05). Therefore, a determination of the superior training method was difficult. The effect sizes of both groups were greater when performed the action-observational training. The findings suggest that both the action-observational training and task-oriented training may be helpful in improving the upper limb function and activities of daily living for patients with post-stroke hemiparesis, and support the clinical feasibility of the action-observational training.

• Journal of Digital Convergence
• /
• v.12 no.12
• /
• pp.469-475
• /
• 2014

This study analyzed the studies and their trends, specifically 124 master's and doctoral theses, as well as research papers on the topic of education on death published from 1990 to 2014. The study's findings are as follows. First, in terms of trends by year, there were only 8papers in the 1990s but this figure saw a dramatic jump from 2005 to 2009 to a total of 50papers(40.3%). The majority of them, 59papers in total, were master's theses(47.6%). Second, in terms of the study field, theological studies took the lead and studies on social welfare accounted for 29papers(28.4%) which was the largest share. Third, in terms of study subjects, senior citizens were used in the majority of papers or 35papers(40.7%) in total. Fourth, in terms of methodology, literature studies accounted for 61papers(49.2%) which was the largest share. Fifth, for mediation programs education on death, the preferred method of study was to have a before-after design using a control group and experiment group. The most common number of total sessions was 5-8sessions with one session per week and each session lasting for about 100-120minutes. Sixth, as for the effect variable of mediation programs for education on death, death anxiety was the most frequently studied variable at 23 papers(31.5%).

• Journal of the Institute of Electronics and Information Engineers
• /
• v.53 no.5
• /
• pp.152-159
• /
• 2016

This paper describes an offset and 1/f noise cancellation technique based hall sensor signal processor. The hall sensor outputs a hall voltage from the input magnetic field, which direction is orthogonal to hall plate. The two major elements to complete the hall sensor operation are: the one is a hall sensor to generate hall voltage from input magentic field, and the other one is a hall signal process system to cancel the offset and 1/f noise of hall signal. The proposed hall sensor splits the hall signal and unwanted signals(i.e. offset and 1/f noise) using a spinning current biasing technique and chopper stabilizer. The hall signal converted to 100 kHz and unwanted signals stay around DC frequency pass through chopper stabilizer. The unwanted signals are bloked by highpass filter which, 60 kHz cut off freqyency. Therefore only pure hall signal is enter the ADC(analog to dogital converter) for digitalize. The hall signal and unwanted signal at the output of an amplifer and highpass filter, which increase the power level of hall signal and cancel the unwanted signals are -53.9 dBm @ 100 kHz and -101.3 dBm @ 10 kHz. The ADC output of hall sensor signal process system has -5.0 dBm hall signal at 100 kHz frequency and -55.0 dBm unwanted signals at 10 kHz frequency.

• Journal of Digital Convergence
• /
• v.15 no.1
• /
• pp.277-285
• /
• 2017

The purpose of this study identified the effectiveness of the existent interventions, which had been applied to the teens in multicultural families in South Korea. Totally 29 relevant studies, including dissertations and published articles, published from 2008 to 2014, were systematically searched and analyzed through meta-analytic method. The study results revealed the specific conditions which made the intervention more effective for the teens in multicultural families. Specifically, the program could be most effective when the program had a social adaptation intervention type as well as aimed to middle school students as a target population. Also, the program could be most effective when the program had lower than 8 sessions, run 3-5 times a week, and had from 21 to 30 participants in one intervention group. In addition, current existing programs showed higher effect sizes on outcomes focusing on relationships rather than on those focusing on psychological problems. This study is theoretically meaningful in terms of quantitatively synthesizing the existing intervention programs for the teens in multicultural families. In addition, we expect that this study would practically contribute to develop evidence-based programs for those teens in multicultural families.

• Journal of rehabilitation welfare engineering & assistive technology
• /
• v.7 no.1
• /
• pp.51-58
• /
• 2013

As it is changing into aging society, rehabilitation, welfare and sports industry markets are being expanded fast. Especially, the field of vital signals interface to control welfare instruments like wheelchair, rehabilitation ones like an artificial arm and leg and general electronic ones is a new technology field in the future. Also, this technology can help not only the handicapped, the old and the weak and the rehabilitation patients but also the general public in various application field. The commercial bio-signal measurement instruments and interface systems are complicated, expensive and large-scaled. So, there are a lot of limitations for using in real life with ease. this thesis proposes a wireless transmission interface system that uses EMG(electromyogram) signals and a control module to manipulate hardware systems with portable size. We have designed a hardware module that receives the EMG signals occurring at the time of wrist movement and eliminated noises with filter and amplified the signals effectively. DSP(Digital Signal Processor) chip of TMS320F2808 which was supplied from TI company was used for converting into digital signals from measured EMG signals and digital filtering. We also have used PCA(Principal Component Analysis) technique and classified into four motions which have right, left, up and down direction. This data was transmitted by wireless module in order to display at PC monitor. As a result, the developed system obtains recognition success ratio above 85% for four different motions. If the recognition ratio will be increased with more experiments. this implemented system using EMG wrist direction signals could be used to control various hardware systems.

• Journal of Digital Convergence
• /
• v.15 no.2
• /
• pp.47-58
• /
• 2017

Career and academic Counseling is often viewed as the catalyst for frequent and consistent interaction with students, but it is more than simply advising students about which majors, universities or jobs to consider. Ongoing, personal contact of career and academic counselors with students is an essential component in long-term career-related efficacy. But statistics show that high schools in non-urban or rural areas face significant issues different from those schools in metropolitan or suburban contexts, failing to maintain the significant number of teachers enough for effective career and academic counseling. This article proposes an alternative model of career and academic counseling, provided by MBA(Master of Business Administration) alumni based social enterprise in Seoul. This service explores the skills, knowledge and capabilities which MBA alumni gained from their jobs and MBA programs within the context of a career-competency framework. This paper concludes with the social and educational aspect of this shared responsibility strategy that may enhance student motivation and persistence in non-urban high schools.

• Journal of Broadcast Engineering
• /
• v.10 no.3
• /
• pp.422-435
• /
• 2005

Compared with analog broadcasting, digital broadcasting supports technical background to provide personalize the TV watching environment by offering broadcasting services that can adapt to viewers' preferences. However, current digital broadcasting shows limited services such as reservation recording, simple program guiding with an electronic program guide (EPG) on a personal video recorder system, and primitive data broadcasting by broadcasters. Therefore, the purpose of this paper is to suggest a new broadcasting environment which gives a person facility and a difference fur watching TV by serving enhanced personalized services. For that reason, we propose an intelligent broadcasting system which can minimize viewer's actions, and enhanced broadcasting services which are based on understanding of the semantics of broadcasting contents. To implement the system, agent technology as well as the MPEG-7 and TV-Anytime Forum (TVAF) are employed. For content-level services, real-time content filtering and personalized video skimming are designed and implemented. To verify the usefulness of the proposed system, we demonstrate it with a test-bed on which content-level personalized services are implemented.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.30 no.2
• /
• pp.155-161
• /
• 2010

Recently, the electromagnetic techniques of the eddy current testing(ECT), alternating current field testing, magnetic flux leakage testing and remote field testing have been used as a nondestructive evaluation method based on the electromagnetic induction. The eddy current testing is now widely accepted as a NDE method for the heat exchanger tube in the electric power industry, chemical, shipbuilding, and military. The ECT system mainly consists of the synthesizer module, analog module, analog-to-digital converter, power supplier, and data acquisition and analysis program. In this study, the synthesizer module and the analog module which are essential to the ECT system were primarily developed. The developed ECT system is basically a multifrequency type which is able to inject the maximum four frequencies based on the frequency and time domain multiplexing method. Conclusively, we confirmed that the EC signal was processed appropriately in each circuit modules, and the Lissajous EC signal was displayed in the impedance plane.