• Journal of the Korean Applied Science and Technology
• /
• v.39 no.4
• /
• pp.507-516
• /
• 2022

The purpose of this study was to investigate the effect of rotational preference on body stability based on COP and EMG analysis in an quiet standing after turn in the left and right directions. The subjects of this study were 16 subjects with a high lateral preference for the right hand and foot. The subjects of this study were 16 subjects with high unilateral preference for the right hand and foot, and three rotational direction conditions (QS: quiet standing, LT: 10 turns on the left, RT: 10 turns on the right) were performed. In order to evaluate the stability in an quiet standing after turning, the results were derived and analyzed using a COP plate and an EMG. As a result of the study, LT and RT were larger than QS for all COP variables, but there was no difference according to the direction of turning. In EMG, RT showed larger muscle activity than the QS according to the rotational direction in left and right gastrocnemius. In conclusion, although all subjects had a high right lateral preference, there was no effect of rotational preference in COP, and gastrocnemius showed the effect of rotational preference.

• Proceedings of the Korean Information Science Society Conference
• /
• 2004.10a
• /
• pp.229-231
• /
• 2004

추천 시스템은 양질의 정보를 추천하기 위해서 사용자의 관심도를 반영해야 한다. 이를 위해 본 연구에서는 강화학습과 관련 정보, 비관련 정보를 모두 이용하는 피드백 방법을 결합하였다. 사용자의 문서에 대한 평가를 평가 값으로 사용하여 사용자가 선호하는 용어와 선호하지 않는 용어를 추출하고, 이를 이용해 사용자 프로파일을 강화학습으로 학습하게 된다. 제안된 방법으로 신문기사 추천시스템에 적용하여 실험한 결과, 관련 정보와 비관련 정보를 함께 사용한 방범이 기존의 관련 정보안물 사용한 방법보다 더 나은 성능을 보였다.

• Journal of Digital Convergence
• /
• v.12 no.4
• /
• pp.319-326
• /
• 2014

According to the increasing mobile security users who have experienced authentication failure by forgetting passwords, user names, or a response to a knowledge-based question have preference for biological information such as hand geometry, fingerprints, voice in personal identification and authentication. Therefore biometric verification of personal identification and authentication for mobile security provides assurance to both the customer and the seller in the internet. Our study focuses on human hand biometric information recognition system for personal identification and personal Authentication, including its shape, palm features and the lengths and widths of the fingers taken from mobile phone photographs such as iPhone4 and galaxy s2. Our hand biometric information recognition system consists of six steps processing: image acquisition, preprocessing, removing noises, extracting standard hand feature extraction, individual feature pattern extraction, hand biometric information recognition for personal identification and authentication from input images. The validity of the proposed system from mobile phone image is demonstrated through 93.5% of the sucessful recognition rate for 250 experimental data of hand shape images and palm information images from 50 subjects.

• Journal of the Ergonomics Society of Korea
• /
• v.30 no.1
• /
• pp.259-264
• /
• 2011

Does preferred hand show better performance than non-preferred hand in smart phone text entry using one hand. Is the performance of subjects who use left-preferred hand in smart phone text entry worse than that of others who use right preferred hand among the right handed. This study tried to address these two questions. Thirty young male undergraduate students typed a text using a smart phone which has a touch-based QWERTY keyboard two times with both hands, right and left hand, respectively. The completion time, errors were measured in the text entry tasks. All of participants were right handed, but half of them preferred right hand if they have to use one hand in smart phone text entry and other half preferred left hand. The percentage that preferred hand has better performance than non-preferred hand in smart phone text entry using one hand is less than 90% for right-preferred hand and less than 70% for left-preferred hand. The performance of left hand preferred students is not worse than that of the right hand preferred in one hand text entry of smart phone.

• Journal of Food Hygiene and Safety
• /
• v.24 no.2
• /
• pp.128-135
• /
• 2009

Hand-washing is one of the most important factors in infection control and in preventing cross-contamination. The objective of this study was to investigate female university students' awareness of hand-washing, their hand washing practices, and the difference between their awareness and practices. A self-administered questionnaire survey and direct observation in restrooms were separately carried out in a university campus and over four weeks' period. A total of 97.4% of the survey respondents claimed to wash their hands after using toilet, and 98.2% of the observed students actually did so according to the unnoticed observational study. However, only 6.3% of the students who washed their hands in the direct observation washed for more than 10 seconds, although 46.4% of respondents in the survey reported that they usually wash their hands for more than 10 seconds. Among the observed students who washed their hands, only 0.9% used soap, and 0.9% washed four parts of their hands. Paper towel was the most common hand-drying method in the direct observation and also in the survey. Significant differences were found in duration, use of soap, part of washing, and hand-drying method between the questionnaire survey and the direct observation (p<0.05). This study indicates that there is a noticeable difference between the awareness of hand-washing and hand-washing practices among female university students. Further research should examine hand-washing practices of female university students in restrooms outside the university campus.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.10 no.1
• /
• pp.90-98
• /
• 1999

This paper presents a wideband single-balanced mixer using a diode which can be used in RF receiver of microwave measurement systems. For wideband characteristic, local oscillator(LO) signal is provided to diode with low loss using a coplanar waveguide-to-slotline balun. For high isolation characteristic radio frequency (RF) port and intermediate frequency (IF) port are designed using directional coupler. This mixer presents 30.5~31.17dB conversion loss whose flatness is within 1dB for 9 kHz~2.6 GHz wideband RF signal, and above 30 dB isolation for LO signal.

• The Journal of Korean society of community based occupational therapy
• /
• v.4 no.2
• /
• pp.1-10
• /
• 2014

Objective : The purpose of this study was to investigate the preferences of kitchen environment for stroke patients. Methods : The subjects of this study were 97 who have experience in rehabilitation therapy at hospitals in Busan. A questionnaire was distributed and collected from February 24th to March 13th, 2014. Descriptive statistics of frequency Study were used to analyze data. Results : First, the subjects demand for improvement that use a chair for work and install non-slip tiles. Second, they preferred the non-slip mat, boilers in heating equipment, drawer storage, L-shaped safety handle, adjustable sink of the height, automatic cutout of gas leak, faucet of touch-sensitive type, ㄷ-shaped kitchen and the ceiling-type hood in ventilation system. Third, they need kitchen items such as the sink self coming down, scissors for slices and knife to avoid hand injury. Conclusion : This study would contribute to kitchen environment for fall prevention and ease in use.

• Proceedings of the Korean Society of Dyers and Finishers Conference
• /
• 2003.04a
• /
• pp.123-127
• /
• 2003

최근의 항균가공법을 대별하면 후가공법과 원사 개량법이 알려져 있으며 제품의 특성에 따라 선택되고 있다. 원사개량법은 항균 내구성을 확보할 수 있으나 합섬 원사 제조업체만 개발 가능한 방법으로 원사 구입의 어려움과 구입 단가가 높으며 섬유자체의 물성 및 염색성 등의 문제점이 있다. 한편 일반적인 가공법인 후가공법은 일반 제조업체에서 선호하는 가공법이나 항균효과의 내구성이 부족하며 사용수지 및 가공 환경상의 문제로 유리포르말린 및 중금속함량, 염색견뢰도 저하 등의 문제점을 가지고 있다. (중략)

• Proceedings of the Korean Information Science Society Conference
• /
• 2008.06b
• /
• pp.588-591
• /
• 2008

본 논문은 Data mining에서 선호도 분석 등에 사용되는 Skyline Query[2] 중 자료의 속성에 spatial한 성질이 있을 때 사용할 수 있는 Spatial Skyline Query[3] 문제에 대해 연구한다. 우선 Spatial Skyline 집합을 추출하기 위한 기존의 알고리즘의 문제점을 짚어보고 보다 개선된 알고리즘을 제시한다. 또한 전체 Spatial Skyline 집합이 아닌 그 중 더 의미 있을 수 있는 부분 집합을 좀 더 빠른 시간 복잡도에 구하는 방법 또한 제시한다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2011.11a
• /
• pp.977-978
• /
• 2011

21세기 초부터 휴대폰으로 인터넷에 접속하는 다양한 서비스가 제공되었으며 스마트폰 사용량은 급증하였고 위협요소 또한 많아졌다. 본 논문은 스마트 폰을 위협하는 악성코드의 종류와 감염경로를 파악하고 그 사례를 통해 문제점을 제시한다.