• 대한통합의학회지
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• 제5권2호
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• pp.1-10
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• 2017

Purpose : This study was aimed at investgating the effect of short foot exercise(SFE) using an imagery technique on chronic ankle instability(CAI). Methods : Twenty subjects with chronic ankle instability were selected by using the Cumberland ankle instability tool. They were randomly assigned to one of two groups(10 in each group) : namely the short foot exercise group and imagery technique group. The short foot exercise group performed short foot exercise for 6 weeks(3 times a week, 15 min per session). The imagery technique group performed short foot exercise(3 times a week, 15 min per session) and the imagery technique(3 times a week, 5 min per session) for 6 weeks. We measured chronic ankle instability, balance and threshold of vibration sensation before and after exercise by using the Cumberland ankle instability tool, Biodex Balance System and VSA-II, respectively. Results : We found statistically significant differences in cumberland ankle instability tool, balance and threshold of vibration sensation between the groups(p<.05). Conclusion : We confirmed the effect of short foot exercise using an imagery technique. Thus, we thought these results could be used as basic data and reference for musculoskeletal therapy or intervention using an imagery technique.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권1호
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• pp.466-483
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• 2017

Zen Cart is an open-source online store management system. It is used all over the world because of its stability and safety. Today, Zen Cart's session security mechanism is mainly used to verify user agents and check IP addresses. However, the security in verifying the user agent is lower and checking the IP address can affect the user's experience. This paper, which is based on the idea of session protection as proposed by Ben Adida, takes advantage of the HTML5's sessionStorage property to store the shared keys that are used in HMAC-SHA256 encryption. Moreover, the request path, current timestamp, and parameter are encrypted by using HMAC-SHA256 in the client. The client then submits the result to the web server as per request. Finally, the web server recalculates the HMAC-SHA256 value to validate the request by comparing it with the submitted value. In this way, the Zen Cart's open-source system is reinforced. Owing to the security and integrity of the HMAC-SHA256 algorithm, it can effectively protect the session security. Analysis and experimental results show that this mechanism can effectively protect the session security of Zen Cart without affecting the original performance.

• The Journal of Korean Physical Therapy
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• 제26권3호
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• pp.209-215
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• 2014

Purpose: The purpose of this study is to examine the effects of postural control training using a horseback riding simulation on the spinal alignment of children with cerebral palsy. Methods: This study was conducted with 30 children with cerebral palsy at levels I~IV in the Gross Motor Function Classification System (GMFCS), and they were randomly divided into a control group and a hippotherapy group. Both the control group and the experimental group received NDT for 30 minutes per session, four times per week for ten weeks, while the experimental group also received hippotherapy 15 minutes per session, four times per week for ten weeks, after the neurodevelopmental treatment (NDT). The horseback riding simulators (JOBA, EU7805, Panasonic) used in this study simulated actual horse movements. Trunk imbalance, pelvic torsion, and pelvic tilt were measured in each group before the exercise and five weeks and ten weeks after the beginning of the exercise using a spinal structure analysis system (ABW Mapper). Results: The Intra-group effects on trunk imbalance, pelvic torsion, and pelvic tilt according to the exercise periods after the hippotherapy were tested, and the results showed significant interaction effects between the groups and the periods (p<0.05). Conclusion: The horseback riding simulation exercise was shown to be effective for the spinal alignment of children with cerebral palsy. Therefore, additional studies should be conducted with more children with CP divided by type.

• The Journal of Korean Physical Therapy
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• 제26권4호
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• pp.269-273
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• 2014

Purpose: The purpose of this study is to examine the effects of using a horseback riding simulation on static balance in children with cerebral palsy. Methods: This study was conducted with 30 children with cerebral palsy at levels I~IV in the Gross Motor Function Classification System (GMFCS), who were randomly divided into a control group and a hippotherapy group. Both the control group and the experimental group received NDT for 30 minutes per session, four times per week, for ten weeks, while the experimental group also received hippotherapy, 15 minutes per session, four times per week, for ten weeks, after the neurodevelopmental treatment (NDT). The horseback riding simulators JOBA (JEU7805, Panasonic, 일본) used in this study simulated actual horse movements; static balance was measured in each group before the exercise and five weeks and ten weeks after the beginning of the exercise using a pedoscan system (Diers Pedo, Germany). Results: The intergroup effects on static balance were tested, and the results showed no significant differences (p<0.05). Conclusion: The horseback riding simulation exercise was shown to be effective for the static balance of children with cerebral palsy. Therefore, additional studies should be conducted with more children with CP divided according to type.

• 인간식물환경학회지
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• 제22권2호
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• pp.159-165
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• 2019

The purpose of this study was to examine the effects of repetitive horticultural activities on the dexterity and out of seat behaviors of 5 years old children. Horticultural activities were conducted from March 3 to April 21, 2017, once a week for 20 minutes per session, a total of 8 sessions. The program was divided into first half (Sessions 1-4) and second half (Sessions 5-8) and horticultural activities were repeatedly carried out. In Sessions 1 and 5, kindergarteners transplanted succulent plants into pots, and observed and managed the plants daily. From Session 2 to 4 and from Session 6 to 8, kindergarteners watered and observed the succulent plants planted in Sessions 1 and 5 and they put flowers on a floral foam (10 × 10 × 10 cm). This study conducted the O'Connor Tweezer Dexterity Test in which the number of pins subjects inserted for 30 seconds was counted, and there was a significant difference (p =.000) in the dexterity of the kindergarteners after performing horticultural activities in the result of the repeated measures design ANOVA. The time kindergarteners left their seat for the first time while participating in horticultural activities for 20 minutes was measured using a stopwatch in each session. There was a significant difference (p =.000) in the ANOVA test in changes in their out of seat behavior in Session 8. In addition, there was no significant difference in the dexterity and out of seat behavior of kindergarteners from Session 2 (p =.364, p =.975, respectively) to Session 3 (p =.055, p =.283), but there was a significant difference from Session 4 (p =.042, p =.009) to Session 8 (p =.000, p =.000) as sessions were repeated.

• Journal of Communications and Networks
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• 제13권3호
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• pp.214-220
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• 2011

This paper attempts to address the effectiveness of physical-layer network coding (PNC) on the throughput improvement for multi-hop multicast in random wireless ad hoc networks (WAHNs). We prove that the per session throughput order with PNC is tightly bounded as ${\Theta}((n\sqrt{m}R(n))^{-1})$ if $m=(R^{-2}(n))$, where n is the total number of nodes, R(n) is the communication range, and m is the number of destinations for each multicast session. We also show that per-session throughput order with PNC is tight bounded as ${\Theta}(n^{-1})$, when $m={\Omega}(R^{-2}(n))$. The results of this paper imply that PNC cannot improve the throughput order of multicast in random WAHNs, which is different from the intuition that PNC may improve the throughput order as it allows simultaneous signal access and combination.

• The Journal of Korean Physical Therapy
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• 제22권6호
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• pp.43-51
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• 2010

Purpose: This study examined the influence of visuomotor congruency on learning a relative phase relationship between a single joint movement and an external signal. Methods: Participants (N=5) were required to rhythmically coordinate elbow flexion-extension movements with a continuous sinusoidal wave (0.375 Hz) at a $90^{\circ}$ relative phase relationship. The congruent group was provided online feedback in which the elbow angle decreased (corresponding to elbow flexion) as the angle trajectory was movingup, and vice versa. The incongruent group was provided online feedback in which the elbow angle decreased as the angle trajectory was moving down, and vice versa. There were two practice sessions (day 1 and 2) and each session consisted of 6 trials per block (5 blocks per session). Retention tests were performed 24 hours after session 2, and only the external sinusoidal wave was provided. Repeated ANOVAs were used for statistical analysis. Results: During practice, the congruent group was significantly less variable than the incongruent group. Phase variability in the incongruent group did not significantly change across blocks, while variability decreased significantly in the congruent group. In retention, the congruent group produced the required $90^{\circ}$ relative phase pattern with significantly less phase variability than the incongruent group. Conclusions: Congruent visual feedback facilitates learning. Moreover, the deprivation of online feedback does not affect the congruent group but does affect the incongruent group in retention.

• Communications for Statistical Applications and Methods
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• 제8권1호
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• pp.271-279
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• 2001

Sequential pattern discovery is one of main interests in web usage mining. the technique of sequential pattern discovery attempts to find inter-session patterns such that the presence of a set of items is followed by another item in a time-ordered set of server sessions. In this paper, a tree-based sequential pattern finding method is proposed in order to discover navigation patterns in server sessions. At each learning process, the suggested method learns about the navigation patterns per server session and summarized into the modified Rymon's tree.

• ETRI Journal
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• 제35권4호
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• pp.726-729
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• 2013

For secure multimedia communications, existing encryption techniques use an online session key for the key exchange, for which key size is limited to less than 10 digits to accommodate the latency condition caused by user devices only being able to handle low computational loads. This condition results in poor security of recorded encrypted data. In this letter, we propose a packet key scheme that encrypts real-time packets using a different key per packet for multimedia applications. Therefore, a key of a relatively small size can provide after-transmission confidentiality to data of a real-time session.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 춘계학술대회
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• pp.6-8
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• 2022

웹 로그 분석은 서비스 개선에 있어 필수적인 절차 중 하나이다. ScienceON은 다양한 과학기술 문헌과 정보를 서비스하는 대표적인 정보 서비스이며, 우리는 지속적인 개선을 위해 웹 로그를 분석하고 있다. 본 연구는 2020년 5월과 2021년 5월 생성된 ScienceON 웹 로그에 대해 인간과 웹 크롤러로 구분하여 심층적인 분석을 하는 데 목표를 두고 있다. 먼저 S(검색), V(상세보기), D(다운로드) 타입에 해당하는 웹 로그만 추출하여 각 시기에 대해 658,407와 8,727,042 레코드로 정규화하였다. 그리고, 파이썬 'user_agents' 라이브러리를 이용하여 인간과 웹 크롤러로 로그를 분리하였으며, 각 로그에 대해 60초를 기준으로 세션 크기를 설정하고 분석하였다. 인간과 달리 웹 크롤러는 세션 당 평균 행위 패턴(Average Behaviors per Session)의 길이가 상대적으로 길고, 행위 패턴이 V 중심으로 이루어짐으로 확인하였다. 향후 웹 크롤러를 쉽게 탐지하고 대응하며, 인간 사용자의 행위 패턴에 대응할 수 있도록 서비스를 개선할 예정이다.