• Title/Summary/Keyword: 스트랩

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The Effect of Changes in Patellar Height Using Infra-Patellar Strap on the EMG Activity of Quadriceps Muscles During a Squat Exercise in Adults With Patellar Baja (하위 무릎뼈를 지닌 성인들을 대상으로 쪼그려 앉기 운동 시 하위 무릎뼈 스트랩을 이용한 무릎뼈 높이 변화가 넙다리네갈래근의 근 활성도에 미치는 영향)

  • Kang, Min-Hyeok;Kim, Ji-Won;Yoon, Ji-Yeon;Jang, Jun-Hyeok;Oh, Jae-Seop
    • Physical Therapy Korea
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    • v.19 no.1
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    • pp.37-45
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    • 2012
  • The purpose of this study was to assess the influence of patellar height on quadriceps muscles' electromyography (EMG) activity during a squat exercise in adults with patella baja. For the study, we recruited 15 volunteers who had patella baja on the right side. We measured the EMG activity of the right rectus femoris, vastus medialis oblique, and vastus lateralis muscles during squat exercises under two conditions, specifically with and without an infra-patellar strap. The infra-patellar strap was applied below the tested patella to elevate the patella to a normal height. A paired t-test was used to compare the effects of patella height on EMG activity of the quadriceps muscles. The EMG activity of the rectus femoris (RF), vastus medialis oblique (VMO), and vastus lateralis (VL) muscles were significantly decreased during the squat exercise with the infra-patellar strap compared to the same exercise without the infra-patellar strap (p<.05), while the VMO/VL ratio was not different significantly between two conditions (p>.05). The findings of this study suggest that an infra-patellar strap may benefit people with patellar baja, as changes in patellar height could improve the efficiency of the quadriceps muscles.

The Strap Vibration Characteristics in $5{\times}5$ Grid Exposed to Axial Flow (축방향 유속에 노출된 $5{\times}5$ 지지격자 스트랩의 진동특성)

  • Kim, Kyoung-Hong;Park, Nam-Gyu;Kim, Kyoung-Ju;Suh, Jung-Min
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.04a
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    • pp.911-916
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    • 2012
  • It is important to identify dynamic characteristics of nuclear fuel components. Since the fuel always exposed to turbulent flow, the dynamic contact between grids and rods is one of the fuel failure modes. The dynamic behavior of grids in nuclear fuels is quite complex, since two pairs of spring support are placed in the limited space. The strap in a cell has single spring and double dimples and this paper focuses on investigation of the grid strap(Test Fuel Strap, TFS) vibration in one cell. To identify the grid strap vibration, modal analysis of the strap is performed using Finite Element Method (FEM). Modal testing on a $5{\times}5$ grid structure without rods is performed. The modal testing results are compared to analytic results. In addition, random test considering rod effect is performed about a $5{\times}5$ grid with rods under real contact condition in the air. Finally, the strap vibration of a $5{\times}5$ fuel bundle in INvestigation of Flow INduced vIbraTion(INFINIT) facility is measured in real fluid velocity condition without heating. It is shown that modal frequencies from the test are almost equal to those peak frequencies in the INFINIT test.

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Lateral Crush Strength of Nuclear Fuel Spacer Grid Considering Weld Properties (용접물성치를 고려한 핵연료 지지격자체 횡방향 충격강도)

  • Song, Kee Nam;Lee, Sang Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.12
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    • pp.1663-1668
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    • 2012
  • A spacer grid, which is one of the structural components in a PWR fuel, is an interconnected array of slotted grid straps that are welded at the intersections to form an egg-crate structure. The spacer grid is required to have sufficient lateral crush strength to enable nuclear reactor shut-down during abnormal operating environments. Previous studies on the lateral crush strength analysis of the spacer grid were performed using only the base material properties. In this study, to investigate the effect of the lateral crush strength of the spacer grid when using the mechanical properties in the weld zone instead of the base material properties, lateral crush strength analysis by considering the mechanical properties in the weld zone as obtained from the instrumented indentation technique was performed, and the results were compared with those of previous studies.

Secure 6LoWPAN Neighbor Discovery Address Registration Protocol (안전한 6LoWPAN Neighbor Discovery 주소 등록 프로토콜)

  • Han, Sang-woo;Park, Chang-seop
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.29 no.1
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    • pp.17-28
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    • 2019
  • 6LoWPAN based on IEEE 802.15.4 is a realistic standard platform for various Internet of Things (IoT) applications. To bootstrap the LoWPAN (Low-power Wireless Personal Area Network), each device must perform 6LoWPAN-ND address registration to assign a unique IPv6 address. Without adequate security mechanisms, 6LoWPAN-ND is vulnerable to a variety of security attacks including corrupted node attacks. Several security mechanisms have been proposed as a supplement to the vulnerability, but the vulnerability exists because it relies solely on IEEE 802.15.4 hop-by-hop security. In this paper, we propose and analyze a vulnerability of 6LoWPAN-ND address registration and a new security mechanism suitable for preventing the attack of damaged node. It also shows that the proposed security mechanism is compatible with the Internet Engineering Task Force (IETF) standard and is more efficient than the mechanism proposed in the IETF 6 lo WG.

Comparison of Trunk Muscle Activity according to Different Strap Length of TRX (TRX 스트랩 길이에 따른 체간 근육의 활성도 비교)

  • Hong, Yeon Kyung;Yoon, Sukhoon
    • Korean Journal of Applied Biomechanics
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    • v.32 no.1
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    • pp.31-36
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    • 2022
  • Objective: The purpose of this study was to investigate muscle activation according to the four strap lengths in the TRX plank exercise to provide scientific and accurate data on effective training methods. Method: Twenty healthy men who had at least 6 months of weight training experience and could fully adjusted plank exercise, were participate in this study (age: 25.2 ± 3.7 yrs., height: 174.2 ± 3.9 cm., weight: 71.2 ± 9 kg). To pursue the study purpose, surface electrodes were attached to trunk muscles (pectoralis major, rectus abdominis, external oblique, internal oblique, erector spinae, latissimus dorsi) and lower extramity muscles (gluteus maximus, rectus femoris, gastrocnemius), and the muscle activity was measured using 11-channel electromyography equipment. In order to verify the muscle activation according to the four strap lengths during TRX plank exercise, an one-way ANOVA with repeated measure was used with statistical significance level set at as α=.05. Results: First, there were statistically significant differences in pectoralis major, rectus abdominis, external oblique, internal oblique, and erector spinae among TRX strap lengths. Second, there were statistically significant differences in gluteus maximus, rectus femoris, and gastrocnemius among TRX strap lengths. Third, even though no statistically significant difference found in latissimus dorsi, but increased muscle activation tendency was showed as the length of the strap increased. Conclusion: From the results of this study, it may be possible that TRX exercise prevent injuries and improve lower extremity muscle as well as trunk muscles by setting appropriate length of strap.

Effects of Thermal and Salinity Stress on Expression of FK506BP in the Red Seabream (Pagrus major) (참돔(Pagrus major)에서 온도 및 염분 스트레스가 FK506BP 발현에 미치는 영향)

  • Min, Byung Hwa;Myeong, Jeong-In;Kang, Han Seung
    • Journal of Marine Life Science
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    • v.2 no.1
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    • pp.34-38
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    • 2017
  • FK506BP (FK506 binding protein 12) is a small peptide with a single FK506BP domain. It is involved in suppression of immune response, oxidative stress and inflammation. The purpose of this study was to investigate the gene expression of FK506BP in red seabream (Pagrus major) exposure to low water temperature (8℃, 33 psu) and low salinity (20℃, 10 psu). Results showed that, the expression of FK506BP was significantly increased in the experiment groups, such as low water temperature (8℃, 33 psu), and low salinity (20℃, 10 psu). These results suggest that FK506BP was played roles in biomarker gene on the environmental stress such as water temperature and salinity.

Fabrication of Series Connected c-Si Solar Strap Cells for the See-through Type Photovoltaic Modules (See-through 형태의 투광형 태양광 모듈 제조를 위한 직렬접합형 스트랩 제조 기술)

  • Min-Joon Park;Sungmin Youn;Minseob Kim;Eunbi Lee;Kiseok Jeon;Chaehwan Jeong
    • Current Photovoltaic Research
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    • v.11 no.4
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    • pp.114-117
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    • 2023
  • Transparent Photovoltaic (PV) modules have recently been in the spotlight because they can be applied to buildings and vehicles. However, crystalline silicon (c-Si) solar modules, which account for about 90% of the PV module market, have the disadvantage of applying transparent PV modules due to their unique opacity. Recently, a see-through type PV module using a crystalline silicon solar strap has been developed. However, there is a problem due to a decrease in aesthetics due to the metal ribbon in the center of the see-through type PV module and difficulty bonding the metal ribbon due to the low voltage output of the strap. In this study, to solve this problem, we developed a fabrication process of series connected c-Si solar strap cells using the c-Si solar cells. We succeeded in fabricating a series connected strap with a width of 2-10 mm, and we plan to manufacture an aesthetic see-through type c-Si PV module.

Effects of Forearm Strap on Wrist Extensor Activity, Grip Strength, and Pain in Patients with Chronic Lateral Epicondylitis (만성 가쪽위관절융기염 환자에서 아래팔 스트랩 적용이 손목폄근 활성도, 악력 및 통증에 미치는 영향)

  • Hyun Ju Lee;Ha Yeon Koo;Seo Jun Shin;Da Hui Kim;Ki Sik Tae
    • Journal of Biomedical Engineering Research
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    • v.44 no.6
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    • pp.482-487
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    • 2023
  • The purpose of this study was to investigate changes in wrist extensor activity, pain, and grip strength before and after wearing a forearm strap in their 20s who complained of chronic lateral epicondylitis for more than 6 weeks. As a result of the study, there was an increase in wrist extensor activity on both the injured and non-injured sides after wearing the forearm strap, but this was not statistically significant. There was a statistically decrease in pain after wearing the forearm strap on the injured side, and a statistically significant increase in grip strength on both. After applying the forearm strap with pad, there was an increase in muscle activity of ECRB (extensor carpi radialis brevis) on both the injured and non-injured sides. This is thought to be due to the strap pad acting as a compressive force, reducing pain, and increasing muscle recruitment ability due to stability in wrist extension. However, considering that the number of study subjects is insufficient to generalize the results, additional supplementary research is deemed necessary.

Neural Network Based Land Cover Classification Technique of Satellite Image for Pollutant Load Estimation (신경망 기반의 오염부하량 산정을 위한 위성영상 토지피복 분류기법)

  • Park, Sang-Young;Ha, Sung-Ryong
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 2001.12a
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    • pp.1-4
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    • 2001
  • The classification performance of Artificial Neural Network (ANN) and RBF-NN was compared for Landsat TM image. The RBF-NN was validated for three unique landuse types (e.g. Mixed landuse area, Cultivated area, Urban area), different input band combinations and classification class. The bootstrap resampling technique was employed to estimate the confidence intervals and distribution for unit load, The pollutant generation was varied significantly according to the classification accuracy and percentile unit load applied. Especially in urban area, where mixed landuse is dominant, the difference of estimated pollutant load is largely varied.

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A Study on the Relationship between Vertical Separation and Operational Efficiency of Railway Industry (철도산업의 수직분리와 운영효율성의 관련성에 관한 연구)

  • Kim, Seong-Ho;Choi, Tae-Sung
    • Journal of the Korean Society for Railway
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    • v.12 no.6
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    • pp.844-851
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    • 2009
  • Since 1990s, the European railway sector has undergone both a vertical separation and a vertical integration. Recently Simar and Wilson (2008) provides a bootstrap test procedure for testing whether two groups' mean efficiencies are equivalent. The purpose of this paper is to ascertain the relationship between vertical separation and operational efficiency of railway industry using the Simar and Wilson's bootstrap test procedure not used in previous studies with a data set of 20 European countries from 1998 to 2005. From the value of test statistic it seems that the mean operational efficiencies of vertically separated railway industry were higher than those of vertically integrated railway industry. However the p-value indicates that the differences of mean operational efficiencies are not significat at any meaningful level.