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An Sihyun,Cho Gyeongjun,Ahn Jae-Hyung,Weon Hang-Yeon,Kim Dayeon,Ko Young-Joon,Yeon Jehyeong,Chung Joon-hui,Choi Han Suk,Heo Jun 한국미생물·생명공학회 2024 한국미생물·생명공학회지 Vol.52 No.1
제주도매립지에서분리된 Massilia strain KACC 81254BP 는생분해성플라스틱폴리하이드록시알카노에이트(PHA)를분해할수있다. 이균주의유전체는 5,028,452 bp의원형염색체로구성되어있으며, G+C 함량은 64.6%이다. 이유전체는 PHB depolymerase를포함한 4,513개유전자가확인되었다. 이유전체는신호전달과아미노산수송등대사와관련한다양한유전자를포함하고있다. 이연구는 Massilia sp. KACC 81254BP의폴리에스터 플라스틱 분해 효소와 관련된 유전학적 정보를 제공한다. Massilia sp. KACC 81254BP, isolated from a landfill on Jeju Island, Republic of Korea, possesses the capability to degrade polyhydroxyalkanoates (PHAs). The genomic analysis of strain KACC 81254BP consists of a circular chromosome comprising 5,028,452 base pairs with a DNA G+C content of 64.6%. This complete genome consists of a total of 4,513 genes, including those encoding the PHA degradation enzyme (PhaZ). This study offers valuable genomic insights into the enzymes responsible for degrading polyester plastics.
성별, 학교적응, 학업수행능력이 초등학생의 자아존중감에 미치는 영향 :잠재성장모형을 활용한 종단분석
김시현 ( Kim¸ Sihyun ) 인하대학교 교육연구소 2020 교육문화연구 Vol.26 No.6
본 연구는 성별이나 학교적응 등 개인적 변인과 자아존중감의 관계를 종단적으로 탐색함으로써 자아존중감 발달에 대한 이해를 넓히고, 증진과 관련된 시사점을 도출하고자 하였다. 이를 위해 한국아동패널 종단자료를 바탕으로 잠재성장모형을 적용하여 분석하였다. 분석 결과는 다음과 같다. 첫째, 아동의 자아존중감은 시간의 변화에 따라 미미하게 증가하였다. 둘째, 성별과 학업수행능력은 자아존중감 초기값에 정적으로, 변화율에는 부적으로 유의미한 영향을 미쳤으나 학교적응은 자아존중감의 변화에 유의한 영향을 미치지 않았다. 즉 여아이며, 학업수행능력이 높을수록 자아존중감 초기값이 높은 반면 변화율은 감소하였다. 셋째, 통제변인으로 투입한 월 가구소득은 아동 자아존중감의 초기값에 정적으로 유의한 영향을 미쳤다. 본 연구결과에 근거하여 아동의 자아존중감 증진을 위한 방안을 제시하였다. The purpose of this study was to investigate longitudinal changes in self-esteem of elementary school students and to identify the effect of gender, school adjustment, and academic performance on self-esteem by using latent growth modeling. For this, the longitudinal data collected by Korea Institute of Child Care and Education was used. The results of this study were as follows. Firstly, the child's self-esteem slightly has increased and there were individual differences in the initial value and rate of change of self-esteem. Secondly, gender and academic performance had a significant effect on the initial value of self-esteem positively while they had negative impacts on the rate of change. In other words, girls had higher initial values of self-esteem than boys and the higher the academic performance, the higher the initial value of self esteem, while the rate of change has decreased. Furthermore, school adjustment did not significantly affect the initial level and the change of self-esteem. Thirdly, monthly household income as a control variable had a statistically significant effect on the initial value of self-esteem. These findings of this study contribute to in-depth understanding of children’s self-esteem and providing appropriate interventions to enhance self-esteem of elementary school students.
태권도 자유 품새에 적용하기 위한 뛰어 앞차기 착지 동작의 상해 예방 전략
( Sihyun Ryu ) 한국운동역학회 2020 한국운동역학회지 Vol.30 No.1
Objective: The purpose of this study was to investigate the injury factors of Taekwondo jumping kick during landing phase according to the experience of injury and to suggest a stable landing movement applicable to free style Poomsae. Method: The participants were non-injury group (NG), n = 5, age: 20.5±0.9 years; height: 171.6 ±3.6 cm; body weight: 65.7±4.4 kg; career: 5.0±2.7 years. Injury group (IG), n = 9, age: 21.0±0.8 years; height: 170.9±4.6 cm; body weight: 67.1±7.0 kg; career: 8.6±5.0 years. The variables are impact force, loading rate, vertical stiffness, lower limb joint angle, stability, balance, and muscle activity in the landing phase. Results: NG was statistically larger than IG in the gluteus medius (p<.05). The impact force, loading rate and vertical stiffness decreased as the landing foot angle, the ROM of lower limb joint angle and COM displacement increased (p<.05). Conclusion: Based on the results, it means that the landing foot angle plays an important role in the impact reduction during landing phase. It is required the training to adjust the landing foot angle.
Sihyun Ryu,Jongbin Kim,Woo-Sub Kim,Sang-Kyoon Park 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.1
The purpose of this study was to investigate the effects of real-time visual bio-feedback during walking on the symmetry of the elderly gait. The subjects of this study were 16 elderly men (80.3 ± 4.6 years, 163.0 ± 4.7 cm, 64.7 ± 9.4 kg). They were asked to walk on a treadmill at the preferred speed, and later biofeedback was provided so that the subject could visually confirm the vertical ground reaction force of the both feet in real-time. The variables include three dimensional lower limb joint angle and bilateral symmetry index. As a result, the ROM of dorsi-flexion and plantar-flexion at the ankle joint was increased in the stance and swing phase after providing the visual biofeedback (p < .05). In addition, the symmetry index of double stance, single stance, ROM of hip AA at stance phase, and M/L COP range were decreased after providing the visual biofeedback (p < .05). The results suggested that the visual bio-feedback provided in real-time may have a positive effect on the symmetrical walking of the elderly. It is warranted whether gait exercise program using biofeedback would have a long term effect in future studies.
( Sihyun Ryu ),( Ho-jong Gil ) 한국운동역학회 2021 한국운동역학회지 Vol.31 No.4
Objective: The purpose of this research is to examine the effects of three types of different running shoes with different properties on impact variables (PVRGF and VLR) and the lower extremity joint's dynamic stability variables (LyEs of DPA, IEA, FEA, DPAV, IEAV, and FEAV) during running. Method: The participants in this research were 12 males (Age: 22.0 ± 3.3 years, Height: 177.2 ± 4.1 cm, Weight: 74.3 ± 9.6 kg). One type of N company's running shoes and two types (FA, FB) of F company's running shoes were used. As for the properties of the running shoes, thickness (mm), dwell time (ms), peak acceleration (m/s2), and energy return (%) were measured. The motions running at 3.5 m/s on a treadmill (Instrumented treadmill, Bertec, USA) wearing each type of running shoes were analyzed. Results: Although the VLR of the thick running shoes (FB) was smaller than that of the other running shoes (N, FA), the LyEs of PVGRF and DPA were larger (p<.05). Even though the running shoes' dwell time (i.e., impact absorption time) and peak acceleration showed a positive correlation with the LyEs of DPAV, IEAV, and FEAV, the energy return showed a negative correlation (p<.05). Conclusion: Our results indicated that the running shoes with excellent impact absorption function are predicted to be suitable for running beginners who need to reduce the burden of the lower extremity joint during running. The running shoes with excellent energy return are expected to be suitable for mid-and long-distance running elite athletes or marathoners to whom stability and consistency are essential during running.