• 한국산학기술학회논문지
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• 제22권2호
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• pp.434-439
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• 2021

본 논문은 복강경 자궁근종절제술을 받은 여성에서 정맥 내 아스코르브산 주입이 피로에 미치는 영향 알아보고자 하였다. 우리는 무작위 배정 양측맹검 위약대조 임상시험의 2차 평가변수의 결과를 분석하였다. 복강경 자궁근종절제술을 받은 환자 50명은 수술 중 아스코르브산 (2g)이나 위약을 수술 중 투여받았다. 환자 비율은 임의로 1:1 비로 하였다. 수술 후 2일차에는 간이 피로 평가지 (Brief Fatigue Inventory-Korean version, BFI-K)을 사용하여 피로수준을 평가하였다. 대상자가 동의를 철회하거나 수술을 취소한 경우 또는 평가변수가 측정되지 않은 5명은 제외되어 총 45명(시험군 23명, 대조군 22명)을 대상으로 분석하였다. 분석에 포함된 대상자의 임상적 특성은 실험군과 대조군간의 차이가 없었으며, 전체 피로도 점수도 실험군 (4.56 ± 2.63). 대조군 (5.21 ± 2.02 P = 0.351)으로 두 군간에 차이를 보이지 않았다. 그러나 대조군의 피로도 점수는 대부분의 영역에서 대조군의 피로도 점수보다 낮은 경향을 보였다. 결론적으로 복강경 자궁근종절제술을 시행받은 여성에서 정맥 내 아스코르브산 주입은 피로도를 크게 줄이지 못했으며, 추가적인 연구가 필요하다.

• Clinics in Shoulder and Elbow
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• 제1권1호
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• pp.93-99
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• 1998

상지의 외전에 따른 관절와상완운동 및 견갑흉곽운동은 전체적으로 1.6:1의 비율로 일어나고 있었으며 외전초기에는 주로 관절와상완관절에서 운동이 일어나고 외전후기에는 관절와상완운동보 다도 견갑흉곽운동에서 약간 더 많은 운동이 일어 남을 알 수 있었다. 상지가 외전시 외회전운동은 약 70도정도가 일어나 상당히 많은 양의 외회전이 일어나고 있음을 알 수 있었으며 이 외회전운동은 외전초기에는 완만하게 일어나다 외전후기에 주로 일어나고 있음을 관찰할 수 있었다. 외전하는 동안 상완골두의 상방전위는 90도까지 3mm로 일정하게 일어나다 그 후로는 하방으로 다시전위되어 최대외전에서는 전위의 변화가 거의 없었으며 이 전위는 견봉상완간격의 변화와 밀접한관계가 있음을 알 수 있었다. 그러나 본 연구는 이차원적인 견관절운동에 대한 연구로 이를 참조하여 추후 삼차원적인 입체적 분석 및 다양한 방향에서의 견관절운동에 대한 좀 더 많은 연구와 관심이 필요할 것으로 사료되었다.

• 한국해양공학회지
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• 제30권1호
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• pp.25-31
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• 2016

In this study, hydrodynamic coefficients were obtained from a Rotating Arm (RA) test, which is one of the captive model tests used to provide accurate coefficients in the control motion equation of an underwater vehicle. The RA test was carried out at the RA facility of ADD (Agency for Defense Development), and the forces and moments acting on the underwater vehicle were measured using a six-axis waterproof gage. A multiple regression analysis was used in the analysis of the measured data. The experimental results were also verified by comparison with the theoretical values of the previous linear coefficients. In addition, the stability indices in the horizontal plane were calculated using the linear and nonlinear coefficients, and the dynamic stability of the underwater vehicle was estimated to have a good dynamic performance with a depth ratio of 6.0.

• 보존과학회지
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• 제32권1호
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• pp.11-19
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• 2016

승자총통은 중국 화기를 모방하여 선조(宣祖,1552-1608) 시기에 독자적인 화기 제작방식으로 만들어진 우리나라 유통식 소화기(小火器)이다. 이 연구는 경희대학교 중앙박물관 소장 승자총통을 중심으로 명문 판독 결과와 함께 과학분석 결과를 정리한 것이다. 경희대학교 중앙박물관에 소장하고 있는 승자총통 3점은 각 원소의 함량차이가 크지 않은 Cu-Sn-Pb 삼원계 합금으로 제작되었고 분석대상 중 미세조직 분석이 가능한 승자총통 1의 미세조직을 분석한 결과 일반적인 주조방식에 의해 제작되었으며 추가적인 열처리나 담금질 흔적은 관찰되지 않는다는 점이 밝혀졌다. 또한 승자총통 제작 시 사용한 납의 출처를 알아보고자 납동위원소비 분석을 실시한 결과 한국 남부 zone 2 지역(경상북도 북부와 강원도 남부지역)의 납광석을 사용하여 승자총통을 제작한 것으로 판단된다.

• Clinical and Experimental Reproductive Medicine
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• 제43권4호
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• pp.247-252
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• 2016

Objective: Heparin can modulate proteins, and influence processes involved in implantation and trophoblastic development. This study aimed to assess the improvement of clinical pregnancy and implantation rates after local intrauterine injection of low-molecular-weight heparin (LMWH) in patients undergoing intracytoplasmic sperm injection (ICSI). Methods: A randomised case/control design was followed in women scheduled for ICSI. The study arm was injected with intrauterine LMWH during mock embryo transfer immediately following the ovum pickup procedure, while the control arm was given an intrauterine injection with a similar volume of tissue culture media. Side effects, the clinical pregnancy rate, and the implantation rate were recorded. Results: The pregnancy rate was acceptable (33.9%) in the LMWH arm with no significant reported side effects, confirming the safety of the intervention. No statistically significant differences were found in the clinical pregnancy and implantation rates between both groups (p= 0.182 and p= 0.096, respectively). The odds ratio of being pregnant after intrauterine injection with LMWH compared to the control group was 0.572 (95% confidence interval [CI], 0.27-1.22), while the risk ratio was 0.717 (95% CI, 0.46-1.13; p= 0.146). No statistical significance was found between the two groups in other factors affecting implantation, such as day of transfer (p= 0.726), number of embryos transferred (p= 0.362), or embryo quality. Conclusion: Intrauterine injection of LMWH is a safe intervention, but the dose used in this study failed to improve the outcome of ICSI. Based on its safety, further research involving modification of the dosage and/or the timing of administration could result in improved ICSI success rates.

• The Korean Journal of Pain
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• 제27권2호
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• pp.145-151
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• 2014

Background: The physician's hands are close to the X-ray field in C-arm fluoroscopy-guided pain interventions. We prospectively investigated the radiation attenuation of Proguard RR-2 gloves. Methods: In 100 cases, the effective doses (EDs) of two dosimeters without a radiation-reducing glove were collected. EDs from the two dosimeters-one dosimeter wrapped with a glove and the other dosimeter without a glove-were also measured at the side of the table (Group 1, 140 cases) and at a location 20 cm away from the side of the table (Group 2, 120 cases). Mean differences such as age, height, weight, radiation absorbed dose (RAD), exposure time, ED, and ratio of EDs were analyzed. Results: In the EDs of two dosimeters without gloves, there were no significant differences ($39.0{\pm}36.3{\mu}Sv$ vs. $38.8{\pm}36.4{\mu}Sv$) (P = 0.578). The RAD ($192.0{\pm}182.0radcm^2$) in Group 2 was higher than that ($132.3{\pm}103.5radcm^2$) in Group 1 (P = 0.002). The ED ($33.3{\pm}30.9{\mu}Sv$) of the dosimeter without a glove in Group 1 was higher than that ($12.3{\pm}8.8{\mu}Sv$) in Group 2 (P < 0.001). The ED ($24.4{\pm}22.4{\mu}Sv$) of the dosimeter wrapped with a glove in Group 1 was higher than that ($9.2{\pm}6.8{\mu}Sv$) in Group 2 (P < 0.001). No significant differences were noted in the ratio of EDs ($73.5{\pm}6.7%$ vs. $74.2{\pm}9.3%$, P = 0.469) between Group 1 and Group 2. Conclusions: Proguard RR-2 gloves have a radiation attenuation effect of 25.8-26.5%. The radiation attenuation is not significantly different by intensity of scatter radiation or the different RADs of C-arm fluoroscopy.

• 한국운동역학회지
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• 제23권3호
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• pp.253-259
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• 2013

The purpose of this study is to evaluate the influence of posture elements on symmetrical weight bearing during STS (sit-to-stand) in patients with chronic stroke. The subjects were patients diagnosed with stroke: a total of 24 patients (16 males and 8 females) participated in this study. All the participants performed STS tasks(3 foot postures and 2 arm postures). Two force plates (AMTI) were used to measure the peak vertical ground reaction force(Peak Fz) and the symmetrical ratio to peak vertical ground reaction force. The data were analyzed using independent t-test and 2-way repeated analysis of variance. The results of this study were as follows: 1) The peak Fz placed more weight on the paretic leg during STS and 2) The symmetrical ratio to the peak Fz showed a significant difference according to the foot and arm posture (p<.05), and had the highest AYM_GA ($0.87{\pm}0.12$). These results indicate that arm and leg postures during STS in patients with chronic stroke had the highest AYM_GA. We believe that the outcome of this study will be a reference for the prognosis of STS in patients with stroke.

• 한국운동역학회지
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• 제31권3호
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• pp.155-161
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• 2021

Objective: There is a lack of studies using the 3D-2D image registration techniques on the mechanism of a shoulder injury for ice hockey players. This study aimed to analyze in vivo 3D glenohumeral joint arthrokinematics in collegiate ice hockey athletes and compare shoulder scaption with or without a hockey stick using the 3D-2D image registration technique. Method: We recruited 12 male elite ice hockey players (age, 19.88 ± 0.65 years). For arthrokinematic analysis of the common shoulder abduction movements of the injury pathogenesis of ice hockey players, participants abducted their dominant arm along the scapular plane and then grabbed a stick using the same motion under C-arm fluoroscopy with 16 frames per second. Computed tomography (CT) scans of the shoulder complex were obtained with a 0.6-mm slice pitch. Data from the humerus translation distances, scapula upward rotation, anterior-posterior tilt, internal to external rotation angles, and scapulohumeral rhythm (SHR) ratio on glenohumeral (GH) joint kinematics were outputted using a MATLAB customized code. Results: The humeral translation in the stick hand compared to the bare hand moved more anterior and more superior until the abduction angle reached 40°. When the GH joint in the stick hand was at the maximal abduction of the scapula, the scapula was externally rotated 2~5° relative to 0°. The SHR ratio relative to the abduction along the scapular plane at 40° indicated a statistically significant difference between the two groups (p < 0.05). Conclusion: With arm loading with the stick, the humeral and scapular kinematics showed a significant correlation in the initial section of the SHR. Although these correlations might be difficult in clinical settings, ice hockey athletes can lead to the movement difference of the scapulohumeral joints with inherent instability.

• International Journal of Control, Automation, and Systems
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• 제1권3호
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• pp.263-270
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• 2003

This paper deals with a control technique of eliminating the transient vibration of a waist axis of an articulated robot. This technique is based on a model-based control in order to establish the damping effect on the mechanical part. The control model is related to the velocity control loop, and it is composed of reduced-order electrical and mechanical parts. Using this model, the velocity of the load is estimated, which is converted to the motor shaft. The difference between the estimated load speed and the motor speed is calculated dynamically, and it is added to the velocity command to suppress the transient vibration of a waist axis of the robot arm. The function of this technique is to increase the cut-off frequency of the system and the damping ratio at the driven machine part. This control model is easily obtained from design or experimental data and its algorithm can be easily installed in a DSP. This control technique is applied to a waist axis of an articulated robot composed of a harmonic drive gear reducer and a robot arm with 5 degrees of freedom. Simulations and experiments show satisfactory control results to reduce the transient vibration at the end-effector.

• 한국해양공학회지
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• 제17권4호
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• pp.73-80
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• 2003

This paper presents considerations on the results of the rotating arm test, which was carried out for assessment of an hybrid navigation system for a semi-autonomous underwater vehicle. The navigation system consists of an inertial measurement unit(IMU), an ultra-short baseline(USBL) acoustic navigation sensor and a doppler velocity log(DVL) accompanying a magnetic compass. A navigational systemmodel is derived to include the scale effect and bias errors of the DVL, of which the state equation composed of the navigation states and sensor parameters are 25 in the order. The extended Kalman filter was used to propagate the error covariance, The rotating arm tests were carried out in the Ocean Engineering Basin of KRISO, to generate circular motion. The hybrid underwater navigation system shows good tracking performance against the circular planar motion. Additionally this paper checked the effects of the sampling ratio of the navigation system and the possibility of the dead reckoning with the DVL and the magnetic compass to estimate the position of the vehicle.