• Journal of radiological science and technology
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• v.29 no.4
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• pp.229-236
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• 2006

Purpose: This study was conducted to search for the type of technical error in DEXA(dual-energy X-ray absorptiometry) and the effect of error to measurement of BMD. Materials and Methods: The changes of BMD($g/cm^2$, T-score) by patients information(Age, Weight, Height, Manopause age) input error and Confirming ROI error were investigated. Using spine phantom, we canned 10 times by age(5, 10), weight(10, 20 kg), height(5, 10 cm), manopause age(5, 10) increase & decrease respectively. Scanning region(L-spine, femur, Forearm) of 10 patients was calculated by changing ROI respectively. Analysis of difference for mean(precision 1%) were carried out. Results: The error of patient information(Age, Weight, Height, Manopause age) was not changed differently. In confirming ROI, the BMD and T-score of L-spine involving T-12 was decreased to $0.063\;g/cm^2$, 0.3 and involving L-5 increased to $0.077\;g/cm^2$, 0.5. In narrowing 1 cm of vertical line of ROI, the BMD and T-score decreased to $0.006\;g/cm^2$, 0.1 and in 2 cm, $0.021\;g/cm^2$, 0.15, each. In hip ROI, Upper and left shift(0.5 cm) of line was not influenced BMD and T-score. In 0.5 cm lower shift(lesser trochanter below), the BMD and T-score increased $0.031\;g/cm^2$, 0.3 and in 1 cm $0.094\;g/cm^2$, 0.65, each. In forearm ROI, the BMD and T-score decreased $0.042\;g/cm^2$, 0.9 involving 1 cm lower wrist. And expanding 1 cm of vertical line, the BMD and T-score decreased $0.008\;g/cm^2$, 0.1 and in 2 cm, $0.021\;g/cm^2$, 0.3, each. The L-spine, hip, forearm ROI error was changed differently. Conclusion: There are so many kinds of technical error in BMD processing. Errors according to age, weight, height, manopause age did not influent to $BMD(g/cm^2)$ and T-score. There are mean differences BMD and T-score in confirming ROI. For the precision exam, in L-spine processing, L1-4 have to confirmed without shift of ROI vertical line. In hip processing, the ROI have to included greater trochanter, femur head and lesser trochanter. In forearm processing, the ROI have to included wrist, radius and ulnar.

• Journal of Animal Environmental Science
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• v.12 no.1
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• pp.13-20
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• 2006

This experiment was carried out to determine the effect of breed and sex on behavioral characteristics and economic traits of performance-tested pigs. Totally 32 tested pigs in 4 different breeds were assigned for behavioral observation. Behavior was recorded for 4 hours(each 2 hours, before and after none) of tested pigs in each tested pen. The average daily gain, age at 90 kg and feed efficiency on the basis of the performance data were collected from 8,477 performance-tested pigs in which pure breeds of Duroc, Yorkshire, Landrace and Berkshire at the Korea Swine Testing Station. The results obtained in this study are summarized as follows; The effect of breed was statistically significant for all traits studied. Average daily gain were the highest(P<0.05) in Duroc and ages at 90 kg were the highest(P<0.05) in Berkshire. In feed efficiency of male, Landrace and Yorkshire were the most efficient. The average daily gain and feed efficiency were superior to those of female, however, the age at 90 kg was not different. Overally, females were superior to males in various traits examined. Berkshire breed had more proportion of time spent in ventral tying and sitting whereas the proportion of time spent in walking, drinking and eating was less than that of other breeds. The male pigs showed more time spent in standing and social behavior.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.11
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• pp.201-208
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• 2020

This study examined the anti-obesity effect of krill oil (KO) by regulating adipokines in a high-fat diet (HFD)-induced obese mouse model. The mice were fed a 60 kcal% HFD for 16 weeks, and KO was then administered at an oral dose of 100, 200, and 500 mg/kg/day for four weeks before the end of the experiment. The administration of KO at concentrations of 200 and 500 mg/kg/day decreased body weight gain significantly compared with the HFD-fed control group. In addition, the HFD-fed control group showed the abnormal release of adipokines by an increase in leptin and decrease in adiponectin, compared to the normal diet-fed normal group. On the other hand, KO (500 mg/kg/day)-administered group attenuated the abnormal release of adipokines by the down-regulation of leptin and the up-regulation of adiponectin. Therefore, KO could be a promising therapeutic agent for obesity by the regulation of adipokines.

• The Korean Journal of Nuclear Medicine Technology
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• v.13 no.3
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• pp.86-91
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• 2009

Purpose: The whole body scan in Nuclear Medicine is a widely accepted examination and procedure. Especially, it is mainly used in bone, I-131, MIBI, and HMPAO WBC scans. The diverse uses of the whole body scan range from the HMPAO WBC scan with a speed of 13cm/min, to a whole body bone scan using the Onco. Flash technique with a speed of 30cm/min. The accuracy of table movement has a strong correlation with the image quality, and inaccuracy of speed could negatively affect the image quality. The purpose of this study is to evaluate the accuracy of the table movement while considering the influence of the age of the equipment and the variability in the weight of the patients. Material and Methods: The study was conducted using two of Seoul Asan Medical Center's SIEMENS gamma cameras which are commonly used in our whole body study. The first one is the oldest gamma camera, an ECAM plus (installed in 2000), and the last is brand new one, a SYMBIA T2 (installed in 2008). Three trials were conducted with the tables moving at a different speed each time; 10, 15 and 30 cm/min. The tables' speeds were measured by checking how long it took for the table to move 10cm, and this was repeated every 10cm until the table reached 100 cm. With an average body weight of the patients of about 60~70 kg, the table speed was measured with weights of 0 kg, 66 kg and 110 kg placed on the table, then compared among conditions. Results: The coefficient of variance (CV) of the ECAM plus showed 1.23, 1.42, 2.02 respectively when the table movement speeds were set at 10, 15, and 30 centimeters per minute. Under the same conditions, the SYMBIA T2 showed 1.23, 1.83 and 2.28 respectively. As table movement speed more, the variance of CV as the speed increases. When the patient body weight was set to 0, 66 and 110kg, the CV values of both cameras showed 0.96, 1.45, 2.08 (0 Kg), 1.32, 1.72, 2.27 (66 Kg) and 1.37, 1.73, 2.14 (110 Kg). There was no significant difference (p>0.05) in 95 percent of confidence intervals and measured CV values were acceptable. However, the CV value of the SYMBIA T2 was relatively larger than the ECAM plus. Conclusion: The scan speed of the whole body scan is predetermined based on which examination is being performed. It is possible for the accuracy of the speed to be affected, such as the age of the equipment, the state of the bearings or the weight of a patient. These factors can have a negative impact on the diagnostic consistency and the image quality. Therefore, periodic quality control should be needed on the gamma cameras currently being used, focusing on the table movement speed in order to maintain accuracy and reproducibility.

• Proceedings of the KAIS Fall Conference
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• 2012.05a
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• pp.94-96
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• 2012

본 연구는 물리치료학과 학생들을 대상으로 젊은 여성 신발의 높이 차이가 신체의 정렬과 균형에 미치는 영향을 알아보고자 연구를 실시하였다. 평균 나이 20.5세인 여대생을 대상으로 걷기 운동을 통한 높이를 같게 한 신발의 종류에서의 실험 전과 후의 신체 정렬과 균형에 관해 비교분석하였다. 통계처리 방법으로 실험 전 후 차이를 검증하였고, 모든 통계적 유의수준은 0.05로 하였다. 본 연구의 결과 신발의 종류에 따른 신체정렬의 변화에서 7cm의 높은 힐과 편평힐은 몸통 경사, 불안정성에서 통계적으로 유의하지 않았다. 안정된 지면 및 불안정 지면에서 신발 종류에 따른 체중분포도와 정적 안정감에서 통계적으로 유희한 증가를 보였다. 향후 신발 굽의 지지면 면적의 비교뿐 아니라 좀 더 다양한 여성의 신발 굽을 비교분석하고 굽 높이와 신체 정렬간의 상관성 분석을 밝힐 필요성이 있다고 본다.

• The Journal of Korean Medicine
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• v.25 no.1
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• pp.205-212
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• 2004

Weight change in the postpartum period is a dominant concern of new mothers recently. Postpartum weight retention has important public health implications as well, because retention of gestational weight can be a significant contributor to longterm obesity and associated health risks. As traditional medical practitioners have managed some problems from postpartum weight retention, use some terms translated in Korean like as postpartumedema, obesity. But those have been not given any discuss objective and with evidences for nomenclature. Now reports review normal postpartum weight loss patterns, as well as risk factors for weight retention, ancient literatures, so practitioners can assist their patients in achieving a healthy postpartum weight.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.119-122
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• 2009

본 연구는 뇌졸중으로 인한 편마비 환자 20명을 대상으로 총 8주간 시지각 운동 과제를 적용하여 자세 균형, 보행 양상에 미치는 효과를 검증하고자 시행하였다. 실험군(n=10)과 대조군(n=10) 모두 보존적인 물리치료를 실시하였고 실험군에는 시지각 운동 과제 프로그램을 더하여 실시하였다. 본 연구의 결과는 실험군의 되먹임 측정을 통한 자세 균형 검사에서 편평한 지면 위에서 눈을 뜨고 감은 상태의 안정성 지수는 유의한 감소를 보였으며, pillow 위에서 눈을 뜨고 감은 상태의 안정성 지수도 유의하게 감소하였다. 체중분포지수는 편평한 지면에서 눈을 뜨고, 감은 상태와 pillow 위에서 눈을 뜨고 감은 상태 모두에서 유의하게 감소하였다. 실험군에서 10m 보행 속도는 대조군과 달리 유의하게 증가하였다. 본 연구에서의 시지각적 운동과제 프로그램은 편마비 환자의 신체기능과 관련된 자세균형 및 보행을 증진시키는 효과가 있었고 이에 보다 효과적인 운동방법으로 제시할 수 있다.

• Proceedings of the ESK Conference
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• 1997.10a
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• pp.463-467
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• 1997

인간에게 운동감을 적절히 제시해주기 위하여는 Newton에 의한 운동의 세가지 법칙뿐만 아니라 EInstein의 상대성이론이 첨가되어야 한다. 즉, Newton운동의 제1법칙에 의하여 피실험자가 외력을 받지 않으면 등속운동 또는 정지상태를 계속 유지하게 되어 자신이 등속좌표계에 고정되어있기 때문에 시각적 인 정보가 없으면 어떠한 운동감도 못 느낀다. 이때 피실험자에게 정지해있는 기준좌표계에 대하여 등속 으로 움직이는 것을 인식시켜주기 위하여 피실험자에 대한 기준좌표계의 상대속도를 시각정보로 제공해 주어야 한다. 또한 Newton운동의 제2법칙에 의하여 똑같은 힘이 외력으로 작용하더라도 피실험자의 질량과 가속도는 서로 반비례하므로 화면이동속도변화를 피실험자의 질량에 반비례하도록 제시해 주어야 한다(김 정흠, 1982). 본 연구에서는 이러한 개념에 근거하여, 체중이 다른 여섯 피실험자들로 구성된 시스템에 대해서 각 피실험자에게 서로 다른 변위를 주고자할 때, 여섯가지 외력에 요구되는 작용시간을 Jacobi Iteration 방법과 Gauss-Seidel Iteration 방법으로 구하는 알고리즘을 제시하였다(D.V. Griffiths and I.M. Smith, 1991).

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.295-298
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• 2019

본 논문은 기존의 수동으로 높이 조절만 가능한 단순 의자를 탈피하여 자라나는 아이의 신장과 체형에 맞게 의자 높이를 자동으로 조절해주는 스마트 의자를 제안한다. 본 논문의 주요 특징은 다음과 같다. 첫째, 초음파센서와 무게센서를 사용하여 아이의 신장과 체중을 측정함으로써 신체에 맞게 자동으로 의자의 각도와 높낮이를 조절해준다. 둘째, 센서를 통해 실시간으로 데이터를 수집하여 App 화면에 건강 상태를 보여주고 아이 등급표와 비교하여 아이의 성장률을 가시적으로 보여준다. 셋째, 압력 센서를 이용하여 아이의 자세 상태를 보여주고 App 알림과 데이터 분석으로 아이의 자세 교정에 도움을 준다. 넷째, 신호를 전달하면 지정된 자리로 의자가 자동으로 이동하는 기능을 제공한다. 제안된 시스템은 IoT 기술을 접목함으로써 성장이 빠른 영유아를 키우는 가정을 대상으로 의자 교체에 필요한 비용 절감 효과와 바쁜 현대인들을 위해 아이의 건강관리를 보다 효율적으로 돕는 것을 목표로 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.10
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• pp.4598-4603
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• 2012

The purpose of this study is to compare and evaluate the balance and muscle activity after having performed balance exercise at different ground conditions. The subjects were divided into 3 groups; Sand Group(SG)(N=30) and Balance Form group(BFG)(N=30), Hard Ground Group(HGG)(N=30). The period of intervention was for six weeks. EMG for Tibialis anterior(TA), Soleus(So), Biceps femoris(BF) muscle activity, Air-balance system 3D were used as evaluation tools for this study. the change of balance ability and TA, So muscle activity was greater in the SG, BFG than HGG which may imply that sand can be used for the balance exercise like any other ground.