• Journal of the Korean Society of Propulsion Engineers
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• v.19 no.5
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• pp.31-36
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• 2015

As one of the most promising propulsive systems in the future, the dual-mode scramjet engine has drawn the attention of many researches. Detailed flow features concerned with the isolator play an important role in the dual-mode scramjet system. The 2D numerical method has been used for the dual-mode scramjet with wind tunnel. To validate the ability of the numerical model, numerical results have been compared with the experimental results. Overall pressure distributions show quite good match with the experimental results. Back pressure has been studied for maximum pressure rising. According to the results, pressure distribution of supersonic inlet section is not influenced by back pressure. The shock train is pushed towards upstream as the back pressure increases. The maximum value of back pressure without inlet unstart goes up rapidly and then keeps constant when the isolator length increases. The optimal length of isolator section ($L/H_{th}$) is 8.7 in this model.

• Journal of Korean Medicine Rehabilitation
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• v.27 no.3
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• pp.117-124
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• 2017

Objectives Collaboration medicine means cooperate with western medicine and traditional korean medicine to treat the one disease. In Korea, Interest in collaboration medicine is increasing, But the number of studies is scare. Therefore we will conduct collaboration medicine study for the low back pain. Methods This study composes prospective cohort registry study. If the patients who need collaboration medicine by doctor come, we will ask regist this study. And patient select collaboration treatment group and single treatment group. Total 120 patients will recruit from collaboration pilot project hospitals. Each group patient will observed 4 weeks. Telephone research will conducted after 1 month from the last follow up. During the treatment, patients are treated usual treatment type of each medicine. Primary outcome is NRS and secondary outcomes are EQ-5D and ODI. We will analyze difference of 1 week and 4 week outcome result. Conclusions This study is the first large sample size study effect of collaboration medicine in Korea for low back pain. We check present collaboration system and improve collaboration system. Aim of this study is to find the effectiveness collaboration medicine for low back pain in the real condition. And we expect this pilot study will provide the clinical collaboration information and basis.

• Journal of Preventive Medicine and Public Health
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• v.35 no.1
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• pp.65-71
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• 2002

Objective : To estimate the status of HIV infection and AIDS incidence using a back-calculation model in Korea. Methods : Back-calculation is a method for estimating the past infection rate using AIDS incidence data. The method has been useful for obtaining short-term projections of AIDS incidence and estimating previous HIV prevalence. If the density of the incubation periods is known, together with the AIDS incidence, we can estimate historical HIV infections and forecast AIDS incidence in any time period up to time t. In this paper, we estimated the number of HIV infections and AIDS incidence according to the distribution of various incubation periods Results : The cumulative numbers of HIV infection from 1991 to 1996 were $708{\sim}1,426$ in Weibull distribution and $918{\sim}1,980$ in Gamma distribution. The projected AIDS incidence in 1997 was $16{\sim}25$ in Weibull distribution and $13{\sim}26$ in Gamma distribution. Conclusions : The estimated cumulative HIV infections from 1991 to 1996 were $1.4{\sim}4.0$ times more than notified cumulative HIV infections. Additionally, the projected AIDS incidence in 1997 was less than the notified AIDS cases. The reason for this underestimation derives from the very low level of HIV prevalence in Korea, further research is required for the distribution of the incubation period of HIV infection in Korea, particularly for the effects of combination treatments.

• Physical Therapy Korea
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• v.17 no.3
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• pp.31-39
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• 2010

The purpose of this study was to determine the effect of sciatic nerve mobilization technique on perceived pain, straight leg raise test (SLR), and strength of knee extensor, location of symptoms (LOS) in patients with chronic low back pain. 22 patients with chronic low back pain were recruited for this study. The subjects were randomly assigned to either the experimental group (EG) or the control group (CG), with 11 patients in each group. All patients received a routine physical therapy (hot pack and transcutaneous electrical nerve stimulation). The mobilization technique of the sciatic nerve was performed for 10 min in the case of the EG subjects. Outcome measurements included the level of the perceived pain, SLR, and strength of the knee extensor, LOS. The measurements were recorded 3 times: before the intervention, after the intervention, and at 1 hour of follow up. The two groups did not significantly differ with regard to the level of perceived pain, SLR, and strength of the knee extensor, LOS before the test (p>.05). In the case of the EG subjects, all the variables measured after the intervention significantly differed from those measured before the intervention (p<.05). However, in the case of the CG subjects, a significant difference was noted only with regard to the level of perceived pain (p<.05). The findings indicate that sciatic nerve mobilization technique exerts a positive effect on the control of subjective symptoms and knee strength in patients with chronic low back pain. Further studies are required to generalize the result of this study.

• The Journal of Korean Medical History
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• v.28 no.1
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• pp.93-102
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• 2015

Objectives : The aim of this paper is finding the combinations of the medicinal herbs that are used frequently by analyzing the details of the herbal medicinal prescriptions used by the patients who were diagnosed with M54 code diseases. In addition, I will seek to assess the demonstrative pattern that frequently manifest in the M54 code disease patients by using the combinations of the medicinal herbs that are used frequently. Methods : After having extracted the prescription administered to the patients with the diagnostic code of M54, find the relevance with the demonstrative pattern by analyzing the combination for each of the medicinal herb effectiveness. Use the list of medicinal herbs utilized in the corresponding prescription to examine the most frequent combination of the medicinal herbs through the generation of up to 25 arbitrary combinations of the medicinal herbs. Results & Conclusions : As the results of the analysis of the details of the use of the prescribed herbal medicine packages by the Korean Medicine Hospital of Pusan National University, regarding the back pain of the diagnostic code M54, the prescriptions that corresponded to the kidney deficiency pattern, static blood pattern, wind pattern, dampness pattern, food accumulation pattern, qi depression pattern and phlegm-retained fluid pattern back pain among the back pain classifications under the Dongeuibogam (東醫寶鑑) were used frequently, and, regarding the Nape Pain, prescriptions that corresponded to the pain arising from the wind-dampness and phlegm the 'Taeyang meridian' was most frequent.

• The Korean Journal of Pain
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• v.18 no.1
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• pp.43-47
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• 2005

Background: The optimal management of pain using magnetic irradiation modalities continues to attract considerable debate. Therefore, we conducted a randomized, double-blind, placebo-controlled clinical trial to determine the effectiveness of pulsed electromagnetic therapy for the treatment of chronic lower back pain. Methods: Fifteen-minute sessions of active (n = 20) or placebo (n = 20) electromagnetic therapy were repeated 3 times a week for 3 weeks. Patients were assessed using the 11-point numerical rating scale and the revised Oswestry disability scores for up to 4 weeks after therapy. Results: The active magnetic group showed significantly more pain reduction than the placebo group immediately after therapy and one and four weeks after therapy (P < 0.05). At 4 weeks after therapy percentage changes in NRS from baseline were $22{\pm}24%$ and $38{\pm}11%$ in the placebo and magnetic groups, respectively. The revised Oswestry disability percentage in the active magnetic group was also significantly improved (P < 0.05). Conclusions: Pulsed electromagnetic therapy provided pain relief and ameliorated disability in patients with chronic lower back pain. According to our results, pulsed electromagnetic therapy should be considered an important potential therapeutic tool for the conservative therapy of chronic lower back pain.

• The Journal of Korean Obstetrics and Gynecology
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• v.32 no.4
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• pp.14-24
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• 2019

Objectives: The purpose of this review is to assess the effects of Chuna manipulation for postpartum pelvic pain and low back pain. Methods: To investigate the effects of Chuna manipulation for postpartum pelvic pain and low back pain, we searched the seven database (Korean Obstetrics and Gynecology, Oasis, National Digital Science Library, Pubmed, Cochrane Library, Embase, China National Knowledge Infrastructure) and manually checked related clinical trials up to May, 2019. Results: Seven studies were included in this review. Chuna and other manipulation (Osteopathy and Tuina) were effective in relieving postpartum pelvic pain and improving Oswestry Disability Index. Conclusion: This review suggests Chuna manipulation produces clinically relevant benefits for postpartum women with pelvic pain and low back pain. Further research may change estimates of effect, and larger, high-quality randomized controlled trials with robust comparison groups are recommended.

• The Journal of Churna Manual Medicine for Spine and Nerves
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• v.16 no.2
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• pp.1-8
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• 2021

Objectives This study aimed to evaluate the effect of chuna manual therapy (CMT) for postpartum low back pain using a systematic review. Methods We performed a literature search using 12 electronic databases up to the end of September 2021. We included randomized controlled trials (RCTs) that evaluated the effect of CMT in the treatment of postpartum low back pain. The risk of bias was evaluated using the Cochrane risk-of-bias tool. Results Four randomized controlled trials were reported statistically significant effect in pain VAS, ODI and JOA of chuna manual therapy compared with moxibution, electro acupuncture, hyperthermia or usual care. As a result of assessing the risk of bias tool, most of the contents of the evaluation items were not identified, so it was evaluated as an uncertain risk. Conclusions CMT may be effective in treating postpartum low back pain. However, evidence was limited due to the small sample size, lack of well-designed RCTs and regional bias. Further well-designed studies are required to obtain stronger evidence.

• Journal of Digital Policy
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• v.3 no.1
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• pp.21-25
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• 2024

This is a case study that sought to consider whether taping, which focuses on instability of the sacroiliac joint, is a potential intervention method that may be helpful for low back pain. In the case of a 58-year-old participant, we summarized the notable results from a taping training session that a man with a history of back surgery due to disc herniation and stenosis participated in to reduce ongoing pain. As an intervention method, tape was applied between the 2nd and 4th sacrum on both sides from the spinous tuberosity. It was stretched to a tension of 80% and attached past the sacroiliac joint, and then the ends were raised at about 45° on both sides and attached toward the gluteus medius muscle. Then, along the erector spinae muscle from the iliac crest. Bilateral taping up to the level of the 10th rib was applied. Through this intervention, positive case results were observed from both VAS and ODI test tools, with VAS recorded as 5 to 0 and disability index recorded as 13 to 0, respectively.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.690-693
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• 2005

In this paper, a hybrid PD-servo state feedback control algorithm for swing up inverted pendulum system is proposed. It consists of two parts. The first part is the PD position control for swinging up the pendulum from the natural pendent position to around the upright position and the second part is the servo state feedback control for stabilizing the inverted pendulum in upright position. The first controller is PD controller and it is tuned to control the position of the pendulum by moving the cart back and forth until the pendulum swings up around the upright position. Then the second controller will be switched to stabilize the inverted pendulum in its upright position. The controller in this stage is the servo state feedback controller designed by pole placement. Experimental results of PD type swinging up control system, of stabilizing servo state feedback control system and of the proposed hybrid PD-servo state feedback control system to swing up and stabilize inverted pendulum show that the proposed method is effective and reliable for actual implementation while it is simple.