• Journal of Power Electronics
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• 제18권5호
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• pp.1434-1447
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• 2018

The control design of inductive power transfer (IPT) systems has attracted a lot of attention in the field of wireless power transmission. Due to the high-order resonant networks and multiple loads in IPT systems, a simplified model of an IPT system is preferred for analysis and control design, and a controller with strong robustness is required. Hence, an active disturbance rejection control (ADRC) for IPT systems is proposed in this paper. To realize the employment of ADRC, firstly a small-signal model of an LC series-compensative IPT system is derived based on generalized state-space averaging (GSSA), then the ADRC is implemented in the designed IPT system. The ADRC not only provides superior robustness to unknown internal and external disturbances, but also requires few knowledge of the IPT system. Due to the convenient realization of ADRC, the designed IPT system retains its simple structure without any additional circuits. Finally, a frequency domain analysis and experimental results have validated the effectiveness of the employed ADRC, especially its robustness in the presence of frequency drifts and other common disturbances.

• 한국군사과학기술학회지
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• 제14권3호
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• pp.380-387
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• 2011

In this paper, we considered the authoritative representation of Command and Fire Control System(CFCS) for the surface ship that was the engineering level model to develop system specifications and to analyze operational concepts on the concept design phase and to analyze military requirements, effectiveness and performance for the system. The engineering level model of CFCS can be used in simulation independently of the surface ship's type, and also it takes reuse, interoperability, and extension into consideration. The detailed sub-models, internal and external data interface, data flow among each sub-model, sensor and weapon models about the engineering level model of CFCS was defined. It was verified via engineering level simulations according to the V&V process.

• 대한물리치료과학회지
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• 제25권1호
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• pp.62-74
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• 2018

Background: The purpose of this study is intended to evaluate the effectiveness and analyse the change on flexibility, muscular volume and pain of university students with low back pain by stabilization exercise using XCO. Methods: The subjects(N=23) with low back pain are recruited from K university located Chungbuck. The subjects which are divided to 2 group as experimental group(N=12) conducted the stabilization exercise using XCO and control group(N=11) conducted the general stabilization exercise. The flexibility, muscular volume and pain were measured before and after intervention. Results: There were no significant differences(p>.05) in sex, age, height and weight among subjects. Also there were no significant differences(p>.05) in muscular volume and pain between of the experimental group and control group. A significant difference(p<.05) in the flexibility, contraction EO(External Oblique), contraction IO(Internal Oblique), contraction TA(Transverse Abdominal) and pain in the experimental group. There was significant difference(p<.05) in the flexibility, contraction EO(External Oblique), contraction IO(Internal Oblique) and pain in the control group. There was a significant difference(p<.05) in the flexibility of the experimental group between the control group. Conclusion: Based on this study, through a variety of age and various intervention period to apply more subjects conducting Stabilization exercise using XCO should continue.

• 대한한방내과학회지
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• 제40권6호
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• pp.1318-1324
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• 2019

Objectives: The purpose of this study was to evaluate the effectiveness of the management of blood glucose in diabetes mellitus using modified Jawonjihwang-tang in a Korean medical clinic, retrospectively. Methods: From 2006 to 2018, 150 patients diagnosed with diabetes who visited a Korean medical clinic were treated with Korean medicine. Then, 81 of them were prescribed Jawonjihwang-tang. Five cases who changed the formula during the procedure were excluded; therefore, 76 cases were finally selected. Their therapeutic effects were evaluated by the variance in glycated hemoglobin (HbA1c). Results: After administration of Jawonjihwang-tang, most patients exhibited a decreased level of HbA1c, and 24 patients had normalized the level of HbA1c. The HbA1c level of all patients decreased from 9.1±2.2 to 7.8±2.2 significantly (p<0.001). Conclusions: It is concluded that Jawonjihwang-tang may control blood glucose in diabetes patients. However, more prospective randomized clinical trials are warranted to verify this conclusion.

• 대한한방내과학회지
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• 제41권3호
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• pp.362-413
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• 2020

Objectives: The purpose of this research is to examine the recent clinical research trends on the efficiency of traditional herb medicine (THM) on gastroesophageal reflux disease (GERD), and to provide clinical evidence of herbal medicine, Banhasasin-tang or Banxiexin decoction by using a systemic review and meta-analysis of randomized trials (RCTs). Methods: In this study, randomized controlled trials (RCTs) were included that verified effects of traditional herbal medicine (THM), including a Banxia-xiexin-tang decoction, as a treatment for GERD. A study of the literature in Chinese and Korean databases was performed for papers published from January 1, 2010, to January 1, 2020. The selected literature was assessed by Cochrane's risk of bias (RoB). Results: A total of 90 RCTs met the inclusion criteria. Except for four RCT studies, all studies identified the effect of a Banxia-xiexin-tang decoction in the treatment of GERD. The effectiveness of treatment was significantly higher in the intervention group than in the control group, as shown through various evaluation indicators, including the reflux disease diagnostic questionnaire (RDQ). Adverse effects were reported in 22 articles (24.44%). Conclusions: Treatment with Banhasasin-tang, or a Banxia-xiexin-tang decoction, was found to be effective in treating GERD. However, due to the low quality of available studies, the significance of this conclusion is somewhat limited. This study could serve as a foundation for further clinical studies on the development of diagnosis and treatment methods for GERD based on Korean medicine.

• 대한한방내과학회지
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• 제43권1호
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• pp.22-40
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• 2022

Objectives: The purpose of this study is to assess the antidiabetic effect and safety of Galgunhwangryunhwanggum-tang for type 2 diabetes without complications by analyzing related research. Methods: For a systematic review and meta-analysis, we searched for the antidiabetic effect and safety of Galgunhwangryunhwanggum-tang for type 2 diabetes without complications in 10 databases up to September 2021. Only randomized controlled trials were chosen. Results: In the treatment effectiveness analysis and meta-analysis, Galgunhwangryunhwanggum-tang had significant improvement effects on fasting plasma glucose level, 2-hour postprandial glucose level, glycated hemoglobin, fasting insulin, and homeostasis model assessment for insulin resistance compared to the control group when treated in parallel with oral glycemic drugs. Conclusion: Galgunhwangryunhwanggum-tang is effective in improving blood sugar and insulin resistance in type 2 diabetes patients without complications and can especially be considered in parallel treatment with oral hypoglycemic drugs. A large-scale randomized controlled clinical trial is required to complement the limitations presented in this study in the future.

• 대한한방내과학회지
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• 제38권4호
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• pp.433-442
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• 2017

Objectives: The purpose of this study was to assess the effectiveness of acupuncture for the treatment of Raynaud's disease. Methods: This review was conducted using nine electronic databases (CINAHL, CiNii, CNKI, EMBASE, J-STAGE, NDSL, OASIS, PubMed, and WANFANG) and the keywords "Raynaud's disease", "Raynaud disease", "acupuncture", and "needling". Only randomized controlled trials (RCTs) using acupuncture for Raynaud's disease were included, and the methodological quality of the trials was assessed using the Cochrane risk-of-bias tool. Results: After screening, six RCTs were selected among 67, and the total effective rate and peripheral blood flow were used as evaluation methods. In five studies, the total effective rate was significantly higher in the intervention group than in the control group. In three studies, peripheral blood flow was higher in the intervention group than in the control group, with two studies being statistically significant and the remaining study not being statistically significant. Conclusions: Acupuncture could be a suitable treatment without adverse effects for Raynaud's disease because it improves peripheral blood flow. However, further studies, including randomized, placebo-controlled, double-blind methods, and clear evaluation criteria are needed.

• 대한예방한의학회지
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• 제26권2호
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• pp.11-24
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• 2022

Objectives : This study was designed to investigate the effect of Banhahubak-tang on gastroesophageal reflux disease(GERD) through a systematic review and meta-analysis of randomized controlled trials(RCTs). Methods : RCTs using Banhahubak-tang on GERD was searched in databases such as EMBASE, PubMed, MEDLINE, CENTRAL, CNKI, KISS, RISS, ScienceON, and OASIS. RCTs published up to October 8th, 2021 were included. Meta-analysis was performed by synthesizing outcome data, including Total Effectiveness Rate (TER), Reflux Symptom Index(RSI), Reflux Finding Score(RFS), and Incidence of Adverse Reactions. RevMan 5.4 software was used for data analysis. The Cochrane collaboration bias risk assessment scale was used to evaluate the methodological quality of the included studies. Results : Ten RCTs met the inclusion criteria. The total effective rate was the most commonly used outcome measure. The meta-analysis revealed that the TER in the experimental group was higher than that of the control group(N=2, RR:1.22, 95% CI:1.09 to 1.36, P=0.0004, I²=0%)(N=6, RR:1.22, 95% CI:1.14 to 1.32, P<0.00001, I²=0%)(N=8, RR:1.22, 95% CI: 1.14 to 1.30, P<0.00001, I²=0%). On the other hand, RSI(N=2, MD : -4.29, 95% CI: -4.71 to -3.86, I²=94%), RFS(N=2, MD : -3.28, 95% CI: -3.71 to -2.85, I²=96%), and Incidence of Adverse Reactions(N=5, RR: 0.32, 95% CI: 0.17 to 0.61, I²=0%) in the experimental group were lower than that of the control group. Conclusion : Treatment with Banhahubak-tang was found to be effective on GERD. However the results might be biased because of the poor quality and small sample size of the included RCTs.

• 한국융합학회논문지
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• 제13권1호
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• pp.365-373
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• 2022

본 연구의 목적은 기업의 이사가 여러 기업의 이사직을 겸임할 때 내부회계관리제도(IACS)의 품질에 미치는 영향을 확인하는 것이다. 분석을 위해 2014-2019년까지 금융업을 제외한 9,343개의 KOSPI&KOSDAQ기업-연도자료를 활용하였다. 분석결과, 기업 내 이사가 다른 기업의 이사직을 많이 겸임할수록 IACS의 품질은 낮아지는 것으로 확인되었다. 또한 이사회를 구성하는 사내이사와 사외이사는 역할차이가 존재함에도 불구하고, 겸임하는 사내이사와 사외이사가 많을수록 IACS의 품질은 동일하게 낮아지는 것으로 나타났다. 이는 비즈니스 가설에 의해 이사직 겸임으로 더욱 바빠진 이사가 그들의 업무에 충분한 노력을 투입하지 않아 기업 내 대리문제가 발생하여 나타난 결과라고 할 수 있다. 이러한 결과는 기업지배구조의 효율성을 평가함에 있어 겸임이사에 관한 정보가 이사회의 특성을 반영하는 새로운 지표가 될 수 있음을 시사한다.

• Journal of Acupuncture Research
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• 제39권2호
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• pp.96-104
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• 2022

This study aimed to examine the clinical efficacy of electroacupuncture treatment for carpal tunnel syndrome by reviewing published randomized controlled trials. Among the 186 studies retrieved from 7 online databases (PubMed, Cochrane library, CNKI, NDSL, RISS, OASIS, KMbase) on October 29, 2021, 4 studies were selected according to the inclusion, exclusion criteria, and were evaluated using risk of bias. Control groups for electroacupuncture were wearing a splint at night, traditional acupuncture, and medication. Methods such as total effective, functional status scale, symptom severity scale, electromyography, tip pinch strength, visual analogue scale, numeric rating scale, and ultrasound were used to evaluate the therapeutic effect. Electroacupuncture was reported to have significant treatment results compared with the control group in methods such as total effectiveness, electromyography, and tip pinch strength. However, the quality of the studies (using risk of bias) does not allow reliable conclusions to be made. Many high quality (low risk of bias) randomized controlled trials are needed to examine the efficacy of electroacupuncture treatment for carpal tunnel syndrome.