• Title, Summary, Keyword: MFR

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Alternative Optimal Threshold Criteria: MFR (대안적인 분류기준: 오분류율곱)

  • Hong, Chong Sun;Kim, Hyomin Alex;Kim, Dong Kyu
    • The Korean Journal of Applied Statistics
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    • v.27 no.5
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    • pp.773-786
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    • 2014
  • We propose the multiplication of false rates (MFR) which is a classification accuracy criteria and an area type of rectangle from ROC curve. Optimal threshold obtained using MFR is compared with other criteria in terms of classification performance. Their optimal thresholds for various distribution functions are also found; consequently, some properties and advantages of MFR are discussed by comparing FNR and FPR corresponding to optimal thresholds. Based on general cost function, cost ratios of optimal thresholds are computed using various classification criteria. The cost ratios for cost curves are observed so that the advantages of MFR are explored. Furthermore, the de nition of MFR is extended to multi-dimensional ROC analysis and the relations of classification criteria are also discussed.

A Study on Resource Allocations of Multi Function Radar in a Warship (함정의 다기능레이더(MFR) 자원할당 방안에 관한 연구)

  • Park, Young-Man;Lee, Jinho;Cho, Hyunjin;Park, Kyeongju;Kim, Ha-Chul;Lim, Yo-Joon;Kim, Haekeun;Lee, Hochul;Chung, Suk-Moon
    • Journal of the Korea Society for Simulation
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    • v.28 no.1
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    • pp.67-79
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    • 2019
  • A warship equipped with Multi Function Radar(MFR) performs operations by evaluating the degree of threats based on threats' symptom and allocating the resource of MFR to the corresponding threats. This study suggests a simulation-based approach and greedy algorithm in order to effectively allocate the resource of an MFR for warships, and compares these two approaches. As a detection probability function depending on the amount of allocations to each threat, we consider linear and exponential functions. Experimental results show that both the simulation-based approach and greedy algorithm allocate resource similarly to the randomly generated threats, and the greedy algorithm outperforms the simulation-based approach in terms of computational perspective. For a various cases of threats, we analyze the results of MFR resource allocation using the greedy algorithm.

Study on Spray Characteristics of GCSC Injector with Recess in High Pressure Condition (고압조건에서 기체-액체 분사기의 리세스에 따른 분무 특성 연구)

  • Kim, Jong-Gyu;Han, Yeoung-Min;Choi, Hwan-Seok;Yoon, Young-Bin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.57-60
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    • 2011
  • The spray characteristics according to the recess length of the GCSC injector and the change of momentum flux ratio(MFR) of the gas and the liquid have been examined through high pressure cold flow test using a high pressure chamber. The liquid in this experiment was water, and the gas was nitrogen. The spray images were taken by a back-lit strobe imaging technique. Results showed that the spray was a wide hollow cone at the lower MFR(liquid velocity was fixed) and the spray became a narrow solid cone as the MFR was increased. And the injector with short recess length produced a narrow solid cone at the higher MFR.

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Immediate effect of self-myofascial release on hamstring flexibility

  • Jung, Jihye;Choi, Wonjae;Lee, Yonghyuk;Kim, Jiwoo;Kim, Hyunju;Lee, Kyoungho;Lee, Jaewoo;Lee, Seungwon
    • Physical Therapy Rehabilitation Science
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    • v.6 no.1
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    • pp.45-51
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    • 2017
  • Objective: This study aimed to identify the area with greatest effect using self-myofascial release technique (self-MFR) in the hamstring, suboccipital, and plantar regions. Design: Cross-sectional study. Methods: Twenty-two adult subjects were evaluated for flexibility and hamstring pain threshold after self-MFR. Based on the superficial back line, the self-MFR application areas were the suboccipital region, hamstring, and plantar regions. Self-MFR was applied to each area using a wooden pole for a total of 4 minutes. Self-MFR was applied for 3 days at the same time of day, which was randomly assigned for each subject. Treatment was applied to one area each day. The sit and reach test (SRT), active range of motion (AROM), and passive ROM (PROM) were used to determine changes in flexibility, and an algometer was used to determine pain threshold. Pre/post-self-MFR effectiveness was tested using a paired t-test. Repeated measurement was used to compare self-MFR effects in the suboccipital, hamstring, and plantar regions. Results: When the self-MFR technique was applied to the 3 areas, the SRT showed significant improvement over baseline (p<0.05). Bilateral AROM and PROM showed significant improvements (p<0.05). When the self-MFR technique was applied to the hamstring, the semimembranosus showed a significant change in pain threshold (p<0.05). Conclusions: Our findings suggest that indirect application based on the Anatomy Trains could be effective for those who need to improve muscle flexibility. Moreover, self-MFR easily alleviates myofascial pain while maintaining flexibility, and can be performed at any time and place.

The Effect of MFR and Taping on the Pain Level in Whiplash Injury (근막이완술과 테이핑이 경부 손상 환자의 통증감소에 미치는 효과)

  • Lee Mun-hwan;Park Rae-Joon
    • The Journal of Korean Physical Therapy
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    • v.16 no.3
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    • pp.125-141
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    • 2004
  • The purpose of this study was to assess the effectiveness of myofascial release(MFR) technique and Taping therapy on the pain level in whiplash injury patients. Pain level were assessed prior treatment, after first treatment, after second treatment, after third treatment, after fourth treatment, and after fifth treatment. All 6 times were calculated pain level. To find out the effectiveness of MFR and Taping therapy, we were divide two groups. The one group was consisted of 25 patients that were treated with H/P, electrical therapy and MFR, and the other group was consisted of 25 patients that were treated with H/P, electrical therapy, and Taping therapy. The results were as follow: 1. There were statistical significance on the pain level in MFR group during all treatment periods(p<0.05). 2. There were statistical significance on the pain level in Taping group all during treatment periods(p<0.05). 3. Taping group had more statistical significance than MFR group on the pain level during all treatment periods(p<0.05). Consequently, this study suggest that Taping therapy has a very effectiveness to the whiplash injury patients.

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Detection of Low-RCS Targets in Sea-Clutter using Multi-Function Radar (다기능 레이다를 이용한 저 RCS 해상표적 탐지성능 분석)

  • Lee, Myung-Jun;Kim, Ji-eun;Lee, Sang-Min;Jeon, Hyeon-Mu;Yang, Woo-Yong;Kim, Kyung-Tae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.30 no.6
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    • pp.507-517
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    • 2019
  • Multi-function radar(MFR) is a system that uses various functions such as detection, tracking, and classification. To operate the functions in real-time, the detection stage in MFR usually uses radar signals for short measurement time. We can utilize several conventional detectors in the MFR system to detect low radar cross section maritime targets in the sea-clutter; however, the detectors, which have been developed to be effective for radar signals measured for a longer time, may be inappropriate for MFR. In this study, we proposed a modelling technique of sea-clutter short measurement time. We combined the modeled sea-clutter signal with the maritime-target signal, which was obtained by the numerical analysis method. Using this combined model, we exploited four independent detectors and analyzed the detection performances.

Effect of Fascial Distortion Model on the Pain and Movement of Neck Patient

  • Kim, Min Kyu;Lee, Woo Jin
    • The Journal of Korean Physical Therapy
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    • v.31 no.1
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    • pp.24-30
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    • 2019
  • Purpose: This study compared the effectiveness of three methods, fascial distortion model (FDM), myofascial release (MFR), self-myofascial release (SMR), on the neck range of motion and pain. Methods: In this study, the collected data were processed statistically using SPSS version 22.0 for Windows. Descriptive statistics were used to analyze the general characteristics of the subjects. Repeated measure ANOVA was conducted to analyze the range of motion of the neck of the group and VAS, and Contras was used to see the difference in significance over time. One-way ANOVA was used to compare the differences among the groups and a post-hoc test was used. The significance level (${\alpha}$) was 0.05. Results: In the range of motion, the flexion and extension of the neck, right rotation, and left rotation were significantly different in the SMR, FDM, and MFR groups. The right lateral flexion showed significant differences in the FDM, MFR, and SMR groups. The VAS was similar in the groups at 2 and 4 weeks, but there was a significant difference among the FDM, MFR, and SMR groups at 6 weeks. Conclusion: In this study, MFR and MSR as well as FDM were effective in controlling the range of motion and pain control of the neck. Further studies will be needed to determine the effects of long-lasting treatments other than pain control. These studies and the present study will be used as a basis for ongoing research into the duration and method of application for musculoskeletal therapies.

2-Year Follow up of Balance in Stroke Patients after Myofascial Release using a Tennis Ball -Four Case Reports-

  • Hwang, Young-In;Yoon, Jang-Whon;Park, Du-Jin
    • PNF and Movement
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    • v.16 no.1
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    • pp.1-6
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    • 2018
  • Purpose: Myofascial release (MFR) is an effective treatment for improving muscle stiffness and balance in neurological patients. This study examined long-term effects of MFR on the balance ability of stroke patients. Methods: MFR using a tennis ball was applied to the lower extremity and sacroiliac joint of the affected side of four stroke patients. The four subjects performed the Berg balance scale (BBS) and Timed up and go (TUG) test at the beginning of an 8-week intervention, directly after the intervention, and 2 years later. Results: The BBS scores indicated a trend toward maintenance of balance (p=0.05), but there was no difference in the TUG time (p=0.47). Conclusion: MFR may be a clinically meaningful intervention to maintain balance in stroke patients over a long period. However, the sample size in this study was too small to draw general conclusions. A larger study with more participants is needed.

Reliability Evaluation of Power Distribution System Considering Maintenance Effects (유지보수 영향을 고려한 배전계통 신뢰도 평가)

  • Moon, Jong-Fil;Shon, Jin-Geun
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.59 no.2
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    • pp.154-157
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    • 2010
  • In this paper, the Time-varying Failure Rates(TFR) of power distribution system components are extracted from the recorded failure data of KEPCO(Korea Electric Power Corporation) and the reliability of power distribution system is evaluated using Mean Failure Rate(MFR) and TFR. The TFR is approximated to bathtub curve using the exponential and Weibull distribution function. In addition, Kaplan-Meier estimation is applied to TFR extraction because of incomplete failure data of KEPCO. Also the reliability of the real power distribution system of Korea is evaluated using the MFR and TFR extracted from real failure data, respectively and the results of each case are compared with each other. As a result, it is proved that the reliability evaluation using the TFR is more realistic than MFR. In addition, it is presented that the application method at power distribution system maintenance and repair using the result of TFR.

Strain Improvement by Overexpression of the laeA Gene in Monascus pilosus for the Production of Monascus-Fermented Rice

  • Lee, Sang Sub;Lee, Jin Hee;Lee, Inhyung
    • Journal of Microbiology and Biotechnology
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    • v.23 no.7
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    • pp.959-965
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    • 2013
  • Monascus species have been used to produce fermented rice called Monascus-fermented rice (MFR). To improve a Monascus strain via activation of secondary metabolite (SM) gene clusters for use in the production of MFR, we overexpressed an ortholog of the laeA gene, which encodes a global positive regulator of secondary metabolism under the control of the strong heterologous Aspergillus nidulans alcA promoter in Monascus pilosus. The OE::laeA transformant produced more SMs, including those not detected under uninduced conditions. MFR produced using the M. pilosus OE::laeA strain contained 4 times more monacolin K, a cholesterol-lowering agent, than MFR produced using the wild-type strain. In addition, pigment production was remarkably increased, and the antioxidant activity was increased as well. The results from this study suggest that Monascus species, which are important industrial fermentative fungi in Asia, can be improved for the production of functional foods by overexpressing the laeA gene.