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Hyunjoong Kim(Hyunjoong Kim),Dongjin Lee(Dongjin Lee) 물리치료재활과학회 2023 Physical therapy rehabilitation science Vol.12 No.4
Objective: Clinical practice guidelines for chronic low back pain (LBP) strongly recommend thrust manipulation; however, its effectiveness for acute and subacute nonspecific LBP is controversial. Therefore, the aim of this systematic review and meta-analysis was to synthesize the immediate or short-term effects of thrust manipulation on pain in patients with acute and subacute LBP. Design: Asystematic review and meta-analysis. Methods: A literature search was performed in international databases (CINAHL, Embase, MEDLINE, PubMed) in June 2023. Search terms were set according to PICOSD (participants, intervention, comparison, outcomes, study design). Risk of bias (RoB) assessment was performed using the RoB tool and quantitative analysis was performed using RevMan 5.4. The effect measure was standard mean difference (SMD) and the analysis model was random effect model. Results: The database was searched for 249 studies and six randomized controlled trials (RCTs) were finally synthesized after independent review by researchers. Only pain intensity was found to have a significant effect on pain intensity and disability (p<0.05). The pooled results showed a small effect size for pain intensity in acute to subacute LBP with thrust manipulation in sixRCTs(SMD= -0.44; 95% CI, -0.80 to -0.08) and a large effect size for disability in three RCTs (SMD= -0.96; 95% CI, -2.67 to 0.76). Conclusions: In conclusion, this review provides evidence supporting the effectiveness of thrust manipulation in reducing pain intensity and disability in patients with acute and subacute LBP. It highlights the potential benefits of incorporating thrust manipulation as a treatment option for LBP.
Hyunjoong Kim,Seonghyeok Song,Sangbong Lee,Seungwon Lee 물리치료재활과학회 2021 Physical therapy rehabilitation science Vol.10 No.1
Objective: Joint mobilization for arthrokinematics altered by the positional fault of chronic ankle instability (CAI) is an effective intervention for stabilization. In this study, we compared the effects of ankle dorsi flexion range of motion (DFROM) and dynamic balance ability (DBA) in CAI patients via passive joint mobilization (PJM), a method traditionally performed in previous studies, and active joint mobilization (AJM), a method that can have a greater effect on cortical excitability with spontaneous movements. Design: Single-blind two-arm randomized controlled trial Methods: A total of 30 participants were registered: 15 each to the PJM and AJM groups. Each participant received a total of 10 intervention sessions, 10 minutes per session, 5 times a week for 2 weeks. PJM used Maitland s mobilization method to apply joint mobilization with talus in the posterior direction and AJM used an angular joint motion to induce patient s voluntary motion of medial malleolus anterior gliding and lateral malleolus posterior gliding, respectively. DFROM of the ankle was measured by using tape and DBA was evaluated by using the balance system. Results: Significant improvement was observed after intervention in both the PJM and AJM groups except for the DBA-anterior and DBA-right variables of the PJM group. There were statistically significant differences between the AJM and PJM groups in the DFROM, DBA-anterior, DBA-posterior, and DBA-right variables. Conclusions: The overall improvement of DFROM and DBA was found to be more effective in joint mobilization including voluntary movement. When it is accompanied by voluntary movement, it further affects the neuromuscular system of the ankle.
A Sub-1.0-V On-Chip CMOS Thermometer With a Folded Temperature Sensor for Low-Power Mobile DRAM
Hyunjoong Lee,Daeyong Shim,Cyuyeol Rhee,Mino Kim,Suhwan Kim IEEE 2016 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 2 E Vol.63 No.6
<P>As Dynamic Random Access Memory (DRAM) supply voltages drop below 1 V with the scaling down of the process, it becomes increasingly difficult to construct a temperature sensor with sufficient accuracy to control self-refresh, without occupying significant area or consuming increased power. In this brief, we propose an on-chip CMOS thermometer with a temperature sensor, the output of which is divided into segments by a folding scheme. The slopes of these segments can be arranged to be the same or adjusted separately, as desired for the output. Implemented in a 29-nm DRAM process, the sensor operates from -40 degrees C to 95 degrees C at the supply voltage of 0.8 V, with a temperature sensitivity of -3.1 mV/degrees C between -40 degrees C and 35 degrees C, and -2.1 mV/degrees C between 35 degrees C and 95 degrees C. It has an area of 0.0016 mm(2) and consumes less than 0.144 mu W.</P>
Design and Analysis of a Solar-Power Mini-UAV for Extended Endurance at Low Altitude
Hyunjoong Ahn,Jon Ahn 한국항공우주학회 2019 International Journal of Aeronautical and Space Sc Vol.20 No.2
A solar-powered mini-UAV has been designed for long-endurance performance at low altitude, reflecting practical constraints from preceding experience of authors. The parametric analysis of the solar-power propulsion system is the primary interest of the present study, along with the power requirement estimation of the aircraft design. To cope with the wide range of flight speed, low-Reynolds number airfoils are selected, which possesses low drag characteristics at wide range of angle of attack. Aerodynamic design studies point out that maintaining Reynolds number above 100,000 is a requisite for extended flight operations of the solar-powered mini-UAV. The itemized drag prediction of the UAV design is performed based on the Xflr5 analysis of the UAV configuration. The solar modules and battery systems of the UAV design are represented as equivalent electric models, for the performance simulation of the solar-power propulsion system. Rigorous analyses on the seasonal solar radiation indicate that the capacity of the battery pack should be increased over 50% of the current design to provide continuous operation of the mini-UAV up to 60 days.
Charge Amplifier With an Enhanced Frequency Response for SPM-Based Data Storage
Hyunjoong Lee,Jong-Kwan Woo,Hyo-Jin Nam,Won-Hyeog Jin,Moongi Jeong,Young-Sik Kim,Jin-Koog Shin,Suhwan Kim IEEE 2010 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 2 E Vol.57 No.9
<P>Storage systems based on scanning probe microscopy incorporate an array of thermopiezoelectric cantilevers that require charge amplifiers with a wide frequency response but low power consumption. We use an improved frequency compensation method to enhance the in-band frequency response without requiring any additional power. Measurements show that the prototype chip draws the same 68 A at 1.8 V as an unmodified design but has a closed-loop frequency response that is ten times greater. The chip was fabricated in a 0.18-m standard CMOS process, and the charge amplifier core occupies 0.042 mm<SUP>2</SUP>.</P>
Hybrid method for parameter optimization with equality constraints
Kim, Hyunjoong,Park, Moonsu,Tahk, Min-Jea Taylor Francis 2016 Engineering optimization Vol.48 No.12
<P>This article presents a hybrid method developed for solving an equality-constrained optimization problem. This method combines the co-evolutionary augmented Lagrangian method with the hybrid evolution strategy technique to overcome two major disadvantages of the evolutionary algorithm, i.e. poor constraint handling and a low convergence rate. Parameter and multiplier groups are evolved simultaneously to solve a zero-sum game transformed from a parameter optimization problem with equality constraints by the augmented Lagrangian method. Gradient individuals of parameters and multipliers are propagated by Newton's method, and they play an important role in accelerating the speed of convergence. Ten test problems are solved to indicate that the proposed hybrid method supplies more accurate solutions with faster convergence than the co-evolutionary augmented Lagrangian method.</P>