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HELLP syndrome in a pregnant patient with Gitelman syndrome
( Minhyeok Lee ),( Dong-il Kim ),( Kyung-ho Lee ),( Jun-hyun Byun ),( Jiyong Hwang ),( Won-min Hwang ),( Sung-ro Yun ),( Se-hee Yoon ) 대한신장학회 2017 Kidney Research and Clinical Practice Vol.36 No.1
Gitelman syndrome is characterized by hypokalemia, metabolic alkalosis, hypocalciuria, and hypomagnesemia. The clinical course of Gitelman syndrome in pregnant women remains unclear, but it is thought to be benign. We report here the first Korean case of atypical eclampsia in a 31-year-old who was diagnosed with Gitelman syndrome incidentally during an antenatal screening test. The patient did well during pregnancy despite significant hypokalemia. At 33 weeks` gestation, the patient exhibited eclampsia, hemolysis, elevated liver enzymes, low platelets (HELLP) syndrome, and renal insufficiency without significant hypertension or proteinuria. We explain this unusual clinical course through a review of the relevant literature.
Circuit Driving of RC Scale Cars using Reinforcement Learning
Minhyeok Kwon,Yongsoon Eun 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
This paper presents control of an RC scale car in a scale circuit using reinforcement learning. Experimental environment has been constructed with 1/27 scale remote controlled car, motion tracking system, and a computer that sends steering and thrust commands to the RC car based on feedback from the motion tracking system. The control consists of two layers. Low-level controller receives a desired velocity vector as a reference and do a basic PI control for thrust and P control for steering. High-level controller is trained by reinforcement learning that receives the car state and outputs the velocity command vector. The state include position, velocity, heading of the RC car, distances to surrounding boundaries of the circuit. The high-level controller takes the form of a recursive neural network, which is trained entirely in virtual environment. The car dynamics in the virtual environment is a bicycle model that includes tire slip force from the literature. With the resulting policy (high-level controller) the RC car successfully completes 10 laps in the actual environment of the circuit without colliding to the boundaries.
Arm Lifting Exercises for Lower Trapezius Muscle Activation
Minhyeok Kang 국제물리치료연구학회 2019 Journal of International Academy of Physical Ther Vol.10 No.4
Background: Lower trapezius muscle function is important for the prevention and treatment of shoulder injuries. However, scapular posterior tilt movement has been overlooked in lower trapezius strengthening exercise programs. Objective: To examine the effects of prone arm lifting with scapular posterior tilt (PALSPT) on trapezius muscles. Design: Crossover study Methods: 17 healthy males were recruited for participation in this study. Participants performed backward rocking diagonal arm lifting (BRDAL) and PALSPT. To train participants in scapular posterior tilt movements for PALSPT, visual biofeedback of scapular movements was provided using a motion sensor. Electromyography (EMG) activities of the middle and lower trapezius were recorded using a surface EMG system. Differences in middle and lower trapezius muscle activity between BRDAL and PALSPT exercises were analyzed. Results: Lower trapezius muscle activity was significantly greater during PALSPT than during BRDAL (p=.006). Although greater EMG activity was observed in the middle trapezius during PALSPT than during BRDAL, this difference was not significant (p=.055). Conclusions: The results of the present study indicate that scapular posterior tilt movements must be considered in lower trapezius muscle strengthening programs.
Minhyeok Kang 국제물리치료연구학회 2021 Journal of International Academy of Physical Ther Vol.12 No.3
Background: Although it has been reported that both self-myofascial release (SMR) with foam rolling (FR) and active static hamstring stretching (e.g., jackknife stretching) are effective in improving hamstring flexibility, no study has compared the effects of these exercises. Objectives: To compare the effects of SMR with FR and jack-knife stretching on hamstring flexibility. Design: A Randomized controlled trial. Methods: Subjects with hamstring tightness were divided into the SMR with the FR group (n=12) and the jack-knife stretching group (n=12). Subjects groups performed SMR with FR or jack-knife stretching according to group assignment. To identify changes in hamstring flexibility, the finger-to-floor distance (FFD) test, active knee extension (AKE) test, and passive straight leg raising (PSLR) test were performed at pre- and post-exercise. Results: Significant increases occurred in knee extension angle during the AKE test and hip flexion angle during the PSLR test after exercise in both groups (P<.001). Additionally, FFD and anterior pelvic tilt during the FFD test significantly increased (P<.001); however, we observed no significant interaction and main effects for the groups (P>.05). Conclusion: Both SMR with FR and jack-knife stretching are effective in improving hamstring flexibility in subjects with hamstring tightness.
Minhyeok Lee,Ji Hye Kim,정인범,Ji Woong Son,Moon Jun Na,권선중 대한중환자의학회 2019 Acute and Critical Care Vol.34 No.1
Background:Use of a high-flow nasal cannula (HFNC) reduced postextubation respiratory failure (PERF) and reintubation rate compared to use of a low-flow oxygen system (LFOS) in low-risk patients. However, no obvious conclusion was reached for high-risk patients. Here, we sought to present the current status of HFNC use as adjunctive oxygen therapy in a clinical setting and to elucidate the nature of the protective effect following extubation. Methods:The medical records of 855 patients who were admitted to the intensive care unit of single university hospital during a period of 5.5 years were analyzed retrospectively, with only 118 patients ultimately included in the present research. The baseline characteristics of these patients and the occurrence of PERF and reintubation along with physiologic changes were analyzed. Results:Eighty-four patients underwent HFNC, and the remaining 34 patients underwent conventional LFOS after extubation. Physicians preferred HFNC to LFOS in the face of highrisk features including old age, neurologic disease, moderate to severe chronic obstructive pulmonary disease, a long duration of mechanical ventilation, low baseline arterial partial pressure of oxygen to fraction of inspired oxygen ratio, and a high baseline alveolar–arterial oxygen difference. The reintubation rate at 72 hours after extubation was not different (9.5% vs. 8.8%; P=1.000). Hypoxic respiratory failure was slightly higher in the nonreintubation group than in the reintubation group (31.9% vs. 6.7%; P=0.058). Regarding physiologic effects, heart rate was only stabilized after 24 hours of extubation in the HFNC group. Conclusions:No difference was found in the occurrence of PERF and reintubation between both groups. It is worth noting that similar PERF and reintubation ratios were shown in the HFNC group in those with certain exacerbating risk factors versus not. Caution is needed regarding delayed reintubation in the HFNC group.
A Power-Aware Scalable Pipelined Multiply-Accumulate Unit with Dadda Reduction Network
Minhyeok Shin,Hanho Lee 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
An energy-efficient power-aware design is highly desirable for digital signal processing (DSP) functions that encounter a wide diversity of operating scenarios in battery-powered wireless sensor network systems. Addressing this issue, this paper presents a lowpower power-aware scalable pipelined multiply-accumulate (PA-MAC) unit that makes use of dynamic-range detection unit, sharing common functional units, a 16-bit Dadda reduction network with error compensation circuit, a 8-bit Wallace tree and a 4-bit array-based adder-tree for DSP applications.