检索结果-南通市图书馆

Reorganization of corticospinal tract in a patient with posterior limb infarct of the internal capsule

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2011年第4期6卷 313-316页

作者： Sang Seok Yeo Sung ho jang Department of Rehabilitation Science Graduate SchoolDaegu UniversityDaegu 705-717Republic of Korea Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityDaegu 705-717Republic of Korea

Several diffusion tensor-imaging studies have demonstrated motor recovery mechanisms in stroke patients with subcortical infarct, including the corona radiata, pons, and medulla. however, studies of motor recovery mechanisms have not been reported in patients with posterior limb infarcts of the intemal capsule. The present study reports on a 77-year-old man with complete paralysis of the left extremities at stroke onset. At 6 months after onset, motor function of the left extremities recovered to a nearly normal state. The 3-week diffusion tensor tractography of the affected （right） hemisphere showed that corticospinal tract discontinued below the posterior limb. In contrast, 6-month diffusion tensor tractography revealed that the right corticospinal tract originated from the precentral gyrus and descended along the anterior area of the infarcted posterior limb. Motor function of the affected extremities was reorganized into the anterior area of the posterior limb infarct.

关键词： diffusion tensor imaging functional MRI corticospinal tract cerebral infarct posterior limb of the internal capsule

Improvement of ataxia in a patient with cerebellar infarction by recovery of injured cortico-ponto-cerebellar tract and dentato-rubro-thalamic tract: a diffusion tensor tractography study

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2019年第8期14卷 1470-1472页

作者： Sung ho jang Hyeok Gyu Kwon Department of Physical Medicine and Rehabilitation College of Medicine Yeungnam University Daegu Republic of Korea Department of Physical Therapy College of Health Science Eulji University Gyeonggi Republic of Korea

Coordinated movement is generated by communication between the cerebrum and cerebellum via the cerebellar peduncles (CPs). The CPs are classified into three types (superior, middle, and inferior), and each includes a variety of neural tracts. Among those tracts, the cortico-ponto-cerebellar tract (CPCT), a middle CP, is involved in motor planning and initiation of movement, while the dentato-rubro-thalamic tract (DRTT), a superior CP, is involved in motor coordination, movement timing, verbal fluency, and working memory (Kase et al., 1993.

关键词： Improvement of ataxia injured cortico-ponto-cerebellar tractography study

Aberrant pyramidal tract in a patient with corona radiata infarct A diffusion tensor tractography study

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2011年第13期6卷 1027-1030页

作者： Ji Heon hong Sung ho jang Department of Physical Therapy Yeungnam College of Science & TechnologyNamkuDaegu 705-703Republic of Korea Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityDaegu 705-717Republic of Korea

The aberrant pyramidal tract refers to the collateral pathway of the pyramidal tract through the medial lemniscus in the brainstem. A 63-year-old male patient presented with severe paralysis of the left extremities due to a right corona radiata infarct. He was able to extend the affected fingers against resistance at 2 months after stroke onset. At 6 months after stroke onset, he was able to perform some fine motor activities, as well as to walk with a nearly normal gait. Functional MRI, which was performed at 6 months after onset, showed that the contralateral primary sensorimotor cortex was activated during affected （left） hand movements. Diffusion tensor tractography results showed that at 2 weeks after stroke onset, pyramidal tracts of the affected hemisphere originated from the primary motor cortex and descended along the known pathway of the pyramidal tract with an aberrant pyramidal tract, which was bypassed through the medial lemniscus from the midbrain to the lower pons. however, the pyramidal tract from midbrain to pons in the affected hemisphere could not be depicted by diffusion tensor tractography at 6 months after stroke onset; instead, only the aberrant pyramidal tract existed for the course of the disappeared pyramidal tract. Results from this study indicate that the main motor functions of the affected extremities appeared to be controlled via the aberrant pyramidal tract with degeneration of the pyramidal tract in the brainstem of the affected hemisphere.

关键词： diffusion tensor tractography pyramidal tract aberrant pyramidal tract motor recovery cerebral infarct

Question-Answering Pair Matching Based on Question Classification and Ensemble Sentence Embedding

在线全文

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2023年第9期46卷 3471-3489页

作者： jae-Seok jang Hyuk-Yoon Kwon Department of Computer Science and Engineering Seoul National University of Science and TechnologySeoul01811Korea Department of Industrial Engineering/Graduate School of Data Science Seoul National University of Science and TechnologySeoul01811Korea

Question-answering(QA)models find answers to a given *** necessity of automatically finding answers is increasing because it is very important and challenging from the large-scale QA data *** this paper,we deal with the QA pair matching approach in QA models,which finds the most relevant question and its recommended answer for a given *** studies for the approach performed on the entire dataset or datasets within a category that the question writer manually *** contrast,we aim to automatically find the category to which the question belongs by employing the text classification model and to find the answer corresponding to the question within the *** to the text classification model,we can effectively reduce the search space for finding the answers to a given ***,the proposed model improves the accuracy of the QA matching model and significantly reduces the model inference ***,to improve the performance of finding similar sentences in each category,we present an ensemble embedding model for sentences,improving the performance compared to the individual embedding *** real-world QA data sets,we evaluate the performance of the proposed QA matching *** a result,the accuracy of our final ensemble embedding model based on the text classification model is 81.18%,which outperforms the existing models by 9.81%∼14.16%***,in terms of the model inference speed,our model is faster than the existing models by 2.61∼5.07 times due to the effective reduction of search spaces by the text classification model.

关键词： Question-answering text classification model data augmentation text embedding

Recovery of a degenerated corticospinal tract after injury in a patient with intracerebral hemorrhage:confirmed by diffusion tensor tractography imaging

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2015年第5期10卷 829-831页

作者： You Sung Seo Sung ho jang Department of Physical Medicine and Rehabilitation College of MedicineYeungnam University

The corticospinal tract （CST） is a major neuronal tract of motor function in the human brain （York, 1987; Davidoff, 1990; jang, 2014）. Recovery of an injured CST is one of the motor recovery mechanisms in stroke patients （Hendricks et al., 2003; jang et al., 2006, 2007; Swayne et al., 2008; Kwon et al., 2011, 2013; Kwon and jang, 2012; Yeo and jang, 2013; Rong et al., 2014）. Diffusion tensor tractography （DTT）, derived from diffusion tensor imaging （DTI）, and transcra- nial magnetic stimulation （TMS） have been widely used in demonstrating the recovery of an injured CST （Hendricks et al., 2003; jang et al., 2006, 2007; Swayne et al., 2008; Pannek et al., 2009; Kwon et al., 2011, 2013; Kwon and jang, 2012; Yeo and jang, 2013; Rong et al., 2014）. DTT has the advan- tage of enabling visualization of the architecture and integ- rity of the CST at the subcortical level in three dimensions （Mori et al., 1999; Kunimatsu et al., 2004）.

关键词： Recovery of a degenerated corticospinal tract after injury in a patient with intracerebral hemorrhage CST DTT ICH TMS

Corticospinal tract recovery in a patient with traumatic transtentorial herniation

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2013年第5期8卷 469-473页

作者： Sang Seok Yeo Sung ho jang Department of Physical Medicine and Rehabilitation College of Medicine Yeungnam University

Transtentorial herniation is one of the causes of motor weakness in traumatic brain injury. In this study, we report on a patient who underwent decompressive craniectomy due to traumatic intracerebral hemorrhage. Brain CT images taken after surgery showed intracerebral hemorrhage in the left fronto-temporal lobe and left transtentorial herniation. The patient presented with severe paralysis of the right extremities at the time of intracerebral hemorrhage onset, but the limb motor function recovered partially at 6 months after onset and to nearly normal level at 27 months. Through diffusion tensor tractography, the left corticospinal tract was disrupted below the cerebral peduncle at 1 month after onset and the disrupted left corticospinal tract was reconstructed at 27 months. These findings suggest that recovery of limb motor function in a patient with traumatic transtentorial herniation can come to be true by recovery of corticospinal tract.

关键词： neural regeneration neuroimaging diffusion tensor imaging diffusion tensor tractography ttanscranial magnetic stimulation traumatic brain injury intracerebral hemorrhage transtentorfa herniation corticospinal tract motor paralysis neuroimaing grants-supported paper photographs-containing paper neuroregeneration

Motor recovery via aberrant pyramidal tract in a patient with traumatic brain injury A diffusion tensor tractography study

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2013年第1期8卷 90-94页

作者： Sang Seok Yeo Sung ho jang Department of Physical Medicine and Rehabilitation College of Medicine Yeungnam University

The aberrant pyramidal tract is the collateral pathway of the pyramidal tract through the medial lemniscus in the brainstem. A 21-year-old man presented with right hemiparesis due to a traumatic intracerebral hemorrhage in the left corona radiata. His motor function recovered almost to the normal state at 10 months after onset. Through diffusion tensor tractography, the pyramidal tract in the affected （left） hemisphere showed discontinuation at the pontine level at 13 months after onset. An aberrant pyramidal tract was observed, which originated from the primary motor cortex and the supplementary motor area and descended through the corona radiata, then through the posterior limb of the internal capsule and the medial lemniscus pathway from the midbrain to the pons, finally entered into the pyramidal tract area at the pontomedullary junction, it suggests that the motor functions of the right extremities in this patient had recovered by this aberrant pyramidal tract.

关键词： neural regeneration neuroimaging diffusion tensor imaging diffusion tensor tractography transcranial magnetic stimulation pyramidal tract aberrant pyramidal tract motor paralysis motorrecovery traumatic brain injury head trauma intracerebral hemorrhage grant-supported paper photographs-containing paper neuroregeneration

Perspectives on the neural connectivity of the fornix in the human brain

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2014年第15期9卷 1434-1436页

作者： Sung ho jang Hyeok Gyu Kwon Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityTaeguRepublic of Korea

The fornix is involved in the transfer of information on episodic memory as a part of the Papez circuit. Diffusion tensor imaging enables to estimate the neural connectivity of the fornix. The anterior fornical body has high connectivity with the anterior commissure, and brain areas rele- vant to cholinergic nuclei （septal forebrain region and brainstem） and memory function （medial temporal lobe）. In the normal subjects, by contrast, the posterior fornical body has connectivity with the cerebral cortex and brainstem through the splenium of the corpus callosum. We believe that knowledge of the neural connectivity of the fornix would be helpful in investigation of the neural network associated with memory and recovery mechanisms following injury of the fornix.

关键词： fornix neural connectivity diffusion tensor imaging anterior commissure corpus callo-sum cholinergic nucleus

Perilesional reorganization of somatosensory function following traumatic cortical contusion A case report

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2011年第11期6卷 830-833页

作者： Mi Young Lee Sung ho jang Department of Physical Therapy College of Health and Therapy Daegu Haany University Daegu Republic of Korea Department of Physical Medicine and Rehabilitation College of Medicine Yeungnam University Daegu 705-717 Republic of Korea

The present study reports on a 23-year-old male patient with somatosensory dysfunction of the left hand following cortical contusion. His somatosensory dysfunction recovered to a nearly normal state at 6 months after injury. Functional MRI results demonstrated that the contralateral primary sensorimotor cortex centered on the primary somatosensroy cortex was activated during touch stimulation of the patient＇s right hand and either hand of control subjects. By contrast, the anterior area of the lesion centered on the precentral knob in the right hemisphere was activated during touch stimulation of the left hand. These findings show that the somatosensory function of the affected hand appears to have been recovered by the somatosensory cortex reorganizing into the anterior area of the contused primary somatosensory cortex.

关键词： stroke somatosensory recovery brain mapping brain plasticity brain injury functional MRI neural regeneration