• 융합신호처리학회논문지
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• 제16권2호
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• pp.35-39
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• 2015

Auditory and visual stimuli presented in the peripheral visual field were perceived as spatially coincident when the auditory stimulus was presented five to seven degrees outwards from the direction of the visual stimulus. Furthermore, judgments of the perceived distance between auditory and visual stimuli presented in the periphery did not increase when an auditory stimulus was presented in the peripheral side of the visual stimulus. As to the origin of this phenomenon, there would seem to be two possibilities. One is that the participants could not perceptually distinguish the distance on the peripheral side because of the limitation of accuracy perception. The other is that the participants could distinguish the distances, but could not evaluate them because of the insufficient experimental setup of auditory stimuli. In order to confirm which of these two alternative explanations is valid, we conducted an experiment similar to that of our previous study using a sufficient number of loudspeakers for the presentation of auditory stimuli. Results revealed that judgments of perceived distance increased on the peripheral side. This indicates that we can perceive discrimination between audio and visual stimuli on the peripheral side.

• Journal of Yeungnam Medical Science
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• 제31권2호
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• pp.152-156
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• 2014

We report on a patient who showed visual recovery following bilateral occipital lobe infarct, as evaluated by follow up functional magnetic resonance imaging (fMRI) and diffusion tensor tractography (DTT). A 56-year-old female patient exhibited severe visual impairment since onset of the cerebral infarct in the bilateral occipital lobes. The patient complained that she could not see anything, although the central part of the visual field remained dimly at 1 week after onset. However, her visual function has shown improvement with time. As a result, at 5 weeks after onset, she notified that her visual field and visual acuity had improved. fMRI and DTT were acquired at 1 week and 4 weeks after onset, using a 1.5-T Philips Gyroscan Intera. The fiber number of left optic radiation (OR) increased from 257 (1-week) to 353 (4-week), although the fiber numbers for right OR were similar. No activation in the occipital lobe was observed on 1-week fMRI. By contrast, activation of the visual cortex, including the bilateral primary visual cortex, was observed on 4-week fMRI. We demonstrated visual recovery in this patient in terms of the changes observed on DTT and fMRI. It appears that the recovery of the left OR was attributed more to resolution of local factors, such as peri-infarct edema, than brain plasticity.

• 디지털융복합연구
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• 제20권4호
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• pp.321-331
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• 2022

최근 중국 시각디자인 분야 기업들은 학교인재 양성의 질적 저하, 졸업생의 개인 능력은 기업의 요구를 만족시킬 수 없는 문제를 반영하고 있다. 이를 해결하기 위해서는 선진국처럼 완전한 시각디자인 분야 NCS 제도가 필요하다. 따라서 본 연구의 목적은 학생의 자기 평가, 기업의 직업 요구, 학교 교육 방식 세 가지 측면에서 분석하고 한국 시각디자인 분야의 국가직업능력표준을 참고해 중국 시각디자인 분야의 직업능역표준을 개발하는 것이다. 연구방법은 한국 시각디자인 분야의 국가직업표준을 바탕으로 중국 장쑤성 S 대학의 시각디자인학과 교육제도를 분석하고 시각디자인학과 졸업생들을 대상으로 설문조사를 실시하는 한편 중국 시각디자인회사의 직업요건을 참고해 중국 시각디자인 분야의 국가직업표준을 개발하는 것이다. 이를 분석해서 연구결과는 중국 시각디자인 분야 국가직업능력표준의 개발방안을 제시하였다.

• 대한중풍순환신경학회지
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• 제23권1호
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• pp.65-72
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• 2022

■Background Overall prevalence of visual field loss after stroke was estimated at 31%, ranged from 5.5- 57%. Among them, homonymous hemianopia is the most common symptom of post-stroke visual field loss and leads to a decrease in the quality of life and therapeutic effect. However, standard treatment has not been established. ■Case report A 48-year-old male with right side homonymous hemianopia by a left occipital-parietal lobe hemorrhage was treated with Qu-Ji-Du-Huang-Wan, acupuncture and electroacupuncture for 20 days. We used confrontation visual field exam, automated perimetry and visual analog scale for evaluating symptoms. Following treatment, confrontation visual field exam and the subjective discomfort was improved. ■Conclusions The present case report suggests that combined Korean medicine treatment might be an effective treatment of post-stroke homonymous hemianopia. A number of follow up studies should be conducted to clarify the effectiveness of treatment.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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• pp.433-438
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• 1999

The land use type of Korea is high-density. So, the image classification using coarse resolution satellite image may not provide land cover classification results as good as expected. The purpose of this paper is to compare the result of visual interpretation with that of digital image classification of 20 m resolution SPOT satellite image at Kwangju-eup, Kyunggi-do, Korea. Classes are forest, cultivated field, pasture, water and residential area, which are clearly discriminated in visual interpretation. Maximum likelihood classifier was used for digital image classification. Accuracy assessment was done by comparing each classification result with ground truth data obtained from field checking. The classification result from the visual interpretation presented an total accuracy 9.23 percent higher than that of the digital image classification. This proves the importance of visual interpretation for the area with high density land use like the study site in Korea.

• Journal of Korean Neurosurgical Society
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• 제42권3호
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• pp.216-219
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• 2007

Lymphocytic hypophysitis is a clinically rare disease, and it has been known to be an autoimmune disease which mainly affects pregnant women at the end of gestation or right after delivery. The authors experienced a case of lymphocytic hypophysitis in a 29-year-old pregnant woman with rapid progressing visual disturbance. Sella MRI showed a mass-like lesion of hypophysis and hypertrophy of pituitary stalk with evidences of hypopituitarism. Cesarean section was done and then TSA was performed. The pathologic diagnosis was lymphocytic hypophysitis. After TSA, visual acuity was improved and visual field defect was recovered. She was given thyroid hormone replacement therapy because of transient partial hypopituitarism for 6 months after surgery. One must consider the probability of lymphocytic hypophysitis, if there are alteration of visual acuity and visual field defect which aggravate rapidly during pregnancy due to mass effect, decreased serum hormonal levels shown in hypopituitarism and sella MRI findings of hypertrophy of pituitary stalk and enlargement of pituitary gland.

• 컴퓨터교육학회논문지
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• 제11권4호
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• pp.47-58
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• 2008

본 연구의 목적은 웹 기반 학습 환경에서 학습자의 인지양식과 시각적 조직자 (visual organizer) 유형이 전자텍스트 문서에 대한 내용이해 및 구조파악에 어떠한 영향을 미치는지 밝히고자 하는 것이다. 연구를 위하여 대구에 소재한 A 대학교에 재학 중인 126 명을 대상으로, 인지양식검사 결과에 따라 장의존 및 장독립적 인지양식 집단을 구성한 후 각 집단에 '단순축소' 형태와 '추상화' 형태, 두 가지 유형의 시각적 조직자가 포함된 웹 기반 학습 프로그램을 처치하여 결과를 분석하였다. 그 결과, 전자 텍스트 내용이해에 있어서 학습자의 인지양식 및 시각적 조직자 유형은 각각 텍스트 내용이해에 유의미한 영향을 주지 않았으나 텍스트 구조 파악에 있어서 장독립적 학습자가 장의존적 학습자에 비해 전자 텍스트 문서의 구조를 더 잘 파악하는 것으로 나타났다. 인지양식과 시각적 조직자는 구조파악에 대해 상호작용효과가 있는 것으로 나타났는데, 장의존적 학습자는 추상화 형태를 사용했을 때, 장독립적 학습자는 단순축소형태를 사용했을 때, 텍스트 구조파악이 더 효과적인 것으로 나타났다.

• 한국멀티미디어학회논문지
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• 제17권11호
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• pp.1345-1353
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• 2014

In a situation where the demand for creative talent creating new values and ideas is increasing day by day in the 21st century, students dealing with technology in the IT field have quite insufficient communication skills of materializing ideas and logically visualizing them. Therefore, the importance of systematic means of expression and methodology that can convey ideas more effectively and sensitively in the IT field is increasing. In this study, we recognized the importance of idea visualization education in the IT field by reviewing the relevant theory and examining creative thinking system cases and sought a more systematic visual communication method by investigating the awareness on creative thinking and expression. The results obtained in this study are considered to not only provide academic value as basic research in building new education programs in the IT sector in the future but be an opportunity for further research associated with creative talent training.

• Journal of Korean Neurosurgical Society
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• 제29권6호
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• pp.815-821
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• 2000

Parasplenial arteriovenous malformations(AVMs) are rare vascular malformations which have distinct clinical and anatomical features. They are situated at the confluence of the hippocampus, isthmus of the cingulate gyrus and the gyrus occipitotemporalis medialis. These lesions are anterior to the calcarine sulcus and their apex extends towards the medial surface of the trigonum. Posterolaterally, these lesions are in close proximity to the visual cortex and optic radiation. The objectives in the surgery of parasplenial AVMs are complete resection of the lesions and preservation of vision. These objectives must be achieved with comprehensive understanding of the following anatomical features :1) the deep central location of the lesions within eloquent brain tissue ; 2) the lack of cortical representation of the AVMs that requires retraction of visual cortex ; 3) deep arterial supply ; 4) deep venous drainage ; 5) juxtaposition to the choroid plexus with which arterial supply and venous drainage are shared. A 16-year-old female student presented with intraventricular hemorrhage from a right parasplenial-subtrigonal AVM. The lesion, fed by posterior cerebral artery and drained into the vein of Galen, was successfully treated by the inter-hemispheric parietooccipital approach. To avoid visual field defect a small incision was made on precuneus anterior to the calcarine sulcus. In this report, the authors describe a surgical approach with special consideration on preservation of visual field.

• 한국임상약학회지
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• 제29권2호
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• pp.133-137
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• 2019

Atorvastatin is one of the most widely prescribed medications for dyslipidemia treatment. In Korea, post combined therapy with ezetimibe, a 73-year-old woman was reported by a community pharmacy to have experienced visual field defect, which recovered after drug discontinuation. She had never experienced this symptom before, and several studies have reported an association between use of statins and visual disorders such as blurred vision, diplopia, and cataract. Blockage of cholesterol accumulation, oxidative stress, or myopathy is expected to be a cause of this symptom. Naranjo scale, Korean causality assessment algorithm (Ver.2), and World Health Organization-Uppsala Monitoring Center (WHO-UMC) criteria were the three tools used to determine causality between the visual disorder and atorvastatin. The results represent 'probable', 'certain', and 'probable/likely' causality, respectively. Our results, in combination with a review of literature, indicate that ocular adverse effects are highly likely related to atorvastatin.