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주의력결핍 과잉행동장애 하위 유형별 연속수행과제 양상의 예비 연구
허승은(Seung Eun Huh),김용희(Young Hee Kim),반건호(Geon Ho Bahn),이원혜(Won Hye Lee) 대한소아청소년정신의학회 2008 소아청소년정신의학 Vol.19 No.2
Objectives : The purpose of this study was to compare two subtypes of attention-deficit hyperactivity disorder (ADHD) and controls in their attention using ADHD diagnostic system (ADS), a kind of continuous performance test. Methods : Subjects of this study were 8 children with ADHD-predominantly inattentive type, 28 children with ADHD-combined type and 20 control children. Ages ranged from 5 to 14 years. The Korean Educational Development Institute version of the Wechsler Intelligence Scale for Children (KEDI-WISC) and the ADS were administered to all subjects to provide measures of intelligence and attention. Results : Significant differences were found in the ADS variables for the three groups. When compared with controls, the ADHD-predominantly inattentive type children scored significantly higher on the omission error at middle stage and later stage and ADHD-combined type children scored significantly higher on the omission error and reaction time at later stage. When compared with the other two groups, the ADHD-combined type children scored significantly higher on the commission error at all three stages. Conclusion : Our results suggest that the two subtypes of ADHD have different features in attention deficit. And there was a possibility that commission error is available variable to show cognitive characteristics of ADHD-combined type than any other ADS variables. Further studies are needed to evaluate this finding.
The Role of Information Search Cost on Seller's Disclosure of Negative Information
허승,Huh, Seung Convergence Society for SMB 2021 융합정보논문지 Vol.11 No.4
This study has attempted to provide an important understanding about the information asymmetry in markets through empirical analysis on how the disclosure of low quality can increase demand even in the short run. More specifically, this study has extended the previous findings from the related literature by considering the effect of information search cost and providing empirical evidences about the effect of voluntary disclosure of low quality, using an experimental method with purchase scenarios. The results from our analysis show that reduced perceived risk have an important effect on sharing negative information, while the effect of information search cost is minimal. We also explain the circumstances whereby the information disclosure of a seller with low-quality product can enhance not only the seller's profitability but also customers' welfare by increasing the market demand and the demand for the seller claiming high quality. 본 논문은 부정적 정보의 공개가 어떻게 단기간에 판매자의 수요를 증대시킬 수 있는지에 대한 경험적 분석을 통해 시장의 정보 불균형에 대한 중요한 이해를 제공하고자 한다. 이를 위해 본 연구는 기존의 관련 연구 결과에 더하여 정보 검색 비용이 부정적 정보 공개에 미치는 영향을 예측하고, 이러한 해석에 대하여 가상의 시장 거래를 통한 실험적 분석을 실시한다. 본 연구의 결과는 구매 위험도가 부정적 정보 검색에 중요한 역할을 하고 있는 반면 정보 검색 비용의 효과는 크지 않음을 나타내며, 특히 실험의 결과는 저품질의 제품을 판매하는 판매자가 어떻게 정보 공개를 통해 자신의 수익성 뿐 아니라 시장과 경쟁 제품의 수요를 증대시켜서 소비자 효용을 증대시킬 수 있는지를 보여준다.
허승,전용순,박귀원,김우기,Huh, Seung,Chun, Yong-Soon,Park, Kwi-Won,Kim, Woo-Ki 대한소아외과학회 1995 소아외과 Vol.1 No.2
Since 1988, we have performed esophageal replacement with the reversed gastric tube on four esophageal atresia patients. Three patients had long-gap esophageal atresias and one patient had recurrent tracheoesophageal fistula that was previously operated on three times. One combined imperforate anus. The youngest patient was 6-month-old and the oldest, 34-month-old at the time of procedure. The technique of gastric tube construction is described. There have been both major and minor complications. Although two patients had shown distal tube strictures as late complications. those were solved with tuboplasties on 29 months and 48 months, postoperatively. Growth and development have been acceptable in all four patients, although most remain in the lower percentiles for growth and height, a condition that usually predates the esophageal substitution. Conclusively, reversed gastric tube interposition has proved very satisfactory for long-gap esophageal atresia that cannot be anastomosed primarily even by spiral myotomy and esophageal atresia with recurrent tracheoesophageal fistula having destroyed esophagus due to previous operation.
인지기능이 정상인 노인에게서 주관적 기억력 저하의 위험요인
허승(Seung Huh),이정재(Jung Jae Lee),이석범(Seok Bum Lee),홍민하(Minha Hong),이경규(Kyung Kyu Lee),백기청(Ki Chung Paik) 대한노인정신의학회 2014 노인정신의학 Vol.18 No.2
Objective:We examined the risk factors for subjective memory impairment in cognitively normal elderly. Methods:One hundred fifty five cognitively normal elderly individuals with subjective memory impairment and 126 normal control subjects without subjective memory impairment were selected. All participants underwent clinical evaluation for dementia and clinical psychiatric disorder conformed to the Korean version of the Consortium to Establish a Registry for Alzheimer’s Disease Assessment Packet and Korean version of Mini-International Neuropsychiatric Interview, respectively. Korean version of Geriatric Depression Scale-Revised was administered to evaluate depression. Subjective memory impairment was defined as 1) subjective memory complaint by the participant and/or the informants and 2) evidence of memory impairment. Results:Depression [odds ratio (OR)=1.07, 95% confidence interval (CI)=1.03-1.10] and female (OR=2.27, 95% CI=1.17- 4.39) significantly increased the risk of subjective memory impairment in cognitively normal elderly. Conclusion:Depression can be a risk factor of subjective memory impairment in cognitively normal elderly. The clinicians should be vigilant regarding the presence of depression when assessing the subjects with subjective memory complaint.
하지정맥류 환자의 정맥벽에서 정수압 스트레스에 따른 기질 금속단백분해효소 발현도 분석
허승(Seung Huh),최향희(Hyang Hee Choi),김형기(Hyung-kee Kim) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.77 No.5
Purpose: The expression of matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinase (TIMPs) caused by hydrostatic pressure stress is important in the development of varicose veins (VVs). This study was performed to analyse the expression of various MMPs and TIMPs according to the hydrostatic stress and the anatomical level of human great saphenous vein (GSV). Methods: Forty-nine vein samples were obtained from 10 patients with VVs (control group), and 34 samples from 7 VV patients after 1-hour hydrostatic stress just before surgery (stress group) at each anatomical site (proximal, Hunter, Dodd, and Boyd perforators) of GSV. Light microscopic examination and immunohistochemistry for MMP-1, -2, -9, -13 and TIMP-1, -2 were performed. Results: Intimal hyperplasia, fragmentation and loss of elastic fibers, infiltration of collagen fibers, and disorganization of medial muscle layers were evident in most vein samples. The degree of vein wall degeneration was not different between the 2 groups, and the anatomical sites of GSV. By immunohistochemistry, the expression of MMPs and TIMPs was not significantly different according to the group and the site. The expression of MMP-9 was more intense than that of other MMPs and TIMPs in all samples. MMP-9 was well localized to endothelial cells, medial muscle layers, and adventitial vasa vasorum. Conclusion: There are no distinct differences in the varicose vein samples after short-term postural blood stasis compared to the resting group. MMP-9 may be the key enzyme of the venous wall remodeling.
하지정맥류 환자 및 정상인에서 대복재정맥의 기질 금속단백분해효소 및 금속단백분해효소-조직억제제의 발현도 분석
허승(Seung Huh),최향희(Hyang Hee Choi),김형기(Hyung-kee Kim),김상준(Sang Joon Kim) 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.79 No.6
Purpose: Although varicose veins are very common in adults, the mechanism of the disease has not been established. Degradation of the extracellular matrix is regulated by various matrix metallopreteinases (MMPs) and their inhibitors tissue inhibitor of metallaproteinase (TIMPs). This study was performed to analyse the relationship between venous wall degeneration and expression of these matrix proteinases. Methods: Twelve great saphenous vein (GSV) segments from 7 patients without varicose veins (control) and 86 GSV segments from 18 patients (22 limbs) with varicose veins (C2,4,5EPASPR) were used for this study. Light microscopic examination was used in the evaluation of vein wall degeneration, immunohistochemistry and Western blotting for the expression of MMPs (MMP-1, MMP-2, MMP-9 and MMP-13) and TIMPs (TIMP-1 and TIMP-2), and zymography for gelatinolytic activity of MMP-2 and MMP-9 were performed. Results: MMP-9 was more strongly expressed in the vein wall of both control and patient groups, especially in the endothelial cells and medial muscle layers and TIMP-2 followed. The expression of MMP-9 was closely related to the degree of venous wall degeneration. Activated MMP-2 and MMP-9 were observed in both groups and expressed more in the proximal GSV of the patients. In the Western blotting, the expression of MMP-9 and TIMP-1 were significantly higher than other MMPs and TIMP-2 in the patients with varicose veins. Conclusion: MMP-9 is much more expressed in the wall of degenerative veins. This matrix-degrading enzyme may play an important role in the degeneration of venous wall followed by its remodeling.