전남지역 고구마 재배지에서 담배거세미나방(Spodoptera litura) 발생 소장 및 발생에 영향을 주는 기상 요인

양정욱,안정섭,이형운,정미남,이준설,한선경,안승현 한국국제농업개발학회 2017 韓國國際農業開發學會誌 Vol.29 No.1

Spodoptera litura (Fabricius, 1775) is considered as a serious agricultural pest, which damaged to the many crops including sweet potato (Ipomoea batatas). We investigated weekly occurrence of the Spodoptera litura (Fabricius) using pheromone trap at six study fields of three regions, Jeonnam, Korea. A total of 41,895 individuals were collected from 18th July to 23th September in 2013; Yeongamgun was collected the highest individuals (17,519), and following the Muan-gun (12,709) and Haenamgun (11,667). The seasonal occurrence of S. Litura was increased from July to September, and peak occurrence timing was in late-September. There were a positive correlation between field area and number of individuals (P=0.02, r=0.89), and a negative correlation between field area and density (p=0.02, r=-0.89). As a PCA (principal component analysis) result, adults occurrence pattern were closely related to the temperature and relative humidity during larva stage.

선택적 전류공급구조를 갖는 병렬형 A/D 변환기

양정욱,김욱,김원찬,Yang, Jung-Wook,Kim, Ook,Kim, Won-Chan 한국통신학회 1993 韓國通信學會論文誌 Vol.18 No.12

본 논문에서는 full-flash A/D 변환기에서 전력소모를 줄이는 방법과 그의 회로를 제안하였다. Full-flash A/D 변환기에서 해상도가 증가하면 전압비교기의 수는 지수함수적으로 증가하며 모든 전압비교기가 항상 동작하여 전력 소모가 많으므로 제안하는 구조에서는 입력 신호의 크기에 까라 그 영역에 해당하는 위치에 있는 전압비교기를 선택적으로 켜줌으로써 전력 소모를 줄인다. 입력 신호의 크기를 판별하기 위하여 입력 신호의 범위를 찾는 회로를 설계하였다. 클리치 잡음을 줄일 수 있는 클럭 발생회로를 설계하여 사용함으로써 전압 비교기의 전류원에서 발생하는 잡음을 일반적인 클럭을 사용했을 때와 비교하여 1/4로 줄였다. 설계한 A/D 변환기는 out-off 주파수가 5GHz 인 1.2 m의 BiCMOS 공정으로 제작하였다. 이는 350Msamples /s의 변환 속도를 가지며 소모 전력은 900mW이다. A power-reduction technique for full-flash A/D converters is proposed. As the resolution of a full-flash A/D converter increases linearly, the number of comparators increases exponentially. The power dissipation is generally larger than other A/D converter architectures because there are many comparators, and they are operating continuously. In this proposed architecture, only a selected number of conmarators are made to operate instead of activating all the comparators of the full-flash A/D convertor. To determine whichcomparators should be activated, voltage levelfider circuits are used. A new clock driver is developed to suppress the dynamic glitch noise which is fed back into the input stage of the comparator. By using this clock driver, the glitch noise in the current source is reduced to one fourth of that when the typical clock signal is applied. The proposed architecture has been implemented with 1.2 m 5GHz BiCMOS technology. The maximum conversion speed is 350Msamples/s. and dissipates only 900mW.

Wall shear stress in hypertensive patients is associated with carotid vascular deformation assessed by speckle tracking strain imaging

양정욱,조경임,김제훈,김수영,김철수,유가인,이진영,최선윤,이시원,김현수,허정호,차태준,이재우 대한고혈압학회 2014 Clinical Hypertension Vol.20 No.-

Introduction: Wall shear stress (WSS) is critically important in both vascular remodeling and atherosclerosis. Carotid intima-media thickness (IMT) and deformation parameters have been used as relevant indicators of carotid atherosclerosis. This study aimed to investigate the relationships between hemodynamic parameters in the common carotid artery (CCA) and the severity of carotid atherosclerosis in untreated hypertensive patients. Methods: Carotid artery ultrasound was performed in 100 untreated hypertensive patients. Morphologic and hemodynamic parameters of the CCA, including peak and mean WSS, global circumferential strain, peak posterior radial strain assessed by two-dimensional speckle tracking method, and IMT, were measured. Results: In patients with hypertension, there were significant correlations between carotid strain parameters and peak/mean WSS. Stepwise multiple regression analysis for carotid strain parameters after adjustment for age, carotid IMT, and brachial pulse wave velocity showed that peak WSS was an independent determinant of peak posterior radial strain (p = 0.009) and global circumferential strain (p = 0.002). Conclusions: These findings indicate that local shear stress is associated with carotid vascular deformation, which could be an underlying mechanism for the progression of atherosclerosis.

Osteoclast-like Giant Cell Tumor of Parotid Gland with a Carcinomatous Component: A Case Report

양정욱,김현철,이정희,이종실,김동출,송대현,김진평,고경혁 대한병리학회 2012 Journal of Pathology and Translational Medicine Vol.46 No.3

The giant cell tumor of the salivary gland is very rare, and 20 cases have been reported in the English-language literature. We report an additional case. A 57-year old man had noticed a mass in the right parotid area for several weeks. The diagnosis using aspiration cytology was a giant cell tumor possibly with a carcinomatous component. Superficial parotidectomy was carried out. The resected parotid gland contained a 1.8 cm-sized well-circumscribed brownish tumor. Histologically the tumor consisted of evenly distributed osteoclast-like giant cells, mononuclear cells and two small foci of a carcinomatous component. The osteoclast-like giant cells and mononuclear cells were positive for vimentin and CD68, and the carcinomatous component was positive for cytokeratin and epithelial membrane antigen. There was no metastatic lesion in the cervical lymph nodes. We believe this is the first case in Korea of an osteoclast-like giant cell tumor of the parotid gland.

Dedifferentiated Solitary Fibrous Tumor of Thoracic Cavity

양정욱,고경혁,송대현,장인석 대한병리학회 2014 Journal of Pathology and Translational Medicine Vol.48 No.3

웹 정보 통합 및 검색을 위한 XML 기반 미디에이터 시스템의 개발

양정욱,홍동완,이덕형,윤지희 한국데이타베이스학회 2001 국제학술대회 Vol.4 No.1

HMS(Hallym Mediator System)는 XML을 기본 데이터 모델로 하여 인터넷에 산재하여 있는 분산이질 정보에 대한 통합, 검색기능을 제공하는 미디에이터 시스템이다. 분산이질 정보의 공통 스키마 구조로서 XML DTD를 사용하며, 각종 정보에 대한 가상의 통합 뷰(view) 생성기능을 제공하여 웹 상의 통합된 가상정보 구조를 표현한다. 웹 상의 일반 사용자는 이와 같이 생성된 뷰 DTD를 근거로 분산이질 정보에 대한 구조적, 내용적 질의를 수행할 수 있다. HMS는 가상접근 기법(virtual approach) 기반의 정보검색 시스템으로서, 사용자 질의는 XML 형태의 소스 매핑정보를 이용하여 각 소스에 대한 부질의로 변환되며, 각 소스로부터의 검색결과는 시스템에 의하여 통합되어 XML 문서 형태로 돌아오게 된다. HMS에서는 DTD 구동형의 비쥬얼 사용자 인터페이스를 제공하여, 관리자와 일반 사용자에게 직관적이고 간편한 가상정보 구축 및 질의검색 환경을 제공한다.

Priming of Defense-Related Genes Confers Root-Colonizing Bacilli-Elicited Induced Systemic Resistance in Pepper

양정욱,유승헌,류충민 한국식물병리학회 2009 Plant Pathology Journal Vol.25 No.4

A group of beneficial plant bacteria has been shown to increase crop growth referring to as plant growthpromoting rhizobacteria (PGPR). PGPR can decrease plant disease directly, through the production of antagonistic compounds, and indirectly, through the elicitation of a plant defense response termed induced systemic resistance (ISR). While the mechanism of PGPR-elicited ISR has been studied extensively in the model plant Arabidopsis, it is less well characterized in crop plants such as pepper. In an effort to better understand the mechanism of ISR in crop plants, we investigated the induction of ISR by Bacillus cereus strain BS107 against Xanthomonas axonopodis pv. vesicatoria in pepper leaves. We focused on the priming effect of B. cereus strain BS107 on plant defense genes as an ISR mechanism. Of ten known pepper defense genes that were previously reported to be involved in pathogen defense signaling, the expression of Capsicum annum pathogenesis-protein 4 and CaPR1 was systemically primed by the application of strain BS107 onto pepper roots confirming by quantitative- reverse transcriptase PCR. Our results provide novel genetic evidence of the priming effect of a rhizobacterium on the expression of pepper defense genes involved in ISR.

고분자 연료전지 수소 재순환용 이젝터 최적설계 및 스택 연계 운전 성능 특성 연구

양정욱,이남진,양성모,김범준 한국기계기술학회 2018 한국기계기술학회 학술대회논문집 Vol.2018 No.05

시클로스포린 또는 하루 1회 타크로리무스를 복용 중인 신이식 환자에서 하루 1회 타크로리무스로 전환 후 인슐린 감수성 및 지질 변화

양정욱,김예나,신호식,정연순,임학 대한이식학회 2017 Korean Journal of Transplantation Vol.31 No.3

Background: Tacrolimus (Tac) can cause impaired insulin release and dyslipidemia, and may affect the development of post-transplant diabetes mellitus. However, these effects on insulin sensitivity and lipid profile have not been compared in renal transplant recipients receiving traditional twice-daily tacrolimus (TacBID) or cyclosporine and those receiving once-daily prolonged release formulation of tacrolimus (TacOD). Methods: We conducted an observational prospective study of 15 stable non-diabetic renal transplant recipients to observe the changes in insulin sensitivity and lipid profiles for 1 year at a tertiary hospital. We evaluated the levels of hemoglobin A1c, total cholesterol, high density lipoprotein, low density lipoprotein, triglycerides, apolipoprotein A1, apolipoprotein B, serum creatinine, fasting plasma glucose, fasting insulin, homeostatic model assessment of -cell (HOMA-) and HOMA-insulin resistance index at baseline and at 2 and 4 months. To analyze differences in parameters, we conducted a Wilcoxon rank sum test and general linear model (GLM)-repeated measures analysis of variance (ANOVA) in both groups (cyclosporine to TacOD conversion group/TacBID to TacOD conversion group). Results: At baseline, parameters did not differ between groups. GLM-repeated measures ANOVA revealed no change in insulin sensitivity or lipid profile after conversion at baseline or at 2 and 4 months. There were no complications after conversion from standard TacBID or cyclosporine to TacOD. Conclusions: There was no change in insulin sensitivity or lipid profile in renal transplant recipients. Any conversion from TacBID to TacOD should be performed in a controlled manner under close surveillance.

A Rare Case of Thymic Gangliocytic Paraganglioma

양정욱,한정호,이현우,조수연,김홍관 대한병리학회 2016 Journal of Pathology and Translational Medicine Vol.50 No.2