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Insect community structures along elevation gradients on ***-san, South Korea

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Journal of Forestry Research 2015年第4期26卷 1013-1018页

作者： Young-Min Shin Il-Kwon Kim Jong-Woo Nam Da-Som Kim Seung Jin Roh Jun Hyoung Jeon Jong Kyun Park Dong-Pyeo Lyu bong-Woo lee bong-Kyu Byun Division of Forest Biodiversity Korea National Arboretum Department of Biological Science and Biotechnology Hannam University Department of Applied Biology Kyungpook National University Department of Forest Sciences Sangji University

Insect communities along three elevation gra- dients on Mt. Seongak-san, South Korea, were investigated from May to September 2013 using traps in order to collect basic data for distributional monitoring of species in a forest ecosystem. A total of 2698 individuals of 309 moth species of 18 families were collected in bucket-light traps, along with 196 individuals of 26 ground-beetle species and 11,276 individuals of 14 ant species in pit-fall traps. The insect community at each site was analyzed using analysisof variance and non-metric multidimensional scaling （NMS）. The ground-beetle and ant abundances varied with elevation. The NMS showed distinct clusters of moths between the ground-beetle and ant distributions with ele- vation and month. The community-level responses of these insect groups to those gradients were analyzed.

关键词： Insect community Elevation ANOVA Bucket-light trap Pit-fall trap South Korea

热处理工艺对A356/SiCp性能及干滑动摩擦磨损特性的影响

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中国有色金属学报 2008年第8期18卷 1458-1465页

作者：金云学 lee Jung-moo KANG Suk-bong 江苏科技大学先进焊接技术省级重点实验室镇江212003 Advanced Materials Division Korea Institute of Machinery and Materials Changwon 641-010 Korea

研究分析热处理工艺对A356/SiCp复合材料的硬度、导电率及微观组织的影响,在此基础上研究复合材料的干滑动摩擦磨损特性。结果表明:固溶和T6热处理可显著提高复合材料的硬度,但降低导电率,而低温退火却比较显著地提高导电率;导电率高的... 详细信息

研究分析热处理工艺对A356/SiCp复合材料的硬度、导电率及微观组织的影响,在此基础上研究复合材料的干滑动摩擦磨损特性。结果表明:固溶和T6热处理可显著提高复合材料的硬度,但降低导电率,而低温退火却比较显著地提高导电率;导电率高的低温退火态磨损特性基本与铸态一致,固溶处理及时效处理虽可有效提高硬度,但不提高耐磨性能,这表明T6热处理是否作为制动盘材料时的最佳热处理工艺,有待进一步研究;复合材料的磨损率随载荷的增加而增加,但低载荷时增加缓慢,高载荷时增加迅速;摩擦因数随着热处理工艺而变化,但对载荷变化不敏感,都在较小的范围内波动,基本是稳定的。

关键词： Al/SiCp 复合材料干摩擦热处理摩擦磨损特性

New magnifying endoscopic classification for superficial esophageal squamous cell carcinoma

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World Journal of Gastroenterology 2017年第24期23卷 4416-4421页

作者： Su Jin Kim Gwang Ha Kim Moon Won lee Hye Kyung Jeon Dong Hoon Baek bong Eun lee Geun Am Song Department of Internal Medicine Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and TechnologyPusan National University Yangsan Hospital Department of Internal Medicine Pusan National University School of Medicine and Biomedical Research InstitutePusan National University Hospital

To assess the accuracy of a new magnifying endoscopy (ME) classification for predicting depth of invasion of superficial esophageal squamous cell carcinoma (SESCC). METHODSThis study included a total of 70 lesions in 69 patients with SESCC who underwent ME with narrow-band imaging (ME-NBI) before resection from August 2010 to July 2016. Accuracy of ME-NBI for predicting depth of invasion of SESCC was analyzed by using a new ME classification proposed by the Japan Esophageal Society (JES), and interobserver agreement was assessed. RESULTSOverall accuracy of ME-NBI for estimating depth of invasion of SESCC was 78.6%. Sensitivity and specificity of type B1 for tumors limited to the epithelial layer (m1) or invading into the lamina propria (m2) were 71.4% and 100%, respectively. Sensitivity and specificity of type B2 for tumors invading into the muscularis mucosa (m3) or superficial submucosa (≤ 200 μm, sm1) were 94.4% and 73.1%, respectively, while those of type B3 for tumors invading into the deep submucosa (> 200 μm, sm2) were 75.0% and 97.8%, respectively. Interobserver agreement was excellent (κ = 0.86, 95%CI: 0.76-0.95). CONCLUSIONThe recently developed JES ME classification is useful for predicting depth of invasion of SESCC, with reliable interobserver agreement.

关键词： Narrow-band imaging Esophageal cancer Squamous cell carcinoma Magnifying endoscopy

Prediction of forming limit curve for pure titanium sheet

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Transactions of Nonferrous Metals Society of China 2018年第2期28卷 319-327页

作者： Young-Suk KIM bong-Hyun lee Seung-Han YANG School of Mechanical Engineering Kyungpook National University Daegu-Gyeongbuk Center Korea Automotive Technology Institute

Commercially pure titanium（CP Ti） has been actively used in the plate heat exchanger due to its light weight, high specific strength, and excellent corrosion resistance. However, researches for the plastic deformation characteristics and press formability of the CP Ti sheet are not much in comparison with automotive steels and aluminum alloys. The mechanical properties and hardening behavior evaluated in stress-strain relation of the CP Ti sheet are clarified in relation with press formability. The flow curve denoting true stress-true strain relation for CP Ti sheet is fitted well by the Kim-Tuan hardening equation rather than Voce and Swift models. The forming limit curve（FLC） of CP Ti sheet as a criterion for press formability was experimentally evaluated by punch stretching test and analytically predicted via Hora＇s modified maximum force criterion. The predicted FLC by adopting Kim-Tuan hardening model and appropriate yield function shows good correlation with the experimental results of punch stretching test.

关键词： Kim-Tuan hardening equation Hora modified maximum force criterion pure titanium sheet forming limit curve

Numerical Study on the Suppression of Shock Induced Separation on the Non-Adiabatic Wall

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Journal of Thermal Science 2000年第4期9卷 305-310页

作者： Doug-bong lee (Dept. of Mechanical Engineering, University of Inchon, 177 Dowhadong Namgu, Inchon, Korea) Dept. of Mechanical Engineering University of Inchon Inchon Korea

A numerical model is constructed to simulate the interaction of supersonic (M = 2.4 ) oblique shock wave / turbulent boundary layer on a strongly heated wall. The heated wall temperature is two times higher than the adiabatic wall temperature and the shock wave is strong enough to induce boundary layer separation. The turbulence model is Spalart-Allmaras model. The comparison of the wall pressure distribution with the experimental data ensures the validity of this numerical model. The effect of strong wall heating enlarges the separation region upstream and downstream. In order to eliminate the separation, wall bleeding is applied at the shock foot position. As a result of the parametric study, the best position of the bleeding slot is selected. The position of the bleeding is very important for the separation suppression. If the bleeding is applied upstream of shock foot, then separation reoccurs after the bleeding slot. If the bleeding is applied downstream of shock foot, the upstream boundary layer is little influenced and still separated. The bleeding vent width is about same as the upstream boundary layer thickness and suction mass flow is 20 to 80 % of the flow rate in the upstream boundary layer. The bleeding mass flow rate is very sensitive to the bleeding vent position if we fix the vent outlet pressure. The final configuration of the shock reflection pattern approaches to the non-viscous value when wall bleeding is applied at the shock impinging point.

关键词： oblique shock wave turbulent boundary layer interaction heated wall separation bleeding

Design of small-area and high-efficiency DC-DC converter for 1 T SRAM

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Journal of Central South University 2012年第2期19卷 417-423页

作者： lee Jae-hyung 金丽妍余忆宁 JANG Ji-hye KIM Kwang-il HA Pan-bong KIM Young-hee Department of Electronic Engineering Changwon National University9 Sarim-Dong

The direct current-direct current （DC-DC） converter is designed for 1 T static random access memory （SRAM） used in display driver integrated circuits （ICs）, which consists of positive word-line voltage （VpwL）, negative word-line voltage （VinyL） and half-VDD voltage （VHDo） generator. To generate a process voltage temperature （PVT）-insensitive VpWL and VNWL, a set of circuits were proposed to generate reference voltages using bandgap reference current generators for respective voltage level detectors. Also, a VOWL regulator and a VNWL charge pump were proposed for a small-area and low-power design. The proposed VpwL regulator can provide a large driving current with a small area since it regulates an input voltage （VCI） from 2.5 to 3.3 V. The VmvL charge pump can be implemented as a high-efficiency circuit with a small area and low power since it can transfer pumped charges to VNWL node entirely. The DC-DC converter for 1 T SRAM were designed with 0.11 μm mixed signal process and operated well with satisfactory measurement results.

关键词： 1 T-static random access memory direct current-direct current converter positive word-line voltage negative word-line voltage half- VDb generator

Roots extracts of Adenophora triphylla *** improve obesity in 3T3-L1 adipocytes and high-fat diet-induced obese mice

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Asian Pacific Journal of Tropical Medicine 2015年第11期8卷 879-886页

作者： Dong-Ryung lee Young-Sil lee bong-Keun Choi Hae Jin lee Sung-Bum Park Tack-Man Kim Han Jin Oh Seung Hwan Yang Joo-Won Suh NutraPham Tech Center for Nutraceutical and Pharmaceutical Materials Myongji University Interdisciplinary Program of Biomodulation Myongji University DONG IL Pharmtec Department of Family Medicine.VIEVIS NAMUH Hospital

Objective:To investigate the anti-obesity activity and the action mechanism of the roots of Adenophora triphylla *** extract(ATE) in high-fat diet(HFD)-induced obese mice and 3T3-LI ***:The roots of Ademption triphylla were extracted with 70%*** demonstrate the compounds,linoleic acid was analyzed by using gas chromatography:and the anti-obesity effects and possible mechanisms of ATE were examined in 3T3-L1 adipocytes and HFD-induced obese ***:Treatment with ATE inhibited the lipid accumulation without cytotoxicity in 3T3-L1 ***,200 and 400 mg/kg ATE treatment significantly decreased the body weight gain,white adipose tissues(WATs) weight and plasma triglyceride level,while 100 and 200 mg/kg ATE treatment increased the plasma high-density lipoprotein cholesterol level in the HFD-induced obese mice,as compared with the HFD *** with 200 and 400 mg/kg ATE also lowered the size of adipocytes in adipose tissue and reduced the lipid accumulation in *** treatment showed significantly lower expression level of adipogenesis-relatcd proteins,such as peroxisome proliferator-activated receptor y,fatty acid binding protein(aP2),fatty acid synthase in 3T3-L1 adipocytes;and furthermore,decreased peroxisome proliferatoractivated receptor γ,aP2,fatty acid synthase,sterol regulatory element binding protein-1c,and lipoprotein lipase mRNA expression levels in WAT of the HFD-induced obese ***:These results suggested that the ATE has an anti-obesity effect,which may be elicited by regulating the expression of adipogenesis and lipogenesis-related genes and proteins in adipocytes and WAT of the HFD-induced obese mice.

关键词： Roots of Adenophora triphylla var. japonica extrac

Hybrid Friction Stir Welding of High-carbon Steel

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Journal of Materials Science & Technology 2011年第2期27卷 127-130页

作者： Don-Hyun Choi Chang-Yong lee Byung-Wook Ahn Jung-Hyun Choi Yun-Mo Yeon Keun Song Seung-Gab Hong Won-Bae lee Ki-bong Kang Seung-Boo Jung School of Advanced Materials Science and Engineering Sungkyunkwan University 300 Cheoncheon-dongJangan-guSuwonGyeonggi-do 440-746South Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology 335 GwahangnoYuseong-guDaejeon 305-701South Korea Department of Advanced Materials Application Suwon Science College 9-10Botong-liJeongnam-myeonHwasungGyeonggi-do 445-742South Korea Technical Research Lab POSCO Corp.Goedong-dongNam-guPohangGyeongbuk790-785South Korea

A high-carbon steel joint,SK5（0.84 wt% C）,was successfully welded by friction stir welding（FSW）,both without and with a gas torch,in order to control the cooling rate during *** welding,the weld zone comprised gray and black regions,corresponding to microstructural variation：a martensite structure and a duplex structure of ferrite and cementite,*** volume fraction of the martensite structure and the Vickers hardness in the welds were decreased with the using of the gas torch,which was related with the lower cooling rate.

关键词： Friction stir welding High-carbon steel Transformation Martensite

Indigenous parasitoids as effective natural enemies of Phyllocnistis citrella(Lepidoptera:Gracillariidae)in Korea

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Journal of Forestry Research 2017年第1期28卷 183-187页

作者： sanghyeob lee Da-Som Kim Il-Kwon Kim Chung-Won Choi Rokyeon Hwang Deok-Seo Ku bong-Kyu Byun Department of Plant Biotechnology and Plant Engineering Research Institute Sejong UniversitySeoul 05006Republic of Korea Department of Biological Science and Biotechnology Hannam University461-6 Jeonmin-dongYuseong-guDaejeon 34054Republic of Korea Division of Forest Biodiversity Korea National ArboretumPocheon 11186Republic of Korea Citrus Research Institute SeogwipoJeju 63607Republic of Korea The Science Museum of Natural Enemies Geochang 50147Republic of Korea

This study is aimed to investigate the occurrence of Phyllocnistis citrella Stainton （citrus leafminer; CLM）, which has recently caused increasing damage to citrus farms in southern South Korea, and its natural enemies, which can act as biological control agents. In the present study, CLM monitoring using sex pheromone traps were conducted in the major citrus farms in the Jeju region in South Korea. Also a survey of parasites was carried out to detect the effective control agent for CLM. During the investigation from 2011 to 2015, a relatively large number of adult CLM （2,386,990） were observed in the sex pheromone traps. The mean annual occurrence of CLM was 477,398, which showed an increasing trend with the increase in temperature. A survey of parasites was conducted in November 2015. Six parasites were found, of which, Quadrastichus sp. and Sympiesis sp. showed the highest rates of parasitism. The mean rate of parasitism during the survey period was 3.97 %. We discovered four new species of parasites of CLM in South Korea.

关键词： CLM Biological control. Parasitoid Korea