A Particle Swarm Optimization-Based Multi-level Processing Parameters Optimization Method for Controlling Microstructures of an Aged Superalloy During Isothermal Forging

Dong‑Dong Chen,Y. C. Lin 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5

To obtain the designed target microstructures of an aged superalloy during isothermal forging, a multi-level processingparameters optimization method is developed based on particle swarm optimization (PSO) algorithm. In the developedmethod, the accurate material models are used to characterize the microstructural evolution. Based on the designed targetmicrostructures, the global and local optimality criterions are constructed to alternately optimize global and local multi-levelprocessing parameters by the PSO algorithm with a linear decreasing inertia weight strategy. The optimized initial volumefraction of δ phase (δVF), deformation temperature and strain rate are 12.95%, 1000 °C and 0.001 s−1, respectively. Accordingto these optimized parameters, the recrystallization volume fraction, average grain size and δVF are 100%, 11.2 μm and2.1%, respectively, which well agree with the designed targets. Additionally, the processing parameters optimized by thedeveloped method and traditional processing maps are compared. It is found that the developed method is more effective tocontrol microstructures for the studied superalloy.

경피흡수제제의 약동학적 분석 : Ketoprofen 첩포제의 예

장인진,임동석,이우영,신상구 大韓臨床藥理學會 1994 臨床藥理學會誌 Vol.2 No.2

美國急進主義運動의 擡頭와 衰退要因硏究

鄭然植,金慶麟,陳壽美,金東根 慶北大學校 1986 論文集 Vol.42 No.-

The purpose of this study is to explore the unfolding of the radical movement in the United States during the turn of this century. It particularly concerns about the factors determining the uprising of the radicalism at the end of the 19th century and its fall with the World War Ⅰ. The rise of American radical movement can be traced back to the industrializing era after the Civil War. It started as a reaction to the evils resulted from the rapid industrialization. Initially several movements broke out sporadically, however, until the radical ideology from Europe was flowed in. Then, the radical movement was accelerated. During this period, the leading figures who particularly influenced the development of the movement were: De Leon from the Socialist Labor Party; Gompers from the American Federation of Labor; Debs from the Socialist Party; and Haywood from the Industrial Workers of the World, etc. The movement in this era was unfolded the following historical phases: from 1870s to 1880s, the preparation stage of organizing the movement; 1890s, early action stage characterized by the Populist Movement, Pullman Strike, etc.; 1900s, the flourishing phase led by the Socialist Party and IWW; the declining phase was followed since the end of 1910s; after 1920s, American pragmatism again prevailed over radicalism. Factors attributed to the rise of the radical movement are: depravation of entrepreneurship; recurrent economic crises; deterioration of labor conditions; the influence of Marxism; and insensitive attitudes on the part of the capitalists and government. This paper also suggests the factors determining the decline of the movement: the rise of the American patriotism around the World War Ⅰ era; government's strong counteractions; anti-socialism prevailed by the negative impact of the Soviet Revolution; collapse of the movement organizations; economic recovery after the War; and the government's implementations of reforming policies. At conclusion, radicalism in the United States has played the preventive role against the risk of irreversible corruption of the Establishment and its rigidity.

Structural Analyses of total Anionic Cyclosophoraoses Synthesized by Rhizobium meliloti 2011

Dong-huyk Seo, Sanghoo Lee, Hey-lin Park, Dong-Heui Yi, EunJung Ji, Dae-Ho Shin, Seunho Jung 대한화학회 2002 Bulletin of the Korean Chemical Society Vol.23 No.6

Harm Avoidance is Correlated with the Reward System in Adult Patients with Attention Deficit Hyperactivity Disorder: A Functional Magnetic Resonance Imaging Study

Tsung-Hua Lu(Tsung-Hua Lu),Shih-Hsien Lin(Shih-Hsien Lin),Mei Hung Chi(Mei Hung Chi),Ching-Lin Chu(Ching-Lin Chu),Dong-Yu Yang(Dong-Yu Yang),Wei Hung Chang(Wei Hung Chang),Po See Chen(Po See Chen),Yen 대한정신약물학회 2023 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.21 No.1

Objective: Hypoactivity in the reward system among patients with attention deficit hyperactivity disorder (ADHD) is a well-known phenomenon. Whether the activity in the reward pathway is related to harm avoidance, such as in sensitivity to punishment, is unclear. Evidence regarding the potential difference between ADHD patients and controls in terms of this association is scarce. Methods: Event-related functional magnetic resonance imaging was conducted on subjects performing the Iowa gambling test. Fourteen adults with ADHD and 14 controls were enrolled in the study. Results: Harm avoidance was found to be positively correlated with the activities of the bilateral orbitofrontal cortex and right insula in individuals with ADHD. A group difference was also confirmed. Conclusion: Understanding the roles of harm avoidance and brain activation during risk tasks is important.

中国大气污染问题和改善方向 : 以甘肃省兰州市为中心

Lin Dong,Jae Eun Lee 위기관리 이론과 실천 2019 Disastronomy Vol.2 No.1

The problem of air pollution in China comes along with the process of industrialization and urbanization, which is mainly caused by human activities. Recently, although China has achieved certain results in the process of air pollution prevention and control, it is mainly an one-way management mode dominated by the government in the process of prevention and control, which tends to cause problems such as low efficiency and unreasonable treatment methods. Therefore, the main purpose of this study is how to effectively prevent and control air pollution. On the one hand, this paper attempts to quote the analysis results of various literatures on China's air pollution control policies. On the other hand, this paper introduces the causes of air pollution and the changes of air pollution control policies in China. This article analyzes the problems that should be reflected in the process of air pollution control in Lanzhou, which was one of the ten most polluted cities in China. Finally, it points out the improvement directions for the prevention and control of air pollution in the future; (1) It is the time for local governments at all levels to strengthen cooperative exchanges and ensure the efficient allocation of various equipments, technologies and other resources. It is a necessary condition for successful control of air pollution. (2) Although the primary source of air pollution is the industrial activities of enterprises, the development of enterprises is also one of the important means to promote regional economic development. So, in the process of air pollution prevention and control, the benefits and costs of enterprises should also be taken into account, and the development obstacles faced by each enterprise should be considered. (3) It is necessary for the government to pay attention to the openness and authenticity of environmental information. It is no doubt that a good and transparent social environment helps to promote the convergence of other forces. (4) The basic right of the public to participate in environmental protection should be guaranteed as far as possible.

Features Extraction and Mechanism Analysis of Partial Discharge Development under Protrusion Defect

Dong, Yu-Lin,Tang, Ju,Zeng, Fu-Ping,Liu, Min The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.1

In order to study the development of partial discharge (PD) under typical protrusion defects in gas-insulated switchgear, we applied step voltages on the defect and obtained the ${\varphi}-u$ and ${\varphi}-n$ spectrograms of ultra-high frequency (UHF) PD signals in various PD stages. Furthermore, we extracted seven kinds of features to characterize the degree of deterioration of insulation and analyzed their values, variation trends, and change rates. These characteristics were inconsistent with the development of PD. Hence, the differences of these features could describe the severity of PD. In addition, these characteristics could provide integrated characteristics regarding PD development and improve the reliability of PD severity assessment because these characteristics were extracted from different angles. To explain the variation laws of these seven kinds of parameters, we analyzed the relevant physical mechanism by considering the microphysical process of PD formation and development as well as the distortion effect generated by the space charges on the initial field. The relevant physical mechanism effectively allocated PD severity among these features for assessment, and the effectiveness and reliability of using these features to assess PD severity were proved by testing a large number of PD samples.

An Enhanced Remote Data Checking Scheme for Dynamic Updates

( Lin Dong ),( Jinwoo Park ),( Junbeom Hur ),( Ho-hyun Park ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.5

A client stores data in the cloud and uses remote data checking (RDC) schemes to check the integrity of the data. The client can detect the corruption of the data using RDC schemes. Recently, robust RDC schemes have integrated forward error-correcting codes (FECs) to ensure the integrity of data while enabling dynamic update operations. Thus, minor data corruption can be recovered by FECs, whereas major data corruption can be detected by spot-checking techniques. However, this requires high communication overhead for dynamic update, because a small update may require the client to download an entire file. The Variable Length Constraint Group (VLCG) scheme overcomes this disadvantage by downloading the RS-encoded parity data for update instead of the entire file. Despite this, it needs to download all the parity data for any minor update. In this paper, we propose an improved RDC scheme in which the communication overhead can be reduced by downloading only a part of the parity data for update while simultaneously ensuring the integrity of the data. Efficiency and security analysis show that the proposed scheme enhances efficiency without any security degradation.

요대(遼代) 도성(都城)의 유형과 형태구조에 대한 고찰

Dong Xin Lin 국립문화재연구원 2012 헤리티지:역사와 과학 Vol.45 No.3

요대( 代)에는 오경(五京)이 설치되었다. 요( )의 상경(上京)이 수도이고 중경(中京)은 배도(陪都)이며, 다른 세 곳은 상징적 의미의 경성(京城)이다. 상경은‘일(日)’자형 구조로 중국 고대 도성제도의 새로운 모델이다. 중경은 여러 겹으로 둘러싸인 배 치형태로 변량성( 梁城) 등의 영향을 받은 것이다. 남경과 서경, 동경의 3경은 당(唐) 혹은 발해(渤海) 구성(舊城)의 기초 위에 개축한 것으로 원래의 도시 구조를 이용하였다. 요 상경의 구조와 계획은 금( ), 원(元), 청(淸)의 도성 구조에 상당히 중요한 영향을 주었다. 요( ), 송(宋), 금( ), 원(元), 명(明) 등의 왕조에서는 다수의 경(京)이나 도(都)를 설치하였으며 대부분은 배도(陪都)의 성격 을 지니고 있다. 요대(916~1125년)에는 오경이 설치되었는데, 상경(上京) 임황부(??潢府, 현 내몽고 파림좌기[巴林左旗] 임동 진[??東鎭] 남쪽)는 요나라의 수도이고, 그 외에 동경(東京) 요양부( 陽府, 현 요녕성 요양[ 陽]시 인근), 남경(南京) 석진부(析 津府, 현 북경 광안문[廣安門] 밖 선무구[宣武區] 일대), 중경(中京) 대정부(大定府, 현 내몽고 영성[ 城]현 철장영자[鐵匠營子]), 서경(西京) 대동부(大同府, 현 대동시) 등이 있다. 본고에서는 계획이념과 형태구조 그리고 주요 배치 형태 등을 중심으로 요대 오경의 유형과 형태구조에 대한 기초적인 고찰을 하고자 한다. The five capital(五京) was installed in the Liao(遼) Dynasty. Shangj?ng(上京) was the main capital city of the Liao(遼) Dynasty. Zh?ngj?ng(中京) was the second capital(陪都); and the other three was the capital city with symbolic meaning. The layout of Shangj?ng was the '日-shaped plan; this was newly advent structure of ancient Chinese capital city system. Zh?ngj?ng(中京) was surrounded by multiple ramparts influenced by the Bianliang Fortress (?梁城). Three capitals, Nanjing(南京), X?j?ng(西京) and D?ngj?ng(東京), were reconstructed on the foundation of the previously constructed town in Tang(唐) or Bohai(渤海) Fortress (舊城). The structure and Planning of shangj?ng(上京) in the Liao(遼) Dynasty, had significantly influenced in the capital city planning of the J?n(金), Yuan(元) and Qing(淸) Dynasties of China

Effect of Male-Sterile Cytoplasm on the Genetic Performance of Agronomic Traits in $F_1$ Hybrid Rices

Lin, Wen-Xiong,Kim, Kil-Ung,Shin, Dong-Hyun,Lee, In-Jung,He, Shui-Lin,Moon, Huhn-Pal The Korean Society of Crop Science 1998 Korean journal of crop science Vol.43 No.2

Three different male-sterile cytoplasmic lines and their common maintainer 'Zhenshan 97B' and two elite restorer lines were used to study cytoplasmic effects on agronomic trait manifestation per se under different nitrogen supply levels. The result showed that cytoplasmic effects could be modified by nitrogen environments. The cytoplasmic effect on grain yield under 150 kg N/ha varied depending on crosses, while it was significantly negative in most crosses under both 60 and 330 kg N/ha. The correlation and path-coefficient analyses suggested that it was expected to improve cytoplasmic effects through reducing maximum tillers and increasing the percentage of productive tillers, leading to increased productive tillers and higher yield in hybrid rice by the aid of cultural practice and genetic transformation. This study also revealed that the same cytoplasm in different combinations had differential effect under the same nitrogen environment, indicating that cytoplasmic effect was produced by interaction of nuclear genes with cytoplasm rather than cytoplasm per se. These results indicated the usefulness of evaluating diverse cytoplasmic sources in various nuclear genotypes bred for hybrid rice breeding program. The finding also suggested that negative cytoplasmic effect could be effectively overcome by elite restorer lines through the interaction of nuclear genes with female cytoplasm.