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.

都市 下水슬러지의 堆肥化에 關한 硏究

宋濟天,柳明辰,金東玟 동아대학교 환경문제연구소 1986 硏究報告 Vol.9 No.3

Composting may be defined as a biochemical process in which microorganisms break down and convert solid organic matters into stable, humus like end products. The composting of municipal wastewater sludge has become an accepted technology as a means of sludge stabilization and resource recovery in recent years. Investigated in this study were the compostability of municipal sludge without the use of bulking agents, e.g., wood chips, tree barks, sow-dusts and rice-hulls ; relevant, influencing factors such as moisture contents, pH values, aeration rates, and volatile solid contents ; and process reaction rates. The sample sludges, obtained from Seoul Cheongye Sewage Treatment plant, were those digested and dewatered by mechanical means with the aid of lime and ferric chloride. The pH values, moisture contents, voltile solid contents and C/N ratios of the sample sludge ranged 10 to 12, 60 to 70%, 55 to 55% and 8 to 12, respectively. In this study, three, 35-liter reactors were used; the reactors were operated on batch basis for the duration of 8 to 12days. In order to maintain aerobic conditions and expect air drying effects, air was supplied to each reactor in the rates of 50-300 ℓ/㎥, main in the first half of experiments and fixed to 120ℓ/㎥. min in the second half. The mixture was mixed completely once a day by mechanical agitator. The results of this study follow; 1. The municipal sludge can be composted without the use of bulking agents. 2. The composting of the sole sludge without any additives can be carried out in reduced reaction periods 1 to 2 weeks. 3. The compost sludge can be used as both, the soil conditioner and low-nutrient fertilizer. It contained 35 to 40% moisture, 35 to 45% valatile solids, 1.9 to 2.2% nitrogen, 2.1 to 2.5% phosphorus and 0.18 to 0.22% potassium, and was 7.5 to 8.0 in pH values and 8 to 10 in C/N ratios. 4. The optimum pH values, aeration rates, and moisture contents were 7.5 to 8, approximately 120ℓ/㎥.min and 55 to 60%, respectively.

부산시 일개구 지역주민의 위암선별검사 수검 및 반복수검 실태 및 관련요인조사

정인숙,배은숙,천동환,전진호,이화자,박남희 韓國保健敎育.健康增進學會 2003 보건교육건강증진학회지 Vol.20 No.1

The importance of repeat screening for stomach cancer is well known to decrease deaths from stomach cancer. This study was aimed at assessing practice behaviors and to identify related factors in the aspects of demographic factors, health status and cancer risk recognition, attitude to cancer screening, health behaviors, and inhibiting or facilitating factors to stomach cancer screening in an urban area. Data was collected through self-administered questionnaires from 403 people aged 40 to 69 years from April 23th to May 15th, 2002. Practice behaviors were classified as :"ver"r "ver"and "peat"r "t repeat"rouped based on a recent 5 year screening history. The results were as follows: 1. Among the 403 subjects: "e ever group"as 23.8% and "e repeat group"as 4.0%. The rates of screening were 20.5% for men, 27.8% for those women, and 27.3% for aged 40-49, 24.5% for those aged 50-59, 19.0% for those aged 60-69. The rates of repeat screening were 4.0% for men, 4.1% for women, and 2.9% for those aged 40-49, 6.3% for aged 50-59, 2.5% for those aged 60-69. 2. The main factors associated with adherence to gastric cancer screening were education(post high school vs below : OR=2.44), previous cancer screening(yes vs no : OR=2.61), belief in personal health(no vs yes : OR=2.72), health status(unhealthy vs healthy : OR=3.40), possibility of cancer compared to others(low vs not low : OR=2.56), and regular exercise(yes vs no : OR=2.94). The main factor associated with adherence to gastric cancer repeat screening was other cancer screening (yes vs no : OR=6.33). Consequently, there is a need to change the recognition of the importance and necessity of stomach cancer screening in healthy conditions through health education, and to perform multiple screening tests each visit.

디지탈 교환기 시스템용 결함 허용 시스템에 관한 연구

김현욱,이동욱,한창호,문태수,이광배,박석천 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-

A Fault tolerant system is one that can continue to correctly perform its specified tasks in the presence of hardware failures and software errors. This paper discribes hardware redundancy of fault tolerant methods used in the present digital switching systems, and proposes several new fault tolerant methods for digital switching systems. In addition, are compared and analyzed reliabilities between thr present and the new facult tolerant methods.

Reconsidering the Hierarchy and Translation of “Physical Education/Sports” Related Terms: Taiwan Perspective

Jeffrey Yu,Jun Lian,Ruei-Hong Li,Chen-Sin Hung,Dong-Tai Chen,Yu-Kai Chang 대한운동학회 2024 아시아 운동학 학술지 Vol.26 No.1

Objectives In the past centuries, the concept of “physical education” has changed from a more general concepts including physical activities and sports, to specifically inferring “instruction of physical activity”. Instead, “sports” has become the comprehensive concept of sports, exercise, and physical education. Given to the inconsistent terminologies and English translations of “體育 (ti-yu)” (physical education) and “運 動 (yun-dong)” (sports or exercise) in Mandarin, the purpose of this study was to investigate in the current terminology usage, hierarchy, and the English translation of “體育 (ti-yu)” and “運動 (yun-dong)” in Taiwan. Met hods Three government authorities, two sport related universities, eight top sport and exercise journals, and nighty-six college departments in Taiwan were analyzed. Results “運動 (yun-dong)” was the most widely used terminology as “體育 (ti-yu)” occupied the majority usage among government authorities, sport related universities, and title of top sport and exercise journals. Regarding English translation, despite of “department of physical education”, “sports” remained the most common terminology. Moreover, “體育 (ti-yu)” and “sports” are the highest hierarchy among government authorities, and sport related university; “體育 (ti-yu)” and “physical education” are the highest hierarchy among traditional sport and exercise journals; “運動 (yun-dong)” and “sports” are the highest hierarchy among college departments also the mainstream of current translation and hierarchy. Conclusions “體育 (ti-yu)” was the highest hierarchy in the past. However, “運動 (yun-dong)” has been the mainstream of the highest hierarchy in Mandarin according to college departments. In English, “sport(s)” is the main term in Taiwan when translating “體育 (ti-yu)” and 運動 (yun-dong)”, also being the highest hierarchy. On the other hand, “體育 (ti-yu)” and “physical education” are utilized regarding those departments focusing on educating PE teachers. This study expects the terminology, English translations, and hierarchy being align with the mainstream of current translation and hierarchy in the future.

Radiative decay of theψ(2S)into two pseudoscalar mesons

Bai, J. Z.,Ban, Y.,Bian, J. G.,Blum, I.,Chen, A. D.,Chen, G. P.,Chen, H. F.,Chen, H. S.,Chen, J.,Chen, J. C.,Chen, X. D.,Chen, Y.,Chen, Y. B.,Cheng, B. S.,Choi, J. B.,Cui, X. Z.,Ding, H. L.,Dong, L. Y American Physical Society 2003 Physical review. D, Particles and fields Vol.67 No.3

SOME RESULTS ON 2-STRONGLY GORENSTEIN PROJECTIVE MODULES AND RELATED RINGS

Dong Chen,Kui Hu 대한수학회 2023 대한수학회보 Vol.60 No.4

In this paper, we give some results on 2-strongly Gorenstein projective modules and related rings. We first investigate the relationship between strongly Gorenstein projective modules and periodic modules and then give the structure of modules over strongly Gorenstein semisimple rings. Furthermore, we prove that a ring $R$ is 2-strongly Gorenstein hereditary if and only if every ideal of $R$ is Gorenstein projective and the class of 2-strongly Gorenstein projective modules is closed under extensions. Finally, we study the relationship between 2-Gorenstein projective hereditary and 2-Gorenstein projective semisimple rings, and we also give an example to show the quotient ring of a 2-Gorenstein projective hereditary ring is not necessarily 2-Gorenstein projective semisimple.

Asian Organization for Crohn’s and Colitis and Asia Pacific Association of Gastroenterology consensus on tuberculosis infection in patients with inflammatory bowel disease receiving anti-tumor necrosis factor treatment. Part 1: risk assessment

( Dong Il Park ),( Tadakazu Hisamatsu ),( Minhu Chen ),( Siew Chien Ng ),( Choon Jin Ooi ),( Shu Chen Wei ),( Rupa Banerjee ),( Ida Normiha Hilmi ),( Yoon Tae Jeen ),( Dong Soo Han ),( Hyo Jong Kim ) 대한장연구학회 2018 Intestinal Research Vol.16 No.1

Because anti-tumor necrosis factor (anti-TNF) therapy has become increasingly popular in many Asian countries, the risk of developing active tuberculosis (TB) among anti-TNF users may raise serious health problems in this region. Thus, the Asian Organization for Crohn’s and Colitis and the Asia Pacific Association of Gastroenterology have developed a set of consensus statements about risk assessment, detection and prevention of latent TB infection, and management of active TB infection in patients with inflammatory bowel disease (IBD) receiving anti-TNF treatment. Twenty-three consensus statements were initially drafted and then discussed by the committee members. The quality of evidence and the strength of recommendations were assessed by using the Grading of Recommendations Assessment, Development, and Evaluation methodology. Web- based consensus voting was performed by 211 IBD specialists from 9 Asian countries concerning each statement. A consensus statement was accepted if at least 75% of the participants agreed. Part 1 of the statements comprised 2 parts: risk of TB infection Recommenda-during anti-TNF therapy, and screening for TB infection prior to commencing anti-TNF therapy. These consensus statements will help clinicians optimize patient outcomes by reducing the morbidity and mortality related to TB infections in patients with IBD receiving anti-TNF treatment. (Intest Res 2018;16:4-16)

Patterns and drivers of Vibrio isolates phylogenetic diversity in the Beibu Gulf, China

Chen Xing,Du Hong,Chen Si,Li Xiaoli,Zhao Huaxian,Xu Qiangsheng,Tang Jinli,Jiang Gonglingxia,Zou Shuqi,Dong Ke,Adams Jonathan M.,Li Nan,Jiang Chengjian 한국미생물학회 2020 The journal of microbiology Vol.58 No.12

Members of the genus Vibrio are ubiquitous in aquatic environments and can be found either in a culturable or a viable but nonculturable (VBNC) state. Despite widespread concerns as to how to define the occurrence and dynamics of Vibrio populations by culture-independent approaches, further physiological research and relevant biotechnological developments will require the isolation and cultivation of the microbes from various environments. The present work provides data and perspectives on our understanding of culturable Vibrio community structure and diversity in the Beibu Gulf. Finally, we isolated 1,037 strains of Vibrio from 45 samples and identified 18 different species. Vibrio alginolyticus, V. cyclitrophicus, V. tasmaniensis, V. brasiliensis, and V. splendidus were the dominant species that had regional distribution characteristics. The correlation between the quantitative distribution and community structure of culturable Vibrio and environmental factors varied with the Vibrio species and geographical locations. Among them, salinity, nitrogen, and phosphorus were the main factors affecting the diversity of culturable Vibrio. These results help to fill a knowledge gap on Vibrio diversity and provide data for predicting and controlling pathogenic Vibrio outbreaks in the Beibu Gulf.

Nephrin phosphorylation regulates podocyte adhesion through the PINCH-1-ILK-α-parvin complex

Dong Qing Zha,Cheng Chen,Cheng Chen,Xing Hua Chen,Tean Ma,Hong Xia Yang,Harry Van Goor,Guo Hua Ding 생화학분자생물학회(구 한국생화학분자생물학회) 2013 BMB Reports Vol.46 No.4