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Monitoring of Cylindrical Grinding Processes by Use of a Non-contact AE System
Pawel Sutowski,Krzysztof Nadolny,Wojciech Kaplonek 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
This paper presents a possible diagnostic method to be applied in the grinding process using the acoustic emission signal (AE) and image analysis. The applied method of the experimental results in computer analysis using the system of tracking changes occurring within the image, as well as the experimental results obtained for single-pass internal cylindrical grinding in steel 100Cr6 described in the work. The experimental results acquired roved that the proposed method enables the detection of signs of wear on the grinding wheel active surface components, during the machining process, as well as allowing for the assessment of their influence on grinding power and workpiece surface roughness parameters. The described method of analysing the AE signal features using such a visual method complement the usual procedures used in these type of the monitoring systems. The proposed solution is far easier to implement in production conditions as it takes place on the program level of such systems and does not interfere with the equipment architecture.
Pawel Pasko,Karolina Bukowska-Strakova,Joanna Gdula-Argasinska,Malgorzata Tyszka-Czochara 한국식품영양과학회 2013 Journal of medicinal food Vol.16 No.8
Although rutabaga (Brassica napus L. var. napobrassica) is a popular crop, especially in North Europe and North America, its sprouts are a new kind of vegetable. Rutabaga roots, and particularly sprouts, have not been investigated so far for antioxidant and anticancer effect on human tumor cells (Hep G2). Therefore, in vitro tests were conducted to find out whether rutabaga seeds, roots, and sprouts exert a cytotoxic effect on mammalian cells and combine them with other biological properties of particular parts of the plant. Rutabaga methanol extracts were measured for total phenolic, total flavonoid concentrations, and total antioxidant activity. Cytotoxicity of the investigated extracts was measured using 3-(4,5-dimethylthiazol-2-yl)2,5-diphenyltetrazolium bromide assay in Chinese hamster ovary cells (CHO-K1) and Hep G2 cells culture. Cell membrane integrity was assessed in CHO-K1 and Hep G2 cells by luminescence ToxiLight BioAssay. The results of the investigation have shown that sprouts have significantly higher antioxidant activity than seeds and roots, which may result from different contents of polyphenols. Rutabaga extracts (especially 8 day sprouts) inhibited the tumor cell line Hep G2 proliferation and had a slight effect on the normal mammalian CHO-K1 culture. An advanced analysis of previously observed morphological changes and cytotoxic properties demonstrated that the evaluated extracts exerted cell death via apoptosis. These findings strongly suggest that one of the biological activities of rutabaga is antiproliferative and proapoptotic potential specific to tumor cells. The obtained results demonstrate the antioxidant property of rutabaga and its potential as a nutritional supplement in cancer prevention. These findings also strongly advocate the application of rutabaga sprouts (especially harvested in conditions presented in this article) in functional food.
Pawel Chrom,Rafal Stec,Lubomir Bodnar,Cezary Szczylik 대한암학회 2018 Cancer Research and Treatment Vol.50 No.1
Purpose The study investigated whether a replacement of neutrophil count and platelet count by neutrophil-to-lymphocyte ratio (NLR) and platelet-to-lymphocyte ratio (PLR) within the International Metastatic Renal Cell Carcinoma Database Consortium (IMDC) model would improve its prognostic accuracy. Materials and Methods This retrospective analysis included consecutive patients with metastatic renal cell carcinoma treated with first-line tyrosine kinase inhibitors. The IMDC and modified-IMDC models were compared using: concordance index (CI), bias-corrected concordance index (BCCI), calibration plots, the Grønnesby and Borgan test, Bayesian Information Criterion (BIC), generalized R2, Integrated Discrimination Improvement (IDI), and continuous Net Reclassification Index (cNRI) for individual risk factors and the three risk groups. Results Three hundred and twenty-one patients were eligible for analyses. The modified-IMDC model with NLR value of 3.6 and PLR value of 157 was selected for comparison with the IMDC model. Both models were well calibrated. All other measures favoured the modified-IMDC model over the IMDC model (CI, 0.706 vs. 0.677; BCCI, 0.699 vs. 0.671; BIC, 2,176.2 vs. 2,190.7; generalized R2, 0.238 vs. 0.202; IDI, 0.044; cNRI, 0.279 for individual risk factors; and CI, 0.669 vs. 0.641; BCCI, 0.669 vs. 0.641; BIC, 2,183.2 vs. 2,198.1; generalized R2, 0.163 vs. 0.123; IDI, 0.045; cNRI, 0.165 for the three risk groups). Conclusion Incorporation of NLR and PLR in place of neutrophil count and platelet count improved prognostic accuracy of the IMDC model. These findings require external validation before introducing into clinical practice.
The Perception of Psychosis among Young Adults in Southeast Asia: A Singaporean Perspective
Pawel D. Mankiewicz,Wing S. Kam 한국상담학회 2024 Journal of Asia Pacific counseling Vol.14 No.1
Psychosis is a complex mental health condition that may involve experiences of hallucinations, delusional beliefs, high levels of emotional distress, and considerable disruption to daily life. Individuals with this condition experience greater levels of public stigmatisation and discrimination compared to other mental health difficulties. Particularly in collectivistic Asian cultures, those with psychosis often experience social exclusion and internalized shame. To explore the specificity of psychosis-related attitudes in Southeast Asia, this study investigated the perception of such conditions among young adults in Singapore. Qualitative methodology was employed and semi-structured interviews were conducted with study participants. Verbatim data were analysed using inductive thematic analysis embedded in a transparent reflexive approach. Five superordinate themes emerged, as follows: individual perceptions of people with psychosis, social attitudes and behavior towards people with psychosis, individual reactions towards psychosis, perceived causes of psychosis, and sources of knowledge about psychosis. Cultural implications are discussed and practical indications for counsellors are also considered.
Pawel Sikora,Levent Afsar,Sundar Rathnarajan,Morteza Nikravan,정상엽,Dietmar Stephan,Mohamed Abd Elrahman 한국콘크리트학회 2023 International Journal of Concrete Structures and M Vol.17 No.6
The use of alternative and locally available materials is encouraged in the construction industry to improve its sustainability. Desert regions with shortages in freshwater and river sand as fine aggregates in concrete have to search for alternative materials such as seawater, dune sand, and waste glass powder to produce lightweight concretes. The potential negative effects of adding these alternative materials can be reduced by adding nanosilica to the cementitious system at very low quantities. This study evaluates the feasibility of using these alternative materials and nanosilica (NS) in producing lightweight aggregate concretes (LWACs). A systematic study was carried out to understand the synergistic effect of nanosilica and seawater in improving the hydration characteristics of the developed cementitious systems. Also, the effect of these alternative materials on the fresh properties of the cementitious system was assessed by slump flow tests. The evolution of compressive strength at early ages was investigated after 2, 7, and 28 days of moist curing and an improvement in the strength development in concretes with seawater was observed. Furthermore, the integrity of the developed LWACs was analyzed using oven-dry density, thermal conductivity, water porosity and shrinkage measurements. Moreover, the capillary porosity and sorptivity measurements revealed the denser microstructure in the nano-modified seawater lightweight concretes. In the end, the life-cycle assessment study calculated the benefit of alternative materials in terms of carbon footprint and water consumption. As an outcome, a sustainable solution for producing LWACs containing seawater, dune sand or glass powder was proposed.
Determiners in Korean Language?
Pawel Kida 중동유럽한국학회 2016 중동유럽한국학회지 Vol.16 No.-
본 논문은 한국어의 품사를 다루며 관형사에 중점을 둔다. 한국어는 정관사와 부정관사가 없는 언어인 사실이되 많은 논문을 통해서 관형사를 영어로‘ determiners’로 번역하고 또한 다른 용어를 선택하게 되어서 오해가 생긴다. 따라서 본고는 먼저 관형사에 대한 다양한 영어로 번역된 용어를 다루고 차이점을 밝힌다. Wiltschko의 이론을 사용하여‘ determiner’의 중심이 되는 성, 수, 격, 위치의 특징을 설명하고 한국어와 대조한다. 이를 바탕으로 관형사의 특성을 밝히고‘ determiner’이란 용어는 적절하지 않은 결론에 도달하여‘ determiner’ 대신에‘ attributive’이란 용어를 제안한다. This paper examines the structure of nominal phrases in Korean, a language without definite or indefinite articles. In particular, I focus on the issue of 관형사 in Korean. I use the proposal of Martina Wiltschko in describing Korean 관형사, giving the properties of gender, number, case and location. I compare Korean to English and German where the category of determiners is well defined and propose a notion of attributive for 관형사 rather than a determiner.