• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.21 no.6
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• pp.961-967
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• 2012

The metal is frequently used in the air-conditioner frame, which must have the durability from the various external environments, but has difficulties in being manufactured for many complex shapes. On the other hand, the plastic, used as a material of injection molding, enables the realization of various shapes and the mass-production of complex ones and leads low production cost. As the air-conditioner frame becomes increasingly complex and detailed, the plastic material is highlighted as an alternative for the frame. But the product molded by plastic with a complex shape might have a noise problem. Therefore this study attempts to design the product through TRIZ in order to reduce the noise of the air-conditioner with the frame of plastic material.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.1351-1352
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• 2010

• The Journal of the Korea Contents Association
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• v.11 no.10
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• pp.85-92
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• 2011

Greimas's Carre Semiotique, as Floch showed in his analysis of car, has much effectiveness not only in theoritical aspect but also in practical aspect. This paper used his theory to analysis the value system of MMORPG. Lineage, the game known as representative game of 'nogada', was the starting point. WOW is supposed to have opposition relation with lineage and Ragnarok contradiction relation, and Mabinogi non contradiction relation. As well as games, the concepts that match to 'nogada' of lineage are also supposed. The value system of games is expected to be useful in further systematic analysis of games and also in practical area of design and marketing.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.2 no.2
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• pp.25-31
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• 2001

The TRIZ theory which was invented by Russian scientist Genrich Altshuller provides a systematic methodology for innovative engineering design in place of brainstorming. synectics, analogical thinking, which seeming1y high efficiency are still variations of the trials and errors method. TRIZ theory gives designer the ability to explore design solutions in fields other than his (her) own experience. Among several TRIZ theories, most widely used techniques in engineering field are contradiction theory. Su-Field analysis, physical phenomenon and effect and directed production evolution. which are described in this thesis and its application to conceptual design of high-speed train is performed as a case study of TRIZ theory.

• Journal of Engineering Education Research
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• v.19 no.1
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• pp.3-10
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• 2016

This study was conducted to identify Korea's TRIZ research trends and to propose implications for setting a direction for future TRIZ research by analyzing TRIZ-related research over the past 15 years, or from 1998 to 2013. The subjects in this study were 256 published studies, including 149 studies in academic journals, 97 master theses, and 10 doctorate theses. This study reached the following conclusion. First, academic journals were the most frequent form of publication of TRIZ-related studies, followed by master's degree theses, and doctorate theses. Second, two or more TRIZ tools were used to solve problems and the most frequently used topic was technical contradiction as the result of frequency analysis for TRIZ research topics. This signified that it was easier to solve problems when various TRIZ tools were used, rather than applying a single TRIZ tool while technical contradiction was considered to be actively used as it allowed the relatively easy understanding of TRIZ. Third, the use of TRIZ research topics had increased and diversified each year. This could be interpreted to be based on the increased understanding of TRIZ. Fourth, case studies and experimental research were the most frequently used methods in TRIZ-related research. This was because various TRIZ tools were applied on problem solving situations, which were directly proposed as the research result. Fifth, the use of TRIZ was increasing in the educational field. Specifically, it was noted that TRIZ was used in creativity education with the use of 40 invention principles in elementary, middle, and high schools.

• Journal of The Korean Association For Science Education
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• v.19 no.4
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• pp.560-569
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• 1999

This study was conducted with two science classes of the 8th grade students in Seoul during 4 weeks. The numbers of students in the classes were 37 and 38, and they were taught for 12 class hours. Questions obtained for 12 class hours from 75 students were analyzed and grouped into patterns. All together 1.108 questions from the students were classified into six categories: 'No Connection' (7%). 'Contradiction' (3%), 'Recall' (23%), 'Reframe' (40%), 'Application' (18%), and 'Extension' (9%). Irrelevant questions to learning and questions of false proposition were classified into 'No Connection' and 'Contradiction', respectively. Questions repeating what were already explained were grouped into 'Recall'. Those requiring other examples and/or additional explanations were grouped into 'Reframe'. Those requiring practical applications and/or explanations for other concrete facts were grouped into 'Application'. Finally. Questions for higher and/or other concepts were grouped into 'Extension'. We also discussed educational implications of the above categorized questions in this study.

• Asian Pacific Journal of Cancer Prevention
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• v.15 no.8
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• pp.3687-3690
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• 2014

MicroRNA 200c is a microRNA 200 family member that plays an important role in regulation of the epithelial-to-mesenchymal transition (EMT). The prognostic value of microRNA 200c in solid tumors remains controversial because of inconsistent data. Here, we report a meta-analysis of the association of microRNA 200c expression and survival in patients with solid tumors. Pubmed was searched up to November 2013 for studies investigating microRNA 200c expression and overall survival (OS) in solid tumors. Hazard ratios (HRs) with 95% confidence intervals (CIs) for OS were extracted from each study. Pooled HR and CIs were calculated using the Mantel-Haenszel fixed-effects models. A total of five studies evaluating colorectal cancer, gastric cancer, ovarian cancer, pancreatic cancer and endometrial cancer were included in the analysis. Data were divided into tissue microRNA 200c expression group and serum microRNA 200c expression group. The combined HRs [95%CIs] estimated for OS were 0.62 [0.42-0.91] and 2.16 [1.32-3.52] respectively. Low expression of microRNA 200c in tumor tissue and high expression of microRNA 200c in serum are associated with worse survival in solid tumors. Further study is needed to elucidate this contradiction.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.01a
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• pp.137-140
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• 2018

In this paper, a new design method for the RF photonics system using the TRIZ proposes. A noble design scheme the RF photonics system configurations was obtained after application of the TRIZ contradiction analysis.

• Journal of the Korean School Mathematics Society
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• v.26 no.1
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• pp.21-47
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• 2023

This study examines the activity system of teaching and learning about informal statistical inference using sampling simulation, based on cultural-historical activity theory. The research explores what contradictions arise in the activity system and how the system changes as a result of these contradictions. The participants were 20 elementary school students in the 5th to 6th grades who received classes on informal statistical inference using sampling simulations. Thematic analysis was used to analyze the data. The findings show that a contradiction emerged between the rule and the object, as well as between the mediating artifact and the object. It was confirmed that visualization of empirical sampling distribution was introduced as a new artifact while resolving these contradictions. In addition, contradictions arose between the subject and the rule and between the rule and the mediating artifact. It was confirmed that an algorithm to calculate the mean of the sample means was introduced as a new rule while resolving these contradictions.

• The Korean Journal of Applied Statistics
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• v.24 no.2
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• pp.315-321
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• 2011

Gene expression microarray data often include multiple missing values. Most gene expression analysis (including gene clustering analysis); however, require a complete data matric as an input. In ordinary clustering methods, just a single missing value makes one abandon the whole data of a gene even if the rest of data for that gene was intact. The quality of analysis may decrease seriously as the missing rate is increased. In the opposite aspect, the imputation of missing value may result in an artifact that reduces the reliability of the analysis. To clarify this contradiction in microarray clustering analysis, this paper compared the accuracy of clustering with and without imputation over several microarray data having different missing rates. This paper also tested the clustering efficiency of several imputation methods including our propose algorithm. The results showed it is worthwhile to check the clustering result in this alternative way without any imputed data for the imperfect microarray data.