Yongwook Jeong

Bio: Yongwook Jeong is an academic researcher from Sejong University. The author has contributed to research in topics: Models of communication & Crime prevention. The author has an hindex of 7, co-authored 21 publications receiving 265 citations. Previous affiliations of Yongwook Jeong include Samsung SDS & University of California, Berkeley.

User-centric knowledge representations based on ontology for AEC design collaboration

Abstract: Fostering collaboration in the AEC (Architecture/Engineering/Construction) field is difficult, due to the differing educational and disciplinary backgrounds of the participants. Current approaches to managing such collaboration in the AEC industry often fail to overcome the disciplinary differences among the participants, resulting in cost overruns, missed schedules, and diminished satisfaction of the clients or society. Their failure is due to the lack of understanding of the nature of multi-disciplinary design and the lack of tools that can support them. The primary objective of this research is to establish a suitable model for machine-mediated collaboration. In contrast to the monolithic model, which is insensitive to changes, we propose to develop a distributed and flexible model, where each domain of expertise retains its own data in the form most appropriate for its needs, and where ontology-based, intelligent filters translate neutral design data into domain-specific ones. The filtered data appear semantically-rich to the participant, even when it was generated by another participant. To verify the feasibility of the proposed filter-based communication model, we developed and tested a prototype. The result of the prototype test demonstrates that the proposed model can enable designers from different disciplines participating in an AEC project to better understand the dynamic process of design and achieve a high level of shared understanding.

Enablers and barriers of the multi-user virtual environment for exploratory creativity in architectural design collaboration

Abstract: Pioneering psychology and co-design research has highlighted the potential that multi-user virtual environment (MUVE) may help architects’ exploratory creativity that is a recursive search to discover an optimal match of novel and appropriate solutions. However, it has been not reported hitherto in what ways MUVE helps or obstructs architects’ exploratory creativity in individual and collaborative modes of collaboration. To investigate this issue, we compared MUVE and sketching media in face-to-face and remote collaboration modes, involving 22 pairs of architecture major students. Based on interview and video-observation, we discovered that (1) in MUVE, anthropomorphic avatars, which other media do not have, enabled individual and collaborative explorations to discover unexpected affordances of new solutions, with evaluation on physical properties and layouts of solutions. In addition, (2) co-presence with collaborator’s avatars enabled inspiration on new ways of problem-solving and puzzle-making ...

Hyper-Nutrient Enrichment Status in the Sabalan Lake, Iran

Abstract: Lakes/reservoirs are rapidly deteriorating from cultural eutrophication due to anthropogenic factors. In this study, we aimed to (1) explore nutrient levels in the Sabalan dam reservoir (SDR) of northwest Iran, (2) determine the reservoir water fertility using the total phosphorus (TP) based and total nitrogen (TN) based Carlson trophic state indices, and (3) specify primary limiting factors for the reservoir eutrophication. Our field observations showed a state of hyper-nutrient enrichment in the SDR. The highest variation of TN in the reservoir water column happened when the reservoir was severely stratified (in August) while the highest variation of TP took place when the thermocline was attenuated with the deepening of the epilimnion (in October). Both TP and TN based trophic indicators classified the SDR as a hypereutrophic lake. TN:TP molar ratio averaged at the epilimnion indicated a P–deficiency in the reservoir during warm months whilst it suggested a co–deficiency of P and N in cold months. Given the hyper-nutrient enrichment state in the reservoir, other drivers such as water residence time (WRT) can also act as the main contributor of eutrophication in the SDR. We found that WRT in the SDR varied from hundreds to thousands of days, which was much longer than that of other reservoirs/lakes with the same and even much greater storage capacity. Therefore, both hyper-nutrient enrichment and WRT mainly controlled eutrophication in the reservoir. Given time consuming and expensive management practices for reducing nutrients in the watershed, changes in the SDR operation are suggested to somewhat recover its hypereutrophic state in the short-term. However, strategic long-term recovery plans are required to reduce the transition of nutrients from the watershed to the SDR.

经验与教育 = Experience and education

Abstract: Experience and Educationis the best concise statement on education ever published by John Dewey, the man acknowledged to be the pre-eminent educational theorist of the twentieth century. Written more than two decades after Democracy and Education(Dewey's most comprehensive statement of his position in educational philosophy), this book demonstrates how Dewey reformulated his ideas as a result of his intervening experience with the progressive schools and in the light of the criticisms his theories had received. Analysing both "traditional" and "progressive" education, Dr. Dewey here insists that neither the old nor the new education is adequate and that each is miseducative because neither of them applies the principles of a carefully developed philosophy of experience. Many pages of this volume illustrate Dr. Dewey's ideas for a philosophy of experience and its relation to education. He particularly urges that all teachers and educators looking for a new movement in education should think in terms of the deeped and larger issues of education rather than in terms of some divisive "ism" about education, even such an "ism" as "progressivism." His philosophy, here expressed in its most essential, most readable form, predicates an American educational system that respects all sources of experience, on that offers a true learning situation that is both historical and social, both orderly and dynamic.

Properties Of Concrete

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VALIDITY OF CUBIC LAW FOR FLUID FLOW IN A DEFORMABLE ROCK FRACTURE - eScholarship

Abstract: The validity of the cubic law for laminar flow of fluids through open fractures consisting of parallel planar plates has been established by others over a wide range of conditions with apertures ranging down to a minimum of 0.2 µm. The law may be given in simplified form by Q/Δh = C(2b)3, where Q is the flow rate, Δh is the difference in hydraulic head, C is a constant that depends on the flow geometry and fluid properties, and 2b is the fracture aperture. The validity of this law for flow in a closed fracture where the surfaces are in contact and the aperture is being decreased under stress has been investigated at room temperature by using homogeneous samples of granite, basalt, and marble. Tension fractures were artificially induced, and the laboratory setup used radial as well as straight flow geometries. Apertures ranged from 250 down to 4µm, which was the minimum size that could be attained under a normal stress of 20 MPa. The cubic law was found to be valid whether the fracture surfaces were held open or were being closed under stress, and the results are not dependent on rock type. Permeability was uniquely defined by fracture aperture and was independent of the stress history used in these investigations. The effects of deviations from the ideal parallel plate concept only cause an apparent reduction in flow and may be incorporated into the cubic law by replacing C by C/ƒ. The factor ƒ varied from 1.04 to 1.65 in these investigations. The model of a fracture that is being closed under normal stress is visualized as being controlled by the strength of the asperities that are in contact. These contact areas are able to withstand significant stresses while maintaining space for fluids to continue to flow as the fracture aperture decreases. The controlling factor is the magnitude of the aperture, and since flow depends on (2b)3, a slight change in aperture evidently can easily dominate any other change in the geometry of the flow field. Thus one does not see any noticeable shift in the correlations of our experimental results in passing from a condition where the fracture surfaces were held open to one where the surfaces were being closed under stress.

Group Genius: The Creative Power of Collaboration

Abstract: Group Genius: The Creative Power of Collaboration; Keith Sawyer; Basic Books, NY, 2007; 274 pp., $26.95. If you're involved in a business that depends on sustained innovation (and which doesn't?)-especially if you're a manager who can influence decisions and resources-then add this to your reading list. Keith Sawyer's writing is direct, clear, even friendly, and the text is unencumbered by ponderous footnotes and thick quotations. An associate professor of psychology at Washington University, St. Louis, Sawyer's personal hobbies of jazz and improv theater appear again and again to support his thesis that innovation is a product of groups, and that the solitary genius is a myth. But the scope of the book is more than that: it covers the important and current thinking about fostering innovation in the Internet-enabled age. By my own reading and experience in a research-driven Fortune 500 corporation, the innovation literature is converging on a number of "best practices." Sawyer captures them well, and with his well-chosen supporting anecdotes these are reason enough to read the book and get to work applying these lessons in your organization: * Poorly structured, lazy brainstorming is practiced so frequently and is so wasteful, we can't have enough books that reveal its flaws and how to improve upon it. Sawyer's treatment is excellent. * Sustained innovation depends on having many irons in the fire, with the corollary that failure will be frequent and must be supported. * Myths about lone geniuses need bursting. Even those who work alone stand on the shoulders of giants, and implementation always needs teamwork and has its own continuing need for creative problem solving. The risk of propagating the solitary genius concept (to the exclusion of other possibilities) is that organizations will fail to support "messy" teams. * Innovation happens at the "edge of chaos"; either too much or too little structure is destructive. * Clusters are important. It may seem risky to have many firms in one location competing for a common pool of talent, but history shows that a crossfertilizing, dynamic environment is more innovative and sustainable. * The Internet and related communications standards are flattening the world at an unprecedented pace; the Web empowers enormous networks of individual innovators. Standing still is not an option. Group Genius also benefits from: * Annotated Notes: Sawyer has made a wise choice to keep the prose simple and fast-moving, but as a result, major ideas sometimes jump off the page as bald assertions (for example, ". . . the most effective . . . groups are self-managing. . . . without being directed by a leader."). The annotated notes at the end of the book provide good counterweight and credibility to the breezy style. * Frequent Checklists: The book is sprinkled with bulleted lists of do's and don'ts, which stitch the storytelling narrative together into practical advice. …