• Proceedings of the Korea Concrete Institute Conference
• /
• 1999.10a
• /
• pp.541-544
• /
• 1999

The main objective of this study is to develope the PSC-I girder for long span bridge. This study investigates the structural behavior of Postcracking stage and efficiency of proposed PSC-I girder using 1/2 scaled prototype beam specimen. Three specimens are tested under three point static loading system. Ideally, the Load-displacement relationship is trilinear. The crack patterns and failure mode of each specimen are reported in this paper and they are compared to each other with ductility and strength.

• Proceedings of the Korea Concrete Institute Conference
• /
• 1999.04a
• /
• pp.519-524
• /
• 1999

A bulb-tee sectioned girder is proposed for long span bridge exceeding 40 meters. The proposed bulb-tee girder is developed by non-linear analysis process. This study investigates the structural behavior and efficiency of proposed bulb-tee sectioned girder using 1/2 scaled prototype beam specimen. Three specimens are tested under three point static loading system. The crack patterns, failure mode and ultimate load capacity of each specimen are reported in this paper and they are compared to each other.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2009.05a
• /
• pp.105-106
• /
• 2009

The flexural performance of high-strength concrete beams reinforced with steel fibers is described. This study aims at determining the structural behavior of steel fiber reinforced concrete beams such as failure mode, capacity in flexure, crack patterns, strains in concrete.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2003.11a
• /
• pp.132-135
• /
• 2003

Mechanical anchorage can substitute a standard hook. To enhance the workability and economical benefit of mechanical anchorage, the size of anchor plate should be optimized. In this paper, the pull-out behaviors such as strength, failure mode, and crack patterns of mechanically anchored reinforcement in concrete are investigated using nonlinear finite element analysis. The nonlinear finite element analysis results are consistent with the experimental results. These results show that the optimal anchor plates can be designed using the nonlinear finite element analysis.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2010.05a
• /
• pp.101-102
• /
• 2010

The flexural performance of high-strength prestressed concrete (PSC) beams reinforced with steel fibers is described. This study aims at determining the structural behavior of steel fiber reinforced concrete beams such as failure mode, capacity in flexure, crack patterns, strains in concrete.

• 대한두경부종양학회:학술대회논문집
• /
• 1989.11a
• /
• pp.18.2-20
• /
• 1989

• 대한두경부종양학회:학술대회논문집
• /
• 2007.11a
• /
• pp.206-206
• /
• 2007

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.16 no.1
• /
• pp.263-271
• /
• 2016

Software requirement analysis is necessary for successful software development project. Specially, incomplete requirement is the most influential causes of software project failure. Incomplete requirement can bring late delay and over budget because of the misunderstanding and ambiguous criteria for project validation. Software requirement patterns can help writing more complete requirement. These can be a reference model and standards when author writing or validating software requirement. Furthermore, when a novice writes the software scenario, the requirement patterns can be one of the guideline. In this paper proposes an automatic approach to identifying software scenario patterns from various software scenarios. In this paper, we gathered 83 scenarios from eight industrial systems, and show how to extract 54 scenario patterns and how to find omitted action of the scenario using extracted patterns for the feasibility of the approach.

• The korean journal of orthodontics
• /
• v.35 no.3 s.110
• /
• pp.207-215
• /
• 2005

This study was performed to evaluate clinical practicality of the rebonding method with flowable resin without the removal of the residual resin on the debonded theeth and debonded bracket base after debonding. The samples of the control group (group I) were rebonded with Transbond XT using the usual rebonding method after the residual resin was removed. At experimental group, the brackets were rebonded with Transbond XT(group II) and CharmFil Flow (group III) without removal of residual resin which is the possibility becoming the index (or rebonding to similar position With initial bonding. The Shear bond Strength of the each group was measured. Patterns of bonding failure were evaluated with modified ARI score. and the shear bond strength according to patterns of bonding failure at experimental group was compared. Between the control group $(6.51\pm1.21MPa)$ and the group II rebonded with Transbond XT $(6.30\pm1.01MPa)$ did not have significantly difference in the shear bond strength (p=0.534), and the shear bond strength of group II was Significantly lower 4han the group III rebonded With CharmFil Flow $(7.29\pm1.54 MPa)$ (P=0.009). At control group, there was not large difference if distribution of bending failure pattern. But at experimental group, bond failure did not occur in interface between the resin-enamel. and bond failure between the resin-bracket, within the resin was distributed similarly. There was not significantly difference in the shear bond strength according to patterns of bonding failure at experimental group (P>0.05) The result of this study showed that the method suggested in this study aid flowable resin as rebonding adhesive could be useful in clinically.

• Radiation Oncology Journal
• /
• v.14 no.4
• /
• pp.291-297
• /
• 1996

Purpose : This study was performed to evaluate survival, failure patterns, and prognostic factors of MMR patients after radiation therapy. We also discussed the need for chemotherapy. Materials and Methods : A retrospective analysis was done for 23 patients with MMR who were treated with radiation therapy from June 1985 to November 1992. There were 19 male and 4 female patients, The patients' age ranged from 17 to 71 years (median 39 years). Systemic symptoms including fever, weight loss, or malaise were found in $30\%$ of the patients. The nasal cavity was most frequently involved No patients had nodal involvement at diagnosis. There were 2 patients with distant metastasis at presentation. Radiation therapy was delivered five times a week, 1.8 Gy daily, total $45\~54$ Gy (median 50.4 Gy) using 6 MV X-ray No patients received chemotherapy as initial treatment. Results : Overall 5-year and 10-year survival rates were $52.4\%$ and $44.1\%$, respectively. Seventy Percent(12/17) of the patients achieved complete response to radiotherapy, and $29.4\%$ (5/17) achieved partial response. The Patients with complete response showed a better 5-year survival rate than those with partial response ($66.9\%$ vs. $20\%$. p=0.004). Symptom duration before diagnosis, the presence of systemic symptom, and the number of primary sites had no influence on survival. The patterns of failure were as follows: local failure(1), failure in adjacent site(1), local and distant failure(1) distant metastasis(2). and conversion to malignant lymphoma(1). We could not find factors associated with the patterns of failure. Conclusion : The most important facto associated with survival was the response to radiotherapy. Seventeen percent of the patients had distant metastasis, and the salvage after distant metastasis was not successful. However. about $50\%$ of the patients could achieve long-term survival with local radiation therapy alone. Therefore, chemotherapy of MMR should be done after a prospective randomized study for the factors associated with distant metastasis.