• Magazine of the Korean Society of Agricultural Engineers
• /
• v.40 no.5
• /
• pp.59-67
• /
• 1998

The object of this study is to investigate the strength characteristics and the freeze-thaw resistance of high strength concrete incorporating fine blast furnace slag. Major experimental variables were the water/cement ratio, maximum size of coarse aggregate, and cement types such as ordinary portland and slag cement. The results were as follows ; The workability of fresh concrete incorporating fine blast furnace slag was better than that of OPC(ordinary Portland cement) in terms of slump. The freeze-thaw resistance showed better than that of OPC, keeping more than 90% of relative modules of elasticity after 506 cycles and showing only a hair crack at surface without serious damage. Thus, the fine blast furnace slag might be recycled at concrete to make high strength concrete at fields.

• Nuclear Engineering and Technology
• /
• v.43 no.1
• /
• pp.45-62
• /
• 2011

The Korean nuclear industry is developing a thermal-hydraulic analysis code for safety analysis of pressurized water reactors (PWRs). The new code is called the Safety and Performance Analysis Code for Nuclear Power Plants (SPACE). The SPACE code adopts advanced physical modeling of two-phase flows, mainly two-fluid three-field models which comprise gas, continuous liquid, and droplet fields and has the capability to simulate 3D effects by the use of structured and/or nonstructured meshes. The programming language for the SPACE code is C++ for object-oriented code architecture. The SPACE code will replace outdated vendor supplied codes and will be used for the safety analysis of operating PWRs and the design of advanced reactors. This paper describes the overall features of the SPACE code and shows the code assessment results for several conceptual and separate effect test problems.

• 보존과학연구
• /
• s.27
• /
• pp.215-226
• /
• 2006

In the field conservation treatment, it is important that the method chosen to lift an object out of the ground depends on its surrounding weather, strength, size, composition, and condition. This paper describes a physical support(Urethane bandage, De naturation - polyisoprene resin) created for lifting delicate relics in this field. The advantage of Urethane bandage method is of conveniently portable size, and it's convenient for use, while curing time is very fast.(approx. 5~10minute)Denaturation -polyisoprene resin is able to be soft by the hot water(approx. $60^{\circ}C$ ). so it's good to stick to the relic surface of an indeterminate form. The results of use of these reinforcement methods are of utility value.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
• /
• v.6 no.1
• /
• pp.31-52
• /
• 1993

The object of thes research is to lucidate the clinical effects of Gami-Cheongshimyeonjayeum on the anti-allergic and gimmune response to rats and mice. The obtaind results of Gami-Cheongshimyeonjayeum administration are as follows : 1. The cytotoxic index increased slightly at over concentration $1{\times}10^{-2}/ml$, but it is thought that the cytotoxic effect show no significant value under the concentration $1{\times}10^{-3}/ml$. 2. Gami-Cheongshimyeonjayeum water extract seems to suppress the leakage volume of Evans blue to decrease the vascular permeability. 3. Gami-Cheongshimyeonjayeum show the inhibitory effect of footpad edema. 4. Protein leakage is inhibited by the administration of Gami-Cheongshimyeonjayeum. 5. The delayed type hypersensitivity to SRBC is suppressed at the 24hours after the administration of Gami-Cheongshimyeonjayeum on the experimental group 1, 2. 6. Hemolysin and hemagglutinin titer, and RFC increase to bulid up the immune function.

• Transactions of Materials Processing
• /
• v.12 no.4
• /
• pp.388-393
• /
• 2003

Electrolytic polishing is the anodic dissolution process in the transpassive state. It removes non-metallic inclusions and improves mechanical and corrosion resistance of stainless steel. Electrolytic polishing is normally used to remove a very thin layer of material from the surface of a metal object. An electrolyte of phosphoric acid 50% in vol., sulfuric acid 20% in vol. and distilled water 30% in vol. has been used in this study. In the low current density region, there can be found plateau region and material removal process and leveling process occur successively. In this study, an electrochemical polishing process using pulse current is adopted as a new electrochemical polishing process. In electrochemical machining processes, it has been found that pulse electrochemical processes provide an attractive alternative to the electrochemical processes using continuous current. Hence, this study will discuss the electrochemical polishing processes in low current density region and pulse electrochemical polishing.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2000.10b
• /
• pp.1255-1260
• /
• 2000

The service life is defined as the period of the period of time, until repair becomes necessary to maintain the serviceability of structures. It is getting more common to specify the service life of a structure, particularly structures exposed to de-icing salt water. To accomplish this study, pier in the harbor was chosen as a experimental area. The service life of decks in marine environment was calculated as sum of three period ; initiation period, propagation period and cracking period. The object of this study is to indicate where and how measures can be adopted for checking relevant service lifes.

• Journal of the Korean Institute of Rural Architecture
• /
• v.2 no.2
• /
• pp.75-88
• /
• 2000

This study is based on the Ecological Design Theories related with the Urban space planning. The purpose of this study is to propose the Urban Space Design Method in consideration of Ecological Environment. To achieve this purpose, Normative Theory Study which means Logical Analysis of Ecological Theories in the new field of Ecological Urban Design, is done in accordance with the object of this study. This results derived of this study are as follows: 1. Six(6)-Ecological Urban Planning Elements related with the purpose of this study, are clarified these are Land-use planning, Transformation planning, Plants and Living-thing Ecological System planning, A Culture planning related with water, Energy and resource planning, and Urban-amenity planning. 2. Urban Space Design Method in consideration of Ecological Environment is porposed by means of the Normative theroy study analysis and contents analysis related with Ecological Urban planning which contain Ecological Planning Elements.

• KIEAE Journal
• /
• v.6 no.2
• /
• pp.59-66
• /
• 2006

Green Roof Systems are embossed that realize ecological architecture as a substantially alternative plan. So, a Purpose of the study is seeking to optimize expectation effect through the Green Roof System. we set possible object and propose the prototype on the basis of the existing Green roof System technologies. We visualize a proposed Prototype apply various materials and methods. and we analyse the effects of Green Roof System upon our City climate with use energy efficiency comparison the Green roof system with the Concrete Rooftop. We'll Provide the low data for The prospects of City climate improvement through the a ripple effect on Green Roof System and for activation of Green Roof Technology.

• International Journal of Naval Architecture and Ocean Engineering
• /
• v.8 no.4
• /
• pp.320-329
• /
• 2016

An implicit method of solving the six degree-of-freedom rigid body motion equations based on the second order Adams-Bashforth-Moulten method was utilised as an improvement over the leapfrog scheme by making modifications to the rigid body motion solver libraries directly. The implementation will depend on predictor-corrector steps still residing within the hybrid Pressure Implicit with Splitting of Operators - Semi-Implicit Method for Pressure Linked Equations (PIMPLE) outer corrector loops to ensure strong coupling between fluid and motion. Aitken's under-relaxation is also introduced in this study to optimise the convergence rate and stability of the coupled solver. The resulting coupled solver ran on a free floating object tutorial test case when converged matches the original solver. It further allows a varying 70%-80% reduction in simulation times compared using a fixed under-relaxation to achieve the required stability.

• The Bulletin of The Korean Astronomical Society
• /
• v.36 no.1
• /
• pp.41.2-41.2
• /
• 2011

P/2010 A2, a main-belt asteroid having comet-like dust trail was discovered in January 2010, but the origin of the trail is controversial. Moreno et al. (2010) reported water-ice sublimation as a mechanism for the comet-like activity, whereas other researches (Jewitt et al. 2010; Snodgrass et al. 2010) stated that impact collision contributed to the dust trail. For asteroids are categorized based on spectral shape, optical observation using different color filters makes it possible to determine the taxonomic type of P/2010 A2 nucleus, thus gives an answer to the question of activation mechanism of the object. In this presentation, we report multiband observation of P/2010 A2 in January and March 2010 with 1-meter telescope of Ishigaki-Jima Astronomical Observatory. We employed three broadband filters of g', Rc, and Ic. In this presentation, we focus on the data acquisition, the reduction and the derivation of the reflectance spectrum of debris in the trail. Finally we discuss the potential cause of dust ejection from this asteroid.