• 한국HCI학회:학술대회논문집
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• 2008.02b
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• pp.193-198
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• 2008

Now days with the significant grows of internet and PC hardware/software, most of the business, include small size business and soho, is worked by PC/Network. However these critical changes, all the PC/Network system or service is identical and these make user a inconvenient experience and unpleasant aspect to PC/Network. This research is to segment the user bases on the user context of using PC and all this segmentation was done in contextual design process. From Contextual Interview, all data of user context of environment, use case, needs, voices, break downs were captured and these data were interpreted and filtered to affinity notes and user modeling. After the interpretation, the consolidation was being held by affinity diagram, which could make ready to segment the user. For the result, 3 segmentation was evaluated and which are the 'Holistic Networker', 'Unplugged Controller' and 'Passive Reactor'.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.33 no.4
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• pp.312-321
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• 2007

Purpose: Distraction osteogenesis has been applied to the maxillofacial implantology and good experimental and clinical results have been reported. However, histologic studies of implants placement on distraction osteogenesis of atrophic alveolar ridges are scarce. In this study, we compare the bone formation between in the transport part and in the distraction part by histomorphometric analysis. Materials & methods: Three adult beagle dogs were served as experimental subjects. The 2 premolars and 1st molar were extracted on the Lt. side of mandible in each beagle dog. After one month later, osteotomy was performed and distraction device was adapted. Distraction was performed with gradual incremental separation of two bone pieces at a rate of 1.0mm per day for 5 days. During consolidation phase, new bone was formed in the distraction zone between the separated bone pieces. 5 weeks after distraction phase, 3 implants were placed in each beagle dog. The implants were inserted through transport part and distraction part and inferior basal bone. The animals were sacrificed at 2 weeks, 4 weeks, and 12 weeks after implant placement. BIC and BA of implants on distraction part and transport part were measured histomorphometrically. Results: BIC, BA increased after implant placement as time goes by passes and new bone formation was slightly higher in transport part than in distraction part at 2 weeks, 4 weeks after implant placement. At 12 weeks after implant placement, BIC, BA of were 74%, 61% in transport part and 77%, 59% in distraction part, therefore there were no difference in BIC and BA between transport part and distraction part at 12 weeks after implant placement.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.35 no.7
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• pp.745-751
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• 2011

This study proposes finite element modeling of dislocation punching at cooling after consolidation in order to calculate the strength of particle-reinforced aluminum composites. The Taylor dislocation model combined with strain gradient plasticity around the reinforced particle is adopted to take into account the size-dependency of different volume fractions of the particle. The strain gradients were obtained from the equivalent plastic strain calculated during the cooling of the spherical unit cell, when the dislocation punching due to CTE (Coefficient of Thermal Expansion) mismatch is activated. The enhanced yield stress was observed by including the strain gradients, in an average sense, over the punched zone. The tensile strength of the SiCp/Al 356-T6 composite was predicted through the finite element analysis of an axisymmetric unit cell for various sizes and volume fractions of the particle. The predicted strengths were found to be in good agreement with the experimental data. Further, the particle-size dependency was clearly established.

• Journal of the Korean Society of Clothing and Textiles
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• v.34 no.7
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• pp.1162-1174
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• 2010

Excavated gold brocade, often shows signs of serious damage and contamination from environmental factors such as exposure to soil or human remains. Therefore, most of the conservation procedures are focused on the consolidation of the gold thread and on cleaning with water or organic solvents. Indiscreet cleaning using solvents could damage the gold leaf, which identifies the features of fabric. There is a need to develop cleaning protocols appropriate for relics through the careful analysis of the condition of the relics. This study finds the appropriate cleaning method for the excavated gold brocade. Four different cleaning methods, vacuum cleaning, kneaded rubber eraser cleaning, immersion wet cleaning, and absorption wet cleaning were applied to the excavated gold brocade. The degree of cleaning and damage were examined depending on the cleaning methods, changes to the physical condition (before and after cleaning) were also analyzed through the surface observation. Although immersion cleaning showed the best cleaning result, this method had a risk of damage to the gold thread. Absorption wet cleaning safely eliminated the various soluble contaminants and the rotten smell of relics. Kneaded rubber eraser was suitable for the excavated gold brocade fabric because it can be applied to selective parts, intentionally excluding some sensitive parts such as the gold thread. The vacuum cleaning method required special attention because of a possibility of suctioning off loosely attached gold leaf. Dual cleaning, the kneaded rubber eraser cleaning, followed by the absorption cleaning was the most effective method to preserve and clean excavated gold brocade.

• Journal of the Korean Geotechnical Society
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• v.17 no.5
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• pp.43-50
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• 2001

딜라토메터는 실험의 간편성, 경제성, 신속성 및 반복성 등을 바탕으로 현장에서의 지반공학적 물성추정에 보편화되고 있다. 또한 간단한 장비구성과 손쉬운 사용법에도 불구하고 다양한 지반공학적 물성들 -예로서, $K_{o}$ , OCR, $c_{u}$ , $\psi$, $c_{h}$, $k_{h}$, ${\gamma}$, M, $u_{o}$ -을 추정할 수 있으며 다양한 지반공학적 설계문제에 성공적으로 적용되어 왔다. 그러나 제안된 관계식들이 대부분 기존실험 결과들과의 비교를 통하여 얻어진 경험적 상관관계이며, 특히 압밀계수 추정에 관한 부분은 관입시 평면변형 상태의 지반변형으로 인한 관입모사의 복잡성으로 인하여 피에조콘 소산시험 해석을 위해 제안된 이론 해들에 경험적인 가정사항들을 추가하여 사용하는 반경험적 방법들과 순수한 경험적인 방법이 사용되어 왔다. 본 연구에서는 elf라토메터 관입기의 실제 평면적을 등가의 원형반경으로 고려한 등가반경을 사용하고 최적화기법을 적용함으로써, 소산시험에서 실제 관측된 간극수압($p_2$)과 딜라토메터 소산시험을 모사하여 얻어진 예측 간극수압의 차이를 최소화하는 수평압밀계수 추정법을 제안하였다. 제안된 방법을 국내 양산지역에서 수행된 딜라토메터 소산실험에 적용하였으며 추정된 수평압밀계수 값을 기존의 딜라토메터 수평압밀계수 추정법들과 불교란 시료를 이용한 일차원 실내 압밀실험으로 얻어진 수평압밀계수 값들과 비교검증 하였다. 그 결과 제안된 방법으로 기존의 방법에 비해 실내 압밀실험 결과와 일치하는 수평압밀계수 추정결과를 얻었다. 또한, 제안된 방법으로 얻어진 수평압밀계수는 전 소산도 범위에서 고르게 관측값과 일치하는 소산곡선을 예측하여, 최적화기법을 이용한 딜라토메터 소산시험 해석으로 전 소산과정을 대표하는 압밀계수의 추정이 가능할 것으로 사료된다.

• Ocean and Polar Research
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• v.30 no.1
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• pp.119-128
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• 2008

Japan's new Basic Ocean Law took effect in 20 July 2007. This law contains that 1) calls for the consolidation of eight government offices that previously worked separately on maritime issues; 2) establishes a basic plan for maritime matters, and; 3) creates a comprehensive maritime policy headquarters, run by the Prime Minister. The result is a structure for the integrated promotion of maritime policy. The Minister of Land, Infrastructure and Transport has been appointed to the newly established position of maritime minister. Japan has been in conflict with Korea and China over EEZ and territory, which has caused the country to turn to ocean. If Japan puts more emphasis on sea, it will be on a collision course with neighboring countries such as Korea, China, Russia, and Taiwan. Japan has been at odds with these countries; with Korea over Dokdo islets, with China over the Senkaku Islands and the East China Sea, where gas fields lie, with Taiwan over fishery rights in the East China Sea, with Russia over the Kuril Islands. Korea's position about the establishment of Japan's new Basic Ocean Law is followed: 1) expression of Korea's position in maritime resourcces of east china sea, 2) understand of strategy for maritime resources development and maritime delimitation in China and Japan, 3) a caution for extention of EEZ and maritime activities, 4)effective and comprehensive policy establishment, and strength in R&D, 5) construction of active and responsive system for maritime issues in neighbor country.

• Journal of Korean Society of Transportation
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• v.35 no.5
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• pp.447-457
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• 2017

This study aims to analyze the accidents of green mode bicycle. In pursuing the above, this study gave special emphasis on modeling the bicycle accidents reflecting the regional characteristics. The main results are as follows. First, the null hypotheses that the number of accident and ratio of serious injury and fatality (FSI) were the same over regions were rejected. Second, as the common variables, the number of bicycle was judged to have positive (+) impact to the accidents and the bicycle using ratio was inferred to increase the ratio of FSI. Third, the elderly population ratio among 3 factors which gave impact to the accidents of Si_A (city-county consolidation) was concluded to have the greatest elasticity. The developed area ratio between 2 factors in Si_B (city which is not consolidated) was, however, estimated to have the higher elasticity. Fourth, the number of car registration among 5 accident factors of Gun (county) was analyzed to have the greatest elasticity. Finally, the commuting trip ratio among 7 accident factors of Gu (district) was judged to have the greatest elasticity. This study can be expected to give some implications to regional policy-making related to bicycle.

• The Journal of Engineering Geology
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• v.18 no.3
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• pp.245-255
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• 2008

The variation of the electrical property of embankment material was analyzed from laboratory experiments and the result of field survey, in order to enhance the interpretation of electrical resistivity survey frequently used for safety assessment of embankment. At first, the kaolinite, showing similar physical property with core material of embankment, was used to examine the variation of the resistivity value according to degree of consolidation. The test showed that a drop of shear strength induces increase of resistivity value regardless of degree of water content. This result means that porous zones of weak core material in embankment may be appeared as highly resistive part in the electrical resistivity survey. This observation implies that it may fail to detect weak core material by electrical method, if we only try to and zones showing low resistivity value. And, we performed Standard Penetration Test (SPT) to analyze the correlation between electrical property and ground stiffness. Finally, a mechanism to describe the variation of electrical resistivity due to grouting effect was proposed and real field data were analyzed.

• Journal of Korea Foundry Society
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• v.31 no.1
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• pp.26-30
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• 2011

For the fabrication of bulk near-net-shape Ti-Ni-Cu shape memory alloys, consolidation of Ti-Ni-Cu alloy powders are useful because of their brittle property. In the present study, $Ti_{50}Ni_{30}Cu_{20}$ shape memory alloy powders were prepared by gas atomization and martensitic transformation temperatures and microstructures of those powders were investigated as a function of powder size. The size distribution of the powders was measured by conventional sieving, and sieved powders with the specific size range of 25 to $150\;{\mu}m$ were chosen for this examination. XRD analysis showed that the B2-B19 martensitic transformation occurred in the powders. In DSC curves of the as-atomized $Ti_{50}Ni_{30}Cu_{20}$ powders as a function of powder size, only one clear peak was found on each cooling and heating curve. The martensitic transformation start temperature($M_s$) of the $25-50\;{\mu}m$ powders was $31.5^{\circ}C$. The $M_s$ increased with increasing powder size and the difference of $M_s$ between $25-50\;{\mu}m$ powders and $100-150\;{\mu}m$ powders is only $1^{\circ}C$. The typical microstructure of the rapidly solidified powders showed cellular morphology and very small pores were observed in intercellular regions.

• Journal of the Korean Geotechnical Society
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• v.18 no.3
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• pp.105-112
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• 2002

Increases in excess pore water pressure without change of surcharge load were reported in clay underneath embankment at Berthierville and Olga sites after the end of construction. These abnormal phenomena could not be explained by classical consolidation theory. This paper presents a nonlinear viscoplastic model to interpret an increase in pore water pressure on natural clay, The proposed model can consider the combined processes of pore water pressure dissipation according to Darcy's law and pore water pressure generation due to viscoplastic strain, as well as time-dependent viscoplastic behaviour and strain rate dependency of preconsolidation pressure. The calculated results using numerical analysis are compared with measured ones under embankments built on soft clay at Berthierville and Olga in Quebec, Canada. It may be possible to explain the phenomenon of excess pore water pressure increase after the end of construction using the proposed nonlinear viscoplastic model.