• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.2B
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• pp.168-175
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• 2011

In modem society, human relationships has been received much attention as important element to judge the success as well as the social life of the individual. To respond to these changing times has been used various ways to maintain an appropriate relationship that each other's character can be predicted. In this paper, we should be carried out a study on correlation analysis and features of five-character types to extract shape of philtrum, mouth, ears in facial image of Men in the 20's for Interview system application. From this, we extracted to area of philtrum, mouth, ears by Visual C++ to face and side image. Then we performed analysis, comparison a group of S-character types to find a result according to philtrum rate, mouth size, shape of ears. As a result, we drew a significance through morphological results by philtrum rate, mouth size, shape of ears as five-character types.

• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.2
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• pp.31-37
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• 2010

Shape conversion coefficient and equivalent diameter for changing 2D image to 3D image by the Digital Image Process(DIP) have been suggested and modified particle size distribution curve has been showed. Couple of aggregates, like two different marine aggregates and two different crushed stones, have been employed. The measured flatness ratios of each aggregate were 0.30, 0.36, 0.47 and 0.83, respectively. Also, the conversion shape coefficients of each aggregate were determinded as 0.77, 0.78, 0.84 and 0.92. The size of aggregate has been modified by multiplying the shape conversion coefficient and the aggregate size from DIP. The modified gradation curve with modified volume and weight of aggregate has been suggested. Within the limited test results, DIP is one of useful to get the particle shape of aggregate with limitation of measuring errors and to apply the particle distribution curve.

• Journal of the Microelectronics and Packaging Society
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• v.18 no.4
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• pp.27-32
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• 2011

Tin nanoparticles were synthesized at room temperature by a compulsive reduction reaction using tin(II) acetate and tin(II) chloride precursors. When an identical amount (0.015 g) of polyvinyl pyrrolidone (PVP) was added, it was concluded that the probability of abnormally big particles forming increased with an increase in PVP molecular weight, resulting in the wide distribution of Sn nanoparticles. Differential scanning calorimetry measurements were carried out using diethylene glycol solution containing synthesized tin nanoparticles. When the population of specific particles with sizes below 35 nm was adequate, the melting point depression peaks of tin nanoparticles corresponding to the specific size were observed besides an evaporation endothermic peak of DEG during the first heating. Because DEG was evaporated and tin nanoparticles in contact became molten and coarsened during the first heating, a melting peak of bulk tin was only observed at $232^{\circ}C$ during the second heating.

• Journal of the korean veterinary medical association
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• v.46 no.6
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• pp.527-543
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• 2010

구제역은 소 돼지 사슴 면양 산양 고라니 노루 등 우제류 동물에서 발생하는 제1종 가축전염병으로 빠른 시간내에 동물의 입 발굽 젖꼭지 등에 수포를 형성하는 것이 특징이다. 감염된 소의 혓바닥, 잇몸, 입술, 입 내부점막, 주둥이에 크기가 다양한 수포가 형성된다. 심한 경우에 혀 전체 넓은 부위에서 궤양이 형성될 수 있다. 수포는 24시간이내에 정상적으로는 파열되며, 그 수포액은 $10^8/ml$의 역가를 갖는 바이러스를 함유한다. 상피가 떨어지고, 유연이 심해지며, 타액이 입 주변에 흔건히 흘러내린다. 입 주변 병변과 동시 또는 이어서 수포가 발굽에 형성되며, 부분적으로 발굽갓띠 또는 제부의 갈라진 틈에서 생성되어 통증과 파행의 원인이 된다. 수포는 보통 유두와 유방에 발생되며, 때로는 세균성 유방염을 발생시킨다. 생산성의 감소는 보통 25% 정도로 추정된다. 돼지는 초기에 파행, 발열, 의기소침, 식욕부진이 있다. 소 보다 발굽에서 더욱 증상이 심하다. 유두, 유선, 콧등에 수포가 형성된다. 혀의 병변은 소보다 심하지 않다. 잠복기가 2~14일 (소에서의 약 6.2일, 돼지에서는 약 10.2일)로 짧고, 전파가 매우 빠르며 경제적 피해가 크기 때문에 국제 교역에서도 규제대상이 되는 질병이다. 구제역의 병인체는 피코르나바이러스과 아프토바이러스속에 속하는 구제역 바이러스로 현재까지 7개의 혈청형(A, O, C, Asia 1, SAT 1, SAT 2 및 SAT 3)이 알려져 있다. 이 전염병은 동물전염병 중에서 가장 악명 높은 전염병이다. 세계동물보건기구 (OIE)에서도 각 국간에 국제적인 위협을 최소화하기 위하여 질병의 발생을 보고해야 하는 질병으로 특별 관리하고 있다. 2006년 이후 최근까지 아시아 지역에서 지속적으로 많은 발생을 보이고 있다. 금년 들어 중국, 대만, 일본, 몽골, 우리나라까지 발생되어 이 질병의 위험성에 대하여 다시 한번 생각하게 하였다. 구제역의 재발방지를 위하여 최근 동북아시아 지역의 발생상황과 향후 구제역의 발생억제 또는 발생시 긴급 대응을 위하여 해야 할 일은 무엇인지 알아보자.

• Journal of the Korean Ceramic Society
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• v.38 no.10
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• pp.936-941
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• 2001

The influence of the ${Al_2}{O_3}$ particle size on flaw tolerance of the $ZrO_2/{Al_2}{O_3}$ composites prepared by mixing 5.31 mol% ${Y_2}{O_3}$-4.45 mol% ${Nb_2}{O_5}$-90.31 mol% $ZrO_2$ and ${Al_2}{O_3}$ was investigated. The composites exhibited rising R-curve behavior and plateau fracture toughness of 7.9 and $8.8MPam^{1/2}$ for the additions of 20 vol% of 0.2 and $2.8{\mu}m$ ${Al_2}{O_3}$ particles, respectively. The difference in the fracture toughness resistance was attributed mainly to the grain size of tetragonal $ZrO_2$ phase in the composites, which scaled with the ${Al_2}{O_3}$ particle size.

• Applied Chemistry for Engineering
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• v.21 no.1
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• pp.111-114
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• 2010

In the attrition reactor for the American Society for Testing and Materials (ASTM) D5757-95, the attrition characteristics of catalysts for water gas shift reaction were investigated. The effects of attrition characteristics of low temperature shift catalysts (LTS) and high temperature shift catalysts (HTS) on fluidization phenomena and average particle size were investigated and compared with the attrition characteristics of sand particles. The particle size of catalysts was decreased and particle size distribution in attrition tube was changed due to the effect of gas injection. About 40~50 wt% samples of original catalyst particles were entrained and lost. The amount of fly ash of LTS catalyst was less than that of HTS. Also, the weight of entrained particles which had original particle size of $212{\sim}300{\mu}m$ was lower than any other cases.

• Korean Journal of Materials Research
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• v.2 no.6
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• pp.468-476
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• 1992

Stress rupture properties and fracture behavior of Ni microalloyed W were studied using direct load creep tester at 100$0^{\circ}C$, 110$0^{\circ}C$ and 120$0^{\circ}C$ in $H_2$. At the same grain size, 15${\mu}$m, the 100hr. stress rupture strength of W-0.4wt% Ni was 23% higher than that of W-0.2wt%Ni due to the grain growth during test. The minimum creep rate of W-0.2wt%Ni was decreased with an increase in initial grain size. By increasing the Ni content of Ni microalloyed W, rupture time was increased owing to the smaller number and size of cavity. All the specimens showed intergranular fracture by grain boundary sliding and nucleation, growth and coalescence of cavities at grain boundary.

• Journal of the Korean Recycled Construction Resources Institute
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• v.3 no.4
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• pp.342-347
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• 2015

This study is basic experiment which prevents indiscriminate reclamation and recycles the wasted tire in order to solve environmental pollution according to generation rate of the wasted tire from recently industrial development. By applying as the substitute material of the lightweight aggregate among the constructional materials in order to evaluate the lightness of the wasted tire chip and suggest the recycling plan of the wasted tire chip. The prior experiment did the replacement ratio of the wasted tire with 20%, 40%, 60%, 80%, 100%, etc. and made a study on the strength and density properties. Based on the prior experiment of wasted tire, the replacement ratio was fixed at 15, 20, 25%, particle size of wasted tire was fixed at 0.2, 0.8, 1~2, 3~5, 5~7(mm). As a result, it is supposed that the best replacement ratio and particle size are 15% and 1~2mm, respectively.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.8 no.4
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• pp.563-566
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• 1998

$BaTiO_3$ fine particles were prepared by hydrothermal process from titanium tetra-isoproproxide ($Ti(OiPr)_4$) and barium hexa-hydroxide ($Ba(OH)_2{cdot}8H_2O$) as raw materials. The fine particles were obtained at the temperature range of 160 to $185^{\circ}C$. The properties of $BaTiO_3$ particles were studied as a function of various parameters such as reaction temperature, reaction time and Ba/Ti ratio, etc. The average particle size of $BaTiO_3$ increased with increasing reaction temperature and time. After hydrothermal treatment at $170^{\circ}C$ for 8 h, the average particle size of $BaTiO_3$ was about 30 nm and the particle size distribution was narrow.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.11a
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• pp.162-162
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• 2008

세리아는 고체 산화물 연료전지(SOFC, solid oxide fuel cell)의 전해질 재료와CMP( chemical mechanical polishing) 슬러리 재료, 자동차의 3원 촉매, gas sensor, UV absorbent등 여러 분야에서 사용되고 있다. 본 연구에서는 세리아의 입자의 크기와 형상을 조절하여 성능 및 물성을 향상시켜 보다 넓은 분야의 활용을 하고자 실험을 실시하였다. 세리아 합성에 사용되는 전구체인 cerium carbonate의 특성이 세리아 분말의 물리화학적 특성에 직접적인 영향을 주기 때문에 전구체의 합성 단계에서 형상과 크기를 조절하고자 하였다. 세륨염으로 cerium nitrate hexahydrate, 균일침전반응을 할 수 있는 urea를 침전제로 사용하였다. 반응 용매의 유전상수를 조절하고 반응의 과포화도 변화를 이용하기 위하여 에탄올을 첨가하여 입자의 크기 및 형상을 조절, cubic형태의 $Ce_2O(CO_3)_2{\cdot}H_2O$ 결정상을 가지는 세리아 전구체를 합성하였다. 이렇게 생성된 전구체를 $1000^{\circ}C$에서 2시간동안 하소하여 세리아를 합성하고 반응시간, 농도, 에탄올의 함량 변화에 대해 XRD, FE-SEM, particle size analyzer, micropore physisorption analyzer 분석을 통하여 입자의 결정상과 형상, 입도 분포 및 기공분포 등을 반응인자의 변화에 따라 비교 및 해석하였다.