• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2003.11a
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• pp.1371-1372
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• 2003

직물에서 구조적 요인이 쾌적성과 연관된 유체전달 특성들에 미치는 영향을 연구하였다. 고려된 구조변수는 직물을 구성하는 실의 구성성분 그리고 꼬임수이다. 측정한 쾌적성과 연관된 물성으로 수분 흡수성, 수분 증발성, 그리고 수분 투과성이다. 이들 물성은 고려된 구조 인자들에 의해 큰 영향을 받았다. 결과들에 대한 객관적 분석과 이해를 위해 실에서 접촉적각, 직물에서 모세관 흡수 곡선, 그리고 기공크기를 측정하였으며, 또한 기존 이론들을 수정한 모델을 도입하여 모사 설명하였다.

• Proceedings of the KAIS Fall Conference
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• 2007.05a
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• pp.126-128
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• 2007

본 논문은 산업현장에서 발생하는 대표적인 폐유리를 기본 소재로 카본의 입도에 분포에 따른 발포 기공의 변화와 그에 따른 강도의 변화를 측정하고자 한다. 산업체에서 발생하는 폐유리는 그 양이 점차 늘어나고 있으며， 매립으로 인한 토양 오염 또한 심각한 상태이며 이에 활용도로 발포와 재용융의 다양한 방법으로 재활용이 이루어지고 있으며， 본 실험은 발포를 통한 여과제 또는 경량 골재， 수질 정화용 필터로 사용을 하고 있는 발포의 기본 특성 중에 카본 발포제의 입도의 영향에 대하여 좀 더 확인해 보기 위해 실험을 진행 하였다.

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.521-522
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• 2009

This study is concerned with elevating the penetration depth after carbonation and porosity change of concrete structures by applying alkali silicate hydrophilic impregnants including lithium and potassium silicates.

• Proceedings of the Membrane Society of Korea Conference
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• 1991.04a
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• pp.40-42
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• 1991

최근에 분리 농축 그리고 정제 등의 분야에서 세라믹 분리막은 내열성, 내약품성 및 우수한 기계적 강도와 같은 특성으로 인해 기존의 유기고분자막으로는 사용할수 없던 영역까지 그 응용 범위를 확대시키고 있다. 이러한 세라믹 분리막 중 기공크기가 0.1-0.001 $\mu$m 정도로 미세한 한외여과막의 경우, 최근에는 주로 졸-겔법을 이용하여 제조되는 것으로 보고되고 있는데, 이는 졸-겔법이 기존 분리 공정과 비교하여 볼대 다음과 같은 장점이 있기 때문이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.303-306
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• 2004

전기영동법을 이용한 초전도 후막의 제작공정은 그 특성상 외부의 물리적 방법으로 입자의 밀도를 향상시킬 수 없는 특징을 가지고 있으며 전착과정에서 수소가스가 발생됨으로 미세기공의 발생원인이되고다. 또한 건조 열처리과정에서 미세크랙의 발생이 되기도 한다. 따라서 공정과정에서 특성저하요인을 근본적으로 차단하고 밀도를 향상시킬 수 있는 공정에 대하여 연구하였으며 전착조건과 첨가제인 폴리머의 상관관계에 의한 최적화 방법에 대하여 연구하였다.

• Proceedings of the Korean Nuclear Society Conference
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• 1997.05b
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• pp.384-389
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• 1997

고분자 촉매 담체인 스티렌-디비닐벤젠의 제조시 중합반응 개시제의 함량에 따른 영향과 반응기의 재질에 따른 영향을 수소흡착실험을 통하여 확인하였다. 담체의 중합반응시 제조조건이 동일하다 할지라도 개시제의 함량에 따라서 담체의 기공 특성이 달라지므로 개시제의 함량은 모노머 양의 1%를 사용한 시료가 수소흡착능이 가장 좋은 것으로 나타났다. 반응기의 재질은 teflon으로 직접 제조한 것보다는 teflon으로 코팅 처리한 것이 더 수소흡착능이 좋은 것으로 확인되었다.

• Journal of the Korean Ceramic Society
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• v.42 no.3 s.274
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• pp.193-197
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• 2005

Wall and floor tiles were fabricated by a dry pressing method using waste glass and clay. The physical properties of the tiles such as absorption, bulk density, porosity, compressive strength, and abrasion loss are investigated with the firing temperature and glass contents. The physical properties are improved with increasing the firing temperature and glass contents. The composition containing the glass of $70 wt%$ and fired at $1050^{\circ}C$ for 2 h has the good properties. The optimal properties obtained in the tiles are the water absorprion of about $0.9\%$, the bulk density of about $2.3\;g/cm^3$, the apparent porosity of about $2.1 \%$, the compressive strength of about 210 MPa, and the abrasion loss of about 0.022 g, when the composition containing the glass of $70\;wt\%$ is fired at $1050^{\circ}C$. The physical proper1ies of tiles fabricated were enhanced compared to the commercial clay tiles, due to easy melting and densification of glassy phase during the firing process.

• Economic and Environmental Geology
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• v.55 no.6
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• pp.571-582
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• 2022

In this study, the raw material and tempers of bricks used in three brick tombs built in Gongju, during the Ungjin period of Baekje were investigated. The royal tomb of King Muryeong, the 6th tomb in the royal tombs, and Kyochonri brick tomb remained in Gongju and the bricks of each site had different shape and physical properties despite their similarity in raw materials. As the results of the mineralogical and microstructural analysis, the bricks of the royal tombs were made of refined raw materials, and were infrequently added crushed bricks(grogs) as a tempering material. On the other hand, thick and elongated pores of bricks from the Kyochonri brick tomb were frequently found, and the remains of plant carbonization are observed in their microstructures. Since the pores are mainly distributed in a thickness of 0.3 to 1 mm, it is estimated that bricks were produced by adding a certain size of the plant to refined soil, and grogs also were added as a tempering material. In particular, it was found that adding plants and grogs in raw materials of bricks caused thick pores or cracks in the internal structure. Since the bricks of the Kyochonri brick tomb have internal cracks and low firing temperature, the ultrasonic velocity of the bricks was lower than that of the royal tomb bricks. It means that the mechanical strength of these bricks were relatively low. Accordingly, it is estimated that the tempering materials, firing temperature, and internal structures of bricks can affect durability of the brick, and it can be thought as a difference in the manufacturing technology of brick making.

• Journal of Adhesion and Interface
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• v.21 no.2
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• pp.51-57
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• 2020

Recently, there has been growing interest in the study of removal of harmful and hazardous pollutants emitted by industrial activities. In this study, we have developed porous activated carbon fibers prepared by a water vapor activation method and analyzed the adsorptions of the harmful gases with electrochemical responses of activated carbon fibers. To control the uniformity of pore structures, active reaction areas, and active sites, the reaction conditions of activation temperatures were varied from 750 to 850 ℃ with the predetermined reaction time intervals (30 to 240 min). The SO₂ and NO gas adsorptions of activated carbon fibers prepared by various reaction conditions were analyzed and monitored by electrochemical sensor responses. In particular, the activated carbon fibers prepared at the reaction temperature of 850 ℃ and time of 45 min showed the highest specific surface area (1,041.9 ㎡/g) and pore characteristics (0.42 ㎤/g), and excellent adsorption capabilities of SO₂ (1.061 mg/g) and NO (1.210 mg/g) gases, respectively.

• Journal of the Korean Ceramic Society
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• v.34 no.1
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• pp.45-55
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• 1997

Various kinds of amorphous silicates were used as raw materials to synthesize building materials based on calcium silicate hydrates. Relationships between the reactivities of silicates and castabilities of the building materials were investigated. In addition, effects of the reactivities of silicates on the mechanical properties of casted specimens were studied by analyzing microstructures and hydrates produced. As the reactivity of silicate increase, the press castability increases and the crystal size of hydrate and pore size also increase. For the mechanical properties, the flexural strength increases with decreasing crystal size and densifing microstructure. The compressive strength is greatly dependent on the den-sification of microstructure rather than crystal size of hydrate. Based on the results, diatomous ma-terials are desirable due to high reactivity and formation of densified microstructure. Slag and fly ash may be partially used as raw materials with amorphous silicates to manufacture building materials based on calcium silicate hydrates.