A study on the solid-liquid 2 phase helical flow in an inclined annulus

한상목,김영주,우남섭,황영규 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.10

An investigation is conducted to understand hydraulic transport characteristics of a solid-liquid mixture flowing vertically upward. Namely, this is the instance that solid particles are carried by non-Newtonian fluids in a slim hole concentric annulus with rotating inner cylinder. In this study a clear acrylic pipe was used in order to observe the movement of solid particles. The bulk axial velocities varied from 0.4 m/s to 1.2 m/s. The mud systems which were utilized included aqueous solution of sodium carboxymethyl cellulose (0.2~0.4%CMC) and 5% bentonite solutions. Solid volumetric concentration and pressure drops were measured for the various parameters such as inclined annulus, flow rate, and rotational speed of inner cylinder. For both CMC and bentonite solutions, the higher the concentration of the solid particles are, the larger the pressure drops become.

A study for estimate of contamination source with numerical simulation method in the turbulent type cleanroom

한상목,황영규,김동권 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.11

Contamination in a cleanroom may appear even more complicated by the effect of complicated manufacturing processes and indoorequipment. For this reason, detailed information about the concentration of pollutant particles in the cleanroom is needed to control thelevel of contamination financially and efficiently without any problem in manufacturing process. Allocation method has been developedas one of main ideas to fulfill a function of controlling contamination under the situation. By using this method, weighting factor can bepredicted based on cleanliness on sampling spots and the values based on numerical analysis. In this point, the weighting factor indicateshow each of contaminant sources influences the concentration of pollutant in the cleanroom. In this paper, when applied allocation method,we propose zoning method to accelerate the calculation time. And it was applied to cleanliness the actual improvement of the turbulenttype clean room. As a result, we could estimate quantitatively the amount of contamination generated from the pollution sources. And was proved by experiments that it is possible to improve the level of cleanliness of the cleanrooms by using these results.

하수슬러지 소각재를 이용한 투수블록 제조

한상목,신대용,최돈량 강원대학교 부설 석재복합신소재 제품연구센터 2003 석재연 논문집 Vol.8 No.-

다공질 세라믹스 투수블록의 투수계수와 물리ㆍ기계적 특성에 미치는 하수슬러지 소각재 첨가량과 폐도자기 파편의 입경 효과에 대하여 조사하였다. 시편의 물리ㆍ기계적 특성은 폐도자기 파편의 입경과 관계없이 소각재 첨가량과 소성온도가 증가함에 따라 증가하였으며, 소각재 첨가량이 동등한 시편은 소성온도가 증가하고 폐도자기 파편의 입경이 감소함에 따라 증가하였다. 1~2mm의 폐도자기 파편과 하수슬러지 소각재의 함량이 30wt%인 성형시편(30A60F)을 1000℃에서 2시간 소성한 시편은 부피비중 2.12~2.21, 기공률 37.6~49.6%, 압축강도 106~161 kgf/cm² 및 투수계수 0.098~0.132 cm/s으로 투수블록으로의 사용이 가능하였다. 소각재의 첨가량에 따른 시편의 중금속용출은 매립지 허용기준치보다 낮아 주위 환경에 무해하였다. The effects of sewage sludge ash content and waste porcelain fragment size on the coefficients of permeability was investigated and the physicalㆍmechanical properties of porous ceramics for water-permeable paving brick was studied. The physicalㆍmechanical properties of specimens have depended on sintering temperature and sewage sludge ash content without particle size effect of waste porcelain fragment. As sintering temperature increase and waste porcelain fragment size decrease at the same sewage sludge ash content physicalㆍmechanical properties of them have been improved. The bulk density, porosity, coefficients of permeability and compressive strength of specimens with the batch composition of 30 wt.% of sewage sludge content(30A60F) and waste porcelain fragment size with 1~2mm, and sintered at 1000℃ for 2 hours were 2.12~2.21, 37.6~49.6%, 0.098~0.132 cm/s and 106~161 kgf/cm², respectively. The specimens can be used with a water-permeable paving brick with high coefficients of permeability and adequate strength. The heavy metals included in the sewage sludge ash showed lower than the standard level.

침전법에 의한 CaCO₃:Sn^(2+) 형광체의 합성

한상목,신대용,윤봉구 강원대학교 부설 석재복합신소재 제품연구센터 2004 석재연 논문집 Vol.9 No.-

침전법을 이용하여 CaCO₃를 합성한 후, 활성제로서 Sn^(2+)를 도핑하여 CaCO₃:Sn^(2+) 형광체를 합성하고 결정상과 형상 및 Sn^(2+) 첨가량에 따른 형광특성을 조사하였다. CaCl₂·2H₂O-(NH₄)₂CO₃수용액에 NH₄OH를 첨가하여 pH가 증가하면 입자의 응집이 관찰되지 않고 vaterite상이 장시간 안정하게 존재하였으며 pH 11에서는 1~3㎛의 순수한 구형 vaterite상이 얻어졌다. Vaterite인 구형 CaCO₃:Sn^(2+) 형광체와 열처리한 구형의 calcite형 CaCO₃:Sn^(2+) 형광체는 230 nm에서 최대로 여기되어 465 nm에서 최대 발광강도를 나타내었다. 합성된 CaCO₃:Sn^(2+) 형광체는 결정상과 관계없이 SnCl₂·2H₂O의 첨가량이 2 mol%일 때 가장 강한 발광강도를 나타내었으며, 능면체의 calcite형 CaCO₃:Sn^(2+)형광체는 열처리하여 안정화된 구형의 calcite CaCO₃:Sn^(2+) 형광체와 구형의 vaterite형 CaCO₃:Sn^(2+) 형광체에 비해 높은 발광강도를 나타내었다. Vaterite type of CaCO₃ was synthesized by using the precipitation method(CaCl₂-(NH₄)₂CO₃ system) with addition of NH₄OH at different temperature, time, pH and concentration. As a result, pure vaterite having spherical shape(0.1~10 ㎛ in size) was formed at the condition of high pH(>11) and high concentration(>5 M). CaCO₃:Sn^(2+) phosphors(spherical vaterite) were synthesized at CaCl₂-SnCl₂-(NH₄)₂CO₃-NH₄OH system. CaCO₃:Sn^(2+) phosphors(spherical vaterite) were transformed to CaCO₃:Sn^(2+) phosphors(spherical calcite) by heating at 550℃ for 10 min. The Particle sizes of CaCO₃:Sn^(2+) phosphors(rhombohedral calcite) and CaCO₃:Sn^(2+) phosphors (spherical vaterite) were 10~15 ㎛ and 1~3 ㎛ respectively. The excitation spectrum of CaCO₃:Sn^(2+) phosphors(spherical vaterite and spherical calcite) exhibited a maximum peak intensity at 230 nm with a narrow absorption band from 220 nm to 240 nm. At the excitation spectrum of 275nm, the emission spectrum of CaCO₃:Sn^(2+) phosphor (rhombohedral calcite) with SnCl₂of 2 mol% exhibited a maximum peak intensity at 465 nm of bright blue fluorescence. Also, the emission spectrum of CaCO₃:Sn^(2+) phosphors(spherical vaterite, spherical calcite) exhibited a maximum peak intensity at 465 nm but exhibited weak peak intensity than CaCO₃:Sn^(2+) phosphors(rhombohedral calcite).

초보자를 위한 해설 -유리와 유약

한상목 이화여자대학교 도예연구소 1981 陶藝硏究 Vol.- No.3

소결체 미구조의 현미경적 고찰 : 카오린-도석 계 Kaolin-Pottery stone system

한상목 江原大學校 産業技術硏究所 1985 産業技術硏究 Vol.5 No.-

The microstructure of sintered body of two component(kaolin-pottery stone) system after firing was examined with scanning electron microscope. At first the pottery stone ws melted into glassy phase and the kaoline was decomposed to mullite and silica at higher temperature. The interlocked mullite crystals and silica surrounded by glassy phase are belived to increase strength.

지진가속도 계측 및 지진관측소 구축 타당성 연구

한상목,우남섭,하지호,김태우,이왕도,김기석,양재열,김영주 한국산업융합학회 2020 한국산업융합학회 논문집 Vol.23 No.3

Therefore, it was agreed that an earthquake monitoring station should be set up within the site of Handong University by analyzing drilling data and Disaster such as earthquakes is urgently needed to prepare for earthquakes in that people’s lives and national development depend on the nation’s ability to manage disasters. Many experts say that the Korean Peninsula is also under the influence of earthquakes and is not a safe zone for earthquakes. A seismological observatory will be established in Pohang to monitor ground sensors and study seismic characteristics through the task of “Development of Smart Sensor-based Intelligent Information Platform in Earthquake Region.” Therefore, it was agreed to set up a seismological observatory within the site of Handong University by analyzing drilling data and conducting on-site surveys in northern Pohang, which were heavily damaged by liquefaction and earthquakes. In this study, it was decided to make a comprehensive judgment by considering the geological characteristics of the site, whether it can perform functions, and the convenience of construction and maintenance for the final site of the seismological observatory discussed with Handong University. After completing a feasibility review on selecting a site for Handong University, we will establish a seismological observatory and actively utilize it for seismic research using data from alarm issuance and seismic data in the event of a future earthquake.

Electro-osmosis에 의한 Dehydration

한상목 강원대학교 산업기술연구소 1984 産業技術硏究 Vol.4 No.-

In process of water removing safely from plastic clay, an electric field applied to a wet, porous solid such as clay usually causes the rapid dehydaration. The water-bearing positive ions move to negative electrode under the d.c. electrical stress or field. Therefore application of electro-osmosis to wet clay could include drying thick and large-scale ceramic body quickly and evenly. The d.c. power supply unit to 60 volts is necessary for safe practice. Also wider contact area and shorter distance between electrodes accelerate effectively the removal of water.

A Study on the Mud Flow Characteristics in Directional Drilling System

한상목,우남섭,김영주 한국에너지학회 2018 한국에너지공학회 학술발표회 Vol.2018 No.04

Zro₂-Ni 複合體에 關한 硏究

韓相穆 江原大學校 1980 硏究論文集 Vol.14 No.2