• Journal of the Mineralogical Society of Korea
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• v.18 no.1
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• pp.11-17
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• 2005

Na-A zeolite were synthesized from melting slag of the incinerated ash by the alkaline activation processes. The experiments were performed in stainless steel vessels, with continuous stirring during the reaction periods. The silica-rich solution, a starting material, which was the waste of crystal growth factory, contains 5.7 wt% SiO₂ and 3.2 wt% Na₂O. And NaAlO₂ was made by the reaction of aluminium dross and NaOH solution and its molar ratios were Na₂O/Al₂O₃= 1.2 and H₂O/Na₂O=9. During the residence time of 7∼8 h at 80℃, the mixing of the silica-rich solution, NaAlO₂ and melting slag yields the production of homogeneous Na-A zeolite. The optimal reactant composition in molar ratio of Na₂O:Al₂O₃:SiO₂ was 1.3∼l.4 : 0.8∼0.9 : 2 and mixing ratio of solution and slag was 1/7∼10 (g/cc). Synthesized Na-A zeolite has cubic form uniformly and its size ranges about 1 ㎛. Ca/sup 2+/ ion exchange capacity of the Na-A was about 180∼210 meq/100g, corresponding approximately 80% to the commercial detergent builder.

• Asian Pacific Journal of Cancer Prevention
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• v.16 no.17
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• pp.8003-8008
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• 2015

Background: The aim of this study was to investigate whether family history of cancer is associated with head and neck cancer risk in a Chinese population. Materials and Methods: This case-control study included 921 cases and 806 controls. Recruitment was from December 2010 to January 2015 in eight centers in East Asia. Controls were matched to cases with reference to sex, 5-year age group, ethnicity, and residence area at each of the centers. Results: We observed an increased risk of head and neck cancer due to first degree family history of head and neck cancer, but after adjustment for tobacco smoking, alcohol drinking and betel quid chewing the association was no longer apparent. The adjusted OR were 1.10 (95% CI=0.80-1.50) for family history of tobacco-related cancer and 0.96 (95%CI=0.75-1.24) for family history of any cancer with adjustment for tobacco, betel quid and alcohol habits. The ORs for having a first-degree relative with HNC were higher in all tobacco/alcohol subgroups. Conclusions: We did not observe a strong association between family history of head and neck cancer and head and neck cancer risk after taking into account lifestyle factors. Our study suggests that an increased risk due to family history of head and neck cancer may be due to shared risk factors. Further studies may be needed to assess the lifestyle factors of the relatives.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.34 no.1
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• pp.18-39
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• 2016

The study pertains to reviewing and discussing of the master plan of the main buildings in the palaces of Joseon Dynasty regarding on a Feng Shui concept that has been implemented on the palace axis that is originated from the main mountain. Gyeongbokgung (景福宮) Palace is located on the northwest coner of Hanyang (漢陽) and on the tip of the main mountain which is in contrast a quite distinguishable from the location of the Fobidden city in Beijing located in the middle of a vast basin. Changdeokgung (昌德宮) Palace as well is also located on the tip of Eungbong (鷹峯), a part of Samkaksan (三角山) mountain, of which the locations were designed for the palaces to receive the benevolent force from the main mountain. The same concept was also applied to appointing the ideal location of the maJor buildings such as Jungjeon (正殿: The throne hall), Pyunjeon (便殿: The king's office) and Chimjeon (寢殿: The king and queen's residence) in the palace that must receive the benevolent force from the qui stream also originated from the main mountain, as such that the buildings have in close relationship with the king. Amisa (蛾眉砂) had been considered as an important geographical milestone of the estate where the palace is located, especially as the guiding landmark for other buildings that must be on the land axis. The land axis with the Amisa as the starting point attributed the Feng Shui as an important measure that determines the location and the shape of other buildings. The buildings location was appeared as having the conceptual buildings location as 'front office-back bedroom building (前朝後寢)' and 'three gates-three sectors (三問三朝)' as per the Rites of Zhou (周禮). On both palaces, Amisa is located on the benevolent point of the land, and the king's bed room buildings are located near the Amisa. The main offices were located on the south of the king's bed room buildings. By practicing this type of concept, consequently the king can receive the pure benevolent force first. In the case of the clearly distinguished locations of the buildings in Gyeongbokgung Palace, Chimjeon, Pyunjeon and Jungjeon were located on the same main qui stream. However, in Changdeokgung Palace where scattered qui stream is observed, the buildings are located on the scattered qui stream. The study found that the type of location of Jungjeon receives least amount of benefit from the Feng Shui but reflects primarily the king's authority rather than order and formality of the space.