The modern society is changed into mass production, complicated circulation society and mass consuming society because of the development of the fast science technology since the occurrence of the industrial revolution. Also, the human life style is changed into the abundant consumption society because of the appearance of the various products. The society change like the above provide comfortable life to us. but We are facing with danger for the bad food, illegal medicines and bad products. So, To solve the danger like the above, The Product Reliability Law be made. The both The enterprise and consumer need The Product Reliability Law to protect one's own interest. The consumer is claiming to use the product of safety of the resonable price and good quality in modern society, So, 1 studied on countermeasures of domestic enterprise to increase the competitive power of the enterprise according to Product Reliability Law

김치에서 분리된 Leuconostoc citreum IH22를 순무에 접종한 동치미와 순무동치미의 저장 중의 변화는 다음과 같다. 1. 두 시료의 pH 변화는 저장 시간의 증가에 따라 감소하는 경향을 보였으나 젖산균 접종 동치미의 pH의 감소는 control에 비해 감소의 속도가 빠른 경향을 나타냈다. 2. 총산도의 변화는 저장 시간에 따라 증가하는 경향은 두 시료 같았으나 젖산균 접종 동치미는 저장 21일 째 부터는 변하지 않았다. 3. 총균수는 두 시료 모두 21일에 최대 균수를 보인 후 감소하는 경향이었다. 4. 젖산균수는 두 시료 14일에 가장 높다가 21일 부터는 급격히 감소하는 경향을 보였다. 5. 물성도의 변화에서도 control은 경도와 파쇄성에서 저장 14일 정도에 감소하다가 다시 증가하였고, 젖산균 접종 동치미는 저장 기간과 함께 완만하게 감소하였다. 6. 관능검사 결과 순무 동치미와 젖산균 동치미는 저장 기간 동안 신만, 시원한 맛의 변화가 없는 것으로 다했고, 탄산미와 기호도는 순무 동치미가 저장 14일 때가 젖산균 접종 동치미보다 높은 것으로 나타났으며 관능 특성에서 접종한 것과 control과 차이가 있는 항목은 탄산미와 기호도가 1% 수준의 유의차를 나타냈다.

In this case study, results of the explosion accident at MEK-PO factory were analysed by using the consequence analysis of quantitative hazard assessment and the explosion energy, the burst pressure of vessel, and overpressures at the explosion center and at 300m distance from the explosion center were estimated, respectively. As a result, we found that a cause of accident was the runaway reaction of product(MEK-PO) because of the molecular expansion in vessel and that the possibility of the runaway reaction was classified the mechanical failure(the obstacle of refrigerator or the shutdown valve), design error, and operating error by lack of thermochemical knowledge. Also, the evasive action to prevent accident was suggested.

SPS(Spark Plasma Sintering ) is known to be an excellent sintering method for porous materials. In the present work an attempt has been made of fabricating porous 316L Stainless steel with good mechanical properties by using controlled SPS process Porosity was 21%~53% at sintering temperature of ~100 The limit of porosity with available mechanical strength was 30% at given experimental conditions. Porosity can be controlled by manipulating the intial height of the compact by means of the supporter and punch length. The applied pressure can be exerted entirely upon the supporter, giving no influence on the specimen. The specimen is then able to be sintered pressurelessly. In this case porosity could be controlled from 38 to 45% with good mechanical strength at sintering temperature of 90. As the holding time increased, neck between the particles grew progressively, but shrinkage of the specimen did not occur, implying that the porosity remained constant during the whole sintering process.

The 6061 Al alloy based composites reinforced with 10 vol% SiC whiskers were prepared by powder metallurgy with the powders having the different sizes, i.e. < and> The composites were subjected to equal channel angular pressing (ECAP) at various conditions and the microstructural changes during ECAP were examined In the composites SiC whiskers were clustered and randomly aligned. The clusters were relatively well distributed in the composite with the smaller initial powder size. After ECAP, the clusters were aligned parallel to flow direction and became smaller. In addition, the shape of clusters was changed from irregular to round. The microstructure of the ECAPed samples were compared with those of the conventionally hot-extruded composites. The uniform microstructure and enhanced microhardness could be obtained by using the powders having the smaller size, decreasing ECAP temperature and repeating ECAP.