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A study was carried out on the relationship between 431 incidences of carbon monoxide poisoning from January 1, 1966 to March 31, 1969 in Seoul and meteorological factors such as atmospheric temperature, atmospheric pressure, wind velocity, cloud, humidity and precipitation. The results obtained are as follows: 1) The causes of incidences of carbon monoxide poisoning show 51.6 per cent of ondol floor leakage, 35.9 per cent through the door and 6.7 per cent of the stove in the room. 2) December is the highest incidence-occurred month of carbon monxide poisoning with 84(24.7%) out of 339 and 280 (82.7%) occur from September to January. 3) More incidences occur during the period with higher atmospheric temperature, higher humidity, more cloudy sky and lower wind velocity than the weekly average values. 4) No significant differences is found between the higher and lower atmospheric pressure. 5) The rate of incidences is higher during the period with precipitation then without precipitation.
This article is about the Koguryo(高句麗) Fortresses which are located northern boundary on Kyunggi province.(京畿道) Those Fortresses that are small, respectively less than 400 meters round can be divided into the three districts. These districts are the Ahcha mountain, the Yangju basin and the northern boundary of the Imjin river. Until now, many scholars thought that Those Fortresses were made by Koguryo in the same period. However, in case of the Fortresses in the Yangju basin were used by Bakje(百濟) and Shila(新羅) as well. To confirm when the Fortresses were made and were used by whom, this article researches many historical records and archeological materials. This historical and archeological study help to reveal that the Fortresses which are located in the Ahcha mountain district were made in the middle of 6th century, in the Yangju basin district were made between in the middle of 6th century and the early 7th century and in the northern boundary of Imjin river were made from 475 year to 668 year. The Fortresses in the Ahcha mountain district usually used for military purpose. Because the Ahcha mountain fortresses shows dense pack deployment. The Fortresses in the northern boundary of Imjin river are scattered along the river. These Fortresses used for communication. The Fortresses in the Yangju basin is believed that Shila made for defense against attack from the Koguryo. After the front line came down, Shila made huge Fortresses at strategic point like the Ahcha mountain Fortress, the Yangju mountain Fortress, the Banwal mountain Fortress and the Chiljung Fortress. During, and after building huge fortresses, Shila military didn't use the small fortresses. Finally, the small fortresses had abolished on the contrary Shila's administrative control increased to.