Orthokeratienized odontogenic cyst (OOC) is a comparatively unusual developmental odontogenic cyst arising from odontogenic epithelium. Recurrence has rarely been noted, and has been reported in less than 2% of cases. Epidermoid cyst (EDC) is a benign cystic lesion, which is lined by stratified squamous epithelium and includes keratin debris. They can present anywhere in the body but are rare in the head and neck areas. In this report, we present an uncommon case of simultaneous occurrence of OOC in mandible and EDC around the areas of both ears in a patient who has no history of genetic syndrome.

Dentigerous cyst is considered one of the representative cystic lesions, which accounts for approximately 15%-30% of the odontogenic cysts. Although its recurrence rate is low, a small proportion of dentigerous cysts converted into ameloblastomas, squamous cell carcinomas, and mucoepidermoid carcinomas. Here we present an uncommon case characterized by histopathological transformation from a dentigerous cyst to an ameloblastoma, and further investigate the factors contributing to its conversion.

Formaldehyde is important because of its irritant and toxic properties, mutagenicity and carcinogenicity, In this study, liquid chromatography/mass spectrometry (LC/MS) was used for the analysis of formaldehyde after derivatization with 2,4-dinitrophenylhydrazine (DNPH) cartridge. Analytical parameters such as linearity, repeatability and minimum detection limit were evaluated. The linearity (r²) was 0.9999 when analyte concentration ranges from 50 to 400 ㎍/L. The relative standard deviation (%RSD) was 0.83% for the concentration of 400 ㎍/L, and the minimum detection limit (MDL) was 0.27 ppbv. We investigated the distribution of formaldehyde concentrations based on a total of 96 samples(industrial area : 32, complex boundary line : 32, affected (residential) area : 32) measured at the Shi-Hwa industrial complex from April to October 2006. By the statistical analysis of these measurement data, the average level of formaldehyde from industrial area, complex boundary line, and affected area was 2.7, 2.1, and 2.2 ppb during the daytime (10:00~16:00), and 1.4, 1.1, and 1.6 ppb during the nighttime (19:30~23:00), respectively. And also, we investigated the emission concentrations of formaldehyde from various emission sources of 33 individual companies located in the Shi-Hwa industrial complex from September to November 2006. The results of our study showed that the emission concentrations of formaldehyde greatly varied according to industrial and source types. The emission concentrations of formaldehyde showed in the descending oder of 11.4 ppm for insulation cable process, 2.0 ppm for sand casting process, 1.7 ppm for synthesis rubber process, and 1.3 ppm for hexamine process.

본 연구에서는 현재 국내에서 사용되고 있는 이분해성 미생물 분해성 시험방법의 문제점을 제시하고 이를 해결하거나 보완할 수 있는 방법을 제안하고자, OECD지침서에 등재된 6가지 이분해성 시험방법 중 시험물질의 선정에 제한이 없는 MITI(I), manometric respirometry, closed bottle test에 대하여 8개 화학물질을 대상으로 비교시험 하였다. 현재 국내에서는 MITI(I)법을 사용하고 있는데 이 방법은 접종미생물의 준비과정

In this study, to improve prevention system against disasters for marine bridges, the related references of marine bridges were analysed. As a result, the guideline of prevention facilities against disasters for marine bridges was proposed. This study will be referred for establishing related standards.

This paper carried out a study on design for the deviation block of PSC box girder bridges with external tendons. As a result, the actual load distribution on deviation block must be considered for design because of a discordance with the design concept.

Through the analysis of load behavior for two load cases, the fixing equipment developed shows higher limit load than maximum load data sensed in site experiments, which proves that the suggested fixing equipment have higher safety.

Through the analysis of load behavior for two fixing equipments, the suggested fixing equipment shows higher limit load than an existing fixing equipment, which proves that the suggested fixing equipment have higher safety.

It has becoming issue of damage in finishing materials of the exterior and interior when have to the transportation and lifting. So the purpose of this study is analyze for correlation of load on connecting part of unit modular when transporting unit modular by vehicle

Based on the study of development of motor-driven electric tool, it was found that the use of the mechanism developed was effective to bolt unit modules. On the other hand, an additional study is required such as torque of the tool.

본 연구는 충남 도서지역의 민속식물을 파악하기 위하여 2011년 3월부터 10월까지 수행되었다. 4개 시 군 지역에 속하는 17개 도서지역에서 주민 50여명을 대상으로 작성된 조사야장 905매의 설문조사를 분석한 결과, 충남 도서지역에서 파악되고 수집된 민속식물은 84과 219속 246종 3아종 22변종 3품종의 총 274분류군이었다. 조사야장에 따른 274분류군에 대한 용도별 이용현황은 식용 169분류군, 약용 134분류군, 관상용 67분류군, 향신료 17분류군, 향료 7분류군, 연료 7분류군, 유지 6분류군, 염료 5분류군, 밀원 4분류군, 섬유 3분류군, 수지 1분류군, 기타 26분류군으로, 식용으로의 이용 빈도가 가장 높았다. 연령별 표준식물명과 지방명의 일치도는 50대가 가장 높았으며, 60대가 가장 낮았다.