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The Application of the Forensic Dental Identification to Unidentified Individual Remains in Korea
박희경,Park, Hee-Kyung Korean Academy of Orofacial Pain and Oral Medicine 2006 Journal of Oral Medicine and Pain Vol.31 No.1
The cases of unidentified individual remains submitted to Forensic dentistry section in National Institute of Scientific Investigation, Korea were analyzed to study the application of forensic dental identification into individual identification in the period 2002-2005. The identification cases of unidentified remains were 405 out of 493, which accounted about 82% of whole cases. The incidence of submission of skeletons at least including the skull was increased from 58% in 2002 to 80% in 2005. The numbers of cases for the full examinations were 4 times more than that for age estimation in 2005. Twenty-four cases were submitted for skull to photographic superimposition and 15 out of 24 cases were examined, and the other 9 cases were examined by DNA analysis only. The submitted cases for dental comparison were 23 cases, 9 cases were positively identified, 4 cases were possible, 7 cases were excluded, and 3 cases ended up with insufficient evidences. The proportion of positive identification by dental methods was increased gradually from 9% in 2002 to 46% in 2005. Forensic dental identification has become important and useful because the availability of dental records and radiographs has been increasing. Compared to DNA analysis, forensic dental identification has several advantages such as no needs for high cost equipments and low expenses. And the interpretation of results is straightforward and speedy. These advantages are based on using primary their own dental records of the individuals rather than secondary DNA reference samples from family members. The application of the forensic dental identification to unidentified individual remains will be increased because the dental comparison can complement the limitation of DNA analysis and skull to photographic superimposition in many cases. In order to obtain positive identifications of unidentified remains, a close collaboration between the police and forensic scientists is important. The systemic approach including legislation to preserve dental records of unidentified remains and missing persons for the identification of unidentified remains should be needed.
Expression of Clusterin in the Salivary Gland under Restraint Stress
박희경,전양현,홍정표,어규식,Park, Hee-Kyung,Chun, Yang-Hyun,Hong, Jung-Pyo,Auh, Q-Schick Korean Academy of Orofacial Pain and Oral Medicine 2008 Journal of Oral Medicine and Pain Vol.33 No.3
The belief that stress leads to illness has a long history. A number of the orofacial disease are also closely associated with stress. Despite research in the relationship of stress and the orofacial diseases leading to statistically significant correlations, the pathology remains vague. In the present study, the expression of clusterin, a stress protein responsible for antiapoptosis and cytoprotection, under restraint stress condition was observed in the submandibular gland, one of the major salivary glands. Sprague-Dawley rats were divided into 2 groups: normal group and restraint stress group. The rats of restraint stress group were placed in the stress cages and then sacrificed at day 0, 3 and 5 day of the experiment. After that, the submandibular glands of all the rats were excised immediately. The levels of clusterin proteins and mRNA in the tissues were measured by immunohistochemistry and Northern blot analyses, respectively. The results were as follows: 1. In the immunohistochemistry, clusterin protein was detected only immediately after the application of restraint stress. 2. In the restraint stress group, at day 3 and 5, histologically apoptosis was induced with karyorrhectic and pyknotic changes. 3. By the restraint stress, acinic cells were destructed earlier than ductal cells. 4. In the Northern blot, mRNA of clusterin was expressed only immediately after the application of restraint stress. The overall results suggest that as an early response to stress, clusterin is expressed in the glands to protect the glandular cells from the stress. But if stress is so strong and prolonged that it can exceed the stress adaptability of the cells, then the cells may undergo apoptosis instead of producing clusterin. An Epidemiologic Study of Symptoms of Temporomandibular Disorders in Korean College Students.
유량의 변화에 따른 탈산소계수 및 재폭기계수가 임계용존산소량에 주는 영향
박희경,남궁완 ( Hee Kyung Park,Wan Namkoong ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.4
Wasteload allocations(WLA) and total maximum daliy load(TMDL) determined with the lowest streaflow(e.g., 7Q10) may violate water quality standards as streamflow increases. Traditionally, streamflow increase is considered to monotonically improve the worst water quality (e.g., dissolved oxygen) which occurs at the lowest streamflow. This conventional worst case assumption might not be held because of parameter changes with streamflow increase which include increased non-point source discharges, varying decay (k₁ and reaeration (k₂ coefficients and reduced residence times. These parameter changes were hypothetically tested here to see the possible violation of the assumption. The results of this study indicate that unless the dependence of decay coefficient on streamflow is high and positive($gt;0.11), the worst case assumption will be valid in most natural channels. However, in highly regulated and polluted streams, the possibility of the violation was also observed. Since some of our major streams are well regulated for many purposes and sometimes observed highly polluted, the study results suggest that use of the lowest streamflow might be inappropriate for wasteload allocations. Rather, a trial and error approach is suggested. The approach develops wasteload allocation plans; tests them for a number of low streamflow conditions; and finds a best one. For this, computer models will be iteratively used.