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유비쿼터스 건설(Ubiquitous Construction)환경에서의 무선통신기술적용을 위한 USN의 간섭영향 분석
이동은(Lee, Dong-Eun),장원식(Jang, Won-Sik),장원석(Jang, Won-Suk) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.3
Advents of ubiquitous computing technologies and Ubiquitous Construction (UC) have gained the construction engineers’ attention on ZigBee technology. In UC environment, various wireless technologies exist in the area of physical measurement, assets monitoring, system controlling and security monitoring. However, it is possible to observe the frequency interference of wireless technologies at the similar bandwidth, resulting in signal degradation and communication loss. This paper analyzed the negative effect from the frequency interference of ZigBee with WiFi, Bluetooth, and Microwave Oven all of which are operated at 2.4GHz frequency. The experimental results indicate that simultaneous use of ZigBee with other wireless technologies at the same frequency range decreases signal strength, link quality, and packet reception rate if they are separated less than 1 meter. For microwave oven, however, serious loss of RF packets in ZigBee is observed even at the separation distance of 20 meters. Thus, it is important to carefully operate device’s channel setting and separation distance to minimize the negative effect of frequency interference.
Jee Soo Park(박지수),Won Sik Jang(장원식),Sung Joon Hong(홍성준),Young Deuk Choi(최영득),Koon Ho Rha(나군호),Won Sik Ham(함원식) 대한비뇨기종양학회 2020 대한비뇨기종양학회지 Vol.18 No.1
Purpose: To report an association between prostate cancer and vitamin D levels among different races in a single population in the United States. Materials and Methods: We investigated whether there was an association between vitamin D level and prostate cancer in different races in the United States. We used data collected from 1,363 men during the National Health and Nutrition Examination Survey 2007–2008. Multivariate logistic regression analysis was used to evaluate the independent associations between vitamin D levels (not only 25-hydroxyvitamin D [25(OH)D], but also 25(OH)D2 and D3) and prostate cancer. Association between vitamin D levels and prostate specific antigen level was also analyzed in non-Hispanic white males without prostate cancer. Results: Older age was significantly associated with prostate cancer in all races (p<0.05), whereas vitamin D (p=0.024), especially 25(OH)D2 (p=0.027) was significantly higher only in non-Hispanic white males. There was no difference in vitamin D levels between non-Hispanic white males with a prostate specific antigen concentration >3 ng/mL and ≤3 ng/mL. Conclusions: This study revealed a positive association between vitamin D, especially 25(OH)D2, and prostate cancer only in non-Hispanic white males. And vitamin D was not associated with prostate specific antigen level causing detection bias.
Plummer-Vinson 증후군의 내시경적 풍선확장술 치험 1예
최진우,정성욱,문정섭,유권,전영빈,장원식,정원종 대한소화기내시경학회 1998 Clinical Endoscopy Vol.18 No.1
Plummer-Vinson syndrome is characterized by dysphagia associated with anemia, glossitis and esophageal web. The cause of this syndrome is still not clear, but the most important one is thought to be the iron deficiency. The patient with small sized ageal web is treated by administration of iron but large sized web with dyspha gia requires breakage of web. In the following case report, we describe a patient with Plummer-Vinson syndrome who showed clinical improvement after treatmeat with endoscopic balloon dilatation of upper esophageal web with a review of literatures.