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전옥희 ( Jeon Ok-hee ),홍경식 ( Hong Kyung-sik ),현철승 ( Hyun Cheol-seung ),안계형 ( Ahn Gye-hyeong ) 한국도로교통공단 2012 교통안전연구 Vol.31 No.-
교통 분야에서 딜레마구간으로 인한 안전문제는 과거부터 현재까지 여전히 지속되고 있다. 딜레마구간 문제를 해결하기 위해서는 검지기를 설치하거나 교차로 상황에 적합한 황색신호를 부여해야 하지만 시간적, 재정적으로 많은 한계가 따른다. 본 연구에서는 수도권 지방자치단체를 중심으로 구축ㆍ운영 중인 ITS 무선통신 인프라인 UTIS를 활용하여 딜레마구간 운전자 경고시스템을 개발하였다. 개발된 딜레마 운전자 경고시스템은 OBE를 장착한 차량이 RSE통신영역에 진입 시 OBE가 RSE로부터 거리, 녹색잔여시간 등의 정보를 수신하여 황색등화 시 차량이 딜레마구간에 포함될지를 예측하여 운전자에게 경고해주는 시스템이다. 이러한 시스템의 구현을 위하여 딜레마구간 경고 알고리즘을 검토하였으며 RSE, OBE, 신호제어기 간의 정보연계 인터페이스를 구축하고 딜레마 경고 알고리즘을 구현하였다. 또한 H/W 및 S/W 부문의 개발을 통해 UTIS 기반 딜레마구간 운전자 경고시스템을 구축하였으며 현장시험을 통해 알고리즘의 적용 타당성과 경고시스템의 유효성을 확인하였다. 본 연구에서 개발된 시스템을 추가 연구 수행을 통해 보완하여 실용화한다면 교차로 통행안정성을 높이며 교차로 내 사고방지 및 사고로 인한 도로지체 등을 사전에 방지하여 도로운영 효율성을 증진시킬 수 있을 것으로 기대된다.
전이성 골암에 의한 해면골의 미세구조와 골화 분포 변화
박선욱,전옥희,고창용,김지현,김한성,전경진,임도형,Park, Sun-Wook,Jeon, Ok-Hee,Ko, Chang-Yong,Kim, Chi-Hyun,Kim, Han-Sung,Chun, Keyoung-Jin,Lim, Do-Hyung 대한의용생체공학회 2009 의공학회지 Vol.30 No.5
Purpose: The aim of present study is to detect longitudinal alterations of mechanical characteristic determined by bone quality (microarchitecture and degree of mineralization) on femur trabecular bone due to metastatic bone tumor Materials and Methods: Each 6 female SD rats (12 weeks old, approximate 250g) were allocated in SHAM and TUMOR Group. W256 (Walker carcinosarcoma 256 malignant breast cancer cell) was injected into the right femur (intraosseous injection) in TUMOR Group, whereas 0.9% NaCl (saline solution) was injected in SHAM Group. The right hind limbs of all rats were scanned by in-vivo micro-CT to acquire structural parameters, bone mineral density, X-ray attenuation and bone mineralization distribution at 0 week and 4 weeks after surgery. Results: BMD, BV/TV and Tb.N of trabecular bone in TUMOR group were markedly decreased (26%, 11% and 23%) while those in SHAM group were significantly increased (34%, 48% and 11%) (p<0.05). BS/BV, Tb.Sp and SMI in TUMOR group were significantly increased (-16%, 38% and 2%) compared with those in SHAM group (-33%, 12% and -16%) (p<0.05). Additionally, bone mineralization in TUMOR group significantly decreased while those in SHAM group was significantly increased (p<0.05). Conclusion: It is identified that how much bone microarchitecture and mineralization are diminished due to the metastatic bone tumor. The results may be helpful to prediction of fracture risk by metastatic bone tumor.
저출력 레이져 자극이 근육세포의 증식 및 유전자 발현에 미치는 효과
곽지현,전옥희,강동연,유현희,김경환,정병조,김지현,Kwag, J.H.,Jeon, O.H.,Kang, D.Y.,Ryu, H.H.,Kim, K.H.,Jung, B.J.,Kim, C.H. 대한의용생체공학회 2010 의공학회지 Vol.31 No.1
Laser irradiation is known to affect various tissues such as skin, bone, nerve, and skeletal muscle. Laser irradiation promotes ATP synthesis, facilitates wound healing, and stimulates cell proliferation and angiogenesis. In skeletal muscle, laser irradiation is related to the proliferation of skeletal muscle satellite cells. Normal skeletal muscle contains remodeling capacity from myogenic cells that are derived from mononuclear satellite cells. Their processes are activated by the expression of genes related with myogenesis such as muscle-specific transcription factors (MyoD and Myf5) and VEGF (vascular endothelial growth factor). In this study, we hypothesized that laser irradiation would enhance and regulate muscle cell proliferation and regeneration through modulation of the gene expressions related with the differentiation of skeletal muscle satellite cells. $C_2C_{12}$ myoblastic cells were exposed to continuous/non-continuous laser irradiation (660nm/808nm) for 10 minutes daily for either 1 day or 5 days. After laser irradiation, cell proliferation and gene expression (MyoD, Myf5, VEGF) were quantified. Continuous 660nm laser irradiation significantly increased cell proliferation and gene expression compared to control, continuous 808nm laser irradiation, and non-continuous 660nm laser irradiation groups. These results indicate that continuous 660nm laser irradiation can be applied to the treatment and regeneration of skeletal muscle tissue.
박선욱 ( Sun Wook Park ),전옥희 ( Ok Hee Jeon ),김지현 ( Chi Hyun Kim ),김한성 ( Han Sung Kim ),전경진 ( Keyoung Jin Chun ),임도형 ( Do Hyung Lim ) 한국조직공학·재생의학회 2010 조직공학과 재생의학 Vol.7 No.1
Bone is one of the most favored sites of tumor metastasis. However, the existent animal models developed to understand mechanism of occurrence and progress of metastatic bone tumor generally showed difficulties of reproducibility and performance of longitudinal study, and inaccuracy of validation. The aim of this study was, therefore, to newly develop and accurately validate an animal model for study of metastatic bone tumor with overcome of the limitations shown in the existent animal models. Eighteen female Sprague-Dawley rats (12 weeks old, 250+7 g) were randomly allocated in Sham and Tumor groups. W256 breast cancer cell was inoculated in the right femur of the rat for Tumor group, while 0.9% NaCl was injected for Sham group. Urine was collected by metabolic cages for DPD (deoxypyridinoline) test in order to evaluate bone resorption at 0, 4, 8, 12 weeks after surgery. At the same time, the right hind limbs of all rats were scanned by in-vivo micro-computered tomography (CT) to identify tumor-mediated bone destruction driven from metastatic bone tumor. Finally, positron emission tomography was examined to directly identify existence of tumor cells inoculated in the bone. DPD test showed that bone resorption markedly increased in the bone of Tumor group compared to that of Sham group (p<0.05). In-vivo micro-computed tomography showed that there were significant bone losses and X-ray attenuation values in the bone of Tumor group compared to that of Sham group after surgery. In addition, tumor cells were directly identified in the bone of Tumor group by positron emission tomography, not in the bone of Sham group. The results indicated that the developed animal model might be confidential and reasonable to performances of studies related to metastatic bone tumor, with easy reproducibility, accuracy of validation, and suitability to performance of longitudinal study. To our knowledge, this study may prove valuable as the first development of the animal model overcoming the limitations shown in the existent animal models. The animal model developed in the present study may be useful for further metastatic bone tumor studies as mentioned.
김유찬(Kim, Yu-Chan),전옥희(Jeon, Ok-Hee) 한국조세연구포럼 2013 조세연구 Vol.13 No.3
지방세 비과세ㆍ감면제도는 정책세제로서의 역할을 수행하고 있다. 동 제도는 일부에게만 혜택을 준다는 점에서 과세형평성을 침해하고, 지방자치단체의 재정여건을 고려하지 않는다는 문제가 있다. 또한 국가의 정책적 목적을 위하여 획일적으로 적용되어 지방재정을 열악하게 하는 문제점을 가진다. 지방세 비과세와 감면에 대한 결정은 공익성, 국가의 경제 · 사회 정책, 조세의 형평성, 조세부담능력 및 지방자치단체의 재정여건 등을 종합적으로 고려하면서 이루어져야 할 것이다. 특히, 국가 등에 대한 지방세 비과세는 공공성과 수익성, 자원배분의 효율성, 지방자치단체의 재정적 측면에서 문제를 발생시키고 있다. 본 연구에서는 지방세 비과세 대상 중 국가 등에 대한 비과세로 한정하여 문제점 및 개선방안을 제시하고자 하였다. 첫 번째, 국가 등 소유재산의 공공성 여부와 관계 없는 무분별한 비과세 적용의 문제에 대하여 수익사업용 국?공유재산에 대하여는 재산세를 중심으로 과세하는 방안을 제시하였다. 두 번째, 민간업체와의 경쟁관계에 대한 고려 없이 적용되는 국가 등 소유재산의 비과세에 따른 자원배분의 비효율성 문제에 대하여 민간업체와 경쟁관계의 국?공유재산에 대하여는 자원배분의 효율성에 근거하여 과세하는 방안을 제시하였다. 세 번째, 국가 등에 대한 지방세 비과세로 발생하는 지방자치단체의 세수결손 문제에 대하여 중앙정부가 별도의 교부세 신설을 통하여 세수결손을 보전하는 방안을 제시하였다. 네 번째, 지방자치단체간 과세에 따른 경제적ㆍ재정적 이해 충돌의 문제에 대하여 세입의 일부를 국가 등 재산이 소재한 지방자치단체에 이전하는 방안을 제시하였다. Local tax exemption system allows the infringement of the equality of taxation in giving the benefits for some part of tax payers, and ignores the government"s financial conditions. And it is applied uniformly for the policy goals of central government. The local tax exemption and reduction will be determined while considering the public interest, the country"s economic and social policy, equality of taxation, the tax burden on the ability of the local government financial conditions. Local tax exemption system especially for public use of land causes problems on the finance of local authorities, on the profitability, and on the efficiency in resource allocation. In this study, we limit our scope to the local tax exemption supplied to public use of land and try to suggest ways to improve the problem. First, for the state-owned property used for business purpose we suggest to tax. Second, for the state-owned property in competing with private companies we suggest also to tax for the efficiency of resource allocation. Third, the problem of revenue deficits by local governments that occur in the process of tax exemption for public use of land, we suggest that the central government proposed measures to conserve revenue deficits through the establishment of a separate grant tax. Fourth, in case of conflicts between the local governments regarding the revenue affiliation we suggest to shift the part of the revenue to the local authorities of property location.