• Title, Summary, Keyword: Conservative Areas

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A study on DCGL determination and the classification of contaminated areas for preliminary decommission planning of KEPCO-NF nuclear fuel fabrication facility

  • Cho, Seo-Yeon;Kim, Yong-Soo;Park, Da-Won;Park, Chan-Jun
    • Nuclear Engineering and Technology
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    • v.51 no.8
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    • pp.1951-1956
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    • 2019
  • As a part of the preliminary decommissioning plan of KEPCO-NF fuel fabrication facility, DCGLs of three target radionuclides, 234U, 235U, and 238U, were derived using RESRAD-BUILD code and contaminated areas of the facility were classified based on contamination levels from the derived DCGLs. From code simulations, one-room modeling results showed that the grinding room in building #2 was the most restrictive (DCGLgross = 10493.01 Bq/㎡). The DCGLgross results in contaminated areas from one-room modeling were slightly more conservative than three-room modeling. Prior to the code simulation, field survey and measurements conducted by each survey unit. For a conservative approach, the most restrictive DCGLgross in each survey unit was taken as a reference to classify the contaminated areas of the facility. Accordingly, seven rooms and 37 rooms in the nuclear-fuel buildings were classified as Class 1 and Class 2, respectively. As expected, fuel material handling and processing rooms such as the grinding room, sintering room, compressing room, and powder collecting room were included in the Class 1 area.

Conservation Area Designation Method for Natural Environmental Management in a Rural Local Government (자치단체지역의 자연환경관리를 위한 보전지역 설정)

  • Lee, Gwan-Gyu;Sung, Hyun-Chan;Choi, Jaeyong
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.10 no.5
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    • pp.1-9
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    • 2007
  • Local government with abundant natural resources should consider the nature conservation oriented planning process for the sustainable development. With this regard, the aim of this study is to provide a substantial methodology to support the decision-making process to designate the conservation areas. The objectives of the proposed methodology is to conserve natural resources in the local government's territory through quantitatively assessing the values of the natural resources based on various ecological factors such as topography, flora and fauna. In order to test the usability of the method, Gangneung City in Kangwon-Do is selected considering the latest data availability. Based on the assessment process land use of the subjected city could be categorized into 4 levels of conservative area, conservative level 1 area, conservative level 2 area, and conservative level 3 area. Among them, conservative area and conservative level 1 area could be combined as natural resources conservation area and the others could be regarded as buffer and transitional area. Especially conservation area is surrounded by conservation level 2 area. Conclusively, the GIS methods adopted in this could be the efficient illustrative tool to assess the local natural resource values with the central government established nature-environmental information systems.

Mental nerve paresthesia secondary to initiation of endodontic therapy: a case report

  • Andrabi, Syed Mukhtar-Un-Nisar;Alam, Sharique;Zia, Afaf;Khan, Masood Hasan;Kumar, Ashok
    • Restorative Dentistry and Endodontics
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    • v.39 no.3
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    • pp.215-219
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    • 2014
  • Whenever endodontic therapy is performed on mandibular posterior teeth, damage to the inferior alveolar nerve or any of its branches is possible. Acute periapical infection in mandibular posterior teeth may also sometimes disturb the normal functioning of the inferior alveolar nerve. The most common clinical manifestation of these insults is the paresthesia of the inferior alveolar nerve or mental nerve paresthesia. Paresthesia usually manifests as burning, prickling, tingling, numbness, itching or any deviation from normal sensation. Altered sensation and pain in the involved areas may interfere with speaking, eating, drinking, shaving, tooth brushing and other events of social interaction which will have a disturbing impact on the patient. Paresthesia can be short term, long term or even permanent. The duration of the paresthesia depends upon the extent of the nerve damage or persistence of the etiology. Permanent paresthesia is the result of nerve trunk laceration or actual total nerve damage. Paresthesia must be treated as soon as diagnosed to have better treatment outcomes. The present paper describes a case of mental nerve paresthesia arising after the start of the endodontic therapy in left mandibular first molar which was managed successfully by conservative treatment.

A CONSERVATIVE APPROACH FOR THE NON-INFLAMMATORY GINGIVAL RECESSION IN MIXED DENTITION (혼합치열기 아동의 비염증성 치은퇴축에 대한 보존적 접근)

  • Kim, Shin;Min, Yun-Kyung
    • JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
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    • v.23 no.4
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    • pp.893-898
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    • 1996
  • The occlusal disharmonies resulted from labially protruded or malpositioned teeth can damage the periodontium and induce the non-inflammatory gingival recession. For these cases, a conservative approach was performed by improving oral hygiene and correcting the axial and positional status of the gingivally recessed teeth and removing the prematurely contacted areas. In some cases, rapid remission of tooth mobility and gradual decrease of gingival recession was observed just after start of treatment. In cases of gingival recession in permanent lower incisors of the children with mixed dentition, the treatment of choice is non-surgical conservative approaches. In cases when the gingival inflammation can be controlled through reinforcing the oral hygiene, when attached gingiva have a potential to increase in width through growth (not more than 1 year after eruption or not yet arrived at adult level), and when the recession can be corrected by moving the teeth from labial cortical plate through orthodontic treatment, the conservative measures would be the first choice. On the contrary, when recession has exceeded beyond the level of CEJ, when the gingival inflammation existed with the cause of poor oral hygiene, when the attached gingiva have little potential to increase (for example, more than 8 years after eruption), and when the conservative measures yielded no benefit after 4-8 weeks of treatment, the surgical approaches should be sought.

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Comparison of root canal preparation by three Ni-Ti instruments

  • Shibutani, Takuya;Ozaki, Kazumi;Matsuo, Takashi
    • Proceedings of the KACD Conference
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    • pp.547-547
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    • 2003
  • The aim of this study was to compare the effects of three Ni-Ti instruments on leaning ability by evaluating the volumetric and morphological changes in the apical 6mm of the root canals before and after preparation, using three-dimensionally reconstructed root canals of extracted human teeth. Forty-five teeth were used in this study. They were opened the chambers and removed the all pulp remnants ultrasonically. Subsequently, the canal wall was coated with silver paste and prepared using ProTaper, ProFile and GT rotary files according to the manufacturers instructions. Before and after root canal preparation, all the specimens were scanned with micro computed tomography and examined the differences in dentine volume removed, canal straightening, the proportion of the unchanged area and canal transportation. Quantitative analysis revealed that instrumentation increased in canal volume ranging between 0.081 and $1.866{\;}\textrm{mm}^3$. On average, the large apical preparation produced by ProTaper demonstrated smaller proportions of unchanged surface areas compared to the two other instruments in small canals. But in large canals like maxillary central incisor, the preparation of ProTaper instruments was not enough. ProTaper instrument was tended to increase more in canal volume as compared with the other two instruments but unchanged area was no significant difference. These results showed that three instruments had similar preparation ability and micro computed tomography in combination with the coated wall of root canal using silver paste is a nondestructive and valuable tool to study root canal geometry and changes after preparations in detail.

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MANAGEMENT OF FIBROUS HYPERPLASIA IN ORAL MUCOSA (구강점막에 발생한 섬유성 과증식의 처치)

  • Ham, Sun-Young;Song, Chang-Kyu;Park, Se-Hee;Kim, Jin-Woo;Cho, Kyung-Mo
    • Restorative Dentistry and Endodontics
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    • v.34 no.4
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    • pp.340-345
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    • 2009
  • There are a number of situations where the oral mucosa can be sucked or pressed to produce relatively banal but clinical distinctive changes. The labial and buccal mucosa and tongue may develop protuberances in areas where a tooth is missing or extra space is present. The mucosa is pressed and sucked into these spaces, thus leading to the development of a fibrous hyperplasia. This case report describes the management of fibrous hyperplasia in oral mucosa. Fibrous hyperplasia can be formed by habitual pressure or suction in oral mucosa. Treatment of fibrous hyperplasia consists of simple excision and, if feasible, elimination of the cause. And habit control is a important factor for preventing recurrence.

The Relationship between General Programming TV's News Ratings and the Vote Shares of Conservative Parties (종합편성채널의 뉴스보도 시청률과 보수 정당의 선거득표율 간의 관계)

  • Lee, Seung Yeop;Lee, Sang Woo
    • The Journal of the Korea Contents Association
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    • v.17 no.8
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    • pp.80-89
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    • 2017
  • Television viewing affects viewers' attitudes and opinions on their political issues. Since the beginning of General Programming TV services in 2011, they are criticized of their politically biased programming. In order to investigate the effect of General Programming TV on voters' behavior, we analyzed whether or not there is a change in the voting behavior of the conservative parties among the areas with high and low TV ratings of general programming TV. Based on the result of 18th presidential election in December 2012, we could not find any difference in voting behavior on the Saenuri party among the areas with high and low ratings of general programming TV channels. However, in the 6th provincial election in June 2014, while the voting shares of the Saenuri party were higher in the areas with high ratings of TV Chosun, Channel A, and JTBC than in those areas with low ratings.

Dosimetric Evaluation of 3-D Conformal and Intensity-modulated Radiotherapy for Breast Cancer after Conservative Surgery

  • Mansouri, Safae;Naim, Asmaa;Glaria, Luis;Marsiglia, Hugo
    • Asian Pacific Journal of Cancer Prevention
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    • v.15 no.11
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    • pp.4727-4732
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    • 2014
  • Background: Breast cancers are becoming more frequently diagnosed at early stages with improved long term outcomes. Late normal tissue complications induced by radiotherapy must be avoided with new breast radiotherapy techniques being developed. The aim of the study was to compare dosimetric parameters of planning target volume (PTV) and organs at risk between conformal (CRT) and intensity-modulated radiation therapy (IMRT) after breast-conserving surgery. Materials and Methods: A total of 20 patients with early stage left breast cancer received adjuvant radiotherapy after conservative surgery, 10 by 3D-CRT and 10 by IMRT, with a dose of 50 Gy in 25 sessions. Plans were compared according to dose-volume histogram analyses in terms of PTV homogeneity and conformity indices as well as organs at risk dose and volume parameters. Results: The HI and CI of PTV showed no difference between 3D-CRT and IMRT, V95 gave 9.8% coverage for 3D-CRT versus 99% for IMRT, V107 volumes were recorded 11% and 1.3%, respectively. Tangential beam IMRT increased volume of ipsilateral lung V5 average of 90%, ipsilateral V20 lung volume was 13%, 19% with IMRT and 3D-CRT respectively. Patients treated with IMRT, heart volume encompassed by 60% isodose (30 Gy) reduced by average 42% (4% versus 7% with 3D-CRT), mean heart dose by average 35% (495cGy versus 1400 cGy with 3D-CRT). In IMRT minimal heart dose average is 356 cGy versus 90cGy in 3D-CRT. Conclusions: IMRT reduces irradiated volumes of heart and ipsilateral lung in high-dose areas but increases irradiated volumes in low-dose areas in breast cancer patients treated on the left side.

AN ELECTROCHEMICAL STUDY ON THE OXIDATION' AND REDUCTION OF DENTAL AMALGAM (치과용 아말감의 산화환원에 관한 전기화학적 연구)

  • Yi, In-Bog;Lee, Myong-Jong
    • Restorative Dentistry and Endodontics
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    • v.18 no.2
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    • pp.431-445
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    • 1993
  • The purpose of this study was to observe corrosion characteristics of six dental amalgams and was to analyse corrosion products electrochemically. After each amalgam alloy and Hg was triturated as the direction of the manufacturer by using mechanical amalgamator, the triturated mass was inserted into the cylinderical metal mold ($12{\times}10mm$) and was condensed with 160kg/$cm^2$ by using the hydrolic press. The specimen was removed from the mold and was stored at room temperature for 1 week, and was polished with amalgam polishing kit. The anodic and cathodic polarization curve was obtained by using cyclic voltammetric method with 3-electrode potentiostat in saline for each amalgam and Ag, Sn, Cu plate specimen at $37{\pm}0.5^{\circ}C$. The potential sweep range was -1.7V~0. 4V(vs SCE) in working electrode and scan rate was 50mV/s and the exposed surface area of each specimen to the electrolytic solution was $0.79cm^2$. The results were as follows. 1. In anodic-cathodic polarization curve of amalgam specimens, two anodic current rising areas and two cathodic current peaks were obtained at the low Cu amalgam(CF, CS) specimen and three anodic current rising areas and three cathodic current peaks were obtained at the high Cu amalgam (TY, DS, HV) specimen. 2. As this compared with the anodic and cathodic current peak potentials of Sn, Cu and Ag specimen, the first cathodic current peak I c was caused by the reduction of divalent tin salt, second cathodic current peak IIIc results from the reduction of quadravalent tin salt, and third cathodic current peak me results from the reduction of copper salt. 3. As reverse potential sweeping was done repeatedly, anodic current was decreased slightly in all amalgam specimens.

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Application of IUCN Category Regarding the Designation of Overlapping Protected Areas (중복지정된 보호지역을 고려하기 위한 IUCN 카테고리 적용)

  • Kil, Sung Ho;Lee, Dong-Kun;Sung, Hyun Chan;Lee, Gwan-Gyu;Kim, Ho Gul;Koo, Meehyun;Mo, Yong Won
    • Journal of Environmental Impact Assessment
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    • v.23 no.2
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    • pp.157-167
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    • 2014
  • The purpose of this study is to seek the application of IUCN categories of overlapping protected areas which is legally designated in South Korea. Different government departments in South Korea have managed and designated as protected areas. However, the protected areas due to different management agencies can be confused with restricting behaviors and supporting residents. The IUCN presents the reasonal standardization classifying the protected areas which could be applied all over the world. Six categories issued by the IUCN could be applied to deal with the problems of the overlapping protected areas. We suggested the application of the IUCN categories compared with legal frame in South Korea. Most areas are overlapped in designation, but the areas are important for ecology and landscape. Moreover, each protected areas in South Korea have zone districts. Comprehensively considered all these things, we made rationale matrix correlated with the IUCN categories and the zone districts of the protected areas in South Korea. For the result of this study, this matrix could be helped to the application of the IUCN categories in domestic protected areas. Although the protected areas has been recognized as regulatory regions, it is expected to expand and sustain the areas based on the matrix.