• 대한치과의사협회지
• /
• 제55권7호
• /
• pp.450-456
• /
• 2017

The purpose of this case report is to present a case of free gingival graft for treatment of mandibular incisor labial gingival recession relapsed after laterally positioned flap surgery. A 22 year-old female patient with discomfort and labial gingival recession on left mandibular central incisor was treated. The patient had been treated root coverage on same site by laterally positioned flap surgery, but treated site had relapsed in one month. Exposed root surface was covered by free gingiva from left palatal area. Although gingival color did not completely match with adjacent gingiva, more than 5mm keratinized gingiva was attained. The patient showed no further recurring pain and recession on gingiva after 5 months from the surgery. In conclusion, the root coverage with gain of keratinized gingiva could be achieved through free gingival graft from palate on relapsed gingival recession.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2004년도 춘계학술발표회
• /
• pp.475-482
• /
• 2004

The purpose of this paper is to study on the investigation of abandoned waste landfill for rehabilitation. The geotechnical and environmental field and laboratory tests for wastes dumped at municipal site were carried out. Testing wastes were sampled at the illegal landfill site The various samples such as waste. soil, groundwater, gas, leachate were taken in the landfill site. As a result of this study, the engineering properties and concentration of samples were investigated The result of this study was used for introduction the rehabilitation method and treatment of unregulated closed landfill.

• 한국농공학회:학술대회논문집
• /
• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
• /
• pp.569-574
• /
• 1999

In Soft ground of south-western coast of our country necessity of marine indutrial complex and container facility has been remarkable. Site construction for habor facility is one of the most urgent problems. Consolidation of dredged fill has become important task. In addition, volume change of dredged fill should be examined carefully. This study dealt with consolidation of dredged fill by PCDDF and in order to secure trafficability of heavy equipment for surface treatment should be studied.

• Restorative Dentistry and Endodontics
• /
• 제43권4호
• /
• pp.36.1-36.12
• /
• 2018

Objectives: Direct pulp capping is a treatment for mechanically exposed pulp in which a biocompatible capping material is used to preserve pulpal vitality. Biocompatibility tests in animal studies have used a variety of experimental protocols, particularly with regard to the exposure site. In this study, pulp exposure on the occlusal and mesial surfaces of molar teeth was investigated in a rat model. Materials and Methods: A total of 58 maxillary first molars of Wistar rats were used. Forty molars were mechanically exposed and randomly assigned according to 3 factors: 1) the exposure site (occlusal or mesial), 2) the pulp-capping material (ProRoot White MTA or Bio-MA), and 3) 2 follow-up periods (1 day or 7 days) (n = 5 each). The pulp of 6 intact molars served as negative controls. The pulp of 12 molars was exposed without a capping material (n = 3 per exposure site for each period) and served as positive controls. Inflammatory cell infiltration and reparative dentin formation were histologically evaluated at 1 and 7 days using grading scores. Results: At 1 day, localized mild inflammation was detected in most teeth in all experimental groups. At 7 days, continuous/discontinuous calcified bridges were formed at exposure sites with no or few inflammatory cells. No significant differences in pulpal response according to the exposure site or calcium-silicate cement were observed. Conclusions: The location of the exposure site had no effect on rat pulpal healing. However, mesial exposures could be performed easily, with more consistent results. The pulpal responses were not significantly different between the 2 capping materials.

• Applied Microscopy
• /
• 제45권3호
• /
• pp.177-182
• /
• 2015

The boiler tubes of X20CrMoV12.1 used in fossil-fired power plants were obtained and analyzed for the effect of water treatment on the steam corrosion-induced oxide scale in an effort to better understand the oxide formation mechanism, as well as pertinent method of maintenance and lifetime extension. The specimens were analyzed using various microscopy and microanalysis techniques, with focuses on the effect of water treatment on the characters of scale. X-ray diffraction analysis showed that the scales of specimens were composed of hematite ($Fe_2O_3$), magnetite ($Fe_3O_4$), and chromite ($FeCr_2O_4$). Electron backscatter diffraction analysis showed that the oxides were present in the following order on the matrix: outer $Fe_2O_3$, intermediate $Fe_3O_4$, and inner $FeCr_2O_4$. After all volatile treatment or oxygenated treatment, a dense protective $Fe_2O_3$ layer was formed on the $Fe_3O_4$ layer of the specimen, retarding further progression of corrosion.

• 동의생리병리학회지
• /
• 제26권3호
• /
• pp.314-319
• /
• 2012

Itching is one of the major diagnostic criteria of atopic dermatitis (AD) and one of its most troublesome symptoms that provokes the desire to scratch. Effective control of itching is believed to be one of the basic approaches in controlling AD. The purpose of this study was undertaken to investigate the antipruritic effect of ethanol extracts from Perillae Japonicae Semen leaves (PJSL) and Chaenomelis Fructus (CF) on the scratching behavior induced by pruritogen such as compound 48/80 or substance P in hairless mice. PJSL or CF treatment inhibited histamine release in HMC-1 stimulated compound 48/80 or substance P in a dose-dependant manner. In particularly, co-treatment PJSL ($50{\mu}g/mL$) plus CF ($100{\mu}g/mL$) significantly inhibited histamine release in HMC-1 stimulated compound 48/80 or substance P. PJSL, CF or PJSL plus CF was administered orally for 2 h and then compound 48/80 ($50{\mu}g/site$) or substance P ($100{\mu}g/site$) was injected into rostral back, and scratching of the injected site by the hind paw was counted for 1 h. PJSL or CF administration reduced the scratching behavior induced by compound 48/80 as well as substance P in a dose-dependent manner. Furthermore, co-administration of PJSL and CF markedly suppressed the scratching behavior induced by compound 48/80 as well as substance P. These suppressive effects were synergistically increased by their combination. From the preliminary observations, we considered that ethanol extracts from PJSL and CF could be an effective natural materials for itching treatment.

• 대한족부족관절학회지
• /
• 제9권1호
• /
• pp.131-134
• /
• 2005

Purpose: The purpose of this study was to investigate the clinical results of conservative treatment for Morton's neuroma and to analyze the factors which influenced on the results. Materials and Methods: In this retrospective study, 101 cases of 83 patients with interdigital neuroma were conservatively treated with follow-up period of at least 6 months. There was no significant difference in results among different age groups, sxes, and lesion sites. However, the results were significantly better if the treatment was started within 6 months after onset. Results: We had 28 excellent results (28%), and 13 good results (13%). Patients were grouped by sex, age, duration of symptom before treatment, affected location. The result of treatment was evaluated by comparing the subject pain and discomfort score of the first vist and last follow-up. Conclusion: There are excellent results over 41% by conservative treatment. The results of conservative treatment were not related to age, sex, and lesion site, but were related to pre-treatment period. The shorter the pretreatment period was, the better the results.

• 한국도로학회논문집
• /
• 제14권6호
• /
• pp.149-158
• /
• 2012

PURPOSES : This research is to evaluate the effects of zig-zag marking. METHODS : Based on the literature review, This research adopt Comparison Group method which was developed by Hauer. RESULTS : The findings are as follows. Effectiveness of treatment at all site 1.06, intersection 0.92, median bus lane 1.93, school zone 0.50, below 6-lane 0.48, above 6-lane 1.19, cat vs person 0.57, car vs car 1.36, car only 1.29. CONCLUSIONS : Though the analysis, it was founded that zig-zag marking on the small scale road(below 6-lane) and school zone contribute to reduce traffic accidents(effectiveness of the treatment : 0.50, 0.48). But the accidents at large scale road and median bus lane where installed zig-zag marking demonstrated negative result.(effectiveness of the treatment indicates exceed 1.0).

• 한국토양환경학회지
• /
• 제1권2호
• /
• pp.3-13
• /
• 1996

생물학적 복구법의 효율은 미생물 균수의 계수, 호흡율, 분해율 등으로 측정할 수 있으며 부작용 시험은 Daphnia,굴의 유충, 무지개 송어 를 사용하여 측정된다. On-Site처리에 있어서는 산소 전달이 문제가 되는데 이에는 과산화 수소가 사용될수 있으며(벤젠계통의 용매), 유류오염 방제시에는 친유화적 질소 및 인을 첨가할 수 있다. 접종균주는 혼합균주 또는 순수 균주가 사용되는데 후자에는 Pseudomonas와 Phaneochate 등이 있다. 때로는 효울을 높이기 위해 효소를 첨가 하거나 광분해법과 병용되기도 한다. 토양의 유류오염물질, 예컨대 폐윤활유, 기계유, 오일 슬러지들을 처리할때는 토양상부 15∼20cm를 갈고 유류오염물질을 5%의 농도로 주입한다. 이 때 적정 pH는 7∼8, 탄화수소 질소 = 100 : 1, 탄화수소 : 인 = 800 : 1이며 적절한 배수가 필요하다. 지하 유류오염물질의 처리에 있어서는 특히 다량의 산소가 필요하며 해양유류오염물질의 처리에 있어서는 친유화성 비료를 첨가하면 효과가 있다 생물학적 복구법에 의해 대기오염물질 특히, 악취 물질을 처리할 수 있는데 반응기로는 생물여과법과 생물세정기가 쓰인다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2008년도 추계 학술발표회
• /
• pp.1463-1474
• /
• 2008

In order to investigate stabilization effect and sustainability on As-contaminated farmland soils which were affected the abandoned mine site and stabilized by zerovalent iron(ZVI) and industrial by-products, batch-scale and pilot-scale tests were carried out. In batch tests, ZVI and industrial by-products(blast furnace slag, steel refining slag and oyster shell powder) were used in treatment materials to reduce the As leaching. Industrial by-products were mixed with As-contaminated soils, in the ratio of 1%, 3%, 5% and 7% on the weight base of dried soil. The results of batch-scale tests was shown that the reduction of As concentration was observed in all samples and it was expected that ZVI and steel refining slag were more effective than other treatment materials to stabilize As compounds. In pilot-scale tests, columns were filled with untreated soils and treated soils mixed with ZVI and steel refining slag in the same mixing ratio of 3%. Distilled water was discharged into the columns with the velocity of 0.3 pore volume/day. During the test, pH, EC, Eh and As concentration were measured in the regular term(1pore volume). after six months, pilot-scale tests were retested to investigate sustainability of treatment materials. As a result, It was shown that the leachate from control column was continuously released during the test period and its concentration was greater than $100ug{\cdot}L^{-1}$ which was exceeded the national regulation of water discharged to river or stream ($50ug{\cdot}L^{-1}$). On the other hand, soil treated with ZVI and steel refining slag showed that the concentrations of leachate were lower than national regulation of water discharged to river or stream. Therefore it was expected that ZVI and steel refining slag could be applied to the farmland site as the alternative treatment materials.