• 한국환경복원기술학회지
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• 제11권2호
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• pp.123-132
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• 2008

The problems caused by new biological organisms in Ogasawara Island of Japan include : (1) loss of native species' habitats and extinction of native species due to the multiplication of invasive species; (2) reduction of native species and confusion in the food chain in result of invasive species' predation; (3) confusion in genes due to hybridization of new and native plants; and (4) destruction of ecosystem and erosion of earth due to rapid increase of invasive species. The natural ecosystem of preserved areas in Korea is constantly confused and destroyed by new animals and plants, but Korea does not has any solutions because new animals and plants rarely affect human lives. Invasive species are manually introduced by humans and are considered disasters caused by humans. Korea is in desperate need of campaigns as the general public does not understand the seriousness of the destruction and confusion of natural ecosystem caused by new biological organisms and their indirect/direct influences on humans. It is necessary to evaluate the biological characteristics, ecological influence, and harms of invasive species in preserved areas to establish a system to manage invasive species and plan the priority removal of species that are highly harmful and locally distributed. Manual removal and suppression of new biological organisms that cause problems is effective, but it takes cost, effort, and time. Therefore, we would need to research and develop the most efficient and effective techniques and measures to manage invasive species in our ecosystem.

• Archives of Plastic Surgery
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• 제39권5호
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• pp.509-513
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• 2012

Background The extended latissimus dorsi flap is important for breast reconstruction. Unfortunately, donor site seroma is the most common complication of extended latissimus dorsi flap for breast reconstruction. Although using fibrin sealant in the donor site reduces the rate of seroma formation, donor site seroma remains a troublesome complication. The purpose of this study was to analyze the effectiveness of the combination of quilting sutures and fibrin sealant in the latissimus dorsi donor site for the prevention of seroma. Methods Forty-six patients who underwent breast reconstruction with extended latissimus flap were enrolled in the study. The patients received either fibrin sealant (group 1, n=25) or a combination of fibrin sealant and quilting sutures (group 2, n=21) in the extended latissimus dorsi donor site. Outcome measures were obtained from the incidence, volume of postoperative seroma, total drainage amount, indwelling period of drainage, and duration of hospital stay. Results The incidence of seroma was 76% in group 1 and 42.9% in group 2 (P=0.022). We also found significant reductions in seroma volume (P=0.043), total drainage amount (P=0.002), indwelling period of drainage (P=0.01), and frequency of aspiration (P=0.043). The quilting sutures did not affect the rate of drainage, tube reinsertion, or hospital stay. Conclusions The use of quilting sutures combined with fibrin sealant on the latissimus dorsi flap donor site is helpful for reducing the overall seroma volume, frequency of aspiration, and total drainage amount.

• Archives of Plastic Surgery
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• 제32권1호
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• pp.117-123
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• 2005

The reconstructive modalities for vaginal reconstruction include simple dilatation, skin graft, use of intestinal segments and various methods using flaps. However, skin grafting procedure is the most commonly used technique and the McIndoe procedure is a representative technique among skin grafting procedures. McIndoe procedure is easier, faster and has a lower morbidity compared to other techniques. However the conventional McIndoe procedure has several problems such as incomplete vestibule formation, excessive bleeding during dissection, possibility of recto-vaginal or urethro-vaginal fistula formation, late vaginal contracture and discomfort in wearing hard plastic mold for a long time after operation. To solve these problems, the authors modified the conventional McIndoe procedure in several perspectives. The undeveloped vestibule was incised with X-shaped mucosal incision between the urethral opening and posterior margin of the vestibule and deepened by blunt finger dissection to provide a sufficient diameter & length of the neovagina and to minimize bleeding. A sizable medium thickness split skin graft was harvested and wrapped over a roll gauze-filled condom mold. Applying multiple stab incision on the skin grafted condom mold, it was inserted into the prepared neovaginal canal. Distal margin of the skin graft was secured with tips of the mucosal flaps created by X-shaped vestibular incision to prevent accidental extrusion of the skin grafted mold. During last 15 years, we applied this modification to 20 vaginal agenesis patients and investigated results of the 12 patients who could be followed up serially including hematoma formation and skin graft survival rate, size, depth, presence of late contracture, appearance, comfortness, and hygiene of the neovagina. And they were compared with 8 patients of 20 patients who underwent conventional McIndoe procedures. The modified McIndoe procedure revealed lower complication rate, higher patient satisfaction and better functional results.

• 보존과학회지
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• 제32권1호
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• pp.51-61
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• 2016

어진御眞은 왕의 초상화로 조선시대에는 국조인 태조를 비롯하여 다수의 어진이 제작되어 영흥 준원전, 전주 경기전 등 여러 진전眞殿에 봉안奉安되었다. 이러한 어진은 이모移摸 과정을 통해 전해지고 있으며, 훼손된 어진의 경우 모사模寫 과정을 토대로 신본新本을 제작하였다. 근래에는 어진에 대한 다양한 학술적인 가치와 국민적인 관심 증대로 인하여 이모 작업이 활발하게 진행되고 있다. 국립고궁박물관에서는 다수의 어진을 보유하고 있는데, 소장본중 대부분이 한국전쟁 중 화재로 인해 손상된 상태로, 이모본 제작 과정에 필요한 초본 제작을 위해서는 범본範本이 되는 어진의 훼손된 부분에 관한 복원이 필요하다. 이 논문에서는 다분할 촬영 기법 및 이미지 분석 등의 디지털 이미징 기술을 활용하여, 국립고궁박물관 소장 태조어진의 훼손된 부분을 복원하는 과정과 이를 통해 밝혀진 태조어진 유물들의 용안의 차이를 중심으로 각 유물의 관계에 대해 연구한 것이다.

• 구강회복응용과학지
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• 제32권3호
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• pp.240-245
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• 2016

치은 연하 변연을 갖는 임플란트 수복물 장착시 잔여 합착제의 제거는 임플란트 생물학적 합병증을 예방하기 위해 매우 중요하다. 치은 연하 잔여 합착제를 최소화하기 위해 인상용 실리콘이나 자가중합형 레진을 이용하여 복제 지대주를 제작하는 여러 방법이 소개되었다. 본 증례에서는 열가소성 접착제(hot melt adhesive material)를 이용하여 복제 임플란트 지대주(abutment replica)제작하는 방법을 소개하고자 한다. 이 방법은 간단하고 부가적인 기공과정이 필요 없어 진료실에서 쉽게 이용할 수 있어 이에 보고하는 바이다.

• Ecology and Resilient Infrastructure
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• 제6권3호
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• pp.145-153
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• 2019

본 연구는 저수로 변화를 통한 하천 복원이 수생 서식처에 미치는 영향을 파악하기 위하여 원주천을 대상으로 물리서식처분석을 수행하였다. 대상 어종은 원주천에 서식하는 우점종인 피라미를 대상으로 하였다. 흐름 분석은 2차원 모형인 River2D 모형을 사용하였으며, 서식처 분석은 서식처 적합도 곡선을 이용하여 서식처의 양과 질을 산정하는 서식처 적합도 모형을 사용하였다. 먼저 저수로 복원을 위하여 자연 하도에 가까운 형태로 복원을 하고 저수로 폭을 확대 및 축소하여 설계하였다. 그 결과 저수로 폭의 변화를 확대하였을 때 대상 어종의 가중가용면적은 각각 약 72% 향상되었으며, 저수로 폭을 축소하였을 때는 서식처가 약 25% 악화되는 것으로 나타났다.

• Journal of Periodontal and Implant Science
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• 제52권2호
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• pp.91-115
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• 2022

Purpose: This systematic review aimed to compare the efficacy, defined in terms of the mean percentage of root coverage (mRC), of surgical treatment approaches combined with adhesive restorations of non-carious cervical lesions (NCCLs) to that of root coverage alone in patients with a single gingival recession (GR) and NCCL. Methods: A literature search was conducted to identify longitudinal studies reporting the mRC following treatment for the correction of GR defects associated with NCCLs using a combination of surgical and restorative techniques in systemically and periodontally healthy patients. Results: The search resulted in the retrieval of 12,409 records. Seven publications met the inclusion criteria for the qualitative synthesis of data. The mRCs ranged from 69% to 97%. In the medium term, the gingival margin position was more stable when a connective tissue graft (CTG) was used, independently of whether restoration of teeth with NCCLs was performed. Conclusions: The strength of the evidence was limited by methodological heterogeneity in terms of study design as well as the unit and period of analysis, which precluded a metaanalysis. Although no definitive conclusion could be drawn due to the lack of sufficient evidence to estimate the effectiveness of the interventions, CTG-based procedures contributed to gingival margin stability regardless of the performance of restoration to treat NCCLs.

• Architectural research
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• 제25권3호
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• pp.41-51
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• 2023

Building restoration is a complex process with a high level of uncertainty. Restoration professionals can significantly benefit from the well-established discipline of project management to achieve their targets; however, available evidence shows that the use of the project management body of knowledge in restoration projects is far from the desired level. Several historical organisations have since been established with the goal of preserving and governing cultural identity, and numerous studies have supported the need of preserving architectural heritage. Many owners, investors, academics, and developers believe that it would be considerably more expensive to renovate and restore an old building than to create a new one. Although the project management process is generally recognised, the concept of project management for architectural heritage projects differs due to the uniqueness of each project. It differs from many construction projects in terms of the need for research-based practices to define scope, planning, scheduling, supervision,decision-making,and also performance. The Greco-Roman Museum in Alexandria's planning, design, and building phases are being studied with the aim of identifying and analysing the variables that contribute to project delays. Three project management pillars were established as a result of gathering this data from the project's stakeholders: the first pillar addresses time management for the existing phase and how it will be incorporated into the new extension phase; the second pillar addresses performance in relation to project management issues in the delivery of the best quality of a construction project; and the third pillar addresses the scope of the new extension because it will significantly impact the other two pillars. This paper argues that a contemporary perspective which utilizes project management tools and techniques can contribute to the conservation of architectural heritage in line with the conservation principles.

• Restorative Dentistry and Endodontics
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• 제27권5호
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• pp.502-514
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• 2002

The aim of this study was to evaluate the marginal adaptation of direct class II sandwich restoration with packable composites(P-60), resin modified glass ionomer cement(Fuji-II LC), flowable compomer(Dyract Flow), flowable composites(Filtek Flow) in comparison with total bond restorations. In addition, for sandwich restorations, influence of different sandwich techniques was also evaluated. Large butt-joint box typed class II cavites with cervical margins 1mm below the cemento-enamel junction were cut into 70 extracted human molars. The cavities(7 groups, n=10) were filled using a closed/open sandwich restoration or total bond restoration technique with materials according to the manufacturer's recommandation using the single-component bonding agent for each system. Teeth were thermocycled 500 times between 5$^{\circ}C$ and 55$^{\circ}C$ with 30-second dwell time. The teeth were then coated with nail polish 1mm short of the restoration, placed in a 2% methylene blue for 24 hours, and sectioned with diamond wheel. Sections were examined with a stereoscope to determine the extent of microleakage. Dentine /Cementum margins were analyzed for microleakage on scale of 0(no leakage) to 4(entire axial wall) and interface between materials, on scale of 0(no leakage) to 3(axial wall). Results were evaluated with Kruskal Wallis Test, corrected for ties, to determine whether there were statistically significant differences among the seven groups. Pairs of groups were analyzed using the Student-Newman-Keuls Method and Dunn s Method. The results were as follows : 1. All groups showed some micoleakage in cervical portion. But there were no microleakage in interface between materials. 2. Closed sandwich restorations with Fuji-II LC and Filtek Flow had significantly lower leakage rating than total restorations with only P-60. However, open sandwich restorations with Dyract Flow showed significantly higher (P<0.05) 3. Closed sandwich restorations had significantly lower leakage rating than total restorations. However open sandwich restoration s showed significantly higher (P<0.05). 4. Sandwich restorations with Fuji-II LC were iou$.$or leakage than only P-60. Filtek Flow, Dyract Flow. But there were no statistically differences among the materials. From the results above, it could be concluded, closed sandwich restorations was effective in reducing microleakage of class II restorations. The best results showing the least microleakage were for the closed sandwich technique with Fuji-II LC and Filtek Flow.

• Archives of Plastic Surgery
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• 제36권5호
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• pp.565-570
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• 2009

Purpose: Numerous techniques have been introduced to reconstruct the perineal area in order to preserve function of both the recipient and the donor site while satisfying aesthetic results. There are several advantages of using the pudendal aretery perforator based flap in that it provides thin coverage of defect area and a relatively excellent circulation through perforators. The perineal region can be divided into two areas : the urogenital triangle and the anal triangle. Since each area differs in structure and function so does its reconstructive plan. The authors of this article report clinical results obtained from pudendal artery perforator based reconstructed cases according to each differrent triangles. Methods: A total of 15 patients who underwent perineal reconstruction were enrolled in our study between the year 2002 and 2006. There were 4 cases of vaginal cancer, 4 cases of extramammary Paget's disease, 1 case of rectovaginal fistula in females and 2 cases of Paget's disease and 4 cases of Fournier's gangrene in male cases. The follow up period was on average 6 month. In female, superfical pudendal artery perforator based local flap were used to reconstruct the urogenital triangle defects, while internal pudendal artery perfoator based local flaps were used to reconstruct the anal traingle defects. In males the gracilis myocutaneous flap and internal pudendal artery perforator based local flaps were used in reconstruction of the scrotum and perineal defect. Result: In females, there was 1 case of partial flap necorsis that employed the superficial pudendal artery perforator but secondary repair through the internal pudendal artery perforator based local flap was done. In addition, there were 4 wound dehiscence cases in females and 2 cases in males. Conclusion: We believe that a better aesthetic and functional outcome can be achieved in perineal reconstruction if discrete surgical planning is carried out systematically categorizing the choice of flap employed acccording to distinct anatomical regions : the urogenital and the anal triangle.