정점 응집맵을 이용한 지형 렌더링

조인우,이은석,신병석 한국게임학회 2011 한국게임학회 논문지 Vol.11 No.1

최근 지형렌더링에서 사용되는 DEM(digital elevation map) 데이터들은 일반 컴퓨터에서 처리 가능한 메모리 용량을 초과하기 때문에 밉맵(mipmap)을 이용한 상세단계(LOD : level-of-detail) 기법들을 사용하는 외부 메모리 처리(out-of-core) 기법들이 많이 연구되고 있다. 하지만 밉맵을 이용한 상세단계 기법들은 높은 레벨의 상세단계에서 데이터의 간략화에 따른 기하오차가 발생한다. 이러한 기하오차는 시점이 이동할 때 상세단계가 변화하는 부분에서 기하파핑(geometry popping) 현상을 유발한다. 본 논문에선 기하오차를 줄이기 위해 정점 응집맵을 제안한다. 전처리 단계에서 생성되는 정점 응집맵은 벡터를 저장한 텍스쳐이다. 이 벡터들은 상대적으로 기울기 변화량이 큰 위치로 주변의 정점들을 응집시켜 지형의 기하오차를 줄이기 때문에 단순히 밉맵을 이용하여 지형을 렌더링 했을 때 나타나는 기하파핑 현상을 효과적으로 줄일 수 있다. Recently in terrain rendeing, most researches introduce mipmap-based out-of-core methods for handling large sized DEM data which does not fit in main memory of general computer. However, mipmap-based LOD(level-of-detail) methods occur geometric errors which appear in data simplifying the higher LOD level. These geometric errors cause geometric popping effects where LOD level changes when viewpoint moves. In this paper, we propose vertex cohesion map for reducing geometric error. In preprocessing step, we generate vertex cohesion map, which is a texture that stores the vectors. By these vectors, each vertex will be cohered into the position in which the difference of gradient value is bigger than others. Therefore in terrain rendering, using vertex cohesion map can dramatically reduce the geometry popping effects rather than using mipmap.

자산관리 상수도분야 리스크 기반 서비스수준

조인우,이영재 대한상하수도학회 2015 상하수도학회지 Vol.29 No.3

The function failure of present major facilities is likely to lead to failure of related systems and/or whole facilities, increasing the necessity for protection of infrastructures, main structures, and major industrial facilities. In addition, safe and efficient management for urban infrastructure (waterworks and sewerage facilities, electricity, telecommunications, roads, etc) installed in the basement or on large cities grounds at various public areas is required. Recently in response to this demand, efforts for vitalizing asset management are being made such as enacting related laws and developing asset management system in the U.S., Australia, Europe and other advanced countries with the concept for a new maintenance. In our county, identifying maintenance system problems such as aging and rapid increasing of existing infrastructures and decision-making about updating maintenance is required for systematic and organizational maintenance. In this study, by comparing and observing the LOS(Level of Service) of each countries’ waterworks and risk-based LOS, we suggest the direction of future urban water infrastructure management systems for more effective management.

화학사고 대응을 위한 교육체계 기반연구

조인우,유병태,권동욱,이세용 한국공업화학회 2022 한국공업화학회 연구논문 초록집 Vol.2022 No.1

A comparison of different compressive forces on graft materials during alveolar ridge preservation

조인우,박정철,Hyun-Seung Shin 대한치주과학회 2017 Journal of Periodontal & Implant Science Vol.47 No.1

Purpose: Following tooth extraction, alveolar ridge preservation (ARP) can maintain the dimensions of ridge height and width. Although previous studies have demonstrated the effects of ARP, few if any studies have investigated the compressive force applied during grafting. The aim of this study was to determine the effects of different compressive forces on the graft materials during ARP. Methods: After tooth extraction, sockets were filled with deproteinized bovine bone mineral with 10% porcine collagen and covered by a resorbable collagen membrane in a double-layered fashion. The graft materials were compressed using a force of 5 N in the test group (n=12) and a force of 30 N in the control group (n=12). A hidden X suture was performed to secure the graft without primary closure. Cone-beam computed tomography (CBCT) was performed immediately after grafting and 4 months later, just before implant surgery. Tissue samples were retrieved using a trephine bur from the grafted sites during implant surgery for histologic and histomorphometric evaluations. Periotest values (PTVs) were measured to assess the initial stability of the dental implants. Results: Four patients dropped out from the control group and 20 patients finished the study. Both groups healed without any complications. The CBCT measurements showed that the ridge volume was comparably preserved vertically and horizontally in both groups (P>0.05). Histomorphometric analysis demonstrated that the ratio of new bone formation was significantly greater in the test group (P<0.05). The PTVs showed no significant differences between the 2 groups (P>0.05). Conclusions: The application of a greater compressive force on biomaterials during ARP significantly enhanced new bone formation while preserving the horizontal and vertical dimensions of the alveolar ridge. Further studies are required to identity the optimal compressive force for ARP.

Investigation of Efficacy of New Electrolyzed Water Generator for Oral Bacteria

조인우,남태계,백동헌 대한예방치과학회 2017 International Journal of Clinical Preventive Denti Vol.13 No.1

Objective: Electrolyzed water has antimicrobial activity against pathogenic bacteria. However, antimicrobial efficacy of electrolyzed water (EW) generator varies depending on the configuration and for of the electrodes. This study is to investigate antibacterial activity of new electrolyzed water generator against oral bacteria and biofilm. Methods: The EW was generated with eBio-cleaner, and the EW was treated on bacterial pellets after harvest of four oral bacteria. The EW treated bacteria were spread on agar plate and incubated at 37°C in anaerobic condition. Next, the salivary biofilm was formed using pooled saliva from the healthy donor. The salivary biofilm was treated with tap water, the EW and listerine, and the biofilm bacteria were spread on agar plate and were observed confocal laser microscope after live/dead staining. Results: The EW generated by eBio-cleaner has bactericidal activity against planktonic Aggregatibacter actinomycetemcomitans, Fusobacterium nucleatum, Porphyromonas gingivalis, and Streptococcus mutans. Listerine showed the strongest antimicrobial activity against planktonic bacteria. In case of biofilm experiment, the EW generated by eBio-cleaner showed disruptive and antimicrobial effect on the salivary biofilm. Whereas, listerine exhibited antimicrobial effect on the outside of biofilm. Conclusion: Take together of the results, the EW generated by eBio-cleaner may be helpful in preventing and treating dental caries and periodontitis by oral bacteria.

연구논문 구연발표 : 상악 전치부 임플란트 이차 수술시 다양한 수술법과 임시 수복물을 활용한 주위 연조직 처치

조인우,홍기석,임성빈,정진형 대한치주과학회 2006 대한치주과학회 학술대회자료집 Vol.2006 No.2

기업경영의 조직과 과학적인 관리

趙寅宇 건국대학교 1969 理工學報 Vol.1969 No.2

Studies on People Who Work in the Field of Dentistry’s Awareness of Health Insurance Coverage for Smoking Cessation Treatment in Dentistry

조인우 대한예방치과학회 2016 International Journal of Clinical Preventive Denti Vol.12 No.1

Objective: Even though smoking cessation treatment in dental clinic can be covered by national health insurance in this year, people who work in the field of dentistry’s awareness and educational preparation seems insufficient. The aim of this study is to evaluate the awareness of dentists and other dental workers on the health insurance coverage for smoking cessation treatment in dentistry. Methods: The survey was carried out on 100 people in Dankook University Dental Hospital. And the questionnaire consists of 21 items. Results: The results show that many of people who work in the dental field expect positive effects of the treatment, but most of the respondents were not aware of the initiation of health insurance coverage smoking cessation treatment, and they did not have correct information about smoking cessation counseling and prescription. Conclusion: In conclusion, the government and ministry of health welfare should pay more attention to the promotion of the smoking cessation treatment in dentistry by proper advertising and educational courses.

변형된 Edlan-Mejchar 술식을 이용한 임플란트 주위 전정성형술의 기술적 측면에 대한 보고

조인우,강대영,신승일,신현승,박정철 대한구강악안면임플란트학회 2019 대한구강악안면임프란트학회지 Vol.23 No.4

Vestibuloplasty is usually considered for improving retention and/or stability of denture by deepening vestibule and providing attached gingiva. The current case series aimed to describe the technical aspect of modified Edlan-Mejchar vestibuloplasty for improving the soft tissue environment around dental implants. The technique was applied to 3 patients who had a lack of vestibule and keratinized peri-implant mucosa. A U-shape incision that opens toward the implant prosthesis was performed 1 mm deep into the mucosa. It comprises of 2 vertical incisions that start 3 mm apical point from the buccal and proximal side of the implant and 1 horizontal incision that roundly connects the apical ends of the vertical incisions. Split-thickness flap was reflected on the mucosal area surrounded by the U-shape incision in the coronal direction. Another horizontal incision was performed under the flap into the periosteum along the imaginary line with the coronal edge of the U-shape. An underlying mucoperiosteal flap was reflected with dull instrument and apically positioned so that the superficial split-thickness flap could be placed on the denuded bone surface. The surgical wound was stabilized by suturing, gauze pressing, or periodontal dressing. The deepened vestibule and newly formed attached mucosa around implants were maintained in all patients during the follow-up period ranging from 3 to 9 months. The vestibular deepening with attached mucosa might be simply obtained using the technique in selected indications. However, further studies are warranted to investigate the long-term stability and histologic feature of the newly formed attached mucosa.

도로터널시설 위험평가 모델링을 위한 방법론 연구

조인우(Cho, Inuh),한대용(Han, Dae-yong),김승진(Kim, Seung-jin),윤종구(Yoon, Jong-ku) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.4

지하 수송에 대한 수요가 증가함에 따라 도로터널 사용자와 운영자는 다양한 원인에 의한 위험에 노출되어 있으며, 주요 원인은 각각 사고 이벤트가 될 수 있는 교통상황이다. QRA(정량적 위험평가)의 중요성은 도로터널의 안전성을 정량화 하고, 다수의 이해관계자들의 관점(용량, 신뢰성, 가용성, 유지보수 및 안전)에서의 요구조건에 밸런스를 유지하려는 의도에 서 커지기 시작했다. 위험평가에 사용되는 고전적 방법은 ETA, FTA이지만, 변수의 다양함과 상호관계를 반영하지 못한다는 이유에서 이 방법들은 상대적으로 단순한 경우에만 적용할 수 있다. 특정위험평가에 필요한 객체, 이벤트, 결과 및 가정, 경계 조건 등의 총체는 도로 터널시설 위험평가를 위해 필수적인 내용으로 관찰되어야 하는 시스템을 만들고, 정보, 데이터, 모델 등 관련 항목들이 그 시스템을 서술하게 된다. 시스템은 위험모델에 기반한 계층적 지표들을 사용하여 모델링되고 분석되며, 시스템의 모든 가능한 구성은 지표의 적절한 선택을 통하여 표현될 수 있다. 따라서 본 연구에서는 일반터널에서뿐만 아니라 복층터널 같은 복합적인 지하시스템 변수들간의 상호의존성을 고려하여 정량화할 수 있는 베이지안 네트워크를 근거로 한 정량적 위험평가방법을 소개한다. The demand for subsurface transport is increasing. The users and the operators of road tunnels are exposed to risks with different causes. One main cause, however, is the traffic situation in the event of accidents. The importance of a Quantified Risk Assessment is increasing to quantify the safety of road tunnels and to balance the requirements (capacity, reliability, availability, maintainability and safety) of various stakeholders. Although there are classical methods for risk assessments, such as ETA and FTA. These methods are used for relatively simple cases because it could not relevantly reflect the diversity and relationship of the parameters. Therefore, a quantitative risk assessment based on Bayesian Probabilistic Networks considering interdependence between the parameters of a complex underground system as a double deck tunnel is provided.