• Journal of Ceramic Processing Research
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• 제13권spc2호
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• pp.198-201
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• 2012

The electrolytes in thermal batteries are nonconductive solids at ambient temperature, which prevent the self-discharge and corrosion. To meet severe environmental requirements and guarantee acceptable handling yields, all the pellets in cells should have adequate strength, especially for the cathodes due to their poor binding properties among FeS2 particles. By modifying the surface microstructure of FeS2 through molten-salt heat treatment, the inter-particle binding strength is greatly increased, resulting in the enhanced pellet strength and yield. The addition of Li2O also promoted the soft salt coating coverage of hard FeS2 particles, which can be explained by the enhanced wettability of the molten salt.

• 한국항해항만학회지
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• 제42권3호
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• pp.207-216
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• 2018

컨테이너 터미널에서 한정된 공간에서 공 컨테이너를 선사별, 컨테이너 종류별로 구분하지 않고 혼적하여 보관하면 장치공간은 효율적으로 활용할 수 있지만 재취급이 증가하는 문제가 발생한다. 본 연구에서는 여러 가지 보관 전략에 따른 장치장에 공 컨테이너가 섞여 있는 상태와 반출 작업에 사용하는 야드 장비에 따라 재취급의 기대 횟수를 추정하는 수식을 유도하고 수치실험을 통하여 비교하였다. 인출비율과 수리비율 변화에 따른 기대 재취급 횟수 변화도 분석하였다. 그리고 장치 규모 변화에 따른 기대 재취급 횟수를 비교하고, 복수 선박의 컨테이너가 혼재된 상태에서 장치비율 및 인출비율 변화에 따른 기대 재취급 횟수를 분석하였다. 공 컨테이너 대상 기대 재취급 횟수를 고려한 효율적인 운영전략에 대한 연구가 필요하다.

• 한국안광학회지
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• 제5권1호
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• pp.187-192
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• 2000

소프트 콘택트렌즈를 착용하고 있는 한국인 여대생을 대상으로 이들의 소프트 콘택트 렌즈 학용에 관련된 각종 문제점을 비교분석한 것이다. 본 연구의 결과는 다음과 같다. 1. 대부분 소프트렌즈의 구입은 안경원이다. 2. 대부분 소프트 콘택트렌즈 착용의 동기는 안경 사용의 불편함이다. 3. 대게 렌즈 사용의 만족도는 중등도이다. 4. 렌즈 교체의 주요 원인에 대해서 10대는 렌즈의 손상이며 20대는 사용기간의 만기이다. 5. 하루 중 렌즈 사용의 기간에 대해서 10대는 10시간 이상이며, 20대는 7시간에서 10시간 사이이다. 6. 콘택트 렌즈 관리와 처방의 어려움에 대해서는 10대는 세척과 저장을, 20대는 세척과 소독이다. 7. 렌즈 취급의 주요 어려움에 대해서 10대는 렌즈 제거와 렌즈 케이스 소독을, 20대는 관리용액의 취급과 렌즈의 삽입이다. 8. 렌즈의 삽입중 가장 어려운 사항에 대해서 10대는 눈에 렌즈의 걸림과 두려운 감정이, 20대는 두려운 감정이다. 9. 렌즈 제거시 어려움에 대해서는 눈의 개안 유지가 대부분이다. 10. 렌즈 착용중 가장 불편한 사항은 충혈, 이물감, 동통 등이다. 11. 렌즈 착용의 장점에서 10대는 주로 안경 불편함이며, 20대는 미용이다.

• Journal of Periodontal and Implant Science
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• 제37권3호
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• pp.637-646
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• 2007

Implants placed immediately after tooth extraction have been shown to be a successfully predictable treatment modality. Several clinical papers suggest that placing implants immediately after tooth extraction may provide some advantages: reduction of the number of surgical procedures or patient visits, preservation of the dimensions of alveolar ridge, and shortening of the interval between the removal of the tooth and the insertion of the implant supported restoration. In this case report, three patients received single immediate implant placements to replace a maxillary anterior tooth at the time of extraction. As the three cases were somewhat different, treatment protocols had to be modified as follows: Case 1. Immediate implant placement with healing abutment connection. Case 2. Immediate implant placement with immediate provisionalization. Case 3. Immediate implant placement with Guided Bone Regeneration(GBR). Every implant of these cases was placed in proper position buccolingually, mesiodistally and apicocoronally, The procedures following implantation such as immediate provisionalization and GBR were free of problem. Healing of each case was uneventful. In all cases, treatment outcomes were mostly satisfactory and the results maintained during follow-up periods. However, one case (Case 3) showed some papilla loss due to failure in delicate soft tissue handling during surgery. This papilla loss was compromised by prosthetic means. In conclusion, immediate implant placement in the fresh extraction socket can be a valid and successful option of treatment in aesthetic area. Moreover, this treatment protocol seems to maintain the preexisting architecture of soft and hard tissues in most cases.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제18권2호
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• pp.177-183
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• 1996

With the increasing esthetic requirement in orthognathic surgeries, midfacial corrective surgeries were developed to improve the paranasal depression. Augmentation with autogenous bones has long been the standard in facial reconstruction, however limited graft availability, donor site morbidity, and difficulties in 3-dimensional shaping were led to limited use. Porous high density polyethylene$(Medpor{(R)})$ was introduced in the 1970s as an alloplastic implants. It can be used in various size and shapes, and shortend operation time. The purpose of this study is to determine, by means of cephalometrics, the degree of long term stability and gaining of the overlying soft tissue thickness. The results were as followings : 1. There was no evidence of foreign body reaction, infection, and tissue necrosis. 2. $(Medpor{(R)})$ implants had an advantage of clinical use ; easy to contour and adapt to obtain a precise 3-dimensional construction. 3. Cephalometric study of 16 cases of paranasal augmentation revealed an overall increase of soft tissue thickness of approximately 82.1% in 6-months following. 4. The successful results could be obtained under the aseptic handling.

• Journal of Korean Dental Science
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• 제7권1호
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• pp.38-42
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• 2014

Bisphosphonate-related osteonecrosis of the jaw (BRONJ) is defined as exposed necrotic bone without evidence of healing for at least 8 weeks in the maxillofacial area in a patient with history of bisphosphonate use. Obtaining complete coverage of the hard tissue by soft tissue in BRONJ patients is especially important. Therefore, managing the mucosa is one of the key factors in a successful outcome, but this is especially hard to achieve in BRONJ patients. Various applications of buccal fat pad in oral reconstruction-including the closure of surgical defects following tumor excision, repair of surgical defects following the excision of leukoplakia and submucous fibrosis, closure of primary and secondary palatal clefts, coverage of maxillary and mandibular bone grafts, and lining of sinus surface of maxillary sinus bone graft in sinus lift procedures for maxillary augmentation-have been studied. Eliminating all potential sites of infection and post-operative infection control is crucial in BRONJ. We present a case using the buccal fat pad pedicle for a stage 3 BRONJ defect. Uneventful total epithelialization of the buccal fat pad regardless of size was noted. In summary, the buccal fat pad has versatile application and various recipient sites for surgical utilization. It is an easy technique, with promising overall success rates. With careful selection and handling, buccal fat graft can resolve problems with soft tissue coverage in stage 2 or 3 BRONJ patients.

• 구강회복응용과학지
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• 제23권4호
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• pp.303-312
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• 2007

Recently several studies have been developed not only to apply bone materials to bony defect, but also to use osteogenic and osteoinductive materials to form bone more effectively. In 1998 Mark et al applied gel formation of PRP(platelet-rich plasma) in bony transplantation for mandibular reconstruction as one of the method of stimulating bone formation in maxillofacial area, which is contain of varies growth factors. After he reported that PRP accelerate bone formation, which is used in varies bone transplantation and augmentation with a good result. Especially there are amount of growth factors in PRP, and PRP increase angiogenesis, cell division, and mesenchymal cell growth. Moreover it is capable of osteoconduction, hemostatitis, anti-infection, forming the shape at transplantation, ease of handling, and recipient site stability. So it is known that success rate is high in bone transplantation. However PRP need tissue adhesive to make plasma to solid form. Thrombin and calcium chloride, component of PRP, is extracted from autogenic donor. So it is expensive to extract and there is possibility of hepatitis, AIDS, and hematogenous metastasis. After all, tissue adhesive have the limitation and danger of use. So we are willing to introduce that we had get some idea after using PRF(platelet-rich fibrin) in the various hard and soft tissue bony defect, which is self extracted simply and contain growth factors.

• Clinics in Shoulder and Elbow
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• 제20권4호
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• pp.236-239
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• 2017

After dual plating with a locking compression plate for comminuted intraarticular fractures of the distal humerus, the incidence of ulnar nerve injury after surgery has been reported to be up to 38%. This can be reduced by an anterior transposition of the ulnar nerve but some surgeons believe that extensive handling of the nerve with transposition can increase the risk of an ulnar nerve dysfunction. This paper reports ulnar nerve injuries caused by the incomplete insertion of a screw head in dual plating without an anterior ulnar nerve transposition for AO/OTA type C2 distal humerus fractures. When an anatomical locking plate is applied to a distal humeral fracture, locking screws around the ulnar nerve should be inserted fully without protrusion of the screw because an incompletely inserted screw can cause irritation or injury to the ulnar nerve because the screw head in the locking system usually has a slightly sharp edge because screw head has threads. If the change in insertion angle and resulting protruded head of the screw are unavoidable for firm fixation of fracture, the anterior transposition of the ulnar nerve is recommended over a soft tissue shield.

• Journal of Mechanical Science and Technology
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• 제19권2호
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• pp.520-528
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• 2005

In this study, a new mathematical dynamic model of displacement sensitive shock absorber (DSSA) is proposed to predict the dynamic characteristics of automotive shock absorber. The performance of shock absorber is directly related to the vehicle behaviors and performance, both for handling and ride comfort. The proposed model of the DSSA has two modes of damping force (i.e. soft and hard) according to the position of piston. In this paper, the performance of the DSSA is analyzed by considering the transient zone for more exact dynamic characteristics. For the mathematical modeling of DSSA, flow continuity equations at the compression and rebound chamber are formulated. And the flow equations at the compression and rebound stroke are formulated, respectively. Also, the flow analysis at the reservoir chamber is carried out. Accordingly, the damping force of the shock absorber is determined by the forces acting on the both side of piston. The analytic result of damping force characteristics are compared with the experimental results to prove the effectiveness. Especially, the effects of displacement sensitive orifice area and the effects of displacement sensitive orifice length on the damping force are observed, respectively. The results reported herein will provide a better understanding of the shock absorber.

• 융합보안논문지
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• 제15권1호
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• pp.69-82
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• 2015

고도화되고 지능화가 예상되는 사이버 침해대응에 대해 효율적으로 대응키 위해서는 악성코드의 공격에 대해 기존 방어적 대응형태에서 공격적 전환개념이 요구되기에 이러한 환경을 근간으로 연구한 결과 기존의 OS, APPLICATION SYSTEM 등의 각 영역별 SINGLE-MODE 체계의 구조대비 Real-time에 의한 공통 전수 취약점 탐지 분석 개념으로 다단계기반의 탐지 및 분석개념(MPSM)을 연구하였다. 동시에 필요시 해당 정보자산과 직접적인 단독접속형태의 취약점 탐지 및 분석을 위해 API 기반의 전용하드웨어 플랫폼형태의 방안이 요구되어 짐과 동시에 이를 위해서는 H/W 및 S/W의 분리된 현재와 같은 2중화된 형태가 아닌 일체형의 H/W 타입의 플랫폼구조 기반 형태로 설계됨과 동시에 병행되어 빅데이타 분석에 의한 정보보안의 포렌직 측면을 고려할 시 항시 모니터링 되고 관리할 수 있는 구조로 연동 설계 등에 대해 제안하였다.