[논문]보양조건 및 타설주기를 고려한 매스 콘크리트 구조물의 수화열 해석

이영호,서기영,최덕락,엄장섭,진치섭* 釜山大學校生産技術硏究所 2004 生産技術硏究所論文集 Vol.63 No.-

콘크리트 구조물의 공용수명은 콘크리트 재료의 초기에 발생하는 수화열에 의해 아주 큰 영향을 받는다. 수화열은 콘크리트의 열전달 및 열응력 특성으로 결정되어지는 온도균열지수를 통해 분석되고 있다. 본 연구에서는 이러한 온도균열 지수의 분석을 통해 매스 콘크리트 구조물의 시공시 적절한 시벤트 종류, 보양방법,타설주기 및 타설높이 둥 최적의 시공방안 구하는데 도움을 주어 향후 시공 예정인 매스 콘크리트 구조물에 발생 가능한 온도균열을 미리 예측하여 이를 방지하기 위한 시공 방안을 제안하는데 그 목적을 두고 있다.

Modified Free Wrap-around flap을 이용한 수무지 재건술

최영화,황치원,정병훈,한명호 대한성형외과학회 1992 Archives of Plastic Surgery Vol.19 No.3

The thumb is the most important part in the hand and its loss results in severely diminished function of the hand for pinch and grasp. There are several microsurgical and other methods to reconstruct and amputated or lost thumb such as toe-to-thumb transfer1)2)9) as well as several varieties of flaps. Among them, a free wrap around flap taken from the big toe, including the nail and an iliac bone graft as the cone of the reconstruction was a quite satisfactory procedure, but there were some problems. We performed a free wrap around flap on traumatically missing thumb with modification to include all part of the distal phalanx without iliac bone graft. The resorption and atrophy of a grafted iliac bone, a constant problem with Morrison's original procedure8), could be prevented by the modified method. The donor site defects were covered by remained medial flap for weight bearing area first, and full thickness skin graft for remained defected area. The results were good cosmetically and functionally without significant problems.

설계 자동화를 위한 하드웨어 할당 알고리듬

최지영,인치호 世明大學校 1998 世明論叢 Vol.7 No.-

This thesis proposes a new hardware allocation algorithm for design automation. The proposed algorithm works on scheduled input graph and simultaneously allocates binds functional units, interconnections and registers by considering interdependency between operations and storage elements in each control step, in order to share registers and interconnections connected to functional units, as much as possible. This thesis shows the effectiveness of the algorithm by comparing the results of our experiments with those of exiting system.

Glycol Oleates의 합성과 절삭유제로서의 물성

최형기,이호식,이치우,강신춘,노시태 한양대학교 공학기술연구소 1993 공학기술논문집 Vol.2 No.1

Glycololeates for the application of cutting fluid were synthesized from oleic acid and glycols such as ethylene glycol, diethylene glycol and triethylene glycol. The ratio of glycol-monooleate and dioleate in product according to the reaction condition was analyzed by TLC, CC and HPLC. Properties of glycololeates as cutting fluid were examined by various testing methods such as profile test, pH test, anti-foaming test friction coefficient test and emulsion stability test to compare those of base oil and cutting fluid trading in the market. Non-catalytic reaction of glycololeates synthesis was showed too low conversion rate, but too fast conversion rate and deep color deterioration of products was obtained with acid-catalyses reaction. Using the SnCl2 catalyst, conversion rate was medium range and products which suitable for the application of cutting fluid with mild colored and with desirable mono- and di-oleate composition was obtained. Cutting fluidal properties of glycololeates with SnCl2 catalyst were better than those of base oil, and were similar level to those of cutting fluid containing various additives.

가막만에 분포하는 대형저서동물의 계절적 분포 및 출현

최상덕,문성용,안치영,윤호섭,정형택,이삼노,서호영 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-

This study was coducted to describe the distribution and appearance pattern of macrobenthos in Kamak Bay, the southern coastal of Korea. Sampling was perfound seasonally using Van Veen grab(0.1㎡) from April 2001 to December 2001. A total of 22 macrobenthic species occured: Bivalvia accounted for 12 species(55%), and Mollusca 5 species(23%). The mean density of macrobenthos was 153.9ind./㎡, a major dominant species were a Bivalvia, Paphia undulata(28.3ind./㎡), and a Cirripedia, Chthamalus challengeri(5ind./㎡), which frequency occur in the costral area. These species showed very low density at station 1 in the Kamak Bay.

소음·진동에 따른 참전복(Haliotis dissus hannai)의 행동·생태학적 변화

최상덕,정형택,윤호섭,안치영,이삼노,이우범 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-

These days, the underwater excavation and the piling work have been commonly used to reclaim land and to build a breakwater. As the piling work generates high underwater sound pressure in all direction, various kinds of marine organisms are largely affected even if they live a long distance from the piling work. Therefore, this paper describes the relationship between the behavior of abalone(Haliotis discus hannai) of 50cm long and the environmental noise level with vibration due to the piling work. We have separated the research into two parts. The one is continuance impact, the other is intermittent impact. The following are the results obtained from the present investigation: Comparing 0.5cm/sec vibration with 50dB noise and 0.9cm/sec vibration with 60dB, the previous one show a faster reaction speed than the later one. Futhermore the later one showed that pulling up on their shell, in order to avoid the epidemic, moving around, small organisms are included to hide under big organisms, alerting posture. However we couldn't find a consistent standard in our research.

투명전도막 Cadmium Stannate의 특성에 관한 연구

최치규,김건호 濟州大學校 師範大學 科學敎育硏究所 1985 科學敎育 Vol.2 No.-

CTO(Cadmium Stannate Oxide) thin film were deposited onto borosilicate glass by chemical spray pyrolysis. The structure of the film had been identified as polycrystalline Cd_(2), SnO_(4), having(l30) (310) (321) (041) and (341) planes. The transmittanced of the films was more than 90% in visible range and the films reflect almost all of the infrared spectra beyond 2.8um . The refractive index of this film was 1.8 at 6,000Å and 2.2 at 5,l00Å. And the optical band gap were 2.85eV. Through annealing in Argon ambient the sheet resistance of the CTO films were lowed.

콘크리트 構造物의 混合모드 龜裂傳播모델 (第 2 報)

진치섭,최희진,이영호 釜山大學校生産技術硏究所 1996 生産技術硏究所論文集 Vol.51 No.-

본 연구의 목적은 유한요소법을 이용하여 노치가 있는 콘크리트보에서 혼합모드 균열전파경로를 추적할 수 있는 프로그램을 개발하는 것이다. 본 연구에서는 원주에서는 원방향 최대 인장응력이론을 이용하여 균열선단에서 균열의 전파각을 구하고 균열의 안정성을 판단하는 방법으로, 노치가 있는 콘크리트보에서 균열전파경로를 추적하여 Jenq 와 Shah의 실험 결과와 비교하였다. A series of numerical analyses were performed on mixed mode crack propagation in concrete. The conventional quadratic isoparametric elements were used in all region except the crack tip zone where triangular singularity elements with 6 nodes were used. The stress intensity factor of mode Ⅰ and Ⅱ, KⅠ, KⅡ respectively, were determined by the displacement correlation method. The finite element analysis program was followed by the maximum circumferential tensile stress criteria. This allowed us to determine the crack propagation trajectories, the final crack angles and the peak loads in a varying mixed mode stress field. The values were compared with those by Jenq and Shah's experiments of the same geometry and material properties. The results were very close to those of the Jenq and Shah's experiments. Crack path and peak load for mixed mode failure in massive concrete structures like a dam can be evaluated by this program.

전산화 단층촬영술을 이용한 악하선 타석증의 진단

구치균,이종갑,이제호,최형준 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.3

Sialolithiasis is the formation of calcareous concretions within ductal system of a major or minor salivary gland. They are formed by deposition of calcium salts around a central nidus which may consist of desquamated epithelial cells, bacteria, foreign bodies, or products of bacterial decomposition. An ll-year-old boy complained of pain during meals and intermittent mild swelling in the right submandibular region. Although it was not detected in true occlusal radiograph. panoramic radiograph showed a round radiopaque mass 3mm in diameter. Computed tomography (CT) was taken for locating the stone and 3-dimensional reconstruction was per-formed . Under general anesthesia, sialoadenectomy was done through extraoral approach. diagnosis of submandibular sialolithiasis using high-resolution CT with reconstructions was helpful for surgical decisions, namely radical removal of the submandibular gland and its duct.

Type Ⅱ 상아질형성부전증의 임상 증례 : CASE REPORT

김지현,이제호,최병재,이종갑 大韓小兒齒科學會 2001 大韓小兒齒科學會誌 Vol.28 No.4

상아질형성부전증은 유전적인 상아질의 결함으로 치아 발육과정 중 조직분화기에 발생되며 유치와 영구치 모두에서 나타난다. Shields 등은 상아질형성부전증을 type Ⅰ, Ⅱ, Ⅲ로 분류하였으며, Witkop에 따르면 1/8000 명의 빈도로 이러한 유전적 소인을 갖게 되며, 남녀간의 차이는 뚜렷하지 않다고 한다. 이환받은 치아는 적갈색의 변색과 함께 심한 마모현상으로 인해 구치부 교합면과 전치의 절단면의 법랑질이 파괴되고 그후 급속도로 상아질의 파괴가 뒤따른다. 방사선학적으로 가느다란 치근과 구근상치관, 치경부 협착, 작거나 결손된 치수강이 관찰되고, 유치열에서 치근단병소나 다발성 치근파절이 관찰되기도 한다. 본 증레의 4세 남자환아는 치아색이 이상하다는 것을 주소로 연세대학교 치과병원 소아치과에 내원하였다. 치아는 전반적으로 황갈색의 변색과 중등도의 마모도를 보였으며, 방사선 검사 소견에서 치아의 치수강 폐쇄, 구근상치관, 짧은 치근들이 관찰되었다. 가족력상 각 세대마다 환아와 같은 치아변색과 마모의 유전양상이 관찰되었으며, 10세된 환아의 누나는 영구치열에 전체적으로 회갈색의 변색과 경도의 마모도를 보였다. 임상 및, 방사선학적 검사소견상 상아질형성부전증으로 판단되어 환아의 손상된 치아에 대해 구치부는 기성금관 수복을, open-faced stainless steel crown으로 치근파절로 인해 발거된 상악 좌측 유중절치를 포함한 손상된 전치부를 수복해 기능적, 심미적으로 만족할 만한 결과를 얻어 이에 보고를 하는 바이다. Dentinogenesis imperfacta is an example of an inheritable dentinal defect originating during the histodifferentiation stage of tooth development, wit involvement of the primary and permanent teeth. Shields, Bixler and EI-Kafrawy proposed three types of Dentinogenesis imperfecta : Type Ⅰ, Ⅱ, Ⅲ. Witkop reported a prevalence of 1 in 8000 with the trait, and no significant difference between male and female. Affected teeth have red-brown discoloration often wit distinctive wearness of occlusal surface of posterior teeth and incisal surface of anterior teeth. Once enamel seperated from underlying defective dentin, the dentin demonstrates significantly acclerated attrision. Radiographically, the teeth have thin roots, bulbous crown, cervical constriction, and obliteration of the root canals and pulp chambers. In primary dentition periapical lesions or multiple root fractures are often observed. In successive generations the phenotypes of discoloration and wearness of teeth occurred, and one of the patient's subships, 10 year-old siste, showed general discoloration of her teeth and mild wearness. In this case, a 4 year-old male reported to the Yonsei University Pedodontics clinic, with a chief complaint of discolored teeth. The teeth showed generally yellowish-brown discoloration and moderate wearness. In radiographic features, obliteration of pulp, bulbous crown, and short roots were observed. It was diagnosed as Dentinogenesis imperfecta. The posterior teeth were resotred with Stainless Steel Crown, and defective incisors including left upper primary central incisor which was extracted due to a root fracture wit Open-faced Stainless Steel crown.