세라믹필터 역세정에 노즐 및 디퓨저 형상이 미치는 영향

김학빈,정재화,조형희 연세대학교 산업기술연구소 2001 논문집 Vol.33 No.1

The present study has been conducted experimentally to optimize the nozzle and diffuser shapes and diameters for dust removal system. Investigation of a dust removal system has been carried out to develop hot gas clean-up technology and to study for feasibility of clean coal technology pilot plant construction. Experiments was conducted to investigate the effects of pulse nozz1e and diffuser shapes on the air entrainments and on the pressure distribution in a particulate removal system. The main experimental parameters are different nozz1e shapes, nozzle diameters and nozzle tip positions from the diffuser upper plane. Especially, two different types of diffusers with a convergent-divergent shape and a divergent shape were tested systematically. Key words : IGCC(석탄가스화 복합발전), Ceramic Candle Filter(세라믹 캔들 필터), Reverse Cleaning(역세정). Nozz1e(노즐), Diffuser(디퓨저), Entrainment Ratio(동반류비)

경골 골수정 고정술후 교합나사의 파단

박형빈,강번중,송해룡,구경회,정순택,조세현 대한골절학회 2002 대한골절학회지 Vol.15 No.4

목 적 : 경골 골절에서 골수정 고정술후 발생하는 교합나사 파단의 빈도와 발생 원인을 밝히고자한다. 대상 및 방법 : 1995년 3월부터 2000년 10월까지 골수정으로 치료하였던 경골 간부골절 82예중 내고정물 파단이 발생하거나 골유합이 이루질 때까지 추시 가능하였던 75예를 대상으로 하였다. 내고정물 파단 빈도와 위치, 골절의 양상, 술후 골절부 신연 및 골유합 이상 여부를 조사하였다. 결 과 : 교합나사 파단은 7예였고 (9.3%), 근위부 두 번째 나사의 파단이 가장 흔하였다. 교합나사으 ㅣ파단은 AO분류 B형과 C형 골절, 술후 골절부가 신연된 경우, 개발성골절, 자연유합 및 불유합의 경우 발생하였다. 결 론 : 교합나사 파단의 주된 요인은 골절부의 골과 골 접촉이 불안정하기 때문이며, 개방성 골절, 지연유합 및 불유합도 교합나사 파단의 위험인자라고 생각한다. 교합나사 파단을 예방하기 위해서는 수술시 골절부 신연을 피해야하며 골절부 골접촉이 불안정한 경우 완전 체중부하를 골유합시까지 제한하여야할 것으로 생각한다. Purpose : The aims of this study were to investigate the prevalence and the causes of crew breakage in tibia nailing. Materials and Methods : Between 1995 and 2000, eighty-two tibial diaphyseal fracture were treated with interlocking nails. The loss of follow-up was 7 cases. We retrospectively reviewed seventy-five cases. We investigated the rate and location of metal failure and evaluated the fracture pattern, the presence of distraction after nailing and union abnormality. Results : Screw breakage was identified in seven cases (9.3%) and most frequently occurred on the second proximal locking screw. Screw breakage occurred in AO type B or C type fractures, fracture site distraction after nailing, open fracture, delayed union and nonunion. Conclusion : The main cause of screw breakage is unstable bone to bone contact on the fracture site caused by comminution of distraction. The open fracture, delayed union, and nonunion also contributing factors for screw breakage. For preventing screw breakage, it is necessary to avoid fracture site distraction and delay full weight bearing in cases having unstable fracture site contact.

전국대학의 수학과(전공)교과과정에 관한 비교연구

박형빈 木浦大學校 基礎科學硏究所 2003 基礎科學硏究誌 Vol.21 No.-

전국 88개 대학의 수학관련학과(전공)의 소속대학 또는 학부 명칭들을 분류하여 특징과 변화 추세등을 분석하였으며, 학과의 명칭들도 비교하여 분석하였다. 수학과와 응용수학과의 교과과정을 조사하여 교과과정을 구성하는 교과목수, 설강교과목의 빈도수 등을 조사비교하여 교과과정의 변화추세 등을 알아본다. 이러한 모든 결과를 토대로 하여 순수수학과(전공)와 응용수학과(전공)의 교과과정 모델을 개발하여 각 대학에서 참고할 수 있게 하며 수학전공자나 교수요원 인력양성 분야에도 이용할 수 있다.

흡연자와 비흡연자의 타액에서 코티닌 정량 및 ETS 노출량 평가

임흥빈,강영국,손형옥,이영구,문자영,이동욱 충북대학교 엽연초연구소 2001 煙草硏究 Vol.18 No.-

This study was conducted to measure and compare the salivary cotinine concentration between smokers and nonsmokers, and to investigate the effect on the exposure to environmental tobacco smoke(ETS) with housewives, living on an apartment of Korea. Saliva samples were taken from all volunteers and salivary cotinine was analyzed by a developed radioimmunoassay(RIA) method. The median salivary cotinine levels were 52.8±12.6 ng/ml and 44.6± 9.7 ng/ml in male smokers and in female ones, respectively, and they were 4.3±2.1 ng/ml and 2.9±3.1 ng/ml in male nonsmokers and in female ones, respectively. In addition, average salivary cotinine levels were 3.8±2.7 ng/ml in housewives from smoking homes and 2.4±2.4ng/ml in ones from nonsmoking homes. Results obtained from the analysis of salivary cotinine demonstrate that smokers had a significantly higher concentration of salivary cotinine than nonsmoker. But, there was no significant difference in the salivary cotinine concentration for housewives living in apartment between with smoking husband and with nonsmoking husband.

간척지 호소군의 동물플랑크톤 군집 비교

유형빈,김광수 원광대학교 환경과학연구소 1998 環境科學硏究誌 Vol.7 No.1

분산중합을 이용한 Poly(MMA-co-2-HEMA)의 고 고분자량의 합성 및 특성 연구

임수빈,현수용,한병학,김형중 公州大學校 工學硏究院 生産技術硏究所 2004 論文集 Vol.12 No.-

Poly[methyl methacrylate(MMA)-co-2-hydroxyethyl methacrylate(2-HEMA)] particles were synthesized by dispersion polymerization in a cyclic hydrocarbon medium. The reactions were carried out at 72~80℃ in the presence of SIS block copolymer and t-butyl peroxy-2-ethyl hexanoate, as steric stabilizer and initiator, respectively. The used cyclic hydrocarbon medium were cyclohexane and methyl cyclohexane. The resulting poly(MMA/2-HEMA) latexes were found to be monodisperse particle diameter of 2~3㎛. Dispersion polymerization of poly(MMA/2-HEMA) were carried out to investigate the effect of concentration of initiator. The molecular weight of poly(MMA/2-HEMA) in presence of methyl cyclohexane than cyclohexane was increased.

울릉도 지역주민의 휴양영향지각 분석

송형섭,김세빈,오도교 충남대학교 농업과학연구소 2005 농업과학연구 Vol.32 No.1

The purpose of this study were to understand the resident's attitudes toward Ulleung Island and to identify the residents' perception of recreation and the influence of socioeconomic characteristics on their response. In summer of 1999, 222 questioners were obtained from a convenience sample of households within Ulleung Island. The residents perceived both positive and negative environ-recreation and economic impacts, most of the residents supported additional recreation development and disagreed to limit the number of visitors. Their perception of recreation impacts were varied with age, education level, economic dependency on recreation place of residence, and length of residence.

성견 2급 치근이개부 병변 치료 시 이종골 이식 및 혈소판 농축 혈장의 골재생에 관한 효과

임성빈,신형식 원광대학교 생체재료·매식연구소 1999 원광생체재료·매식 Vol.8 No.1

New techniques for regenerating the destructed periodontal tissue have been studied for many years. Current acceptable methods of promoting periodontal regeneration are basis of removal of diseased soft tissue, root treatment, guided tissue regeneration, graft materials, and biological mediators. Platelet Rich plasma has been reported as a biological mediator which regulates activities of wound healing progress including cell proliferation , migration, and metabolism. The purpose of this study is to evaluate the effects of using the Platelet Rich plasma as a regeneration promoting agent for furcation involvement defect. Five adult beagle were used in this experiment. The dogs were anesthetized with Ketamin HCl (0.1 ml/kg, IV) and Xylazine hydrochloride (Rompun^ⓡ, Bayer, 0.1 ml/kg, IM) and conventional periodontal prophylaxis were performed with ultrasonic scaler and hand instruments. With inrasulcular and crestal incision, mucoperiosteal flap was elevated. Following decortication with 1/2 high speed round bur, degree Ⅱ furcation defect was made on mandibular third(P3), forth(P4) and fifth(P5) premolar, and stopping was inserted, After 4 weeks, stopping was removed, and bone graft was performed. Ca-P was grafted in P3(experimental group I), combination of Ca-P and plasma rich platelet were grafted in P4(experimental group Ⅱ), and P5 was remained at control group. Systemic antibiotics(gentamicin sulfate) and anlgesics(phenyl butazone) were administrated intramuscular for 2 weeks after surgery. Irrigation with 0.1% Chlorhexidine Gluconate around operate sites was performed during the whole experiment period except one day immediate after surgery. Soft diets were fed through the whole experiment period. After 4, 8 weeks, the animals were sacrificed by perfusion technique. Tissue block was excised including the tooth and prepared for light microscope with Gomori's trichrome staining. At 4 weeks after surgery, there were rapid osteogenesis phenomenon on the defected area of the platelet produced by activated osteoblast. Bone formation was almost completed to the formix of furcation by 8 weeks after surgery. In conclusion, Platelet Rich Plasma can promote rapid osteogenesis during healing of periodontal regeneration.

발파진동 제어에 의한 특수구간 터널굴착에 관한 연구

최형빈,임한욱 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.A

It was difficult to apply conventional excavation methods in some sections from Seoul to Pusan high speed rail road construction of 1 lot 2, due to highway concrete road. gas pipe, water pipe and nearby factories with automatic control system machine. To excavate safely and efficiently in these sections new blast patterns were employed within allowable blast vibration level, by test blast and controlled vibration by sequential blast. Behaviors of the rock mass including convergence and displacement around tunnel were measured with construction works and the crack width in concrete wall also monitored for controlling allowable limits. The results can be summarized as follow : 1. The allowable blast vibration level in structure site is less 1.0cm/sec for highway concrete, 0.5 cm/sec for gas pipe, water pipe and building housing and 0.3 cm/sec for automatic control system machine. 2. The convergence displacement, sing rod extensometer and multi rod extensometer around tunnel and cracks in concrete wall were measured, it was confirmed that the measured values were converged within allowable level. 3. The empirical formular of ground vibrations with 90% confidence lines for PD-3 was given as follow. V_90%=45.549(??)^-1.353

소아환자의 깊은 진정요법 하에서 근단변위 판막술을 이용한 거대협소대의 치료

김종빈,윤형배 大韓小兒齒科學會 1999 大韓小兒齒科學會誌 Vol.26 No.1

The mandibular buccal frenum is defined as a fold of mucous membrane at the posterior labial vestibule and attaches the lips and the cheeks to the alveolar mucosa, gingiva, and underlying periosteum. The buccal frenum becomes a problem when its attachment is too colse to the marginal gingiva. It may then pull on healthy gingiva, encourage plaque formation and interfere with tooth brushing. Especially, heavy buccal frenum mucogingivally results in insufficent attached gingiva, inadequate vestibular depth and high frenum attachment and also difficulty in eruption of mandibular premolar. Frenotomy, frenectomy and mucogingival surgery are used in treating heavy buccal frenum. Frenotomy with autogenous free gingival graft has been used popularly because of its stable result. But, it is difficult in younger children because of inadequate donor site, difficulty in making recipient site and behavior management. Frenotomy with apically positioned flap is considered as more efficient way for a very young child with heavy buccal frenum. Additionally, modified deep sedation with N₂O-O₂can be used as an adjunct for the effective treatment outcome. Decrease in muscle pull, adequate width of attached gingiva and increased vestibular depth can be expected from this treatment approach.