광도 변화가 광중합형 컴포머와 컴포짓트 레진의 중합도 및 불소 유출에 주는 영향

최재윤,이해형,임범순,이용근,신현철 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4

The purpose of this study was to investigate the fluoride releasing behavior of one self-curing glass-ionomer (Fuji II), one light-curing glass-ionomer (Fuji II LC), three compomers (PrismaFlow, UniFil F, and Dyract AP) and SIX composite resins (Flowline, Fissurit FX, Flow-It, Wave, Heliomolar Flow, and Glacier) as a function of light intensity. Disk type specimens were stored in deionized water at 37℃ for 1, 2, 4, 8 hrs and 1, 2, 7, 14, 21, 28 days. The deionized water was changed after measurements. The amount of fluoride ion, which was released from specimens, was measured by pH/ISE Meter (Istek Model 730P, Korea) with fluoride electrode. The results were statistically compared by Tukey multiple comparisons test (p=0.05). There were significant differences in degree of polymerization between specimens with 1 hr after irradiation and those with 24 hrs after irradiation (p<0.05). The cumulative amount of fluoride released was decreased with increasing light intensity (or degree of polymerization). The fluoride-releasing patterns of specimens were significantly different (p<0.05).

복직근 및 박근 근피판술을 이용한 골반 및 서혜부 연부조직 결손의 재건

이재화,정윤규,김주봉,유대현,황성관,이훈범,김석원 大韓成形外科學會 1997 Archives of Plastic Surgery Vol.24 No.6

Many operations for the reconstruction of the pelvic area have been studied until now. The local muscle flap is often used for the closure of these complex wound. But, these local muscle flaps may not be available for reconstruction due to the factors of infection, radiation, and surgical trauma. Since rectus abdominis muscle and gracilis muscle were introduced, their use has been steadily increased for the reconstruction of soft tissue defect of the pelvic area. Inferiorly based rectus abdominis muscle flap and the gracilis muscle flap have been adopted for well-vascularized soft tissue coverage of the defect of pelvis and groin area. These techniques were utilized in seven patients. Of these patients, rectus abdominis muscle flap was used on four patients and three patients were treated with gracilis muscle flap. Among these, chronic osteomyelitis of pelvic bone has been managed with inferiorly based rectus abdominis muscle flap in three patients. No complication has been found. The mean postoperative follow-up period was 26 months, with a range of 12 to 39 months. In conclusion, these muscles are functionally expandable , and provide adequate tissue volume with sufficient blood supply away from the zone of injury, and readily transposed into the pelvis and groin area through subcutaneous tunnel, and serve as an antibiotic delivery system that aids in the eradication of infection. These findings suggest a reconstructive option for the defect of pelvis and groin, and/or bone infection in this area.

海砂 混合率 變化에 따른 水中不分離性 콘크리트의 特性에 관한 硏究

김명식,윤재범,김광민,이상명 釜慶大學校 1999 釜慶大學校 論文集 Vol.4 No.1

The objective of this study is to investigate the characteristics change of antiwashout underwater concrete with variation of blen ratio of sea sand to total fine aggregates through experimental studies. The flowability(slump flow test), antiwashout properties(pH and suspension test), filling property(box test), air and chloride contents property, and the unit weight and the compressive strength of both cast-in-fresh water and cast-in-sea water have been examined experimentally. According to the experimental results, when sea sand are mixed in antiwashout underwater concrete mixture by about 40% per total fine aggregates, it is found that the flowability fit and the compressive strength is higher than others.

유리피판을 이용한 하인두-식도 재건 치험례

봉정표,정윤규,이훈범,김주봉,이재화,나동균,김석원 大韓成形外科學會 1997 Archives of Plastic Surgery Vol.24 No.6

Hypopharyngo-esophageal cancer is usually found at late stage. Its main treatment is surgical intervention and it often requires radical resection. Reconstruction of the hypopharyngo-esophageal defect after the resection of carcinomas of the hypopharynx and the cervical esophagus has traditionally been carried out with deltopectoral or musculocutaneous flap. Another approach is to reconstruct the defect with the colon or stomach. Recent advances in microvascular surgical techniques have resulted in one stage reconstruction with free flap. Both jejunal free flap and radial forearm free flap is a good alternative for the reconstruction of hypopharyngo-esophageal defect. Six cases of the radial forearm flap and nine cases of the jejunal flap were used to reconstructed the hypopharyngo-esophageal defect in 15 patients. In jejunal free flap, upper margin was reconstructed with end to side anastomosis and lower margin with end to end anastomosis. In radial forearm free flap, we used trapezoid shaped flap and tubed by complete or partial tubing according to the condition of the defects. Stricture and fistula are troublesome complications. The complications were peritonitis(n=1) and fistula(n=1). We concluded that both forearm and jejunal free flap is a useful alternative in reconstruction of hypopharynx and cervical esophagus.

폐기 목질 재료로 제조한 학생용 책상 천판의 성능에 미치는 성형조건의 영향

노정관,김재경,김사익,조종수,윤승락,나종범,도정락 한국목재공학회 2002 목재공학 Vol.30 No.4

폐기 목질재료를 사용하여 학생용 책상 천판의 성형시 각 제조조건에 따른 천판의 성능을 검토하였다. 책상 천판의 파티클 구성은 고운 파티클과 거친 파티클을 적절히 혼합한 것이 고운 파티클이나 거친 파티클만으로 제조한 것보다는 전체적으로 성능이 양호하였으며, 특히 표층에는 고운 파티클을 중층에는 거친 파티클을 구성하는 것이 표면 마감성이 가장 우수하였다. 그리고 밀도가 높을수록 박리강도, 휨 강도는 우수하나, 흡수두께 팽창율은 증가하였으며, 수지 도포량이 많을수록 박리강도, 흡수두께 팽창율은 양호하나, 포름알데히드의 방출량은 높았다. 가압온도는 높을수록 대부분의 성능이 향상되었으며, 190℃가 가장 적절하였다. 가압시간은 1단계 2분과 2단계 2분이 비교적 양호하나 2단계의 가압시간을 1분으로 단축하여도 성능에는 큰 문제가 없어 앞으로 생산성의 향상을 기대할 수 있을 것으로 생각된다. This research was performed to investigate the effect of moulding conditions on properties of the table top for student desk manufactured by wood waste materials. The table top manufactured using the mat mixed properly with fine particles and coarse particles generally showed better physical properties than those manufactured using either fine particles or coarse particles did. Especially, highest performance for overlaying was observed when fine particles were used for face layer and coarse particles were used for core layer. The internal bond (IB) strength, the bending strength and thickness swelling increased with the increase of density. Most of physical properties were improved with the increase of hot pressing temperature. The best physical properties were found at 190℃ when the first hot pressing and the second hot pressing times were two minutes. However, the effect of the second hot pressing time of two minutes on the physical properties was not markedly different from that of one minute. This result suggests that the second hot pressing time of one minute is enough to increase the productivity in manufacturing the table top with the least decrease of the physical properties.

아바타 모션 편집기를 통한 상위레벨 모션의 생성에 관한 연구

김가영,김재경,최윤철,임순범 숙명여자대학교 자연과학연구소 2003 자연과학논문집 Vol.- No.14

최근 3D 가상환경에서 아바타를 활용한 분야가 많은 관심을 받고 있다. 아바타를 이용함으로써 정보를 보다 효과적으로 전달할 수 있으며, 사용자들의 관심을 쉽게 이끌어 낼 수 있다는 장점을 가진다. 이러한 아바타 서비스를 제공하기 위해 가장 중유한 분야 중 하나가 아바타 모션 생성기법에 관한 것이다. 본 연구에서는 아바타 상위레벨 모션을 생성하기 위한 편집기 시스템을 제안하고, 상위레벨 모션간의 조합 규칙을 제정하여 모션 조합 시 발생될수 있는 모호성의 문제점을 해결하고자 하였다. Recently, avartar has taken a lot of attention in the various fields of 3D artificial circumstance. The use of avatar has advantages of more efficient communication and easy attraction of users. To provide the services using avatar, the methods for motion generation have been developed and utilized. In this paper. We develope an avatar motion editing system for high-level motion creation and suggest composition rule to solve the ambiguous problem that could by arose from the process of motion composition.

치과용 실험 레진에서 광 기시제와 중합억제제 함량이 광중합에 주는 영향

신현철,임범순,최재윤,이용근 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4

The purpose of this study was to evaluate the effect of fraction of photo-initiator and inhibitor in the experimental resins on the degree of polymerization using a FT-IR and dynamic mechanical analyzer (DMA). Eight experimental dental resins, four different concentrations of photo-initiator (EXP-A, EXP-B, EXP-C, EXP-D) and four different concentrations of inhibitor (EXP-E, EXP-F, EXP-G, EXP-H), were tested. Storage modulus was measured by using DMA (StressTech Rheometer, Rheologica Instrument, Sweden) with fast oscillation mode (1 Hz). After disk-typed (4 ㎜×1 ㎜) samples were irradiated with Halogen light curing unit at 500 ㎽/㎠ for 30 sec, the storage modulus was recorded continuously for 60 min. The degree of conversion was also measured using the FT-IR spectroscopy (FTS-165, Biorad Win-IR, Perkin-Elmer, USA) at 1 hr and 24 hrs after irradiation with the same curing condition as DMA test. The average of results for five specimens was analyzed using Tukey multiple comparison test (p=0.05). From the results, the minimum concentration of photo-initiator was 0.35 wt.% and the maximum concentration of inhibitor was 0.15-0.20 wt.% to obtain the proper polymerization. To enhance the biocompatibility, the concentration of photo-initiator should be added to dental resins as low as possible. To prolong the shelf-life, the concentration of inhibitor should be added to dental resins as much as possible, but biocompatibility due to the inhibitor should be considered to determine the optimum concentration.

정신분열병 환자의 반응시간

최형식,정범석,김한규,송현주,이재원,김창윤 大韓神經精神醫學會 2000 신경정신의학 Vol.39 No.5

연구배경: 주의력은 인지적인 정보처리과정(information processing)의 가장 기본적인 단계이다. 반응시간 (reaction time)은 주의력을 가장 잘 반영하는 검사 중 하나로서, 자극이 제시된 후 반응이 시작되기까지 반응 여부를 결정하는데 걸리는 시간인 판단 시간(decision time)과 반응이 시작되면서 목표에 도달할 때까지 시간인 운동시간(motor time)으로 나누어 볼 수 있다. 기존의 연구결과로는, 정신분열병 환자군에서 반응시간의 수행이 떨어져 있다는 보고는 많이 되어왔으나 차이가 없다는 보고도 있으며, 판단시간과 운동시간 중 어느 부분에 장애가 있는지 명확하지 않다. 또한 반응시간 측정값은 질병의 진단적 유형(diagnostic subtype), 증상, 경과 등의 영향을 받으며 개체간의 변동(inter-individual variation)이 크고, 같은 피험자라도 측정시점이 다를 때마다 차이를 보이는 개체내 변동(intra-individual variation)이 커서 검사결과마다 차이를 보이고 있는 상태이다. 목적: 환자군은 개체간 변동이 크고 다른 임상적 요소에 의해 영향받는 점을 고려하여, 임상적으로 안정적인 경과에 있는 정신분열병 환자만을 대상으로 정상인 군과 반응시간의 차이를 비교하고자 하였다. 또한 반응시간을 판단시간과 운동시간으로 나누어 측정하여 각각을 비교분석 하고자 하였고, 개체내 변동이 큰점을 고려하여 25회 반복 측정을 실시하고 이에 따른 변동의 경향성을 조사하고자 하였다. 방법: DSM-Ⅳ에 의해 '정신분열병'으로 진단된 환자로서, 급성기 이후 항정신병약물을 유지하고 있으며BPRS(brief psychiatric rating scale) 30점 이하의 임상적으로 안정적인 상태가 3개월 이상 유지된10명이 환자군으로 포함되었고, 정상인은 자원자 10명이 포함되었다. 검사도구는 비엔나 테스트 시스템 반응유닛(Reation Unit) 파라미터 S8을 이용하였다. 총 6가지의 자극이 무작위로 1측정시기(session) 당 총 32회 주어지고, 피험자는 이중 특정 자극에 8번만 반응하도록 되어 있다. 시작 전 1회 연습 후 총 25측정시기를 5분 간격으로 반복하였다. 반응 시간을 판단시간과 운동시간의 합으로 정의하고 세 가지 모두 컴퓨터를 이용하여 자동 측정되었다. 반응·판단·운동 시간의 비교에는 반복 측정을 고려한 분산분석(repeated measures analysis of variance)을 사용하였다. 결과: 환자군은 정상인에 비하여 유의하게 반응시간의 수행속도가 저하되어 있었다(p<0.01). 판단시간과 운동시간으로 나누어 볼 때, 환자군에서 판단시간이 유의하게 느렸고(p<0.01), 운동시간은 수행저하의 경향을 보였으나 통계적으로 유의하지는 않았다. 25회 반복측정시 양군 모두 측정시기에 따른 유의한 변화를 보였고(p<0.01), 환자군의 반응시간은 개체간의 차이뿐 아니라 개체내 변동이 큰 경향을 보였다. 옳게 반응한 횟수(correct response)는 환자군에서 저하되는 경향을 보였으나 통계적으로 유의하지는 않았다. 고찰: 정신분열병 환자군에서 판단시간이 유의하게 저하된 것은, 반응시간의 저하가 운동요소 보다는 인지적 요소에 의한 것임을 시사하는 것으로, 정보처리과정의 기본적인 단계인 주의력 장애를 보여주는 것으로 생각된다. 비교적 안정적이고 임상적인 특성이 동일한 환자군에서도 반응시간이 대조군에 비해 큰 개체간 차이와 개체내 변동성의 경향을 보였으며, 이는 단순한 측정오차라기 보다는 정신분열병 환자군의 인지기능의 특성을 반영하는 것으로 생각된다. 중심단어:정신분열병·반응시간·판단시간·운동시간·개체간 변동·개체내 변동. The reaction time(RT) has been known to reflect attention that controls the flow of information processing. Extensive research has demonstrated cognitive impairment in schizophr-enia subjects using RT taske. However, little work has been done examining the relative contribution of DT(decision time) and MT(motor time) to slowed RT in schizophrenics. Also, recent investigators have observed that schizophrenic patients exhibit larger intra-individual variability in RT than do normal comparison subjects. The purpose of this study, using multi-stimulus convergent RT task, was to explore the speed of RT, relative contribution of decision time(DT) and motor time(MT) to slowed RT, overall sequential profile in 25 repeated-time measurements in 10 schizophrenic out-patients and 10 normal control subjects. Overall reaction time and decision time were slower in schizophrenic subjects than in normal controls. The motor time was not shown to be significantly different between the two groups with 0.05 significance level, although there was some trend indicating schizophrenic subjects were slower consistently in repreated measurements over time. These results suggested that the slower reaction time in schizophrenic subjects was mostly determined by cognitive component, decision time rather than motor time. Sequential profile of repeated measurements showed greater intraindividual and interindividual variations in schizphrenics than in normal controls. These results indicate that high variabilities are not merely measurement errors but characteristic of schizophrenic psychopathology. KEY WORDS: Schizophrenia·Reaction time·Decision time·Motor time·Inter-individual variation·Intra-individual variation.

디자인 실기교육 방법에 관한 연구 : A Vision of 21C展을 통한 작품제시를 중심으로

김태진,김윤희,정승혜,홍철순,양재범 경남정보대학 1999 論文集 Vol.27 No.1

농부가 아닌 환자에서 발생한 긴털가루진드기(Tyrophagus Putrescentiae)에 의한 기관지천식 1례

최대로,김형수,고창옥,김희선,윤호성,박용범,김상훈,이재영 대한천식 및 알레르기학회 2004 천식 및 알레르기 Vol.24 No.1

Storage mites are believed one of the most important allergens in farmers and rural regions. Tyrophagus putrescenitiae, belonging to storage mites, is found not only within storehouses but also in the house dust, and the third most common mites following Dematophagoides farinae and Dermatophagoides pteronyssnus in house dust in Korea. The sensitization rate to Trophagus putrescentiae was reported as high as that of house dust mite in patients visiting the allergy clinic in large cities in Korea. We experienced a 69-year-old man who had suffered from dyspnea, wheezing, and coughing for 10 years. He retired from the teaching profession, and had lived in a large city. Deajeon. The skin prick test showed a positive reaction to Tyrophagus putrescentiae and negative reactions to house dust mites. The bronchial challenge test with Tyrophagus putrescentiae showed late asthmatic reaction. We confirmed a Tyrophagus putrescentiae induced asthma in non occupational setting. (J Asthma Allergy Clin Immunol 24 : 141-5, 2004)