가상현실 고소공포증 치료시스템을 위한 생체신호 분석에 관한 연구

柳宗賢,白承和,白承殷,金東完 明知大學校 産業技術硏究所 2005 産業技術硏究所論文集 Vol.24 No.-

Acrophobia is a symptom of feeling an abnormal fear of heights. Medications or cognitive-behavior methods have been mainly used to treat the acrophobia. In these days the virtual reality technology has been applied to treat such an anxiety disorders. But former acrophobia treatment systems use only patient's score of the questionary to appraise. The new system developed in this thesis uses not only patient's score of the questionary but also biomedical signals such as HR, GSR amplitude to increase the objectivity and quantitativity. The experimental results show that HR and GSR amplitude are useful for decision of acrophobia. We will apply this system to the acrophobia patient and be able to offer better medical treatment for mental illness in near future.

산업부산물을 이용한 고성능 콘크리트의 특성에 관한 연구

류현기,윤승조 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.2

This is study intended to develop the high performance concrete by using Fly Ash, Silica Fume and Expansive Additives in order to prevent the crack from caused by dry-shrinkage and get the economical efficiency. Form the test results, the optimum addition rate based on the fluidity, segregation resistibility, strength and length-change test can be achieved at 5% of Expansive Additives in the combination of 15:5 (Fly Ash : Silica Fume).

간헐폭기 변법에 의한 질소제거

유재현,박승조,윤철중 東亞大學校 1999 東亞論叢 Vol.36 No.-

This study is the removal of nitrogen in the tannery wastewater by modified intermittent aeration process. The experiment was performed with the tannery wastewater of J industry complex located in Pusan. The reactor volume used for experiment was 114.24l as pilot scale. The performance of this process was evaluated by variation of wastewater temperature with 30, 20, 15℃. On operating with wastewater at 30℃ the removal rate of total nitrogen and NH₃-nitrogen were about 93% and 98% respectively. NO₂-nitrogen and NO₃-nitrogen were contained with 20~30mg/L in intermittent and nitrification reactor but those were reduced with 10mg/L in effluent by denitrification bacteria. By the way on operating with wastewater at 20℃ and 15℃ the removal rate of total nitrogen was 97%, 95% respectively. Because of change of operating condition it was prevented the reduction of activity of microorganism temperature down.

영상처리기법을 이용한 균열 진전 측정시스템 개발

류대현,남승훈,김용일,김시천 한국산업안전학회 2002 한국안전학회지 Vol.17 No.4

We proposed a new experimental method which is required to easily observe the growth behavior of fatigue cracks. In the proposed method, the image data of cracks were stored into the computer while the cyclic loading was interrupted. After testing, crack length was determined using an image processing software which was developed by authors. By comparing the data measured by the image processing system with those by the manual measurement with a microscope, the effectiveness of the image processing system was established. If the proposed method is used to monitor and observe the crack growth behavior automatically, the time and efforts for fatigue test could be dramatically reduced.

전두동의 크기와 하악골 성장예측에 관한 연구

경승현,유영규 대한치과교정학회 1997 대한치과교정학회지 Vol.27 No.3

성장기 환자의 치료 계획 수립시 치아 이동만으로 치료를 할 것인지, 악 정형 치료를 동반할 것인지, 아니면 성장후 수술을 할 것인지를 결정하는 일은 쉬운 일이 아니며 특히, 악골의 성장을 예측하는 과정을 치료계획 수립에 매우 중요한 부분이다. 전두동은 조기에 성장이 완료되고 하악골은 20세까지 성장을 지속한다는 점에 착안하여, 측모 두부방사선 사진상에 나타나는 전두동의 크기와 하악골 크기간에 상관성을 알아보기 위해 228명을 골격선 제 I급, 제 II급, 제 III급 부정교합의 3군으로 분류하고 하악골의 장경과 악골의 전후방 관계를 나타내는 3가지 지수(ANB, APDI, Wits)를 측정하여, 서로간의 상관성을 검토한 결과 다음의 결론을 얻었다. 1. 전두동의 크기와 ANB(-0.3633), APDI(0.296), Wits(-0.2380), 하악골 장경(0.2704)은 높은 상관성을 (p<0.001) 보였다. 2. 골격성 제 III급 부정교합군에서, 측모두부 방사선 사진상에 나타나는 전두동의 크기가 골격성 제I급 부정교합군이나 II급 부정교합군보다 크게 나타났다. This author tried to find if the size of the frontal sinus can be used as a diagnostic aid to predict the mandibular growth pattern in growing patients in lateral cephalogram utilizing the fact the frontal sinus completes its growth in earlier stage but the mandible continues to grow until later. At this study, the 228 samples were divided into 3 groups as skeletal Class I, II, III malocclusions and three indicies(ANB, APDI, Wits) were measured which indicate the mandibular body length and the antero-posterior relationship of maxilla and mandible to evaluate their relations with frontal sinus. And results were obtained as followings 1. The size of frontal sinus is highly related to ANB, APDI, Wits and mandilar body length.(p<0.001) 2. The size of the frontal sinus of the Cl III malocclusion group was on the lateral cephalogram larger than Cl I and Cl II group.

알코올리즘 치료를 위한 가상환경 시스템과 HRV 분석

백승은,백승화,유종현,김동완 明知大學校 産業技術硏究所 2005 産業技術硏究所論文集 Vol.24 No.-

Medications or conitive-behavior methods have been mainly used as a treatment of alcoholism, lately the virtualy technology has been applied to the kink of alcoholic disorders. A virtual environment makes him having avility to over come the drink. In this study, we were implemented by making panorama images and 3D object modules using 3D MAX. VRML, JAVA. And the BAR stimulator that composed with a position sensor, head mount display, and audio system, is suggested. To illustrate the physiological difference between a person who has a alcoholism and and without a liquor bottle, heart rate was measured during experiment, and also measured a person's HR after the virtual reality training. We demonstrated the subjective effectiveness of virtual reality psychotherapy through the clinical experiment.

성견에서 표면처리된 교정용 마이크로임플랜트의 골 접촉률 및 동요도

박승현,김성훈,류준하,강윤구,정규림,국윤아 대한치과교정학회 2008 대한치과교정학회지 Vol.38 No.6

The purpose of this study was to evaluate the mobility and ratio of the bone-implant contact (BIC) of a sandblasted, large grit and acid-etched (SLA) orthodontic micro-implant. Methods: Ninety-six micro-implants (48 SLA and 48 machined) were implanted in the upper and lower buccal alveolar bone, and palatal bone of four beagle dogs. Two weeks after surgery, orthodontic force (150 - 200 g) was applied. Two beagles were sacrificed at 4-weeks and the other two at 12-weeks. Histomorphometric comparisons were made between the SLA experimental group and the machined micro-implant as a control group to determine the ratio of contact between the bone and implant. Micro-implant mobility was also evaluated using Periotest. Results: Periotest values showed no statistically significant difference in the upper alveolar and palatal bone between groups except for the lower buccal area. BIC in the upper buccal area showed no significant difference between groups both at 4-weeks and 12-weeks. However, both the groups showed a significant difference in BIC ratio in the rest of the experimental areas between 4 weeks and 12 weeks. The experimental group showed active bone remodeling around the bone-implant interface compared to the control group. Conclusions: There were significant differences in the BIC and the Periotest values between the surface-treated and machined micro-implants according to bone quality in the early stage. 본 연구는 비글견에 식립된 sandblasted, large grit and acid-etched (SLA) 표면처리된 교정용 마이크로임플랜트와 평활면 마이크로임플랜트에 교정력을 가한 후 시간 경과에 따른 동요도와 골접촉률의 차이를 규명하기 위해 시행되었다. 비글 성견 네 마리를 이용하여 상, 하악 협측과 구개측 골에 대해 SLA 표면처리된 표면처리군 48개, 평활면의 비처리군 48개의 마이크로임플랜트 96개를 식립하고 2주의 치유기간 후 교정력(150 - 200 g)을 지속적으로 가했으며 식립 4주 후에 두 마리를 희생시키고, 12주 후에 나머지 2마리를 희생시켰다. 표면처리군과 비처리군 간의 마이크로 임플랜트의 동요도와 골과 임플랜트 간 접촉률을 조직학적인 측면에서 측정 비교하여 다음과 같은 결과를 얻었다. 상악 협측과 구개측에서는 표면처리군과 비처리군의 동요도에서 유의성 있는 차이가 없었으나 하악협측에서는 표면처리군이 유의하게 안정적인 동요도를 보였다. 마이크로임플랜트와 인접골 간 접촉률은 상악 협측에서는 4주와 12주 모두 표면처리군과 비처리군 간에 유의한 차이가 없었으나 하악 협측과 구개측의 경우 4주와 12주 모두 표면처리군이 비처리군에 비해 유의하게 높은 접촉률을 보였다. 표면처리군은 비처리군에 비해 임플랜트 주변에서 활발한 골개조가 관찰되었으며 모든 군에서 이물반응은 관찰되지 않았다. 본 연구를 통해 SLA 표면처리된 마이크로임플랜트는 평활면 마이크로임플랜트에 비하여 식립 초기에는 식립 부위에 따라 유의하게 높은 인접골 간 접촉률과 동요도의 안정성을 보임으로써 다양한 크기와 방향의 교정력의 적용이 가능할 것이라 생각한다.

관절성형술 및 측두근막 이식술을 이용한 악관절 강직증의 치험례

진택현,오승환,류동목,김여갑,이상철 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.1

This is a case of bony ankylosis of right temporomandibular joint with mild facial asymmetry resulted from trauma, which bring about the right condylar fracture, and corrected by interpositional arthroplasty with temporal fascia flap and coronoidectomy. The postoperative results were functionally and esthetically good, but continued osbervation is necessary to evaluation of abnormal bony growth and reankylosis.

人參成分 抽出에 관한 硏究

柳洲鉉,卞裕亮,劉承坤 연세대학교 산업기술연구소 1978 논문집 Vol.8 No.1

The amount of ethanol extract from ginseng was about 20.3% (w/w)and the yield of saponins from the extract was 5.5% (w/w). The optimum concentration of solvent was 60% ethanol. The optimum extraction time and temperature were respectively 2 hr and 80℃ when 0.5g of sample (Φ:0.25∼0.42mm) was added to 300ml of solvent. The empirical equation for the extraction of components was as follow: Y(θ,T,φ)=8log(Θ??100)-45log(T??×100)-60log(Φ??×100)+38 The partical size of sample had largely influence on the extraction yield, and the extraction mechanism was considered as diffusion.

충주시 문화회관 구조물 안전성에 관한 사례연구

윤승조,류현기 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.2

The structure which was introduced in this case study of the safe degree was the structure of Chungju Mun Wha Hall located in downtown in Chungju City, Chungbuk. In this case that our country had been developed the rapidly economic development since the 1970's, the several problems of the maintain and management of the existing structure had been started finding on the starting point of the breakdown of Sampung Department and Seongsu Bridge in building a large construction business like the apartment construction of 2 million houses in new town; Illsan, Bundang, Pyongchon, Sanbon, express electric railway and new airport construction, etc, for solving the housing problem including Seoul Olympic Games. In this situation, the evaluation of a concrete crack and its durability, the forecasting of concrete life, the caution in time of selecting the repair method of construction, and the importance of technology development were emphasized again. As a structure which had been built ten years ago, because there have been some cracks in sub-material parts, this thesis researched a crack and the modified state like the several present, the iron frame and the concrete reinforcing degree, the existance or nonexistance of the deficient of the iron framed trust, etc. On the basis of this result, after this thesis investigated the state degree of the structure, it presented the proper repair and the reinforcement of this structure.