이방향성 형상기억합금을 이용한 공동 주택용 방화 댐퍼 설계 연구

황성태,이찬희,장진수,변창수,히식수렝,이상욱 순천향대학교 산업기술연구소 2022 순천향 산업기술연구소논문집 Vol.28 No.2

The purpose of this paper is to redesign, compare, and study using bi-directional shape memory alloy spring to compensate for the shortcomings of the existing fire damper performance. Through the spring constant measurement experiment, using the difference in force between the coil spring and the shape memory alloy spring, the damper closes when the set temperature is reached, and opens again when the temperature is lowered. In addition, the internal structure was redesigned through smoke leakage experiments. As a result, semi-permanent usable dampers were modeled.

口鼻瘻孔의 處置에 關한 硏究

卞種秀,李相韓,金相鎬 慶北大學校 齒科大學 1985 慶北齒大論文集 Vol.2 No.1

This is a case report of oronasal fistula closure by tube pedicle flap technique. The patient, 28-year-old famale,had an oronasal fistula on the hard palate (4×2㎝, elliptical shape) We used pancake type tube pedicle flap from left upper arm. The ratio of length & breadth of the tube was about 3:1. The first delay was performed about 3 weeks after tube flap preparation and 2nd delay was done 3 weeks later. So, we established good blood circulation inside the tube pedide flap that there wasn't and sign of necrosis. We performed complete obliteration of the oronasal defect on the hard palate with the tube pedicle flap from the left upper arm.

장골 이식을 이용한 총상 환자의 안모변형 처치

변종수,김상호 慶北大學校 齒科大學 1986 慶北齒大論文集 Vol.3 No.1

This is a case report about iliac bone graft in a gunshot patient. The patient, 53-year-old male, had a distorted face due to severe scar formation and loss of about 7 ㎝ of the left mandibular body. We performed a two stage operation, first insertion of acrylic resin bar on the lost mandibular body area. Two weeks later, performed a iliac bone graft. (7x2x 1.5㎝) We used biphase external skeletal pin fixation to stabilize the mandible and the grafted iliac bone. Intermaxillary fixation was removed after 6 weeks and biphase external skeletal pin after 8 weeks postoperatively.

기포부상 분리법을 이용한 Cr(Vl) 제거에 있어서의 단위조작적 해석과 동특성 연구

변동환,이승무,이수구 연세대학교 산업기술연구소 1987 논문집 Vol.19 No.1

This investigation was carried out to study the removal of Cr(VI) from the wastewater by using cethyl ethyl dimethyl ammonium bromide (CEDA-Br) as a foaming agent in the ionic flotation process. To study the dynamic characteristics in this system, the bubble diameter and gas holdup were measured by the photographic and conventional methods and the surface excess concentrations of CEDA-Br and Cr(VI) were determined. Also the removal ratio was studied with changing the operating parameters. The adsorption rate equation of Cr(VI) was derived by using the ratio of surface excess concentrations of CEDA-Br and Cr(VI). And the dynamic equation on the liquid pool of bubble column was derived with mathematical assumptions from model building. The removal ration of Cr(VI) was proportional to the concentration of CEDA-Br in the feed solution and logarithmically to the air flow rate. In the double column system, the removal ratio of Cr(VI) could be increased to 92%.

Kiel Bone이 家兎의 下顎骨 損傷部 治癒에 미치는 影響

金相鎬,卞種秀,李相韓 慶北大學校 齒科大學 1985 慶北齒大論文集 Vol.2 No.1

The purpose of this experimental study was to observe the rate of new bone formation, tissue tolerance and influence in the healing process of bony defect after Kiel Bone graft in the mandible of rabbits. Sixteen hybrid white rabbits were divided into two groups: Control group and experimental group with Kiel Bone graft (1.0㎜ in measured diameter). Each of the experimental and control animals was sacrificed on the 1st, 2nd, 4th, 8th weeks postoperation and mandible was removed. Then the specimens were fixed in the 10% neutral formalin solution for 24 hours and decalcified with nitric acid mixed with formalin (1:9). And then embedded in paraffin, sectioned 6μm thickness and stained H-E stain. The results were as follows: Minimal new bone formation developed by I week after Kiel Bone graft. In control group, new bone formation starts at the 2nd week. At the 4th week, partial resorption of Kiel Bone was noted. The rate and amount of new bone formation were more rapid and abundant in the Kiel Bone graft than control group throughout the eight weeks. There was no foreign body reaction (encapsulation or sloughing) to the grafted Kiel Bone.

큐렛의 硏磨方法에 대한 走査電子顯微鏡的 評價

金星辰,卞種秀 慶北大學校 齒科大學 1985 慶北齒大論文集 Vol.2 No.1

The purpose of this study was to evaluate the cutting edges of curettes sharpened by several sharpening techniques. For the experiment, twenty-one new, double-ended 5 6 Gracey curettes were selected. Curettes were divided into 7 groups to evaluate the cutting edges of curettes as they came from the manufacture, after they had been made dull and after they were sharpened by several sharpeniog techniques. Micrographs were taken of the cutting edges with SEMat a magnification of 200. The results of this study were as follows: In the factory edges which were examined as they came from the manufacturer, functional wire edges were consistently seen pushed over into the of the blade. Dull edges had a large facet or third surface created between the face and the lateral surface of the blade. The edges of curettes sharpened on the face of blade showed nonfunctional wire edges, but the edges of curettes sharpened on the lateral surface showed functional wire edges. In the curettes sharpened with a rotating, composition stone on the face followed by the RX Honing Machine on the lateral surface of the blade, an excellent edge consisting of a fine, smooth line angles free of wire edges was consistently seen.

국소마취제에 함유된 에피네피린의 함량이 골격근에 미치는 영향

최성진,이상한,변종수 慶北大學校 齒科大學 1988 慶北齒大論文集 Vol.5 No.1

The purpose of this study is to examine how 2% lidocaine HCl and 2% lidocaine HCl containing epinephrine in various amounts (1 : 100,000, 1 : 50,000) influence the skeletal muscle. 30 Sprague-Dawley rats were used in 3 groups in the experiment. In injected intramuscularly 2% lidocaine HCl without epinephrine, lidocaine HCl with epinephrine 1 : 100,000 and 2% lidocaine HCl with epinephrine 1 : 50,000 on the surface of the gracilis anticus of the both thighs of them respectively. And as the Control, I injected normal saline on the gracilis posticus of the both thighs similarly. After single injection, two rats was killed on the 1st, 2nd, 4th, 8th and 16th day and then their muscles were removed and prepared for light microscopic examination. The obtained results are as following. After single local injection, clinically effective concentrations of local anesthetics (lidocaine HCl, 2%) and epinephrine, alone or in combination, caused inflammation, atrophy and necrosis in skeletal muscle of rats. While saline injected as control caused no specific changes except for mild edema. Damage was rapidly resolved and completed and muscle regeneration was followed. The initial muscular damage was most severe in 2% lidocaine HCl with epinephrine 1 : 100, 000 and in 2% lidocaine HCl with epinephrine 1 : 50,000, but the muscular regeneration was more favorable in 2% lidocaine HCl without epinephrine. The findings suggested that the muscular damage was caused directly by local anesthetics rather than epinephrine contained in lidocaine without relation to amounts of concentration and that the vascular contraction by the action of epinephrine delayed the muscular damage.

유리 전박골피판을 이용한 음경 재건술

정성광,변진석,백봉수,김법완 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.2

Reconstruction of the penis is indicated in a traumatic or surgical amputation, congenital penile absence, micropenis, male pseudohermaproditism, or transsexualism. Initially, penile reconstruction has been performed using a local flap, but often failed because of the multiple procedures, fistula or stricture of the urethra, and no sensation of the phallus. Ideally, penile reconstruction should be a one-stage procedure, creating a phallus with both tactile and aerogenous sensibility, water-tight neourethra allowing for voiding while standing, enough bulk with stiffness, and aesthetically acceptable appearance. Since August 1989 we have constructed a penis in 4 patients. We selected the radial forearm flap as a donor site because it offers a reliable artery, veins, nerves, and stiffner. It also offers thin, malleable skin with adequate width and length. We have followed these patients from 5 months to 10 months. All operations were successful except for one fistula formation.

위장관 출혈을 일으킨 공장의 형활근종 1예

김병수,장성종,부귀범,조운택,박찬국,김만우,변주남,김정용,전호종 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.1

Small bowel leiomyoma is a rare tumor which may occur wherever smooth muscle is present. The small bowel is the most common site and it makes up 20~30% of all benign small intestinal neoplasms. A spectrum of symptoms are common ranging from nausea, vomiting, abdominal pain, to massive intestinal bleeding. Bleeding is the most common symptom and is usually gross and recurrent. Occasionally it may be life threatening. But, the most serious problem is both the absence of specific clinical symptoms, and the difficulties shown in radiological diagnostics of the small bowel. If conventional diagnostic methods fail to reveal any positive findings for gastrointestinal bleeding, the diagnosis of intestinal leiomyoma should be suspected and an SMA angiography shoud be performed. The angiographic criteria of small bowel leiomyoma is very characteristic. We present a case of leiomyoma with considerable and prolonged gastrointestinal bleeding, which was diagnosed by angiography. A 61-year old woman was admitted with a history of melena over the last 10 days. An SMA angiography showed a hypervascular mass with a diameter of 3×3cm. A segmental resection was performed under the impression of the gastrointestinal bleeding due to leiomyoma of the small bowel. Microscopic examination of the lesion shows interlacing or whorl bundles of spindle shaped ces and no mitosis.

뇌손상 후 운동신경기능 회복 기전 : 기능적 뇌 자기공명영상의 유용성 The Usefulness of fMRI Study

장성호,한봉수,장용민,변우목,김성호,조윤우 한국뇌학회 2001 한국뇌학회지 Vol.1 No.1

목적: 본 연구는 뇌손상환자에서 기능적 뇌 자기공명영상(functional magnetic resonance imaging, fMRI)을 이용한 대뇌운동피질 뇌지도화를 시행하여, 운동신경기능 회복 기전에 대한 기능적 뇌 자기공명영상의 유용성에 대하여 연구하였다. 방법: 신경학적 증상과 병력이 없는 성인 8명과 뇌손상환자 5인을 대상으로 하였다. 뇌손상환자 중 2명은 뇌종양환자이었으며 1명은 뇌출혈, 1명은 뇌경색, 1명은 뇌낭미충증환자이었다. 기능적 자기공명영상은 1.5T MR scanner로 Blood Oxygen Level-Dependent(BOLD) 기법을 적용하였다. 운동과제는 손가락을 1-2Hz의 주기로 쥐었다 펴기를 반복하도록 하였다. 결과: fMRI를 촬영한 결과 정상인 8인, 즉 총 16개의 손중 15개의 손과 환자 5인의 이환되지 않은 손운동시 반대측 일차 운동피질 꼭지(knob)를 중심으로 일차 감각운동피질(SM1)이 활성화되었다. 정상인 중 1인의 한 손에서 반대측 SM1과 동측 일차 운동피질(primary motor cortex, M1) 및 보조운동영역이 동시에 활성화되었다. 뇌손상환자의 이환측 손운동시 환자 1에서는 일차감각피질(primary sensory cortex, S1), 환자 2와 환자 3에서는 양측 SM1, 환자 4와 환자 5에서는 반대측 SM1이 활성화되었다. 환자 1에서는 손상된 M1의 운동신경기능이 S1으로 이전된 것으로 추정되며, 환자 4와 5에서는 손의 운동신경기능이 피질척수로에 의하여 유지되고 있는 것으로 추정되었다. 그러나 환자 2와 환자 3에서 발견된 동측 운동피질 활성화는 본래 정상적으로 존재하던 운동신경 경로인지 뇌손상 후에 발생한 운동신경기능 회복 경로인지 구분할 수는 없었다. 결론: fMRI을 통한 대뇌 운동피질 지도화는 뇌손상 후 병변 주위로의 재조직되는 회복 기전과 피질척수로에 의해 운동신경기능이 유지되고 있음을 입증하는데에 유용할 것으로 생각된다. Objective: This study investigated the usefulness of functional magnetic resonance imaging (fMRI) in the research of motor recovery mechanisms in brain injured patients. Method: Eight control subjects and five brain injured patients were investigated. Out of five patients, two were with brain tumor, one cerebral hemorrhage, one cerebral infarction, and one neurocysticercosis. fMRI was performed using the blood oxygen level-dependent (BOLD) technique at 1.5 TMR scanner with a standard head coil. The motor activation task consisted of finger flexion-extension exercises in 1-2 Hz cycles. Results: fMRI showed activation of the contralateral primary sensori-motor cortex(SM1) by the hand movements of all control subjects and by the unaffected hand movements of all brain-injured patients. Activation of the supplementary motor area(SMA) by one hand movement was also seen in one control subject. Hand movements of the affected hand of the brain injured patients resulted in activation of the contralateral primary sensory cortex(S1) in patient 1, both SM1 in patients 2 and 3, and the contralateral SM1 in patients 4 and 5. Conclusions: It is concluded that fMRI is useful for the research of perilesional reorganization and sparing of the corticospinal tract during the motor recovery mechanisms after brain injury.