연근의 열수 추출물이 흰쥐의 국소 뇌혈류량과 혈압에 미치는 영향

박성혜,신언환,구재근,이태헌,한종현 동아시아식생활학회 2005 동아시아식생활학회지 Vol.15 No.1

The purpose of this study was to measure the changes of regional cerebral blood flow(rCBF) and blood pressure(BP) in rats, following the intravenous injection of Nelumbo nucifera water extract. The measurement was continually monitored by laser-doppler flowmeter and pressure transducer in anesthetized adult Sprague-Dawley rats for about 2 to 2 and half hours through the data acquisition system composed of MacLab and Macintosh computer, The results of this experiment were as follows. Nelumbo nucifera significantly increased the changes of rCBF in rats. The rCBF of Nelumbo nucifera was not changed by pretreated propranolol, atropine, L-NNA and indomethacin. But the rCBF of Nelumbo nucifera was decreased by pretreated methylene blue. Nelumbo nucifera decreased the BP significantly, The BP of Nelumbo nucifera was not changed by pretreated propranolol, atropine, L-NNA and indomethacin. But the BP of Nelumbo nucifera was decreased by pretreated methylene blue. These results indicated that Nelumbo nucifera might increase the rCBF and decrease the BP which related to guanylyl cyclase activity.

다포계형식 건축물의 이방에 관한 연구

박언곤,한욱,김재국 대한건축학회 2004 대한건축학회논문집 Vol.20 No.7

This study is on the Korean wooden architecture's Corner Bracket Sets(Gui-kongpo) and one of these elements "Yibang(耳枋)". The Purpose of this study is to understand the relationship between "Yibang(耳枋)" and Korean wooden architecture's structure system. To conduct this research , it is important to analysis its type and structure system in korean wooden architecture "Dapogye". The basic conceptions of "Yibang(耳枋)" are sought, its character and shape is actual surveyed through 140s object buildings in this study. In result, first of all, Using period of "Yibang(耳枋)" is Chosun dynasty and "Yibang(耳枋)" appears in wooden architecture style "Dapogye". Second, the size of roof isn't related with "Yibang(耳枋)", and it's duty is up to Corner Bracket Sets(Gui-kongpo). Third, the buildings with "Yibang(耳枋)" get more 'numerical value ; a2/b' than buildings without "Yibang(耳枋)".

담낭질환의 Neuron Specific Enolase 반응세포 출현에 관한 면역조직화학적 연구

박용욱,박언섭,유재형 중앙대학교 의과대학 의과학연구소 1992 中央醫大誌 Vol.17 No.1

A total 50 patients who had undergone cholecystectomy for cholecystopathy were included in the study to observe the staining pattern of the cells and distribution of antihuman Neuron Spectific Enolase (NSE) antibody by avidin-biotin immunoperoxidase method. The studies consisted of 31 cased of chronic cholecystitis with lithiasis, 9 cases of adenoma and 10 cases of carcinoma including 6 cases of moderately differentiated adenocarcinoma, 3 cased of poorly differentiated adenocarcinoma, and 1 case of small cell carcinoma of combined type. The results were as follows : 1. In the chronic cholecystitis with lithiasis, nine of 31 cases (29%) with the NSE immunoreactive cells, arranged in single of grouped fashion, are focally observed in the covering surface epithelium. 2. The NSE immunoreactivities of carcinoma is more stronger than that of chronic cholecystitis and adenoma. 3. The coarse granular intracytoplasmic strong positive reaction of small cell carcinoma is diffusely observed in noeplastic small cell and glandular epithelium. Therfore, authors suggested that two elements arise from a common primitive cells of endodermal derivation capapble of differentiation along two cell-endocrine ans epithelial.

오스템퍼 처리한 구상흑연주철의 드릴가공 특성과 공구수명에 관한 연구

조규재,이승수,전언찬,박흥식 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.2

Drilling tests were carried out austempered ductile cast iron(ADI) to clarify the factors influencing the drilling chracteristics of ADI material. The machinability of material was evaluated using high speed steel drill and cobalt contained drill of 6mm diameter. The spherodal graphite cast iron materials were austenized at 900℃ for in hour and then wear was kept at 375℃ for 2 hours. Austempered ductile cast iron contains a great deal of retained austenite which contributes to an improvement of impact strength. In this paper, machinability of ADI was investigated by drilling experimentation. The results obtained are as follows: a) Flank wear increases logarithmically with the increases of cutting time. b) Relation of flank wear and cutting force can be applied to FZ = 925VB + 820 for the cutting suggested condition. c) Drilling hole number of about 2 times can be reduced more step feed than ordinary feed due to the high hardness of ADI material and hardness increasing ascribed to the martensite of retained austenite.

어린이의 하악골에서 발생한 Burkitt 림프종

이수언,손미연,최성철,김광철,박재홍 大韓小兒齒科學會 2012 大韓小兒齒科學會誌 Vol.39 No.1

Burkitt 림프종은 B림프구 기원의 악성종양으로 비호지킨 림프종(non-Hodgkin’s lymphoma)의 한 종류이다. Burkitt 림프종은 임상적으로 아프리카에서 나타나는 지역형(endemic), 세계 각지에서 발생하는 산발형(sporadic), 면역결핍상태와 관련되어 나타나는 형태로 나눌 수 있다. 과거에는 그 예후가 매우 불량했으나, 최근에는 집중적인 화학요법으로 인한 치료 성공률이 50-80%에 달한다. 많은 경우 악골을 포함하고 있으며 임상증상으로는 심하게 흔들리는 치아, 치아의 변위 그리고 치은의 발적 및 부종 등이 있다. 본 증례는 진행속도가 상당히 빠른 Burkitt 림프종에 이환된 환아에 대한 내용이다. 악골에 생긴 병소로 내원하였으며, 치과에서 처음 진단하였고 신속하고 적절한 치료를 통해 양호한 결과를 얻었다. Burkitt’s lymphoma is a malignant tumor originated from B lymphocyte and a type of non-hodgkin lymphoma. It is clinically classified by endemic, sporadic and immune deficient forms. In the past, it had poor prognosis but in recent years survival rate is 50~80% treated by intensive chemotherapeutic regimens. Mostly it is a lesion of the jaws. Clinical symptoms are severe tooth mobility, displacement, gingival redness and swelling. This case is about a patient with aggressively progressing Burkitt’s lymphoma of the jaws. Initial diagnosis was done in dental hospital and it has shown satisfactory outcome by prompt and appropriate treatment.

모터구동형 안전벨트 리트랙터의 구동 메커니즘 설계

탁태오,박재순,국민구,김대희,신승언,최석 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A

Motorized retractors enhance the safety of passengers by removing the slack of webbing and by holding upright driving position. Reliability of a driving mechanism that includes one-way clutch between the driving motor and webbing is directly linked to the safety of passenger. In this research, conditions for locking one-way clutch, and also conditions for sustaining locking are theoretically investigated. The operation of a motorized retractor under realistic conditions is simulated in order to validate the proposed retractor design.

모터구동형 안전벨트 리트랙터의 구동 메커니즘 설계

탁태오,박재순,국민구,김대희,신승언,최석 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B

Motorized retractors enhance the safety of passengers by removing the slack of webbing and by holding upright driving position. Reliability of a driving mechanism that includes one-way clutch between the driving motor and webbing is directly linked to the safety of passenger. In this research, conditions for locking one-way clutch. and also conditions for sustaining locking are theoretically investigated. The operation of a motorized retractor under realistic conditions is simulated in order to validate the proposed retractor design.

MgCl₂溶液內에서 STS 304 HP Stainless Steel 熔接部의 破壞擧動에 對한 硏究

金永奭,丁太權,朴昌彦,洪錫柱,梁仁榮,金基玉,朴煥奎,李茂錫,曺圭宰,鄭在康 조선대학교 생산기술연구소 1983 生産技術硏究 Vol.1983 No.-

This paper is based on an experiment analysing the stress corrosion cracking behaviour of welding specimens compared to that of non-welding specimens of STS 304 HP stainless steel in corrosion solution. As a corrosion condition, stainless steel has been known to be the most fragile in a solution of 42% MgCl₂heated to the boiling point, therefore the experiment was carried out in this condition. The experiment was carried out with argon gas TIG welding specimens and non-welding ones made of stainless steel plates, thickness 2mm, by tensile force. At this time, the tensile force was taken to be the value of the yield strength of the tensile test specimens divided by the safety factor of 3.0 to 3.5, 4.0, 4.5, and 5.0. In this paper, the relations between Time of Initial Crack, Time of Failure, Time of Final Fracture and Crack Propagation Length were investigated and then plotted. Furthermore, the relations between Stress Intensity Factor K proposed by Irwin and the Time of Initial Crack, the Time of Failure, the Time of Final Fracture were calculated and plotted. At the last, all the relations plotted were expressed to normal equations by computer, and the equations were used to analyse the data obtained in the experiment. The conclusions obtained in this study are as follows: 1. Welding materials, compared with non-welding ones, as the Time of Initial Crack, the Time of Failure, and the Time of Final Fracture were generally very fast, appeared to be a phenomenon of unstable brittleness fracture. 2. Non-welding materials, compared with welding ones, as the safety factor was larger or the working stress was smaller, appeared to be a phenomenon that the longer had had greater durability. Therefor, welding materials must be considered enough to be used in heate affected and stress corrosion atmosphere. 3. The normal equations of the Time of Initial Crack and the variation rate to the same Stress Intensity Factor K are as follows: (A) Non-welding T =259702.4-5451.2 K+28.386 K² T = -5451.2+28.386 K (B) Welding T= -332.693+28.043 K-0.211 K² T' =28.043-0.211 K here, T; Time of Initial Crack, T'; Variation Rate of Time of Initial Crack to Stress Intensity Factor K, K ; Stress Intensity Factor.

프리텐셔너가 장착된 시트벨트 시스템의 관성잠김 안전버클 개발

탁태오,국민구,김대희,박재순,신승언,최석 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B

To improve passenger safety, seat belt systems with pre-tensioner that tightens seat belt webbing using explosive just before collision are widely used these days. Even though seatbelt must not unlatched without passengers' operation. explosive power of pre-tensioner can cause unlocking of a buckle. To prevent the unlocking, an anti-g mass that blocks displacement of the release button has been attached to the buckle. In this study, the dynamics and statics of locking mechanism associated with operation of anti-g buckle has been theoretically investigated, and important design variables that affect the operation of anti-g buckle have been identified. Through the total seat belt system's dynamic simulation using force and displacement inputs obtained from seat belt sled test, design of the proposed anti-g buckle has been validated.

프리텐셔너가 장착된 시트벨트 시스템의 관성잠김 안전버클 개발

탁태오,국민구,김대희,박재순,신승언,최석 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A

To improve passenger safety, seat belt systems with pre-tensioner that tightens seat belt webbing using explosive just before collision are widely used these days. Even though seatbelt must not unlatched without passengers' operation. explosive power of pre-tensioner can cause unlocking of a buckle. To prevent the unlocking, an anti-g mass that blocks displacement of the release button has been attached to the buckle. In this study, the dynamics and statics of locking mechanism associated with operation of anti-g buckle has been theoretically investigated, and important design variables that affect the operation of anti-g buckle have been identified. Through the total seat belt system's dynamic simulation using force and displacement inputs obtained from seat belt sled test, design of the proposed anti-g buckle has been validated.