콘크리트 내구성 통합 실험 기법 Yoon’s Test의 개발

윤인석 ( Yoon In-seok ),우영웅 ( Woo Young-woong ),김나리 ( Kim Na-ri ),맹찬호 ( Mang Chan-ho ) 한국구조물진단유지관리공학회 2013 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.17 No.2

활막육종

김재도,윤영민,손정환,홍영기,손영찬,박정호,Kim, Jae-Do,Yoon, Young-Min,Son, Jeong-Whan,Hong, Young-Gi,Son, Young-Chan,Park, Jeong-Ho 대한근골격종양학회 1996 대한골관절종양학회지 Vol.2 No.1

Synovial sarcoma is an uncommon malignant soft tissue tumor which usually occurs in young-aged person, and frequently involves the lower extremities. Many authors recommended wide excision, adjuvant chemotherapy and radiation therapy. The proposed factors that affect the prognosis are age, size of tumor, site of tumor in the body, depth of tumor, histologic grade and method of treatment. The purpose of the study is to analyze the factors that affect the 5-year survival rate. We retrospectively evaluated 19 cases of synovial sarcoma treated in the Kosin University Medical Center from Jan. 1982 to Dec. 1994. The overall 5-year survival rate was 47.6% and the 5-year survival rates were significantly higher(P<0.05) in the group with smaller size of mass. The significantly lower 5-year survival rates were observed in the patient with deeply located lesion and with higher histologic grade. The 5-year survival rates were higher in the patients treated with wide excision than in the patients treated with amputation. But there was no significant difference between these groups. The adjuvant chemotherapy and radiotherapy were performed. In conclusion, we suggest that the better prognosis will be observed in the patients with smaller size of tumor mass, superficially located and lower histologic grade.

Ocular MALT Lymphoma : Report of Two Cases

윤영묵,장효찬,김동석,김상원,박미옥,박재복 대구효성가톨릭대학교 1998 연구논문집 Vol.57 No.2

Lymphoma arising in mucosa-associated lymphoid tissue(MALT) is extranodal marginal zone lymphoma displaying a proliferation of follicle marginal zone-type cells(centrocyte-like cells or monocytoid B-cells), often with surrounding reactive germinal centers and lympoepithelial lesions. This typically expresses pan-B-cell markers and monotypic immunoglobulin but not CD5 or CD10. Ocular MALT consists of the lacrimal gland, lcular soft tissue, orbit, conjunctiva and cornea. Lymphoma arising in thses sites is of very rare occurrence in up to 1.5% of all patients with non-Hodgkin's lymphoma. Herein we report two cases of ocular MALT lymphoma which was very rare in the dermatologic field. Case 1, 73-year-old man, developed the right upper conjunctival swelling measuring about 2.0×2.5cm for about 1 year. Histologically, the excised lesion showed follicular centers and infiltration of centrocyte-like cells of B-cell lineage in the stroma but no lymphoepithelial lesions, consistent with low-grade B-cell lymphoma. Case 2, a 66-year-old female, had a rapid course of about 1.2×1.0cm-sized, soft, wellow mass arising from lacrimal gland of the right upper eyelid for about 1 month. Hostologically, the lesion showed diffuse patterend features admixed with centrocyte-like cells and large cells such as centroblast, compatible with high-grade lymphoma. Case 2 received combined chemotherapy of m-BACOD, with a somewhat improvement.

신이식 환자에서 EBV감염과 관련된 악성 임파종 2예

윤선애,진동찬,김용수,신완식,윤영석,방병기,최영진,심상인,고용복 大韓移植學會 1993 Korean Journal of Transplantation Vol.7 No.1

有機農業의 實態와 發展에 관한 事例 硏究 : 忠南 洪城郡 洪東面 有機農家를 中心으로

尹英相,洪性贊,金成敏,具漢謨,申東一,金昌護,姜熙慶 公州大學校 資源科學硏究所 1997 資源科學硏究論文集 Vol.5 No.-

This study was carried out to improve the organic farming system about crop cultivation, compost production and application, plant diseases & pest control, weed control and marketing system of organic farming products to the case study in Chungnam Hongdong area. Agricultural technologies concerning pest & diseases control, weed control and compost production are not established due to lacks of systemized researches by the agricultural scientist, and agricultural machines profitable to this works had not developed yet. In cropping system, reasonable crop rotation had not conducted. The related cultivation of vegetables on the same ground for a long time cause a various plant disease easily. So crop rotation is a reasonable method about soil nutrient utility and soil disease control. It is a good method that introduce the barley and wheat in this field crop system. Those crop have a long root, so can use the other nutrient against the vegetable. In organic farming products, the safety and quality of products by the National Agricultural Products Inspection Center had not inspected except rice, lettus and apple. Inspection is needed for the development of organic farming and mutual confidence between producer and consumer, because the mutual confidence is a major thing to sustain the organic farming. In products marketing, it is more need for the information of organic farming products. Nowaday most products are marketed in Seoul region, but it is not a good method. To search the consumer in near region is a good method for decrease the cost of conveyance and maintain the quality of products. The varieties of distribution structure of organic farming products are required. The products are sold to department store in large city and the prices are about 30% higher than normal products. But when those are supplied in near region, the prices of those are similar to normal products. Direct transactions in near regions is a good method for decrease the cost of conveyance and strength the mutual confidence between producer and consumer.

신경회로망을 이용한 터빈로타 디스크 키웨이의 결함 검출

이병우,이종오,윤운하,이병우,서원찬,이종규 한국비파괴검사학회 2003 한국비파괴검사학회지 Vol.23 No.1

최근 터빈 로타 디스크 키웨이에서 많은 응력부식균열이 발견되었으며, 터빈설비의 중대한 파손을 예방하기 위해 이러한 균열은 조기에 검출 및 평가되어야 한다. 본 연구에서는 초음파탐상의 RF(radio frequency) 신호를 역전파 알고리즘에 근거한 신경회로망에 적용하여 키웨이 주변의 균열에 대한 위치, 크기 및 방향성을 평가하였다. 각 반사영역에서 수신된 여러개의 피크로 나타나는 RF 신호를 각 반사영역에 대해 하나의 최대 피크를 가지도록 처리한 후, 트랜스듀서의 위치 정보와 각 반사파의 도달시간이 들어있는 주사 데이터를 작성하였다. 이 주사 데이터로부터 각 반사영역 사이의 시간차이와 트랜스듀서의 위치 정보를 신경회로망에 적용한 결과 키웨이에서 시작된 균열의 위치, 크기 및 방향성을 평가하는데 유용함을 알 수 있었다. A number of stress corrosion cracks in turbine rotor disk keyway in power plants have been found and the necessity has been raised to detect and evaluate the cracks prior to the catastrophic failure of turbine disk. By ultrasonic RF signal analysis and using a neural network based on back-propagation algorithm, we tried to evaluate the location, size and orientation of cracks around keyway. Because RF signals received from each reflector have a number of peaks, they were processed to have a single peak for each reflector. Using the processed RF signals, scan data that contain the information on the position of transducer and the arrival time of reflected waves from each reflector were obtained. The time difference between each reflector and the position of transducer extracted from the scan data were then applied to the back-propagation neural network. As a result, the neural network was found useful to evaluate the location, size and orientation of cracks initiated from keyway.

열간 단조용 금형강 SKD61의 열처리에 따르는 기계적 성질의 변화

이찬규,최영선,윤재홍,조대현,신희권 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-

The best heat treatment conditions for improving mechanical properties was invastigated about effecting of solution treatment and tempering temperature in various condition of SKD61. The mechanical property of SKD61 has been studied by tensile, hardness and sharphy test, and observation microstructure.

마산만 퇴적물의 중금속 및 유기염화합물 오염에 관한 연구

이찬원,민병윤,권영택,양운진,이규환 경남대학교 환경문제연구소 1990 환경연구 Vol.12 No.-

마산내만 및 마산만 유임 주요하천의 오염퇴적물을 1988년 7월부터 1989년 8월에 걸쳐 채취하여 중금속 및 유기염소화합물을 분석하였다. 오염퇴적충의 뚜께는 10㎝에서 169㎝의 넓은 분포를 보였으며 조사지점의 중금속농도는 지점에 따라 많은 차이를 나타내었다. 특히 인근에 마산수출자유지역 및 조선산업이 위치한 조사 지점에서는 모든 중금속의 농도가 가장 높게 나타났다. 마산만 퇴적오염물 중금속 농도를 오염된 일본의 자료와 비교하였을때 Osaka만의 수온을 제외하고 모든 평균농도가 높게 나타났다. 유기염소화합물(PCB 및 DDE)의 농도는 주거지역 및 공장지대가 함께 위치한 산호천 및 마산시 연안지역에서 높게 검출되었다. 본 연구결과에 의하면 마산만과 같은 폐쇄성 해역에서 중금속 오염원으로 공장폐수가 고려될때는 퇴적된 오염물질의 중금속 분석이 좋은 척도가 철 수 있음을 시사하고 있다. Sediments were collected from Masan bay and two main waterways into Masan Bay in the period of July 1988 to August 1989 for the analysis of heavy metals and Organochlorine compounds. The polluted layer of black sludge had a wide range between 10㎝ to 169㎝ and the content of heavy motels was widely distributed from site to site. One site near the Masan free-export area and a shipmaking company was extremely contaminated by heavy metals. All the average concentration of heavy metals in the sediments from Masan Bay were higher than those from Japanese bays compared except Hg from Osaka Bay. Higher levels of PCBs and DDE were found in sediments from Sanho stream and along the coastal area of Masan city. The results obtained in this study imply that the heavy metal analysis of sediments may be a useful to reveal the pollution sources in a closed bay fuck as Masan Bay.

담체의 표면거칠기와 전단응력이 미생물 부착에 미치는 영향

박영식,송승구,이채남,최윤찬 부산대학교 환경문제연구소 1995 環境硏究報 Vol.13 No.-

The propose of this paper was to examine the effect of surface roughness and shear stress of support medium on the development of biofilm in a rotating biological contactor. The surface roughness of PMMA as a support media was adjusted to 0.4, 0.8, 1.2, and 3㎛, respectively. Shear stress was varied with speed of rotating biological contactor. At low shear stress, bacterial attachment was not varied greatly with surface roughness. But at increased shear stress, bacterial attachment was changed sharply with surface roughness.

고주파용 칩인덕터 유리소재 개발

김영호,송민석,윤영진,박찬욱,이재열 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.1

The glass systems of SiO_2-Al_2O_3-B_2O_3-K_2O were fabricated with the composition of SiO_2 65∼76wt%, B_2O_3 20∼30wt%, Al_2O_3 0.3∼4.5wt%, and K_2O 0.5∼2.5wt% for mother glass of high frequency chip inductor. The glasses were prepared by quenching the melt from 1500℃ and analyzed by X-ray diffraction. The specimens were prepared with composites of ball milled glasses powder mixed with 0∼50wt% of alumina powder. After heat treating at 850℃∼950℃, sintering behaviors were observed by measuring the density of specimens as a function of temperature and the amount of alumina. Dielectric constants and dissipation factors were evaluated with HP-4192A as well as other crucial properties such as strength, softening point and thermal expansion. The density, dielectric constant and dissipation factor of specimen were 2.61g/㎟, 5.9∼6.2 and 0.0013∼0.0016 at 1㎒, respectively.