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임한혁,최득린,고은석,이혜경,임철완,이상진,홍현숙,최교창,김영화,박재성 순천향의학연구소 1997 Journal of Soonchunhyang Medical Science Vol.3 No.2
Purpose : To evaluate the utility of mammography and ultrasonography in study of morphologic differential diagnosis between malignant and benign mass. Materials and Methods : Average age of patients with breast cancer was 48.4 year-old, and that of fibroadenoma was 29.4 year-old. The equipments used for examination were MF-159 high frequency mammography(Bennet Co.) and Acoustic image 5200S. We evaluated mammographic findings about breast parenchymal pattern, calcification, margin and size of the mass associated tumor nature, and ultrasonographic findings about shape, height and width, internal homogenicity and echo pattern, wall contour, boundary echo, and posterior shadow in breast mass. Thirty-seven of mammographic findings and 34 cases of ultrasonogreaphic findings in pathologically proven breast cancer and 34 case of mammographic findings and 71 cases of ultrasonographic findings in breast fibroadenoma were reviewed retrospectively. Results : In mammographic study, the parenchymal patterns of breast cancer according to Wolfe classification were NI(16.2%), PI(24.3%), P@(37.8%), and DY(21.6%) and those in fibroadenoma were NI(3.1%), Pl(11.7%), P2(35.2%),and DY(50%). Mammographic findings about presence of calcification were as follows; only calcification(16.2%), only mass(51.3%), and mass with calcification(32.5%) in breast cancer, and only mass(91.2%), mass with calcification(8.8%) in fibroadenoma. The features of mass margins were classified as ill-defined margin(45.9%), well-defined(5.4%), and well-defined with partial spiculation(48.6%) in breast cancer and ill-defined(20.5%), well-defined(73.5%), and well-defined with partial spiculation(5.8%) in fibroadenoma. The mass were grouped by size; 1-2cm(37.8%), 2-4cm(45.9%), and 4-6cm(16.3%) in breast cancer and 1-2cm(79.4%), 2-4cm(17.6%), and 4-6cm (3.0%) in fibroadenoma. On ultrasonographic study, the shape of masses in breast cancer were lobulated(82.3%),oval(14.7%), and round(3.0%),and those in fibroadenoma were lobulated(14.0%), oval(57.7%), and round(18.3%). The cases that the height was longer than width were 32.3% in breast cancer and 0% in fibroadenoma. The findings about homogenecity and echo patterns were as follows; hypoechoic(52.9%) and mixed(47.1%) in breast cancer and hypoechoic(2.8%), hypoechoic(63.4%), and mixed(33.8%) in fibroadenoma. The margin of masses were smooth in 85.9% of fibroadenoma, and irregular in 73.6% of breast cancer. The boundary echoes of masses and decreased posterior echo shadow were seen only in 61.8% and 55.9% of breast cancer, respectively. Conclusion: The margin and calcifications are more clearly delineated on mammography but breast cancer and fibroadenoma, both are more commonly developed in dense parenchymal pattern(P2+DY),and there findings are easily obscured in mammography. So ultrasoography is very useful in these masses evaluation, especially amoung young patients.
추연규,탁한호,정민우 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6
In real world, most of plants has a nonlinearity and complexity. Thus it has a trouble for control with general control theory. Up to the present, we have controlled a nonlinear plants supposing that they was linear. But because we did so, many bad matters and errors was brought out in various area. To improve this problem this study tried to control a nonlinear plants with a nonlinear characteristic of artificial intelligence in real world. Industrial crane had a role as plant in this thesis. The critical load was measured and the optimal distance between crane and load and the angle of boom was found with neural networks. So data in table was approximated and generalized by an ability of function approximation in neural networks. The optimal angle of boom for random loads and the distance between crane and loads could be found with a inverse identification of neural networks.
鄭敎範,金한들 홍익대학교 산업기술연구소 2006 産業技術 Vol.16 No.-
This research proposes a design method of the controller to regulate the output voltage of an asymmetric half-bridge(AHB) DC/DC converter, which transfers the energy from a high-voltage DC source to a low-voltage DC load. The steady-state characteristics of the AHB DC/DC converter is analyized using the averaged state equation. The dynamic equation are derived with the linearization and the samll pertubation. The loop gain method is used to design the output voltage regualtor. The performance of the regulator of the AHB DC/DC converter is analytically studied in a computer simulation using PSIM.
김기욱,정윤교,고해주,신혁,유한식 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
Recently, parallel kinematic machine tool with high accuracy and stiffness is causing great concern in 5-Axis processing which is applied in manufacturing with complicated shape products. However, there are some inherent difficulties in parallel kinematic machine tool such as a collision between workpiece and tool, over-cut and under-cut, verification of tool path route in progress. To solve these problem in advance, it needs machine simulation of parallel kinematic machine tool above all things. the purpose of this study is, therefore, carried out machine simulation for parallel kinematic machine tool and accumulation of technical knowledge for the productivity and efficiency in parallel kinematic machine tool through verification of 5-Axis machining.
골반 골절에 동반된 동맥 출혈에서의 경피적 동맥색전술의 유용성
양승부,임한혁,최교창 순천향의학연구소 2005 Journal of Soonchunhyang Medical Science Vol.11 No.1
Purpose : To determine the usefullness of transcatheter embolization of arterial bleeding in patients with pelvic bone fracture. Materials and Methods : Between March 2003 and December 2004, we evaluated 13 injuried arteries of eight patients with pelvic bone fracture, All patients underwent angiography, followed by transcatheter arterial embolization using gelfoam. We investigated the vital sign, survival rate and complication of transcatheter arterial embolization. Results : Angiography revealed extravasation of cantrast media in six patients; extravasation and abrupt cut-off of an artery in two. The injured arteries involved(n=13) were internal pudendal(n=4), obturator(n=3), inferior gluteal(n=3), iliolumbar(n=2) and superior gluteal artery(n=1). Transcather arterial embolization was technically successful and there was no complication in all cases. Old age patients(n=2, >60years) died due to hypovolemia and pulmonary complication. Conclusion : Transcatheter arterial embolization of arterial bleeding is a useful procedure in lowering the mortality and complication in pelvic bone fracture.
양승부,최교창,이상진,정영진,임한혁,한효상,황인철,조환성 순천향의학연구소 2005 Journal of Soonchunhyang Medical Science Vol.11 No.1
Objective : Our purpose of this study is to evaluate the effectiveness of the transcatheter arterial embolization for the management of abnormal uterine bleeding. Materials and Methods : 14 patients with massive or recurrent uterine bleeding underwent percutaneous transcatheter arterial embolization between February 2003 and September 2004. We reviewed 14 cases of uterine artery or internal iliac artery embolization using gelfoam or PVA particles. Results : Good management of uterine bleeding was achieved in 13 of 14(93%) cases. The cause of abnormal uterine bleeding was myoma(5 case), post D & E bleeding(3), acquired vascular malformation(3), pseudoaneurysm(1), adenomyosis(1), and endometrial hyperplasia(1). Conclusion : Transcatheter artery embolization is an effective and life-saving procedure in massive or recurrent uterine bleeding. Early diagnosis and prompt transcatheter arterial embolization is a useful mangement of uterine bleeding.
Development of Functional Foods Products using Mushroom Extracts
Han-Gyo Jo,Hyun-Jae Shin 한국버섯학회 2017 버섯 Vol.21 No.2
Mushrooms have antioxidant, antitumor and antimicrobial activities, so they and their extracts including purified ingredients are being used as a great source of functional food, drugs and especially nutraceuticals. They have many bioactive compounds such as polysaccharides (mainly β-glucans), glycoproteins, nucleotide analogs, terpenoids and polyphenols. These compounds have biological activities such as anti-cancer, anti-viral, anti-obesity, immunomodulating activity and etc. In this review, we discussed the current bioactivity information related to 10 famous mushrooms in Korea. Mushrooms and active compounds derived from mushrooms were summarized as well as mushroom products such as foods, functional foods, and medicines. It can provide good information for scientists and customers who want to develop a new product and to promote health and life quality.