채용시 건강진단에서 요ㆍ천추부 단순 방사선 검사의 평가

임현술,김수군,김덕수,이현경,최대섭 대한산업의학회 2000 대한직업환경의학회지 Vol.12 No.2

Objectives : A study was conducted for investigating the status of simple X-rays on lumbo-sacral regions at pre-employment health examination and analysing the effectiveness of simple X-rays on lumbo-sacral regions. Methods : The study data were pre-employment health examination data in a university hospital from Jan 3, 1993 through October of 1997. And, 97 newly employed workers who claimed no low back pawn at pre-employment health examination of a certain company were follow-up survey about low back pain and related factors in April, 1995 and October of 1997. The data were collected by a self-reported questionnaire and a medical examination with a rehabilitation specialist. Results : 1. Taking the simple X-rays on lumbo-sacral regions was 1,591 workers (10.5%) among 15,166 pre-employment health examination from Jan 3, 1993 through October of 1997. And yearly application rates of these X-ray tests have been significantly statistical increasing (p〈0.01). 2. The abnormal findings of simple X-rays on lumbo-sacral regions at pre-employment health examination were 40 workers. But, there was not significantly statistical difference between normal and abnormal group for the complaint rate of low back pain. 3. The number of case with symptoms of low back pain at the follow-up survey were 46, so The incidence density was 37.1 persons/ 100 person-years. And the incidence density was not significantly statistical difference between normal and abnormal group of simple X-rays on lumbo-sacral regions. 4. Through the multivariate logistic regression, significantly associated factors with low back Pain were found to be tenure(OR=0.36, 95%CI : 0.17-0.79), lifting of heavy materials (OR=5.86, 95%CI : 1.58-21.74) . Conclusion : The simple X-rays on lumbo-sacral regions at pre-employment health examination is required further research for utilizing pre-employment health examination according to above results.

Identification of Novel Endo-β-1,4-glucanase Isoforms fromBursaphelenchus Species (Nemtoda: Aphelenchoididae)

Dae-Weon Lee,Il Sung Moon,강재순,Hyun Jung Choe,최재영,제연호,이시혁,Hye Rim Han,Kook-Jin Lim6,Young Ho Koh 한국응용곤충학회 2007 Journal of Asia-Pacific Entomology Vol.10 No.2

Bursaphelenchus xylophilus has been recognized as a causal pathogen of pine wilt disease (PWD). In order to identify relevant molecular biomarkers, we selected a variable region of endo-β-1,4-glucanase (β14-gcn) which was cloned from the cDNA of B. xylophilus and B. mucronatus. We then identified three novel β14-gcn isoforms: Bm-β14-gcn and Bm-β14-gcni from B. mucronatus, and Bx-β14-gcn from B. xylophilus. Bm-β14-gcn and Bx-β14-gcn were found to be identical, whereas Bm-β14-gcni was unique to B. mucronatus. These isoforms are Bursaphelenchus-specific and may be employed as molecular markers for the diagnosis of PWD. Our phylogenetic analysis showed that these β14-gcns from Bursaphelenchus species were associated most closely with fungal β14-gcns.

하악골 비대칭과 측모두부방사선사진상 이중영상 간의 관계

임현대,한경수 원광대학교 치의학연구소 2003 圓光齒醫學 Vol.12 No.2

This study was performed to investigate the affecting factors to double images on the cephalometric radiograph. For this study, 28 patients with temporomandibular disorders and 31 healthy dental students without any signs and symptoms of temporomandibular disorders were selected, and the cephalometric and the panoramic radiographs were taken. The observed and measured points related to double images on the cephalometric radiograph were Or, Go1, Go2, Go3, and C1. Both mandibular ramus height were measured on the panoramic radiograph. Natural head and body posture in the frontal and the sagittal plane were observed with CROM?? and with posture measuring board, with regard to several parameters. The data obtained were processed with SPSS Windows?? program. The result were as follows : 1. There were no correlation between the difference of both mandibular ramus height and the length of cephalometric double image at observed points. 2. The length of double image in Or and Go2 in the subjects with more headtilt in frontal plane(≥2˚ )were different from the subjects with less headtilt(≤1˚ ). 3. Difference of angulation of both sternocleidomastoid muscles in sagittal plane did not affect the length of cephalometric double image in all the measured points. 4. There were negative correlation between the length of cephalometric double image in Go1 and C1 and canthotragus angle. 5. There were no correlation between the length of cephalometric double image and the frontal parameters, but there were significant correlation between the length of double image and the sagittal parameters such as sagittal angle, degree of forward head posture(FHP), and canthotragus angle.

갑상선암 예측에 있어 초음파적 변수 분석

임현정,최영식,박요한,오경승,이강대 고신대학교 의학부 2004 高神大學校 醫學部 論文集 Vol.19 No.1

Background: The introduction of high resolution sonography has made it possible to detect nodules in the thyroid gland. However, there has been no reliable sonographic sign for distinguishing between benign and malignant thyroid conditions. The aim of present study was to evaluate ultrasonographic (US) parameters in predicting thyroid cancer. Methods: One hundred fifty three patients who underwent thyroidectomy at Kosin Medical Center from January, 2000 to April, 2002 were included in the study. All patients were checked high resolutional US before surgery. Of the 153 patients 89 were malignant tumors and 64 benign. Malignant US parameters were defined as calcification, irregular margin, more taller than wide, and fat line obliteration. Calcification pattern was classified with single, punctated, and amorphous calcification. The US characteristics to predict malignancy were evaluated by means of multiple logistic regression analysis. Results: All of the malignant sonographic parameters such as calcification, 53 (89.8%) were thyroid carcinoma. The incidence rate of malignancy was 55.9% in solitary nodules and 65.7% in multiple nodules (p=0.303). Even though nodule size was less than 1.5㎝, the incidence of malignant tumor was 69.5% (p=0.04). Of 53 malignant nodules with calcification, the incidence of single, punctated, and amorphous calcification pattern was 6 (11.3%), 22 (41.5%), 25(47.2%), respectively. The sensitivity, specificity, positive and negative predictive value, and accuracy of sonographic parameters were 76.4%, 87.5%, 89.5%, 72.7% and 81.0%, respectively. Upon the correlation of US-guided FNA cytology with pathologic diagnosis, the sensitivity of ultrasound-guided FNA cytology in differentiating benign and malignant nodule was 85.9%, the specificity 100% and overall diagnostic accuracy was 91.2%. The sensitivity, specificity, and accuracy of US parameters associated to follicular neoplasm, all were 75.0%. Conclusion : All the malignant US parameters including calcification, irregular margin, and more tall than wide showed high level of sensitivity, specificity and accuracy. Of these parameter, calcification and irregular margin were more significants. The more presence of calcifications with punctated and amorphous pattern could suggest the higher possibility of malignancy. However, further study is needed for clinical application of malignant US parameters in the thyroid tumors.

Zr/Ti 비에 따른 PZT계 압전세라믹스의 온도안정성

임대관,현원석,이개명 濟州大學校 情報通信硏究所 1998 情報通信硏究所論文集 Vol.1 No.-

In this paper, temperature stabilities of Pb( Zr_xTi_(1-x))O₃ piezoelectric ceramic system according to Zr/Ti ratios were investigated. PZT ceramics with Zr/Ti =58/42, 56/44, 53/47, 50/50, 48/52 which are adjacent compositions to Mophotyophic phase were fabricated, and thermal aging effects on the specimen were measured. After thermal aging. the specimens with Zr/Ti=58/42, 56/44, 48/52 in them could have lower temperature coefficient for antiresonant frequency and the specimen with Zr/Ti = 58/42 which is a composition of Rhombohedral phase have had the lowest temperature coefficient for antiresonant frequency.

자동 경계 탐지(Automated Border Detection)심초음파도를 이용한 좌심방 면적 및 기능의 평가

김현주,주승재,임진형,정효균,이영수,유호대,차태준,이재우 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.2

CAN 시스템을 위한 트래픽 분석/생성 시스템 설계및 구현

권대현,임준홍 漢陽大學校 工學技術硏究所 2000 工學技術論文集 Vol.9 No.1

CAN은 매우 높은 보안수준의 실시간 분산제어를 효과적으로 지원하는 직렬통신 프로토콜이다. 본 논문에서는 CAN 시스템의 트래픽 디코더 및 제너레이터가 제안되고 구현되었다. 이러한 작업은 네트워크 성능 분석에 사용되어 질수 있으며, 또한 네트워크의 관리와 감독에 사용되어질 수 있다. CAN is a serial communications protocol which efficiently supports distributed realtime control with a very high level of security. In this paper, a traffic decoder/generator for CAN systems is proposed and implemented. This can be used to analyze the performance of the network. It can also be used to manage and monitor the network.

아몰퍼스 자성박대의 자기센서 응용에 관한 연구

金大柱,林在根,金玄郁,愼鏞鎭 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-

In this thesis, we have described about application of amorphous magnetic ribbon of FeCoSiB compound to magnetic sensing device. As the samples of our experiment, we used a near zero-magnetostrictive amorphous magnetic ribbon of (Fe0.06Co0.94)79Si2.1B18.9 composition with its thickness of 26[㎛], its length of 5[㎝] and its width of 2[㎜], which was fabricated by rapidly quenching method. In order to improve the magnetic properties of the samples, we annealed them under magnetic field where the range of the crystallization temperature Tx and the Curie temperature Tc were 300~400[℃]. Then, by measuring them with X-ray diffraction(XRD) and vibrating sample megnetometer(VSM) analysis method. we found Tx≒451[℃] and Tc≒441[℃]. From the hysteresis curve of the finally annealed sample ribbon, we found the Large Bakhausen Jump(LBJ) effect at the reversal magnetization field Hw≒0.5[Oe]. This LBJ effect was also observed at the variation of the magnetic domain in the process of magnetization. Thus, it is proved that the amorphous magnetic ribbon of FeCoSiB compound can be use as a magnetic sensing device.

생활폐기물을 이용한 세라믹스 판재 개발

신대용,임현태,최돈량 강원대학교 부설 석재복합신소재 제품연구센터 2002 석재연 논문집 Vol.7 No.-

생활하수처리장에서 발생하는 하수슬러지의 용융슬래그와 장석, 물유리 및 전분을 이용하여 세라믹스 다공판을 제조하였다. 슬래그의 주성분은 SiO_2와 Al_2O_3로서 점토와 유사한 성질을 갖고 있어 세라믹스의 대체원료로 사용이 가능하였다. 하수슬러지를 1,200℃에서 2시간 열처리하여 얻어진 용융물을 수증에 급랭시켜 1∼3mm 입경의 슬래그 분말을 제조하고 80∼95wt%의 슬래그, 5∼20wt%의 장석, 5∼15wt%의 물유리 및 2wt%의 전분을 혼합하여 1,100∼1,200℃에서 2시간 소성하여 시편을 제조하였다. 슬래그의 첨가량과 소성온도가 증가함에 따라 시편의 부피비중 및 압축강도는 증가하였으나, 기공률과 흡수율은 감소하였다. 1,030℃에서 2시간 소성한 No. 1, 4 및 7번 시편은 부피비중 1.52∼1.67, 기공률과 흡수율 23.3∼ 32.5% 및 14.1∼19.3%, 압축강도 81∼173kgf/㎠의 값을 나타내었다. 또한, 슬래그의 첨가량과 소성온도가 동등한 시편은 물유리의 첨가량이 증가함에 따라 부피비중과 압축강도가 증가하여 No.7, 8 및 9번 시편은 부피비중 1.52∼1.94, 압축강도 81∼385kgf/㎠의 값을 나타내었다. 시편의 중금속용출량은 미량으로서 매립지 침출수배출 허용기준치보다 낮게 측정되어 주위환경에 해가 없고 흡음특성이 양호하여 본 연구에서 제조한 세라믹스 다공판은 흡음판으로의 이용이 가능하였다. Utilization of sewage sludge from the sewage sludge treatment facilities and the municipal wastes became very important matter to be solve for the environmental protection and recycling of waste materials. The reusability of sewage sludge slag as a raw material in the manufacturing process of ceramics was highly expected because the chemical composition of slag was mostly SiO_2 and Al_2O_3 and its properties were very similar with clay. Sewage sludge slag was fabricated by sintering at 1,200℃ for 2 hours and it was crushed into powder with particle size of 1∼3mm by a rapid cooling treatment in water. Then, the mixture of 80∼95 wt% of slag, 5∼20 wt% of feldspar, 5∼15 wt% of water glass and 2 wt% of starch were heated at 1,000∼1,100℃ for 2 hours. The density and compressive strength of specimen increased with increasing the sintering temperature and the addition amount of slag, No. 1, 4 and 7, specimens were shown 1.52∼1.67 of bulk density, 23.3∼32.5% of porosity, 14.1∼19.3% of water absorption and 81∼173 kgf/㎠ of compressive strength. And, that of the specimen at the same sintering temperature and addition amount of slag increased with increasing the addition amount of water glass, No. 7, 8 and 9 specimens, bulk density was 1.52∼1.94 and the compressive strength was 81∼385kgf/㎠. An extraction test for specimen to detect the toxic materials, such as Cu, Cd, Cr, Pb and As, showed below the permitted standard of land-filling extractable heavy metal contents. Sound absorption coefficients of specimen had a good properties in No. 7 specimen, and can be used as a sound absorption plate.

인터넷 트래픽 모니터링을 통한 네트워크 관리 시스템 모델링과 시뮬레이션

권대현,임준홍 漢陽大學校 工學技術硏究所 2000 工學技術論文集 Vol.9 No.1

본 논문에서는 네트워크 관리 시스템(NMS)을 제안하고 구현하였다. NMS에서 네트워크 트래픽 장애를 MRTG을 사용해서 측정하였고 링크간 특성을 평가하였다. 또한 발생 가능한 네트워크 문제를 확인하였으며 네트워크 시뮬레이션을 수행하였다. 이러한 작업은 네트워크의 분석과 성능을 향상시키는데 사용될 수 있다. In this paper, Network Management System(NMS) is proposed and implemented. In the NMS, network traffic load is measured using MRTG and link-to-link characteristics are evaluated. Also, the possible causes of occurring network problems are identified and the network simulations are performed. This can be used to analyze and/or enhance the performances of the network.