대전 도덕봉과 백운봉의 산림군락 분류

김효정,이미정,지윤의,안승만,이규석,송호경 한국환경생물학회 2002 환경생물 : 환경생물학회지 Vol.20 No.3

본 연구는 계룡산국립공원의 지류인 도덕봉과 백운봉의 산림식생을 대상으로 식물사회학적 방법에 의해 산림군락을 분류하고 이 지역의 식생 현황 파악과 국립공원관리에 필요한 기초자료를 제공하고자 하였다. 식물사회학적 방법으로 89개 조사구를 분석한 결과, 신갈나무군락, 졸 참나무군락, 굴 참나무군락, 소나무군락, 서어나무군락, 리기다소나무-곰솔군락으로 구분되었다. 신갈나무군락은 해발고가 가장 높고 경사가 급한 지역에 분포하였으며,졸참나무군락은 해발고가 비교적 낮고 경사가 급한 지역에 분포하였다. 그리고 굴참나무군락은 신갈나무군락에 비해 해발고가 낮은 남사면의 건조한 지역에 분포하고 있었다. 소나무군락은 해발고가 비교적 높고 폭이 좁은 건조한 능선 부위에 분포하고 있으며, 서어나무군락은 주로 남사면 계곡부의 중부에 분포하고 있었 다. 그리고 리기다-곰솔군락은 조림군락이다. This study was carried out to classify forest vegetation community of Dodeokbong and Baekwunbong in Gyeryongsan. Employing the releve method of Dierssen, 89 plots were sampled. Forest community was classified into Quercus mongolica community, Quercus serrata community, Quercus variabilis community, Pinus densiflora community, Carpinus laxiflora community, and Pinus rigida-Pinus thunbergii community. Quercus mongolica community was found in high altitude and steep area, Quercus serrata community in relatively low altitude and steep slope area, and Quercus variabilis in southern arid and low area compared with Quercus mongolica community. Pinus densiflora community is present in relatively high altitude and narrow arid ridge area. And, Carpinus laxiflora community is mainly distributed in southern valley area. Pinus rigida-Pinus thunbergii community is planted community.

금병산과 적오산의 산림군락 분류

김효정,이미정,지윤의,이규석,송호경 忠南大學校 環境問題硏究所 2002 環境硏究 Vol.20 No.-

대전에 위치한 금병산과 적오산의 식생을 분류하기 위하여 연구가 수행되었다. 총 41개의 조사구에서 식물사회학적 방법으로 조사를 하였다. 이 지역 산림식생은 크게 이차림식생과 조림식생으로 구분 되었다. 이차림 식생은 소나무군락, 상수리나무군락, 팽나무군락으로 구분되었다. 조림식생은 아까시나무군락, 리기다소나무군락, 일본잎갈나무군락, 곰솔군락으로 구분되었다. 본 조사지역에서 출현한 종수는 총 145종이었으며, 가중나무, 개망초, 미국자리공 아까시나무, 족제비싸리 등 총 5종의 귀화식물이 출현하였다. This study was carried out to classify forest vegetation community of Geumbyeongsan and Jeokosan in Daejeon. Employing the releve´ method of Dierssen, 41 plots were sampled. Forest community ws classified as second forest vegetation and afforestation vegetation. The second forest vegetation was classified into six communities such as Pinus densiflora community, Quercus acutissima community, Quercus serrata community, Quercus variabilis community, Quercus aliena community, and Celtis sinensis community. Afforestation vegetation was classified again as Robinia pseudoacacia community, Pinus rigida community, Larix leptolepis community, and Pinus thunbergii community. In the present study area, we found a total of 145 taxa. We found a total of five naturalized plants taxa of Ailanthus altissima, Erigeron annuus, Phytolacca americana, Robinia pseudoacacia, and Amorpha fruticosa.

실리콘 나노사이즈 광변조기를 위한 나노사이즈 단일모드 광도파로 연구

정의석(Ui Seok Jeong),이광운(Kwang Woon Lee),이동호(Dong Ho Lee),이경운(Kyoung Woon Lee),박정호(Jung Ho Park) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6

A nano size single-mode waveguide for silicon optical modulator was designed using an Effective index method(EIM). The width of waveguide 350nm for single mode operation and the calculated optical confinement was 95.9%. The waveguide was fabricated on SOI(Silicon-On-Insulator) using e-beam lithography. The measured optical characteristics of waveguide showed a propagation loss of 4.46dB/cm and 95.19% optical confinement. A silicon optical modulator utilizing this waveguide was estimated to have 9.3 Vㆍmm modulation efficiency.

Line-CCD를 이용한 수중광학 센서 시스템의 구현

정의석(Jeong, Ui-Seok),이동호(Lee, Dong-Ho),이경운(Lee, Kyoung-Woon),임아람(Lim, A-Ram),정재욱(Jeong, Jae-Wook),박정호(Park, Jung-Ho) 한국전기전자학회 2010 전기전자학회논문지 Vol.14 No.3

수중의 미립자 계수를 위한 Line-CCD를 이용한 수중광학 시스템을 구현하였다. 미립자 계수 측정을 위하여 680nm Laser diode를 광원으로 사용하였다. 광학시스템을 동작확인을 위해 수중 인공탱크 및 해양에서 실험을 하였다. 시스템의 상 하강 운동 시, 마이크로프로세서(FPGA)의 신호 전달(센서의 신호검출)을 통하여 미립자 계수를 알 수 있다. 시스템의 알고리즘은 또한, 깊이에 따른 압력, 온도, 계수 값을 실시간으로 분석한다. 실험을-통해 광학센서 시스템의 높은 정확도를 보여주었다. 따라서, Line-CCD를 통한 실시간 측정 가능한 수중광학 시스템을 제안 하였다. We fabricated optical sensor system that take a measurement particles using a line-CCD in ocean. To measure particles, we used 680nm laser diode which is appropriate. we tested to operate optical system in water tank and ocean. It has performance that detected signal of sensors transfer microprocessor, FPGA as long as move up and down it's motion. The system algorithm also analysis output -pressure, temperature, particle numbers in depth.-For experiment, our particle sensor system has high accuracy counter. therefore, we proposed that a line-CCD is available on optical sensor system in ocean.

MR Imaging in Endometrial Carcinoma as a Diagnostic Tool for the Prediction of Myometrial Invasion and Lymph Node Metastasis

Ui Nam Ryoo,Chel Hun Choi,Ji Yeong Yoon,Soo Kyung Noh,Heeseok Kang,Woo Young Kim,Boh Hyun Kim,Tae-Joong Kim,Jeong-Won Lee,Je-Ho Lee,Byoung-Gie Kim,Duk-Soo Bae 대한암학회 2007 Cancer Research and Treatment Vol.39 No.4

Purpose: The purpose of this study was to evaluate the factors that are associated with the accuracy of magnetic resonance (MR) imaging for predicting myometrial invasion and lymph node metastasis in women with endometrial carcinoma.Materials and Methods: We retrospectively reviewed the medical records and preoperative MR imaging reports of 128 women who had pathologically proven endometrial carcinoma. We compared the MR imaging and the histopathology findings.Results: The sensitivity, specificity and accuracy for identifing any myometrial invasion (superficial or deep) were 0.81, 0.61 and 0.74, respectively; these values for deep myometrial invasion were 0.60, 0.94 and 0.86, respectively. The sensitivity, specificity and accuracy of MR imaging for detecting lymph node metastasis were 50.0%, 96.6% and 93.0%, respectively. The patients who were older, had more deliveries and a larger tumor size more frequently had incorrect prediction of deep myometrial invasion (p=0.034, p=0.044, p=0.061, respectively). A higher tumor grade, a histology other than the endometrioid type, myometrial invasion on MR findings and a larger tumor size were associated with a more frequent false-negative prediction of lymph node metastasis (p=0.018, p=0.017, p=0.002, p=0.047, respectively). A larger tumor size was also associated with more frequent false-positive results (p=0.009).Conclusions:There are several factors that make accurate assessment of myometrial invasion or lymph node metastasis difficult with using MRI; therefore, the patients with these factors should have their MR findings cautiously interpreted. (Cancer Res Treat. 2007;39:165-170)

Dosimetric characteristic of the use of glass dosimeter in high-energy proton beam therapy

Jeong-Eun Rah,Dong Ho Shin,Dea-Hyun Kim,Dong Wook Kim,Ui-Jung Hwang,Hojin Jeong,Sang-Yeob Lee,Doo-Hyun Lee,Myonggeun Yoon,Byeong Lee,Sung Yong Park 대한방사선방어학회 2010 대한방사선방어학회 학술발표회 논문요약집 Vol.2010 No.11

Measurement of proton beam range by using scintillating fiber optic dosimeter

Ui-Jung Hwang,Hojin Jeong,Jeong-Eun Rah,Seung Hoon Yoo,Byung Jun Min,Sang-Yeob Lee,Myonggeun Yoon,Dong Ho Shin,Se Byeong Lee,Sung Yong Park,Kyong Won Jang,DongHyun Cho,Bongsoo Lee 대한방사선방어학회 2010 대한방사선방어학회 학술발표회 논문요약집 Vol.2010 No.11

Genetical identification and morphological description of the larvae and juveniles of Porocottus leptosomus (Pisces: Cottidae) from Korea

( Ui Cheol Shin ),( Yeon Kyu Jeong ),( Sang Chul Yoon ),( Kwang Ho Choi ),( Jin-koo Kim ) 한국수산과학회(구 한국수산학회) 2018 Fisheries and Aquatic Sciences Vol.21 No.4

The larvae and juveniles of Porocottus leptosomus belonging to the family Cottidae were collected (n = 95, 3.9-16.5mm in body length, BL) from Busan, Korea, in March 2015. The larvae and juvenile were identified using DNA barcoding as P. leptosomus, and their morphological description was presented in detail. The yolk-sac larvae (3.9-5.6mm BL) body was slightly compressed, the head was large, the eye was round and large, and the anus was before the middle of the body. The preflexion larvae (5.2-10.0mm BL) body length drastically increased; caudal fin rays began to occur. The flexion larvae (9.4-11.8mm BL) notochord flexion started; dorsal, pectoral, and anal fin rays began to occur; pelvic fin buds are seen; they possessed a pair of parietal spine; and a pair of supraocular cirri was first to develop. At 12mm BL, the notochord was completely flexed. The larva stage (3.9-12.6mm SL) had the stellate melanophores in the head, isthmus, gut, and tail (along to the ventral midline). During the juvenile stage (11.4-16.5 mm BL), melanophores covered the head and began to form five black bands on the side of the body. The larvae of P. leptosomus spent pelagic life, but moved to the bottom during the juvenile stage. The larvae and juveniles of P. leptosomus differ from other cottid larval fishes by body shape, melanophore head pattern, and spine development. P. leptosomus can be distinguished from Porocottus allisi by morphological development and the occurrence of larval fish: preopercular spine development, melanophore pattern, and caudal fin development.

Efficacy of various irrigation methods for the removal of calcium hydroxide paste in the root canal

( Ui-jung Lee ),( Ho-keel Hwang ),( Jeong-bum Min ),( Hyoung-hoon Jo ) 조선대학교 구강생물학연구소 2016 Oral Biology Research (Oral Biol Res) Vol.40 No.4

In this study, we compared the efficacy of calcium hydroxide (Ca(OH)₂) paste removal in the apical part of the root canal using various irrigation methods. Ninety extracted single-rooted teeth were prepared and split longitudinally. At the apical third, a standardized groove was made and Ca(OH)₂ paste was inserted. The two split sections were reassembled and Ca(OH)₂paste was removed with 5 ml 2.5% NaOCl using three different irrigation protocols: conventional syringe irrigation (Control), sonic irrigation (Group 1), and ultrasonic irrigation (Group 2). Samples were split again and the remaining Ca(OH)₂ paste was evaluated under a dental operating microscope using a 4-step scale: score 0, empty groove ; score 1, Ca(OH)₂ paste present in less than half of the groove; score 2, Ca(OH)₂ paste covers more than half of the groove; and score 3, Ca(OH)₂ paste completely fills the groove. Statistical analysis was performed using Kruskal-Wallis and Mann-Whitney tests at 5% significance level. The groups irrigated with sonic (Group 1, 0.8 ± 0.81) and ultrasonic (Group 2, 1.0 ± 1.02) devices showed significantly better removal of Ca(OH)₂ paste from the grooves, as compared to the group irrigated with conventional syringes (Control, 1.53 ± 0.82) (P < 0.05). However, there was no significant difference between the sonic and ultrasonic irrigation groups. The use of additional (sonic and ultrasonic) irrigation protocols enhanced Ca(OH)₂ paste removal in the root canal as compared with conventional syringe irrigation.

Patient-Specific Computational Fluid Dynamics in Ruptured Posterior Communicating Aneurysms Using Measured Non-Newtonian Viscosity : A Preliminary Study

Lee, Ui Yun,Jung, Jinmu,Kwak, Hyo Sung,Lee, Dong Hwan,Chung, Gyung Ho,Park, Jung Soo,Koh, Eun Jeong The Korean Neurosurgical Society 2019 Journal of Korean neurosurgical society Vol.62 No.2

Objective : The objective of this study was to analyze patient-specific blood flow in ruptured aneurysms using obtained non-Newtonian viscosity and to observe associated hemodynamic features and morphological effects. Methods : Five patients with acute subarachnoid hemorrhage caused by ruptured posterior communicating artery aneurysms were included in the study. Patients' blood samples were measured immediately after enrollment. Computational fluid dynamics (CFD) was conducted to evaluate viscosity distributions and wall shear stress (WSS) distributions using a patient-specific geometric model and shear-thinning viscosity properties. Results : Substantial viscosity change was found at the dome of the aneurysms studied when applying non-Newtonian blood viscosity measured at peak-systole and end-diastole. The maximal WSS of the non-Newtonian model on an aneurysm at peak-systole was approximately 16% lower compared to Newtonian fluid, and most of the hemodynamic features of Newtonian flow at the aneurysms were higher, except for minimal WSS value. However, the differences between the Newtonian and non-Newtonian flow were not statistically significant. Rupture point of an aneurysm showed low WSS regardless of Newtonian or non-Newtonian CFD analyses. Conclusion : By using measured non-Newtonian viscosity and geometry on patient-specific CFD analysis, morphologic differences in hemodynamic features, such as changes in whole blood viscosity and WSS, were observed. Therefore, measured non-Newtonian viscosity might be possibly useful to obtain patient-specific hemodynamic and morphologic result.