화강암 풍화토의 동상 발현 및 융해에 따른 변형 거동에 관한 연구

류능환 ( Ryu Neung Hwan ),최중대 ( Choi Jung Dae ),류영선 ( Ryu Young Sun ) 한국농공학회 1995 韓國農工學會誌 : 전원과 자원 Vol.37 No.3

Natural ground is a composite consisted of the three phases of water, air and soil paircles. Among the three components, water as a material is well understood but soil particles are not in foundation engineering. Especially, weathered granite soil generally shows a large volumetric expansion when they freeze. And, the stability and durability of the soil have shown decreased with repetitive freezing and thawing processes. These unique charcteristics may cause various construction and management problems if the soil is used as a construction material and foundation layers. This project was initiated to investigate the soil's physical and engineering characteristics resulting from freezing and freezing-thawing processes. Research results may be used as a basic data in solving various problems related to the soil's unique characteristics. The following conclusions were obtained: The degree of decomposition of weathered granite soil in Kangwon-do was very different between the West and East sides of the divide of the Dae-Kwan Ryung. Soil particles distributed wide from very coarse to fine particles. Consistency could be predicted with a function of P₂₀₀ as LL=0.8 P₂₀₀+20. Permeability ranged from 10^-2 to 10^-4cm/sec, moisture content from 15 to 20% and maximum dry density from 1.55 to 1.73g /cm³ By compaction, soil particles easily crushed, D₅₀ of soil particles decreased and specific surface significantly increased. Shear characteristics varied wide depending on the disturbance of soil. Strain characteristics influenced the soil's dynamic behviour. Elastic failure mode was observed if strain was less than 10^-4/s and plastic failure mode was observed if strain was more than 10^-2/s. The elastic wave velocity in the soil rapidly increased if dry density became larger than 1.5g /cm³ and these values were V_p=250, V_g=150, respectively. Frost heave ratio was the highest around 0℃ and the maximum frost heave pressure was observed when deformation ratio was less than 10% which was the stability state of soil freezing. The state had no relation with frost depth. Over freezing process was observed when drainage or suction freezing process was undergone. Drainage freezing process was observed if freezing velocity was high under confined pressure and suction frost process was occurred if the velocity was low under the same confined process.

일차성 흉곽내 갑상선종 : 1예 보고

이미경,류대웅,이삼윤,최순호 원광대학교 의과학연구소 2009 圓光醫科學 Vol.24 No.1

Intrathoracic goiter consist of two types, namely, the primary intrathoracic goiter and secondary intrathoracic goiter. Primary intrathoracic goiters are very rare. Fifteen to fifty percent of these patients are asymptomatic. Symptoms, when present, are usually the result of tracheal or esophageal compression. Standard chest roentgenograms are often diagnostic but computed tomographic or radioactive iodine scans may be helpful. In symptomatic patients or those in whom explorations are undertaken for diagnostic purpose or exclude carcinoma, surgical removal is indicated. We report here on a case that was completely removed with using the thoracoscopic assist technique. The postoperative courses were uneventful.

반코마이신 내성 장내구균 분리 환자에서 황색포도알균의 내성

김동욱,신선혜,김혜진,류선,이선희,장철훈,김영대,곽임수 대한감염학회 2004 감염과 화학요법 Vol.36 No.1

목적 : Vancomycin-resistant enterococci (VRE)로부터 S. aureus로의 vacomycin 내성 유전자의 전파는 오래전부터 예견되어져 왔으며 큰 걱정거리로 남아있다. 최근에 vanA 유전자를 가지고 있는 vancomycin-resistant S. aureus 2주가 미국에서 분리되었다. 이 연구의 목적은 VRE를 보균하고 있는 환자들에서 S. aureus 보균양상과 항균제 내성을 알아보는데 그 목적이 있다. 재료 및 방법 : 2001년 1월부터 2001년 12월까지 부산대학교병원에 입원하였던 환자들 중 임상검체에서 VRE가 분리된 환자 7명과 2001년 9월부터 12월까지 외과 중 환자실에 입원하였던 환자들 중 VRE 감시배양을 시행하였던 20명의 환자들을 대상으로 하였다. 환자들은 전비공, 액와부, 회음부, 직장에서 매주 면봉으로 검체를 채취하였다. 선별배지에서 검체를 배양하여 S. aureus를 분리하였고 원판 확산법을 이용하여 methicillin 감수성을 측정하였다. Broth microdilution 법으로 vancomycin MIC를 측정하였다. 결과 : 총 27명에서 73회의 방문과 292회의 배양이 시행되었으며 총 67주의 S. aureus가 분리되었다. 이중 64주(95.5%)가 methicillin 내성이었다. 전비공 MRSA 보균율은 VRE를 보균하고 있었던 환자는 19명 중 11명(58%)에서, VRE를 보균하지 않았던 환자는 8명 중 3명(37.5%)으로 VRE 보균자에서 보균율이 더 높았다. 총 64주의 MRSA의 vancomycin MIC의 분포는 0.5-2㎍/mL였으며 2㎍/mL를 초과하는 균주는 발견되지 않았다. 64주 중 vancomycin MIC가 1㎍/mL인 균주가 54주(84.4%)로 가장 많았으며 2㎍/mL 6주(9.4%), 0.5㎍/mL 4주(6.3%)의 순이었다. 결론 : VRE 환자에서 S. aureus의 보균율은 비보균자 보다 높았으며 분리된 균주들은 대부분 MRSA였다. VRSA 균주는 발견되지 않았다. Background : The transfer of vancomycin resistance from vancomycin-resistant enterococci (VRE) to Staphylococcus aureus has been predicted. The purpose of this study is to determine the prevalence and antibiotics resistance of S. aureus among patients colonized with VRE. Methods : Between January 2001 and December 2001, a prospective study was performed at Pusan National University Hospital on 27 patients. Surveillance swabs from nasal cavity, axilla, perineum, and rectum were obtained at weekly intervals. Methicillin susceptability of S. aureus was determined by oxacillin disk diffusion test and minimum inhibitory concentration (MIC) for vancomycin by microdilution broth test. Results : Total of 292 swab cultures were performed and 67 S. aureus isolates were collected. 64 isolates (95.5%) were resistant to methicillin. The prevalence of nasal MRSA carrier in 19 patients colonized with VRE was higher than that in 8 patients not colonized with VRE (58% vs. 37.5%). In 64 MRSA isolates, MIC (㎍/mL) for vancomycin ranged from 0.5 to 2. No isolates with MIC >2 ㎍/mL were observed. MIC of 1 ㎍/mL was shown (observed) in 54 isolates, 2 ㎍/mL in 6 isolates, and 0.5 ㎍/mL in 4 isolates. Conclusion : The prevalence of S. aureus with colonization of VRE is higher than that without colonization of VRE. Most of S. aureus isolates were resistant to methicillin. VRSA isolates were not observed.

Missile Autopilot Design for Agile Turn Control During Boost-Phase

Ryu, Sun-Mee,Won, Dae-Yeon,Lee, Chang-Hun,Tahk, Min-Jea The Korean Society for Aeronautical and Space Scie 2011 International Journal of Aeronautical and Space Sc Vol.12 No.4

This paper presents the air-to-air missile autopilot design for a $180^{\circ}$ heading reversal maneuver during boost-phase. The missile's dynamics are linearized at a set of operating points for which angle of attack controllers are designed to cover an extended flight envelope. Then, angle of attack controllers are designed for this set of points, utilizing a pole-placement approach. The controllers' gains in the proposed configuration are computed from aerodynamic coefficients and design parameters in order to satisfy designer-chosen criteria. These design parameters are the closed-loop frequency, damping ratio, and time constant; these represent the characteristics of the control system. To cope with highly nonlinear and rapidly time varying dynamics during boost-phase, the global gain-scheduled controller is obtained by interpolating the controllers' gains over variations of the angle of attack, Mach number, and center of gravity. Simulation results show that the proposed autopilot design provides satisfactory performance and possesses good [ed: or "sufficient" or "excellent"] capabilities.

Assessment of Psoas Muscle Thickness for Predicting Long-term Mortality in Cirrhotic Patients with Ascites

Sun Min Kim,Tae Yeob Kim,Joo Hyun Sohn,Ji Yeoun Kim,Jeongsuk Kim,Dae Won Jun,Min Yeong Kim,Jeong Ah Ryu,Sanghyeok Lim,Jae Yoon Jeong 한국간담췌외과학회 2014 한국간담췌외과학회 학술대회지 Vol.2014 No.4

[P1-06] Characterization of the Cucumber Mosaic Virus Coat Protein Expressed in a Genetically Modified Pepper and a E. coli System for Biosafety Assesment

Sun-Nye Bang,Yu-Sun Jung,Geun-Bae Kim,Kyu-Hwan Chung,Gung-Pyo Lee,Chan Lee,Dae-Yeul Son,Kwen-Woo Park,Jing-Sung Hong,Ki-Hyun Ryu 한국식품영양과학회 2009 한국식품영양과학회 학술대회발표집 Vol.2009 No.11

HBV : A New Prognostic Model for 6-months Mortality in Patients with Decompensated Hepatitis B Virus-Related Liver Cirrhosis

( Dae Hoe Gu ),( Min Seon Park ),( Tae Jung Yun ),( Seok Bae Yoon ),( Sun Young Yim ),( Jin Yong Jung ),( Jin Dong Kim ),( Yeon Seok Seo ),( Hyung Joon Yim ),( Soon Ho Um ),( Ho Sang Ryu ),( Yun Ji Pa 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1

Background: The use of antiviral agent has changed the prognosis of patients with hepatitis B virus (HBV)-related end stage liver disease. In these patients, therefore, a more efficient prognostic model for determining early mortality is necessary to properly select those who require liver transplantation. In this study, we aimed to develop a new prognostic model. Methods: We retrospectively analyzed a total of consecutive 194 patients with decompensated HBV-related liver cirrhosis (≥CTP score 7, ascites, or jaundice) who had initially started antiviral treatment in Korea university Anam hospital. Univariate and multivariate cox-regression modeling was used to develop a model for predicting 6-month mortality Results: The study population was predominantly male (128/194) and median age was 51 years. Antiviral agents were administered for a median of 41 months (lamivudine in 157 patients, entecavir in 37). At baseline 147 and 12 patients had ascites and encephalopathy, respectively, with a mean CTP score of 9. Twenty-one (10.8%) patients died within the first 6 months of treatment. Univariate analysis revealed that baseline variables such as age, the presence of ascites or encephalopathy, serum bilirubin, prothrombin time, albumin, Na, BUN, alkaline phosphatase, and HBV DNA levels were associated with the deaths within 6-months (all P<0.05). Among them serum bilirubin, prothrombin time, HBV DNA levels and age were found to be independent risk factors in multivariate analysis. Using these four risk factors, we developed new scoring system to predict 6-months mortality. This new prediction model showed AUROC of 0.941, higher than those of CTP score and MELD score which were 0.893 and 0.862, respectively. Conclusions: This newly developed prediction model for early mortality will be useful in selecting the candidates of urgent liver transplantation in patients with decompensated HBV-related liver cirrhosis.

Induction of sexual maturation in female eels Anguilla japonica by recombinant eel gonadotropin produced in CHO cell

Dae-Guen Kim,Hyo-Won Kim,Jung-Hyun Kim,Yong-Woon Ryu,Shin-Kwon Kim,Bae-Ik Lee,Je-Cheon Jun,Sun-Mee Hong,Kwan-Sik Min,Dae-Jung Kim 한국수산과학회 양식분과 2018 한국수산과학회 양식분과 학술대회 Vol.2018 No.5

A Secure Energy-Efficient Dynamic Multi-Path Routing Protocol for WSN (SE²DMRP)

Sun-jip Kim,Dae-hyun Ryu,Seung-jung Shin 한국멀티미디어학회 2010 한국멀티미디어학회 국제학술대회 Vol.2010 No.-

Wireless sensor networks (WSN) are typically located at the center of any infrastructure and are arbitrarily deployed without an administrator to the gather the data collected by wireless sensor nodes. This environment is such that resources such as energy and processing power are limited. Therefore, due to these constraints and the dense distribution of sensor nodes, it is very difficult to provide security in the data transfer between sensor nodes. Accordingly, to solve this problem taking into account the limited resources and security issues inherent to sensor nodes, we propose SE² DMRP which is an algorithm where the BS(Base Station) selects a logical hierarchical routing multi-path and is capable of incorporating any recent WSN security algorithm. In SE² DMRP the base station (BS) selects a multi-path route between sensor nodes within the area that is managed by the BS and AN (Aggregation Node) or by the AN only. This process is based on information in each sensor node. SE² DMRP offers provides security to communication between sensor nodes by incorporating a recently proposed encryption algorithm. Accordingly, SE² DMRP provides multi-path service offering security and energy efficiency, thereby being able to effectively cope with specific security attacks, and increasing the overall network lifetime.

The ORFEUS Survey of Interstellar Molecular Hydrogen

Dae-Hee Lee,W. Van Dyke Dixon,Mark Hurwitz,Kwang-Sun Ryu,Kwang-Il Seon,Kyoung-Wook Min 한국우주과학회 1999 한국우주과학회보 Vol.8 No.2