Poster Session : PS 0831 ; Upper GI Tract : Clinical Factors to Predict Angiographically Detectable Non-Variceal Upper Gastrointestinal Bleeding in Patients Refractory to Endoscopic Treatment

( Tae Hwan Ha ),( Tae Hoon Oh ),( Sung In Yu ),( Min Kim ),( Jong Wook Kim ),( Won Ki Bae ),( Jae Hyung Kim ),( Seung Suk Baek ),( Mi Jin Ryu ),( Ye Na Choi ),( Ji Young Park ),( Eileen L Yoon ),( Tae 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Background: Non-variceal upper GI bleeding (NVUGIB) is a common medical problem that has signifi cant association with morbidity and mortality. Angiographic detection and subsequent transarterial embolization (TAE) is a primary treatment option when medical and endoscopic treatments fail. We investigated clinical factors that could affect the success of the angiographic detection and prognosis after TAE in patients with NVUGIB refractory to endoscopic therapy. Methods: A retrospective analysis of the clinical data was done in patients with failed endoscopic treatment who underwent angiography for the treatment of acute NVUGIB between May 2002 and May 2013. Patients were divided into detection or non-detection groups according to the presence of bleeding stigmata in angiographic fi nding. Rebleeding defi ned as subsequent bleeding event within 7 days and mortality within 30days were analyzed as outcome parameters after TAE following detection in angiography. Results: A total 45 patients 37 (male, mean age, 65.9±14.9 years) were analyzed and classifi ed as a detection group (n=25, 55.5%) and non-detection group (n=20, 44.6%). Peptic ulcers were the most common cause of refractory NVUGIB. Larger transfusion amount (5.7±3.9 unit vs. 3.5±2.8 unit; P=0.03), prolonged aPTT level (34.2±17.3 sec vs. 21.8±13.8 sec; P=0.01) and short time interval between last endoscopy and angiography (17.5±25.9 hours vs. 34.3±59.5 hours; P=0.04) were found to be signifi cant factors for predicting angiographic detection. TAE was performed in all patients detected in angiography. Rebleeding (44%) was significantly associated with higher Rockall score (8.3±1.5 vs. 6.6±2.4; P=0.046) and mortality (12%) was signifi cantly associated with higher Rockall score (9.3±0.6 vs. 7.1±2.2; P=0.002) and higher level of BUN (55.3±47.4 vs. 27.6±17.4; P=0.01). Conclusions: Clinical characteristics associated with angiographic detection in patients with NVUGIB refractory to endoscopic therapy were severe bleeding, bleeding tendency and early angiographic intervention. The Rockall score is useful parameter for predicting rebleeding and mortality after TAE.

Simulation of Mobile Robot Navigation based on Multi-Sensor Data Fusion by Probabilistic Model

Tae?seok Jin 한국산업융합학회 2018 한국산업융합학회 논문집 Vol.21 No.4

Presently, the exploration of an unknown environment is an important task for the development of mobile robots and mobile robots are navigated by means of a number of methods, using navigating systems such as the sonar-sensing system or the visual-sensing system. To fully utilize the strengths of both the sonar and visual sensing systems, In mobile robotics, multi-sensor data fusion(MSDF) became useful method for navigation and collision avoiding. Moreover, their applicability for map building and navigation has exploited in recent years. In this paper, as the preliminary step for developing a multi-purpose autonomous carrier mobile robot to transport trolleys or heavy goods and serve as robotic nursing assistant in hospital wards. The aim of this paper is to present the use of multi-sensor data fusion such as ultrasonic sensor, IR sensor for mobile robot to navigate, and presents an experimental mobile robot designed to operate autonomously within indoor environments. Simulation results with a mobile robot will demonstrate the effectiveness of the discussed methods.

Targeting Multiple Myeloma Cell Death with Polyphenol EGCG

Tae‐Hoon Lee,Hee‐Young Yang,Hoon‐In Choi,Ung Yang,Kyoung‐Jin Chung,Lina Ren 한국동물생명공학회(구 한국동물번식학회) 2011 발생공학 국제심포지엄 및 학술대회 Vol.2011 No.1

(‐)‐Epigallocatechin 3‐gallate (EGCG) is a potent antioxidant polyphenol in green tea that acts as an anticancer agent via both direct and indirect pathways. Although the relationship between EGCG’s anticancer effects and its antioxidant activity is not fully understood, it is known that EGCG stimulates production of reactive oxygen species (ROS), which induce oxidative stress leading to cell death. In IM9 multiple myeloma cells, EGCG acted in a dose‐ and time‐dependent manner to induce apoptotic cell death. Among the antioxidant enzymes expressed in IM9 cells, levels of peroxiredoxin (Prdx) V were selectively and significantly reduced by EGCG. Moreover, the ROS scavenger NAC completely inhibited EGCG‐induced apoptosis and PrdxV reduction, while overexpression of PrdxV, but not a PrdxVC48S mutant, protected IM9 cells from EGCG‐induced apoptosis. EGCG‐induced reductions in cell viability and PrdxV levels were also observed in primary CD138+ multiple myeloma cells from patients. These results suggest that PrdxV is a key target via which EGCG mediates its anticancer effects.

Study on Reliability Improvement of Voltage Transformers by Increasing Voltage Factor

Tae‑Sik Kong,Hee‑Dong Kim,Hung‑Sok Park,Soo‑Hoh Lee,Soon‑Yong Kim,Pil‑Bum Joung,Jin‑Yeub Park 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3

Voltage transformers (VTs) must be highly reliable as they are essential components of the electric power industry. VT failures can cause a signifcant impact for important facilities such as nuclear power plants. In fact, VTs which passed the international standard, were damaged and sometimes resulted in the shutdown of the nuclear power plants. In order to improve the reliability, VTs with various iron core was studied. The electromagnetic feld simulation, a saturation characteristics test, and an overvoltage breakdown test were conducted. The result shows that the magnetic fux density signifcantly afects the reliability of VTs. To increase the reliability of VTs, it is required to reduce the magnetic fux density by increasing the knee-point and voltage factor. Owing to limited installation space, increasing the size of the iron core is difcult. Instead, VT by decreasing the thickness of the conductor and increasing the number of turns, it was possible to reduce the magnetic fux density without the size change. Therefore, improved VTs were obtained by decreasing the thickness of the conductor and increasing the number of turns, and the improved reliability was verifed through a comparison test with existing VTs. The fabricated VTs shows a signifcantly higher saturation voltage and breakdown time than existing VTs. Thus, by proposed VTs can contribute the stable operation of the nuclear power plant and improve the manufacturer’s quality.

IGCC용 고온건식탈황제 개발의 현황과 전망

이태진,임창진,이태곤 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.17 No.2

석탄가스화복합발전(Integrated Cial Gasification Combined Cycle: IGCC) 시스템은 가장 유망하고 진보된 발전시스템 중의 하나이다. 일반적으로 석탄가스화로, 가스 정제시스템 및 터어빈으로 구성되는 IGCC 공정에서 가스 정제시스템의 일부분인 재생가능한 탈황제에 의한 H2S 및 COS의 흡수는 매우 중요한 단위공정이다. 적합한 재생성 있는 탈황제의 개발은 IGCC 시스템을 위한 고온가스 정제 프로그램에서 핵심적 요소기술이다. 많은 연구자들에 의한 탈황제의 광범한 연구의 결과로부터 현재수준에서는 zinc titanate 탈황제가 가장 우수한 탈황제고 판명되어 있다. 이 논문의 목적은 높은 열효율을 가지는 IGCC용 고온건식 탈황제의 현재 개발동향과 전망을 정리해보는 것이다. 특히 국내에서의 탈황제에 관한 현제의 기술수준과 장래의 계획에 초점을 맞추어 기술하고자 한다 The IGCC(Integrated Coal Gasification Combined Cycle) system is one of the most promising advanced power system. In the IGCC process that generally consists of cial gasifier, gas cleanup system and turbines, the absorption of H2S and COS by regenerable desulfurization sorbents as a part of the gas cleanup system is a very important unit process. Develpment of a suitable regenerable sorbents is a major barrier issue in the hot gas cleanup program for IGCC systems. From the results of the extensive works on the sorbents by many authors, zinc titanate is presently the leading candidate sorbent. The objective of this paper is to review the current development status and prospect on high temperature desulfurization sorbents for IGCC with high thermal efficiency. Much attention is focused on the state of the art and future plan for development of desulfurization sorbents in Korea.

分散制御 시스템에서 開放化 構造說計

김내진,김진태,최진석 건국대학교 1996 대학원 학술논문집 Vol.43 No.-

최근 각종 제어시스템에 분산제어 시스템을 이용하는 경우가 늘고 있는데, 각 플랫폼에 따른 호환성 결여로 인하여 여러 가지 문제가 야기되고 있다. 본 논문에서는 이러한 어려움을 극복하기 위하여 사용 환경에 관계없이 각 분산제어 시스템을 연결하고자 개방구조를 설계하였다. 이를 위하여 OSI 7 layer model을 따른 protocal을 개발하였으며, 이것을 RPC와 XDR을 이용하여 구현하였다. 전체 시스템은 속도와 호환성을 모두 고려하였지만, 속도와 호환성이 모두 문제가 되는 것은 호환성을 위주로 설계하였다. Recently, many kind of control system is implemented by DCS(Distributed Control System). But that situation the compatible problem between different flatform system is arised. In this paper, we are about to describe the design of the system that makes a user to satisfy scalability, portablility, interoperability which is the characteristic of the open structure in DCS using real time control theory and microprocessor applicable technique. For this, we developed a protocal that followed OSI 7 layer model, and implemented this protocol using RPC and XDR. The system is considered the speed and the compatibility, but in the case of some problems in compatibility and speed, out design is intented to choose compatibility.

(Ba0.5 Sr0.5 )TiO₃박막의 전기전도 기구에 관한 연구

김진철,진병태,김명호 國立 昌原大學校 産業技術硏究所 1999 産技硏論文集 Vol.13 No.-

Dielectric properties and conduction mechanism of BST thin film with a thickness 50 nm deposited by r.f. sputter were investigated. The crystal structure of thin film was cubic perovskite, and the BST film did not have any preferred orientations. Microstructure of the BST thin film was a well-known columnar grain structure. The dielectric constant was increased after post annealing up to 284 at 550℃. It was mainly due to the improvement of crystallinity of BST film. According to current-voltage(I-V) characteristics, I-V of BST was varied with deposition methods of top electrode and annealing temperatures. The activation energies in the range of low and high applied voltage were 0.2∼0.3 eV and 0.6∼0.9 eV, respectively. We could not consider that these energies were barrier heights between Pt and BST, and trap energies existing in BST film. Therefore, the conduction of BST film couldn't be explained the simple Schottky emission and/or Poole-Frenkel emission process.

RDBMS를 이용한 이중화 구조의 SCADA 시스템 설계

박기태,김진태,김내진 건국대학교 1997 학술논문집 : 건국대 대학원 Vol.45 No.1

Nowadays, we require the control system operated rapidly and - by developing of network and distributed control system - transparency, availability and reliability of the system. In addition, by developing of database system, we try to make management of control data more efficient and consistent. In this paper the system is designed to satisfy scalability, portability and interoperability in the part of data management in SCADA(Supervisory Control and Data Aquisition)system by using relational database. Hardware is made up of main computer unit, communication unit, control unit and a Ethernet data network Main computer unit has the function of supervisory for plant operating and diagnosis with man machine interface. Communication unit has the function of transfer of status information in the field. Control unit carry out the function of the plant control. Ethernet data network enables these unit above to exchange the information in high speed. For fault tolerance when critical error occurs in main computer unit, the function of main computer is changed to slave computer by failover and the control of system could be maintained.

ATM 망에서 ABR 트래픽을 제어하기 위한 EFCI 스위치와 ER 스위치의 혼합

김내진,김진태,박기태 건국대학교 1996 대학원 학술논문집 Vol.43 No.-

새로운 ATM 서비스인 ABR은 최근에 발생된 서비스 클래스이다. ATM 망에서 속도기반 흐름제어 방식은 목적지 또는 망 스위칭 노드에서 발생하는 RM셀들에 포함된 궤한정보를 기반으로하여 ABR트래픽 소스들의 전송속도를 제어하는 것이다. 결국 사용자에게 유용한 대역폭을 할당하는 것이다. ATM 망이 다른 속도제어 방식 즉, EFCI 모드와 ER방식을 사용하는 스위치로 구성되었을 때, 망성능과 대역폭 할당의 공정성에 관하여 연구하였다 ABR, new ATM service, is service class that currently was originated. The rate-based flow control mechanism in Asynchronous Transfer Mode(ATM) networks controls the transmission rate of Available Bit Rate(ABR) traffic sources, based on feedback information contained in the Resource Management(RM) cells coming from the destination and the network switching nodes. Finally by controlling traffic flow, available bandwidth to users is allocated. This paper investigates network performance and fairness of bandwidth allocarion When an ATM network consists of switches using different rate control mechanims, namely, the Explicit Forward Congestion Indication(EFCI) mode and the Explicit Rate(ER) mechanism

조팝나무 揷木時期 및 揷床土의 種類가 發根에 미치는 影響

趙鎭泰,尹汰,金泰重,洪承敏,白基燁 한국화훼연구회 1995 화훼연구 Vol.4 No.1

Cutting experiment was conducted to develop a mass propagation method for Spiraea prunifolia var. simpliciflora Nakai. The optimum season for hardwood cutting was between December and early April, but cutting could be done year-round by using rhizome. NAA treatment (100 ppm) was the most effective as rooting promoter. IBA and IAA were also found to be effective. The effect of sand, red clay, loam, silty loam and vermiculite had little differences in rooting especially when cuttings were done earlier than April 5.