• 한국가시화정보학회지
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• 제20권3호
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• pp.86-93
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• 2022

An electrostatic precipitator (ESP) is an industrial post processing facility for high efficiency dust mitigation. Uniformity of the flow passing through the inlet duct leading into the main chamber is important for efficient reduction of dust. To examine flow uniformity, this study conducted a numerical analysis of the flow within a scale-down ESP inlet duct. Magnetic resonance velocimetry (MRV) results from a prior study were utilized to validate the Reynolds-averaged Navier-Stokes (RANS) numerical simulations. Both the experimental and computational results displayed a similar recirculation zone shape and normalized velocity profile near the duct outlet for the baseline geometry. To optimize the uniformity of the flow, the number of guide vanes was modified, and the guide vanes were partially extended straight upward. Design evaluation is done based on the outlet velocity distribution and mass flowrate balance between the two outlets. Simulation results indicate that the vane extension is critical for flow optimization in curved ESP ducts.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2005년도 창립60주년 기념 추계 학술대회
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• pp.182.2-182.2
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• 2005

• 한국언어정보학회:학술대회논문집
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• 한국언어정보학회 2001년도 학술대회 논문집
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• pp.185-197
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• 2001

It is quite burden-some for non-native speakers of English to write and read more and more IT-related reports due to the rapid development of IT technology. Thus, this study aims at designing ESP materials by using huge volume of electronic ITU texts, corpora and concordancer SW. Various tests are designed to study the usage of articles, hyponym, agreement, synonym, and others. The results of this study will bring general and practical benefits to technical English writing and improving IT area students' lexical knowledge of actual English usage. The ESP materials produced by this study will also make an extensive contribution to other industries and academic areas in Korean society.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2001년도 봄 학술발표논문집 Vol.28 No.1 (A)
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• pp.421-423
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• 2001

IPSec(IP Security)은 데이터가 공개적으로 전송되는 네트워크 데이터에 암호화와 인증, 무결성을 제공하기 위해 사용되는 프로토콜이다. IPSec 안에는 여러 프로토콜이 있는데, 그 중에 실제 패킷에 암호화와 인증, 무결성을 추가해 전달하기 위해서는 ESP(Encapsulation Security Payload)라는 프로토콜이 사용된다. 이 ESP(Encapsulation Security Payload)라는 프로토콜이 사용된다. 이 ESP는 패킷을 암호화하기 위해 DES-CBC 모드를 사용하는데, 여기에서 IV(Initialization Vector) 값이 쓰인다. 이 값은 패킷 복호화를 하기 위해 공개적으로 전달이 되기 때문에 중간에 공격자에 의해 공격 당할 위험이 많다. 본 논문에서는 IV 공격을 방지하기 위해 IV의 값을 해쉬 함수를 통해 한번 해슁을 한 다음에, IV 값을 안전하게 전달하는 방법을 제시하고자 한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 C
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• pp.1951-1953
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• 2004

In this study, we propose a small high voltage power supply which use a half-bridge ZCS resonant and Cockroft-Walton on circuit, for ESP (Electrostatic Precipitator). This power supply transfers energy from ZCS resonant inverter to step-up transformer and the transformer secondary is applied to the Cockroft-Walton circuit for generating high voltage as discharging source of electrodes. It is highly efficient because its amount of switching losses are reduced by virtue of the current resonant half-bridge inverter, and also due to the small size, low parasitic capacitance in the transformer stage owing to the low number of winding turns of the step up transformer secondary combined with the Cockroft-Walton circuit. From these results, the best operational condition is obtained at the switching frequency of 9 kHz and the duty ratio of 50 % in this ESP.

• 한국산업정보학회논문지
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• 제7권5호
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• pp.29-38
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• 2002

본 논문에서는 IPv6, ATM 및 IP/ATM에서의 보호에 관하여 기술한다. IPv6에서는 보호서비스를 제공하기 위하여 인증 헤드와 ESP를 사용하고 있으며 이러한 인증 헤드와 ESP에서의 보호서비스 제공에 관하여 기술한다. ATM에서의 보호체계는 ATM포럼에서 지금까지 연구한 AIM보안 규격 내용을 보호서비스 측면에서 소개한다. 또한, IP/ATM의 특성을 고려하여 IF/ATM에 적합한 보호서비스와 보호기술들을 기술한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.511-514
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• 2005

This paper propose an advanced control strategy to improve vehicle handling and directional stability by integrating Active Front Steering(AFS) with Electronic Stability Program(ESP) . The effect of the integrated control system on the vehicle handling characteristics and directional stability is studied through a close loop computer simulation of and eight degree of freedom nonlinear vehicle model and driver model. Simulation results confirm the effectiveness of the proposed control system and the overall improvements in vehicle handling and directional stability

• 한국환경과학회지
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• 제7권4호
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• pp.505-510
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• 1998

This study has been carried out to investigate Electrostatic Precipitator's(ESP) performance enhancement and removal efficiency of fine particle according to (NH4)2SO4injection rate. The following conclusions are derived from the these test results : 1) For plant condition cases, according to the variation of concentration agent [(NH4)2SO4]-10ppm, when inlet dust loading was 2g/m2. And when Inlet dust loading was 3g/m", that was increased to 98 19% 99.16% 99.23%, 99.58%, 2) It Is seen from thins experiments that the increasing 30ppm concentration of (NH4)2SO4 increase the collection efficiency and fine particle omission control.

• 한국농촌건축학회논문집
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• 제7권1호
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• pp.121-128
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• 2005

This experimental study was conducted to investigate beam strengthening of RC buildings with expended steel plate(ESP) in rural area. Nine test specimens were manufactured, whose variables were tensile steel ratio and the amount and the shape of expanded steel plate. The test results indicated that strengthened beams with ESP showed the improvement of flexural strength of 50%~90%, and the beam strengthening of U type was excellent for shear reinforcement as well as flexural reinforcement, more over, the honeycomb shape of ESP and anchor bolts for development of ESP were very effective.

• Journal of Advanced Marine Engineering and Technology
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• 제31권8호
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• pp.904-910
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• 2007

In this study an experimental research has been conducted to reduce NOx and smoke emission from diesel engine exhaust gas simultaneously by application of corona discharge type electrostatic precipitator(ESP). The ESP was installed between exhaust gas silencer and outlet terminal of exhaust gas system. The operating conditions as input parameters taken in this experiment were corona power input, gas velocity and equivalence ratio of gas. It was found that the corona discharge type ESP has notable effect on reducing smoke in exhaust gas but appeared to bring slight effect on reducing NOx.