센서 어레이를 이용한 휘발성유기화합물 측정기기 개발

홍철호,김동진,이장훈,권혁구 한국환경독성학회 2004 환경독성보건학회지 Vol.19 No.1

Air quality monitoring is a primary activity for industrial and social environment. The government push for pollutants that must be monitored. Especially, the VOCs(Volatile Organic Compounds), which are very harmful for human and environment, should be controlled under the government policy. We have been developed a VOCs measurement system which recognize various kinds and quantities of VOCs, such as benzene, toluene, and xylene(BTX). Especially, we designed sensor array with various kinds of gas sensor and ANN(Artificial Neural Network) algorithm. The measured values for BTX have errors of 1~4ppm.

산지유통센터(APC) 운영관리 프로그램을 이용한 정보화경영 방안

이호철,박재홍 한국농업정보과학회 2001 농업정보과학 Vol.3 No.1

이 연구는 산지유통센터의 경영에 있어 새로운 운영프로그램을 도입함으로써 경영의 정보화를 통하여 탄력적으로 기존의 패킹하우스 시설을 재활용할 수 있는 방안을 강구하고자 하였다. 산지유통센터의 운영을 전산화를 통하여 효율적으로 관리함으로써 산지유통센터의 수익성을 정확히 진단하고 이를 경영개선에 활용하고자 하는 것이다. 전산화된 산지유통센터 운영관리프로그램의 도입은 산지유통센터에게 그 운영에 필요한 경영정보를 신속?명확하게 제공함으로써 산지유통센터의 경영합리화에 기여할 것이며 산지유통센터의 과학적 경영전략의 수립 등으로 산지유통센터의 기능이 크게 강화될 것이다. 이는 결과적으로 그 동안 미약했던 패킹하우스 경영진의 효율적 경영노하우의 집적은 물론 정보화된 패킹하우스 운영을 가져올 것이다. 아울러 활용도와 권한이 증대된 패킹하우스는 생산자들의 집단적이고 효율적인 단합을 유도하여 시장에서의 거래교섭력을 강화하게 될 것이다. 이처럼 현행의 한계를 극복하고 새로운 지역농업의 발전을 도모하기 위해서라도 새로운 산지유통센터 운영관리 프로그램의 개발 및 도입은 이제 서둘러야만 할 것이다.

PCA와 ANN을 이용한 VOC 측정기기 개발

이장훈,권혁구,박승호,김동진,홍철호 한국환경독성학회 2004 환경독성보건학회지 Vol.19 No.2

Air quality monitoring is a primary activity for industrial and social environment. The government identifies the pollutants that each industry must monitor. Especially, the VOCs(Volatile Organic Compounds), which are very harmful to human body and environment atmosphere, should be controlled under the government policy. However, the VOCs, which have not been confirmed in emission sources are very difficult to monitor. It is needed to develop the monitoring system that allow the continuous and in situ measurement of VOCs mixture in different environmental matrices. Gas chromatography and mass spectrometry are the most prevalent current techniques among those available for the analysis of VOCs. But, they need a large size analytical instrument, which costs a great deal for purchase and operation. In addition, it has some limitations for real time environmental monitoring such as location problems and slow processing time. Recently, several companies have commercialized a portable VOCs measurement systems, which cannot classify various kinds of VOCs but total quantities. We have developed a VOCs measurement system, which recognizes various kinds and quantities of VOCs, such as benzene, toluene, and xylene(BTX). Also, it can be used as a stand-alone type and/or fixed type in the vehicle with rack for real-time environmental monitoring.

C-type의 소형 고성능 Solenoid RF Chip 인덕터의 설계 및 구현에 관한 연구

홍철호(Chol-Ho Hong),김재욱(Jae-Wook Kim),이태범(Tae-Bum Lee),윤의중(Eui-Jung Yun),김용석(Yong-Seok Kim),정영창(Young-Chang Jung) 대한전자공학회 2002 대한전자공학회 학술대회 Vol.2002 No.6

김철원 교수 정년퇴임 기념호 : 논문집 ; 세계 우수 탁구 선수의 경기내용 분석

홍철호 ( Chol Ho Hong ),이창준 ( Chang Joon Lee ) 제주대학교 체육과학연구소 2000 체육과학연구 Vol.6 No.-

Design of a Charge Equalizer Based on Battery Modularization

Hong-Sun Park,Chol-Ho Kim,Ki-Bum Park,Gun-Woo Moon,Joong-Hui Lee IEEE 2009 IEEE Transactions on Vehicular Technology VT Vol.58 No.7

<P>The charge equalizer design for a series-connected battery string is very challenging because it needs to satisfy many requirements, such as implementation possibility, equalization speed, equalization efficiency, controller simplicity, size and cost issues, voltage and current stress, and so on. Numerous algorithms and circuits were developed to meet the foregoing demands, and some interesting results have been obtained. However, for a large number of cells, for example, 80 or more batteries, the previous approaches might not easily satisfy the foregoing requirement. To overcome these difficulties, we propose a charge equalizer design method based on a battery modularization technique. In this method, a very long battery string is divided into several modules, and then, an intramodule equalizer and an outer-module equalizer are designed. This battery modularization scheme effectively reduces the number of cells that we consider in an equalizer design procedure; thus, the design of a charge equalizer becomes easier. Furthermore, by applying the previously verified charge equalizers to the intramodule and the outer module, we can make the equalizer design more flexible. Several examples and experimental results are presented to demonstrate the usefulness of the charge equalizer design method.</P>

Analysis Results of KOMPSAT-1 Data Distribution

Chol, Gi Hyuk,Lee, Joo Hee,Song, Hyun Sook,Kim, Youn Soo,Jeon, Gab Ho,Jun, Jung Nam,Lim, Hyo Suk,Paik, Hong Yul 대한원격탐사학회 2000 International Symposium on Remote Sensing Vol.16 No.1

In this paper, we describe the analysis results from Korea Multi-Purpose Satellite-1 (KOMPSAT-1) data distribution during a normal operation period of time. Satellite operation and application center of KARI has distributed Electro-Optical Camera (EOC), Ocean Scanning Multi-spectral Imager (OSMI) and Space Physics Sensor (SPS) data to public users since KOMPSAT-1 was launched. KAKI is doing his best effort to offer good service to public users up to the present. Analysis of data distribution result is for the purpose of effective use and application of KOMPSAT-1 data. The main fields of analysis are the methods of data distribution, analysis of user group, fields of KOMPSAT-1 data utilization and application, market analysis of KOMPSAT-1 data, etc. KAKI is trying to establish effective distribution system of KOMPSAT-1. data for public users based on this analysis.

Replication of the Wellcome Trust genome-wide association study on essential hypertension in a Korean population

Hong, Kyung-Won,Jin, Hyun-Seok,Cho, Yoon Shin,Lee, Jong-Young,Lee, Jong-Eun,Cho, Nam H,Shin, Chol,Lee, Sang-Ho,Park, Hun Kuk,Oh, Bermseok Springer Science and Business Media LLC 2009 Hypertension research Vol.32 No.7

<P>Essential hypertension has a high rate of morbidity and mortality, primarily because of the associated complications. The Wellcome Trust Case Control Consortium recently conducted a genome-wide association study and identified six single nucleotide polymorphisms (SNPs) associated with essential hypertension. The Family Blood Pressure Program later investigated these six SNPs in an attempt to reproduce the aforementioned associations, but only one such association was found. However, this replication study did not include any Asian patients. Therefore, we investigated the association of the six SNPs with hypertension using 7551 unrelated individuals from the Korean Association REsource, a genome-wide association study based on epidemiological cohorts in Korea. We carried out a logistic regression analysis for hypertension status, and a linear regression analysis with systolic blood pressure and diastolic blood pressure as quantitative traits. Even though two SNPs, rs6997709 and rs7961152, were associated with systolic and diastolic blood pressures, respectively, in the quantitative trait association test, no associations were found using a case-control association test. The Korean Association REsource data consisted of two community cohorts (the Ansung and Ansan areas in Korea). The SNP rs7961152 was found to be associated with hypertension risk (OR (odds ratio) =1.286, CI (confidence interval) 1.012-1.636, P=0.040), but only in the Ansan cohort. This study as well as the Family Blood Pressure Program study show that because of the complexity of the genetic architecture, an association study with a larger sample population may be necessary to identify genetic variants that affect hypertension.</P>

A Modularized Charge Equalizer for an HEV Lithium-Ion Battery String

Hong-Sun Park,Chong-Eun Kim,Chol-Ho Kim,Gun-Woo Moon,Joong-Hui Lee IEEE 2009 IEEE transactions on industrial electronics Vol.56 No.5

<P>Based on the fact that a hybrid electric vehicle (HEV) connects a high number of batteries in series to obtain more than approximately 300 V, this paper proposes a modularized charge equalizer for an HEV battery pack. In this paper, the overall battery string is modularized into <I>M*N</I> cells, where <I>M</I> is the number of modules in the string and <I>N</I> is the number of cells in each module. With this modularization, low voltage stress on the electronic devices can be achieved, which means that there is less chance of a failure on the charge equalizer. The power rating selection is one of the most important design issues for a charge equalizer because it is very closely related to equalization time. To solve this problem optimally, this paper presents a power rating design guide. In addition, this paper considers system-level design issues, such as cell voltage acquisition, equalizer control logic, and system-level grounding. The simulation and experimental results are presented to show the usefulness of the optimal power rating selection guide and the low voltage stressed charge equalization process.</P>

Charge Equalization Converter with Parallel Primary Winding for Series Connected Lithium-Ion Battery strings in HEV

Chol-Ho Kim,Hong-Sun Park,Chong-Eun Kim,Gun-Woo Moon,Joong-Hui Lee,Jeon Keun Oh 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-

In this paper, a charge equalization converter with parallel-connected primary windings of transformers is proposed. The proposed work effectively balances the voltage among Lithium-Ion battery cells despite each battery cell has low voltage gap compared with its SOC. The principle of the proposed work is that the equalizing energy from all battery strings moves to the lowest voltage battery through the isolated dc/dc converter controlled by the corresponding solid state relay switch. In this paper, a prototype of four Lithium-Ion battery cells is optimally designed and implemented, and experimental results show that the proposed method has excellent cell balancing performance.