원위치 철산화물 반복합성법을 이용한 토양 내카드뮴 안정화 효율 향상 및 현장 실증

이호섭,정슬기,안진성,김대호,박광진,남경필 한국지하수토양환경학회 2025 지하수토양환경 Vol.30 No.5

In situ iron (Fe) oxide synthesis is an effective chemical precipitation technique for heavy metal stabilization incontaminated soils. However, surface-adsorbed metals remain vulnerable to remobilization under changing environmentalconditions. Aqueous Cd stabilization experiments demonstrated that repetitive synthesis progressively reduced the surfaceadsorbed Cd fraction from 68.7 ± 1.0% (1st synthesis) to 53.9 ± 2.6% (2nd synthesis) and 23.5 ± 0.8% (3rd synthesis),while single synthesis with equivalent Fe showed no such reduction. Aberration-corrected scanning transmission electronmicroscopy (Cs-TEM) with energy dispersive spectroscopy (EDS) line scanning revealed that surface-adsorbed Cdmigrated from edge sites to bulk sites during repetitive synthesis, confirming physical encapsulation by newlyformed Fe oxide layers. Fast Fourier Transform (FFT) analysis indicated lattice distortion in Fe oxide structures,suggesting simultaneous incorporation mechanisms. Stabilization of Cd in soil experiments revealed that stabilization efficiencystrongly depended on the Fe/Cd molar ratio in soil solution, with ratios >400 achieving 99% reduction in Cdleachability through single synthesis via discrete Fe oxide formation, while lower ratios (Fe/Cd = 63) requiredrepetitive synthesis to achieve enhanced stabilization through progressive encapsulation mechanisms. Field demonstrationvalidated the practical applicability, achieving complete suppression of Cd leaching in most soil depths after twosynthesis cycles. This study establishes repetitive in situ Fe oxide synthesis as a viable remediation strategy for Cdcontaminated soils.

위성통신 시스템에서 이동형 위성단말을 위한 개루프 전력제어 알고리즘

이호섭,박형원,윤원식,Lee, Ho-Sub,Park, Hyung-Won,Yoon, Wonsik 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.9

In this paper, we propose an open loop power control algorithm to control transmission power of the On-The-Move(OTM) Satcom terminal in GEO satellite communication environment. The proposed algorithm identifies the current channel state restricted by an obstacle or an antenna depointing loss based on the received beacon signal strength. On the basis of the determined signal attenuation causes, the OTM Satcom terminal turns off the RF output when an antenna tracking is failed. If the OTM Satcom terminal experiences a channel blockage by an obstacle, the terminal spreads the transmit data to increase data reception probability. To evaluate the performance of the proposed algorithm, we compare an adjacent satellite interference level and an outage probability. The results show the performance of the proposed algorithm is better than that of the conventional algorithm.

구기자(枸杞子) 추출물이 납 투여(投與)에 의한 흰쥐의 신장(腎臟) 손상(損傷)에 미치는 영향(影響)

이호섭,한성희,한상환,Lee, Ho-Sub,Han, Sung-Hee,Han, Sang-Hwan 대한한방내과학회 2001 대한한방내과학회지 Vol.22 No.2

This study was designed to investigate the effects of Korean Lycii Fructus water extract in Pb-administered rats. The Pb exposed rats were given 100 ppm and 200 ppm in the distilled water. Sixty male Sprague-Dawley rats weighing between 90 and 110g were blocked into 6 groups according to body weight. The control group was fed a normal diet, without lead. The experimental groups, which was fed a normal diet plus 100 ppm and 200 ppm lead, and one group received a normal diet plus Lycii Fructus water extracts. The results: the Food intake, the weight gain, and the kidney weight content in the cadmium added groups were lower than those in the Lycii Fructus water extracts group. The contents of Pb in the kidneys of the rats were determined by using ICP(lnductively Coupled Plasma Spectrophotometer). The accumulation of lead in the kidney was lower in the Lycii Fructus water extracts group. The Plasma levels of renin activity was higher in the lead administration groups, as compared with the Lycii Fructus water extracts. Plasma levels of aldosterone activity was higher in the lead administration group, as compared with Lycii Fructus water extracts. These results suggest that Lycii Fructus water extracts has a lowering effects on the accumulation of pb on kidney and it is believed that the Lycii Fructus water extracts have some protective effects on lead-induced nephrotoxicity in rats, but the mechanism of these effects was obscure.

6자유도 진동대 - 특성 및 활용방안

이호섭 한국소음진동공학회 1991 소음 진동 Vol.1 No.1

해사기술연구소가 보유하고 있는 6자유도 대형진동대의 시스템 구성과 시험파형 합성기법 및 시험방법에 대하여 간략히 살펴보았다. 통상적인 가진기가 1방향의 운동만을 구현할 수 있음에 비해, 6자유도 진동대는 3축병진, 3축 회전의 임의의 복잡운동을 구현할 수 있는 국내 유일의 설비이며 용량 또한 30톤의 시험체까지를 대상으로 한 대형 진동대로서 각종 분야에 필요한 진동시험 업무를 지원할 수 있다. 구조물의 방진 및 내진설계를 위해서는 가능한한 실물 또는 모형의 실증실험이 필수적이며, 이는 내진 해석기법의 개발 및 검증의 기초가 된다. 특히 이 시스템은 내진 검증시험에 필요한 모든 기능을 갖추고 있으므로, 앞으로 건설될 국내원자력 발전소에 이용되는 각종기기의 내진검증시험을 통하여 이들 기기의 국산화에 크게 이바지할 것으로 보인다.

피로 파괴 제어기술의 현황과 전망

이호섭 대한조선학회 1993 대한조선학회지 Vol.30 No.1

Clinical Correlation between Brain Natriutetic Peptide and Anthracyclin-induced Cardiac Toxicity

이호섭,손창배,신성훈,김양수 대한암학회 2008 Cancer Research and Treatment Vol.40 No.3

Purpose: Anthracycline can effectively treat hematologic malignancies, but has significant risk of cardiotoxicity. We measured the clinical correlation between brain natriuretic peptide (BNP) and anthracycline-induced cardiotoxicity. Materials and Methods: Between March 2005 and March 2007, 86 patients with acute leukemia, malignant lymphoma, or multiple myeloma receiving systemic chemotherapy with anthracycline were enrolled in the Department of Hemato-oncology, Kosin University Gospel Hospital. We investigated the relationship between BNP level and cardiotoxicity through echocardiography, electrocardiography, BNP levels, and symptoms of heart failure at each chemotherapy cycle. Results: Of the 86 participants (mean age, 48.5 years; range 20∼65 years), cardiotoxicity developed in 21 patients (24.4%), with 2 patients showing arrhythmia only, 17 patients with transient aspects of heart failure, and 2 patients with chronic heart failure. Cardiotoxicity related to serum BNP level, age, cumulative dose of anthracycline, accompanying chronic disease, and elevated level of troponin-I. Heart failure was more common if BNP levels reached 100 pg/ml at least once. Conclusions: The clinical correlation between BNP and cardiotoxicity was significant in patients with systemic anthracycline chemotherapy. A prospective clinical trial will be needed to identify the causal relationship between serum BNP level and cardiotoxicity.

비정상 문자 조합으로 구성된 스팸 메일의 탐지 방법

이호섭,조재익,정만현,문종섭 한국정보보호학회 2008 정보보호학회논문지 Vol.18 No.6

As the use of the internet increases, the distribution of spam mail has also vastly increased. The email's main use was for the exchange of information, however, currently it is being more frequently used for advertisement and malware distribution. This is a serious problem because it consumes a large amount of the limited internet resources. Furthermore, an extensive amount of computer, network and human resources are consumed to prevent it. As a result much research is being done to prevent and filter spam. Currently, research is being done on readable sentences which do not use proper grammar. This type of spam can not be classified by previous vocabulary analysis or document classification methods. This paper proposes a method to filter spam by using the subject of the mail and N-GRAM for indexing and Bayesian, SVM algorithms for classification. 인터넷의 활용도가 높아짐에 따라, 스팸메일이 전체 메일에서 차지하는 비중이 점점 커지게 되었다. 전체 인터넷 자원에서 필요에 의해 사용되는 메일의 기능보다, 주로 광고나 악성코드 등의 전파를 위한 목적으로 사용되는 메일의 비중이 점점 커지고 있으며, 이를 방지하기 위한 컴퓨터 및 네트워크, 인적자원의 소모가 매우 심각해지고 있다. 이를 해결하기 위해 스팸 메일 필터링에 대한 연구가 활발히 진행되어 왔으며, 현재는 문맥상의 의미는 없지만 가독상에서 의미를 해석할 수 있는 문장에 대한 연구가 활발히 이루어지고 있다. 이러한 방식의 메일은 기존의 어휘를 분석하거나 문서 분류 기법 등을 이용한 스팸 메일을 필터링 방법을 통해 분류하기 어렵다. 본 연구는 이와 같은 어려움을 해결하기 위해 메일의 제목에 대한 N-GRAM 색인화를 통해 베이지안 및 SVM 을 이용하여 스팸 메일을 필터링 하는 방법을 제안한다.

고객중심의 CRM 구축비교 사례연구

이호섭,Lee, Ho-Seoub 대한경영정보학회 2007 경영과 정보연구 Vol.23 No.-

In the highly competitive and divers world of financial market, customer is the single most important factor to company's survival. Especially, creating a relationship with valued customers is a key to success. CRM provides the mean to retain high value customers. It takes a prospect of what customers expect. Utilizing those knowledge can help the products and service meet the customers' needs, thereby maximizing customer satisfaction and company's profit. In this report, I am going to suggest a few ways to develop successful CRM in the life insurance industry. First, CRM should innovate the way of communication to keep pace with Web 2.0 era. In other words, the customer's needs should be caught by real-time communication than traditional off-line market research. Thus, the functionality and specification of products can be decided by customer's direct choice so that the customers are able to purchase the understanding and experience of the products. Second, CRM project should consider whether the initial strategy plan can promise the stable growth of customer at the first step. When planning strategy, the project needs to identify what customer wants and how to fulfill the needs with stable growth of the customer. In addition, the CRM should be developed by realizing that customer centric benefits ultimately guarantee the growth of the organization. Third, CRM systems should enhance the organization's ability to take the customer's insight in a 360 degree view and to capture the voice of the customer directly. In order to develop the best matched product package, more precise customer segmentation should be ahead of market segmentation strategy. Forth, the biggest reward from CRM will be a customer royalty program. Many successful banks are already planning and practicing customer royalty strategy. A comprehensive analysis of customers and their behavior allow organization to identify high value potential customers' needs and determine a strategy required to meet those needs. Even life insurance companies such as Prudential Korea are developing products designed for royal customers. Fifth, understanding and managing the experience of customer called Customer Experience Management also can increase customer satisfaction. Measuring only customers' experience and adapting it to marketing strategy make products position in the gap between the customers' expectation and experience not required by market. A key component of CEM is its application across all organizational functions. At last, the direction of change and development of CRM can be defined from the conceptualization of information technology represented by Ubiquitous and Web 2.0. Instead of just managing customer information, companies should take the initiative in personalized system with customer oriented strategy. Furthermore, with the regular communication between CRM stakeholders (Sales-Marketing-IT), customer's demand should be directly reflected to enterprise strategy in real time.

Ribosomal RNA와 M13 probe에 의한 clostridium thermocellum 균주들의 RFLP(Restriction Fragment Length Polymorphism)비교

이호섭,홍수형,하지홍 한국미생물학회 1991 미생물학회지 Vol.29 No.3

The degree of the genetic variations among Clostridium thermocellum ATCC 27405 and the wild type strains was investigated by the mehtod of GC ratio, DNA-DNA hybridization and RFLP (Restriction Fragment Length Polymorphism) patterns by ribosomal RNA and M13 probe. GC ratio and KNA homology values of th three isolates were approximately equal to those of ATCC type strain. The RFLP patterns by the rRNA and M13 probe showed some differences among C. thermocellum ATCC 27405, wild type strains and Clostridium thermohydrosulfuricum ATCC 33223, indicating that the two probes can be useful in subspecies- and apecies-identification.

Cellulase의 생산력이 뛰어난 Clostridium thermocellum의 분리

이호섭,최병일,이용현,박용복,하지홍 한국미생물학회 1991 미생물학회지 Vol.29 No.3

Three strains of Clostridium thermocellum, JH01, JH20 and JH30 which are capable of producing ethanol directly from cellulose were isolated from composts. The morphological, cultural and physiological properties of the strains were similar to the ATCC type strain, except for carbon source utilization and degree of ethanol tolerance. All of the three isolates could use glucose and maltose as a sole carbon source and two of them, strains of JH01 and JH20 were three times more tolerant to ethanol than the ATCC type strain. Cellulases secreted by the isolated strains had higher activities than those of the ATCC type strain.