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.

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.

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.

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

본 논문에서는 정지궤도 위성을 운용하는 위성통신환경에서 이동형 위성단말의 송신전력제어를 위한 개루프 전력제어 알고리즘을 제안한다. 제안하는 알고리즘은 위성체로부터 전송되는 비콘 신호를 기준으로 현재 위성채널 상태가 장애물에 의해 LOS가 제한되는 상황인지, 안테나의 위성추적 오차로 인해 발생되는 손실인지 판별한다. 판별된 신호감쇄 원인을 기준으로 안테나 위성추적 오차 시는 RF 출력을 멈추며, 장애물에 의한 채널 단절이 발생될 경우는 전력제어 없이 확산을 통해 데이터 수신 확률을 향상시킨다. 제안하는 알고리즘의 성능분석을 위해 인접위성 간섭 수준과 채널 아웃티지 확률을 분석하였으며, 분석결과 제안하는 알고리즘이 더 높은 성능을 보임을 확인하였다. 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.

Polyimide asymmetric membranes for CO₂ capture

이호섭,우경택,이종명,이영무 한국고분자학회 2014 한국고분자학회 학술대회 연구논문 초록집 Vol.2014 No.4

鍼刺가 建康人의 血漿內 β-endorphin 含量및 renin活性에 미치는 影響

李昊燮 圓光大學校大學院 1985 學位論叢 Vol.15 No.-

Acupuncture has been used as a therapeutic treatment to control the various types of illness in oriental medicine. Especially it has been suggested as a treatment of choice for the pain control during the acute phase of illness. Scarce reports have been appeared on its mechanism. To clarify the possible mechanism, I have examined for the plasma hormonal changes in the healthy person. Plasma β-endorphin concentration was increased by the acupuncture at the meridian point Hap Kok (1,1 4) up to 2 hour after application, whereas plasma β-endorphin concentration failed to show changes after acupuncture at the meridian point Jok Sam Lee(S 36) or Shin Soo(B 23). Plasma renin activity was decreased after acupuncture at the meridian point Shin Soo while plasma renin activity failed to show changes after acupuncture at the meridian point Jok Sam Lee or Hap Kok. These results suggest that the hormonal responses to acupuncture could be different with the different sites of application, and that the effects of acupuncture at the meridian point Shin Soo could be caused via the changes of plasma renin activity.

구조시험설비 설계 및 모형실험 활용기술 개발

이호섭,김기성,김재동,신병천,노인식,임채환,김영중,정종안,Lee, Ho-Seop,Kim, Gi-Seong,Kim, Jae-Dong,Sin, Byeong-Cheon,No, In-Sik,Im, Chae-Hwan,Kim, Yeong-Jung,Jeong, Jong-An 한국기계연구원 1984 기계연구원소보 Vol.13 No.-

足三里穴 鍼剌가 家兎의 胃運動에 미치는 影響

李昊燮 圓光大學校大學院 1981 學位論叢 Vol.6-2 No.-

The following results were gained by investigating the change of the gastric motility of rabbit by acupuncture at the meridian point S.36 (Ill.36). 1. The average gastric motility was increased from 237.1 to 287.2 by the acupuncture stimulation. 2. The average gastric motility was increased from 112.0 to 144.9 by the electric acupuncture stimulation. 3. After the injection of methacholine 100㎍/㎏ through the ear vein of rabbit the average gastric motility was decreased from 313.4 to 171.6, but the injection of the same amount of methacholine after the acupuncture the average gastric motility was decreased from 267.2 to 216.1. 4. After the injection of norepinephrine 100㎍/㎏ through the ear vein of rabbit the average gastric motility was decreased from 372.8 to 192.1, but the injection of the same amount of norepinephrine after the acupunctuer the average gastric motility was decreased from 418.2 to 263.8.

Gd₂(MoO₄)₃단결정의 적외선 반사스펙트럼

이호섭 國立昌原大學校 基礎科學硏究所 1992 基礎科學硏究所論文集 Vol.3 No.-

Infrared reflection spectra of Gd₂(MoO₄)₃single crystals are measured in the range 600-??????. The spectra are analysed with dielectric dispersion analysis and Kramers-Kronig relation. Optical phonon modes TO and LO phonon modes of B₁and B₂show very strong oscillator strengths and small damping constants, whreras A₁polar mode have shows large damping constant. The frequency inversion between TO and LO phonons are observed near the TO phonon with large oscillator strength.

( CH3NHCH2COOH ) 3CaCl2 단결정의 강유전 상전이 현상에서의 불순물효과

이호섭 창원대학교 1993 논문집 Vol.15 No.