솔젤 (Sol-gel) 방법에 의한 Pb5Ge3O11박막의 제작과 강유전 특성

이호섭,정창희,김효은,김진수,장기완 한국물리학회 2013 새물리 Vol.63 No.7

Ferroelectric Pb5Ge3O11 (lead germanate, PGO) thin films were deposited by using the sol-gel method under various heat treatment conditions. The thin films were fabricated at a preheating temperature of 350 ℃ or 400 ℃ and were annealed at 550 ℃ or 600 ℃ in air for different durations. The thin film fabricated at a preheating temperature of 350 ℃ for 5 min and annealed at 600 ℃ for 1.5 hr had uniform SEM grain images and showed a saturated ferroelectric polarization-electric field (P-E) hysteresis loop. PGO thin films with preferred c-axis orientation were observed and exhibited ferroelectric P-E hysteresis loops with a remanent polarization (Pr) of 2Pr = 1.9 ~ 7.9 μC/cm2 and a coercive field (Ec) of 2Ec = 160 ~ 180 kV/cm. Sol-gel 방법으로 강유전체 Pb5Ge3O11의 박막을 제조하여열처리 조건에 따른 결정 입자의 성장과 강유전 특성을 조사하였다. Pt(111)/Ti/SiO2/Si(100) 기판 위에 제작한 Pb5Ge3O11박막의 열처리 온도 및 시간에 따른 결정 입자의 성장, 표면 미세구조 및강유전 이력곡선을 관찰하여 강유전 Pb5Ge3O11 박막제조에필요한 최적 성장조건을 확인하였다. 강유전 Pb5Ge3O11 박막제조의 최적 조건은 성형 과정의 1차 열처리 및 2차 열처리 온도가 각각350 및 600 ℃ 근방이었다. 최적 조건에서 제조된박막은 c축 방향의 배향성을 보였으며, 포화된 강유전 이력곡선과전기용량-전압의 거동은 전형적인 강유전 특성을 나타내었다. 잘 성장된강유전 Pb5Ge3O11 박막의 자발분극 Pr과 항전기장 Ec은각각 2Pr = 1.9 ~ 7.9 μC/cm2 과 2E_c = 160 ~ 180kV/cm였다.

다발성 골수종의 진단과 치료

이호섭 대한내과학회 2019 대한내과학회 춘계학술대회 Vol.2019 No.-

대학생의 전공선호도와 교직기대감이 학업효능감에 미치는 효과 분석

이호섭,이석열 사단법인 인문사회과학기술융합학회 2016 예술인문사회융합멀티미디어논문지 Vol.6 No.7

본 연구는 일반학과의 교직과정 이수학생들의 전공선호도와 교직기대감이 학업효능감에 미치는 영향력과 효과에 대하여 알아보는 데 목적이 있었다. 연구를 위해 일반대학의 중국어와 일본어를 전공하는 학생들을 대상으로 설문조사를 실시하였고, 총 258부의 설문지를 분석하였다. 분석결과를 보면 학업효능감(자신감, 자기조절효능감, 과제난이도 선호)과 상관을 보이는 변수는 전공기대감, 직무만족도, 교직관, 직무수행능력으로 나타났다. 전공선호도와 교직기대감이 학업효능감에 미치는 영향력을 분석한 결과, 전반적인 회귀분석 설명력은 높게 나타나고 있지 않지만, 전공기대감과 교직관이 학업효능감에 유의미한 영향력을 미치는 것으로 나타났다. 결론적으로 전공선호도(전공기대)와 교직기대감(교직관)은 전체 학업효능감에 긍정적인 영향을 미치고 있었다. 향후 교직기대감과 같은 변수들이 교직과정 운영 전공이나 학과에서 어떻게 학생들에게 작용되고 있는 지를 파악하기 위한 후속연구가 필요하며, 이러한 연구결과들이 교직과정 운영과 대학의 신입생 선발 등에 반영될 필요가 있음을 시시한다. The objective of this study is to observe how the preferences for major and expectations for the teaching profession of students who have completed teacher training for general departments affects the learning efficacy. For this purpose, 252 surveys of students majoring in Chinese and Japanese at general universities were analyzed. The analysis results show the factors related to learning efficacy (self-confidence, self-regulatory efficacy, preference of task difficulty) to be expectations for one's major, satisfaction of the teaching profession, views of teaching and professional competence. The results of analyzing the effect of preference of major and expectations of the teaching profession on learning efficacy shows, although the overall explanatory power of the regression analysis does not appear to be high, expectations of one's major and views on teaching has a significant affect on academic efficacy. In conclusion, preference for major (expectations for one's major) and expectations of the teaching profession (views on teaching) has an overall positive effect on learning efficacy. Further research determining how factors such as the expectations of the teaching profession are applied to students through the majors or departments managed by teacher training is needed, and such research results need to be applied to teacher training management and university freshmen selection.

제53차 추계학술대회 : 일반 포스터 ; Beta Hydroxy Acid가 여드름 환자의 안면피부장벽에 미치는 영향 분석

이호섭,김상백,박재홍,윤홍석,손상욱,김일환 대한피부과학회 2001 초록집 Vol.39 No.20

라만분광학에 의한 무연 (Na0.5K0.5})NbO3 세라믹의 진동모드와 상전이 특성 연구

이호섭,김효은,김진수,이광세 한국물리학회 2017 새물리 Vol.67 No.11

We have synthesized lead-free (Na$_{0.5}$K$_{0.5}$)NbO$_3$ (NKN) ceramics and used Raman spectroscopy to investigate the temperature dependences of the internal vibrational mode. With increasing temperature, the Raman peaks broadened and the peak frequency shifted to lower frequency. Especially, changes in the Raman peak's frequency were observed at the phase transitional temperatures of $T_{O-T}$ (orthorhombic-tetragonal) and $T_c$ (tetragonal-cubic). We discuss the temperature dependences of the Raman spectra related to the internal vibrations of NbO$_6$ octahedra and compared the results to dielectric behavior. 무연 (Na$_{0.5}$K$_{0.5}$)NbO$_3$ (NKN) 압전세라믹을 합성하여 라만분광 특성을 측정하였으며, 온도 및 상변화에 따른 내부진동 특성을 연구하였다. 온도가 올라감에 따라 NKN 세라믹의 라만분광은 분광피크의 폭이 넓어져 완화된 특성을 보였으며, 라만분광의 피크 주파수는 감소하였다. 특히, 두 상전이 온도 즉, 사방정-정방정계 $(T_{O-T})$ 및 정방정-입방정계 $(T_c)$ 온도에서 라만 피크 주파수는 뚜렷한 변화를 나타내었다. 온도 증가에 따른 산소팔면체 NbO$_6$의 내부 진동의 변화를 연구하였으며, 사방정-정방정계 및 정방정-입방정계의 구조상전이에 따른 라만분광 특성의 변화를 온도 증가에 따른 유전거동과 비교하였다.

고내열성 발포 절연 컴파운드 및 이를 적용한 자동차 전장용 고속 통신 케이블 개발

이호섭,박성근,박철현,강승훈 한국고분자학회 2018 한국고분자학회 학술대회 연구논문 초록집 Vol.43 No.2

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.

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.-

제55차 춘계학술대회 : 포스터 ; 조갑 기질 분화를 동반한 함입성 섬유 각화종 (invaginated fibrokeratoma) 1예

이호섭,우상혁,유화정,윤영민,송해준,오칠환 대한피부과학회 2003 초록집 Vol.41 No.10

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.