Presently, the most promising family of lead-free piezoelectric ceramics is based on K0.5Na0.5NbO3(KNN). Lithium, silver and antimony co-doped KNN ceramics show high piezoelectric properties at room temperature, but often suffer from abnormal grain growth. In the present work, the (Ba0.85Ca0.15)(Ti0.88Zr0.12)O3 component, which has relaxor ferroelectric characteristics, was doped to suppress the abnormal grain growth. To investigate this effect, Lead-Free 0.95(K0.5Na0.5)0.95Li0.05NbO3-(0.05-x)AgSbO3-x(Ba0.85Ca0.15)(Ti0.88Zr0.12)O3[KNLN-AS-xBCTZ] piezoelectric ceramics were synthesized by ball mill and nanosized-milling processes in lead-Free 0.95(K0.5Na0.5)0.95Li0.05NbO3-(0.05-x)AgSbO3 in order to suppress the abnormal grain growth. The nanosized milling process of calcined powders enhanced the sintering density. The phase structure, microstructure, and ferroelectric and piezoelectric properties of the KNLN-AS ceramics were systematically investigated. XRD patterns for the doped and undoped samples showed perovskite phase while tetragonality was increased with increasing BCZT content, which increase was closely related to the decrease of TO-T. Dense and uniform microstructures were observed for all of the doped BCZT ceramics. After the addition of BCTZ, the tetragonal-cubic and orthorhombic-tetragonal phase transitions shifted to lower temperatures compared to those for the pure KNNL-AS. A coexistence of the orthorhombic and tetragonal phases was hence formed in the ceramics with x = 0.02 mol at room temperature, leading to a significant enhancement of the piezoelectric properties. For the composition with x = 0.02 mol, the piezoelectric properties showed optimum values of: d33 = 185 pC/N, kp = 41%, Tc=325˚C, TO-T=-4˚C.

입도조정기층 재료의 역학적 특성평가를 위하여 15개 시료에 대해 반복재하 삼축압축시험, CBR 시험, 투수계수시험을 수행하였다. 입도조정기층 재료의 CBR 값은 32~110 범위(평균 81)에서 매우 폭넓게 결정되었으며, 수침조건에서 팽창량은 0.04mm 이하로 나타났다. 입도조정기층 재료의 탄성계수는 체적응력의 영향을 매우 크게 받았으며 선형체적응력모델의 적용성이 가장 뛰어남을 확인하였다. 입도조정기층 재료의 탄성계수는 100MPa~600MPa, 모델계수 k1은 80~270, 모델계수 k2는 0.1~0.6 사이에서 결정 되었다. 체가름시험과 다짐시험에서 결정된 지수물성치로부터 입도조정기층 재료의 탄성계수를 결정하는 경험모형을 제안하였다. 제안된 경험모형의 결정계수는 모델계수 k1 결정에 있어서는 0.423, 모델계수 k2 결정에 있어서는 0.920, 응력단계별 탄성계수 결정에 있어서는 0.872로 평가되었다.

Member's perception toward organizational climate is an abstract concept but generally it has been used in the meaning of Organizational climate by members, in an attempt to give an idea of what kind of meaning an organization can have from a psychologica

본 연구에서는 GC-MS를 이용하여 괴산군 지역에서 생산되고 있는 각종 고추에 대해 품종별로 capsaicin 및 dihydrocapsaicin의 함량을 조사하였고, 괴산청결고추조합에서 생산하여 시판되고 있는 고춧가루에 대해서도 매운맛 등급별 capsaicin과 dihydrocapsaicin의 함량을 조사하여, 고춧가루의 매운 정도를 capsaicin의 함량으로 표시하는 방법을 제시하고자 하였다. 고추의 품종별 capsaicin의 함량은 청양이 123.62 mg%, 한반도는 95.97 mg%, 건초왕은 84.00 mg%, 우리건은 70.62 mg%, 금빛은 55.36 mg%, 무한질주은 45.19 mg%, 독야청청은 43.98 mg%, PR대촌은 38.92 mg%, 대박나는 31.63 mg%, 신세계는 29.82 mg%, 장수왕은 28.23 mg%, 오광은 34.42 mg%, 대통은 25.18 mg%였으며, 시판 고춧가루제품의 경우 아주매운맛 등급이 101.98 mg%, 매운맛이 67.63 mg%, 보통맛이 37.74 mg%, 순한맛이 14.73 mg%이었다. 본 실험결과 및 아주매운맛, 매운맛, 보통맛, 순한맛의 4등급으로 분류되어 현재 시판되고 있는 매운맛 등급을 참고하여, capsaicin 함량에 따른 매운맛의 등급별 분류를 7등급으로 제시하였다. 즉 매운맛 1등급은 120 mg%이상, 2등급은 100~120 mg%, 3등급은 80-100 mg%, 4등급은 60-80 mg%, 5등급은 40-60 mg%, 6등급은 20-40 mg%, 7등급은 20 mg%이하로 분류하였다. 이를 바탕으로 고춧가루를 이용해서 만드는 김치, 고추장, 양념소스류 등의 가공식품제조 시 문제되는 매운맛의 비객관적, 불균일성을 개선하며 재현성을 유지할 수 있을 것으로 사료 된다.

용인시 석성산은 북위 37˚15'15'~37˚17'00', 동경 127˚09'30'~127˚11'00'에 걸쳐 위치한다. 군집분석 결과 B지역에는 170종류의 관속식물이 생육하고 있어 조사지역 가운데 가장 식생이 풍부한 것으로 조사되었고, C지역은 140종류의 관속식물을 갖고 있어 다음으로 식생이 풍부하다. 그러나 관속식물의 유사도 지수는 B지역과 D지역이 53.7%로 가장 높은

석성산은 북위 37˚15'15'~37˚17'00'와 동경 127˚09'30'~127˚11'00'에 걸쳐 용인시에 위치한다. 본 조사 지역에는 4강, 34목, 75과, 175속, 243종, 45변종, 5품종 등 모두 293분류군의 관속식물이 생육하는 것으로 조사되었다. 환경부 지정 식물구계학적 특정식물종은 5등급 1종류, 4등급 1종류, 3등급 6종류, 2등급 3종류 및 1등급 1

  This paper aims to examine the main factors of the organizational climate and analyze their effects on job involvement. To accomplish these purposes, the main factors of the organizational climate such as diversity, autonomy, redundancy, connectivity an

This paper aimed to examine core factors of the knowledge management and analyze their effects on organizational performance (employee satisfaction and competitive advantage). To accomplish this purpose, this study examined previous studies and summarized

This paper aims to examine the main factors of the organizational climate and analyze their effects on job involvement. To accomplish these purposes, the main factors of the organizational climate such as diversity, autonomy, redundancy, connectivity and flexibility were found from the previous studies. The questionaries of 350 were distributed to the employees working at the Gumi Industrial Complex. The questionaries of 298 were obtained and 267 were analyzed through frequencies, correlation and multiple regression. The results of this study are as followings; First, we conducted exploratory factor analysis for five constructs (diversity, autonomy, redundancy, connectivity and flexibility) using oblique rotation method that did not assume independence among the factors and main factors of knowledge management were grouped together by five factors. Second, it is shown that fore main factors of organizational climate have a positive influence on the job involvement (p<0.05). This study, however, have limitations of number of sample and survey area. The future study should consider these limitations in improving model applicability in practice.

This study examines the relationship between multiple sales force management practices and performance within each of Miles & Snow (1978)'s strategy types and Walker & Ruekert (1987)'s strategy types. The findings are as follows First, Prospectors seem to

본 논문에서는 하천생태계의 환경평가 기법과 생물다양성 관리시스템을 개발하여 한국의 하천에 적용한 사례를 소개하였다. 전국 하천에서 장기간 수집된 조사자료와 문헌자료 뿐만 아니라 북한강 수계의 일련의 하천들을 대상으로 종합적으로 실시한 야외조사를 바탕으로 하천생태계의 환경과 생물다양성에 대한 조사연구의 체계를 고찰하였고, 한국 하천의 주요 환경훼손 유형을 분류하였고, 하천자연도등급 간이평가표를 작성하여 제시하였으며, GIS를 적용한 하천생태계의 생물다양성

This study examines the relationship between multiple sales force management practices and performance within each of Miles & Snowꡑs strategy types(1978) and Walker & Ruekertꡑ s strategy types(1987). The findings are as follows : First, Prospectors seem to be associated with increased performance when they are utilizing a relationship selling strategy, internal sales force, moderate levels of supervision, outcome-based control system and incentive-oriented compensation system. Second, Analyzers seem to be associated with increased performance when they are utilizing a relationship selling strategy, internal sales force, outcome-based control system to deal with the instability in their strategic focus. Third, Low Cost Defender seem to be associated with increased performance when they are utilizing a relationship selling strategy, external sales force, low levels of supervision, outcome-based control system and salary-oriented compensation system. Fourth, Differentiated Defenders seem to be associated with increased performance when they are utilizing a relationship selling strategy, high levels of supervision, balanced(outcome+behavior) control system and salary-oriented compensation system.

The employees in information system organization are highly exposed to stress. However, there is little theoretical or empirical study on the effects of job stress on IS organizations. A major reason is because few researchers consider consequences of job

This study was designed to observe the effects of T-2 toxin on total cholesterol and lipid concentration in rat serum. T-2 toxin is a secondary metabolite produced by Fusa~rdum sp. which is often found on agricultural products including cereals, and it is a causal material of liver injuries in cattle and humans. When we fed rats with standard diet treated with T-2 toxin, the body weight and feed consumption of rats treated with T-2 toxin were decreased. As the results of lipid analysis, the concentrations of total cholesterol and free cholesterol in serum of treated rats were increased compared to non-fed control group, On the other hand, the levels of triglyceride and phospholipid in the serum of T-2 toxin treated experimental groups were declined. In conclusion, T-2 toxin largely influenced on the total cholesterol and lipid levels in rat serum.