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禹彰烈 관동대학교 경영경제연구소 2001 경영논집 Vol.20 No.-
최근 구조조정 문제는 우리 나라 기업의 가장 중요한 이슈가 되고 있다. 구조조정이 성공적으로 수행되기 위한 여러 가지 전제조건 중 특히 조직구성원의 태도와 행동이 가장 중요하다. 구조조정은 조직구성원에게 고용불안에 의한 위협과 스트레스를 주지만, 조직을 발전시켜 궁극적으로는 구성원에게 이익이 되는 순기능적 측면을 갖는다. 구조조정에 대한 구성원의 반응도 다양하여 조직에 저항하고 업무를 소극적으로 수행하는가 하면 혹은 구조조정의 당위성을 인정하고 협력적인 반응과 행동을 보인다. 이러한 구성원의 반응에 영향을 미치는 변수는 경영자에 대한 조직구성원의 신뢰와 공정성 지각, 그리고 개인특성 등이 있다. 구조조정과 구성원의 반응간에 조절효과를 갖는 변수의 연구를 통해 보다 긍정적이고 협조적인 구성원의 반응을 이끌어 낼 수 있을 것이다. 본 논문에서의 구조조정은 인원감축을 핵심으로 한 다운사이징에 초점을 둔다.
이동전화 혼신개선을 위한 주파수 재사용 패턴에 관한 연구
박창렬,문병현 대구대학교 과학기술연구소 1995 科學技術硏究 Vol.2 No.1
주파수 자원이 한정된 열악한 무선환경하에서 오늘날 AMPS방식의 셀룰러 이동전화 시스템에서는 급증하고 있는 가입자 수요에 대처하기 위해서는 효율적인 셀 계획 및 채널할당이 무엇보다도 중요하다. 특히 트래픽 밀집지역인 대도시의 경우 급증하는 이동전화 가입자 수요에 대처하기 위해서 시스템 용량만을 고려한 주파수 재사용패턴을 사용한다면 주파수 간섭으로 인한 혼선문제가 더욱 심각해질 수 밖에 없다. 본 논문에서는 지형과 도심환경을 고려한 셀룰러 이동전화 시스템에서 N=7과 N=5의 주파수 재사용 패턴을 사용하였을때 동일채널간섭비를 대구광역시에 적용 비교 분석하였다.
박창진,양재의,유경열,장용선,김원일 한국환경농학회 2004 한국환경농학회지 Vol.23 No.4
The objective of this research was to develop the adsorbent for heavy metals by activating the bark sample. Barks from pine tree with diameters of 2~4 mm were activated in the muffle furnace under a high relative humidity condition at temperatures of 600~900℃. The removal efficiency of the activated bark (ACTBARK) for Cu and Cd was temperature dependent showing the order of 900℃ > 800℃ > 700℃ > 600℃. The critical temperature was considered to be 900℃ to become an efficient adsorbent for Cu and Cd. The bark samples activated at temperatures lower than 700℃ showed a less removal efficiency than the crude bark The ACTBARK activated at 900℃ removed more Cu and Cd from solution than the commercial activated carbon and charcoal. The ACTBARK (activated at 900℃) adsorbed all of the Cu and Cd in solution with concentrations less than 150 mg/L. The selectivity of the ACTBARK was in the order of Cu>Zn>Ni>Pb>Fe>Cd>Mn.
상아질 결합제의 종류와 처리방법에 따른 전단결합강도와 상아질-레진 결합계면 미세구조에 관한 연구
임창하,이용렬,정영화,송호준,박영준 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.1
The purpose of this study was to evaluate the dentin bonding agents (DBA) with the variations of the bonding system generations (4^th, 5^th and 6^th) and application methods by comparing the shear bond strengths (SBS) which were determined 24 h after application and dentin-adhesive interface microstructure. It was also aimed to suggest the theoretical clues for the adequate use of each bonding systems. The parameters were 1) generation of bonding systems (one product of 4^th, eight products of 5^th, and three products of 6^th generation), 2) moisture condition of the dentin surface after acid conditioning (moist group vs. dry group), 3) solvent type of the primers (three acetone-based, one acetone/ethanol-based, two water/ethanol-based, four water-based, one ethanol-based, one water/acetone-based), and 4) type of etchants (seven with phosphoric acid, three with self-etching primer, and one with 10-3 etchant). The results were as follows; One-bottle adhesives had comparable shear bond strengths compared to multiple component bonding agents, and some showed even higher results. Single Bond had the highest SBS value (20.6 ㎫) in the moist subgroup. For 4th and 5th generation DBAs, except for Mac Bond Ⅱ, all bonding systems showed lower SBS when dentin became desiccated after the conditioning-rinsing step, and generally shorter resin tags were produced in dry condition. Acetone-based adhesives generally showed better penetrability into dentinal tubules, and tended to be more sensitive to the degree of dentin dampness compared to those of the ethanol- or water-based adhesives. With Mac Bond Ⅱ which uses a self-etching primer, even though the hybrid layer was thin with a thickness of 1∼2 μ m, SBS was comparatively high. In the case of 6^th generation DBAs, Prompt L-Pop showed significantly lower SBS to dentin (7.4 ㎫) compared to those of AQ bond (13.3 ㎫) and One-Up Bond F (13.1 ㎫)(p<0.05). The hybrid layer was thin with a thickness of about 1μ m. In the case of AQ bond and One-Up Bond F, dentinal tubules were relatively well sealed. In the case of Prompt L-Pop, on the other hand, some of the dentinal tubules were not completely sealed, and fractured resin tags and separation between the hybrid layer and composite resin were observed. In the case of AQ bond, about 15μ m-thick resin layer was formed and many of the adhesive resin tags could not penetrate deep into the dentinal tubules. In the case of One-Up Bond F, many resin tags which are more than 50μ m-long were formed, but short penetration was also seen in some tubules. It is concluded that even though resin tag formation contributes in some extent for the bond strength, sufficient penetration of the adhesive resin to the exposed collagen meshwork and complete curing there in, and having sufficient strength to withstand the stress caused by the polymerization shrinkage during the light curing is essential for the success of the bonding procedure.