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      • KCI등재

        직무요구가 내재적 동기부여에 미치는 영향 : 상사와 동료의 정서적 및 수단적 지원의 삼원조절효과

        조영,홍가혜 대한경영학회 2019 大韓經營學會誌 Vol.32 No.1

        This study investigated the effects of job demand and social support on employees’ intrinsic motivation based on the job demand-resource model. Although many researchers have examined the antecedents of intrinsic motivation, a study of the relationship between job demand and intrinsic motivation was overlooked. Futhermore, there has been a limitation that the existing studies investigated the social support from the dichotomous or integrative perspective (i.e. supervisor and colleague or emotional and instrumental supports). Thus, we examined the relationship between job demand and intrinsic motivation first, and then the respective effects of the four types of social support on intrinsic motivation. Especially, unlike previous literature, the remarkable difference in this study is considering the supports of both supervisor and colleague between them, simultaneously. Drawing upon the conservation of resource theory, we expected that employees would be selectively dependent on the social support they needed in the situation of high job demand. Hypothesis 1: Job demand will be negatively related to intrinsic motivation. Hypothesis 2: Supervisor’s emotional support (2a) and instrumental support (2b) will be positively related to intrinsic motivation. Hypothesis 3: Colleague’s emotional support (3a) and instrumental support (3b) will be positively related to intrinsic motivation. Hypothesis 4: Social supports will positively moderate the relationship between job demand and intrinsic motivation. In the situation of high job demand, the positive moderating effect will be stronger when selectively depending on the support by either supervisor or colleague than when depending on the supports by both supervisor and colleague. Especially, the positive moderating effect will be the strongest when depending on supervisor’s instrumental support. The result indicated that job demand was negatively related to employees’ intrinsic motivation. Contrary to our expectation, only emotional supports of supervisor and colleague were positively related to their intrinsic motivation. The results of the three-way interaction effects showed that job demand and intrinsic motivation was positively related only when supervisor’s instrumental support was stronger and colleagues’ emotional or instrumental support was weaker. Based on these research finding, we discussed theoretical and managerial implications. 본 연구는 직무요구-자원 모형을 기반으로 직무요구와 사회적 지원이 조직구성원들의 내재적 동기부여에미치는 영향을 고찰하였다. 많은 연구자들이 내재적 동기부여의 중요성을 인지하며 그 선행변수를 살펴본실증연구가 상당히 진행되어 왔음에도 불구하고, 직무요구와의 직접적인 관계를 고찰한 연구는 상대적으로간과되어 왔다. 더불어 사회적 지원에 대한 연구 역시도 상사 및 동료의 지원 또는 정서적 및 수단적 지원등의 이분법적이거나 하나의 변수로 통합한 관점에서만 살펴보았다는 한계점이 존재한다. 이에 본 연구는먼저 직무요구와 내재적 동기부여 간의 관계에 주목하고, 사회적 지원을 네 가지 유형 즉, 상사의 정서적지원, 상사의 수단적 지원, 동료의 정서적 지원, 동료의 수단적 지원으로 구분하여 그 원천과 유형에 따른개별적인 직접효과를 조명하였다. 특히, 기존연구와는 달리 본 연구가 가지는 가장 큰 차별점은 직무요구와내재적 동기부여 간의 관계에서 삼원조절효과를 통해 사회적 지원의 핵심적인 두 축으로서 상사와 동료의지원을 동시에 고려하였다는 점이다. 실제로 조직에서 상사와 동료의 지원을 분리하여 이해하는 것보다는공존하는 관계 속에서 차별적인 역할을 규명하는 것이 좀 더 현실적인 접근이라 할 수 있겠다. 본 연구는자원보존이론을 토대로 직무요구가 높은 상황에서 조직구성원들은 자신에게 필요한 사회적 지원에 선택적으로 의존할 것이라고 예상하였다. 연구결과, 직무요구는 내재적 동기부여와 부의 관계를 나타냈다. 네 가지유형의 사회적 지원과 내재적 동기부여 간의 정의 관계는 예상과는 달리 상사의 정서적 지원과 동료의 정서적지원만이 유의한 것으로 나타났다. 삼원조절효과의 결과는 직무요구가 높은 상황에서 상사와 동료의 지원모두에 의존하기 보다는 상사의 수단적 지원에 선택적으로 의존할 때 내재적 동기부여에 대한 긍정적인 조절효과가 가장 큰 것으로 나타났다. 결론에서는 이러한 결과를 바탕으로 이론적 및 실무적 시사점을 논의하였다

      • KCI등재후보

        북한강수계 (北漢江水系) 인공호에 있어서 식물플랑크톤에 의한 요소분해와 그 크기 분포

        전촌서좌무 (三田村緖佐武),조규송,홍사욱,이해금 ( Osamu Mitamura,Kyu Song Cho,Sa Uk Hong,Hae Keum Lee ) 한국하천호수학회 1990 생태와 환경 Vol.23 No.4

        The influence of natural phytoplankton cell classes upon the response of urea decomposition was investigated in four reservoirs - Lakes Paro, Chuncheon, Soyang and Uiam - in the North Han River System. The decomposition rate of urea was 0.3 to 29.4 μ㏖ urea m^(-3) · hr.^(-1) in the light and 0.2 to 14.9 μ㏖ urea · m^(-3)·hr.^(-1) in the dark. Much higher decomposition rates were observed at the eutrophic stations in Lake Uiam. The urea decomposition in the smaller fraction (<5 ㎛) exceeded that in the middle (5∼25 ㎛) and the larger fraction (>25㎛). No differences in the ratios of urea decomposition to chlorophyll-a or photosynthesis among three fractions were observed. These trends were no different between sampling areas and reservoirs. This may be mainly due to the difference in the standing crop of phytoplankton. The greater part of urea decomposition was the phase of the CO₂ liberation rate into water. 8 to 50% of the urea decomposition was incorporated into the particulate phase in the light, but this was much lower in the dark. A close relationship between urea decomposition and chlorophyll-a or photosynthesis was observed in the three fractions, which have high correlation coefficients. The results of the present study indicate that urea in reservoirs decomposes by phytoplankton rather than bacteria, and thus phytoplankton is more competitive than bacteria.

      • KCI등재
      • KCI등재
      • KCI등재후보

        한강수계 (漢江水系) 인공호에서의(人工湖) 요소분해속도 비교연구

        전촌서좌무 (三田村緖佐武),귤순치,신곡박지 (神谷博之),김범철,조규송 ( Osamu Mitamura,Junji Tachibana,Hiroyuki Kamitani,Bomchul Kim,Kyu Song Cho ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.2

        The in situ rate of urea degradation was measured in the euphotic zone of three reservoirs located in the Han River System, The daily rate of urea degradation(i. e., sum of the incorporation rate of urea carbon into the particulate organic matter and the liberation rate of urea carbon into the water as carbon dioxide) in surface water was 14μmol urea·m^-3.day^-1 in Lake Soyang, 43μmol urea ·m^-3.day^-1 in Lake Chungju and 49μmol urea·m^-3.day^-1 in Lake Paldang. There was no change at various depths. The greater part of urea degradation took place during the the phase of carbon dioxide liberation. In the light, an appreciable amount of urea degradation was incorporated into phytoplankton cells, but this was extremely low in the dark condition. High correlation coefficients were obtained between urea degradation rate and photosynthesis or photosynthetic carbon assimilation rate by unit amount of chlorophyll-a. The residence time of urea in surface water was respectively estimated as 9, 2 and 9 days in Lakes Soyang, Chundu and Paldang. The present results suggest that in reservoirs the urea degradation occurred in connection with photosynthetic activity and that its has an important contribution as one of the nitrogen source for phytoplankton population. The brief residence time of urea indicates that the urea is a rapidly recycled from of biogeochemical parameter.

      • KCI등재후보

        북한강 수계의 댐호수의 생산층에 있어서 요소분해와 회전속도

        전촌서좌무 (三田村緖佐武),조규송,홍사욱,김해금 ( Osamu Mitamura,Kyu Song Cho,Sa Uk Hong,Hae Keum Lee ) 한국하천호수학회 1989 생태와 환경 Vol.22 No.3

        The in situ rate of urea decomposition was measured in the euphotic layer of three reservoirs located in the North Han River System. The urea decomposition rates (as sum of incorporation rate of urea carbon into particulate matter and CO₂ liberation rate into water from urea) in surface waters were 12, 80 and 54 μmol ureaㆍm^(-3) day^(-1), in Lake Soyang, Lake Chuncheon and Lake Euiam. The greater part of urea decomposition took place with the CO₂ liberation into water. High rates of urea carbon incorporation were obtained at surface layer, while low rates were found in lower layer and the dark bottles. The decomposition rate of urea, the carbon incorporation rate, and the CO₂ liberation rate decreased with depth. The vertical distributions of the urea decomposition rate showed similar patterns to those of photosynthesis. The turnover rates of urea in the three reservoirs were calculated respectively as 41, 6.1 and 3.4 days at the surface, and the values increased with depth.

      • KCI등재후보

        동해안 (東海岸) 기수호에서의 (汽水湖) 요소 및 용존유기탄소 (溶存有機炭素) , 질소 (窒素) , 인에 (燐) 관하여

        전촌서좌무 (三田村緖左武),조규송 ( Osamu Mitamura,Kyu Song Cho ) 한국하천호수학회 1984 생태와 환경 Vol.17 No.3·4

        Distribution of urea and dissolved organic matter were surveyed in the two brackish coastal lagoons, Hwajinpo and Yungrangho in August 1978. Concentration of urea was in the range of 0.5 to 3.9 ㎍-atN/ℓ and showed similar pattern of distribution to that of ammonia. The atomic ratio of dssolved organic carbon and dissolved organic nitrogen to dissolved organic phosphorus was 560 : 70 : 1 in Hwajinpo and 740 : 75 : 1 in Yungrangho. In both of the lagoons salinity did not show significant correlation with urea and dissolved organic matter. In the Yungrangho vertical distribution of dissolved oxygen concentration did not show significant correlation with DOC, DON. and. DOP, either. Comprising 0.15 to 1.37 percent of dissolved organic carbon and 2.9 to 20.9 percent of dissolved organic nitrogen, urea which is very susceptible to biological uptake and depletion as nitrogen source of phytoplankton seems to be an important constituent of, dissolved organic matter in brackish lagoons.

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