• 한국경영과학회지
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• 제33권4호
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• pp.13-30
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• 2008

We explore the determinants of long-term relationship between the buyer and the supplier to help suppliers develope a strategy to build long-term relationship with their buyers. Based upon an extensive literature review, we propose three droops of independent variables which may affect long-term relationship, including (a) environmental factors (product complexity, product importance, source dependence, price sensitivity), (b) relational factors(trust, commitment, satisfaction, intention of expansion), (c) operational performance(quality, delivery, cost capability, technical knowhow). The buyer's actual period of relationship with its main supplier is used as a dependent variable. Using hierarchical multiple regression analysis, we empirically test hypotheses, analysing a sample of 290 manufacturing firms in the U.S. The statistical results indicate that the buyer's source dependence, price sensitivity and the supplier's commitment play a significant role in establishing long-term relationship between the buyer and the supplier. However, the supplier's cost capability and technical knowhow in operational performance negatively affect long-term relationship in contrast with our hypotheses. Due to this controversial result, we divide the sample group Into dual sourcing and multiple sourcing environments and reconduct regression analysis in a post hoc manner. The findings show that the supplier's cost capability and technical knowhow are negatively associated with the length of relationship only in the multiple sourcing environment. The results may confirm that both parties' opportunistic behavior is more salient in the multiple sourcing environment than in the single sourcing environment.

• 콘크리트학회논문집
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• 제23권6호
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• pp.817-826
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• 2011

에코시멘트를 이용한 콘크리트는 장기강도 발현이 취약한 문제가 지적되고 있지만 현재까지 그 원인이 불분명하여 구조재료로써 널리 사용되지 않고 있다. 이 연구에서는 에코시멘트를 이용한 콘크리트의 장기강도 발현에 미치는 양생 습도의 영향을 검토함과 동시에 강도 특성과 세공구조의 관계에 대해 검토하였다. 그 결과, 수중양생을 실시한 높은 물-시멘트비 공시체에서 심각한 장기강도 정체가 나타났다. 이것은 재령이 경과하여도 10 nm이상의 세공량이 감소하지 않는 것에 기인하고 있다. 반면, 기중양생의 경우에는 에코시멘트에서도 안정적인 장기강도 증진이 확인되었다. 나아가, 에코시멘트를 보다 안정된 재료로 사용하고자 보통 포틀랜드 시멘트 및 미분쇄 플라이애쉬 혼입에 의한 장기강도 개선에 관한 연구를 실행하였다. 그 결과, 이 연구 범위 내에서 장기강도 개선을 기대할 수 있었고, 더불어 재령이 경과함에 따라 세공구조가 치밀해지는 효과를 얻을 수 있었다.

• Geomechanics and Engineering
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• 제19권2호
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• pp.115-126
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• 2019

The long-term settlement characteristics for the cast-in-place bored pile in the deep-thick soft soil are investigated by post-grouting field tests. Six cast-in-place bored engineering piles and three cast-in-place bored test piles are installed to study the long-term settlement characteristics. Three post-grouting methods (i.e., post-tip-grouting, post-side-grouting, and tip and side post-grouting) are designed and carried out by field tests. Results of the local test show that decreased settlements for the post-side-grouted pile, the post-tip-grouted pile and the tip and side post-grouted pile are 22.2%~25.8%, 30.10%~35.98% and 32.40%~35.50%, respectively, compared with non-grouted piles. The side friction resistance for non-grouted piles, post-side-grouted pile, post-tip-grouted pile and the tip and side post-grouted pile undertakes 89.6~91.3%, 94.6%, 92.4%~93.0%, 95.7% of the total loading, respectively. At last, the parameters back analysis method and numerical calculation are adopted to predict the long-term settlement characteristics of the cast-in-place bored pile in the deep-thick soft soil. Determined Bulk modulus (K) and a creep parameter (Ks) are used for the back analysis of the long-term settlement of the post-grouted pile. The settlement difference between the back analysis and the measurement data is about 1.11%-7.41%. Long-term settlement of the post-grouted piles are predicted by the back analysis method, and the predicted results show that the settlement of the post-grouted pile are less than 6 mm and will be stable in 30 days.

• 디지털융복합연구
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• 제19권3호
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• pp.127-135
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• 2021

본 연구에서는 사옥신축목적의 시설투자 공시기업을 대상으로 내부관계자의 거래행태에 따른 차별적 장기성과를 살펴봄으로써 자본시장의 정보비대칭 현상을 분석하고 있다. 이를 위해 한국거래소 유가증권과 코스닥시장에서 투자공시가 이루어진 기업을 대상으로 사건연구방법과 다중회귀분석을 활용하여 분석하였다. 연구결과 사옥신축 기업의 장기주가수익률은 평균적으로 양(+)의 유의한 값을 나타내고 있다. 공시 전후의 내부관계자 지분변화에 따라 차별적 장기성과가 나타나고 있으며, 회귀분석결과 내부관계자지분, 소액개인투자자의 지분변화는 각각 장기성과와 통계적으로 유의한 양(+)과 음(-)의 상관관계가 있음을 확인하였다. 이는 내부관계자가 경영자의 사적 의도에 대한 진위 여부 및 사옥신축이 기업에 미치는 영향을 판단할 수 있는 정보우위의 위치에 있음을 뒷받침해 줄 수 있는 연구결과로 풀이되며 지분변화요인이 사옥신축 기업에 대한 장기성과의 예측요인으로 활용될 수 있다는 측면에서 자본시장의 투자자들에게 실무적으로 유용한 정보를 제공해 줄 수 있을 것으로 기대된다.

• Journal of Biosystems Engineering
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• 제40권3호
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• pp.178-185
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• 2015

Purpose: This research suggests a method of establishing criteria for working area and operating cost for a long-term lease of agricultural machinery. Methods: Eight crops were selected-three food crops and five open-field vegetables-and agricultural machines used for sowing, transplanting, and cultivation in dry-field farming were analyzed. Results: The break-even acreage for agricultural machinery under a long-term lease was found to differ by agricultural machine, ranging from 1.0 to 5.8 ha. In terms of arable land area, the break-even acreages for harvesting machinery and transplanters were 15.6 to 26.1 ha and 6.1 to 8.6 ha, respectively. The working area lessees should secure was divided into two cases: (1) 2.0 to 11.6 ha when leasing individual agricultural machines (sowing and transplanting) for a long-term period, and (2) more than 10 ha when farmers who cultivate beans, potatoes, garlic, onions, and so on lease sowing and transplanting machines as a set. When agricultural machinery was leased for a long term, the operating cost and working time were reduced by 27.6 to 74.4% and 2.5 to 21.6%, respectively, indicating considerable effect. Conclusions: A long-term lease project needs to be promoted to overcome the limitation of short-term leases of agricultural machinery. The local government should lead this project and facilitate the mechanization of dry-field farming. The department in charge of agricultural machinery lease projects needs to set the working area to cover the rate and maintenance cost for farmers who lease agricultural machinery for the long term.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.227-232
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• 2002

To evaluate the practical application of oyster shells as construction materials, an experimental study was performed. More specifically, the long-term mechanical properties and durability of concrete blended with oyster shells were investigated. Test results indicate that long-term strength of concrete blended with 10% oyster shells is almost identical to that of normal concrete. However, the long-term strength of concrete blended with 20% oyster shells Is appreciably lower than that of normal concrete. 1'hereby, concrete with higher oyster shell has the possibility giving a bad influence on the concrete long-term strength. Elastic modulus of concrete blended with crushed oyster shells decreases as the blending mixture ratio increases. Namely, the modulus is reduced by approximately 10∼15% when oyster shells are blended up to 20% replacing the fine aggregate. The drying shrinkage strain increases as the blending ratio increases. In addition, the existing model code of drying shrinkage does not coincide with the test results of this study. An adequate prediction equation needs to be developed. The utilization of oyster shells as the fine aggregate in concrete has an insignificant effect on freezing and thawing resistance, carbonation and sulfuric acid attack of concrete recycling. However, water permeability is considerably improved.

• 대한간호학회지
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• 제34권2호
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• pp.278-289
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• 2004

Purpose: The purpose of this study was to classify the elderly in long-term care facilities using the Resource Utilization Group(RUG-III) and to examine the feasibility of a payment method based on the RUG-III classification system in Korea. Method: This study measured resident characteristics using a Resident Assessment Instrument-Minimum Data Set(RAI-MDS) and staff time. Data was collected from 530 elderly residents over sixty, residing in long-term care facilities. Resource use for individual patients was measured by a wage-weighted sum of staff time and the total time spent with the patient by nurses, aides, and physiotherapists. Result: The subjects were classified into 4 groups out of 7 major groups. The group of Clinically Complex was the largest (46.3%), and then Reduced Physical Function(27.2%), Behavior Problems (17.0%), and Impaired Cognition (9.4%) followed. Homogeneity of the RUG-III groups was examined by total coefficient of variation of resource use. The results showed homogeneity of resource use within RUG-III groups. Also, the difference in resource use among RUG major groups was statistically significant (p<0.001), and it also showed a hierarchy pattern as resource use increases in the same RUG group with an increase of severity levels(ADL). Conclusion: The results of this study showed that the RUG-Ill classification system differentiates resources provided to elderly in long-term care facilities in Korea.

• 대한간호학회지
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• 제34권2호
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• pp.372-378
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• 2004

Purpose: The purpose of this study was to measure the functional status of stroke patients cared for in different long-term care settings. Method: We assessed all stroke patients in two home health care agencies, four nursing homes and one geriatric hospital in Korea (n=171) using the Resident Assessment Instrument (RAI), which comprises Activity of Daily Living (ADL), urine incontinence, bowel incontinence, a Cognitive Performance Scale (CPS),and being understood and understanding others. Data was collected by face-to-face surveys with patients. Results: The mean ADL score, urine incontinence score, bowel incontinence score, CPS, and being understood score and understanding others score were lowest for the patients receiving home health care, and highest for the patients in nursing homes. Low scores described poor and high scores good functional status. The results showed significant differences in physical and cognitive function scores between the three groups of patients. Conclusion: This study suggests that there may be large differences between the patients in these three types of long-term care settings. These findings can be used to help develop and implement efficient long-term care programs.

• 보건의료산업학회지
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• 제10권4호
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• pp.61-73
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• 2016

Objectives : The aim of this study was to investigate the satisfaction determinants of rehabilitation care group inpatients in rehabilitation long-term care hospitals. Methods : A survey was conducted with 262 patients from 6 rehabilitation long-term care hospitals located in Busan Kyungnam. Data were collected from June 2016 to July 2016 with a structured questionnaire and analyzed with SPSS 23.0. Results : The significant factors affecting the overall satisfaction score were disease group and 5 quality indices of medical services(Medical service quality, Rehabilitation services quality, Hospital reputation, External physical environment, and Internal physical environment). Additionally, the significant factors affecting intention to revisit were age, disease group, length of hospital stay and the 5 quality indices of medical services. Conclusions : The results of this study indicate that rehabilitation long-term care hospitals should try to improve the overall satisfaction of inpatients, especially focusing on the internal physical environment and the quality of the rehabilitation services and medical services, which will lead to a high level of intention for patients to revisit.

• 한국지반신소재학회논문집
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• 제2권2호
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• pp.33-38
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• 2003

부직포와 결합한 보강용폴리에스터 직포 지오텍스타일을 제조한 다음 크리프 시험결과로 부터 허용인장강도를 구하였다. 설계 및 시공을 고려한 안전율로 부터 장기설계인장강도를 구하였고 보강기능을 조사하기 위하여 지오그리드와 복합 직포 지오텍스타일의 장기거동을 비교하였다. 실험결과로 부터 보강용 직포 지오텍스타일이 지오그리드와 같은 충분한 보강성능이 있음을 확인할 수 있었고, 향후 추가실험을 통하여 복합 직포 지오텍스타일의 우수한 보강성능이 지속적으로 검증되어야 할 것으로 생각된다.