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유재욱,유은종,Yoo, Jae-Wook,Yu, Eun-Jong 한국공간구조학회 2013 한국공간구조학회지 Vol.13 No.4
The Age-adjusted effective Modulus Method(AEMM) is one of the methods adopted for the construction stage analysis of concrete structures. The AEMM uses the aging factor to consider the effects of the varying concrete stress. In the aspects of computation time and the accuracy of the results, the AEMM is considered as one of most appropriate methods for construction stage analysis of tall building structures. Previous researches proposed appropriate values of the aging factor in the forms of graphs or using very simple equations. In this paper, an equation for estimating the aging factor as a function of rebar ratio in the section, compressive strength of concrete, notional member dimension, and age of concrete at the load application. The validity of aging factor proposed in this paper were examined by the comparison with the results of step-by step method.
유재욱(Jaewook Yoo),이동주(Dongju Lee) 한국산업경영시스템학회 2009 한국산업경영시스템학회지 Vol.32 No.2
In continuous review inventory model, (Q, r) system, order quantity(Q) and reorder point(r) should be determined to calculate inventory-related cost that consists of setup, holding, and penalty costs. The procedure to obtain the exact value of Q and r is complex. In this paper, a regression analysis is proposed to get the approximate inventory-related cost without the determination of Q and r in the case that the standard deviation(σ) of the lead time demand is small or that the mean(μ) of the lead time demand is proportional to σ. To save inventory-related cost, central warehouses with (Q, r) system can be built. Central warehouse can provide some stores with products with the consideration of the tradeoff between inventory-related cost and transportation cost. The number and the location of central warehouses to cover all the stores are determined by a regression-based approach. The performance of the proposed approach is tested by using some computational experiments.
경쟁행위 요인과 기업성과 간의 관계에 대한 실증적 연구
유재욱(Jaewook Yoo) 한국인터넷전자상거래학회 2011 인터넷전자상거래연구 Vol.11 No.1
This study examines the relationships between competitive-behaviors attribute and firm performance in Korean life-insurance industry. The findings of a multiple regression analysis of ten-years sample of life-insurance companies in Korea represent that the action frequency has significant positive relations with new business rate whereas the response frequency of them has significant positive relations with persistent business rate. Inconsistent with the hypotheses, however both action- and response-speed did not reveal the positive relations with either of quantity or quality of firms performance. The present study contributes to an under-researched, yet very important area in competitive dynamics. In particular, the findings of this study imply that future study in competitive dynamics should adopt a dynamic approach than static approach in an empirical analysis. They are also valuable to practicing managers in life-insurance firms in Korea by adding their understanding of the ongoing competitive dynamics in the market.
유재욱(Jaewook Yoo),양재영(Jae Young Yang) 한국경영과학회 2019 經營 科學 Vol.36 No.1
A make-or-buy (MOB) decision about some technical attributes in product design and development is the act of choosing between making them in-house or purchasing from an external supplier. In this study, the transaction cost approach is used to reflect the MOB decision to the product line design optimization problem. The problem including the MOB decision is formulated as a multi-objective function model to satisfy three aspects of interest in product design and development as well as a column-dropping rule is proposed as the solution approach. The proposed model and solution approach are illustrated with a tablet pc under multi-segment market, and the sensitivity analysis is performed to study how the proposed model and its solutions respond to the variation for the priority of the objective functions.
유재욱(Jae Wook Yoo) 건국대학교 경제경영연구소 2010 商經硏究 Vol.35 No.1
본 연구는 외생적 충격에 직면한 성공기업의 실패요인을 기업의 지속가능한 경쟁우위에 미치는 슘페테리안 효과에 대한 역동적 관점에서의 고찰을 통해 제시하는데 주된 목적을 두고 있다. 이를 위하여 먼저 환경의 안정기에 속해 있는 기업의 지속가능한 경쟁우위 달성을 위한 필수요소로서 경쟁전략, 조직구조, 기술 간의 조화를 강조하는 공변화 모델을 제시하였다. 더불어 이와 같은 공변화의 효과적인 운영을 통해 달성한 경쟁우위가 외생적 충격에 직면하게 되었을 때 어떻게 경쟁우위가 아닌 경쟁열위의 요인으로 변질될 수 있는지를 동태적 능력과 지배적 논리의 관점에서 설명하고 있다. 본 연구는 조직이론 관점에서의 슘페테리안 경쟁 논리를 포괄하는 전략경영 분야의 향후 연구의 중요성을 시사하고 있다. The purpose of this research is to offer an exploration of why successful firms fail in the face of exogenous shocks by incorporating a temporal component and reviewing the impact of Schumpetrian shocks on sustainable competitive advantage. For this purpose, I first propose a covariation model that represents the importance of the fit among a firm’s competitive strategy, structure, and technology to achieve a sustainable competitive advantage during the periods of stability. Then I suggest the propositions revealing how this sustainable competitive advantage turns to a competitive disadvantage, and thus become a reason for the failure of successful firms in the face of exogenous shocks. The propositions are particularly amplified in the perspectives of dynamic capability and dominant logic, the two emerging theories in strategic management. The research suggests an effective integration of the strategic management research on firm-specific assets and capabilities with the organizational theory research on Schumpeterian competition as a future research area that should receive more attention from academics.
아웃소싱 전략을 활용하는 두 단계 흐름생산라인에서 완료시간의 총합을 최소화하는 일정계획문제
유재욱(Jaewook Yoo),이익선(Ik Sun Lee) 한국경영과학회 2016 經營 科學 Vol.33 No.2
We treats a job scheduling in a 2-machine flow-shop problem with outsourcing strategy allowed. Jobs in the first machine are processed in-house or outsourced to the other companies. In this paper, all the considered jobs are determined to be in-house processed or outsourced. When a job is outsourced, then the firm should pay an outsourcing cost additionally. We want to minimize the sum of the outsourcing costs and the total completion times of finished jobs. In this paper, some solution properties are characterized, and then some heuristic algorithms and a branch-and-bound solution algorithm are derived. This paper evaluates finally the performance of the proposed algorithms during the numerical tests.
한국 생명보험 산업부문 외국기업과 현지기업의 상호경쟁행위 차이에 대한 실증적 검증
유재욱(Jae Wook Yoo),최영준(Youngjun Choi) 한국전략경영학회 2010 전략경영연구 Vol.13 No.1
본 연구는 해외시장에 진출한 외국계 다국적 기업들과 국내 기업들의 경쟁행위(competitive behaviors)에서 나타나는 특징적인 차이들을 제시하여 경쟁역학 분야의 연구 발전에 기여하고, 해외시장에 진출하는 다국적기업들과 이와 같은 다국적기업들의 공격적인 자국시장진입에 직면하는 현지기업의 경영자들에게 효율적인 경쟁을 위해 도움이 될 수 있는 실무적 차원의 시사점을 제공하는데 목적이 있다. 이와 같은 목적을 위해 다양한 경쟁행위들을 공격행위와 이에 대응하는 반응행위로 나누어 각 행위별로 외국계 기업들과 국내 기업들의 상호집단 간 특성 차이에 대한 가설들을 수립하고, 국내 생명보험 산업에서 경쟁하고 있는 외국계 기업들과 국내 기업들의 다년간의 경쟁행위 자료를 조사하여 실증적으로 분석하였다. 분석 결과는 외국계 기업들이 국내기업들에 비해 보다 공격적인 성향을 나타내고, 경쟁자의 공격에 대한 대응에 있어서는 상대적으로 적은 정도의 반응과 느린 의사결정속도를 보여주고 있다. 하지만, 공격이나 대응행위의 실행속도에서는 두 집단 간에 유의미한 차이가 없음을 나타내고 있다. This research addressed the question of how foreign firms differ in their competitive behaviors from local rivals in an industry. Predictions were tested with a sample of 12 major life insurance companies in Korea over 9 years, from 1999 to 2007. Results support that the existence of differences in competitive behaviors between foreign firms and local firms. Foreign firms more aggressively initiated competitive actions and they were less likely and slower to respond when attacked by rivals. Contrary to predictions, there exists no significant difference between groups in both action and response execution speed.