• Proceedings of the Korea Database Society Conference
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• 2008.05a
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• pp.321-338
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• 2008

Information and communication industry, which shows rapid growth rate, is now leading the global economic growth, contributing a ripple effect on general business and economic structure. It is said that information and communication industry enables swift economic growth taking a role as a basic industry of information-oriented society. Especially, rapid technical innovation promotes mutual growth of other related industries and it is technology-intensive. The purpose of this research is to analyze the management efficiency of information and communication industry using DEA method, and finally suggest numerical value for inefficient organizations to improve their efficiency. CCR-I, BCC-I efficiency and RTS(Returns to scale) of 29 companies engaged in information and communication industry was evaluated. With the results, I suggested model companies for benchmarking in information and communication industry. To summarize, 7 companies were selected with CCR-I efficiency rate 1, and 12 companies with BCC-I efficiency rate 1. RTS was finalized with 8 IRS companies, 10 DRS companies, and 11 CRS companies.

• Proceedings of the CALSEC Conference
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• 2003.09a
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• pp.307-312
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• 2003

업계의 배경 ■ 주 5일제 근무를 맞이한 레저와 여행산업의 시장규모 증가 ■ 2002년 이후 항공권, 호털 등을 포함한 여행상품이 정자상거래 분야에서 가장 높은 매출액을 올릴 것이라고 전망했다. (eMarketer 2002/03) ■ Biz여행 예약도 6개월 동안 2배규모로 성장 (Greenfield Online (2000/5/28)) ■ 1999년 현재 온라인 여행시장에서 항공 여행의 비중은 80％ → 2003년에는 60％ (렌터카, 호텔 예약의 비중이 높아짐) (Jupiter Communication (1999/5/17)) ■ 3/4의 인터넷 사용자가 시간표, 비행편, 가격, special deal을 탐색하기 위해 방문, 70％의 응답자가 좀더 시스템이 유연해진다면, 온라인 구매 의도 있다고 응답(가능한 여앵편, 좌석 선정 가능, 비행시의 특식 등의 욕구) (Gartner Group (2000/1/7)) ■ 75％의 응답자가 오프라인보다 온라인에서의 여행 브랜드가 중요하다고 응답함, Travel Industry Association of America (98. 99년 자료) ■ 개별여행자 (F.I.T)의 급증과 온라인을 통한 예약이 증가 (관광정보 연구원, 2002)(중략)

• Special Issue of the Society of Naval Architects of Korea
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• 2011.09a
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• pp.17-20
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• 2011

The International Association of Classification Societies (IACS) had developed the Common Structural Rules (CSR) for bulk carriers as per the needs noted above. ISO and IMO GBS (Goal-Based Standards) are now being developed in this regard. This study has been prepared to verity the strength of forward cargo hold of 82,000 DWT class bulk carriers. A cargo hold/tank 3-D FE model was established to assess the structural adequacy of the primary structural members with the loading conditions. Full breadth model was established for the analysis considering asymmetric nature of structural layout and loading conditions. To summarize this result of structural assessment based on IACS CRS for bulk carrier, it is benefit to design this kind of bulk carriers and to study the strength assessment for the similar type of bulk carriers.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2004.10a
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• pp.99-115
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• 2004

From the growth of Internet technology, many e-commerce principles have been introduced in airline industry. The computer reservation systems(CRS) is the first real-time business application and considered as the earliest examples of e-commerce. In airlines, the early e-business activity was to build the web site for providing flight information to customers. Recently, many airlines are expanding the capability of the web site for selling tickets on the web to make use of the cheaper distribution channel. In this paper, we focus on the impacts of airline e-business being implemented in airline distribution channels. Using the conjoint analysis, we suggest a model for estimating the change of market sales for each distribution channel. With the empirical survey, we can find some implications on the e-business strategy and the effective internet marketing tools for airlines.

• The Journal of Fisheries Business Administration
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• v.24 no.2
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• pp.69-82
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• 1993

The purpose of this paper is to estimate production function in the coastal fishing, especially long bag set net fishing and trap fishing using Cobb-Douglas production function with the three main variables: fishing quantity per tonage(WQFP), the number of working persons per tonage(WEMP), and the number of utilized fishing equipments per tonage(WEQU). The statistical results of such estimation reveal that fishing quantity per tonage can be expressed as a function of the number of working persons per tonage and the number of utilized fishing equipments per tonage. The estimated coefficients of WEMP and WEQU are statistically significant and also satisfy the requirements of Cobb-Douglas production function. This study also estimates marginal rate of technical substitution of labor in terms of capital (MRT $S_{LK}$ )in each long bag set net fishing and trap fishing. The resuits of this study show us that trap fishing has the technical characteristic of constant returns to scale(CRS) but long bag net fishing has that of decreassing returns to scale(DRS).

• Journal of Industrial Technology
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• v.32 no.A
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• pp.87-94
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• 2012

For soils with high void ratios, the inverse method of utilizing results obtained from centrifuge model test was used to find the constitutive relation of effective stress - void ratio - permeability whereas conventional oedometer test and constant rate of strain consolidation(CRS) test about settlement of interface and pore pressure and distribution with time were compared with numerically estimated values to confirm such a constitutive relation as obtained from the inverse method. As results of numerical method, the volumetric ratio and reclamation velocity were obtained for the reclamation condition.

• Proceedings of the Korea Association of Information Systems Conference
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• 1998.10a
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• pp.178-187
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• 1998

전략정보시스템의 성공사례로서 항상 제시하고 있는 것이 항공사의 CRS이다. 처음 CRS가 출현했을 때 항공사들은 CRS를 통해서 그렇지 않은 항공사에 비해 상당한 전략적 우위를 지킬 수 있었다. 그러나 현재의 경우 이러한 CRS의 전략적 활용의 예는 그다지 중 요한 의미를 갖지 못할 수 도 있다. 왜냐하면 이제 어느 항공사(서비스제공자)나 어느 여행 사(사용자)의 경우도 이러한 CRS를 활용하지 않는 경우는 없기 때문이다. 그렇다고 해서 CRS가 전략적 가치가 전혀 없다고 단정 지울 수 없다. 만일 특정의 CRS가 다른 CRS와의 차별화 된 기능을 갖고 있다면 그것은 충분한 전략적 가치가 있다고 볼 수 있다. 즉, 보다 다양한 기능, 광범위한 데이터 량, 풍부하게 제공되는 정보 그리고 사용상 편리성 등의 특 성을 가진 CRS는 전략적 의미가 있는 것이다. 본 연구는 이러한 입장에서 CRS의 차별화 된 전략적 특성을 파악하기 위하여 AMADEUS에 대한 사례연구를 수행하였다. 사례를 분석 한 결과 일부 차별적인 기능에 대해서는 전략적 특성을 갖고 있다고 볼 수 있었다.

• International Journal of Railway
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• v.1 no.2
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• pp.37-44
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• 2008

Safe, fast, efficient and effective railway is a main factor of economic development level of every country. This paper uses the DEA method to evaluate and compare the efficiency of 12 Regions of RAI. In addition, we introduce the reference(s) unit(s) for every inefficient region, and determine the amount of input decrease and/or output increase need to become them efficient. Findings indicate that in 2006, 4 regions of 12 are in Constant Return to Scale (CRS) status and 7 of them in Variable Return to Scale (VRS), and the average efficiency is 0.730 and 0.888, respectively. In other words, RAI works 27 percent under its capacity. More over results indicate that Hormozgan, Khorasan, Tehran and Isfahan Regions have the most efficiency respectively. The results show that the 8 regions, have been working in Increaser Return to Scale and 4 reminder Regions in Decrease Return to Scale. According to this results, we submit the suitable suggestion for improve the efficiency of the inefficient regions.

• The Bulletin of The Korean Astronomical Society
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• v.36 no.1
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• pp.45.1-45.1
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• 2011

Shock waves form in the intergalactic medium as a consequence of accretion, merger, and turbulent motion during the structure formation of the universe. They not only heat gas but also govern non-thermal processes through the acceleration of cosmic rays (CRs), production of magnetic fields, and generation of vorticity. We examine diffusive shock acceleration of the pre-existing as well as freshly injected populations of nonthermal, CR particles at weak cosmological shocks. Since the injection is extremely inefficient at weak shocks, the pre-existing CR population dominates over the injected population. If the pressure due to pre-existing CR protons is about 5 % of the gas thermal pressure in the upstream flow, the downstream CR pressure can absorb typically a few to 10 % of the shock ram pressure at shocks with the Mach number M<3. Yet, the re-acceleration of CR electrons can result in a substantial synchrotron emission behind the shock. The implication of our findings for observed bright radio relics is discussed.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.49 no.2
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• pp.136-140
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• 2004

Twenty-one lowland rice genotypes were evaluated for their stability parameters with respect to grain yield in a multi locational trial at five different sites of Eastern India viz. CRRI, Cuttack (Orissa); OUAT, Bhubaneswar (Orissa); CRS, Masodha (UP); RAU, Pusa (Bihar) and RARS, North Lakhimpur (Assam). Pooled analysis of variance reflects existence of genotype x environment interactions and contribution of both linear and nonlinear components to genotype (G) x environment (E) interactions. Through stability parameter analysis it was found that Rayda $\textrm{B}_3$, CR 778-95 and CR 661-236 were suitable for over all environments where as Sabita, OR 1334-16 and OR 1358-RGA-4 were suitable for rich environments. PSR 1209-2-3-2, CR 780-1937, Ambika, OR 877-ST-4-2 and CR 662-2211 were identified for poor environments.