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      • KCI등재

        Measuring the value of mobile telecommunication services using a choice-based approach

        김용재,박민수 대한경영학회 2023 大韓經營學會誌 Vol.36 No.3

        Consumer usage patterns in mobile telecommunication services are shifting from simple voice calls to data-centric services through mobile Internet. Broader usage of mobile telecommunication services has increased the value of these services. Thus, it is necessary to investigate the shift in consumer utility value along with changes in usage patterns. The purpose of this study is to objectively analyse the value of mobile telecommunication services to determine the role of mobile telecommunication services in the smartphone era. Specifically, we use a conjoint analysis to estimate the elasticity of demand through a consumer survey. Conjoint analysis measures the impact on consumer choice and calculates the utility of each service attribute. To accomplish this, we classify the types of current mobile telecommunication services into six categories: voice calls and text messages, information services, mobile SNS , mobile shopping and commerce, mobile banking, and entertainment. We then quantify the value of mobile telecommunication services and the surplus from subscribing to a mobile service plan for each use by using data from a conjoint survey. We also find that this value and surplus are larger for relatively new services. The results imply that the value of mobile telecommunication services becomes multifaceted and higher as consumer usage of telecommunication services in everyday life increases significantly. Our results also offer insights into the drivers of telecommunication services with relevant implications.

      • SCOPUSKCI등재

        요소수지합판(尿素樹脂合板)의 증량에 관한 연구

        김용재,이필우,김은변 한국목재공학회 1976 목재공학 Vol.4 No.1

        This study was carried out to know the adaptability of barley flour, potato flour and white ash as extender and filler of urea-formaldehyde resin for plywood as a substitute material of wheat flour. The extenders and filler used at this study were extended by several groups of percentages. Shear strength, moisture contents, and specific gravities were compared among tested groups. The results obtained are summarized as follows. I) Wet and dry shear strength of plywoods extended by 10% barley flour, 30% potato flour, and wheat flours were shown better results than non extended plywoods. 2) There was no significant difference between plywoods extended until 50% barley flours and non extended plywoods. 3) Shear strength of plywoods extended by 50% potato and 100% barley flours were shown worse result than non extended. 4) Dry and wet shear strength of plywoods extended by white ash were shown worst result. 5) The plywoods extended by potato flours were shown nat only better shear strength, but also considered more profitable cost for extending.

      • 극한 무선통신 환경을 위한 Delay Tolerant Network 개념설계에 관한 연구

        김용재,송유재 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11

        본 논문에서는 극한의 무선통신 환경을 위한 delay tolerant network (DTN) 관련 기술의 동향을 살펴보고, 극한 환경 중 남극과 같은 저온환경에서의 무선통신 네트워크 구축에 있어 고려해야 하는 점들을 제시하고 논의하고자 한다. 논의한 결과를 바탕으로 극한 환경을 위한 DTN 개념을 설계하고자 한다.

      • 일본의 개인과징금제도에 관한 소고 —2004년 도입된 증권거래법의 관련 규정을 중심으로—

        김용재 한국금융법학회 2007 金融法硏究 Vol.4 No.2

        Japan introduced the civil money penalty system against individuals to the Securities Exchange Act on June of 2004, which was fundamentally modeled on the U.S. Financial Law. The system was effective on April 1 of 2005. Individuals who have been in violation of the most important provisions under the Securities Exchange Act, in particular ones who are in the course of manipulation, insider trading, or non-disclosure of material information, may be subject to severe civil money penalties besides forfeitures, seizures, and criminal penalties. The Japanese Congress overcame lots of hurdles when introducing the new system, such as the most serious issue like a double jeopardy or a due process concern. This paper aims to the introduction of a similar system in Korea, thereby remarkably suppressing securities-related crimes. The japanese reform in the field of the capital market has been applauded and evaluated as a challenging trial and the best practice by other circles. For instance, based on the Securities Act and regulations, the Fair Trading Commission in Japan has studied and pursued more sophisticated and refined civil money system against individuals who are lurking behind corporations or corporate groups but are initiating illegal activities and practices for the anti-competition and the concentration of their economic powers in a relevant market. Constitutional issues including a double jeopardy problem are also the most interesting topic when researching this system. All of these issues will be deeply discussed in the Japanese Context.

      • KCI등재

        하이에크의 화폐경제 이론에 있어서 시제균형에 관한 연구

        김용재 한국산업경제학회 2010 산업경제연구 Vol.23 No.4

        하이에크가 시제균형의 개념을 발전시키게 된 이유는 기존의 무시간적인 정태이론과 단순한 화폐수량설이 시간에 걸친 연속적 의사결정에 의해 발생되는 현실의 동학적 모습을 잘 보여주지 못한다는 사실 때문이었다. 따라서 하이에크의 화폐경제 모형에 관한 특징을 두 가지 문제로 요약할 수 있다. 첫째, 하이에크가 일관되게 채택한 균형 개념은 시제 균형이었다. 여기서 저축과 투자가 일치한다는 의미의 시제균형은 시제소비선호와 이에 대응되는 시제자원배분이 일치되고 있음을 의미한다. 시간에 따른 생산계획과 소비계획의 조정문제는 자본시장의 이자율 구조를 통해 이루어지는데 가장 단순한 모형은 하이에크의 삼각형이다. 이와 같은 시제자원배분의 문제가 구체적으로는 시간에 걸친 생산구조의 형태문제를 제기하며 이에 대한 기초이론이 뵘바베르크의 자본이론이다. 그리고 하이에크에게 있어서 생산구조의 교란이 경기변동의 핵심문제가 되며 경제위기의 근본적 원인인 생산구조의 축소는 시제소비선호와 일치되지 않는 시제자원배분에 대한 잘못된 의사결정의 결과이다. 둘째, 하이에크는 데이터의 변화 또는 화폐적 변화에 따른 경제주체의 기대들을 어떻게 변화시키는 가하는 문제이다. 그는 데이터의 변화와 화폐적 변화를 명확히 구분하였다. 하이에크는 데이터의 변화에 의한 경우에는 가격기구의 자연스런 자기조정 메커니즘이 작동한다고 가정하였다. 하이에크는 이러한 데이터의 변화에 의한 예측오류들은 시장에서의 가격선호와 이윤동기에 의해 곧바로 드러나게 되며, 이는 체계적인 왜곡을 발생시키지 않을 것이라고 판단하고 있었다. 반변 화폐적 교란에 의한 예측 오류의 발견은 비교적 오랜 시간이 경과하고 경제전반에 걸쳐 오류가 확산된 이후 그 화폐적 요인이 사라지자마자 기존의 기대들은 실패하게 된다. What made Hayek develop the concept of Intertemporal Equilibrium was that existing statistic theories that omitted time-element did not explain the actual dynamic movements caused by successive decision-making over time. Therefore, Hayek defined Intertemporal Equilibrium as equilibriums including the time and expectation, and he also tried to explain the changes in expectations of economic agents caused by changes in data or money, which resulted in the disturbances or shifts in the existing expectation-equilibrium. Firstly, see the problems in the definition of equilibrium including expectations as a method, which import the time element in the economic model. Hayek consistently adopted Intertemporal Equilibrium as an expectation equilibrium. Here Intertemporal Equilibrium as the equality in investment and saving means that intertemporal preferences and the corresponding intertemporal allocation of resources in consistent with each other. The intertemporal preferences and the corresponding intertemporal allocation of resources are coordinated by the structure of interests in capital goods markets. This simple mode is the Hayekian Triangle. here Problem in intertemporal allocation of resources makes a quest for concrete types of the structure of production over time. Therefore, in Hayeks' business cycle theory, the disturbance or changes in the structure of production has been the key problem, and retrenchment of structure of production as the primary cause of the economic crisis will be caused by the inconsistent intertemporal allocation of resources with the intertemporal preference. Secondly, the problem is how the agents' expectations are changed by real disturbances and monetary disturbances. Hayek explicitly made a distinction between the effect of real disturbances and that od monetary disturbances. Hayek suggested that the expectation-errors caused by real disturbances would be discovered sooner or later by the price signals and individual profit-motives, and this will not caused systematic errors. Therefore, Hayek assumed that the natural coordination mechanism of price system would properly operate in case of real disturbance. But Hayek's business cycle theory was a modification of Intertemporal Equilibrium.

      • KCI등재

        A study on the Developing Strategy for Remove/Ease the TBT

        김용재 사단법인 인문사회과학기술융합학회 2016 예술인문사회융합멀티미디어논문지 Vol.6 No.5

        This paper purpose make to remove and to easy TBT of smart city related good such as IT, S/W, IOT, Home network between Korea and China. Research methodology is review 2nd data analysis and focus group Interview ( Government officer, Professor and CEO). This paper compare & analyze International rule & system as follow. First, It is to compare & analyze the smart city system, technical regulation, standard, Test & certification procedure and Inspection. Second, it is review electric/electronic Test, certification and calibration. Third, it is analyze MRA between Korea and china, SDoC, Mutual Acceptance of International certification such as ILAC(APLAC) and IEC CB scheme. This paper intends to draw conclusion and make implication as follows. First, we must promote FTA, MRA. Second, we make to remove and to easy TBT by MRA between Korea and China.Although the MRA is a system where all parties that have concluded agreement enjoy the advantage, Korea is under a state of concluding only the stage 1 agreements(exchange test & certification document among countries) with 5 countries such as United States, Canada, Chile, Japan and Vietnam.

      • KCI등재

        남부지방에서 벼 재배형태별 분얼체계 및 수량구성형질의 차이에 관한 연구 I. 묘종류와 육묘시기에 따른 묘소질 및 본답 생육의 변화

        김용재,신해룡,장강연,Kim, Yong-Jae,Shin-Hae-Ryong,Chang, Gang-Yeon 한국작물학회 1992 한국작물학회지 Vol.37 No.3

        To study the effects of different nursing methods and transplanting on the growth of the rice plant(Oriza sativa L.hn southern region of Korea, Kumo-byeo, Palgong-byeo and Dong-jinbyeo were transplanted from April 20 to July 20 with 15 days intervals as 8 days seedling (infant rice), 25 days box seedling for machine transplanting and 45 days conventional seedling, respectively. No. of leaves at transplanting were in order of 45 days seedling>25 days seedling>8 days seedling. In 25 days seedling, they were increased as transplanting dates were later from April 20 to June 5, and in 45 days seedling, it showed same tendency until June 5 with Dongjinbyeo, June 20 with Palgong-byeo and Kumo-byeo. Root activity according to the $\alpha$-naphthylamine oxidation activity and rooting activity were higher in order of 8 days seedling>25 days seedling>45days seedling. Panicle formation initiated after maximum tillering stage as transplanting at April 20 with 8 days seedling and 25 days seedling, but it intiated before maximum tillering stage as transplanting at July 20 in Kumo-byeo. and in Palgong-byeo intiations of panicle formation were shown after maximum tillering stage as transplanting until May 20, but June 5 in Dongjin-byeo. However, there was no significant tendency with 45 days seedling. Missing hill ratio were less than 5% as transplanting with 8 days seedling and 25 days seedlingregardless of transplanting periods or varieties.

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