• 산업공학
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• 제11권3호
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• pp.193-207
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• 1998

The agriculture and fishery share in the Korean GDP is continuously decreasing after 1960s. Furthermore the proportion of these industries in the GDP has diminished as low as 10 percent in recent years. However, the stockbreeding sector in these industries are considerably expanded. More than 50 percent of the whole farmhouses are involved in the livestock farming, and the stock farming portion is steadily increased in its size and scope. Thus, the mechanization and the automization of stockbreeding equipments are greatly required to reduce down production cost, as well as to win the competitiveness in the global market. From this aspect, developed in this paper is a stockbreeding management system (SMS) for dairy cattle, which can be used in small and medium sized dairy farms. First, the basic schema of the stockbreeding management system are addressed in view of stockbreeding management for individual dairy cattle. Electronic identification (EI) systems and sensory devices have changed stockbreeding management strategy from group stock control into individual stock control manner. The SMS receives stock body measurement data through the sensory devices such as weight, temperature, and milk conductivity meters. A common database then integrates those measuring data together so that the SMS can determine the appropriate solution on each stock's breeding such as feeding and milking. Thus, each stock can be supervised by a sophisticated SMS that provides the best solution to the stockbreeding throughout the stock's whole life-cycle. Secondly. six major submodules of the SMS, based on the EI and sensory devices, are proposed. They are individual stock management, disease management, health management, feeding management, milking management, and a propagation management submodule. Finally, a prototype system for the SMS is demonstrated. The system is developed using Delphi 2 client-server system run under the Windows 95 environment.

• 산경연구논집
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• 제10권12호
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• pp.35-42
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• 2019

Purpose : This study examines The impact of human resource investment in internal control on stock price crash risk. Effective internal control ensures that information provided is complete and accurate, financial statements are reliable. By overseeing management, internal control systems can reduce agency costs between management and outside parties. In Korea, firms have to disclose information about internal control systems. The working experience of human resources in internal control systems is also provided for interested parties. If a firm hires more experienced internal control personnel, it can better facilitate the disclosure of information. Prior studies reported that information asymmetry between managers and investors increases future stock price crash risk. Therefore, the longer working experience internal control personnel have, the lower probability stock crashes have. Research design, data and methodology : This study analyzed the association between the working experience of internal control personnel and crash risk using regression analysis on KOSPI listed companies for fiscal years 2016 through 2017. The sample consists of 1,034 firm-years of non-financial firms whose fiscal year end on December 31. Career spanning data of internal control personnel was collected from internal control reports. The professionalism(IC_EXP) was measured as the logarithm of the average working experience of internal control personnel in months. Negative conditional skewness(NSKEW) and down-to-up volatility (DUVOL) are used to measure firm-specific crash risk. Both measures are based on firm-specific weekly returns derived from the expanded market model. Results : We find that work experience in internal control environment is negatively related to stock price crashes. Specifically, skewness(NSKEW) and volatility (DUVOL) are reduced when firms have longer tenure of human resources in internal control division. The results imply that firms with experienced internal control personnel are less likely to experience stock price crashes. Conclusions : Stock price crashes occur when investors realize that stock prices have been inflated due to information asymmetry. There is a learning effect when internal control processes are done repetitively. Thus, firms with more experienced internal control personnel could manage their internal control more effectively. The results of this study suggest that firms could decrease information asymmetry by investing in human resources for their internal control system.

• 한국콘텐츠학회논문지
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• 제20권10호
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• pp.702-714
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• 2020

주식 투자는 재테크의 하나로 금리 인하와 비과세 제도의 축소에 따라 주목을 받기 시작했다. 그러나 투자에 전문적인 지식이 필요할 뿐 아니라 위험 부담이 크다는 단점이 있다. 따라서 주가 경향의 정확한 예측은 개인투자자에게나 주식 투자 관련 서비스를 제공하는 회사에 중요한 능력이며, 더욱 정확한 예측을 위한 연구가 활발히 진행 중이다. 그러나 예측 연구들의 공정한 비교와 최고의 예측 모델을 얻기 위한 하이퍼-파라미터의 최적화에는 예측 모델의 성능을 정확하게 평가하는 방법이 필요한데, 지금까지 예측 모델의 성능 평가에 대한 연구는 미진한 상태이며, 기존 방법들을 그대로 답습하고 있는 실정이다. 이에 본 논문에서는 주가 예측 모델 성능 평가를 측정기준과 데이터 구성의 관점에서 분석하고, 예측 불균형 비율을 이용한 주가 경향 예측 모델의 공정한 성능 평가 방법을 제안한다.

• 노동경제논집
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• 제34권1호
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• pp.33-69
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• 2011

본 연구는 기업수준에서 교육훈련스톡, 연구개발스톡, 특허출원스톡 추계를 통하여 교육훈련활동과 연구개발활동의 생산성 효과에 대하여 분석한다. 특히 교육훈련투자를 스톡으로 구축하여 추정에 이용함으로써 숙련의 자산성을 분석에 반영하였다. 교육훈련투자의 파급효과 분석시 기술적 근접도를 이용한 것과 동적패널 분석을 이용하여 장단기 효과를 구분한 것 역시 방법론상의 새로운 시도이다. 분석 결과, 교육훈련투자의 생산성 효과는 연구개발투자에 비해 상대적으로 더 큰 것으로 나타났다. 교육훈련활동과 연구개발 활동은 자체효과뿐만 아니라 파급효과와 장기효과를 통해 기업의 생산성에 큰 영향을 미친다.

• Journal of Forest and Environmental Science
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• 제32권2호
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• pp.120-128
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• 2016

Forest sequesters large terrestrial carbon which is stored in the biomass of tree and plays a key role in reducing atmospheric carbon. Thus, the objectives of the present study were to assess the growing stock, above ground biomass and carbon in trees of Ponda watershed of Rajouri district (J&K). IRS-P6 LISS-III satellite data of October 2010 was used for preparation of land use/land cover map and forest density map of the study area by visual interpretation. The growing stock estimation was done for the study area as well as for the sample plots laid in forest and agriculture fields. The growing stock and biomass of trees were estimated using species specific volume equations and using specific gravity of wood, respectively. The total growing stock in the study area was estimated to be $0.25million\;m^3$ which varied between $85.94m^3/ha$ in open pine to $11.58m^3/ha$ in degraded pine forest. However in agriculture area, growing stock volume density of $14.85m^3/ha$ was recorded. Similarly, out of the total biomass (0.012 million tons) and carbon (0.056 million tons) in the study area, open pine forest accounted for the highest values of 43.74 t/ha and 19.68 t/ha and lowest values of 5.68 t/ha and 2.55 t/ha, respectively for the degraded pine forest. The biomass and carbon density in agriculture area obtained was 5.49 t/ha and 2.47 t/ha, respectively. In all the three forest classes Pinus roxburghii showed highest average values of growing stock volume density, biomass and carbon.

• 산경연구논집
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• 제9권6호
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• pp.49-55
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• 2018

Purpose - This paper examines the effect of related party transactions on crash firm-specific stock price crash risk. Ownership of a typical Korean conglomerate is concentrated in a single family. In those entities, management and board positions are often filled by family members. Therefore, a dominant shareholder can benefit from related party transactions. In Korea, firms have to report related party transactions in financial statement footnotes. However, those are not disclosed in detail. The more related party transactions are the greater information risk. Thus, companies with related party transactions are likely to experience stock price crashes. Research design, data, and methodology - 2,598 firm-year observations are used for the main analysis. Those samples are from TS2000 database from 2009 to 2013, and the database covers KOSPI-listed firms in Korea. The proxy for related party transactions (RTP) is calculated by dividing total transactions to the related-party by total sales. A dummy variable is used as a dependent variable (CRASH) in the regression model. Logistic regression is used to explain the relationship between related party transactions and crash risk. Then, the sample was separated into two groups; tunneling firms and propping firms. The relation between related party transactions and crash risk variances with features of the transaction were investigated. Results - Using a sample of KOSPI-listed firms in TS2000 database for the period of 2009-2013, I find that stock price crash risk increases as the trade volume of related-party transactions increases. Specifically, I find that the coefficient of RPT is significantly positive, supporting the prediction. In addition, this relationship is strong and robust in tunneling firms. Conclusions - The results report that firms with related party transactions are more likely to experience stock price crashes. The results mean that related party transactions increase the possibility of future stock price crashes by enlarging information asymmetry between controlling shareholders and minority shareholders. In case of tunneling, it could be seen that related party transactions are positively associated with stock crash risk. The result implies that the characteristic of the transaction influences crash risk. This study is related to a literature that investigates the effect of related party transactions on the stock market.

• 기술혁신연구
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• 제25권3호
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• pp.265-297
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• 2017

본 연구는 연구개발스톡과 6개의 지식스톡(특허의 질적 가치)이 기업의 시장가치에 미치는 영향을 포함하는 연구모형을 설정하여 기업의 시장가치와의 상관관계를 분석하였다. 구체적으로 토빈Q 모형을 사용하여 우리나라 402개 기업의 미국특허등록 108,851건(연도관측치 2,795건)의 특허를 분석하였다. Hall모형의 확장 모형 분석결과, 연구개발스톡/자산, 청구항스톡/특허스톡, 인용스톡/특허스톡 등이 기업의 시장가치에 긍정적인 영향을 미치는 것으로 나타났으며, 유의수준이 높진 않지만 피인용스톡/특허스톡, 발명자스톡/특허스톡 등도 기업의 시장가치에 긍정적인 영향을 미칠 수 있는 것으로 분석되었다. 이러한 결과에 따라 특허경영시대에 특허의 질적 수준 고도화와 특허의 가치 제고를 위한 정책 방안이 마련되어야 할 것으로 보인다.

• Nuclear Engineering and Technology
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• 제48권5호
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• pp.1162-1173
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• 2016

In this paper, we describe a physicomathematical model of the processes that occur in a sodium circuit with a variable flow cross-section in the case of a water leak into sodium. The application area for this technique includes the possibility of analyzing consequences of this leak as applied to sodium-water steam generators in fast neutron reactors. Hydrodynamic processes that occur in sodium circuits in the event of a water leak are described within the framework of a one-dimensional thermally nonequilibrium three-component gas-liquid flow model (sodium-hydrogen-sodium hydroxide). Consideration is given to the results of a mathematical modeling of experiments involving steam injection into the sodium loop of a circulation test facility. That was done by means of the computer code in which the proposed model had been implemented.

• 동아시아식생활학회지
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• 제23권2호
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• pp.203-210
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• 2013

In this study, cod bone were used as the main ingredient of a stock that can be eaten with Korean dried noodles. The stock was produced with heating for 30, 40, 50, 60, or 70 minutes using high-pressure extraction methods. Moisture content, chromaticity, pH, sugar content, salinity, mineral contents, quantitative analysis, and overall acceptance were studied to determine the optimal heating time. In our result, S1 the showed highest water contents 98.10%, while S5 showed the lowest moisture content (97.47%). There were no significant difference in pH between samples, while salinity and sugar content increased with increases in heating time. In terms of mineral contents, sodium and potassium showed proportional difference with increases in heating time, however, magnesium, calcium, and iron did not change. The results from a quantitative analysis test showed that transparency, fishy smell, delicate flavor, savory flavor, salt taste, and umami taste became stronger with increases in heating time increase. From the above results, the overall taste of the stock increases with increases in high-pressure heating time. Specifically, S4 high-pressure heating scored the highest on appearance, flavor, taste, after-taste, and overall acceptance. Thus, 60 minutes of high-pressure heating time is most desirable when producing stock with cod bones as a main ingredient.

• 한국융합학회논문지
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• 제8권3호
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• pp.225-235
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• 2017

기업은 자기주식을 시장에서 직접 취득하는 방법과 신탁계약을 통한 간접 취득방법을 선택할 수 있는데, 두 방식에는 제도적인 차이가 존재하며, 따라서 자기주식을 취득하는 두 방식은 시장에 서로 다른 신호를 전달할 수 있다. 본 논문은 자사주 매입 방법과 추정자기자본비용(ICOE) 사이의 관계를 실증적으로 분석하였고, 연구의 결과는 다음과 같다. 첫째, 자사주 매입을 공시한 기업의 자기자본비용이 자사주 매입을 공시하지 않은 기업의 자기자본비용보다 통계적으로 유의미한 수준에서 낮게 나타났다. 이 결과는 여유현금흐름가설이나 자사주 매입이 체계적 위험과 투자지출의 감소에 따라 자기자본비용이 감소한다는 주장과 일치한다. 둘째, 자기주식을 직접 취득한 기업은 간접 취득한 기업에 비해 통계적으로 유의미하게 낮은 자기자본비용을 가지는 것으로 나타났다. 이러한 결과들은 시장참여자들이 서로 다른 자사주 매입 방식이 가지는 융합적 신호효과를 정확히 판단하여 이를 자기자본비용에 적절히 반영한다는 것이다.