무소음 가진기를 이용한 자동차 시트의 진동특성 재현 평가

이경태(Kyungtae Lee),최두석(Dooseuk Choi),전용두(Yongdu Jun),이유종(Yujong Lee),최상민(Sangmin Choi) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11

This study is a reproduced vibration performance of vehicle seat using quite excitation system. The noise and vibration that often occurs when driving at different speeds by different road condition. The vibration of road test measure is separate 4point seat mounting and the vehicle out of 2point using accelerometers. The measured time data transfer PSD data for exciter profiles. A quite excitation system operate the vehicle body under the identical condition, road test by PSD data. Compares are a transferred PSD date of a measured vehicle seat and a mesured excitation system. Finally, the reproduced ratio is evauated via the total PSD level.

운전자 하차 조건에 따른 자동차 시트의 체압 분포에 대한 연구

이경태(Kyungtae Lee),김진우(Jinwoo Kim),김용준(Yongjun Kim),최두석(Dooseuk Choi) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5

체압 분석을 이용한 허리 지지대의 성능 평가에 관한 연구

이경태(Kyungtae Lee),김진우(Jinwoo Kim),김용준(Yongjun Kim),최두석(Dooseuk Choi) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5

Through research and technology to give back support Lumbar support, which relieve fatigue, feel the comfort and convenience devices that can stay in the vehicle have been applied to the car seat. Selected by the test methods to 2000㏄-class car seat with 2way type and 4way type were carried out by each body female tester AM5%, men AM50%, AM95% tile as a test target. Install the body pressure mat on the seat and the seat after seat tester Based on the load distribution by the Lumbar support operation produces a index line. Check the load distribution in the body and ensure an optimized operating position. Validate the performance and reliability of each index line obtained through a test body and optimal index line.

자동차 시트의 체압 분석을 이용한 승·하차 동작 재현성 평가에 관한 연구

이경태(Kyungtae Lee),김진우(Jinwoo Kim),김용준(Yongjun Kim),최두석(Dooseuk Choi),이유종(Yoojong Lee) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5

This research was confirmed the harsh are as applying to seats according to vehicle ingress egress motion of a driver by the distribution test of body-pressure intended mass production of 2.000[cc] vehicles and test participants of AM5% AM 50%, AM 95%. Ingress egress motion was assorted into seven kinds of general movement. Based on the body-pressure distribution data of the analysis ingress egress motion was produced ingress egress mode using robot ingress egress endurance testing machine. Correlation graphs were analyzed for the a driver and reappearance mode of a robot.

내부회계관리제도의 취약점 공시가 내부자 매도거래에 미치는 영향

이경태(Kyungtae Lee),최종원(Jongwon Choi),한재훈(Jaehoon Hahn),박주형(Juhyoung Park) 한국관리회계학회 2017 관리회계연구 Vol.17 No.1

본 연구의 목적은 내부회계관리제도의 취약점(이하 취약점)이 시장에 공시되기 이전에 내부자가 미래 손실을 회피하기 위하여 사적정보를 이용한 내부자 매도거래를 일으키고 있는가를 검증하는데 있다. 본 연구는 코스닥시장 상장 기업 중 내부자거래가 이루어진 기업들을 대상으로 분석을 실시하였다. 분석결과 첫째, 취약점이 보고된 기업에서 그렇지 않은 기업에 비해 취약점 검토의견이 공시되기 이전에 내부자 매도거래를 보다 적극적으로 일으키고 있음이 발견되었다. 이러한 결과는 취약점 공시 이전에 내부자가 사적 정보를 이용하여 보유주식을 실제로 매도하고 있음을 확인해주는 결과이다. 둘째, 내부회계관리제도의 중요한 취약점에 대한 공시일수록 취약점 공시이전에 내부자거래량이 보다 적극적으로 증가하고 있음을 발견하였다. 뿐만 아니라 내부회계관리제도의 자료 미제시(이하 자료미제시)로 인한 취약점 검토의견 표명거절의 경우 내부자매도 거래량이 중요한 취약점에서 보다 더 높아지는 것을 확인할 수 있었다. 자료 미제시의 경우 여러가지 취약점이 존재하거나 그 취약점의 정도가 심각하기 때문에 자료를 제출하지 않았을 가능성이 크며, 이는 내부자가 취약점에 관한 사적정보를 지니고 있음을 의미한다. 따라서 자료미제시의 경우 다가올 손실을 회피하고자 취약점이 공표되기 이전에, 중요한 취약점에서 보다 많은 매도거래를 일으키고 있는 것으로 해석된다. 셋째, 자료미제시가 보고된 기업일수록 다른 취약점 의견에 비해 상대적으로 이른 시점에 내부자매도거래를 일으키고 있음이 검증되었다. 이러한 결과는 자료미제시 공시가 기업가치 하락에 보다 직접적인 영향을 미칠 수 있으므로, 내부자가 손실회피를 위해 매도거래를 보다 사전에 적극적으로 일으키고 있음을 의미한다. 추가적으로 취약점이 공시된 기업의 주가수익률은 그렇지 않은 기업에 비해 취약점 공시 이후 보다 큰 폭으로 하락하고, 주가하락현상은 취약점의 정도가 중요해짐에 따라 강해지는 것을 확인하였다. 이는 미래에 발생할 손실의 크기에 따라 내부자들이 차별적으로 주식을 매도하고 있음을 의미한다. 또한 산업-기업규모별 대응표본을 구성한 후 가설을 재검증한 강건성 검증을 실시하여 일관된 결과를 도출함으로써 본 연구 결과의 신뢰성을 높여주었다. 본 연구는 선행연구들과 다음과 같은 차별성 및 공헌점을 지닌다. 첫째, 내부회계관리제도가 시장에 제공할 부정적 정보에 대하여 내부자가 이를 미리 인지하고 주식을 거래 하는가를 살펴보았다는 데 그 의미가 있다. 둘째, 구체적으로 내부회계관리제도와 내부자거래와의 관련성을 살펴본 연구는 찾아볼 수 없으므로, 이에 본 연구의 결과는 학계와 실무에 의미 있는 실증적 증거를 제시하고 있다고 판단된다. 또한 최근 몇몇 기업에서의 사적정보를 이용한 내부자 매도거래에 대한 사회적 논란과 이슈가 증폭되고 있는 시점이라는 점에서도 본 연구의 결과는 자본시장의 정보이용자, 정보작성자, 감독기관 등에게도 중요한 시사점을 제공해줄 수 있을 것으로 보인다. The purpose of this study is to investigate insider trading behavior prior to the disclosure of internal control weaknesses. We use data on insider trading and internal control audit opinions for firms listed on the KOSDAQ market over the period of 2008-2012, and examine whether insiders, who are likely to be informed of their own weaknesses in internal control, try to avoid the expected losses following the disclosure of internal control weaknesses by trading their holdings prior to the announcement of audit opinions. Our main findings are as follows. First, we find that the insiders of the firms with internal control weaknesses tend to trade more than the insiders of the firms without internal control weaknesses. The association between insider trading behavior and the disclosure of internal control weaknesses is statistically significant for insider purchases as well as insider sales, but the association is stronger for insider sales. Second, when we focus on the disclosure of material weaknesses in internal control, the association of pre-announcement insider trading and internal control weakness announcement is statistically significant for insider sales but not for insider purchases. In addition, the statistically significant association between insider sales and the disclosure of material weaknesses is stronger when the disclosure of material weaknesses is due to a disclaimer of opinion because of management’s refusal to furnish a written assessment about the effectiveness of internal control over financial reporting. These results suggest that informed trading by insiders to avoid the expected losses from the negative stock price reaction mostly occurs when insiders anticipate that audit opinions of material weaknesses in internal control are highly likely. Third, we find that insiders’ sales occur earlier for the cases of a disclaimer of opinion due to the lack of internal control documents furnished by management than other cases of internal control weaknesses. This result suggest that informed trading to avoid losses occurs earlier when the likelihood of receiving audit opinions of material weaknesses in internal control is higher. In addition, we find that stock price reaction to the disclosure of internal control weaknesses is significantly negative. Moreover, the stock price decline is biggest for the cases of a disclaimer of opinion due to the unfurnished internal control documents by management. These results on stock price reaction are consistent with insider trading behavior of stronger selling for the cases of more severe internal control weaknesses. Lastly, we test our main hypotheses using a sample of firms matched by industry and size, and find that our results are robust to using this alternative sample. Prior research on internal control system mostly focuses on the relationship between the disclosure of internal control weaknesses and firms characteristics or on the effect of establishing the internal control system. This study expands the scope of previous research by examining whether firm insiders, who are likely to be informed of their own weaknesses in internal control over financial reporting, trade their holdings to their advantage in anticipation of the disclosure of internal control weaknesses. This paper presents empirical evidence of insider trading behavior prior to the disclosure of material weaknesses in internal control that should be of interest for academics and practitioners alike. Given the recent media attention on several prominent cases of insider sales seemingly based on private information, the results of this study provide important implications for capital market participants and regulators.

노면부하에 따른 차체 위치별 진동 특성 연구

이경태(Kyungtae Lee),이유종(Yujong Lee),전용두(Yongdu Jun),최두석(Dooseuk Choi) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5

Road load data are indispensable in the evaluation of BSR(Buzz, Squeak, and Rattle) of automotive parts/modules. However, there are uncertainties on the best measurement locations for representative body motion and it is especially true for seat systems. In the present study, we measure road loads at four different locations of body, i.e., A-pillars on the driver and passenger sides and left and right frame fronts of the front passenger seat in order to identify the acceleration behavior at different points. The measurements are conducted with passenger cars driving local roads at 50km/hr. The measured time-acceleration data then are transformed into PSD(power spectral density) data to compare the characteristics of local accelerations. Through the present experimentally obtained data, the behavior of road load accelerations at different body locations could be identified.

IFRS 도입이 관리회계 시스템에 미치는 영향: HM은행의 사례연구

이경태(제1저자) ( Kyungtae Lee ),신일항(교신저자) ( Ilhang Shin ),곽지영(공동저자) ( Jiyoung Kwak ) 한국회계학회 2015 회계저널 Vol.24 No.3

Banks are required to adopt Korean International Financial Reporting Standards (K-IFRS) in 2011. This adoption has caused a considerable change in financial accounting in the banking industry because K-IFRS requires the banks to adopt fair value accounting for the financial instruments, if possible. This change of financial accounting has brought a critical impact on management accounting because financial accounting information is the major source data in generating management accounting information. The management of the banks depends on its management accounting system in formulating strategy and organizing resources to achieve its goals and objectives in an efficient and effective manner, Therefore the adoption of IFRS has forced the management of the banks to make strategic decisions in designing its management accounting system, especially performance measurement system. HM bank, a leading local bank, has adopted K-IFRS in 2001. Financial accounting and management accounting are two major accounting system in HM bank. Two systems share an identical purpose which is to provide useful information in decision-making. However, they are aimed to serve different audiences, which distinguish them from each other. The purpose of management accounting in the bank is to support manegerial decision making by collecting, processing, and communicating information that helps management to plan, control, and evaluate business processes and bank``s strategy while financial accounting is to prepare the general-purpose financial statements used by various external users. With the adpotion of K-IFRS, HM bank management has organized an independent management accounting task force team (MATFT). MATFT is responsible to study the effects of K-IFRS on its management accounting system. MATFT has analyzed the effects using the following 4 steps approach. Step 1: List up the difference in accounting standards between K-GAAP and K-IFRS. Step 2: Identify IFRS topics which have considerable impact on management accounting information. Step 3: Finalize the management accounting topics to be changed. Step 4: Study on how theses changes to be reflected in the managementaccounting system, especially performance measurement system. As the results of the analysis, MATFT identified the following three topics to be changed in the management accounting system: (1) recognition of provision for credit losses, (2) recognition of interest receivable from overdue loans and (3) valuation of hybrid financial instruments. In other words, from MATFT ``s view, these three IFRS topics are considered as major issues which should be revised in the process of generating management accounting information. One of the most important elements of management accounting system in HM bank is performance measurement system of each branch. These three topics are chosen because performance measures (mainly profit measures) of the branches are heavily dependent on how these three topics are applied in calculating each branch``s profit. This case systematically describes HM bank``s process in identifying and reflecting the necessary changes of the management accounting system following the adoption of K-IFRS. As a management of HM Bank, how do you reflect these effects in designing management accounting system This case is aimed to analyze the effect of IFRS adoption on the design ofmanagement accounting system, especially performance measurement.

Information Asymmetry and Insider Trading in Family Firms

유정민(Jungmin Yoo),이경태(Kyungtae Lee) 한국회계정보학회 2013 한국회계정보학회 학술대회발표집 Vol.2013 No.1

This paper observes the differential information asymmetry and insider trading behaviors between family firms and non-family firms. Family shareholders are among the most doubtful groups to keep private information as insiders of the firms. Family firms have special ownership structure, which managers and owners integrate under the same interests together to increase their family’s wealth. With this ownership structure, family shareholders can easily monitor the management and share insider information among them. Families share the firms’ history and maintain their position as controlling shareholders for a long time. They also aim to keep their position in the future with the perspective of successfully passing it on to their descendants. Under these circumstances, family firms are largely likely to generate higher information asymmetry against outside shareholders. Thus, this study first examines the differences in the abnormal stock return and in the amount of insider trading between family firms and non-family firms to test their higher information asymmetry in family firms. On the other hand, insider trading is relevant to the maintenance of ownership and this is an important issue for family firms within their nature. Therefore, even if there were large opportunities for family shareholders to realize their gains from insider sales, they would rather give up their opportunities. In this regard, I examine the dynamics of the insider trading behaviors in family firms by comparing their insider purchases and sales; trading subjects between large shareholders and executives; and managerial ownership purposes and investment purposes of their trading. The insider trading data for those studies are obtained from FnGuide database. The data to define family firms are all collected manually from individual corporate filings through the DART system of the Korea Financial Supervisory Services. The rest of the financial data and stock return data are gathered from the KISVALUE database provided by NICE Information Service Co. and the TS2000 database provided by the Korea Listed Companies Association. The analyses are based on all insider purchases and insider sales within the market, and then categorized to distinguish them by insider trading shareholder types and by insider trading purposes. Further, the study compares the results with the samples excluding Chaebol firms, because Chaebol firms have some differential features from other family firms as they are large in scale and complex in their business operations and governances. The empirical results show that family firms generate higher abnormal stock returns from their insider purchases while no differential abnormal returns are observed from their insider sales. This may reflect the nature of family firms as they maintain their ownership prior to the realization of abnormal returns from their sales of stocks. Further, the analyses of shareholder types and trading purposes indicate that executives in family firms, when excluding Chaebol from the samples, do not generate higher abnormal returns compared to the executives in non-family firms; however, family large shareholders presented higher abnormal returns compared to the large shareholders in non-family firms. Regarding trading purposes, family firms present higher abnormal returns than non-family firms under the managerial ownership purposes and investment purposes in general, and the differences seemed to be larger under the investment purposes for individual shareholders’ trading and when excluding Chaebol from the samples. The results are expected to contribute to explain differential opportunities and incentives on insider trading between family firms and non-family firms.

Starin gage를 이용한 Seat 구동용 Leadnut의 성능평가

김대영(Daeyoung Kim),이경태(Kyungtae Lee),이상배(Sangbae Lee),전용두(Yongdu Jeon),오범석(Bumsuk Oh) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.5

In this experimental study, a strain gage system is used to evaluate leadnut performance for driving car seats. The tensile strain is measured at the leadnut which deforms the hole shape of leadnut from circle to ellipse. Therefore the driving force of leadscrew decreases by the deformed hole shape of leadnut. It could be concluded from this result that this experimental procedures are useful to find out the responsible mechanism that affects power seat leadnut performance.

메니에르 질병이 청력에 미치는 영향

오윤경(Yoonkyung Oh),이경태(Kyungtae Lee),한명준(Myungjoon Han),김남근(Namkeun Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12