A Study on Improvement Plans for the Cultural Industry Cluster of Seoul Digital Media City

Joonghyuk Bang,Jaewoong Kim 중앙대학교 영상콘텐츠융합연구소 2014 TechArt :Journal of Arts and Imaging Science Vol.1 No.1

Dual-Class Stock Splits and Liquidity

Joonghyuk Kim,Ji-Chai Lin,Ajai Singh,Wen Yu 한국재무학회 2008 한국재무학회 학술대회 Vol.2008 No.11

We examine liquidity effects of dual-class stock splits that change firms’ ownership structure from one share one vote to two classes with disparate voting rights. Following dual-class splits, effective spreads, price impacts, and order execution difficulty increase and the investor base decreases significantly for both superior- and inferior-voting shares. In contrast, following a matched sample of regular splits, the investor base increases and order execution improves significantly. Pursuant to the adoption of extreme form of corporate governance and weakened shareholder rights, and consistent with the implied effects of a deteriorating information environment, we find that dual-class splits adversely affect stock liquidity.

NFC 기반 주문 관리 시스템 설계 및 구현

장중혁(JoongHyuk Chang) 인문사회과학기술융합학회 2018 예술인문사회융합멀티미디어논문지 Vol.8 No.4

지난 수년간 컴퓨터와 IT 기술의 발달은 다양한 분야에서 업무 처리 절차를 개선하여 효율성을 높이는데 기여하고 있다. 특히, 대다수 사람들이 활용하고 있는 스마트폰의 다양한 통신 기능 및 센싱기능 등을 활용하여 생활 속 편의성를 제고하는 다양한 시스템들이 지속적으로 연구 및 제안되고 있다. 본 논문에서는 스마트폰에 내재된 NFC 기능을 이용하여 주변에서 흔히 접할 수 있는 소매형 매장에서 활용될 수 있는 메뉴 주문 및 관리 시스템을 제안한다. 제안되는 시스템에서는 각 매장의 메뉴 정보 제공, 주문 접수 및 메뉴 제공 관리 등의 서비스를 스마트폰을 매개로 효과적으로 처리할 수 있도록 지원한다. 특히, 메뉴 정보 제공 및 주문 접수 등에 있어서 NFC 기능을 활용함으로써 불필요한 노동을 줄일 수 있도록 지원한다. 또한, 주문 내역들을 하나의 데이터베이스로 관리함으로써 메뉴별 판매현황 분석 등을 지원한다. 이러한 기능들을 통해 자영업자 등이 운영하는 소매형 매장의 경쟁력 제고에도 기여할 수 있을 것이다. In the past few years, the advancement of computer and IT technologies have contributed to the improving business efficiency in various work processing. In particular, many systems using functions of communicating and sensing in smart-phones have been proposed actively. In this paper, an order management system for restaurants and retailing stores is proposed, which uses NFC technique in smart-phones. In the proposed system in this paper, functions for showing menus, taking order of customers, and serving items are efficiently processed by an application in a smart-phone, which is based on NFC technique. It can help to reduce labor force in showing menus and taking order of customers. In addition, sales analysis can be easily obtained by managing menus and ordering information in a database. By the mechanism, the proposed system may help to improve of competitive power of a small stores by owner-operators.

Biochemical and physiological mode of action of tiafenacil, a new protoporphyrinogen IX oxidase-inhibiting herbicide

Park, Joonghyuk,Ahn, Young Ock,Nam, Jeong-Won,Hong, Myoung-Ki,Song, Namsook,Kim, Taejoon,Yu, Gyung-Hee,Sung, Soon-Kee Academic Press 2018 Pesticide biochemistry and physiology Vol.152 No.-

<P><B>Abstract</B></P> <P>We conducted biochemical and physiological experiments to investigate the mode of action of tiafenacil (Terrad'or™), a new protoporphyrinogen IX oxidase (PPO)-inhibiting pyrimidinedione herbicide. Analysis of the half-maximal inhibitory concentration (IC<SUB>50</SUB>) against recombinant PPO enzymes from various plant species, including amaranth (<I>Amaranthus tuberculatus</I>), soybean (<I>Glycine</I> max), arabidopsis (<I>Arabidopsis thaliana</I>), and rapeseed (<I>Brassica napus</I>), showed that tiafenacil had an IC<SUB>50</SUB> of 22 to 28 nM, similar to the pyrimidinedione herbicides butafenacil and saflufenacil and the <I>N</I>-phenylphthalimide herbicide flumioxazin. By contrast, tiafenacil exhibited 3- to 134-fold lower IC<SUB>50</SUB> values than the diphenyl ether herbicides fomesafen, oxyfluorfen, and acifluorfen. Tiafenacil is non-selective and is herbicidal to both dicots and monocots, such as the weeds velvetleaf (<I>Abutilon theophrasti</I>), amaranth, and barnyardgrass (<I>Echinochloa crus-galli</I>) as well as the crops soybean, rapeseed, rice (<I>Oryza sativa</I>), and maize (<I>Zea mays</I>) at concentrations ranging from 1 to 50 μM. Treatment of plant tissue with tiafenacil in darkness resulted in the accumulation of protoporphyrin IX. Subsequent exposure to light increased the content of malondialdehyde and significantly decreased the Fv/Fm values of chlorophyll fluorescence. The results suggest that tiafenacil is a new PPO-inhibiting pyrimidinedione herbicide.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We investigated the mode of action of tiafenacil (Terrad'or™). </LI> <LI> This new pyrimidinedione herbicide inhibits protoporphyrinogen IX oxidase. </LI> <LI> Tiafenacil had a much lower IC<SUB>50</SUB> values than diphenyl ethers. </LI> <LI> Tiafenacil is non-selective and herbicidal against both monocots and dicots. </LI> <LI> Tiafenacil causes protoporphyrin IX accumulation and oxidative damage to plants. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

嶽麓書院藏秦簡의 卒令

任仲爀(Im, Joonghyuk) 동양사학회 2020 東洋史學硏究 Vol.150 No.-

秦漢시기 詔書의 律令化

任仲爀(Im, JoongHyuk) 중국고중세사학회 2016 중국고중세사연구 Vol.42 No.-

무선네트워크 제어 시스템의 최신 연구동향

유준혁 대구대학교 정보통신연구소 2012 情報通信硏究 Vol.9 No.1

본 논문은 무선 네트워크 제어 시스템(Wireless Networked Control System)의 최신 연구동향을 제시한다. 일반적으로 유선 네트워크 제어 시스템(Networked Control System)에서 극복하지 못한 다양한 문제점들을 간단하게 해결할 수 있어, 무선 네트워크 기반의 제어 시스템을 선호하는 추세이며 이러한 많은 장점들이 있지만 개선해야할 문제점도 많다. 본 논문에서는 보완해야 할 다양한 문제점을 극복하기 위해 관련된 연구가 이루어지고 있는 동향을 제시한다.

일 농촌지역의 정신지체 역학연구

박준혁,남정현,신영전 大韓神經精神醫學會 2000 신경정신의학 Vol.39 No.1

연구논문: 일 농촌 지역의 정신지체 환자의 유병율, 사회 경제적인 특징, 동반질환을 조사하여 농촌지역에서의 정신지체 환자의 현황과 분포 특성을 살펴보고 지역사회 안에서 이들의 관리를 위한 기초자료를 제공하고자 한다. 방 법: 경기도의 1군과 4개 면을 선정하여 이 지역 전체주민 17,237명을 대상으로 정신지체 조사 사업을 시행하였다. 조사는 1차, 2차로 나누어 1차 조사는 사전에 교육을 받은 보건진료소장과 보건요원에 의해 정신지체 환자를 조사하도록 하는 핵심요원조사(Key Informant Research) 방법으로 2차 조사는 보고된 대상자를 확진하기 위해 정신과 전문의 1명 정신과 전공의 2명, 임상심리사 5명이 이들 대상자를 직접 면담하여 진단의 확진과 등급의 정도를 파악하였다. DSM-Ⅳ의 기준과 한국형 웩슬러 지능검사(K-WAIS), 사회성숙도검사(SMS)를 시행하여 진단하였다. 결 과: 조사지역의 정신지체 유병율은 0.42%이었고, 남자가 0.37%, 여자는 0.47%로 여자가 더 높은 유병율을 보였지만 통계적으로는 유의미한 차이는 없었다(χ²=4.3. p=0.23). 등급별로는 경도, 중등도, 중도, 최중도의 비율은 33:47:18:3로써 중등도 정신지체가 가장 많았다. 연령별 유병율을 보면 조사 대상의 20-39세에서 0.69%로 가장 높은 유병율을 보였고, 40세 이상의 유병율은 0.35%로서 두 군 사이에 통계적인 유의미한 차이(χ²=18.64. p=0.00002)를 보였다. 중등도의 정신지체가 전체 정신지체 환자중에서 0.20%로 가장 높은 유병율을 보였다. 정신지체의 일차보호자는 부모가 69%를 차지하였고, 장애자 수첩 소지자는 전체 정신지체의 50%, 평균 교육기간은 3.36년이었다. 결 론: 조사지역의 정신지체 유병율은 0.42%로 우리 나라 과거 유병율 보다 높은 결과였고 등급별 분포에서 경도의 정신지체가 상대적으로 낮은 비율을 보였는데 1차 조사인 핵심요원조사(Key Informant Research)에서 정신지체 발견의 초점을 사회적 적응능력의 저하에 두어, 농촌사회에서 적응력을 갖는 경도의 정신지체가 많이 누락되었을 것으로 추정된다. 중등도의 정신지체가 전체 정신지체 환자 중에서 가장 높은 분포를 보였는데, 이는 중등도 정신지체가 경도의 정신지체보다 사회적 적응능력의 저하가 훨씬 두드러져서 발견 탈락율이 적고 실제로 중도와 최중도보다 빈도가 높기 때문이다. 중도이상의 정신지체는 거의 대부분 40대 이전에 동반된 질환, 여러 가지 내과적 문제로 사망하기 때문에 본 연구에서도 낮은 유병율를 보였고, 전반적으로 정신지체인의 사회적 지지가 매우 부족하였다. Objectives: This study was designed to assess the present conditions of the mental retardation in a rural area by identifying the prevalence, socioeconomic characteristics and combined diseases of the subjects with mental retardation. Methods: For this survey, four regions of a rural area with total population of 17,235 persons were chosen. The surveys were divided into 2 steps. After Key Informant Research(KIR) at first survey, one psychiatric specialist, two psychiatric residents and five clinical psychologists interviewed the high risk group who had been selected in KIR. By this two-step process, final diagnosis and degree of severity were confirmed. Diagnostic criteria of Mental Retardation by DSM-Ⅳ(Diagnostic and Statistical Manual of Mental Disorders-Ⅳ), K-WAIS, Social Maturation Scale were used as diagnostic tools. Results: Prevalence of Mental Retardation in survey areas was 0.42%. The prevalencies in male and female were 0.37% and 0.47%, respectively, which were of no significant statistical difference. The relative ratio of each degree of mental retardation-mild, moderate, severe and profound mental retardation-was 33:47:18:3 respectively. The prevalence of moderate mental retardation was higher than that of any other degrees. By age groups, the prevalence in twenties and thirties was 0.69%, which was the highest of all age groups. The prevalence in forties and over was 0.35%, which was the lower than that of twenties and thirties(χ²=18.64, p=0.00002). Conclusions: Prevalence of mental retardation in survey areas was 0.42%, which was higher than any other previous studies in Korea. The prevalence of mild mental retardation was relatively lower than that of other previous studies, which means that the key informants may not have detected the subjects with mild mental retardations who were relatively socially adaptive in rural areas, because they might have focused on the ability of social adaptation as an important feature in detecting the mental retardations. The prevalence of moderate mental retardation was 0.20%, higher than any other groups, which resulted from low rate of failure in the detection of the moderate mental retardations because of their severe deficits in social adaptation and from the higher prevalence than severe and profound mental retardation in reality. The prevalence of severe and profound mental retardation was low rate because they used to be short-lived due to combined medical illnesses and congenital anomalies. The persons with mental retardation were in low socioeconomic status and had poor supporting systems.

Special Purpose Acquisition Company (SPAC) : the initial return and the announcement effect

Minjung Park,Joonghyuk Kim 한국재무학회 2019 한국재무학회 학술대회 Vol.2019 No.11

This study examines the characteristics of Korean SPAC and target companies and how the market reacts to these features based on the events of SPAC’s IPO and merger announcement. First, using 144 SPAC sample from 2010 to 2018, we find that the structure of the sponsor and institution investors are important elements for the positive initial returns of SPAC. Second, using 119 merger announcement sample, we find evidence that the market considers the target firm’s quality based on the incentives of SPAC sponsors and managers. We figure out the inverted U-shape relation between the time-to-announcement and the market reactions and negative relation of deferred fees and SPAC performances. The market does not favorably react to the announcement at the early stage of SPAC and when the deadline of SPAC becomes closer after the certain points, and when the deferred fee of an underwriter is high. This is related to the incentives of managers or underwriters to seek the target regardless of its quality. Besides, the market prefers the mature, more profitable, and Bio related companies as the target of SPAC.

Business Group and Its Effect on Financial Distress Risk

( Yunxiao Liu ),( Joonghyuk Kim ),( Woochan Kim ) 한국재무관리학회 2016 財務管理硏究 Vol.33 No.3

This study empirically examines the influence that business group exerts on the financial distress risks of non-business group member firms. Using an index developed by Liu et al. (2016) as a measure of business group influence at industry level, we show that the stronger the business group influence is, the higher the financial distress risk of non-business group member firms in the same industry and the entire industry is. We also find that the influence of business group comes from the existence of the internal capital market among business group member firms. The influence of business group is stronger for non-business group member firms with high degree of financial constraint and when the external capital market experiences a negative shock. Overall, these results indicate that the existence of business group could be detrimental to the financial health of other firms in the economy.