애널리스트 예측이 주가지체에 미치는 영향에 관한 연구

최희정,김민수 한국재무관리학회 2020 財務管理硏究 Vol.37 No.4

Contrary to the perfect capital market hypothesis, substantial theoretical and empirical researches demonstrate that stock price adjusts to information with delay and this effect is asymmetric. In this paper, using parsimonious measure of price delay suggested by Hou and Moskowitz (2005), we investigate the firm-level relation between analyst forecasting and stock price delay. Our research question is how analyst forecasting impacts the stock price delay. With a sample of Korean lasted and non-financial firms for the period of 2001 through 2018, we find that firms with analyst coverage and larger number of analyst followings are more likely to incorporate information with less delay. We further examine how the analyst forecasting quality, proxied by forecast error and optimistic bias, is related to the stock price delay. We find that firms with poor forecasting quality are associated with significantly greater price delay. These results are consistent with the hypothesis that analyst play a crucial role in price formation process and informational quality affect timely adjustment of information. These findings are robust to alternative measures of analyst forecasting and price delay as well as the use of firm fixed effect. As an additional test, we examine whether these relations vary with the firm size and ROA. In particular, only when firms have no analyst followings, firms with larger size and higher ROA is associated with low level of stock price delay. This finding confirms slow diffusion of bad news of firms with small size and less analyst followings, as studied in Hong et al.(2000), Hou(2007) previously. 본 연구는 애널리스트의 예측활동, 예측오차 및 낙관적 편의가 주가지체에 미치는 영향을 분석하였다. Hou and Moskowitz(2005)는 개별 기업의 수익률에 영향을 미치는 시장수익률의 현재 및 과거값의 비율에 의해 주가지체 변수를 구성하여, 정보가 개별 주식에 전파되는 속도를 측정하였다. 본 연구에서는 이러한 방법론에 따라 기업-연도별로 주가지체의 크기를 측정하였으며, 2001년부터 2018년까지 유가증권시장 및 코스닥의 제조업 기업을 대상으로 애널리스트 예측이 주가지체에 미치는 영향을 분석하였다. 분석 결과 애널리스트 커버리지가 존재하고 분석기관수가 증가할수록 주가지체가 감소하며, 예측오차 및 낙관적 편의가 크게 존재할수록 주가지체가 감소함을 관찰하였다. 이는 애널리스트가 제공하는 정보의 정확성이 향상될수록 새로운 정보가 신속하게 주가에 반영되어 주가지체가 감소하는 것을 의미한다. 이러한 결과는 Pooled OLS와 고정효과 모형, 다양한 측정변수의 사용에도 강건하게 관찰되며, 동적 패널 분석을 통해 내생성을 통제한 후에도 성립한다. 논문의 추가분석에서는 유가증권시장과 코스닥 시장에서 주가지체 현상에 차이가 있는지 분석하였으며, 기업규모와 영업의 수익성이 이러한 관계에 미치는 영향을 분석하였다. 분석결과 애널리스트가 주가지체에 미치는 영향에서 시장에 따른 차이는 없으나, 유가증권시장에서는 낙관적 편의의 효과는 유의하지 않은 것이 관찰된다. 또한 기업규모가 크고 수익성이 호전될수록 주가가 신속하게 반응하는 관계는 애널리스트 예측이 존재하지 않는 경우에만 유의하게 관찰되어, 정보 전파에서 애널리스트가 제공하는 정보가 수행하는 역할을 확인할 수 있다.

Preparation of surface modifiers for multi-walled carbon nanotubes through nitroxide mediated polymerization technique and their application in counter electrodes for dye-sensitized solar cells

최희정,이기원,김경곤,박남규,홍성철 한국고분자학회 2008 한국고분자학회 학술대회 연구논문 초록집 Vol.33 No.2

리빙리디칼중합법을 통한 다중벽 탄소나노튜브용 표면개질제의 합성 및 이를 이용한 염료감응태양전지 대전극 제조

최희정,홍성철 한국고분자학회 2008 한국고분자학회 학술대회 연구논문 초록집 Vol.33 No.1

간호대학생의 치매정책인식과 치매태도에 미치는 영향요인

최희정,권영채 국제문화기술진흥원 2020 The Journal of the Convergence on Culture Technolo Vol.6 No.2

The purpose of this study was to identify the factors that influence the dementia and recognition of dementia policy of nursing students. The participants were 184, 1∽2 grad of nursing students of K university in G city. The data were collected from May 1 to May 31, 2017, and analyzed using the SPSS/WIN 21.0 program with one-way ANOVA, t-test, Pearson correlation coefficients and multiple stepwise regression. The general characteristics, such as dementia attention and dementia ward intent to work had a significant influence on dementia attitudes. The level of dementia attitudes, recognition of dementia policy, dementia knowledge and attitudes toward older adults were more than moderate. The correlations among recognition of dementia policy, dementia knowledge, attitudes toward older adults and dementia attitudes were significant. These variables showed an explanation rate 23.4% and recognition of dementia policy(β=.22), dementia attention(no)(β=-.20), dementia ward intent to work(no)(β=-.16), dementia knowledge(β=.15) were statistically significant among the variables that influenced dementia attitudes. It is necessary to develop a systematic dementia education program that can raise dementia knowledge, positive attitude, and recognition of dementia policy of nursing college students. 본 연구의 목적은 간호대학생의 치매정책인식과 치매태도에 영향을 미치는 요인을 파악하는 것이다. 대상자는 G 도시 K 대학 간호 학생 1∼2학년, 184명이었다. 자료수집은 2017 년 5 월 1 일부터 5 월 31 일까지였고, SPSS / WIN 21.0 프로그램을 사용하여 one-way ANOVA, t-test, Pearson 상관계수 및 다중단계 회귀분석을 하였다. 대상자의 일반적 특성에 따른 치매태도는 치매에 대한 관심과 치매병동 근무의향에 따라 차이가 있었다. 치매정책인식, 치매지식, 노인태도와 치매태도 정도는 보통 이상이었고, 치매정책인식, 치매지식, 노인태도 및 치매 태도에서는 모두 정상관관계가 있었다. 치매태도에 영향을 미치는 영향요인은 치매정책인식(β = .22), 치매에 관심없다(β =-. 20), 치매병동 근무 의향 없다(β =-. 16), 치매지식(β = .15)이었고, 설명력은 23.4 %였다. 따라서 올바른 치매지식, 긍정적인 치매태도, 간호대학생의 치매정책인식을 높일 수 있는 체계적인 치매 교육 프로그램을 개발해야 한다.

중년층의 일반적 특성에 따른 치매정책인식,치매지식,치매태도 및 치매예방행위 차이분석

최희정,김지숙 국제문화기술진흥원 2020 The Journal of the Convergence on Culture Technolo Vol.6 No.3

The purpose of this study is to analysis of the difference between dementia policy perception, dementia knowledge, dementia attitude and dementia prevention behavior of middle-aged. The subjects were 217 middle-aged in their 40 to 60 years old who lived in D and G cities. The mean sore of were dementia policy perception 75.42±8.52, dementia knowledge 8.71±1.90, dementia attitude 28.55±5.10, dementia prevention behavior 27.04±3.35. Dementia knowledge were significant differences in gender, number of diseases, source of dementia information. Dementia attitudes were significant differences in gender, age, education, dementia in family, dementia living together, job status, early examination, source of dementia information. Dementia prevention behavior were significant difference in dementia living together and early examination. The most category of dementia prevention behavior was ‘cigarette smoking(Inverse question)’, and blood pressure and diabetes management’ were the lowest. Therefore, development of a professional and systematic dementia education program to raise the awareness of dementia policy among middle-aged adults and form the right dementia knowledge and positive dementia attitude. Development of customized dementia prevention behavior programs to maintain cognitive activities, social activities, proper eating habits, and health care is needed. 본 연구는 중년층의 일반적 특성에 따른 치매정책인식, 치매지식, 치매태도 및 치매예방행위 차이분석을 위한 것이다. D시와 G시에 거주하는 40대에서 60대까지 중년층 217명을 대상으로 하였고, 구조화된 설문지로 자가설문조사를 수행하였다. 연구결과 대상자의 치매정책인식 정도는 75.42±8.52, 치매지식은 8.71±1.90, 치매태도는 28.55±5.10, 치매예방행위는 27.04±3.35이었다. 대상자의 일반적 특성에 따른 치매정책인식은 유의한 차이가 없었고, 치매지식은 성별, 질환 수, 치매정보 원천에서 유의한 차이가 있었으며, 치매태도는 성별, 나이, 학력, 가족 중 치매, 치매가족 동거, 직업상태, 조기검진, 치매정보 원천에서 유의한 차이가 있었다. 또한 치매예방행위는 치매가족 동거, 조기검진에서 유의한 차이가 있었다. 치매예방행위의 세부항목 순위는 ‘당신은 담배를 피우십니까?(역문항)’가 가장 높았고, ‘당신은 평상시 혈압이나 당뇨관리 등 질환관리를 하십니까?’는 가장 낮은 것으로 나타났다. 따라서 중년층의 치매정책인식을 높이고 올바른 치매지식, 긍정적 치매태도를 형성할 수 있는 전문적이고 체계적인 치매교육 프로그램 개발과 인지활동, 사회활동, 올바른 식생활 습관, 건강관리 등을 형성 및 유지할 수 있는 맞춤형 치매예방행위 프로그램 개발이 필요하다.

유튜브 크리에이터의 팬 활동 및 동기에 대한 탐색적 연구 - 혼합 연구 방법론의 활용 -

최희정,한상린,박태영 서비스마케팅학회 2021 서비스마케팅학회 학술대회 발표논문집 Vol.2021 No.11

한국에서의 발작성야간혈색소뇨증에 대한 임상적 고찰

최희정,이순남 梨花女子大學校 醫科大學 醫科學硏究所 1995 EMJ (Ewha medical journal) Vol.18 No.3

배 경 : 발작성야간혈색소뇨증은 적혈구가 보체계에 민감해져 혈관내 용혈을 일으키는 드문 후천성용혈성빈혈로, 평균 수명은 약 10년정도이나 더 장기간 생존한예들을 경험하여 이를 포함한 종합적인 임상고찰을위하여 본 연구를 하였다. 방 법 : 1979년 12월부터 1994년 12월까지 이화여자대학교의과대학 부속병원 내과에서 경험한 6례와 국내문헌에 보고된 29례를 포함한 35례를 대상으로 임상적특징 및 치료, 경과 등에 대해서 고찰하였다. 결 과 : 1) 연령분포는 16∼61세로 평균 30세였고, 남자 21례, 여자 14례로 남녀비는 1.5 : 1이었다. 임상증상발현후 확진까지의 기간은 3일에서 40년까지 매우다양하였고 진단까지 5년이상 소요된 경우가 22.9%였다. 임상증상은 기록이 있던 14례중 13례에서 빈혈증상, 수면후 갈색뇨 10례, 황달 5례, 복통 3례, 출혈4례가 있었다. PNH로 확진되기전까지의 타진단명은재생불량성빈혈이 14례, 용혈성빈혈 5례, 간질환 4례,철결핍성빈혈 3례, 특발성혈소판감소성자반증 1례,재생불량성빈혈이 경과중 PNH로 전환된 경유가 2례있었다. 2) 진단당시의 혈색소치는 전례에서 12g/dL미만을보였고 평균 7.3g/dL이었다. 백혈구감소는 5례, 정상8례, 증가는 1례였고, 평균 4,100/mm^3, 평균 혈소판수는 106,OO0/mm^3로 감소를 보였다. 망상구수는 평균4.3%로 증가를 보였고 골수소견상 세포증가 3례,감소 2례, 정상 4례였고 전례에서 적아구계 증식을보였다. Ham's test는 14례중 13례에서 양성이었고,sucrose hemolysis test는 시행한 10례 모두에서 양성이었다. 혈청 haptoglobin은 3례중 2례에서 감소를보였다. 3) 35례중 수혈은 26례에서 시행되었고 그중 세척적혈구가 13례에서 투여되었고 철분은 14례, 엽산10례, dextran 5례, busulfan 1례, 부신피질 호르몬제26례, 남성호르몬제 15례와 항응고제가 3례에서 투 여 되 었다. 4) 합병증은 7례에서 발생하였고 감염 3례, 뇌혈관경색 2례, 급성 신부전증 2례였다.5) 33례중 생존 19례,사망 4례,추적 안된 경우가10례였고 추적기간은 0.3~ 115개월이고 가장 장기간생존한 례는 41년 10개월이었다. 결 론 : PNH환자들의 임상 특징 및 장기 생존자들의 특성상, 검사소견에 PNH특성이 남아 있더라도 보존적치료와 합병증의 예방 및 치료에 힘쓰면 비교적 오래생존할 수 있어 계속적인 추적관찰과 치료가 필요하며이에 대한 연구가 필요하다. Background : Paroxysmal nocturnal homoglobinuria is an uncommon acquired hemolyticanemia and characterized by increased sensitivity of erythrocytes to the lytic action of comptement system, developing intravascular hemolysis. PNH is complicated by anemia, infectionand thrombosis. The more prolonged survival comparable to literature was noted and so, weperformed this study. Method : The previously reported twenty nine cases and six cases were collected at EwhaWontons University Hospital from Dec.1979 to Dec.1994 and were analyzed for clinical characteristics and progress. Result : 1) The age distribution was ranged from 16 to 61 years with mean of 30 years andmale to female ratio was 1.5 : 1. The duration from the onset of symptoms to diagnosis wasranged from 3 days to 40 years and above 5 years was 22.9%. The subjective symptoms attributable to anemia were in 13 cases, to dark urine after sleep in 10 cases, to jaundice in 5 cases,to abdominal pain in 3 cases, to hemorrhage in 4 cases. The various diagnoses made beforePNH were aplastic anemia in 14 cases, hernolytic anemia in 5 cases, liver disease in 4 cases,iron deficiency anemia in 3 cases, idiopathic thrombocytopenic purpura in 1 cases, reversedcases from aplastic anemia to PNH in 2 cases. 2) Laboratory data showed ; (1) anemia(Hg below 12g/dL) in 35 cases with mean of 7.3g/dL. (2) leukocytopenia(below 4,000/mm^3) in 5 cases, leukocytosis in 1 case with mean 4,100/mm^3except patient with chronic myelocytic leukemia. (3) thrombocytopenia(below 150,000/mm^3) in 10 cases with mean 106,000/mm^3. (4) reticulocytosis(over 2.0% ) in 20 cases with mean 4.3%. (5) Bone marrow examination revealed hypocellular in 2 cages, normocellular in 4 cases,hypercellular in 3 cases and erythroid hyperplasia in all cases. (6) positive Ham's test in 13 cases among 14 cases. (7) positive sucrose hemolysis test in 10 cases anions 10 cases. (8) decreased serum haptoglobin in 2 cases among 3 cases. 3) The treatment was consisted of blood transfusion in 26 cases among 35 cases, especiallywashed RBC in 13 cases, iron in 14 cases, folic acid in 10 cases, dextran in 5 cases, busulfanin 1 case, corticosteroid in 26 cases, androgen in 15 cases and anticoagulant in 3 cases. 4) The observed complications were infection in 3 cases, cerebral infarct in 2 cases andacute renal failure in 2 cases. 5) The nineteen patients were still alive, four patients dead, ten patients were lost duringfollow-up period. The duration of most prolonged survival case was 41 years 10 months. Theywere fo11owed from 0.3 to 115 months. Conclusion : In analyzing the characteristics of PNH patients and prolonged survivals, thedata reported suggest, although the laboratory abnormalities persisted in the prolonged survival,the prognosis will be good if conservative tretment and prevention of complication is tried.

Sex Differentiation and Early Gonadogenesis in Sebastes inermis Cuvier

최희정,오승용,명정구,김종만,허준욱,박민욱,박인석 한국해양과학기술원 2008 Ocean and Polar Research Vol.30 No.4

Early gonadal development and sexual differentiation of dark-banded rockfish (Sebastes inermis Cuvier) were followed from parturition to 400 days post parturition (dpp). During this period, average total length (TL) increased from 0.57 to 13.18 cm. Primordial germ cells (PGCs) were first detected at 0.68 cm TL (10 dpp). When fish reached 1.52 cm TL (50 dpp), initial stages of ovarian differentiation were identified by the presence of PGCs containing condensed chromatin and their transformation into meiotic oocytes. At 10.23 cm TL (300 dpp), the ovaries gradually developed into oocytes in the primary yolk stages. Ovary growth was rapid after sex differentiation, but testis tissue continued to multiply without growing until fish reached 6.97 cm TL (200 dpp), after which the production of spermatocytes, spermatogonia, and cyst cells was apparent. Histological analysis of gonadal structure suggested a gonochoristic sexual development pathway. Our analysis of the sex ratio at 400 dpp showed a significantly higher proportion of males. Early gonadal development and sexual differentiation of dark-banded rockfish (Sebastes inermis Cuvier) were followed from parturition to 400 days post parturition (dpp). During this period, average total length (TL) increased from 0.57 to 13.18 cm. Primordial germ cells (PGCs) were first detected at 0.68 cm TL (10 dpp). When fish reached 1.52 cm TL (50 dpp), initial stages of ovarian differentiation were identified by the presence of PGCs containing condensed chromatin and their transformation into meiotic oocytes. At 10.23 cm TL (300 dpp), the ovaries gradually developed into oocytes in the primary yolk stages. Ovary growth was rapid after sex differentiation, but testis tissue continued to multiply without growing until fish reached 6.97 cm TL (200 dpp), after which the production of spermatocytes, spermatogonia, and cyst cells was apparent. Histological analysis of gonadal structure suggested a gonochoristic sexual development pathway. Our analysis of the sex ratio at 400 dpp showed a significantly higher proportion of males.

Relationship between the Clinical Characteristics and Intervention Scores of Infants with Apparent Life-threatening Events

최희정,김여향 대한의학회 2015 Journal of Korean medical science Vol.30 No.6

We investigated the clinical presentations, diagnostic and therapeutic modalities, and prognosis from follow-up of infants with apparent life-threatening events (ALTE). In addition, the relationship between the clinical characteristics of patients and significant intervention scores was analyzed. We enrolled patients younger than 12 months who were diagnosed with ALTE from January 2005 to December 2012. There were 29 ALTE infants with a peak incidence of age younger than 1 month (48.3%). The most common symptoms for ALTE diagnosis were apnea (69.0%) and color change (58.6%). Eleven patients appeared normal upon arrival at hospital but 2 patients required cardiopulmonary resuscitation during the initial ALTE. The most common ALTE cause was respiratory disease, including respiratory infection and upper airway anomalies (44.8%). There were 20 cases of repeat ALTE and 2 cases of death during hospitalization. Four patients (15.4%) experienced recurrence of ALTE after discharge and 4 patients (15.4%) showed developmental abnormalities during the follow-up period. The patients with ALTE during sleep had lower significant intervention scores (P = 0.015) compared to patients with ALTE during wakefulness and patients with previous respiratory symptoms had higher significant intervention scores (P = 0.013) than those without previous respiratory symptoms. Although not statistically significant, there was a weak positive correlation between the patient’s total ALTE criteria and total significant intervention score (Fig. 2, r = 0.330, P = 0.080). We recommend that all ALTE infants undergo inpatient observation and evaluations with at least 24 hr of cardiorespiratory monitoring, and should follow up at least within a month after discharge.

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최희정 샘터사 2010 월간 샘터 Vol.488 No.-