• 아태비즈니스연구
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• 제15권3호
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• pp.139-172
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• 2024

Purpose - This study investigates the relationship between corporate ownership structure and technological innovation for Chinese listed firms. Specifically, we analyze four ownership characteristics: concentration, constraints, alignment, and foreign/domestic institutional investor ownership, and use patent applications to measure innovation. Design/methodology/approach - Employing a quantitative research design, this study uses panel data of Chinese listed companies during the period from 2015 to 2021. The empirical analysis relies on multiple regression models, including Tobit models and two-stage least squares estimation, to assess the relationship between corporate ownership structure characteristics and innovation. Robustness checks are conducted using lagged dependent variables and subgroup analyses based on firm age, ownership type, and stock exchange listing. Findings - First, it provides empirical evidence on the non-linear relationship between ownership concentration and innovation, suggesting that there is an optimal level of ownership concentration for promoting innovation. Second, it highlights the importance of equity constraints in influencing innovation, showing that both excessive and insufficient equity constraints can hinder innovation. Third, the study demonstrates the negative impact of aligned ownership and control on innovation, suggesting that separation of ownership and control may be beneficial for fostering innovation. Fourth, it sheds light on the differential impact of domestic and foreign institutional investors on innovation, suggesting that foreign institutional investors may play a more positive role in promoting innovation. Research implications or Originality - The significance of this study's results lies in the fact that we empirically analyze the relationship between corporate ownership characteristics and technological innovation, thereby suggesting the direction of a desirable corporate governance structure that listed companies should pursue depending on their circumstances. This research contributes to a deeper understanding of the ownership characteristics that influence technological innovation and provides valuable insights for policymakers and corporate managers.

• Nuclear Medicine and Molecular Imaging
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• 제42권5호
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• pp.375-382
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• 2008

갑상선암 환자의 방사성 요오드 치료를 위한 전 단계로 시행되는 저요오드식이는 표준화된 전처지 방법으로 사용되고 있고 그 시행방법에 관련된 권고들이 최근 생겨나고 있다. 한국은 상대적으로 요오드 섭취가 많은 지역이므로 권장된 요오드 배설 기준을 만족시키지 못할 수도 있다. 이 연구에서는 갑상선의 요오드 섭취를 억제시키는 약물의 제한, 조영제가 사용된 경우에서 최소 3개월 이후로 치료 일정을 정하기, 전담 영양사에 의한 2주간의 엄격한 저요오드식이 교육을 시행하였을 때, 식이 요오드섭취가 많은 한국 갑상선암 환자들에서 소변 요오드량이 적정 수준으로 감소하는 지에 대해 전향적으로 분석하고자 하였다. 방법: 2006년 11월부터 외부 병원에서 갑상선암 진단 후 갑상선 전절제술을 시행 받고, 잔여 갑상선 제거 목적으로 고용량 방사성요오들 치료를 위해 본 연구자들의 병원에 의뢰된 환자들 중 recombinant human thyrotropin 또는 levotriiodothyronine을 사용하는 경우를 제외한 환자들을 대상으로 하였다. 요오드 함유 약물이나 갑상선의 요오드 섭취를 제한할 수 있는 약물을 점검했고, 조영제가 사용된 경우 치료 일정을 최소 3개월 이후로 결정하였으며 전담 영양사에 의한 2주간의 엄격한 저요오드식이 교육을 시행하였다. 저요오드식이 전후로 24시간 소변 내 요오드량을 측정하여 비교하였다. 또한 소변 내 크레아티닌 수치를 이용해서 24시간 소변 채집이 보다 적절한 것으로 판단되는 하부군을 대상으로 24시간 소변 내 요오드량을 비교하였다. 결과: 총 51명이 최종 분석에 포함되었다. 모든 환자에서는 24시간 소변 요오드량이 저요오드식이 전후로 $787\;{\mu}g/d$에서 $85\;{\mu}g/d$로 감소가 되었고 74.4%에서 $100\;{\mu}g/d$ 이하의 결과를 보였다. 소변 채집이 보다 적절한 하부군 14례에서는 저요오드식이 전후로 $505\;{\mu}g/d$에서 $99\;{\mu}g/d$로 감소되었고 78.6%에서 $100\;{\mu}g/d$ 이하의 결과를 보였다. 결론: 갑상선암 환자들에서 잔여갑상선제거를 위한 방사성요오드 치료 전에 2주간의 엄격한 저요오드식이를 시행하여 전향적으로 분석했을 때 24 시간 소변 내 요오드량이 평균 $99\;{\mu}g/d$로 감소하였고, 78.6%에서 $100\;{\mu}g/d$이하의 값을 보였다. 따라서 식이 요오드섭취량이 많은 한국에서는 최소 2주 이상의 엄격한 저요오드식이가 고려되어야 하며, 환자의 순응도를 높이기 위한 체계적인 교육이 뒷받침되어야 한다.

• Radiation Oncology Journal
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• 제12권1호
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• pp.73-80
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• 1994

저자들은 1989년 12월부터 1993년 2월까지 108명의 비 소세포성 폐암환자를 대상으로 혈청내 NSE치가 방사선 치료에 미치는 영향을 평가하기위해 본 후향성 조사를 시행하였다. 병리학적으로 편평상피세포암이 86명으로 대부분을 차지했으며, 그외 3명의 점막 표피성암(mucoepidermoid carcinomas), 11명의 선암, 3명의 대 세포성암, 그리고 5명에서는 병리 조직형을 증명하지 못했다. 병기별로는 stage I에 8명, stage IlIA에 40명, stage lIIB에 60명이 속해 있었다. 환자는 혈청내 NSE(neuron specific enolase)치에 따라 두 군으로 나뉘었다. NSE치가 15ng/ml 이상은 증가군, 그 미만은 정상군으로 하였다. 모든 환자에서 주 치료는 방사선 치료이었다. NSE가 증가된 군에서 NSE측정치를 보면, 치료에 반응하는 환자에서 평균 NSE치는 반응이 없는 군보다 통계학적으로 유의하게 높은 수치를 보였다(28.5ng/ml vs 20ng/ml, p=0.01). 전체적으로 볼 때 2년 생존율은 23.6$ \% $였다. 방사선 치료반응에 따라 보면, 완전 관해, 부분 관해, 그리고 반응이 없는 군에서 2년 생존율은 각각 39.2$ \% $, 28.6$ \% $, 그리고 6.2$ \% $로 나타났다(p=0.001). NSE치가 증가된 군에서 2년 생존율은 14.6$ \% $, 정상인 군에서는 31.7$ \% $로 나타났다(=0.07). 치료에 대한 반응이 있는 환자만 고려했을 경우는 NSE치에 따른 생존율 차이가 더 현격했다. 전체적으로 볼 때, NSE치는 치료에 대한 반응과는 별 상관관계가 없었다. 그러나, 편평 상피세포암만 고려했을 경우, NSE치가 증가된 군에서 치료에 반응이 있는 환자가 더 많았다 (80$ \% $ vs 61$ \% $, p=0.05). NSE치와 전체 병기, 원발 종양의 병기, 그리고 임파선 병기는 통계학적으로 상관 관계가 없는 것으로 나타났다. 그러나, 대체로 NSE치가 증가된 군에서 임파선 병기가 좀더 진행된 경향을 보였다. 결론적으로, NSE치가 높은 비 소세포성 폐암은 치료에 대한 반응과 생존율을 포함한 임상 경과에 있어서 NSE치가 정상인 비 소세포성 폐암과는 다름을 알 수 있었다. 따라서, NSE치가 증가된 비 소세포성 폐암에서는 약물치료 및 방사선 치료의 병합요법이 요구되며, NSE치는 예후인자의 하나로서 가치가 있다고 보여진다.

• Journal of Oral Medicine and Pain
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• 제41권4호
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• pp.161-168
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• 2016

Purpose: Patients who suffer from rheumatic arthritis, fibromyalgia, other various inflammatory diseases and musculoskeletal disorders, which are all similar to temporomandibular disorders (TMD), have been complaining about changes in the level and type of pain in response to changes in weather conditions for a long time. Through an investigation about pain perception in TMD patients in response to weather conditions, our primary objective was to develop base materials for future studies on change in pain in response to meteorological factors. Methods: Among patients who presented with TMD to Department of Oral Medicine, Pusan National University Dental Hospital from August to October 2016, one hundred consecutive TMD patients diagnosed with TMDs according to Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) were recruited for the study and 28 patients were excluded according to exclusion criteria. Survey was done with the questionnaire and investigated whether there was any difference in incidence and level of pain in TMD patients between non-rainy and rainy days. Results: Among a total of 72 samples, 4 patients reported change in pain on rainy days rather than non-rainy days. Two patients from chronic group (joint and complex subgroup) reported increased pain on rainy days rather than non-rainy days but it was not statistically significant (p>0.05). One patient from chronic/muscle group reported the change in pain characteristics while pain intensity remained unchanged. One patient from acute/complex group reported decreased pain intensity. In comparison of the patients who reported increased pain on rainy days between acute and chronic groups, there were two reported cases and were both from chronic group only. There was a significantly higher chance of reporting increased pain on rainy days in chronic group than acute group (p<0.001). Conclusions: It is considered that TMD patients couldn't perceive the change in pain well in response to weather change on rainy days but some chronic patients could perceive the increase in pain in rainy days.

• Asian Pacific Journal of Cancer Prevention
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• 제15권8호
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• pp.3369-3375
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• 2014

Background: C-reactive protein (CRP), considered as a prototypical inflammatory cytokine, has been proposed to be involved in tumor progression through inflammation. Recent studies have indicated CRP as a progostic predictor for urological cancers, but the results remain controversial. Materials and Methods: A systematic search of Medline, Scopus and the Cochrane Library was performed to identify eligible studies published between Jan 1, 2001 and Sep 1, 2013. Outcomes of interest were collected from studies comparing overall survival (OS), cancer-specific survival (CSS) and relapse-free survival (RFS) in patients with elevated CRP levels and those having lower levels. Studies were pooled, and combined hazard ratio (HR) of CRP with its 95% confidence interval (CI) for survival were used for the effect size estimate. Results: A total of 43 studies (7,490 patients) were included in this meta-analysis (25 for RCC, 10 for UC, and 8 for PC). Our pooled results showed that elevated serum CRP level was associated with poor OS (HR: 1.26, 95%CI: 1.22-1.30) and RFS (HR: 1.38 95%CI: 1.29-1.47), respectively. For CSS the pooled HR (HR: 1.33, 95%CI: 1.28-1.39) for higher CRP expression could strongly predict poorer survival in urological cancers. Simultaneously, elevated serum CRP was also significantly associated with poor prognosis in the subgroup analysis. Conclusions: Our pooled results demonstrate that a high serum level of CRP as an inflammation biomarker denotes a poor prognosis of patients with urological cancers. Further large prospective studies should be performed to confirm whether CRP, as a biomarker of inflammation, has a prognostic role in urological cancer progression.

• Molecules and Cells
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• 제27권2호
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• pp.175-181
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• 2009

The myosin light chain kinase (MYLK) gene encodes both smooth muscle and nonmuscle cell isoforms. Recently, polymorphisms in MYLK have been reported to be associated with several diseases. To examine the genetic effects of polymorphisms on the risk of asthma and related phenotypes, we scrutinized MYLK by re-sequencing/genotyping and statistical analysis in Korean population (n = 1,015). Seventeen common polymorphisms located in or near exons, having pairwise $r^2$ values less than 0.25, were genotyped. Our statistical analysis did not replicate the associations with the risk of asthma and log-transformed total IgE levels observed among African descendant populations. However, two SNPs in intron 16 (+89872C> G and +92263T> C), which were in tight LD (|D'| = 0.99), revealed significant association with log-transformed blood eosinophil level even after correction multiple testing ($P=0.002/P^{corr}=0.01$ and $P=0.002/P^{corr}=0.01$, respectively). The log-transformed blood eosinophil levels were higher in individuals bearing the minor alleles for +89872C> G and +92263T> C than in those bearing other allele. In additional subgroup analysis, the genetic effects of both SNPs were much more apparent among asthmatic patients and atopic asthma patients. Among atopic asthma patients, the log-transformed blood eosinophil levels were proportionally increased by gene-dose dependent manner of in both +89872C> G and +92263T> C(P = 0.0002 and P = 0.00007, respectively). These findings suggest that MYLK polymorphisms might be among the genetic factors underlying differential increases of blood eosinophil levels among asthmatic patients. Further biological and/or functional studies are needed to confirm our results.

• Nutrition Research and Practice
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• 제12권2호
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• pp.160-165
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• 2018

BACKGROUND/OBJECTIVES: Korea is quickly becoming an aged society. Dementia is also becoming a vital public health problem in Korea. Cognitive impairment as a pre-stage of dementia shares most risk factors for dementia. The aim of the present study was to determine associations of serum levels of vitamins A, C, and E with the risk of cognitive impairment among elderly Koreans. SUBJECTS/METHODS: In this cross-sectional study, a total of 230 participants aged 60-79 years from Yangpyeong cohort were included. Cognitive function was assessed by the Korean version of the Mini-Mental State Examination for Dementia Screening. The logistic multivariable regression model was applied to determine the effect of serum vitamins A, C, and E on the risk of cognitive impairment. RESULTS: There was no significant association between the risk of cognitive impairment and serum levels of vitamin A and vitamin C. There was a significant odd ratio when the second tertile group of beta-gamma tocopherol level was compared to the first tertile group [odds ratio (OR) = 0.37, 95% confidence interval (CI) = 0.14-0.98, P for trend = 0.051]. In subgroup analyses, there were significant negative associations between beta-gamma tocopherol level and the risk of cognitive impairment in men (OR = 0.17, 95% CI = 0.03-0.87, P for trend = 0.028), non-drinkers or former drinkers (OR = 0.13, 95% CI = 0.02-0.66, P for trend = 0.025), and non-smokers or former smokers (OR = 0.27, 95% CI = 0.09-0.82, P for trend = 0.017). CONCLUSION: Serum beta-gamma tocopherol levels tended to be inversely associated with the risk of cognitive impairment. Further prospective large-scaled studies are needed to examine this association.

• 대한한방내과학회지
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• 제41권6호
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• pp.1231-1244
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• 2020

Objective: This study was conducted to report the glucose-lowering effect and safety of herbal extracts in patients with type 2 diabetes mellitus. Methods: We investigated 21 patients with type 2 diabetes mellitus who were administered Daeshiho-tang, Bojungikgi-tang, Jowiseunggi-tang, and Hoechunyanggyeok-san at Kyung-Hee University Korean Medical Hospital from 2014 to 2019. The hypoglycemic effect of the herbal extracts was assessed by comparing blood glucose levels, including fasting blood sugar (FBS) and 2-hour postprandial glucose (PP2) levels. For safety assessment, the effects of herbal extracts on liver and kidney function were analyzed by liver function tests, including aspartate aminotransferase (AST), alanine aminotransferase (ALT), and γ-glutamyltransferase (GGT), and kidney function tests, including blood urea nitrogen (BUN) and creatinine (Cr). Patients were stratified according to their glycated hemoglobin (<6.5 or >6.5) levels and the kind of herbal extract used for treatment. Results: After administration of herbal extracts, FBS and PP2 significantly decreased to 20.24 mg/dL and 35.0 mg/dL respectively. Subgroup analysis revealed that, regardless of the glycated hemoglobin level, FBS and PP2 were significantly reduced in both groups. The safety profile showed no significant difference before and after taking herbal extracts. Conclusions: Daeshigo-tang, Bojungikgi-tang, Jowiseunggi-tang, and Hoechunyanggyeok-san may show the further glucose-lowering effects on patients with type 2 diabetes mellitus who have already treated with anti-hyperglycemic agents.

• 한국노년학
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• 제39권4호
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• pp.825-846
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• 2019

본 연구는 국내의 20~39세 청년층을 중심으로 연령주의 유형을 파악하고, 나아가 이 유형이 세대간 갈등 및 노인복지정책 인식에 미치는 영향을 파악하는 것에 목적을 둔다. 이를 위해 2018년 이화여자대학교 연령통합고령사회연구소에서 수행된 '연령통합 및 세대통합 조사' 데이터를 활용하여 청년층의 연령주의 유형을 잠재프로파일분석(LPA)을 실시하였으며, 기술통계 및 교차분석 등을 통해 유형별 인구사회학적 특성을 파악하였다. 마지막으로 연령주의 유형이 세대간 갈등 및 노인복지정책에 인식에 미치는 영향을 파악하기 위해 회귀분석을 실시하였다. 연구결과, 청년층의 연령주의 유형은 '노화인식 양가감정·적극적 노인차별형', '노화불안 중수준·소극적 노인차별형', '노화불안 저수준·탈 노인차별형'이 도출되었다. 연령주의 유형은 세대갈등 인식 및 노인복지정책 인식에 있어 공통적 영향요인이었으며, 사회적 지지는 노인복지정책 인식 영향요인으로 확인되었다. 이를 바탕으로 사회 통합 구현을 위해 노화인식에 대한 교육 활성화 및 세대간 통합을 위한 교류 확대, 세대간 상생을 위한 사회분위기 쇄신 등에 대한 정책적 제언을 실시하였다.

• Annals of Occupational and Environmental Medicine
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• 제34권
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• pp.4.1-4.11
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• 2022

Background: Long working hours are known to account for approximately one-third of the total expected work-related diseases, and much interest and research on long working hours have recently been conducted. Additionally, as the prevalence of prediabetes and the high-risk group for diabetes are increasing worldwide, interest in prediabetes is also rising. However, few studies have addressed the development of type 2 diabetes and long working hours in prediabetes. Therefore, the aim of this longitudinal study was to evaluate the relationship between long working hours and the development of diabetes in prediabetes. Methods: We included 14,258 prediabetes participants with hemoglobinA1c (HbA1c) level of 5.7 to 6.4 in the Kangbuk Samsung Cohort Study. According to a self-reported questionnaire, we evaluated weekly working hours, which were categorized into 35-40, 41-52, and > 52 hours. Development of diabetes was defined as an HbA1c level ≥ 6.5%. Hazard ratios (HRs) and 95% confidence intervals (CIs) for the development of diabetes were estimated using Cox proportional hazards analyses with weekly working 35-40 hours as the reference. Results: During a median follow-up of 3.0 years, 776 participants developed diabetes (incidence density, 1.66 per 100 person-years). Multivariable-adjusted HRs of development of diabetes for weekly working > 52 hours compared with working 35-40 hours were 2.00 (95% CI: 1.50-2.67). In subgroup analyses by age (< 40 years old, ≥ 40 years old), sex (men, women), and household income (< 6 million KRW, ≥ 6 million KRW), consistent and significant positive associations were observed in all groups. Conclusions: In our large-scale longitudinal study, long working hours increases the risk of developing diabetes in prediabetes patients.