학문과 생활26:연세대 서정우 교수

서정우 북한연구소 1977 北韓 Vol.- No.64

자유경쟁시대에 있어서 신문경영의 과제

徐正宇 연세대학교 행정대학원 1994 延世行政論叢 Vol.1994 No.19

팽창재를 혼합한 시멘트 모르터의 물성

서정우 광주대학교 1998 産業技術硏究 Vol.10 No.-

팽창재는 콘크리트의 본질적 특성인 건조수축에 의한 균열을 줄일 목적으로 개발된 혼화재이다. 본 연구는 팽창재가 모르터의 유동성, 팽창성 및 압축강도에 미치는 영향을 검토한 것이다. 여기에서 검토대상으로는 팽창재 사용량, 몰드제거시의 재령을 선정하였다. 실험결과 모르터의 팽창성은 팽창재 사용량에 영향을 받는 것으로 나타났으나 이에 비해 압축강도에 주는 영향은 상대적으로 작은 것으로 나타났다. 한편, 7일이상의 거푸집 존치시간은 팽창재의 팽창성을 크게 저하시키는 경향을 보였다. Expansive additive was developed to reduce the cracking in concrete structures due to dry shrinkage. In this study, the effects of expansive additive addition on flowing property, characteristics of expansion and compressive strength of cement motar were investigated through laboratory test. The factors considered in tests were 1) content of expansive additive, 2) removing time of formwork. The summary of consideration about these test results are follows. 1) In the given temperature and humidity condition(standard curing condition), it was found that the length change of mortars were proportioned to additive content to age 14. Especially, the length of conventional mortar which did not contain any type of additives somewhat increased during this period. 2) The removing of formwork over 7 days after placing result in greatly reduced expansive characterristics of mortars. 3) Though succesive wet curing was performed, the length of mortars were reduced after age 14 whether the mortars cotained expansive additive. 4) The age-strength relationship of mortar which contain expansive additive was not different from that of conventional mortars. 5) The compressive strength of mortars were not influenced by content of expansive additive.

自由主義 言論과 共産主義 言論의 理論比較

徐正宇 관훈클럽 1979 관훈저널 Vol.- No.29

Fall prediction of the elderly with a logistic regression model based on instrumented timed up & go

서정우,김태호,이진수,김정길,최진승,탁계래 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.8

An attempt has been made to use an instrumented TUG (iTUG) that complements the limitations of the traditional “timed up and go” (TUG). However, the variables that represent the characteristics of a faller have been reported to be different among preceding studies with iTUG. Thus, the purpose of this study was to develop a fall prediction model based on three years follow-up study with iTUG. Total 69 subjects participated in this experiment: 26 fallers (4 male and 22 female) who fell within 12 months from the first year measurement date and those newly fallen within 12 months from the second and third year measurement day were added up, and 43 non-fallers (11 male and 32 female) who had no falls. ITUG was performed once a year (two experiments per year) for three consecutive years using IMU sensor system (APDM Inc.). Among 30 variables, the final fall prediction model with logistic regression analysis consisted of five variables such as the duration of the total and the sit-to-stand phase, peak velocity of trunk sagittal plane and range of motion of trunk horizontal plane during gait phase and peak turn velocity during the turnto-sit phase. Prediction accuracy using the receiver operation characteristic curve was 69.9 %. It is necessary to develop a more accurate fall prediction model by increasing the follow-up period and adding the numbers of the fallers. Further, it is important to identify meaningful variables by consecutive years rather than simple annual comparison.

조선 후기의 세제 개혁 방안에 관한 연구- 균역법의 시사점 분석을 중심으로

서정우 한국조세법학회 2022 조세논총 Vol.7 No.3

한국세제사를 연구하는 것이 한갓 골동품적인 취향이 되어서는 안된다. 세제의 현재와 미래에 대한 예리한 문제의식을 가지고「과거와 현재의 대화」를 시도할 필요가 있다. 과거세제의 조명 아래에서 비로소 현재세제의 문제점과 개선방안을 생생하게 발견될 수 있을 것이다. 또한 현재세제의 조명을 통하여 과거세제의 깊이와 폭을 이해할 수 있다. 조선왕조 건국초기의 군역은 사회적인 신분의 귀천없이 고급관료의 자제를 비롯하여 일반양민에 이르기까지 특별한 면역사유가 없는 한 16세 이상 60세까지 모든 징집연령에 달한 장정은 지방과 각 진에 분거하여 국방에 힘쓰도록 규정된 국민 개병제였다. 그러나 임진왜란을 전후하여 국민개병제는 사실상 폐기된 바와 다름없었으며, 군역은 지배층을 제외한 일반 평민의 양역으로만 충당하게 되었다. 당시 군포는 장정 1인에 대하여 1년에 포 2필을 징수하였고 이것은 당시 평균시가로 쌀 12두에 해당하는 것이었다. 그러나 장정 1인당 1년에 포 2필이라는 것은 생산성에 기반을 두지 않고, 아무런 생산의 매개없이 오직 장정 숫자에 따라 누증하여 부과되는 것이었으므로 일종의 인두세(人頭稅)와 다름없는 불합리성이 내포되어 있었다. 이와 같이 당시에도 조세부담은 지주층은 적게 부담하고 가난하고 힘없는 농민들은 상대적으로 많은 조세를 부담하는 조세부담의 불균형이 발생하였다. 그리하여 조선 왕조 후기의 세제 및 세정은 이러한 구조위에서 위기를 맞이하게 되었던 것이다. 본 연구는 조선후기 균역법의 도입배경과 양역의 폐단을 역사적 문헌과 선행연구를 중심으로 연구를 진행하고자 한다. Studying Korean detergent history should not become an antique taste. In fact, by attempting “a dialogue between the past and the present” with a keen awareness of the present and future of the tax system, the present tax system can only be found vividly under the light of the past tax system. can be found Military service in the early days of the Joseon dynasty, from the restraint of high-ranking bureaucrats to the general public, without any loss of social status, from 16 to 60 years of age unless there is a special reason for immunity, Jang Jeong-eun, who reached all conscription ages, divided into provinces and camps to serve in national defense. It was a national open-air system that was stipulated to work hard. However, before and after the Imjin War, the national open military system was practically abolished, and military service was filled only with the military service of ordinary people excluding the ruling class. At that time, Gunpo collected 2 Pills of Pill per year for one Jangjeong, which was equivalent to 12 heads of rice at the average market price at the time. However, since the fact that 2 pills per person per year was not based on productivity and was imposed only according to the number of books without any production mediation, there was an irrationality that was no different than a kind of head tax. there was. As such, there was an imbalance in the tax burden, with the landlords paying less and the poor and powerless peasants paying relatively more. Thus, taxation and washing in the late Joseon Dynasty faced a crisis based on this structure. This study intends to conduct a study on the background of the introduction of the Gyunyeok method in the late Joseon Dynasty and the negative effects of the gyeokgyeok method, focusing on historical literature and previous studies.

고객 구매 예측을 위한 FSM 기반 파생 변수 생성 방법

서정우,김성희,송민석,이호근,박영하 한국경영과학회 2019 한국경영과학회 학술대회논문집 Vol.2019 No.4

고객 구매 예측을 위한 FSM 기반 파생 변수 생성 방법

서정우,김성희,송민석,이호근,박영하 대한산업공학회 2019 대한산업공학회 춘계학술대회논문집 Vol.2019 No.4

중소기업의 정보화지원정책에 관한 연구

서정우,김은홍,안성만 한국경영과학회 2003 한국경영과학회 학술대회논문집 Vol.- No.2

SME's (Small and Medium-sized Enterprises) have limited resources to build information systems on their own. We suggest what government need to do to support SME's, which includes establishing a one-stop service center, outsourcing of public service, and triggering strategy. In order for the government support to be effective, it should serve SME's needs continuously and professionally.

응급의학과 전문의의 공감 능력과 삶의 질

서정우,박경혜,박하영,선경훈,박송이,김태훈,노혜린,조준호 대한응급의학회 2016 대한응급의학회지 Vol.27 No.2

Purpose: Empathy in medical practice is related to medical communication and clinical competence. In previous studies, low quality of life and other factors play an integral role in low empathy among physicians. We evaluated the relationships between empathy, quality of life, and other factors among Korean emergency physicians. Methods: The survey was conducted using email to emergency physicians. The respondents completed a questionnaire including demographic information, the Jefferson Scale of Empathy, and the Brief version of the World Health Organization Quality of Life assessment instrument. Correlation analyses were performed, along with sub-analyses according to gender. Results: A total of 180 questionnaires were analyzed. The median value of the empathy scale was 89.0, and quality of life 64.8. Empathy was positively correlated with quality of life, age, and work experience as a specialist in total samples and males. Only work experience as a specialist showed correlation with empathy in females. Quality of life showed no association with age, work experience, and work load. However, quality of life showed negative correlation with age and work experience in female physicians. Conclusion: The more experienced specialist emergency physicians are, and the better quality of life they have, the higher level of empathy scale they have. Therefore, good quality of life could lead to good empathy, and vice versa. Good quality of life and good empathy could lead to the better outcome in emergency care. However, because the female physicians show different patterns of empathy and quality of life, further study is needed.