The Effects Of Structured Methods On Object Orientation : A Knowledge Interference Prospective

김인재,정덕훈,Kim, In-Jai,Jeong, Duke-Hoon Korea Information Processing Society 2002 정보처리학회논문지D Vol.9 No.5

새로운 정보기술의 생명주기는 점점 작아지고 그 기술이 점차 복잡해짐에 따라 그 기술을 이해하기가 어려워진다. 본 연구의 목적은 객체 지향 기술의 채택에 관한 이해를 돕기 위하여 객체지향 기술이 전통적인 소프트웨어 프로세스 기술과는 다른 패러다임의 기술이기 때문에 프로세스 중심의 구조지향 기술로부터 영향을 받을 것으로 판단된다. 본 연구는 구조지향 방법이 객체지향 방법론에 미치는 지식간섭 현상을 일종의 2$\times$2 팩토리얼 유사 실험계획법을 사용하여 실증적으로 분석하였다. 구조지향 방법론과 객체지향 방법론을 사용한 기간을 2개의 독려변수로 선택하였고 객체지향 방법론에 대한 사용 편의성을 1개의 독립변수로 설정하였다 자료는 현재 활동중인 구조지향 및 객체지향 방법론에 모두 경험이 있는 자료처리와 관리협회(DPMA : Data Processing and Management Association) 회원으로부터 수집하였다 최종 결과는 구조지향 방법론의 경험이 객체지향 방법론의 사용편의성에 부의 영향을 주는 것으로 나타났다. 향후 연구과제로 문화가 다른 국가에서 유사한 연구 수행한 후에 그 결과를 비교하는 것도 의미가 있을 것이다. The life cycle of new information technologies is getting shorter, and the technologies are becoming more complex and difficult to understand. The need to better understand adoption of object orientation motivates this paper. Adoption of object orientation should certainly be influenced by prior software process technologies, such as the process-oriented structured methods, because object orientation is considered to be a paradigm shift from conventional software process technologies. This study aims to empirically analyze knowledge interference of the structured methods with object orientation. A two factorial quasi-experimental design is set forth. The period of experience using the structured methods and the period of experience using object orientation are selected as two independent variables, and the perceived ease of use is chosen as one dependent variable. Data are gathered from active members of Data Processing Management Association (DPMA), who have experiences in using both the structured methods and object orientation. The final results empirically show that previous experience using the structured methods negatively influences the perception of using object orientation that is one of critical factors to technology adoption. It is suggested here that a future study dealing with the same research topic in other countries will provide new insights about comparative studies.

비만증에서 Pyridostigmine , Acipimox 투여에 따른 성장호르몬 방출호르몬 자극에 의한 성장호르몬의 분비반응

남수연(Su Youn Nam),이은직(Eun Jig Lee),남문석(Moon Suk Nam),조재화(Jae Hwa Cho),김인재(In Jai Kim),김정환(Jung Hwan Kim),김경래(Kyung Rae Kim),임승길(Sung Kil Lim),이현철(Hyun Chul Lee),허갑범(Kap Bum Huh) 대한내과학회 1996 대한내과학회지 Vol.50 No.3

Objectives: Obesity is associated with an impairment of normal GH secretion and blunted responses to all stimuli. Recent reports suggests that increased somatostatinergic activity is the basis for the GH derangement of obesity. However, the basic mechanism of this alteration is till being debated, The high plasma free fatty acid(FFA) is frequently observed in obesity. FFA participates in the regulation of pituitary GH secretion. To determine whether the derangement of GH secretion in obesity is associated with a high plasma FFa levels. Methods: Several tests with GH-releasing hormone(GHRH) with or without pyridostigmine (PYR) and acipimox(ACX), antilipolytic agents able to decrease FFA, were undertaken in both six obese and seven normal control subjects. Results: 1) In obese subjects, the GH response(mean peak±SEM:8.0±1.1 μg/L) to GHRH-(1-29)(1 μg/kg, iv) was significantly blunted when compared to normal controls(25.7±1.8 μg/L; p<0.05). 2) After PYR(120 mg), the response to GHRH only, but remained significantly reduce compared to controls treated with PYR plus GHRH 943.2±6.0 μg/L; p<0.05). 3) Basal FFA levels were higher than those of normal controls(p<0.05), ACX(500 mg) decreased FFA levels in both obese and normal subjects; the lowest FFA levels at 0.15 min were similar to those of normal cantrols, ACX also potentiated GHRH stimulated GH response in both obese and normal subjects. The GH responses potentiated by ACX in obesity(22.7±5.5 μg/L) were similar with those of PYR plus GHRHub ibese sybhects and GHRH in normal controls, but lower than control treated with ACX plus GHRH in normal controls, but lower than control treated with ACX plus GHBH(50.8±6.7 μg/L; p<0.05). 4) After the conbined pretreatment with ACX and PYR, GH responses in obesity(44.1±6.0 μg/LO were significantly higher than those to GHRH test, PYR plus GHRH, and ACX plus GHRH in normal controls. However their enhanced GH responses reduced compared to the control with ACX plus PYR plus GHRH(64.9±4.5 μg/L p<0.05). Conclusion: Our results are in agreement with hypothalamic hypothesis; an increase in somatostatinergic tone is responsible for the blunted GH response to GHRH in obesity. In addition, the demonstation that the decreased FFa levels induced by ACX potentiate the somatotrope responsiveness, likely acting at pituitary level, suggests that high plasma FFA levels play an important role in GH responsiveness in obesity, although other factors might also be involved in GH derangements.

연하 곤란을 호소한 특발성 인두 운동이상증

김인재(In Jai Kim),박효진(Hyo Jin Park),정준근(Jun Keun Jung),정준표(Jun Pyo Chung),전재윤(Chae Yoon Chon),박인서(In Suh Park) 대한소화기학회 1998 대한소화기학회지 Vol.30 No.2

Oropharyngeal dysphagia is characterized by difficulty in transfer of food frorn the mouth through the upper esophageal sphincter into the upper esophagus. Idiopathic pharyngeal <iyskinesia, such as pharyngeal paresis is a rare moiility disorder in oropharyngeal dysphagia. The most comrnon abnormality of pharynx is decreased amplitude of pharyngeal contraction, which result in misdirection of bolus into the nasal, oral, or laryngeal cavity, and finally lead to aspiration pneumonia. Treatment consists of maneuver to reduce pharyngeal stasis and enhance airway protection under the direction of a trained swallow therapist, We experienced a case of idiopathic pharyngeal dyskinesia of 75 years old male who was treated with physiologic technique. (Korean J Gastroenterol 1997; 30:257-261)

한국 조직블로그의 유형과 특성에 관한 탐색적 연구

김인재(Kim, In-Jai),양지선(Yang, Ji-Seon) 대한경영학회 2008 大韓經營學會誌 Vol.21 No.4

개인미디어의 충성도에 영향을 미치는 요인

섭언정 ( Nie Yan-ting ),김인재 ( Kim In-jai ) 한국정보시스템학회 2018 情報시스템硏究 Vol.27 No.3

Purpose As web 2.0 has taken root in the Internet environment, people began to create specific values to produce and disseminate contents on their own. In order to emphasize the personalized media attributes, the concept of self media was derived. In this paradigm shift, self media has emerged that succeeded in commercializing themselves in social media. Taking advantage of the influence of self media will have a tremendous positive impact on management activities such as marketing strategy, brand promotion, customer retention, and profit growth. This study examines the factors affecting the loyalty of self media in Korea and China because the studies in the area of selfmedia is not enough. Design/methodology/approach This study analyzed what factors influenced the loyalty of self-media in terms of Korea-China comparison. The research model was proposed on the basis of previous research papers. Content value, interactivity, ease of access, self-congruity, sympathy, and reputation were used as independent variables. Trust and satisfaction are used as mediating variables, nationality as moderator variables, and loyalty to self-media as a dependent variable. Results As a result, it was found that all independent variables directly influence the loyalty of self-media except interactivity, and interactivity indirectly influence loyalty through trust and satisfaction. There was a moderating effect of nationality between satisfaction and loyalty, but was not a moderating effect between trust and loyalty.

필드검사를 이용한 무도선수들의 무산소성 파워 예측의 교차타당도 검증

김의영 ( Eui Young Kim ),이성진 ( Sung Jin Lee ),이종환 ( Jong Hwan Lee ),김인재 ( In Jai Kim ) 대한무도학회 2010 대한무도학회지 Vol.12 No.1

본 연구는 무도종목 선수들에게 필요한 무산소성 파워를 예측하기 위하여 필드검사를 이용하여 무산소성 파워를 예측을 위한 회귀식을 개발하고 교차타당성도를 검증하여 무도선수들의 경기력 향상을 위한 기초자료를 제공하는데 목적이 있다. 연구의 대상자는 H대와 Y대에 소속된 태권도, 합기도 전공자들로 20대 초반의 남자70명을 대상으로 하였다. 대상자 중 40명은 추정식 개발을 위한 집단, 나머지 30명은 개발된 추정식의 타당도를 검증하기 위한 집단으로 각각 분류하였다. 본 연구의 자료처리는 SPSS 12.0 Program을 이용하여 모든 자료의 평균과 표준편차를 산출하였다. peak power와 mean power 예측을 위한 회귀식 개발을 위해 stepwise 방법을 활용하여 다중회귀분석 실시하였으며, 이때 독립변인으로 나이, 신장, 체중, 근육량, 체지방량, 체지방율, 제지방량, 수직점프, 제자리 넓이뛰기, 30m달리기, 50m달리기를 사용하였고, 종속변인으로 Peak Power 와 Mean Power를 사용하였다. 또한 개발된 회귀식의 타당성을 확인하기위해 Bland & Altman plot을 이용하여 차이값의 평균과 95%신뢰구간 내에서의 오차율을 검증하였다. 타당성을 검증하기 위하여 윈게이트 검사에 의한 결과와 추정식에 의한 결과의 차이를 알아 보기위해 paired t-test를 이용하였다. 이와 같은 과정을 거처 Ppeak(W) = -1027.210 +〔17.054×제지방량(kg)〕+〔20.191×수직점프높이(cm)〕, Pmean(W) = -46.499 +〔6.861×체중(kg)〕+〔5.145×수직점프높이(cm)〕의 회귀식을 개발하였으며, 타당도가 높은 것으로 나타났다. In order to estimate anaerobic power required for martial arts players, this study used field test to develop regression equation for such estimation of anaerobic power and verify the cross-validation of said equation, so that it could provide reference materials for better performance of martial arts players. To meet the above goals, total 70 young adult men in early 20`s were selected as subjects hereof from undergraduates who majored in the martial course of Taekwondo and Hapkido in H University and Y University. Out of them, 40 subjects were classified into a group for developing equation of estimation, while other 30 subjects were classified into another group for verifying the cross-validation of said equation. In this study, all data were processed using SPSS 12.0 program to calculate mean and standard deviation. In order to develop a regression equation to estimate peak power and mean power, this study adopted stepwise approach for multiple regression analysis, where it used different independent variables such as age, height, weight, muscle mass (MM), body fat mass (BFM), percent body fat (PBF), lean body mass (LBM), vertical jump height, standing broad jump width, and 30-meter and 50-meter running records, as well as dependent variables like peak power and mean power. In addition, this study used Bland & Altman plot to calculate the mean of difference and verify error rate within 95% confidence interval, so that it could verify cross-validation of developed regression equation. And this study also used paired t-test to determine possible differences between the results of Wingate test and those of estimation equation for cross-validation. As a result, this study could develop the following regression equation: Ppeak(W) = -1027.210 + 〔17.054 × LBM(kg)〕+〔20.191 × vertical jump height (cm)〕, Pmean(W) = -46.499 +〔6.861 × weight (kg)〕+〔5.145 × vertical jump height (cm)〕. It was found that said equation had high validity.

정상 심기능을 보이는 노인 환자에서 정형외과 수술 전 NT-proBNP의 역할

고은정 ( Eun Jung Ko ),문재연 ( Jae Youn Moon ),임영민 ( Yeong Min Lim ),홍원정 ( Won Jung Hong ),신석표 ( Suk Pyo Shin ),김상훈 ( Sang Hoon Kim ),양우인 ( Woo In Yang ),성정훈 ( Jung Hoon Sung ),김인재 ( In Jai Kim ),임상욱 ( San 대한내과학회 2014 대한내과학회지 Vol.87 No.3

Background/Aims: Preoperative N-terminal pro-brain natriuretic peptide (NT-proBNP) is a useful predictor of postoperative cardiovascular complications. The present study investigated whether blood NT-proBNP values are suitable for predicting postoperative cardiovascular complications after non-cardiac surgery in elderly patients showing normal left ventricular (LV) function on preoperative echocardiograms. Methods: This study was performed by analyzing the medical records of elderly patients referred to the cardiology department for the purpose of assessing their cardiac function before orthopedic surgery. Of the patients who underwent echocardiography and NT- proBNP assessment simultaneously, 275 patients aged ≥ 70 years and with an LV ejection fraction of ≥ 55% were included in the study. Results: Major adverse cardiac and cerebrovascular events (MACCEs) occurred in 33 (12%) of the 275 patients, and the NT-proBNP concentration was higher in patients with complications than in those without complications (1,904.20 ± 2,300.23 vs. 530.58 ± 882.27 pg/mL, p < 0.01). The ROC area under the curve was 0.756 (95% confidence interval 0.701-0.805, p < 0.001) with an optimal cutoff of 416.3 pg/mL (69.7% sensitivity, 67.36% specificity). A multivariate analysis showed that a preoperative age of > 80 years (odds ratio, 2.313; p = 0.047) and an increased blood NT-proBNP concentration (odds ratio, 3.189; p = 0.009) were independent risk factors for the prediction of MACCEs. Conclusions: Although elderly patients scheduled to undergo non-cardiac surgery may show normal LV systolic function on echocardiography, measurement of their preoperative blood NT-proBNP concentration is useful for predicting MACCEs occurring after non-cardiac surgery. (Korean J Med 2014;87:302-310)

조직성과에 미치는 SPI 영향요인에 관한 연구: 조직 성숙도의 조절효과 관점에서

김인재 ( In Jai Kim ),설경환 ( Kyung Hwan Seol ) 한국정보시스템학회 2010 情報시스템硏究 Vol.19 No.2

Software Process Improvement(SPI) has been a challenging issue to software organizations. The factors affecting SPI were analysed for improving software development processes. Numerous studies suggested influencing factors, and assessment models were utilized for software improvement. This research suggested that SPI factors affecting on an organizational performance may vary according to the CMM(Capability Maturity Model) level. The moderating effects of organizational maturity level between the SPI factors and the organizational performance were empirically tested. This research found that all six SPI factors except for the resistance to change affected the organizational performance. The moderating effects of management support, goal alliances, participation, and effect analyses were empirically supported. These results can provide several implications or a practical guidance to academic and industry professionals.

웹 기반 원격교육의 학업성취에 미치는 영향: 시스템 상호작용의 조절효과 관점에서

김인재 ( In Jai Kim ),박의준 ( Wee Joon Park ),고완영 ( Wan Young Go ),이연정 ( Yeon Jung Lee ) 한국정보시스템학회 2009 情報시스템硏究 Vol.18 No.2

IT 분야 학술지의 연구 생산성 및 심사 효율성 분석

김기환(Ki hwan Kim),김인재(In jai Kim) 한국IT서비스학회 2014 한국IT서비스학회지 Vol.13 No.4

Interests on collaborative research and academic relationship among researchers have been increased. Collaborative researchers can maximize productivity, time and cost savings, and reduce the risk of research. An empirical study on the research productivity of co-authors' network and review efficiency of the reviewer network was conducted based on co-author networks and reviewer networks in Korea Society of IT Service. This study aims to find the characteristics of the co-author and reviewer networks, and to analyze research productivity and review efficiency in order to draw some implications. The meaning of interactions among professional groups was analyzed. Research productivity index was calculated using 728 authors' papers submitted to the society. In order to verify the effects of indicators of social network analysis on research productivity and review efficiency, correlation and regression analyses were used. As a result, the indicators of network centrality did not affect the review efficiency, but affect the research productivity.