문항반응이론을 적용한 영상평가의 양호도 검증

이태구(Tae Koo Lee),박인용(In Yong Park),이한주(Han J. Lee) 한국체육측정평가학회 2010 한국체육측정평가학회지 Vol.12 No.2

이 연구는 이한주와 이태구(2004)의 후속연구로 제7차 교육과정 체육교과에서 도입된 수행평가의 실제성을 잘 반영한 평가방법인 영상평가를 고전검사이론과 문항반응이론 3모수 로지스틱 모형을 적용하여 검사 양호도를 검증하는 것이 목적이다. 이 목적을 달성하기 위하여 10문항으로 구성된 영상평가를 중학교 2학년 학생 453명을 대상으로 시행하였으며, 피검자의 응답데이터를 이용하여 타당도, 신뢰도, 문항특성, 검사특성을 살펴보았다. 또한, 문항의 편파성을 살펴보기 위해 집단 간 차별적으로 기능하는 문항을 선별하였다. 그 결과, 공인타당도는 .48로 나타났고, 고전검사이론을 적용한 신뢰도 지수(Cronbach`α)는 0.543, 문항반응이론을 적용한 신뢰도 지수(marginal reliability)는 0.558로 나타났다. 고전검사이론을 통한 문항의 분석 결과 1, 3, 7, 8번 문항이 난이도 혹은 변별도 측면에서 양호하지 않은 문항으로 나타났고, 문항반응이론을 통항 문항의 분석 결과 1, 6, 7, 8번 문항이 난이도, 변별도, 혹은 추측도 측면에서 양호하지 않은 문항으로 나타났다. 또한 남녀별 문항특성곡선과 M-H방법을 이용하여 차별기능문항을 선별한 결과 2, 9번 문항이 남, 녀 집단에 따라 차별적으로 기능하는 문항으로 나타났다. 검사정보의 경우 피검자의 능력수준이 0에서-2사이에 가장 높은 값을 산출하는 것을 확인하였다. 이러한 결과를 통해, 이 연구에서는 영상평가의 양호도 정도와 문항의 특성, 영상평가의 양식효과, 검사정보, 차별기능문항에 대한 논의를 제공하고 있다. Lee and Lee (2004) developed a multimedia test program for basketball unit using audio, video, and text to evaluate the 8th graders` knowledge such as rules, regulations, and traditions. The preliminary test contained live video clips of 10 questions. Although Lee and Lee (2004) provided the content validity and test-retest reliability, specific information about the goodness of test has not been reported. Thus, the purpose of this study was to examine goodness of multimedia test program. Participants were eighth graders (N=453) in middle school. Students completed 10 item multimedia test. Using students` test scores, validity, reliability, item and test characteristics were examined. Also, differentially functioning item were explored to examine item bias. Three parameter logistic model in item in item response theory (IRT) as well as classic test theory (CTT) was used. Results showed that concurrent validity was 0.48, reliability coefficient 0.543, and IRT`s marginal reliability was 0.558. Test items were analyzed using the CTT as well as the IRT. The CTT identified as unsual items (i.e., item number 1, 3, 7, and 8) showing lack of discrimination power. The IRT identified item number 1, 6, 7 and 8 were not appropriate in terms of the discrimination power. Test characteristics curve in gender and Mantel-Haenszel method identified differentially functioning item (i.e., item number 2 and 9) indicating two items are in favor of male students. Test information indicated that examinees with ability level between 0 and 2 showed best score. Discussions were provided in terms of the degree of goodness and item characteristics, and discrimination power of multimedia test program.

증기터빈 1단 노즐의 조속현상이 터빈성능에 미치는 영향

윤인수,이태구,문승재,이재헌,Yoon, In-Soo,Lee, Tae-Gu,Moon, Seung-Jae,Lee, Jae-Heon 한국플랜트학회 2008 플랜트 저널 Vol.4 No.3

Power plant industry has been developed at high-capacity, high-technology, and innovation. Steam turbine became the most useful equipment that dominate more than 50% of all the world electricity production. And developed new materials of the turbine blade and extended length of the turbine last blade brought reform in steam turbine performance upgrade. In this paper, when do partial load driving in high-capacity steam turbine, optimum driving method found whether there is something. In operating steam turbine, there is a lot of loss from secondary wake and throttle of the 1st stage nozzle by the biggest leading factor that load fluctuation affects in high-pressure steam turbine performance. Effect of internal efficiency by 1 stage nozzle is the biggest here, but here fluid flow and flow analysis were not yet examined closely definitely. So, Analyzed design data and acceptance performance test result to applying subcritical pressure drum type 560 MW, supercritical-pressure once through type 500 MW, and 800 MW steam turbines actually. In conclusion, at partial load driving, partial arc admission(PAA) is more efficient than full arc admission(FAA) efficiency. This is judged by because increase being proportional with gross energy of stream that is pressure - available energy if pressure of stream that is flowed in to the turbine increases, available energy becomes maximum and turbine efficiency improves. Therefore, turbine performance is that preview that first stage performance fell if decline is serious in partial load because first stage performance changes according to load.

급성 심근경색증 발생 위험인자와 경색관련동맥의 협착정도와의 연관성

김영진(Young Jin Kim),이태일(Tae Il Lee),이재련(Jae Lyun Lee),조인호(In Ho Cho),신동구(Dong Gu Shin),김영조(Young Jo Kim),심봉섭(Bong Seop Sim),이현우(Hyun Woo Le) 대한내과학회 1995 대한내과학회지 Vol.49 No.5

N/A Objectives: The most common cause of myocardial infarction is atherosclerotic lesion of epicardial coronary artery. But coronary blood flow can also be dampered by the arterial emboli, spasm. and this may result in myocardial infarction. To investigate the risk factors of myocardial infarction with normal coronary artery, a study was conducted. Methods: This study was made on 122patients, admitted at Yeungnam University Hospital as their first attack for acute myocardial infarction, from August 1992 to May 1994. The patients undertook angiography with thrombolytic therapy at the earliest possible time. These patients were classified into four groups: group 1-patients with less than 25% stenosis of infarct related artery(IRA); group 2-between 25-50% stenosis of IRA; group 3-between 51-75% stenosis of IRA; group 4-between 76-99% stenosis of IRA. Results: Among 122patients with myocardial infarction, the mean age was 55.4years old and the ratio of male to female was 3.5:1. Group 1patients had a significantly lower mean age(44.6years) than group 3patients(55.8years) and group 4patients (59.1years). Of fifteen patients in group 1, 12 patients developed acute myocardial infarction under 50years of age. In frequency of risk factors of coronary heart disease, 84 of 122cases(68.9%) were smokers. The number of smokers was higher in group 1 (86.7%) than group 3 (58.6%) and group 4 (64%). The frequency of angina prior to myocardial infarction was lower in group 1 (7%) than group 3 (45%) and group 4 (46%). The frequency of multivessel disease was lower in group 1 (13%) than group 3 (31%) and group 4 (50%). There was no significant difference in the frequency of the hypertension, diabetes, dyslipidemia, and obesity among the groups. Conclusion: Acute myocardial infarction with near normal infarct related artery developed at young age compared with those with significant infarct related artery stenosis. The number of smokers was higher and the frequency of previous angina history was lower in the same group.

무선 ATM 망에서 페이징 트래픽 부하의 감소를 위한 동적 페이징 영역 관리 기법

이태로,이성원,한치근,유인태,Lee, Tae-Ro,Lee, Seong-Won,Han, Chi-Geun,Yu, In-Tae 한국정보처리학회 2000 정보처리논문지 Vol.7 No.s8

본 논문은 ATM-Forum의 WATM 기반 제3세대 무선 멀티미디어 망 환경에서 하나의 M.E.SW(Mobility Enabled ATM Switch)가 단순화된 많은 AP들을 관리하는 방안에 대하여 고려하였다. 또한 WATM 망 환경에서 가변 그룹 크기와 동적인 그룹 페이징 순서 방법을 사용하는 효율적인 페이징 방안을 제안하였다. 그리고 제안한 방안과 기존의 방안에 대해 성능을 평가 및 분석하였다. 여기서는 blanket-polling, sequential-polling 그리고 고정크기 그룹화 방안과 같은 대부분의 기존 방안들을 제안한 가변적이면서 동적인 그룹화 방안과 비교 분석하였다. 분석결과 offered-load가 낮은 환경에서는 단순한 blanket-polling paging 방안이 약간 더 우수한 성능을 보였다. 그러나 트래픽 밀도가 높아지면서 제안한 방안이 기존의 방안들 보다 더 우수한 성능을 보였다. 성능개선은 주로 가변적인 그룹 크기와 MS(Mobile Station)기반 동적인 페이징 순서 방안에 기인한다. 또한 제안한 방안은 MS에 대한 아주 간단한 이력정보와 최종적으로 통신한 AP 정보만이 필요하다. 따라서 이 방안은 효율적으로 구현하는 것이 가능하다.

무선 ATM 망에서 페이징 트래픽 부하의 감소를 위한 동적 페이징 영역 관리 기법

이태로(Tae Ro Lee),이성원(Sung Won Lee),한치근(Chi Geun Han),유인태(In Tae Ryoo) 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.8

In this paper, we consider ATM-Forum''s WATM(Wireless Asynchronous Transfer Mode) based third generation wireless multimedia network environments, where many simplified AP(Access Point)s are managed by one M.E.SW(Mobility Enabled ATM Switch). Also, we propose an efficient paging mechanism for WATM network environments using variable grouping size and dynamic group paging sequence method. Then, we evaluate and analyze the performance of the proposed and conventional methods. That is, most of conventional algorithms such as blanket-polling, sequential-polling, and fixed size grouping method are compared with the proposed variable and dynamic grouping method. Analysis results show that simple blanket-polling paging method shows slightly better performance at low overload environments. However, as the traffic density increases, the proposed method shows better performance than the conventional methods. Main reason of the performance improvements is due to the variable grouping size and MS(Mobile Station) based dynamic paging sequence mechanism. Moreover, the proposed method requires very simple history information about MS, and only last AP information is required. Thus, it is possible to implement efficiently in real world.

간호행정학회지 게재논문의 연구동향 분석(2013~2015년)

이태화(Lee, Tae Wha),박광옥(Park, Kwang-Ok),서문경애(Seomun, GyeongAe),김미영(Kim, Miyoung),황지인(Hwang, Jee-In),유소영(Yu, Soyoung),정석희(Jeong, Seok Hee),정민(Jung, Min),문미경(Moon, Mikyung) 한국간호행정학회 2017 간호행정학회지 Vol.23 No.1

Purpose: This study aimed to identify research trends in the Journal of Korean Academy of Nursing Administration from 2013 to 2015. Methods: For this study, 171 articles were analyzed. Research designs, participants, research settings, sampling, and data analyses methods were reviewed using established analysis criteria. Keyword centrality and clusters were generated by keyword network analysis. Results: Most of studies used quantitative methods (82.5%), and sampling mainly focused on nurses (68.8%). The most commonly used data analyses methods were t-test, ANOVA, correlation, and regression. The most central keywords were turnover and empowerment. Network analysis generated four network groups: 1) burnout; 2) turnover; 3) happiness; and 4) nursing professionalism. Conclusion: The results of this study identify current trends and interests in Korean nursing administration research. The findings from this study suggest that future studies include a variety of research methods and maintain appropriate research ethics.

트리거형 한류기의 고장전류제한 동작 전자계 분석

이태인(Tae-In Lee),김태경(Tae-Kyung Kim),상범수(Bum-Soo Sang),최상재(Sang-Jae Choi),임성훈(Sung-Hun Lim) 한국조명·전기설비학회 2019 한국조명·전기설비학회 학술대회논문집 Vol.2019 No.5

조직풍토가 조직몰입에 미치는 효과에 관한 실증연구

이태구(Lee, Tae-Koo),김인호(Kim, In-Ho) 한국인적자원관리학회 2009 인적자원관리연구 Vol.16 No.1

본 연구에서는 조직풍토는 직무 스트레스를 매개로 조직성과에 작용하며, 매개변수인 직무 스트레스는 LMX의 질에 의해 조절될 것이라는 관계를 설정하고 있다. 이의 검증을 위해 산업분류체계에 의거 5개 산업군(건설업, 통신업, 제조업, 금융업, 서비스업) 종사자 2,000명을 대상으로 2008년 5월10일부터 5월 30일까지 3주간에 걸쳐 설문조사를 시행하여 최종적으로 회수된 1,028부의 유효설문을 분석하였다. 분석결과 조직풍토에 대한 직무 스트레스의 매개효과는 모두 유의한 결과가 발생하였지만, 직무 스트레스가 조직몰입에 미치는 영향에 있어 LMX의 조절효과는 유의한 설명력 변화가 확인되지 않았다 그리고 마지막으로. 연구의 시사점과 향후 연구의 방향을 제시하였다. It has become a widely held premise that people provide organizations with an important source of sustainable competitive advantage since traditional sources related to markets, financial capital, and scale economies have been weakened by global market and other environmental changes. So considerable number of scholars and business persons have been constantly interested in human resource management and leadership. in a situation like this, companies need not only to emphasize organizational efficiency but also manage organizational climate for organizational effectiveness which member naturally reduce job stress in order to enhance organizational commitment. Consequently this study is intended to not only review mediating effect between organizational climate and job stress, but also provide the suggestion for the LMX effect between job stress and organizational commitment. The major findings of this study are summarized as follows. First, there are mediating effect in the relationship between job stress and organizational commitment. Se

Development of Renewable Energy Convergence System for Aquaculture Industry

Tae-Oh Lee(이태오),Sang-Min Kim(김상민),Mun-Kyung Jo(조문경),Su-In Lee(이수인),Myeong-Seop Lee(이명섭) 한국신재생에너지학회 2019 한국신재생에너지학회 학술대회논문집 Vol.2019 No.11

Microcystis aeruginosa 의 성장기별 응집특성

이태관(Tae Gwan Lee),정연인(Youn In Chung) 한국수처리학회 1999 한국수처리학회지 Vol.7 No.2

The effects of algae and its byproducts on the coagulation of water were investigated on the laboratory scale. Algae which causes of waterbloom has numerous negative effects not only water treatment but also on human health, so we have to remove the algae during water treatment. Therefore we examined the removal characteristics of Microcystis aeruginosa, bloom forming blue-green algae at each growth phase to find their effects on coagulation. Result showed turbidities at lag phase and death phase was lower than turbidities at log growth phase and stationary phase, after coagulation. The probable reason for the difference lies within the cellular activity and inactivity at various phases. This hypothesis will require additional study. Result for measurement of UV_(254), UV_(260) was similar with those of turbidities. The zeta potentials were between -15mV and +15mV after coagulation.