• 한국과학교육학회지
• /
• 제30권3호
• /
• pp.366-374
• /
• 2010

The purpose of this study was grouping students' perception types on the unexpected results in experiments, and looking into how the problem-solving experiment affected the change of these perception types. In order to answer this, interview data were analyzed in terms of perception types, and through analysis of questionnaires carried out at the beginning and the end of the semester, the change of perception types was researched. As a result, perception types of students divided into 'the difference between theory and practice,' 'inexperience of experiment skill,' and 'No reading between lines in manual.' After performing the problem-solving experiment for one semester, the perception of 'the difference between theory and practice' declined, and the desire for 'reading between lines' increased, so the problem-solving experiment influenced on the change of perception positively.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2005년도 ICCAS
• /
• pp.186-189
• /
• 2005

In a clinical setting, developing a reliable method for the automated drug infusion system would improve a drug therapy under the unexpected and acute changes of hemodynamics. The conventional proportional-integral-derivative (PID) controller might not be able to achieve maximum performance because of the unexpected change of the intra- and inter-patient variability. The fuzzy PID control and the conventional PID control were tested under the unexpected response of mean arterial blood pressure (MAP) to a vasopressor agent during acute hypotension. Compared with the conventional PID control, the fuzzy PID control performed the robust MAP regulation regardless of the unexpected MAP response (average absolute value of the error between target value and actual MAP: 0.98 vs. 2.93 mmHg in twice response of the expected MAP and 2.59 vs. 9.75 mmHg in three-times response of the expected MAP). The result was due to the adaptive change of the proportional gain in PID parameters.

• 경영과정보연구
• /
• 제31권4호
• /
• pp.593-609
• /
• 2012

본 연구는 우리나라 주식시장을 대상으로 2004년 1월 2일부터 2012년 8월 31일까지 일별자료를 이용하여 외국인투자자 거래행태의 대용치인 순매수강도의 비기대변동성이 KOSPI 일별종가수익률, 밤수익률 그리고 낮수익률의 변동성에 대해 정보이전효과가 존재하는 지에 대해 금융위기 전 후로 구분하여 분석하였다. 분석결과에 의하면 전체 분석기간 및 금융위기 전 후 하위기간 동안 전일(t-1) 및 당일(t) 외국인투자자 순매수강도의 비기대변동성이 KOSPI 일별종가수익률 변동성에 대해 각각 음(-)과 양(+)의 정보이전효과가 있는 것으로 나타났다. 여기서 음(-)의 정보이전효과는 전일 외국인투자자 순매수강도의 비기대변동성이 다음날 주식수익률의 변동성을 감소시키는 역할을 하고 있음을 의미하고 양(+)의 정보이전효과는 당일 외국인투자자 순매수강도의 비기대변동성이 당일 주식시장의 변동성 크기를 증가시킨다는 것을 의미한다. 한편, 전일 외국인투자자 순매수강도의 비기대변동성은 밤수익률의 변동성에 대해 정보이전 효과가 없는 것으로 나타났다. 마지막으로 낮수익률의 변동성에 대한 외국인투자자 비기대변동성의 정보이전 효과는 전체기간과 동일한 결과를 보였다.

• 한국직업건강간호학회지
• /
• 제19권2호
• /
• pp.140-149
• /
• 2010

Purpose: The purpose of this study was to explore the coping process of chief Executive Nurses(CENs) Who Had Experienced Unexpected Dismissal.The research question was "would you tell me about your experience of sudden dismissal?" Method: The methodology of collecting and analyzing data used in this study followed the ground theory of Strauss and Corbin (1998). Data were collected through in-depth interviews with open-ended questions about the subjects' coping experiences, which were audio-taped and transcribed. The survey was conducted between April and May, 2007. The subjects of this study were 5 CENs. Result: The results of the study are as follows. Core category of This Study was "Battling unsupported against the overwhelming reality." The participants had to face the most unexpected reality of being laid off. Their emotional/psychological response were betrayal, powerlessness, lonesomeness, sorrow, and hopelessness. They felt like a general who is facing overwhelming enemy in a war. The coping process was found to have four stages: shocked stage, resisting stage, negotiating stage and reflecting and transcending stage. Conclusion: The result of this study suggested that ceaseless exertion and cooperation at organizational and individual levels are needed to establish stable status and power of nursing departments and CENs in hospitals.

• 대한안전경영과학회지
• /
• 제10권4호
• /
• pp.83-91
• /
• 2008

In this study, actual status of safety management for the objects of 173 university, government research institution, and corporate affiliated research center was carried out through questionnaires. For unexpected accident status according to kinds, scale, and types of laboratories, frequency analysis using cross analysis and multiple replies analysis was used. The result of this study is judged to be used for laboratory safety education prevention programs, laboratory environment improvement, investment or improvement of laboratories through the actual safety management status of laboratories such as vulnerable works for generation of unexpected sudden accidents according to kind, scale, and type of laboratories, period of occurrence, prevention education, necessity for preliminary test, and cause of laboratory accidents.

• Advances in concrete construction
• /
• 제16권2호
• /
• pp.79-89
• /
• 2023

The occurrence of unexpected horizontal offset in the instrument or target will result in accumulated horizontal deviation in segment alignment with traditional short-line match method. A geometry control method, the four-point method, is developed for precast segmental bridges to avoid the influences of unexpected horizontal offset. The concept of the four-point method is elucidated. Furthermore, the detailed instruments and instructions are introduced. Finally, the four-point method is validated through a practical engineering application. According to the survey data, after short-line match precast construction, the vertical deviations on both sides vary between -5 mm and 5 mm in almost all segments, and the horizontal deviations vary between -4 mm and 4 mm in all segments. Without on-site adjustment, the maximum vertical and horizontal closure gaps are 12.3 and 26.1 mm, respectively. The four-point method is suggested to alleviate the issues associated with relatively poor soil conditions in casting yard.

• 한국운동역학회지
• /
• 제21권2호
• /
• pp.189-196
• /
• 2011

The purpose of this study was to verify the difference in biomechanical variation and pattern of the lower limb between planned and unexpected termination, which is related to the prevention of fatal fall in the elderly. Therefore, selected twenty subjects for each group which composed of females(age: $73.5{\pm}4.63$ year, height: $153.2{\pm}6.46$ cm, body mass: $58.98{\pm}5.82$ kg) and women(age: $23.4{\pm}2.5$ year, height: $164.65{\pm}3.9$ cm, body mass: $58.47{\pm}5.53$ kg) in their twenties. As a result, lower limb's extension moment and power were increased significantly in statistics(p<.05). Also, knee joint power showed instant changes from concentric contraction to eccentric contraction and hip joint power from eccentric contraction to concentric contraction. During unexpected termination there were dramatical increase in eccentric contraction and power(p<.05). In both planned and unexpected termination, ankle joint moment were higher in young group, but the moment of the hip joint were higher in the elderly group(p<.05). In contrast to younger group, there were no changes in knee extension moment in elderly group(p<.05). but showed relatively higher hip joint extension moment and power(p<.05).

• Journal of Korean Neurosurgical Society
• /
• 제29권4호
• /
• pp.491-499
• /
• 2000

Objective : In the cerebral aneurysm surgery, the goal is complete circulatory exclusion of the aneurysm without compromise of normal vessels. In an operating room, an operator should confirm the completeness and precision of the surgical result, before closing the wound. Object of this study was to determine which cases require intraoperative angiography. Methods : We reported our experience with 48 intraoperative angiographic studies performed during the surgical treatment of cerebral aneurysm of these 48 cases. There were 5 giant(10.4%), 15 globular(1.5-2.5cm)(31.25%) and 28 saccular(58.3%) aneurysm. We recorded the incidence of unexpected findings, such as residual aneurysms, major vessel occlusions. Using Fischer's exact test, we assessed whether unexpected angiographic findings showed any correlation with aneurysm site, size and clinical findings. Results : In 5 cases(10.4%), we detected unexpected angiographic findings which resulted in clip adjustment. By means of clip adjustment, an operator could restore the flow of two major arterial occlusion(4.2%) and also obliterate three persistent filling aneurysms(6.3%). Globular aneurysm was the only factor to predict unexpected angiographic findings(p<0.05). The subgroup of globular and giant aneurysm has a high risk of occlusion of the parent artery and its branches and/or residual aneurysm. There were two minor complications related to this procedure. Conclusion : Intraoperative assessment makes it possible to recognize and correct the technical defect. Particularly in globular aneurysm, we were able to prevent both the chance for another operation and the risk of postoperative complications.

• 한국초등과학교육학회지:초등과학교육
• /
• 제23권1호
• /
• pp.74-84
• /
• 2004

The purpose of this study was to get an implication on teacher education program, by exploring the difficulties pre-service elementary teachers have with their science lessons. 37 pre-service teachers were requested to write an anecdote about their science lessons during their 4 week practicum. By analyzing these anecdotes, the difficulties were grouped into several categories by the researcher, and then reconfirmed by the pre-service teachers themselves. The result showed that there were far more difficulties with practical work (cases: 48), than with content knowledge teaching (cases: 17). Among practical work related difficulties, the most frequent cases were: 1) when they have unexpected result different from scientific theory (cases: 10), 2) when they teach process skill and usage of lab equipments (cases: 8), and 3) when they do not have enough preparation for practical work (cases: 7). Unlike the result of preceding research on secondary pre-service teachers, there was no affective aspect problems. These difficulties also can be divided into 'problems' and 'dilemmas'. Whereas 'problems' can be settled by removing obstacles, 'dilemmas', a conflict-filled situation, require choices between competing values or aims. The use of scientific language, the decision on the level and amount of knowledge they teach, and disposal of unexpected experiment results caused such dilemmas in science lessons. The research results imply practical work should be more strengthened in the elementary teacher education program. And both teacher educators and pre-service teachers need to understand that practical teaching is a complex enterprise accompanying some 'dilemmas'. The role of science teachers as managers of dilemmas could be considered.

• International Journal of Advanced Culture Technology
• /
• 제8권4호
• /
• pp.279-286
• /
• 2020

This study was a phenomenological qualitative research that analyzed the experiences of Korean students studying in Korea after the COVID-19 incident. Participants in this study consisted of 22 international students aged 20 to 40 attending the International Exchange Center at C University. The interview period was from September 10, 2020 to October 10, 2020. Giogi qualitative research method was used to analyze vivid experiences of international students. As a result of the analysis, 26 semantic units, 7 subcomponents were derived. The description of the general structure sentence of phenomenology was a description of the meaning of experience from the perspective of participants, and the context and structure descriptions were integrated. The results of this study showed that: The students who came to Korea to study were concerned about Korea in various ways, but they had to adjust to unexpected changes in education methods, anxious about the unexpected COVID-19 disaster. Participants chose to study in Korea based on existing information, so they felt anxiety, regret, fear, and frustration over sudden changes, but taking online classes helped them learn repeatedly and voluntarily became an experience that suited their learning speed. As commuting time has decreased, they were more opportunities to make money in Korea also. Based on the results of this study, the following is suggested: First, the government should establish systematic online infection prevention measures for international students who have poor Korean language skills in preparation for unexpected disasters. Second, non-face-to-face teaching methods should be prepared with the same weight in the face-to-face teaching methods that have been carried out so far in preparation for unexpected disasters.