복합개념상황에서 고등학생들의 문제해결력과 정신용량

최혁준 ( Hyuk Joon Choi ),박호진 ( Ho Jeen Park ),권재술 ( Jae Sool Kwon ) 한국과학교육학회 2004 한국과학교육학회지 Vol.24 No.5

In this study, we examined high school students` abilities for solving problems under single concept situations and complex concept situations and their mental capacities. Single concept situations are defined as the problems which can be solved with a scientific concept or principle and complex concept situations are the problems combined with more than 2 single concept situations. 152 11th-graders were participated in this study, who had taken natural science track. FIT 752 was used to measure their mental capacities. And an instrument, made up of six questions under three single concept situations and three complex concept situations, was used to assess students` problem solving abilities. As results, students` problem solving abilities were lower in complex concept situations than in single concept situations. There wasn`t significant difference in mental capacities between of students who succeeded in solving problems and ones who did not under both single and complex concept situations. Although students solved the problems of single concept situations, some of them failed in solving the problems of complex concept situations composed of single concept situations which they succeeded in solving. They belonged to relatively low mental capacity group, of which students who failed in solving problems of complex situations had lower metal capacities than ones who succeeded in solving them. According to these results, it could be concluded that mental capacity is one of main variables which have influence on problem solving of complex concept situations composed of solvable single concept situations.

다양한 재질의 인공수정체를 삽입한 인공수정체안에서 고위수차의 변화

권혁락,박혜련,구본술,김태임,Hyuk-Lak Kwon,Hye-Ryun Park,Bon-Sool Koo,Tae-Im Kim 대한안과학회 2005 대한안과학회지 Vol.46 No.6

Purpose: To compare high-order aberrations in the pseudophakia with different types of intraocular lenses (IOLs), as well as with normal phakic eyes. Methods: This single-center prospective study comprised 80 cataract patients who underwent cataract surgery and 20 phakic eyes. Twenty eyes received an AF-1? VA-60BB; 20 eyes, a Corneal? ACR6D SE; 20 eyes, a Sensar? AR40e; and 20 eyes, a ClariFlex?. One month after cataract surgery, the eye aberration was measured using a Hartmann-Shack type aberrometer. The same test was performed for 20 normal phakic eyes. The individual Zernike polynomials, the root mean square (RMS) values of the third and fourth order aberration, and the total RMS among the groups were compared. Results: The individual Zernike coefficient (Z3-1, Z33, Z4-4, Z40, Z44) showed a significant difference in the IOL-implanted groups compared with the normal phakic eyes. There were statistically significant differences in the RMS values of the third and fourth order aberration, and total among each group. Conclusions: There was a statistically significant increase in aberration in patients with high refractive index IOL and a statistically significant decrease in patients with silicone IOL, compared to the normal phakic eyes.

염소가스 노출 환자의 1년간 추적관찰

권혁술,손유동,안희철,안지윤,Kwon, Hyuk-Sool,Sohn, You-Dong,Ahn, Hee-Cheol,Ahn, Ji-Yun 대한임상독성학회 2008 대한임상독성학회지 Vol.6 No.2

Purpose: Chlorine gas is a common irritant that usually causes mild respiratory symptoms. One severe symptom, RADS (Reactive Airway Dysfunction Syndrome), is not well known to physicians. We analyzed the clinical features of chlorine gas exposure. Methods: We prospectively collected 25 cases of chlorine gas exposure near our emergency center on January 10th, 2007, and analyzed demographic data, event-to-ER interval, symptoms, and laboratory results based on medical records. Results: Only 2 patients out of 25 were admitted because of severe symptoms, the rest were discharged without complications. Sixty percent of them visited the ER within 12 h of exposure. The most common symptoms were chest discomfort (60%), headache (40%), nausea (40%), throat irritation (26%), and cough (32%). Two out of eight dyspnea cases showed abnormal pulmonary function, but only one case was diagnosed as RADS. Conclusion: Most symptoms after chlorine gas exposure can be treated conservatively. However, patients with chlorine exposure should be followed up long term for delayed complications.

중등도, 고도 근시에서 라섹과 에피라식의 단기간 임상성적

권혁락,김권일,구본술,박혜련,Hyuk-Lak Kwon,Kwon-Il Kim,Bon-Sool Koo,Hye-Ryun Park 대한안과학회 2005 대한안과학회지 Vol.46 No.10

Purpose: To compare the results of laser epithelial keratomileusis (LASEK) and epi-laser in situ keratomileusis (Epi-LASIK) for the treatment of moderate to high myopia. Methods: In this study, 50 patients with a manifest refraction of moderate to high myopia were assigned to two groups: 50 eyes of 25 patients treated with LASEK and 50 eyes of 25 patients treated with epi-LASIK. Uncorrected visual acuity (UCVA), manifest refraction, corneal haze, and postoperative pain were reviewed in LASEK and epi-LASIK treated eyes at 3 months after the operation. Results: At one week after surgery, UCVA was recovered more rapidly after epi-LASIK than LASEK (LASEK: 0.61±0.23, Epi-LASIK: 0.79±0.11, p<0.05), but UCVA at both 1 and 3 months showed no significant difference between the LASEK and epi-LASIK groups. However, epi-LASIK-treated eyes had lower postoperative pain scores and lower corneal haze scores (1 month; p=0.01) than those of LASEK-treated eyes. Conclusions: Epi-LASIK showed a more rapid visual recovery than LASEK at 1 week after surgery for the correction of myopia. Epi-LASIK-treated eyes also had less postoperative pain and an earlier reduction of postoperative corneal haze. These results suggest epi-LASIK could be a viable alternative procedure for the correction of moderate to high myopia.

정량적 현상제시와 정성적 현상제시에 의한 학생들의 인지갈등 정도

김지나(Ji Na Kim),최혁준(Hyuk Joon Choi),권재술(Jae Sool Kwon) 한국과학교육학회 2002 한국과학교육학회지 Vol.22 No.1

The purpose of this study is to understand middle school students` levels of cognitive conflict for the students provided quantitative demonstration and qualitative demonstration after the pre-test. 297 middle school students were selected from one school in Pusan. Action-reaction problem of mechanics and electric bulbs in parallel problem of electricity were used in the demonstration and the pre-test. Students` cognitive conflict levels were investigated using the developed items by Kwon(1999)et al. Wd compared cognitive conflict levels between quantitative demonstration group and qualitative demonstration group. In addition to, we compared cognitive conflict levels between students who changed their preconceptions and the students who adhered to their preconceptions. We investigated correlation between levels of faith with preconceptions and cognitive conflict levels. The study generated the following results. First, students who selected incorrect choice in pre-test showed the higher levels of cognitive conflict in quantitative demonstration group than qualitative demonstration group and students who selected correct choice in pre-lest showed higher levels of cognitive conflict in qualitative demonstration group than qualitative demonstration group. Second, students who changed their preconceptions were higher levels of cognitive conflict than students who adhered their preconceptions. Third, students who selected incorrect choice in pre-test showed positive correlation between levels of faith with preconceptions and levels of cognitive conflict, and students who selected incorrect choice in pre-test showed negative correlation between levels of faith with preconceptions and levels of cognitive conflict.

위장관염으로 오인된 콜히친 중독 1례

안지윤,손유동,권혁술,안희철,Ahn, Ji-Yun,Sohn, You-Dong,Kwon, Hyuk-Sool,Ahn, Hee-Chol 대한임상독성학회 2008 대한임상독성학회지 Vol.6 No.2

A 47-year-old woman ingested about 12 mg of colchicine with suicidal intent. Colchicine, a highly poisonous alkaloid, is a commonly used treatment for gout, Bechet's disease, and familial Mediterranean fever. Despite the knowledge of its side effects, the risk of a significant overdose is under-appreciated. She suffered from acute multisystem toxicity, including gastrointestinal disorders, bone marrow suppression, alopecia, and probable pancreatitis, but she ultimately recovered with supportive therapy. We report a case of acute colchicine toxicity from a single overdose with a review of the literature.

인지갈등 해소 지연이 중학생의 과학 개념변화에 미치는 효과

최한용 ( Han Yong Choi ),김지나 ( Ji Na Kim ),최혁준 ( Hyuk Joon Choi ),권재술 ( Jae Sool Kwon ) 한국과학교육학회 2004 한국과학교육학회지 Vol.24 No.2

The purpose of this study is to investigate the effect of the delayed resolution of cognitive conflict on middle school students` conceptual change in learning the concept of the action and reaction with cognitive conflict strategy. The subjects were divided into 3 groups according to the time in which teacher tried to resolve cognitive conflict: instant resolution group, 2-day delay resolution group, and 7-day delay resolution group. Pretest, just before test, posttest, and delayed posttest were examined to measure the degree of conceptual change. Delay resolution groups` students answered the questionnaire asking what they had done to resolve cognitive conflict during the period which had been delayed resolution of cognitive conflict. The results of this study were as follows. First, instant resolution group showed significantly more scientific conceptual change than delay resolution groups. Secondly, most of delay resolution groups` students who tried to resolve cognitive conflict interacted with their peers. Also, delayed resolution of cognitive conflict was not helpful to resolve cognitive conflict. Thirdly, in delay resolution groups, we found the tendency that students who spent more than 30 minutes trying to resolve cognitive conflict altered their preconceptions into scientific concepts more easily than the others did. According to the results of this study, instant resolution of cognitive conflict is more effective on scientific conceptual change than delayed resolution of cognitive conflict.

네일 건(Nail Gun) 사고에 의한 경부 관통상 1례

한종순 ( Jong Soon Han ),손유동 ( You Dong Sohn ),안지윤 ( Ji Yoon Ahn ),안희철 ( Hee Cheol Ahn ),권혁술 ( Hyuk Sool Kwon ),서강열 ( Gang Yeol Seo ),조광윤 ( Kwang Yun Cho ),박승민 ( Seung Min Park ) 대한외상학회 2011 大韓外傷學會誌 Vol.24 No.1

Powered by compressed air, a nail gun is an essential alternative tool to a hammer on any construction site. This useful machine launches nails at high speed, automatically embedding them in a piece of wood in only a fraction of a second. In spite of its convenience, life-threatening and fatal nail gun injuries can occur when a nail gun is misused, such as in a suicide attempt, or when the operator has insufficient training because combustion nail guns are capable of firing projectiles at velocities higher than 150 m per second. Although injuries by nail guns are rarely reported, there have been reports of nail gun injuries to the head and the trachea in Korea. In the emergency room, the authors experienced a patient injured by an accidental shooting of a nail gun while working in construction. In that accident, a nail penetrated the patient`s cervical vertebra through the left cheek. This report is aimed at studying medical treatment for patients with penetrating injuries caused by nail guns. (J Korean Soc Traumatol 2011;24:48-51)