하순에 발생한 소낭포성 부속기 암종(Microcystic Adnexal carcinoma)의 치험례

장현석(Chang Hyun Suk),정무혁(Chung Moo Hyeok),장명진(Jang Myung Jin),김용관(Kim Yong Kwan),윤영호(Yoon Young Ho),박영욱(Park Young Yook) 대한구강악안면외과학회 1995 대한구강악안면외과학회지 Vol.21 No.3

Microcystic adnexal carcinoma(MAC) is a relatively uncommon tumor which was first described by Goldstern et al. In 1982 as most commonly presenting facial plaque or nodule. This slow-growing tumor is highly invasive, locally aggressive and deeply infiltrating neoplasm that has recently been recognized as a distinct clincopathologic entity. Microcystic adnexal carcinoma(MAC) is characterized by follicular and sweat gland differentiation and a stroma of dense collagen. Histologically the tumor shows solid islands and strands of squamous cells and sparse small ductal structures, some of them containing central cores of dense eosinophilic keratin. All of them are embedded in a sclerotic stroma. Microcystic adnexal carcinoma is nondescriptive and may be mistaken microscopically for other benign and malignant entities. Microscopically the tumor shows both pilar and sweat gland differentiation and involves the entire dermis and subcutaneous tissue, and invading perineural spaces. The tumor cells involve neryes perineurally or intraneurally. And they frequently extend into underlying structures such as muscle, fat, and bone. Although local recurrences are common after standard surgical excision, metastases have not been reported. Extensive resection of lesions may be necessary to extirpate widespread tumor, particularly those that are long standing or recurrent. Since significantly increasd morbidity is associated with recurrent disease, surgical and histopathologic techniques that stress examination of all margins are indispensable. A 52-year-old male complaining recurrent ulcer formation of the lower lip during past 15 years came to Dept. of Oral and Maxillofacial Surgery, Kangnam General Hospital for the diagnosis of the lip lesion. The incisional biopsy result was the microcystic adnexal carcinoma of the lower lip. As a treatment method we performed V-shaped local wide resection of the lesion and direct closure. Wde followed up the patient for 17 months after surgery. The patient did not show recurrent sign. We report this rare case of microcystic adnexal carcinoma of the lower lip with the review of literatures.

Sfard의 구상화(Reification) 이론에 근거한 중·고등학생의 이차방정식 근의 공식 개념 형성 수준 분석

장현석 ( Chang Hyun Suk ),이봉주 ( Lee Bongju ) 한국수학교육학회 2018 수학교육 Vol.57 No.3

In this paper, we applied Sfard's reification theory to analyze the secondary students’ level of conceptualization with regard to the formula of quadratic equation. Through the generation and development of mathematical concepts from a historical perspective, Sfard classified the formulation process into three stages of interiorization, condensation, and reification, and proposed levels of formulation. Based on this theory, we constructed a test tool reflecting the reversibility of the nature of manipulation of Piaget’s theory as a criterion of content judgement in order to grasp students’ conceptualization level of the formula of quadratic equation. By applying this tool, we analyzed the conceptualization level of the formula of quadratic equation of the 9^th and 10^th graders. The main results are as follows. First, approximately 45% of 9^th graders can not memorize the formula of quadratic equation, or even if they memorize, they do not have the ability of accurate calculation to apply for it. Second, high school curriculum requires for students to use the formula of the quadratic equation, but about 60% of 10^th graders have not reached at the level of reification that they can use the formula of quadratic equation. Third, as a result of imaginarily correcting the error of the previous concept, there was a change in the levels of 9^th graders, and there was no change in 10^th graders.

중학생의 일차함수 개념 형성 과정 담화 분석

장현석(Chang, Hyun Suk),김명창(Kim, Myung Chang),이봉주(Lee, Bongju) 학습자중심교과교육학회 2019 학습자중심교과교육연구 Vol.19 No.14

이 연구에서는 일차함수 수업에서 Sfard의 담화 이론을 적용하여 중학생의 일차함수 개념 형성 과정을 분석하였다. 담화의 심층 분석을 위해 신-피아제 모델을 반영하여 언어 분석 틀을 구성하고 적용하였다. 일차함수 개념 형성 과정의 담화를 분석하기 위하여 일차함수를 학습하지 않은 중학교 2학년 학생 4명을 대상으로 진행하였다. 수업은 2018년 7월 3주 동안 총 6차시에 걸쳐 이루어졌고, 수업 전 과정을 녹화하고 전사하였다. 또한 마지막 수업 직후 수업에서 다룬 일차함수에 대한 지필평가 및 면담을 실시하여 그 결과와 담화에서 나타난 개념 이해 정도를 비교하였다. 분석 결과, 일차함수에 대한 설명식 수업과 발표 수업 과정에서 나타나는 학생의 다양한 담화 양상을 관찰할 수 있었다. 학생은 담화 과정에서 시각적 조정자(예: 그래프, 좌표)를 활용하여 내러티브를 확장하거나 교정하고, 객관화된 사회적 지식의 획득과 루틴의 교정을 통해 일차함수 개념을 획득하고 있는 것으로 드러났다. 또한, 교사의 설명식 수업에서도 기존 지식과 새로 배우는 지식 사이의 연결을 위한 학생의 조절 사태가 다수 발생하였고, 발표 수업에서도 학생의 루틴과 내러티브의 교정을 위한 조절 사태가 발견되었다. The study applied Sfard s discourse theory to analyse the student s concept formation process of a linear function. For in-depth analysis of discourse, the language analysis framework was constructed by reflecting the neo-Piagetian model of Ruthford and applied for middle school students linear function classes. A total 6 classes were held over three weeks in July, 2018. We recorded the linear function classes for 4 8 th graders who didn’t learn and transferred it. In addition, we performed the paper test and the interview after all classes and compared its results with the level of concept understanding in the discourse. As a result, various discourse patterns of the students were observed in the course of the linear function explanatory class and presentation class. Students were found to be using visual mediators (e. g. graphs, coordinates) to expand or correct narratives, and to acquire the concept of linear function through the acquisition of objective social knowledge and the modification of routines. In the explanatory instruction, there were a lot of student’ accommodation states which link between existing knowledge and new knowledge. And accommodation states for corrections of the students’ routine and narratives were founded in the presentation classes

중⋅고등학생의 평행사변형과 마름모의 유사성과 차이에 대한 인식 분석

장현석(Hyun Suk Chang),김명창(Myung Chang Kim) 한국학교수학회 2024 韓國學校數學會論文集 Vol.27 No.1

이 연구에서는 중⋅고등학생의 평행사변형과 마름모의 유사성과 차이에 대한 인식을 분석하였다. 이를 위해 검사 도구를 개발하고 중⋅고등학생 총 191명을 대상으로 검사하고, 일부의 학생을 면담하였다. 연구 결과는 다음과 같다. 유사점과 차이점에서 공통으로 평행사변형과 마름모의 종류에 대한 응답 비율이 가장 높았고, 길이와 같은 양적인 응답 비율이 가장 낮았다. 유사점의 경우 첫째, 평행사변형과 마름모의 정의, 변과 각 그리고 대각선의 내림차순으로 응답 비율이 높았다. 둘째, 변환 관점의 응답 비율은 다른 범주와 비교해서 상대적으로 가장 낮았다. 셋째, 대체로 여학생은 도형의 형태에 기반 한 양적인 정보를 토대로 응답하고 남학생은 평행사변형과 마름모의 정의에 기반 해서 응답하였다. 넷째, 조작의 경우 빈도와 비율에서 남학생과 여학생의 차이는 없었지만 학년이 올라감에 따라 증가하였다. 차이점의 경우는 전체적인 길이에 대한 응답에 비해 대각선의 길이에 대한 응답 비율이 높았다. 그러나 대각선을 평행사변형과 마름모의 성질과 관련 지은 응답은 없었다. 마지막으로 개념 정의와 개념 이미지의 관점에서 중⋅고등학생은 평행사변형과 마름모의 개념 정의에 대한 기억 또는 이름을 이용하거나 개념 이미지 및 각 등을 부분적으로 주목하고 이를 시각적으로 변환하거나 넓이와 같은 양적인 정보를 이용하여 평행사변형과 마름모의 유사성과 차이에 대해 응답하였다. In this study, the perception of the resemblance and difference between the parallelogram and rhombus of middle and high school students was analyzed. To this end, a test tool was developed, a total of 191 middle and high school students were tested, and some students were interviewed. The results of the study are as follows. In common with resemblances and differences, the response rate to the type of parallelogram and rhombus was the highest, and the quantitative response rate such as length was the lowest. In the case of resemblances, first, the response rate was high in the order of the definition of parallelogram and rhombus, the edge and angle, and the lower value of the diagonal. Second, the response rate from the perspective of transformation was relatively lowest. Third, in general, female students responded based on quantitative information based on the shape of the figure, and male students responded based on the definition of parallelogram and rhombus. Fourth, in the case of manipulation, there was no difference between male and female students in frequency and ratio, but it increased as the grade went up. In the case of differences, the response rate to the length of the diagonal was higher than that of the overall length. However, there was no response to diagonals relating to the properties of parallelogram and rhombus.

광경화성 아크릴 수지의 경화특성에 관한 연구

김성현(Sung Hyun Kim),장현석(Hyun Suk Chang),박선희(Sun Hee Park),송기국(Ki Gook Song) 한국고분자학회 2010 폴리머 Vol.34 No.5

광경화성 수지인 아크릴레이트의 경화 특성과 메카니즘에 대하여 Photo-DSC와 FTIR, Raman spectrometer를 이용하여 조사하였다. 아크릴레이트 종류, 관능기 수, 광 세기 등에 따른 경화 속도에 관한 정보는 시간에 따른 Photo-DSC curve에서 계산하였고, FTIR과 Raman을 이용하여 경화 반응의 전환율과 반응 메카니즘을 조사하였다. 광경화 반응에서 산소의 영향을 알아보기 위하여 아크릴레으트 수지와 thiol-ene 수지의 경화과정을 비교하였는데, 공기 중 산소가 아크릴레이트의 라디칼 반응에서 금지제로 작용하여 아크릴레이트 수치는 80% 이하의 전환율을 보인 반면 thiol-ene 수지는 산소가 반응에 영향을 미치지 않는 것을 알 수 있었다. The curing mechanism and characteristics of UV curable acrylate resins were studied using Photo-DSC, FTIR, and Raman spectroscopy, Effects of chemical structures of acrylate, numbers of functional group, and UV intensity on curing kinetics were investigated with Photo-DSC. FTIR and Raman spectroscopy has been used to understand curing mechanisms and reaction conversion. In order to investigate the effect of oxygen on the photo-curing reaction, the curing process was compared between the acrylate and thiol-ene resins. The reaction conversion was found to be less than 80% for acrylate resins. The photo-curing reaction of the acrylate resin could not proceed to the end because of oxygen which acts as a reaction inhibitor while the thiol-ene resin was hardly affected from oxygen during the curing process.

능동적 가상머신 통합 모형을 위한 평가척도 설계

윤호영(Ho Yeong Yun),장현석(Hyun Suk Jang),이창훈(Chang Hoon Lee) 한국정보과학회 2021 한국정보과학회 학술발표논문집 Vol.2021 No.12

함수의 연속을 판단하는 문제에서 현직교사와 예비교사의 정의역 인식 조사

이세형 ( Lee Se Hyung ),장현석 ( Chang Hyun Suk ),이동원 ( Lee Dong Won ) 한국수학교육학회 2018 수학교육 Vol.57 No.4

In this paper we study in-service teachers’ and pre-service teachers’ recognition the domain in the problem concerning the continuity of a function. By a questionnaire survey we find out that most of in-service teachers and pre-service teachers are understanding the continuity of a function as explained in high school mathematics textbook, in which the continuity was defined by and focused on comparing the limit with the value of the function. We also notice that this kind of definition for the continuity of a function makes them trouble to figure out whether a function is continuous at an isolated point, and to determine that a given function is continuous on a region by not considering its domain explicitly. Based on these results we made several suggestions to improve for in-service teachers and pre-service teachers to understand the continuity of a function more exactly, including an introduction of a more formal words usage such as ‘continuous on a region’ in high school classroom.

해면 정맥동 혈전증(Cavernous Sinus Thrombosis) 치험례

김경원,김용관,장명진,장현석 大韓顎顔面成形再建外科學會 1995 Maxillofacial Plastic Reconstructive Surgery Vol.17 No.4

Cavernous sinus thrombosis is one of the major complications of abscesses of the maxillofacial region. The initial symptoms of CST are usually pain in the eye and tenderness to pressure. this is associated with high fluctuating fever, chills, rapid pulse, and sweating. Venous obstruction subsequently causes edema of the eyelids, lacrimation, proptosis, chemosis and retinal hemorrhages. Blindness is sometimes an accompaniment of cavernous sinus thrombosis when the infection also involves the orbit. There is also cranial nerve involvement (oculomotor, troclear, abducence) and ophthalmoplegia, diminished or absent corneal reflex, ptosis, and dilation of the pupil occur. The terminal stages bring signs of advanced toxemia and meningitis. Infections of the face can cause a septic thrombosis of the cavernous sinus. Furunculosis and infected hair follicles in the nose are frequent causes. Extractions of maxillary anterior teeth in the presence of acute infection and especially curettage of the sockets under such circumstances can cause this condition. The infection is usually staphylococcal. The inflection may spread directly through the pterygoid plexus of veins and the pterygomaxillary space and then ascend into the sinus or it may spread directly from the pterygopalatine space to the orbit. This is possible because of the absence of valves in the angular, facial, and ophthalmic veins. The treatment is empirical antibiotic therapy followed by specific anbibiotic therapy based on blood or pus culture. The inflection usually involves one side, however, it may easily spread to the opposite side through the circulus sinus. Unless it is treated early, the prognosis is poor even in this doses. Occasionally the antibiotics will not adequately resolve the septic thrombus, and death ensues. the use of anticogulants to prevent venous thrombosis has been recommended, but the efficacy of such therapy has not been substantiated. Surgical access through eye enucleation has been suggested. We report a case which demonstrates cavernous sinus thrombosis by the infection after the functional neck dissection and the intraoral reconstruction with auriculomastoid fascio-cutaneous island flap.