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      • 방사선을 이용하여 제조한 poly(vinyl alcohol)/poly(acrylic acid) 하이드로젤의 제조 및 특성

        박종석,김현아,최종배,권희정,임윤묵,노영창 한국방사선산업학회 2011 방사선산업학회지 Vol.5 No.4

        Poly(vinyl alcohol) (PVA) is an interesting material with good biocompatibility, highelasticity and hydrophilic chacrateristics. In this study, crosslinked hydrogels based on PVA, andpoly(acrylic acid) (PAAc) were prepared by gamma-ray irradiation. PVA and PAAc powders weredissolved in deionized water, and then irradiated by a gamma-ray with a radiation dose of 50 kGyto make hydrogels. The hydrogels were then annealed in an oven at 120 C for 10 min, 30 min and50 min under nitrogen atmosphere. The properties of a hydrogel such as gel fraction, swellingbehavior, thermogravimetric analysis (TGA) and adhesive strength as a function of PAAc contentand annealing time were investigated. The gel fraction decreases with decreasing PAAc contentand increasing annealing time. The thermal behaviors have shown different patterns according tothe annealing time. The adhesive strength increases with increasing PAAc content.

      • KCI등재
      • KCI등재
      • KCI등재

        Biodegradable polycaprolactone/cuttlebone scaffold composite using salt leaching process

        박종석,Youn-Mook Lim,Min-Ho Youn,Hui-Jeong Gwon,Young-Chang Nho 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.7

        We prepared biodegradable polycaprolactone/cuttlebone scaffold composite by salt leaching process. In the first step, a co-continuous blend of biodegradable materials, polycaprolactone (PCL) and cuttlebone (CB), and an amount of sodium chloride salt particles were mixed using a stirrer. Next, the extraction of mineral salts using de-ionized distilled water was performed using a biodegradable PCL/CB scaffold with fully interconnected pores. Finally, the durable morphology of the scaffolds was fabricated by freeze-drying process at −53 oC for 24 hrs in a vacuum. In addition,the quadrilateral pres ranged from about 250 to 300 μm in diameter. Scanning electron microscopy (SEM) and mercury intrusion porosimeter techniques were carried out to characterize the pore morphology. By increasing the CB and sodium chloride salt particle content, the number of interconnected pores, material properties, and pore morphology were dramatically changed. The average compressive strengths (load at 50% strain) of the different porous PCL/CB scaffolds were found to decrease from 133 to about 79 (load at 50% strain, gf) with an increase in porosity. The values of the porosity increased as the sodium chloride salt volume fraction increased

      • KCI등재

        Synthesis and Characterization of Manuka Honey Loaded Carboxymethyl Cellulose Hydrogel Prepared by Gamma-ray Irradiation

        박종석,정진오,권희정,정성인,노영창,임윤묵 (사)한국방사선산업학회 2019 방사선산업학회지 Vol.13 No.3

        Manuka honey differs from normal honey because of its additional existence of nonperoxideantibacterial activity which has been used to treat infections in a wide range of woundtypes. In this study, Manuka honey mixed with carboxymethyl cellulose (CMC) was crosslinkedand sterilized by using a γ-irradiation of 50 kGy from a 60Co source to make a new hydrogelwound dressing. The effects of various parameters such as honey concentration (0~20 wt%), gelcontent, and the absorption ratio in water were investigated in detail. The antibacterial propertieswere evaluated by paper diffusion test. The antibacterial tests indicated that the manuka/CMChydrogels have a good antibacterial activity against Escherichia coli (E. coli) and Staphylococcusaureus (S. aureus). As effective therapeutic evidence, the rate of vivo wound healing process in db/db mice was investigated based on real-time photographs and wound area contraction.

      • KCI등재

        조현병의 역사적 고찰

        박종석,강웅구 대한신경정신의학회 2015 신경정신의학 Vol.54 No.4

        Fundamental difficulties in psychiatric nosology lie in the most basic fact that it deals with subjective states of the human mind. Modern instrumental diagnostic classification systems, which amount to lists of symptom inventories, could not provide accurate concepts of psychiatric disorders. This is also true for schizophrenia, a representative mental disorder. Kraepelin’s dementia praecox was a collection of controversially proposed diseases, which had some critical similarities in their clinical features, i.e., the course and outcome. Despite initial debates on the adequacy of this concept, dementia praecox was recognized as a disease entity quite early, so that the concept of dementia praecox or schizophrenia proliferated, became diversified, and was then altered. We can now find large discrepancies between Kraepelin’s dementia praecox and today’s schizophrenia. However, the myth of disease entity was seldom challenged and psychiatrists today implicitly believe that they are dealing with what Kraepelin had proposed. In order to navigate this impasse, we thought that historical studies on the concept of dementia praecox and underlying taxonomic principles established by 19th century alienists including Kraepelin would shed some light. The aim of this article is to comprehensively review the history of concepts of dementia praecox or schizophrenia, and to question critically how much today’s schizophrenia has received the conceptual inheritance from original concepts. Through this process, we expect to attain a renewed understanding of schizophrenia.

      • KCI등재

        미국 Nature-Study 형성 과정과 과학교육에의 시사점

        박종석,박상민,Park, Jongseok,Park, Sangmin 대한화학회 2014 대한화학회지 Vol.58 No.1

        이 연구의 목적은 Nature-Study의 형성 과정을 역사적으로 고찰함으로써 오늘날 이루어지고 있는 과학교육의 방향과 의미를 재고하여 시사점을 찾는 것이다. Nature-Study의 사상은 실물 교육을 강조한 캄파넬라, 라트케, 코메니우스, 페스탈로치 등의 사상에 기초하고 쉘던의 사물학습, 아가시의 자연사, 파커의 진보주의에 의해 형성되었다. Nature-Study는 방법적 측면에서는 사물학습의 '실물 주제 중심의 학습', 내용적 측면에서는 자연사의 '자연에 대한 학습', 철학적 측면에서는 진보주의의 '학습자 중심의 학습'에 영향을 받아 발전해 나갔다. 아가시의 제자로 쉘던의 오스위고 사범학교와 파커의 쿡 카운티 사범학교에서 근무한 스트레이트는 이 세 영역을 종합화하여 Nature-Study 형성의 기틀을 마련하였다. 이어 쿡 카운티 사범학교의 잭만은 Nature-Study를 교과로서 확립시켰으며 코넬 대학의 베일리와 콤스톡은 미국 Nature-Study 협회를 구성하여 대중화에 공헌하였다. 그러나 교육자들이 점차 통합적인 Nature-Study를 거부하고 직접 경험보다 교과서를 중요하게 여기면서 1920년대 이후 Nature-Study가 쇠퇴하게 되었다. 과학교육에서 Nature-Study 정신은 통합과 실제적 학습을 강조하는 오늘날 과학교육에 있어 자연을 주제로 한 통합교육, 자기주도적 학습, 자연과의 교감, 학습자의 인격 형성에 큰 역할을 할 것으로 판단된다. This study purposes to historical approach the formation process of Nature-Study, and to re-evaluate its definition and direction at present. The idea of Nature-Study originated from Campanella, Ratke and Comenius, who emphasized real things. The idea developed through Object Lessons of Sheldon, the Natural History of Agassiz, and Progressivism of Parker. They acted as the main contributors who evolved the idea of Nature-Study and its core fields that involve: 'studying with real things' in Object Lessons which brought the methodical aspects to the idea, 'studying with nature' from Natural History that enhanced the content characteristics and 'learner-centered education' from Progressivism, which impacted the philosophical aspects. Straight (a fellow student of Agassiz) was a teacher for Sheldon Oswego normal school and Parker's Cook County normal school, who synthesized the fields together and paved the way for the formation of Nature-Study. Jackman of Cook Country normal school established Nature-Study as a school curriculum and Bailey and Comstock of Cornell University formed the American Nature-Study Society and as a result, Nature-Study started to gain popularity. However, many educators increasingly rejected Nature-Study as a unifying topic, and preferred the use of textbooks rather than firsthand experiences. This hindered the nature-study movement and it declined since the 1920s. But today, the Nature-study idea can play a huge role in developing science education, inclusive education centered nature, self-initiated retrieval, sympathy with nature and character building of students.

      • KCI등재후보

        회심의 경험 ―종교심리학적 조명

        박종석 서울신학대학교 기독교신학연구소 2011 神學과 宣敎 Vol.39 No.-

        Conversion in Christian education is important because it is a base and starting point of education. Because the conversion is considered as a psychological event, this article takes religious psychological approach to conversion. Conversion is not restricted to any particular period. In general, conversion experience is possible in any time of adolescence. Radical conversion is high probability for the relatively low level intellectual, other people were most likely in a gradual conversion. Especially, a lot of people who grew up in the atmosphere of religious freedom, was shown in gradual conversion. Through these facts on the conversion, It is known that conversion and human development are closely related. The gradual conversion in stability and order is more desirable rather than the sudden enthusiastic conversion experience in terms of education for religious maturity. Though conversion and education have different dimensions and can not be parallel in general recognition, both establish contact in terms of dealing transcendent dimension. So Christian Education let the rapid conversion to happen for the radical conversion, conversion must be supported by faith community for gradual conversion. 기독교교육에서 회심은 교육의 출발점이며 바탕이기 때문에 중요하다. 회심은 아무래도 심리적인 사건이라 여겨지는 까닭에 이 논문은 회심에 대해 종교심리학적으로 접근한다. 회심은 어느 특정 시기에 국한되지 않고 일반적으로 청소년기 이후 어느 시기에도 가능한 경험임을 알 수 있었다. 그러나 비교적 지적인 수준이 낮고 감정적인 사람들에게 급격한 회심의 가능성이 높고, 그렇지 않은 사람들은 점진적 회심의 가능성이 높은 것으로 나타났다. 특히 자유로운 종교적 분위기에서 성장한 사람들에게 점진적 회심이 많이 나타남을 알 수 있었다. 이런 사실들을 통해 회심은 인간발달과 밀접한 관계가 있음을 알 수 있다. 교육적인 면에서는 열광적이고 급격한 회심 경험보다는 안정되고 질서 있는 점진적 회심이 종교적 성숙의 관점에서 볼 때 더 바람직하다. 전통적으로 회심과 교육은 차원이 다르고 병행을 할 수 없다는 인식이 있지만, 회심과 기독교교육이 둘 다 초월적인 차원을 다룬다는 면에서 접촉점이 마련된다. 그래서 기독교교육은 급격한 회심에 대해서는 회심이 일어나도록, 점진적 회심에 대해서는 회심을 지원해야 하며 그와 같은 일은 신앙공동체 안에서 일어나야 한다

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