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- 저자 : 이상진 ( Sang-jin Lee ) (검색결과 1,029 건)
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달걀껍질의 재 사용에 의해 제조 된 생체용 Calcium Phosphate 분말의 상변화 거동 및 미세구조 변화에 관한 연구
이상진,김주원,Lee Sang-Jin,Kim Joo-Won 한국분말야금학회 2004 한국분말재료학회지 (KPMI) Vol.11 No.5
Calcium phosphate powders were successfully synthesized by using re-cycled eggshell and phosphoric acid. The crystallization behavior and powder morphologies of the synthesized powders were dependent on the starting condition of the eggshell, the mixing ratio and method of the eggshell and phosphoric acid, and calcination temperature. In general, $\beta$-tricalcium phosphate was stably synthesized at about $900^{\circ}C$ for 1h at each proper mixing ratio. And, the synthesized powders showed the similar microstructures to the morphology of original eggshell with uniform particle sizes. In this study, the calcium phosphate powders were synthesized with eggshell in various processing method. And their unique microstructures obtained from the eggshell were also. observed. The crystalline developments and microstructures of the synthesized powders were examined by X-ray diffractometer and scanning electron microscopy.
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일차성 불면증에서 심박동률변이도와 수면구조 간의 상관관계
이상진,박두흠,유재학,유승호,하지현,송만규,Lee, Sang-Jin,Park, Doo-Heum,Yu, Jae-Hak,Ryu, Seung-Ho,Ha, Ji-Hyeon,Song, Man-Kyoo 대한수면의학회 2010 수면·정신생리 Vol.17 No.1
목 적: 일차성 불면증(primary insomnia)은 자율신경계에도 영향을 주는 것으로 알려져 있는데 심박동률변이도 (heart rate variability: HRV)를 이용하여 일차성 불면증에서 심박동률변이도 지수와 수면구조(sleep structure) 관련 변인 간의 연관성을 분석하여 일차성 불면증의 야간수면 동안 자율신경계 변화의 특징을 연구하고자 하였다. 방 법: 일차성 불면증 33명(평균연령: 36.2${pm}$14.2세, 남:여=15:18)을 대상으로 1일밤 야간수면다원검사(nocturnal polysomnography:NPSG)를 시행하여 HRV 지수 중 저주파수/고주파수 비(high frequency/low frequency ratio:LF/HF ratio)와 NPSG에서 산출된 수면구조 관련변인 간의 상관관계를 분석하였다. 결 과: 연령과 성별을 통제한 상태에서 LF/HF ratio와 서파수면(slow wave sleep)의 시간과 분율, 2단계수면시간 (stage 2 sleep)과 분율이 각각 음의 상관관계($r_p$=-0.37, p=0.04, $r_p$=-0.4, p=0.02; $r_p$=-0.42, p=0.02, $r_p$=-0.43, p=-0.01)를 가지는데 비해 각성지수(arousal index)와는 양의 상관관계($r_p$=0.65, p<0.001)를 보였다. 결 론: 일차성 불면증에서 수면구조 변화에 따라 자율신경계가 반응하고 있으며, 특히 비렘수면(Non-REM sleep)의 구성요소인 서파수면과 2단계수면의 감소와 각성 횟수의 증가가 교감신경 항진을 유발하여 불면증의 전형적인 수면 구조 변화가 심혈관계에 부정적 영향을 줄 수 있다는 것을 보여준다. Objectives: It is well established that primary insomnia affects the activity of autonomic nervous system. We tried to know how the activity of autonomic nervous system during night sleep changes by analyzing correlation between heart rate variability (HRV) index and the variables related with sleep structure in primary insomnia. Methods: Thirty three subjects (mean age: $36.2{\pm}14.2$ years, male:female=15:18) who were diagnosed with primary insomnia were selected for the study. Nocturnal polysomnography (NPSG) was carried out on each subject and correlation was analyzed between high frequency/low frequency ratio (LF/HF ratio), one of HRV indices and the variables related with sleep structure which were calculated from NPSG. Results: When age and sex were controlled, LF/HF ratio showed negative correlations with slow wave sleep and stage 2 sleep, respectively ($r_p$=-0.43, p=0.01; $r_p$=-0.37, p=0.04). On the other hands LF/HF ratio showed a positive correlation with arousal index ($r_p$=0.65, p<0.001). The activity of autonomic nervous system responded differentially depending on the change of sleep structure in primary insomnia. Especially the increase of arousal index and the decrease of slow wave sleep and stage 2 sleep which are the components of non-REM sleep provoked hyperactivity of sympathetic nervous system. Conclusion: This study suggests that the typical change of sleep structure in primary insomnia can negatively impact on cardiovascular system.
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이상진,변태호,Lee, Sang-Jin,Byun, Tae-Ho 한국건축역사학회 2002 건축역사연구 Vol.11 No.1
The recently published papers and essays regarding 'tectonic' bring us to rumination of its importance on comprehending modern architectural process. Many architectural theorists may seem to seek the substance of architecture through the discussion of 'tectonic' for the purpose of overcoming the dilemma of representation which can be easily found in modern architectural forms. Their emphasizing on its double-faced aspect as the manner of representation, that is semantic and aesthetic, may imply the significance of philosophical approach especially to the recent architectural phenomena. From this point, it ought to be meaningful to manifest etymological connection between the terms with semantic analysis and interpret the substance and ontological meaning of 'tectonic' referring Martin Heidegger's existential philosophy. Besides the works of Carlo Scarpa, that are known as the art of making, are exampled to prove the way how the ontological meaning of practical act is exposed on an artwork. The idea of 'tectonic' connotes not only technological aspect as construction of form and space, but also ontological aspect as joint or detail, that is the result of logos. The 'tectonic' means etymologically 'joint' having double-meaning structure, technology and aesthetics. It means 'detail' as minimum units of architectural form and as sites where making relationship or connection takes place in the way of ontological apprehension. The 'detail' as the place of innovation and invention implies the culture of an area, and expresses craftsmanship, which modem architecture buries in oblivion. This study aims to deviate from the aesthetical commercialization in which the modern architecture tends to fall, and further, propose the possible way to succeed traditional locality in an epistemological point of view.
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이상진,이훈철,Lee, Sang-Jin,Lee, Hoon-Cheol 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.3
Porous calcium phosphates were successfully fabricated by using a cuttlefish bone. The cuttlefish bone, which is composed of $CaCO_3$, showed a special porous microstructure containing uniform-sized voids. In this study, the pre-forms infiltrated distilled phosphoric acid were sintered at $1200^{\circ}C$ in an air atmosphere. The porous microstructure of the pre-forms was kept their original pattern after sintering with a synthesis of calcium phosphate. The obtained porous calcium phosphate, sintered at $1200^{\circ}C$ for 3 h at 17% concentration of phosphoric acid, showed uniform open pores of 150 ${\mu}m$ in size and $\beta$-TCP phase in the XRD patterns. Above 16% concentration, CaO phase, derived from the decomposition of $CaCO_3$, decreased gradually in the sintered samples, and the measured Ca/P ratios of the samples prepared from 16% and 18% concentration were 1.67 and 1.43, which are close to stoichiometric HA (1.66) and $\beta$-TCP (1.50).
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이상진(Lee, Sang-Jin) 한국문학회 2013 韓國文學論叢 Vol.63 No.-
이 논문은 이윤기 단편소설의 대부분이 설득에 초점을 둔 ‘논증적인 담론’의 성격이 강하게 나타나고 있음을 논거의 발견에서 배열, 표현에 이르는 논증적 수사술의 분석을 통해 밝혀낸 것이다. 논거의 발견에서 이윤기 소설은, 인간 존재의 근원에 대한 보편적 문제를 소설의 주제로 삼아 일상체험에서 문헌텍스트까지 주제 전달에 필요한 ‘권위적 논거’를 끌어와 설득력을 높이고 있다. 소설의 배열에서 정념보다는 로고스가, 이야기성보다는 명징하고 논리적인 예증과 추론이 서사를 지배하고 있으며, 중심이야기를 벗어나 다른 묘사문이나 사건 등을 삽입시키는 여담이 자주 나타난다. 표현에서 수동적인 화자와 평면적이고 개념적인 인물, 그리고 중립적이고 개성 없는 문어체의 말하기가 우세하게 나타난다. 또한 은유를 통해 완곡어법을 구사하지만, 원관념을 명백하게 이해할 수 있도록 대조와 반복법이 쓰이고, 주제단락과 설명이 뒤따른다. 이 같은 수사학적 특징은 그의 소설이 전통적인 소설문법과는 거리가 있다는 것을 보여준다. 소재의 중복과 상호텍스트성은 소설적 완성도를 의심케 하며, 시퀀스들이 분산되고 삽화적으로 나열되어 서사적 통일성이 결핍되어 있다. 또한 은유의 사용으로 새로운 의미가 활성화되는 것이 아니라, 여러 차례에 걸친 설명과 논거에 의해 분명한 메시지로 축소되고 마는, 스스로 죽어가는 메타포가 되었다. 이렇게 하여 그의 소설은 미적 형상화 충동보다는 감정을 직접 표시하고, 세상을 계몽하려는 충동이 훨씬 우세한 소설이 되었다. 결국 원 텍스트의 의미를 벗어나서는 안 된다는 번역자의 철칙이 이윤기의 소설쓰기에서 치명적인 한계로 작용하고 말았음을 알 수 있다. Yoon-Ki Lee is an important writer of the 1990s and has published dozens of novels and short stories. However, they were never subject to a proper evaluation as they were overshadowed by his fame as a translator. This study analyzes the distinct rhetorical features used in Yoon-Ki Lee's short stories to expose issues regarding his narrative style. As a result, this study has found that Yoon-Ki Lee's short stories had a strong tendency to engage in demonstrative discourse. First, he enhances his persuasive power by drawing upon an “authoritative basis” which is necessary to deliver the subject from various sources ranging from daily life experiences and text from relevant literature. Also, the narration is dominated by logos instead of pathos, and clear and logical illustrations and inferences rather than a narrative. It is easy to find the frequent appearance of digressions in his works where he deviates from the main story and inserts other descriptive sentences or events. Although he has a command over euphemism through the use of metaphors, he utilizes contrast, rhyming couplets, palilogy and explanations in oder to convey the original meaning clearly. Such distinct rhetorical features show that his works deviate from the traditional grammatical structure of novels. The repetition of materials and mutual text causes a doubt as to their degree of completion. The narrative of his works lack narrative unity as the short sequences are dispersed and are listed in the form of episodes. The metaphors that he uses have less effect on conveying its meaning due to the repeated explanations and basis of arguments and have become metaphor with no actual purpose. Thus, his works directly express emotions rather than an impulse to create aesthetic expressions, and have become a novel which carries a far more superior impulse to enlighten the public. The ironclad rule of a translator which is to not differ from the meaning of the original text fatally acted as a limitation to the writings of Yoon-Ki Lee.
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이상진,이진주,Lee Sang-Jin,Lee Jin-Ju 한국국방경영분석학회 1976 한국국방경영분석학회지 Vol.2 No.1
This paper is to explore technological forecasting methodologies and their application to military R&D programming. Among a number of forecasting methodologies, eight frequently used methods are explained. They are; Delphi method, analogy, growth curve, trend extrapolation, analytical model, breakthrough, normative method, and combined method. Due to the characteristic situation of a developing country, the application of technological forecasting to the Korean military R&D programming is limited. Therefore, only two forecasting methods such as Delphi and normative method are utilized in the development of a decision model for the military R&D programming. The model consists of a dynamic programming using decision tree model, which optimizes the total cost to equip a certain military item under a given range of risk during a given period. Some pitfalls in forecasting methodologies and of the model are discussed.
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