오스테나이트계 Fe-25Mn-Al-0.5C 강의 피로성질에 미치는 Al 첨가의 영향

도정호,권숙인,전채홍 한국열처리공학회 1998 熱處理工學會誌 Vol.11 No.4

The effect of Al addition on the fatigue properties of austenitic Fe-25Mn-Al-0.5C steels was studied. When Al was not added to the Fe-25Mn 0.5C steel. the strain induced ε martensites, deformation twins and slip bands were formed during fatigue deformation. When 2wt% of Al was added to the steel, the deformation twins and slip bands were formed during fatigue deformation. When 5wt% of Al was added, only slip bands were formed. In low cycle fatigue test, the alloys containing 0wt% and 2wt%Al showed the cyclic hardening due to ε martensites and deformation twins, resulting in shorter fatigue lives than the alloy containing 5wt%Al. In fatigue crack propagation test, the alloy without Al showed the highest crack propagation rate. The fracture surface of the alloy without Al was flat, whereas that of the alloy with 2% or 5%Al was rough. The ΔK_(th), values of the alloys with 0%, 2% and 5%Al were 16, 17.5, and 20.5 MPam^(1/2), respectively.

Histidine 및 Histamine 의 N - carbethoxy 유도체 형성시 수종의 수산기함유 아미노산의 치환 에스터화작용에 대하여

조도현,제이데그레,피파디여 한국농화학회 1977 Applied Biological Chemistry (Appl Biol Chem) Vol.20 No.1

The transesterification of some hydroxylated amino acids derivatives was studied by gas-liquid chromatography and combined gas-liquid chromatography-mass spectrometry and the fragmentation of these two different O-derivatives was discussed.

활동성 크론병에서 초기 스테로이드 치료 반응에 따른 임상적, 생화학적, 병리학적 인자들에 관한 연구

김영호,장재권,김지은,최규완,박동일,도재혁,백승운,고광철,이풍렬,이종철,현재근,안병훈,김재준,류민규 대한소화기내시경학회 2001 Clinical Endoscopy Vol.22 No.6

Background/Aims: The predictory factors of the response to initial steroid therapy in active Crohn's disease has been controversial in numerous literature reviews. We evaluated any predictory faetor of the response to initial steroid therapy in active Crohn`s disease patients, Methods: The medical records of 32 patients with active Crohn`s disease who clinically responded to oral steroid therapy were retrospectively reviewed. The steroid responsive group was defined as the one showing maintenance of response for more than one month from steroid withdrawal and the steroid dependent group as the one showing relapse or exacerbation during steroid tapering or within 30 days from steroid withdrawal. The clinical, biochemical, and pathologic factors were evaluated. Results: There were 22 male and 10 female patients. The mean age was 28.9 years. The number of steroid responsive and dependent group was 22 (68.8%) and 10 (31.2%), respectively. There were no significant differences between these two groups in age, sex, time to diagnosis, perianal lesion, extent of disease, extraintestinal manifestations, presence of granuloma, presenting features, hemoglobin, ESR, and CRP, except serum albumin level. Conclusions: Serum albumin level was significantly lower in steroid dependent group than steroid responsive group, reflecting severe inflammation in steroid dependent group.

위장관 간질종양의 임상 및 병리학적 고찰

김영호,장우영,이순진,손희정,최규완,도재혁,백승운,이준행,이풍렬,이종철,박철근,임윤정,김갑철,김재준,임효근 대한소화기학회 2001 대한소화기학회지 Vol.37 No.3

Background & Aims: Gastrointestinal stromal tumor (GIST) constitutes primary nonepithelial neoplasms of the gastrointestinal tract and includes most tumors previously designated as leiomyomas/leiomyosarcomas. GIST is pathologically divided into benign, borderline and malignanct tumor. This study was carried out to delineate the clinical and pathologic features of GIST and to establish the features predicting malignancy. Methods: Clinicopathologic data of 84 patients who had GIST from 1995 to 1999 were reviewed. Results: The subjects were 42 men and 42 women, and their mean age was 59.3±13.2 years. We located fifty-two tumors in the stomach, 28 tumors in the small intestine and 4 tumors in the colorectum years. Histopathology revealed benign tumors in 23 of the 84 patients, borderline tumors in 22, malignant tumors in 39. The average size of tumors was 6.23 cm in diameter (range, 0.6-26 cm). Metastasis was noted in 15.5% of the patients at diagnosis. On endoscopy, ulceration was more common in malignancy. Endsonographic findings except size were not significant statistically. On contrast enhanced computed tomography, malignancy showed more irregular shape and variable attenuation than benign lesions, which seemed to be valuable factor. Conclusions: The variables predicting malignancy were large tumor size (≥5 cm), location of the colorectum, palpable abdominal mass, ulceration on endoscopy, and less uniformity in shape and variable attenuation on computed tomography.

성인에서 반복적인 위장관출혈로 발현한 공장 거대 중복성 낭종

김영호,이경수,이상수,문원,강태욱,최규완,박동일,도재혁,백승운,이풍렬,이종철,김재준,류민규 대한내과학회 2001 대한내과학회지 Vol.61 No.3

Duplication of the alimentary tract is an unusual congenital anomaly which may occur at any level, from the oral cavity to the rectum. Jejunal duplication cyst is quite rare and most of them are presented in infancy with the symptoms of abdominal mass, obstruction, hemorrhage and perforation. But some cases has not been diagnosed till adult if duplication cyst was too small enough to cause symptoms. We report a case of a 28-year-old woman who presented with recurrent gastrointestinal hemorrhage as a result of an ulceration without ectopic mucosa in jejunal duplication cyst and was successfully treated with surgery.(Korean J Med 61:264-269, 2001)

정도전의 사공학 수용과 정치사상

도현철 ( Hyun Chul Do ) 한국사상사학회 2003 韓國思想史學 Vol.0 No.21

권근의 유교 정치 이념과 정도전과의 관계

도현철(Do, Hyeon-chul) 한국역사연구회 2012 역사와 현실 Vol.- No.84

Examined in this article is how Gweon Geun justified his serving of two countries, and why he decided to cooperate with Jeong Do-jeon. Gweon Geun wanted to make the world a place ruled by Confucianism instead of Buddhism. He compiled important academic points of the Confucian philosophy when he wrote Ib’hak Do’seol and 『O’gyeong Cheon’gyeon-rok』. He intended to establish Confucianism as a legitimate, one-and-only righteous form of study. He argued that Confucianism was the ‘real, substantial’ philosophy(實學) to lead the world, and criticized Buddhism as a heresy that would impede the world’s efforts to become a better one. Based upon a Neo-Confucian view of the world, he criticized Buddhism as a school of thoughts that did not recognize the objective world and its principles, and a mere form of belief that eventually forced people to ignore their own human obligations. In his eyes, Buddhism was a religion for the animals, as it allowed people to sever all the personal relationships, either between a king and a vassal, or between a father and son, by having them commit to a Buddhist way of life. He also argued that Buddhism considered all actions as of the mere heart(imagination), and did not acknowledge the existence of a principle or an obligation, from which the actions would generate, or upon which the actions would operate. With Neo-Confucian theories regarding the ‘Human nature(“Inseong, 人性”)’ and the ‘Law of Nature(“Cheon’ri, 天理)’ in mind, Gweon Guen considered morality to be very important, and hoped for an enlightenment to come to the people, based upon all that. He also wanted a world in which the people’s good nature would be more refined(or corrected from a corrupted state) with the concept of ‘Respect(Gyeong, 敬),’ so that morality could firmly be established. In order to maintain social stability and order, he preferred a character-building exercise based upon people’s moral nature and respect, to the employment of external forces such as law enforcement or institutional corrections. He wanted to reinforce school education, and modified the national examination system to prioritize Creative writing(製述), so that the Confucian concept of morality would dominate the people’s consciousness and living patterns. In the meantime, Gweon Geun decided to join the new dynasty and bring his plans to realize his political philosophy in motion. First, to support Jeong Do-jeon’s plans for a new dynasty in theoretical terms, he authored the foreword for 『Bulshi Jab’byeon』, and highlighted the book’s meaning. He depicted Jeong Do-jeon as a visionary who intended to establish a new country, and explained Jeong’s academic traits, from the perspective of the Neo-Confucian argument of legitimacy. Gweon Geun participated in the publication of 『Gyeong’je Mun’gam』 which did not thoroughly cited all the Chinese materials consulted in its creation. In 『Gyeong’je Mun’gam』, Jeong Do-jeon cited the Chinese texts yet marked them as his own thoughts, and Gweon Geun did the same, because he agreed with Jeong Do-jeon’s thoughts and accommodate his intentions. In short, Gweon Guen tried to establish an idealistic Confucian soceity, and joined the Joseon government, established a relationship with the powerful Jeong Do-jeon, and tried to accommodate his intentions.

Time-Related Changes in Detrusor Overactivity in Awake Rats with Spinal Cord Injury Observed by Simultaneous Registrations of Intravesical and Intraabdominal Pressures

Jin, Long-Hu,Shin, Hwa-Yoan,Yoon, Seung-Hwan,Seong, Do-Hwan,Park, Chang-Shin,Lee, Tack,Yoon, Sang-Min Korean Continence Society 2011 International Neurourology Journal Vol.15 No.1

<P><B>Purpose</B></P><P>To compare the physical characteristics of detrusor overactivity (DO) induced by intravesical infusion of saline in awake, sham rats and rats with chronic spinal cord injury (SCI), by simultaneous registrations of intravesical and intraabdominal pressures.</P><P><B>Methods</B></P><P>Male Sprague-Dawley rats, normal or with a spinal vascular clip at the level of Th9, were investigated cystometrically 1 and 4 weeks after SCI. Intravesical pressure (IVP) and intraabdominal pressure (IAP) were recorded simultaneously to evaluate true DO. During the filling phase, the event of IVP rises, defined as increments that exceeded 2 cmH<SUB>2</SUB>O from baseline, were determined as DO according to the absence of simultaneous changes in IAP.</P><P><B>Results</B></P><P>All SCI rats exhibited DO during the filling phase, which was not shown in sham rats. The frequency and pressure of DO had a tendency to decrease with time. The DO frequency of SCI rats after 4 weeks (0.9±0.2 min<SUP>-1</SUP>) was decreased compared with that after 1 week (2.1±0.4 min<SUP>-1</SUP>; P<0.05). The DO pressure of SCI rats after 4 weeks (8.4±1.9 cmH<SUB>2</SUB>O) was decreased compared with that after 1 week (11.6±2.9 cmH<SUB>2</SUB>O; P>0.05).</P><P><B>Conclusions</B></P><P>Cystometric studies in awake male SCI rats showed some significant changes in bladder function after SCI. All SCI rats exhibited DO during the filling phase, and showed different physical characteristics of DO over the course of time. The neurological basis of these time-related changes remains poorly understood, but may provide important prognostic information about long-term urological management in SCI patients.</P>

DO와 ORP를 이용한 축산폐수처리 SBR운전 제어

전병희 ( Byong Hee Jun ),김도환 ( Do Hwan Kim ),최은희 ( Eun Hee Choi ),김성신 ( Sung Shin Kim ),김창원 ( Chang Won Kim ),배현 ( Hyeon Bae ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.5

A pilot scale SBR (working volume, 20㎥) treating piggery wastewater was operated with real wastewater. The operation mode of intermittent feeding of raw water and sub-cycle with repeating anoxic-aeration conditions were adapted to avoid the high-strength nitrogen inhibition. In sub-cycle, aeration time for nitrification was tried to be controled with ORP and/or DO meter. The characteristics of control was somewhat different between ORP and DO. DO showed potential ability to detect complete ammonia oxidation point by the first order differential values or absolute value. Especially, DO was proved to be useful for high loading rates. ORP indicated the ending point of nitrification by the plateau appearing after bending point. Because ORP can be utilized as a diagnosis tool by its good sensitivity for the microbial condition in reactor, the simultaneous application of DO and ORP was recommended for the stable control of SBR.

대책문을 통해 본 조선초기 군주성학론

도현철(Do, Hyeon-Chul) 연세대학교 국학연구원 2018 동방학지 Vol.183 No.-

This paper focuses on the historical fact that the name Geunjeongjeon(勤政殿), created by Chung Do-Jeon(鄭道傳), means “diligence helps governance”, and he set a theme about monarchies’ diligent governance for the civil service examination in the 5th Year of Taejo, and then aims to examine the political ideas of the Joseon Dynasty through analyzing the answer sheets written by Kim Ik-Jung(金益精) who was the top examination passer that year. Chung Do-Jeon established the goal for political systems and ideas of the Joseon Dynasty and suggested the ideal monarchy which was essential in managing the monarchy-state. His viewpoint of monarchy was found out while Hangyang City Wall was constructing at the time of the founding of the country. The construction of Gyeonbokgung was completed in the 4th year of Taejo(1395) and the name of Geunjeongjeon, which means “diligence helps governance” indicated the Neo-Confucian ideal for monarchy. Chung Do-Jeon asked what the ways of practice for monarchies’ diligent governance are as a theme for the civil service examinations. Kim Ik-Jung, the top examination passer, suggested in his answer sheets that monarchies should practise the diligent governance on the basis of the Neo-Confucianism, and they should possess sagacious judgements of the right policy to be conducted diligently, and that they should open the offices to the wise men in order to be helpful to monarchies’ sagacity, and that they should strive to figure out people’s actual circumstances, and that they should not be contrary to the most pressing agenda and the late King’s precedents. This is what Kim Ik-Jung organized diligent governance by appealing to Neo-Confucian Sung-Hak(聖學, Learning of the Sage) according to Chung Do-Jeon’s ideal for monarchy. 본고는 정도전이 태종 4년에 근정전의 의미를 설명하면서 군주의 근면 정치를 제시하고, 태조 5년에 과거시험 문제로 군주의 근면 정치를 제시했다는 점에 착안하여, 태조 5년 과거 시험의 장원 급제자인 김익정의 답안지를 분석하여 조선의 정치이념을 살펴본 글이다. 조선왕조의 정치체제와 정치이념의 방향을 설정하였고, 왕조국가의 정치운영의 핵심인 이상군주론을 제시하였다. 정도전의 군주관은 조선왕조 건국기에 한양 도성 건설 사업의 과정에서 나타났다. 1395년(태조 4) 9월 경복궁이 완성되고, 근정전이라는 명칭을 통해 군주의 근면 정치라는 성리학적 군주상이 제시되었다. 다음 해인 1396년(태조 5) 5월 과거 시험 문제에서 정도전은 시험 문제로 군주의 근면한 정치의 구체적인 실천방법을 질문하는 것이었다. 이 시험의 장원급제자인 김익정은 성리학적 사유를 바탕으로 군주가 근면한 정치를 행하되, 근면하게 시행해야 할 올바른 정책에 대한 명철한 인식을 가질 것, 현자를 등용하여 군주의 명철함을 돕도록 할 것, 백성들의 실정을 파악하는 데 힘쓸 것, 당대의 급선무와 선왕의 전례에 어긋나지 않도록 할 것 등의 구체적인 방법을 제시하였다. 이는 정도전의 이상군주론에 부응해서, 김익정이 군주의 근면한 정치를 성리학의 성학론으로 풀어 정리한 것이다.