• 한국통신학회논문지
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• 제35권2A호
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• pp.202-208
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• 2010

WDM/SCM-PON에서 상향 전송을 할 때 다수의 ONU가 단일 광 채널을 공유하여 다수의 신호를 전송할 경우에 수신부에서 잡음으로 작용하는 OBI가 발생하게 되어 전체 시스템의 성능을 악화시키기 때문에 OBI에 대한 문제 해결이 필수적인 과제이다. 본 논문은 SCM-PON에서 상향 전송을 할 때 발생하는 OBI를 헤테로다인 검출 방식으로 극복하는 새로운 방안을 제시하였다. 제안된 방식은 수신 광검출기 앞부분에 별도의 LD를 사용하여 heterodyne detection을 가능케 함으로써, OBI 성분을 검출신호와 구분되도록 하여 OBI로 인한 문제를 해결하는데 근거를 두고 있다. 또한, 가입자단에서 R-SOA를 사용함으로써 경제적인 저가형 ONU 구현을 가능케 하는 장점을 갖는다.

• 한국임상약학회지
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• 제21권1호
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• pp.6-13
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• 2011

Bolus intravenous injection of adenosine resulted the temporal decrease of systemic blood pressure and heart rate in the anesthetized rats. Adenosine also resulted the persistent decrease of contractility and heart rate in the isolated spontaneously beating rat right atria. Both of the above inhibition effets of adenosine were increased by the pretreatment of NBI (nitrobenzylthioinosine), whitch is an adenosine transport inhibitor, but decreased by the pretreatment of 8- phenyltheophy1line, which is an adenosine antagonist. In isolated thoracic aorta ring segment of normotensive rats, intact rings were relaxed by adenosine ($42.3{\pm}8.7%$) and ATP ($85.9{\pm}15.8%$) in the concentration of $10^{-4}M$, but rubbed rings were relaxed by adenosine ($35.2{\pm}1.9%$) and ATP ($11.3{\pm}9.0%$) in $10^{-4}M$. After pretreatment of L-NAME (N-Nitro-Larginine methyl ester), which is an NO inhibitor, adenosine-induced relaxation was not affected, but ATP-induced relax ation was significantly inhibited (P<0.01). Meanwhile, adenosine resulted almost same as vasorelaxation in isolated thoracic aorta of SHR comparing to those of normotensive rats. But, vasodilation responses of ATP in intact rings of SHR are significantly inhibited comparing to those of normotensive rats. Adenosine-induced relaxation is attenuated after 8-phenyltheophylline pretreatment, but increased after NBI pretreatment. However, ATP-induced relaxations are not affected by 8-phenyltheophylline or NBI pretreatment. These results suggested that the hypotensive effects of adenosine was due to the decrease of contractile force and heart rate through the A1 receptor and vasodilation are mediated by A2 receptor of the vascular smooth muscle. And, the heart protective and vasodilation effects of adenosine might suggest that it would be useful in the acute treatment of coronary artery disease.

• 한국발생생물학회:학술대회논문집
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• 한국발생생물학회 2003년도 제3회 국제심포지움 및 학술대회
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• pp.100-100
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• 2003

Pluripotent embryonic stem (ES) cells differentiate spontaneously into beating cardiomyocytes via embryo-like aggregates. We describe the use of mouse embryonic stem (mES03) cells as a reproducible differentiation system for cardiomyocyte. To induce cardiomyocytic differentiation, mES03 cells were dissociated and allowed to aggregate (EB formation) at the presence of 0 75% dimethyl sulfoxide (DMSO) for 4 days and then another 4 days without DMSO (4+/4-). Thus treated EBs were plated onto gelatin-coated dish for differentiation. Spontaneously contracting colonies which appeared in approximately 4-5 days upon differentiation. Expression of cardiac-specific genes were determined by RT-PCR. Rebust expression of myosin light chain (MLC-2V), cardiac myosin heavy chain $\alpha$, cardiac muscle heavy polypeptide 7 $\beta(\beta$-MHC), cardiac transcription factor GATA4 and skeletal muscle-specific ${\alpha}_1$-subunit of the L-type calcium channel (${\alpha}_1 CaCh_{sm}$) were detected as early as 8 days after EB formation, but message of cardiac muscle-specific $\alpha$$_1$-subunit of the L-type calcium channel (${\alpha}_1$CaCh) were revealed at a low level. Strikingly, the expression of atrial natriuretic factor (ANF) was not detected. When spontaneous contracting cell masses were examined their electrophysiological features by patch-clamp technique, it showed ventricle-like action potential 17 days after the EB formation. This study indicates that mES03 cell-derived cardiomyocytes displayed biochemical and electrophysiological properties of cardiomyocytes and DMSO enhanced development of cardiomyocytes in 4+/4- method.

• 한국동물번식학회:학술대회논문집
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• 한국동물번식학회 2003년도 학술발표대회 발표논문초록집
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• pp.76-76
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• 2003

Pluripotent embryonic stem cells can differentiate into beating cardiomyocytes with proper culture conditions and stimulants via embryo-like aggregates. We describe here the use of mouse embryonic stem (mES03) cells as a reproducible differentiation system for cardiomyocyte. mES03 cells growing in colonies were dissociated and allowed to re-aggregated in suspension [embryoid body (EB) formation〕. To induce cardiomyocytic differentiation, cells were exposed to 0.75% dimethyl sulfoxide (DMSO) during EB formation for 4 days and then another 4 days without DMSO (4+/4-). Thus treated EB was plated onto gelatin-coated dishes for differentiation. Spontaneously contracting colonies which appeared in approximately 4~5 days upon differentiation were mechanically dissected, enzymatically dispersed, plated onto coverslips, and then incubated for another 48~72 hrs. By RT-PCR, robust expression of cardiac myosin heavy chain $\alpha$, cardiac muscle heavy polypeptide 7 $\beta$($\beta$-MHC), cardiac transcription factor GATA4, and skeletal muscle-specific $\alpha$$_1$-subunit of the L-type calcium channel ($\alpha$$_1$CaC $h_{sm}$ ) were detected as early as 8 days after EB formation, but message of cardiac muscle-specific $\alpha$$_1$-subunit of the L-type calcium channel ($\alpha$$_1$CaCh) were reveled at a low level. In contrast, expression of myosin light chain (MLC-2V) and atrial natriuretic factor (ANF) were not detected during EB formation for 8 days. However, a strong expression of the atrial-specific ANF gene was expressed from day 8 onward, which were remained constant in EB. (cardiac specialization and terminal differentiation stage). Electrophysiological examination of spontaneously contracting cells showed ventricle-like action potential 17 days after the EB formation. This study indicates that mES03 cell-derived cardiomyocytes via 4+/4- protocol displayed biochemical and electrophysiological properties of subpopulation of cardiomyocytes.

• 여성건강간호학회지
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• 제7권4호
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• pp.560-578
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• 2001

The purpose of this study was to develop prevention and educational programs for battered women. The first stage was to assess battered women's health status and health needs. The second stage was to develop prevention and educational programs to improve battered women's health. A survey research design was used to gather data from June-November 1999 by the counselor. Research sample was recruited from shelter and women's counseling centers in Seoul, Inchon, Chooncheon, Taejeon, and Jeoju. Trained counselors contacted 218 women, who agreed verbally to participate in the study. The researcher did a literature review and developed the tool used. We did ten pretests and three counselors checked the tool for content validity. The reliability and validity of the instrument were acceptable. The second stage of the research consisted of lay-professional groups discussing the abuse problems and possible solutions. Each group had five professionals (counsellor, nurse, minister, psychiatrist, social worker) and five women who have experienced battering from her husband in community. Result of the survey and two(lay persons and professionals) group discussions showed that victims need more assessment of physical, mental and spiritual needs. Victims were beaten more often during their pregnancies than at other times. Various kind of strategy were frequently utilized, but still the number of women abused and suicides committed increased. Both studies showed that the women experienced severe beating, that they felt powerless, that they need to understand that society abuser characteristics, that they lack a protection support system and that society lacks would an understanding of battered women. Based on the result of both studies, we developed model for prevention and education of battered women. This educational program will increase women s power to solve the abuse problems. The ultimate goal of the program is to develop a one-stop center to give wholistic approach care to women in abuse situations.

• 한방재활의학과학회지
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• 제21권2호
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• pp.211-226
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• 2011

Objectives : The purpose of this study is to establish literatural evidence about traditional Korean medical physiotherapy through literatural review. Methods : Applicable paragraphs which were related to the traditional Korean medical physiotherapy were phrased from in "Hwang-je-nae-gyung(黃帝內經)", "Yumun-sa-chin(儒門事親)", "Geum-guei-yo-ryack(金匱要略)", "Eui-hack-ip-mun(醫學入門)", "Gyung-ack-jeon-seo(景岳全書)", "Eui-hack-gang-mock(醫學綱目)", "Dong-eui-bo-gam(東醫寶鑑)" where were archiving of Oriental or Korean medicine literatures. Searched paragraphs were analysed for establishing historical and theoretical bases of Korean medical physiotherapy. Results : 1. Theromtherapy is originated from yu(熨), hot hand, warm, water bath, warm earth, fumigation, lamp, torchlight and brazier. Matching indications are various musculoskeletal pain and diseases, skin diseases such as chronic inflammation, frostbite, gynecological and urogenital diseases such as uterine myoma, lower abdominal pain, metrorrhagia, breast diseases, digestive tract diseases such as vomiting, diarrhea, stomachache and also it treats cardiovascular disease. Other matching indications are sunstroke, rhinorrhea, psycosis and anal pain. And it used helping acupuncture therapy. 2. Cryotherapy is originated from lengfu(冷敷), lengtie(冷貼), cold stone and cold water. Matching indications are various fever disease, skin diseases such as acute inflammation, wound, fever skin disease, otorhinolaryngological diseases such as acute sore throat, otitis, stomatitis, nasal bleeding and contusions, abrasions, burn and dysuria. In addition, it treats extremity coldness, chillness, stomachache caused to accumulate fever. 3. Physiotherapy by circulating meridian system is originated from manipulation such as pushing, massage and beating to therapy point. Matching indications are musculoskeletal diseases such as various muscular pain, heavy sensation, convulsion, urogenital diseases such as dysuria, lower abdomen pain, digestive tract diseases such as stomachache, and paralysis due to blocked meridian system. And other matching indications are psycosis, leprosy, hypoesthesia, acute stroke. In addition it helps other therapy methods. In addition, the power of manipulation classify to strengthen and reduce. 4. Physiotherapy by balancing meridian system is originated from sunshine, magnet, horn, bamboo and tube. Sunshine helps improving self's care and cure inflammatory skin disease. Magnet's matching indications are paralysis, various injuries, abscess, fever and eye disease. Cupping therapy treats to skin diseases and internal diseases such as tuberculosis. Conclusions : Traditional Korean medical physiotherapy was widely used in traditional Korean medicine since ancient time based on the traditional Korean medical principle and anatomical knowledge. With modern physiotherapy and traditional Korean medicine together, effects of treatment are enhanced. And traditional Korean medical physiotherapy is appropriated to world physiotherapy's expectation.

• 헤리티지:역사와 과학
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• 제52권3호
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• pp.240-251
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• 2019

울산 하대고분에서 출토된 판상철부의 미세조직을 금속학적 방법으로 분석하여 제작기술을 살펴보았다. 또한 기존의 판상철부 연구자료와 비교 및 검토하여 판상철부에 적용된 다양한 제작기술을 파악하였다. 울산 하대고분 44호 목곽묘에서 나란히 배열된 상태로 출토된 판상철부 10점을 과학적으로 분석한 결과, 판상철부의 제작기술 체계를 '(1) 순철-형태 가공, (2) 순철-형태 가공-침탄, (3) 순철-형태 가공-침탄-탈탄' 세 가지 유형으로 분류할 수 있었다. 판상철부는 모두 단조에 의해 제작되었고, 순철을 소재로 두드려 형태를 만들었다. 특히 다수의 판상철부는 형태 가공 후 침탄 처리를 통해 재질을 강화시켰는데, 이는 중간 소재 또는 화폐로 통용됨으로써 당시 제철산업의 근간을 이루었던 철강 제품인 것으로 보인다. 한편 형태 가공이나 침탄 이후에는 담금질이 실시되지 않았다는 공통점을 가진다. 순철을 소재로 제작한 판상철부의 미세조직에는 불순 개재물이 다량 포함되어 있고, 비금속 개재물을 성분 분석한 결과, 유리상과 뷔스타이트가 함께 혼재한 철재(鐵滓)의 특징을 보여주므로 제련 공정에서 저온환원법이 적용되었을 가능성이 크다.

• 자원리싸이클링
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• 제15권3호
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• pp.38-45
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• 2006

슬러지 층에 열을 가함으로서 내부증발압, 여액 점도 저하에 따른 유동성 증대 그리고 기공형성 용이성을 통하여 슬러지의 탈수율을 향상시킬 수 있는 열 필터프레스 탈수 기술을 개발하였다. 크기 $470{\times}470mm$인 PP재질의 맨브레인 플레이트 사이에 열수가열판을 장착하여 온도 $95^{\circ}C$, 압력 $1.2kg_f/cm^2$의 열 수를 공급한다. 그리고 슬러지는 최초 슬러지의 $5kg_f/cm^2$의 공급압력에 의해 1 차 탈수가 이루어지며, 맨브레인의 압착력 $15kg_f/cm^2$에 의해 2차적 탈수 공정으로 이루어진다. 갈수기와 우수기때의 슬러지의 초기 함수율 및 유기물 함량을 고려하여 열 탈수 특성을 평가한 결과 우수기의 슬러지는 케이크의 함수율이 약 35 wt%이며, 탈수 속도는 $4DSkg/m^2{\cdot}hr$로 매우 탈수성 우수하였으며, 갈수기 때의 슬러지 또한 함수율이 50 wt%, 탈수속도가 $1.5kg/m^2{\cdot}hr$이상으로 기계식 탈수의 탈수율(함수율 70 wt%, 탈수속도 $0.9kg/m^2{\cdot}hr$)에 비하여 우수하였다. 이를 바탕으로 열 필터프레스 탈수장치의 추가 소요 에너지를 평가한 결과 고형물(DS) 1 kg처리하는데 소요되는 에너지는 약 300kJ로 평가되었다. 이는 탈수케이크를 재차 건조하는 시스템과 의 에너지 투입비를 분석해 본 결과 열 탈수장치의 에너지 소요량은 약 1/3정도로 감소된 것으로 분석되었다. 본 기술은 기존의 필터프레스에 비하여 탈수 속도가 빠르고 저 함수율 탈수 케이크 생산이 용이할 뿐만 아니라 건조장치에 비하여 에너지 소모량이 적어 경제성이 우수한 시스템으로 파악되었다.

• Childhood Kidney Diseases
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• 제6권2호
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• pp.131-141
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• 2002

목적 : 아시아 각 국가들간의 소아 신이식 성적은 많은 수준 차이가 존재하고, 몇몇 선두그룹을 제외하고 전체적으로 서구에 비하여 많이 뒤떨어지는 것은 사실이지만 소아 신이식 성적에 영향을 미치는 관련 조건들이 서로 비슷한 경향을 가지고 있기에, 아시아 각국의 소아 신이식 경험의 축적과 관련 자료의 비교분석이 앞으로 신이식성적의 향상에 있어 서구의 자료보다 더욱 많은 도움을 줄 수 있을 것이고, 이번 조사를 계기로 이러한 공동 연구의 바탕이 될 수 있는 국가별 신이식 등록사업과 국가간 자료 교환 사업의 활성화가 원활하게 이루어지기를 기대하여 본 연구를 시작하게 되었다. 대상 및 방법 : 이식현황에 대한 자료수집은 아시아 각국의 소아신장학회에 보낸 설문과 각국에서 보내온 여러 다른 기준과 형식의 자료를 총괄하여 시행하였고 총 11개국이 본 조사에 참여하였으며 우리나라 국내 소아 신이식 현황은 KONOS(Korean Network for Organ Sharing)의 자료와 국내 최대 신이식 증례를 보유하고 있는 2개 단일기관의 자료를 기준으로 알아보았다. 결과 : 아시아 각국의 소아 신이식 상황을 비교한 결과 매년 시행되는 소아 신이식례의 숫자는 해마다 증가하고 있으며 현재 아시아에서 소아 신이식이 가장 활발하게 이루어지고 있는 한국, 일본의 경우 최근3년간 연간 40-50례 정도가 시행되고 있다. 소아 신이식 등록사업은 한국, 일본, 싱가폴, 홍콩, 말레이시아 등에서 시행되고 있으나 서구에 비하여 참여도가 낮고, 체계적인 자료수집과 추가자료의 보충과정의 미비로 신이식 전반에 걸친 완벽한 국가적 소아 신이식 통계의 보유가 어렵고, 국가간의 자료를 수시로 교환하여 비교할 수 있는 통일된 프로그램의 운용은 더욱 생각하기 어려운 실정이다. 결론 : 통일된 프로토콜이 아닌 부분적으로 수집된 자료이지만 이번 아시아 각국의 소아 신이식 자료의 비교 연구는 아시아 신이식 현 수준을 파악하고 이식성적의 향상을 위한 등록사업과 자료교환사업의 필요성을 촉구하는데 충분히 도움이 될 수 있을 것으로 생각되었다.