돼지 대동맥동에 대한 해부학적 연구

최성환,정기수,김인식,태현진,박영재,심정하,안동춘,Choi, Seong-Hwan,Cheong, Ki-Soo,Kim, In-Shik,Tae, Hyun-Jin,Park, Young-Jae,Sim, Jeoung-Ha,Ahn, Dong-Choon 대한수의학회 2006 大韓獸醫學會誌 Vol.46 No.1

This study was aimed to obtain the anatomical information on the location of ostia of left and right coronary artery in 3 weeks old and 6 months old hybrid swine. The each intercommissural distance of 6 months group was twice than 3 weeks old group. The largest sinus was right aortic sinus followed by left and posterior sinus. All left coronary artery ostia in left aortic sinus were located near the right aortic sinus as well as lower than the ostia of right one. Most of the right coronary artery ostia were located at the level of supravalvular ridge of right aortic sinus. In addition the right ostia had more variation than left ones. Comparing to the sites of 3 weeks old pigs, the sites of the right ostia in 6 months group were more variable. These data suggest that the locations of coronary ostia were different with the sites of human's, and changes of the location may be occurred during the growth.

청간플러스(가미청간탕(加味淸肝湯))로 호전된 뇌경색을 동반한 C형간염 환자 1례 및 알코올성 간염 환자 1례

최성환,장문원,박소애,임승민,안정조,조현경,유호룡,설인찬,김윤식,Choi, Seong-Hwan,Chang, Mun-Won,Park, So-Ae,Lim, Seong-Min,An, Joung-Jo,Jo, Hyun-Kyung,Yoo, Ho-Rhyong,Seol, In-Chan,Kim, Yoon-Sik 대한한의학방제학회 2008 大韓韓醫學方劑學會誌 Vol.16 No.2

This study is a clinical report for hepatitic C patient and alcoholic hepatitis patient who were improved by treatment of a herbal viscous extracts(Chunggan plus). We checked up Aspartate-aminotransferase(AST), Alamine-aminotransferase(ALT) and ${\gamma}$-Glutamyl transpeptidase (${\gamma}$-GTP) and compared the level of AST, ALT, ${\gamma}$-GTP after treatment. After medication the level of AST, ALT, ${\gamma}$-GTP was significantly normalized. So we suggested that herbal viscous extracts(Chunggan plus) has effects on hepatitis.

러시아-우크라이나 전쟁(러시아의 우크라이나 침공)의 우주전 분석 및 양상 그리고 우주기술 개발시 고려사항

최성환,Choi, Seonghwan 한국우주과학회 2022 우주기술과 응용 Vol.2 No.2

In this article, Russia's space threat assessment and space warfare in the Russia-Ukraine war (Russian invasion of Ukraine) were analyzed and summarized. Considering the probability that commercial satellites will also be potential targets of space warfare, it is suggested that not only military satellites but also commercial satellites develop and apply space technology that can be applied equally to space threats when developing space technology. Necessary space technologies is listed.

양성자 조사법에 의한 PT-IGBT의 Turn-off 스위칭 특성 개선

최성환,이용현,권영규,배영호,Choi, Sung-Hwan,Lee, Yong-Hyun,Kwon, Young-Kyu,Bae, Young-Ho 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.12

Proton irradiation technology was used for improvement of switching characteristics of the PT-IGBT. Proton irradiation was carried out at 5.56 MeV energy with $1{\times}10^{12}/cm^2$ doze from the back side of the wafer. The I-V, breakdown voltage, and turn-off delay time of the device were analyzed and compared with those of un-irradiated device and e-beam irradiated device which was conventional method for minority carrier lifetime reduction. For proton irradiated device, the breakdown voltage and the on-state voltage were 733 V and 1.85 V which were originally 749 V and 1.25 V, respectively. The turn-off time has been reduced to 170 ns, which was originally $6{\mu}s$ for the un-irradiated device. The proton irradiated device was superior to e-beam irradiated device for the breakdown voltage and the on-state voltage which were 698 V and 1.95 V, respectively, nevertheless turn-off time of proton irradiated device was reduced to about 60 % compared to that of the e-beam irradiated device.

우주 쓰레기 제거기술을 활용한 우주무기 개발 개연성 고찰 및 우주기동전(Space Maneuver Warfare)의 이해

최성환,Seonghwan Choi 한국우주과학회 2023 우주기술과 응용 Vol.3 No.2

According to the studies recently published through advanced maui optical and space surveillance technologies (AMOS) Conference 2021, LEO conjunction assessment revolves around not on operating satellites but space debris such as rocket bodies and non-operational satellites, hence suggesting a solution through space traffic management. Against this backdrop, the issue of active debris removal (ADR) has emerged to the surface as an international challenge throughout the globe. In step with this, the United Nations General Assembly approved a resolution calling on nations to halt tests of direct-ascent anti-satellites, to which U.S. and twelve other nations included Republic of Korea were original signatories. ADR techniques are also actively being researched in the civil sector, and these commercial services, if successfully developed, could possibly be utilized for military use as well. As such, this paper will help readers' understanding for the current status of ADR techniques, space threat assessments, on-orbit rendezvous and proximity operations by looking at previous cases, reflecting on space-faring nations' ADR techniques and its development probability in relation to space weapons. As a conclusion, this study will propose the needs of developing space propulsion system by understanding Space Maneuver Warfare in preparation for the future space battlefield.

Ni계 다공체 금속의 고온 산화 거동

최성환,윤중열,이혜문,공영민,김병기,이기안,Choi, Sung-Hwan,Yun, Jung-Yeul,Lee, Hye-Mun,Kong, Young-Min,Kim, Byoung-Kee,Lee, Kee-Ahn 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.2

This study investigated the high temperature oxidation behavior of Ni-22.4%Fe-22%Cr-6%Al (wt.%) porous metal. Two types of open porous metals with different pore sizes of 30 PPI and 40 PPI (pore per inch) were used. A 24-hour TGA test was conducted at three different temperatures of $900^{\circ}C$, $1000^{\circ}C$ and $1100^{\circ}C$. The results of the BET analysis revealed that the specific surface area increased as the pore size decreased from 30 PPI to 40 PPI. The oxidation resistance of porous metal decreased with decreasing pore size. As the temperature increased, the oxidation weight gain of the porous metal also increased. Porous metals mainly created oxides such as $Al_2O_3$, $Cr_2O_3$, $NiAl_2O_4$, and $NiCr_2O_4$. In the 40 PPI porous metal with small pore size and larger specific surface area, the depletion of stabilizing elements such as Al and Cr occurred more quickly during oxidation compared to the 30 PPI porous metal. Ni-Fe-Cr-Al porous metal's high-temperature oxidation micro-mechanism was also discussed.

대요근에 대한 근에너지기법을 이용한 자세이완기법 적용: 사례연구

최성환,홍현표,Choi, Sung-hwan,Hong, Hyun-pyo 대한정형도수물리치료학회 2017 대한정형도수물리치료학회지 Vol.23 No.1

Background: Positional release muscle energy technique (PRMET) is a method joined positional release technique and muscle energy technique. Methods: Subjects those who have low back pain from the acute to chronic phase, were applied PRMET method on psoas major muscle and measured the changes in pain and disfunction. Results: PRMET method is effective for reducing pain and disfunction on psoas major muscle. Conclusions: The advantages of PRMET method are minimized patient inconvenience, shortening of treatment time and effective for improvement. In the future research, methods need to be improved so that this can be applied to other muscles.

흉비(胸?), 부면(不眠), 변비(便秘)를 동반한 뇌경색 환자의 대황황련사심탕(大黃黃蓮瀉心湯) 치험례

최성환,김진미,장문원,문승희,조현경,설인찬,Choi, Seong-Hwan,Kim, Jin-Mi,Chang, Mun-Won,Mun, Seung-Hee,Jo, Hyun-Kyung,Seol, In-Chan 대한한의정보학회 2009 大韓韓醫情報學會誌 Vol.15 No.2

Objective: The aim of this study is to show one case of cerebral infarction patient with chest discomfort, insomnia and constipation improved by Daehwanghwangryeonsasim-tang. Methods: The patient was treated with herbal medicine (Daehwanghwangryeonsasim-tang) and acupuncture. Changes in symptoms for treatment period were observed. Result: Intensity and frequency of chest discomfort was decreased. Sleep time was increased and constipation was improved. Conclusion: Daehwanghwangryeonsasim-tang is effective on symptoms of the pattern of heart heat and fire-heat.

생약재를 이용한 고지혈증 치료의 연구 동향 고찰

최성환,손창규,김진미,설인찬,Choi, Seong-Hwan,Son, Chang-Gue,Kim, Jin-Mi,Seol, In-Chan 대한한방내과학회 2010 大韓韓方內科學會誌 Vol.31 No.3

Objective : To summarize and make a reference number of antihyperlipidemic herbal plants worldwide. Method : We surveyed all papers of antihyperlipidemic studies using herbal plants in Pubmed database as "hyperlipidemia AND herb", "hyperlipidemia AND herbal", etc. of Default Tag "Title". The number of papers, the formation of experiments, frequency of herbal plants studies, and main studies were analyzed. Result : Total 178 studies were finally selected. The number of papers were rapidly was increased since 1998. RCT studies were most papers(39.9%). Most studies were about plant sterol or plant stanol studies(78%). 10 papers studied about Herbal plants. Crataegus pinnatifida Bunge, Salvia miltiorrhiza Bunge, Alisma orientale(Sam.) Juz. and so forth were relatively studied much. Conclusion : This study produced an overview of worldwide antihyperlipidemic plants. This result may provide a valuable information for development of Korean herbal medicine against hyperlipidemia in the future.

개항(開港) 초기(初期) 목포항(木浦港)의 일본인(日本人)과 해상(海上)네트워크

崔誠桓 ( Choi Sung-hwan ) 인하대학교 한국학연구소 2012 한국학연구 Vol.0 No.26

1897년 開港 이후 목포항 일본인 사회를 주도한 사람들의 특징과 목포권 海上네트워크를 살펴보았다. 연구범위는 1897년 개항부터 1910년까지개항기 상황에 초점을 맞추었다. 세부 주제와 연구결과를 요약하면 다음과 같다. 첫째, 開港배경으로서 목포의 공간적 특징 관련이다. 개항 이전 역사적 흐름 속에서 발견되는 특징과 개항기 외국인들이 인식한 특징으로 구분해 살펴보았다. 목포는 영산강의 길목이며, 湖南 곡창지대와의 근접성, 부산 및 인천항과의 연결성, 항구도시로서 성장가능성 등 공간적 특징을 지니고 있었다. 둘째, 목포항의 일본인 이주와 주도층 양상이다. 長崎縣과 山口縣 출신자들이 많았다. 특히 山口縣 출신자들은 목포 상권을 장악하고, 주도적 역할을 했다. 개항 초기 목포 상업은 부산의 영향력이 컸다. 대부분 상인들이 부산을 거쳐 목포로 진출한 경우가 많았고, 지속적인 연결고리를 지녔다. 이들은 일본거류민회와 상업회의소의 임원을 맡아 목포에서 영향력을 행사하였다. 또한 일본인 주요 인사들이 지속적으로 목포에 거주하는 비율은 그리 높지 않았다는 특징이 있다. 셋째, 목포항의 해상네트워크 관련이다. 개항을 계기로 汽船이 보급되고 목포 쌀이 이출되는 것과 관련하여 더욱 발전하였다. 목포항은 영산 강과 바닷길을 이용한 해상네트워크를 기반으로 전남물산의 집산지가 되었고, 쌀이 일본과 중국지역으로 이출되면서 국제적인 교류 망을 형성하였다. 사람들의 왕래는 국외는 일본지역이 중심이었고, 국내는 서해안 권에 위치한 인천항이 많았다. 물류는 부산항과의 거래가 많았다. 한편 목포항의 해상네트워크는 개항을 계기로 국제적으로 넓어지고 발전했지만, 쌀을 이출하는 것을 목적으로 개항된 항구였기 때문에 그 범위가 일본과 중국을 벗어나지 못하는 한계점도 나타난다. This study examines the characteristics of Japanese society taking initiative at Mokpo Port after the port opening in 1897 and the marine network in Mokpo area. The range of this research is focused on the port opening in 1897 till 1910, the port opening period. The detailed subject and research results can be summed up as below: First, it is about the spatial characteristics of Mokpo as the open port. It was examined after divided into the characteristics found in the historic flow before the port opening and the characteristics recognized by foreigners during the port opening period. Mokpo is in the corner of Yeongsan-gang. It is characterized by spatial features like closeness to Honam Grain Belt, connectivity to Busan and Incheon Port, and growth potentials as a port city. Second, it is about Japanese' move and social aspects at Mokpo Port. There were many of those who were from Nagasaki or Yamaguchi. Especially, those from Yamaguchi gained commercial supremacy in Mokpo and took the lead in it. In the beginning of the port opening period, industry in Mokpo was greatly influenced by Busan. Most merchants passed through Busan and entered Mokpo, and there was constant linkage in it. They exhibited influence in Mokpo as the board members of the Japanese Residents Committee or the Chamber of Commerce. Another characteristic is that there were few Japanese chief figures who stayed in Mokpo for a long period. Third, it is about the marine network in Mokpo Port. With port opening as a start, steamships were induced, and with the exportation of Mokpo rice, it was even more developed. Mokpo Port became the trading center of Jeonnam's products based on the marine network using Yeongsan-gang and the sea routes. As the rice became exported to Japan or China, an international exchange network was formed. In the outside, Japan was the center of people's traffic, and in the inside, Incheon Port and Gunsan Port located in the West Coast were the center. Meanwhile, the marine network of Mokpo Port was widened and developed internationally with port opening as a start; however, since it was the port opened in order to export rice, the range was inevitably limited to Japan and China.