SHS 공정으로 합성된 TiC 계 cermet 미세구조에 미치는 바인더 금속의 영향

박민우,한유동,전재호,김명진 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.11

Microstructural evolution of Ti-C-metal binder powder mixtures during SHS process was investigated by combustion-wave arresting technique. Al, Fe, Co, Ni and Cu were selected as binder metals of TiC-based cermet. The characteristics of SHS reaction occurred in different mode, depending on the binder metals. SHS reaction resulted in the three distinct regions; such as unreacted, partially reacted, and fully reacted parts. The intermediate phases of Ti and the metal binder were formed in the partially reacted region. The resulting cermet in the fully reacted region consisted of round shaped carbide particles and metal binder phase.

VR 무빙워커

박민우,소병민,김유나희,양세동,강현식,김가인 한국조명·전기설비학회 2022 한국조명·전기설비학회 학술대회논문집 Vol.2022 No.11

양측 돌발성 난청을 동반한 재발성 다발성 연골염 1예

박민우,김보형,임대준,강성호 대한이비인후과학회 2014 대한이비인후과학회지 두경부외과학 Vol.57 No.4

Relapsing polychondritis is a relatively rare systemic disease of unknown etiology. The disease is considered as an autoimmune disorder and characterized by episodic recurrent inflammation of cartilage and connective tissue, most often of the ears, nose, eyes, joints, respiratory tract, cardiovascular system and audiovestibular system. Treatment plans involve suppression of the immune system with corticosteroid. However, steroid therapy is associated with a number of adverse effects, and non-steroidal anti-inflammatory agents and immunosuppressive agents are helpful in treating the disease. Authors have recently experienced a case of relapsing polychondritis in a 24-year-old man who had both auricular chondritis and bilateral sudden hearing loss with vertigo. The patient showed a significant hearing improvement with the treatment using steroid and immunosuppressive agents. We report this case with a review of the literature. Korean J Otorhinolaryngol-Head Neck Surg 2014;57(4):279-82

크라이슬러와 제너럴모터스의 도산사건이 우리나라의 도산제도에 주는 시사점 - 시스템리스크와 도산절차 -

박민우 한국상사법학회 2012 商事法硏究 Vol.30 No.4

Chrysler and General Motors entered and exited bankruptcy within two months, making it one of the fastest major industrial bankruptcies in the history. They entered as companies widely thought to be ripe for liquidation if left on theirs own, obtained massive funding from the United States Government, and exited via pseudo-sale of their main assets to two new government-funded entities. Both debtors were provided with substantial government financing from U.S., and both cases involved a quick sale of the “good” parts of the debtors’ operating assets, while the remainder was left behind for liquidation. To help stabilize the U.S. automotive industry and avoid disruptions that would pose systemic risk to nation’s economy, in December 2008 the Treasury Department established the Automotive Industry Financing Program under Troubled Asset Relief Program. In both cases, U.S. government agreed to provided the automakers with DIP financing on condition that a sale of each debtor's asset occur on an expedited basis so as to preserve the value of the business, restore consumer confidence, and avoid the costs of a lengthy chapter 11 process which is systemic risk. Systemic risk is the risk of collapse of an entire financial system or entire market, as opposed to risk associated with any one individual entity, group or component of a system. It can be defined as “financial system instability,potentially catastrophic, caused or exacerbated by idiosyncratic events or conditions in financial intermediaries”. It refers to the risks imposed by bank-run and interconnectedness in a system or market, where the failure of a single entity or cluster of entities can cause a cascading failure, which could potentially bankrupt or bring down the entire system or market. Unlike the assistance of U.S. government to motor companies through the bankruptcy process, Korean government did not involved in a Ssangyong Motor bankruptcy case because Ssangyong Motor’s portion of Korean economy was so small that it could not make any threat of systemic risk. However, if Ssangyong Motor had been a big company like General Motors, the Korean government would have also given financial assistance via process of Corporate Restructuring Promotion Act not Debtor rehabilitation and bankruptcy act. Because Debtor rehabilitation and bankruptcy act does not have elements that make process fast to prevent causing the systemic risk such as automatic stay, DIP financing and prepackaged plan. Besides, the problem is that Corporate Restructuring Promotion Act is not permanent but temporary act. The Korea Ministry of Justice has proposed the change of Debtor rehabilitation and bankruptcy act including automatic stay. In addition to the proposal Debtor rehabilitation and bankruptcy act, I strongly recommend to add DIP financing and prepackaged plan on the proposal to prepare the non-financial company collapse that can make systemic risk.

탁월한 물리화학적 내구성 및 전기화학적 특성을 가진 폴리 아릴렌 피페리디늄(PAP) 음이온교환막과 상승 효과를 위한 GO기반 무기물 충진제 적용 및 특성 분석

박민우,김애란,김범호,유동진 한국에너지학회 2022 한국에너지공학회 학술발표회 Vol.2022 No.10

제56차 춘계학술대회 : 일반포스터 ; 수인성 두드러기(Aquagenic Urticaria) 1예

박민우,김영진,김상석,이종주 대한피부과학회 2004 초록집 Vol.42 No.10

Comparison of Carcass and Sensory Traits and Free Amino Acid Contents among Quality Grades in Loin and Rump of Korean Cattle Steer

박민우,조철훈,김현주,이현정,김현진,고종열,백명기 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.11

This study was performed to compare carcass traits, sensory characteristics, physiochemical composition, and contents of nucleotides, collagen, and free amino acids among quality grades (QG) and to understand the association between QG and above parameters in loin and rump of Korean cattle steer. Loin and rump samples were obtained from 48 Korean cattle steers with each of four QG (QG 1++, 1+, 1, and 2; average 32 months of age). Carcass weight and marbling score (MS) were highest in QG 1++, whereas texture score measured by a meat grader was highest in QG 2. A correlation analysis revealed that MS (r = 0.98; p<0.01) and fat content (r = 0.73; p<0.01) had strong positive correlations with QG and that texture had a strong negative correlation (r = –0.78) with QG. Fat content in loin was highest but protein and moisture contents were lowest in QG 1++. Our results confirmed that a major determinant of QG is the MS; thus, intramuscular fat content. The International Commission on Illumination L*, a*, and b* values in loin were highest in QG 1++. Numeric values of shear force in loin were lowest in QG 1++, whereas those of tenderness, juiciness, and overall acceptability tended to be highest in QG 1++ without statistical significance. QG was strongly correlated with juiciness (r = 0.81; p<0.01) and overall acceptability (r = 0.87; p<0.001). All sensory characteristics were higher (p<0.05) in loin than those in rump. Adenosine-5’-monophosphate (AMP) and inosine-5’-monophosphate (IMP) contents in both loin and rump did not differ among QGs. No nucleotide (AMP, IMP, inosine, hypoxanthine) was correlated with any of the sensory traits. Total, soluble, and insoluble collagen contents in loin were higher in QG 1++ than those in QG 1. All three collagens had lower content in loin than that in rump. All three collagens were positively correlated with tenderness, juiciness, and overall acceptability. Glutamic acid content did not significantly differ among the four QGs in either loin or rump. In conclusion, it is confirmed that QG is associated with sensory traits but nucleotide contents in beef may not be a major factor determining meat palatability in the present study.

수온 및 염분농도에 따른 북방전복, Haliotis discus hannai (Ino, 1952) 의 생존율, 탈락율 및 발의 조직학적 변화

박민우,김혜진,김병학,손맹현,전미애,이정식 한국패류학회 2013 The Korean Journal of Malacology Vol.29 No.4

This study investigated survival, falling and structural changes of foot in Haliotis discus hannai with various water temperature and salinity. Experimental conditions were composed of control with 20℃/33.5 psu, higher temperature group with 23, 26, 29 and 32℃, lower temperature group with 3, 6, 9 and 12℃, and different salinities group with 33.5, 26.8, 20.1, 13.4, 6.7 and 3.3 psu. Experimental period was 7 days. Survival and falling rate of the abalone exposed to 7 days at control and experimental condition of 12℃ and 23℃/33.5 psu were 100% and 0%, respectively. Mortality and falling rate of the abalone exposed to the different temperature and salinity were dose dependent by experimental condition. Histopathological changes in epithelial and muscular layer of foot showed more obvious with experimental condition of salinity decrease than different temperature condition. 본 연구는 수온과 염분농도의 변화에 따른 Haliotis discushannai의 생존, 탈락 및 발의 구조적 변화를 이해하고자 하였다. 노출조건은 대조구 (20℃/33.5 psu), 고수온 4조건 (23,26, 29, 32℃), 저수온 4조건 (3, 6, 9, 12℃), 염분농도 6조건(33.5, 26.8, 20.1, 13.4, 6.7, 3.3 psu) 이었다. 실험기간은 7일이었다. 대조구와 12℃ 및 23℃/33.5 psu 조건에 7일간 노출된 북방전복의 생존율과 탈락률은 각각 100%와 0%였다. 다양한 수온 및 염분농도 조건에 노출된 북방전복의 사망률과 탈락률은 농도의존적 이었다. 북방전복 발의 상피층과 근육층의조직학적 변화는 수온의 변화 보다 염분농도의 감소 조건에서더욱 뚜렷하였다.

국내 넓은띠큰바다뱀에 부착된 착생 만각류 최초보고

박민우,박재진,박일국,김종선,김일훈,박대식 한국양서ㆍ파충류학회 2022 한국양서·파충류학회 학술대회 Vol.2022 No.07

오늘날 만각류는 1,000종 이상 보고되어 있으며, 그 중 일부 만각류는 생활사의 대부분을 해양 척추동물에게 고착하여 생활하는 것으로 보고되었다. 이들의 종 다양도 만큼이나 분포 양상도 다양하여, 이들은 착생생물로서 숙주생물의 행동양상이나 생태를 파악하는데 중요한 자료가 될 수 있다. 그러나 국내에서는 아직까지 만각류와 해양 척추동물 간의 상호작용에 관하여 연구가 미흡하기 때문에 추가적인 조사가 필요하다. 본 연구에서는 국내 해역에서 포 획된 넓은띠큰바다뱀(Laticauda semifasciata)에 부착되어있던 만각류를 보고하고자 한다. 2016 년 9월 7일 제주 우도 인근 해역(33.56°N, 127.02°E)에서 포획된 넓은띠큰바다뱀 1개체에는 총 22개체의 만각류가 부착되어 있었다. 본 연구에서 발견한 만각류는 두상부와 병부가 구별 되는 특징, 두상부에 존재하는 작은 5개의 각판, 그리고 Y 자형의 순판에 근거해 동정한 결 과, 주머니조개삿갓(Conchoderma virgatum)으로 동정하였다. 전 세계 기준으로, 오늘날까지 넓은띠큰바다뱀에 부착하는 것으로 보고된 만각류의 종류는 총 2종으로(C. virgatum, Platylepas ophiophilus), 그 중 주머니조개삿갓은 국외에서는 종종 해양생물에게 부착되어 발 견되었었다. 그러나 국내에서 해양생물에 부착되어 발견된 사례는 이번 보고가 최초다. 이러 한 조머니조개삿갓을 비롯한 만각류의 부착은 바다뱀의 행동에 제약을 가하거나 탈피부전을 야기하며, 피부 조직을 통해 2차 감염을 일으킬 수 있다. 때문에 본 연구에서 보고된 주머니 조개삿갓을 포함한 만각류와 해양파충류의 상호작용에 관한 추가적인 연구를 통하여 국내 해 양파충류의 생태 연구에 기여할 수 있을 것으로 판단된다.

한국 진도에서 채집된 북방전복, Haliotis discus hannai의 생식주기

박민우,김혜진,김병학,손맹현,최지성,이정식 한국패류학회 2014 The Korean Journal of Malacology Vol.30 No.3

This study histologically describes the gonadal development and reproductive cycle of the abalone, Haliotis discus hannai inhabiting Jindo on the southern seashores of Korea. Gonads displayed histologically definitive seasonal changes. The female ratio (F/F + M) was 57% (n = 154/271). The gonad index (GI) of both males and females was the highest (3.3 and 3.9) in June and was the lowest (1.1 and 1.1) in December. The condition index (CI) and meat weight rate (MWR) were highest in May and lowest in October. The pattern of changes in the GI, CI and MWR were similar to the pattern of seasonal changes in gonadal tissues. The reproductive cycle was divided into an inactive stage (November–December), early active stage (January–March), late active stage (March–April), ripe stage (May–June) and spent and degenerative stage (July–October). The main spawning period of Haliotis discus hannai was July to August at Jindo in 2013. 본 연구에서는 한국 남해안 진도에 서식하는 북방전복의 생식소 발달과 생식주기를 조직학적으로 기재하였다. 생식소는조직학적으로 계절적인 변화를 보였다. 암컷의 비율은 57% (n = 154 / 271) 로 조사되었다. 생식소지수는 암, 수 모두 6월에최고값 (3.3, 3.9) 을 보였으며, 12월에 최저값 (1.1, 1.1) 을나타냈다. 비만도와 육중량비는 모두 5월에 최고값을 보였으며, 10월에 최저값을 나타냈다. 생식소지수, 비만도 및 육중량비의 변화는 생식소조직의 계절적 변화와 유사한 양상을 나타냈다. 생식주기는 비활성기 (11월-12월), 초기활성기 (1월-3 월), 후기활성기 (3월-4월), 완숙기 5월-6월), 방출 및 퇴화기(7월-10월) 로 구분할 있었다. 2013년 진도에서 북방전복의주산란기는 7월-8월이었다