인산 및 수증기 활성화에 의한 대나무 활성탄 제조 및 특성 연구

박정우,리황부,오창호,김승수,Park, Jeong-Woo,Ly, Hoang Vu,Oh, Changho,Kim, Seung-Soo 한국청정기술학회 2019 청정기술 Vol.25 No.2

Bamboo is an evergreen perennial plant, and it is known as one of the most productive and fastest-growing plants in the world. It grows quickly in moderate climates with only moderate water and fertilizer. Traditionally in Asia, bamboo is used for building materials, as a food source, and as versatile raw materials. Bamboo as a biomass feedstock can be transformed to prepare activated carbon using the thermal treatment of pyrolysis. The effect of process variables such as carbonization temperature, activation temperature, activation time, the amount of steam, and the mixing ratio of phosphoric acid and bamboo were systematically investigated to optimize the preparation conditions. Steam activation was proceeded after carbonization with a vapor flow rate of $0.8{\sim}1.8mL-H_2O\;g-char^{-1}\;h^{-1}$ and activation time of 1 ~ 3 h at $700{\sim}900^{\circ}C$. Carbon yield and surface area reached 2.04 ~ 20.59 wt% and $499.17{\sim}1074.04m^2\;g^{-1}$, respectively, with a steam flow rate of $1.4mL-H_2O\;g-char^{-1}\;h^{-1}$ for 2 h. Also, the carbon yield and surface area were 24.67 wt% and $1389.59m^2\;g^{-1}$, respectively, when the bamboo and phosphoric acid were mixed in a 1:1 weight ratio ($700^{\circ}C$, 2 h, $1.4mL-H_2O\;g-char^{-1}\;h^{-1}$). The adsorption of methylene blue into the bamboo activated carbon was studied based on pseudo first order and second order kinetics models. The adsorption kinetics were found to follow the pseudo second order model, which is governed by chemisorption. 대나무는 지구상에 존재하는 식물 중 적절한 기후와 토양조건에서 생산성이 가장 높고, 성장속도가 가장 빠른 다년생 식물로 알려져 있다. 전통적으로 아시아에서 대나무는 음식, 건축 및 다양한 재료로 활용되고 있다. 바이오매스 자원으로 대나무는 열분해과정을 거쳐 활성탄으로 제조될 수 있다. 본 연구에서는 탄화온도, 활성화 온도, 시간, 수증기의 양, 그리고 인산의 양 등을 변화에 따른 최적의 대나무 활성탄 제조 연구를 수행하였다. 대나무 탄화 후 수증기 활성화를 위해 $700{\sim}900^{\circ}C$의 온도, $0.8{\sim}1.8mL-H_2O\;g-char^{-1}\;h^{-1}$ 수증기 유량 범위에서 1 ~ 3 h 동안 활성화를 진행하였다. 수증기 유량을 $1.4mL-H_2O\;g-char^{-1}\;h^{-1}$으로 2 h 동안 실험한 결과 활성탄 수율과 비표면적은 각각 2.04 ~ 20.59 wt%, $499.17{\sim}1074.04m^2\;g^{-1}$의 값이 나왔다. 대나무와 인산의 질량비를 1:1로 혼합한 후 $700^{\circ}C$에서 유량 $1.4mL-H_2O\;g-char^{-1}\;h^{-1}$ 속도로 2 h 동안 활성화를 진행한 결과 활성탄 수율과 비표면적은 각각 24.67 wt%, $1389.59m^2\;g^{-1}$의 값이 나타냈다. 제조된 대나무 활성탄을 대상으로 메틸렌블루 흡착 실험을 통해 유사 1차, 2차 속도식 모델을 적용하였으며, 화학적 흡착을 의미하는 유사 2차 속도식에 따랐다.

한방 치료와 코어 운동을 병행한 퇴행성 슬관절염 환자 1례에 대한 증례보고

박정우,정수현,Park, Jung-Woo,Jeong, Su-Hyeon 척추신경추나의학회 2013 척추신경추나의학회지 Vol.8 No.2

Objectives : The objective of this study is to report the effect of Traditional Korean medical therapy and core exercise on osteoarthritis of knee joint by observing a clinical case study. Methods : Patient with a diagnosis of osteoarthritis of knee joint, was treated by acupuncture, herb medicine, physical theraphy and core exercise. Results : After treatment, Visual Analogue Scale(VAS), Korean version of the Western Ontario and McMaster Universities(KWOMAC), Pain Rating Score(PRS) were reduced from 5 to 2, from 25 to 16, from 55 to 27, and CENTAUR test results were improved. Conclusions : This study showed that Traditional Korean medical therapy and core exercise has meaningful effect on osteoarthritis of knee joint, and more researches should be followed.

기술표준동향 - ISO 26000 사회적 책임 (Social Responsibility) 국제표준동향

박정우,Park, Jeong-Woo 기술표준원 2009 기술표준 Vol.89 No.-

국내분리 Aujeszky's disease virus의 실험적 감염 자돈에 대한 바이러스학적 연구

박정우,전무형,안수환,Park, Jeong-woo,Jun, Moo-hyung,An, Soo-hwan 대한수의학회 1990 大韓獸醫學會誌 Vol.30 No.2

To investigate the etiology, pathogenicity and virological properties of NYJ-1-87 strain of Aujeszky's disease virus (ADV) that was isolated from the diseased piglet in Korea, the virus at $10^{6.0}TCID_{50}/0.1ml$ was inoculated intranasally and subcutaneously into 30 to 35 days-old piglets. Results obtained through the experiments were summarized as follows. 1. Ten of the infected piglets were clinically observed for 15 days. On the 2nd day post-inoculation(pi), the signs of pyrexia, anorexia and convulsion were noted. On the 4th to 7th days pi, nervous signs of incoordination and intermittent spasm were shown in the most of piglets, and one out of 5 piglets infected intranasally was died with severe nervous signs at the 7th day pi. The signs became relieved on the 8th day pi and all of remainder were completely recovered on the 13th to 14th days pi. 2. In hematological study, prominent decrease in the number of total leukocyte and lymphocyte was shown in the ADV-infected piglets on the 6th day pi. On the 8th day pi, the cell numbers were slightly increased and returned to normal level on the 10th day pi. 3. Viral excretion of the ADV-inoculated piglets was examined by swabbing of nasal and oral cavities, and rectal feces. During the periods of the 3rd to 11th days pi, the virus was excreted intermittently from nasal and oral cavities, and rectal feces. The nasal excretions were shown the highest virus concentration of $10^{5.2}TCID_{50}/0.1ml$ at the 5th day pi. 4. Recovery of the inoculated virus from various organs of the piglets that were died or experimentally slaughtered was attempted, and the virus was isolated from the tissues of brain and tonsil by the cultured cell-inoculation method. The highest recovery rate was noted in the tonsil. By indirect immunofluorescence antibody assay using ADV-monoclonal antibody, the viral antigens were detected in tissues of spleen and liver as well as brain and tonsil on the 7th to 9th days pi. The virus was not isolated from blood and the tissues of lung and kidney throughout the experiments. 5. Titers of virus neutralizing antibody in the piglets experimentally infected with ADV became increased after the 6th to 9th days pi in both of intranasal and subcutaneous inoculation showing the highest titers of 64 to 128 on the 29th day pi. When the antibody levels were measured by radial immunodiffusion enzyme assay, the reactive diameter was enlarged to be positive after the 4th to 6th days pi in both of intranasal and subcutaneous inoculation showing the largest diameter of 13 to 14mm on the 29th day pi.

바위 자고새의 흑두병 발생예

박정우,전무형,조성환,조우영,Park, Jeong-woo,Jun, Moo-hyung,Cho, Sung-whan,Cho, Woo-young 대한수의학회 1992 大韓獸醫學會誌 Vol.32 No.2

The diseased Chuckar partridges that were raised at the wild bird-raising farms located in Ockchun, Chungbuk province, were submitted for diagnosis in the laboratory in July. 1990. The diseased partridges aged 3~4 weeks old were shown clinical signs such as anorexia, depression, white-colored or transparent-watery diarrhea and dropping of the head and wings. At necropsy, major gross lesions were found in the livers, ceca and lungs. Histopathologically, numerous histomonads were observed in the necrotic tissues of the livers and ceca. In the cecal specimens, it was found that the ameboid histomonads have flagellum and the size of 10~20 micrometer. The case was confirmed as histomoniasis due to the infection of Histomonas meleagridis.

전염성 췌장 괴저 바이러스의 어류세포에의 감염에 미치는 리소솜 친화성 약염기의 영향

박정우,하영칠,정가진 ( Jeong Woo Park,Yung Chil Hah,GajIn Jeong ) 생화학분자생물학회 1990 BMB Reports Vol.23 No.4

We investigated the effect of ammonium chloride, which is known to affect lysosome-mediated viral internalization, on the infectious of fish cells, CHSE-214, with Infectious Pancreatic Necrosis Virus (IPNV). Progeny production of IPNV was delayed 6 to 8 hours in IPNV infected CHSE-214 cells by the addition of NH₄C1 at the final concentration of 20 mM. The multiplication of IPNV, however, was no longer inhibited when NH₄C1 was present only for the first 4 hours after viral infection. Thus the inhibitory effect of NH₄C1 seems to be on some other steps but internalization. For the inhibitory effect of NH₄C1, time of addition is not very important, but the length of treatment is rather critical. Ammonium chloride attenuated the synthesis of almost all the proteins in IPNV-infected CHSE-214 cells. Thus the primary effect of NH₄C1 on virus-infected host cells is to inhibit the synthesis of proteins resulting in the delay of IPNV growth. Therefore, we conclude that IPNV penetration into CHSE-214 cells does not require the low-pH dependent activity of lysosome.

진행성 위암에서 종양 맥관형성이 예후인자로서의 가치를 가지는가?

박정우(Jeong-Woo Park),이민효(Min-Hyo Lee),주정일(Jeong-Il Joo),주영태(Young-Tae Ju),정치영(Chi-Young Jeong),하우송(Woo-Song Ha),박순태(Soon-Tae Park),최상경(Sang-Kyung Choi),홍순찬(Soon-Chan Hong),권수인(Soo-In Kwon),이영준(Young-Jo 대한외과학회 1999 Annals of Surgical Treatment and Research(ASRT) Vol.57 No.3

IHNV (Infectious Hematopoietic Necrosis Virus): 과거, 현재, 그리고 미래

박정우 ( Jeong Woo Park ),조미영 ( Miyoung Cho ),이언화 ( Unn Hwa Lee ),최혜승 ( Hye Sung Choi ) 한국수산과학회 2021 한국수산과학회지 Vol.54 No.5

A global increase in fish consumption has led to a rapid expansion of aquaculture production, which has been linked to enhancing the spread of infectious diseases. Viral diseases can cause high mortality in many cultured fish species, posing a serious threat to the aquaculture industry. Infectious hematopoietic necrosis virus (IHNV) is one of the primary threats to aquacultured salmonid species, causing huge economic losses. Since the first report in cultured sockeye salmon Oncorhynchus nerka during the 1950s in North America, IHNV has spread to other regions, including Europe, Asia, South America, and Africa by transportation of infected fish and eggs, causing disease and increasing mortality in a wide variety of salmonid species. Here, we review existing information relevant to IHNV: its phylogenetic characteristics, origin, infection history, virulence determinants, susceptible hosts, vectors, and vaccine development. This review also addresses a possible cross-species transmission of IHNV to a new host, olive flounder Paralichthys olivaceus, a cultured fish of economic importance in East Asian countries.

Slocum 수중 글라이더의 유영 받음각에 대한 전산유동해석 및 항력계수 연구

박정우(Jeong-Woo Park),이정우(Jung-Woo Lee),최영호(Young-Ho Choi),서갑호(Kap-Ho Seo),서진호(Jin-Ho Suh),박종진(Jong-Jin Park) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.5

An underwater glider makes it easy to explore a wide area with low power. However, an underwater glider is difficult to use for rapid collection, because the surfacing location cannot be predicted after a dive. Thus, simulation research is needed to predict the swimming path. In this paper, based on research, a linearized equation is derived for the drag coefficient at each angle of attack by assuming the boundary conditions for the Slocum underwater glider and performing a computational flow analysis.

프리필용 체크밸브의 유압진동 특성에 관한 연구

박정우(Jeong Woo Park),한성민(Sung-Min Han),이후승(Hu Seung Lee),윤소남(So-Nam Yun) 유공압건설기계학회 2021 드라이브·컨트롤 Vol.18 No.3

A rear axle steering (RAS) system is attached to the rear of medium and large commercial vehicles that transport large cargo. The existing RAS systems are driven by electro-hydraulic actuator (EHA), and most commercialized EHAs consist of electric motors, hydraulic pumps, relief valves, prefill valves and cylinders. The prefill valve required for such EHAs is a type of check valve with extremely low cracking pressure that should not allow RAS to have noise or vibration, and the prefill valve prevents system negative pressure as well as unstable operation. Most papers on this topic rely on experiments to predict valve performance, and theoretically detailed modeling of valves or pipelines is performed, but it is very rare to evaluate hydraulic vibration characteristics by analysing everything from hydraulic pumps to valves comprehensively. In this study, we proposed an experimental circuit that can predict the performance of the prefill valve. The study also analysed the pressure-flow pulsation that is transmitted to the valve through the pipeline, and how the transmitted pressure-flow pulsation affects the valve vibration.