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Jang, Jihoon,Kim, Jung-Keun,Choi, Jin-Woo,Hwang, Taek-Sung,Jo, Mijung,Kim, Inhye,Cho, Byoung-Ki,Lee, Eunji The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.73
<P>The amphiphilic block codendrimer self-assembled into supramolecular vesicles with a bilayer membrane in both hydrophilic and hydrophobic solvents. Surface-modified quantum dots (QDs) were successfully entrapped within the wall of vesicles through a simple self-assembly process without any structural disruption.</P> <P>Graphic Abstract</P><P>A Janus amphiphilic codendrimer can lead to the formation of organic–inorganic hybrid hollow capsules by co-assembly with surface-modified quantum dots in both hydrophilic and hydrophobic solvents. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc42213e'> </P>
Pseudo-renal Failure Caused by Urinary Bladder Rupture in Multiple Trauma Patient
( Jihoon Jang ),( Kyoung Hoon Lim ) 대한외상학회 2016 大韓外傷學會誌 Vol.29 No.4
Pseudo-renal failure presents with renal failure characteristics, such as hypercreatininemia and hyperkalemia without a change in glomerular filtration rate or structure of the kidney. Pseudo-renal failure due to trauma is difficult to diagnose, because symptoms are non-specific and other factors may cause hypercreatininemia and hyperkalemia. In a trauma patient, especially one with pelvic injury, the abrupt elevation of potassium, blood urea nitrogen, and creatinine levels without previous medical history is a key feature in the diagnosis of urinary ascites. We report a case of pseudo-renal failure caused by intraperitoneal bladder rupture in a multiple trauma patient. [ J Trauma Inj 2016; 29: 191-194 ]
Forearm Replantation for a Patient Presented with Major Amputation Injury: A Case Report
( Jihoon Jang ),( Kyoung Hoon Lim ),( Joon-woo Kim ),( Hyung-kee Kim ) 대한외상학회 2016 大韓外傷學會誌 Vol.29 No.4
With the development of safety measures for employees who work with dangerous machinery, the frequency of amputation injuries has been decreasing with resultant decrease in replantation procedures. However, in some patients with major amputation injury, replantation is still necessary for the preservation of limb and it s function. The replantation of the upper extremity (UE) is a complex and technically demanding surgical procedure. For the successful replantation of UE, the type of injury, reconstruction sequence, ischemic time, and other combined injury of patient should be considered. We report a case of major amputation of UE by guillotine-type injury and discuss the treatment process of this patient. [ J Trauma Inj 2016; 29: 187-190 ]
Oxidized DJ-1 Levels in Urine Samples as a Putative Biomarker for Parkinson's Disease
Jang, Jihoon,Jeong, Soyeon,Lee, Sung Ik,Seol, Wongi,Seo, Hyemyung,Son, Ilhong,Ho, Dong Hwan Hindawi 2018 Parkinson’s disease Vol.2018 No.-
<P>Parkinson's disease (PD) is the second most common neurodegenerative disease. Oxidative stress is the most critical risk factor for neurodegenerative diseases, including Alzheimer's disease (AD) and Huntington's disease (HD). Numerous reports have demonstrated that oxidative stress aggravates cytotoxicity in dopaminergic neurons and accelerates the formation of protein inclusions. In addition, oxidative stress, such as 4-hydroxynonenal (HNE), oxidized protein, and dopamine quinone, are related to PD progression. <I>DJ-1</I> is a PD-causative gene, and it plays a pivotal role as a sensor and eliminator of oxidative stress. Several studies have shown that oxidized DJ-1 (OxiDJ-1) formation is induced by oxidative stress. Hence, previous studies suggest that oxidized DJ-1 could be a biomarker for PD. We previously reported higher DJ-1 levels in Korean male PD patient urine exosomes than male non-PD controls. We speculate that OxiDJ-1 levels in PD patient urine might be higher than that in non-PD controls. In this study, we established an ELISA for OxiDJ-1 using recombinant DJ-1 treated with H<SUB>2</SUB>O<SUB>2</SUB>. Using Western blot assay and ELISA, we confirmed an increase of OxiDJ-1 from HEK293T cells treated with H<SUB>2</SUB>O<SUB>2</SUB>. Using our ELISA, we observed significantly higher, 2-fold, OxiDJ-1 levels in the urine of Korean PD patients than in non-PD controls.</P>
Jang, Jihoon,Oh, Hakjin,Nam, Daleum,Seol, Wongi,Seo, Mi Kyoung,Park, Sung Woo,Kim, Hyung Gun,Seo, Hyemyung,Son, Ilhong,Ho, Dong Hwan ZOOLOGICAL SOCIETY OF KOREA 2018 ANIMAL CELLS AND SYSTEMS Vol.22 No.5
<P><B>ABSTRACT</B></P><P>Leucine-rich repeat kinase 2 (LRRK2) is involved in Parkinson’s disease (PD) pathology. A previous study showed that rotenone treatment induced apoptosis, mitochondrial damage, and nucleolar disruption via up-regulated LRRK2 kinase activity, and these effects were rescued by an LRRK2 kinase inhibitor. Heat-shock protein 70 (Hsp70) is an anti-oxidative stress chaperone, and overexpression of Hsp70 enhanced tolerance to rotenone. Nucleolin (NCL) is a component of the nucleolus; overexpression of NCL reduced cellular vulnerability to rotenone. Thus, we hypothesized that rotenone-induced LRRK2 activity would promote changes in neuronal Hsp70 and NCL expressions. Moreover, LRRK2 G2019S, the most prevalent LRRK2 pathogenic mutant with increased kinase activity, could induce changes in Hsp70 and NCL expression. Rotenone treatment of differentiated SH-SY5Y (dSY5Y) cells increased LRKK2 levels and kinase activity, including phospho-S935-LRRK2, phospho-S1292-LRRK2, and the phospho-moesin/moesin ratio, in a dose-dependent manner. Neuronal toxicity and the elevation of cleaved poly (ADP-ribose) polymerase, NCL, and Hsp70 were increased by rotenone. To validate the induction of NCL and Hsp70 expression in response to rotenone, cycloheximide (CHX), a protein synthesis blocker, was administered with rotenone. Post-rotenone increased NCL and Hsp70 expression was repressed by CHX; whereas, rotenone-induced kinase activity and apoptotic toxicity remained unchanged. Transient expression of G2019S in dSY5Y increased the NCL and Hsp70 levels, while administration of a kinase inhibitor diminished these changes. Similar results were observed in rat primary neurons after rotenone treatment or G2019S transfection. Brains from G2019S-transgenic mice also showed increased NCL and Hsp70 levels. Accordingly, LRRK2 kinase inhibition might prevent oxidative stress-mediated PD progression.</P><P><B>Abbreviations:</B> 6-OHDA: 6-hydroxydopamine; CHX: cycloheximide; dSY5Y: differentiated SH-SY5Y; g2019S tg: g2019S transgenic mouse; GSK/A-KI: GSK2578215A kinase inhibitor; HSP70: heat shock protein 70; LDH: lactose dehydrogenase; LRRK2: leucine rich-repeat kinase 2; MPTP: 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine; myc-GS LRRK2: myc-tagged g2019S LRRK2; NCL: nucleolin; PARP: poly(ADP-ribose) polymerase; PD: Parkinson’s disease; PINK1: PTEN-induced putative kinase 1; pmoesin: phosphorylated moesin at t558; ROS: reactive oxygen species</P>
나노 임프린트 공정을 이용한 Ag 나노로드 제조 및 비정질 박막 태양전지 적용
장지훈(Jang, JiHoon),한강수(Han, Kang-Soo),조준식(Cho, Jun-Sik),이헌(Lee, Heon),박해웅(Park, Hai Woong),송진수(Song, Jinsoo),이정철(Lee, Jeong Chul) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
비정질 실리콘 태양전지의 효율을 증가하기 위하여 많이 사용되는 방법 중 하나는 입사되는 빛의 산란을 증가하여 태양전지의 광흡수를 증가시키는 방법이다. 이를 위하여 양극전극으로 사용되는 TCO층의 일정한 패턴 처리를 통하여 광산란을 증가시키는 방법이 사용되고 있다. 본 연구에서는 나노 임프린트 리소그래피방법을 사용하여 Ag 나노로드를 증착한 기판을 제조하고 이를 비정질 실리콘 태양전지에 적용하였다. 실험결과, 그림과 같이 높이와 너비가 300nm 정도로 일정한 패턴의 Ag 나노로드를 제조하였다. 또한, 그 위에 증착된 Si 박막의 경우, 나노로드 전체를 감싸는 돔 형태로 성장하였다. 이와 같은 나노로드 위에 substrate n-i-p 구조의 비정질 박막 태양전지를 증착하고 그 특성변화를 분석하고자 하였다.
이형질의 다중 에이전트 환경에서의 에이전트 동적 구동 기법
장지훈(Jihoon Jang),강기영(Kiyoung Kang),최중민(Joongmin Choi) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅱ
최근 다중 에이전트에 대한 연구가 활발히 진행되고 있다. 특히 이질적이고 분산된 컴퓨팅 환경에 효율적이며 적응성이 향상된 여러 가지 형태의 다중 에이전트가 개발되고 있다. 하지만 아직 이질적인 에이전트의 동적구동을 통한 효율 향상과 유연성에 대한 연구는 초보단계이다. 본 논문에서는 자바로 된 다중 에이전트 기반 구조에서 서로 각기 다른 컴퓨터 언어로 만들어진 에이전트가 분산된 환경에서 상호 협력을 통해 작업을 수행하기 위해서 사용자나 다른 에이전트의 요청으로 동적으로 수행될 수 있는 기술을 설계하고 구현하였다. 또한 서로 다른 에이전트간의 협력을 가능하게 하는 통신기능을 다중 에이전트 기반기술에 적용함으로써 사용자의 요구에 더욱더 능동적으로 대처하고, 다양한 환경 변화에 강한 적응성과 개선된 협동능력을 제공하도록 구현하였다.
장지훈(Jihoon Jang),한가람(Karam Han),유근실(Geun Sil Yu),이욱륜(Wook Ryun Lee),임현수(HyeonSoo Lim),박호영(Ho Young Park) 한국연소학회 2019 한국연소학회지 Vol.24 No.2
Devolatilization behavior of pulverized coal in a drop tube furnace (DTF) has been calculated with the measured gas temperature and velocity. The particle temperature and velocity were calculated from the energy and momentum equations of particle by using the fourth order Runge-Kutta method. The volatile evolved from the particle along with the reactor tube was also calculated varying the wall temperature of reaction tube as well as the particle diameter. The optimal kinetic parameters of subbituminous coal were obtained from the volatile evolution data of the devolatilization experiment in the DTF by error minimization.