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Kim, Daesoo,Yoon, Taeho,Park, Sangjin,Shin, Soyoung,Ryu, Ji Heon,Oh, Seung M. The Electrochemical Society 2014 Journal of the Electrochemical Society Vol.161 No.14
<P>In order to address the role of aluminum dopant in spinel-structured lithium manganese oxide (Li<SUB>1.08</SUB>Mn<SUB>1.84</SUB>Al<SUB>0.08</SUB>O<SUB>3.96</SUB>, Al-doped LMO) electrode, high-temperature (60°C) charge/discharge cycling and storage experiments are carried out. The Al-doped LMO outperforms the un-doped counterpart with respect to capacity fading and Mn dissolution. However, the electrode polarization becomes substantial for the Al-doped LMO after the high-temperature storage. As the resistive component to be responsible for the electrode polarization, Al<SUB>2</SUB>O<SUB>3</SUB> and Al(OH)<SUB>x</SUB>F<SUB>3-x</SUB> are identified on the Al-doped LMO surface from X-ray photoelectron spectroscopy study. It is very likely that the doped Al ions dissolve into the electrolyte during the high-temperature storage but re-deposit as a form of Al<SUB>2</SUB>O<SUB>3</SUB> and Al(OH)<SUB>x</SUB>F<SUB>3-x</SUB> on the LMO surface. Due to a scavenging action of these Al species for hydrogen fluoride, Mn dissolution is suppressed to give an improved cycle and storage performance at elevated temperature.</P>
세마 도트 오락실: 화상회의 플랫폼 게더타운 활용 공동체 놀이를 통한 미술관 전시 경험의 확장
조한결(Hangyeol Jo),류지민(Jimin Ryu),김병준(Byungjoon Kim),오민정(Minjeong Oh),배기현(Kihyeon Bae),배주형(Jhoohyung Bhae),백관협(Kwanhyup Baek),오명석(Myungseok Oh),오태호(Taeho Oh),서용덕(Yongdeok Seo) 한국HCI학회 2022 한국HCI학회 학술대회 Vol.2022 No.2
〈세마 도트 오락실〉은 북서울시립미술관 〈당신의 휴일〉 전시 연계 워크샵으로 진행한 프로젝트이다. 게더타운으로 제작한 온라인 공간 안에서 시민들과 함께 전시 내용을 반영한 공동체 놀이와 전시 연계 공간 탐험을 진행했다. 본 사례를 통해 미술관 전시 프로그램이 메타버스 플랫폼을 활용하여 교육과 해설이 아닌 놀이와 게임을 통해 기억되고 확장될 수 있도록 하는 사례를 제시하고자 한다.
Development of an Autonomous Submersible Fish Cage System
Taeho Kim,Kyu-Serk Hwang,Moo-Hwan Oh,Duck-Jong Jang IEEE 2014 IEEE JOURNAL OF OCEANIC ENGINEERING - Vol.39 No.4
<P>A novel and fully automatic rigid fish cage system has recently been developed for deployment in the waters of Korea. The cage structure has 12 sides, incorporating a steel framework with a diameter and depth of 5.92 and 2.91 m, respectively. Attached to the steel framework is a housing for motor valves controlling variable ballast tanks, eight housings for two air compressors, a main control system, four batteries, a reserve air tank, four high air pressure tanks, 12 variable ballast tanks, and a seawater pump housing. The net of the fish cage is tightened across the frame to minimize volume reduction due to currents. The cage is outfitted with a control station located above the valve housing. With the control system, the buoyancy can be adjusted by utilizing compressed air stored in the four high air pressure tanks. The mechanical components of the ballast systems are operated by automated software that incorporates control and monitoring algorithms. The software initiates control of the ballasting components so the fish cage system can submerge if a preselected sea state occurs. The automatic control station incorporates a wind gauge, wireless communication printed circuit boards (PCBs), and a transmitting antenna. During operation, it monitors the wind speed, so the cage can be submerged before extreme sea states and then surfaced after the weather has passed and the conditions are considered safe. The control station also regulates the flow of air and seawater to and from the variable ballast tanks in response to the surface environmental conditions. Control can also be done remotely by a facility operator. In the development process, in situ tests were conducted to assess the performance of the submersion mechanism and the reliability of the automatic control system with a 1/4 size fish cage of similar construction. During the tests, the vertical position and inclination of the fish cage in the water column were measured. During the tests, the close/open states of the motor valves that control the 12 variable ballast tanks were also assessed during descent and ascent operations. The successful performance of the 1/4 size fish cage during the tests showed promise that such a system could possibly be used on a much larger scale to avoid the rigors of the environment in support of commercial level offshore aquaculture.</P>
Rafael Taeho Han,Han-Byul Kim,Young-Beom Kim,Kyungmin Choi,Gi Yeon Park,Pa Reum Lee,JaeHee Lee,Hye young Kim,Chul-Kyu Park,Youngnam Kang,Seog Bae Oh,Heung Sik Na 대한생리학회-대한약리학회 2018 The Korean Journal of Physiology & Pharmacology Vol.22 No.2
Recent studies have provided several lines of evidence that peripheral administration of oxytocin induces analgesia in human and rodents. However, the exact underlying mechanism of analgesia still remains elusive. In the present study, we aimed to identify which receptor could mediate the analgesic effect of intraperitoneal injection of oxytocin and its cellular mechanisms in thermal pain behavior. We found that oxytocin-induced analgesia could be reversed by d(CH2)5[Tyr(Me)2,Dab5] AVP, a vasopressin-1a (V1a) receptor antagonist, but not by desGly-NH2-d(CH2)5[DTyr2, Thr4]OVT, an oxytocin receptor antagonist. Single cell RT-PCR analysis revealed that V1a receptor, compared to oxytocin, vasopressin-1b and vasopressin-2 receptors, was more profoundly expressed in dorsal root ganglion (DRG) neurons and the expression of V1a receptor was predominant in transient receptor potential vanilloid 1 (TRPV1)-expressing DRG neurons. Fura-2 based calcium imaging experiments showed that capsaicin-induced calcium transient was significantly inhibited by oxytocin and that such inhibition was reversed by V1a receptor antagonist. Additionally, whole cell patch clamp recording demonstrated that oxytocin significantly increased potassium conductance via V1a receptor in DRG neurons. Taken together, our findings suggest that analgesic effects produced by peripheral administration of oxytocin were attributable to the activation of V1a receptor, resulting in reduction of TRPV1 activity and enhancement of potassium conductance in DRG neurons.
Yoon, Taeho,Lee, Taejin,Soon, Jiyong,Jeong, Hyejeong,Jurng, Sunhyung,Ryu, Ji Heon,Oh, Seung M. The Electrochemical Society 2018 Journal of the Electrochemical Society Vol.165 No.5
<P>High voltage positive electrodes for lithium ion batteries have suffered from continuous oxidation of the electrolyte during cycling, which largely offsets the benefits of high energy and power densities. In this work, the electrolyte oxidation and concomitant film deposition/dissolution behaviors were investigated on Pt electrode by using linear sweep voltammetry (LSV), electrochemical quartz crystal microbalance (EQCM), and X-ray photoelectron spectroscopy (XPS). Two characteristics were identified. First, film deposition is relatively unfavorable at higher potentials (>4.7 V vs. Li/Li+) because the oxidation products are mostly gaseous or soluble species. Second, the concentration of inorganic species decreases in the surface film as the potential increases, which is likely dissolved by HF or polar species. The dominance of gaseous or soluble products and the partial dissolution of the surface film, are two characteristics which hamper passivation of the electrode surface, leading to severe electrolyte oxidation at the high potentials. (C) 2018 The Electrochemical Society.</P>