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EEG and EMG recording system for sleep study with a freely moving rat
Youjin Lee,Yena Lee,Seoyoung Hwang,Hee Soo Jeong,Yunjin Kim,Yunbin Lee,Jihoo Lee,Seoyeon Park,Sang Beom Jun 한국실험동물학회 2021 한국실험동물학회 학술발표대회 논문집 Vol.2021 No.7
Sleep is known to play an important role in cognitive functions as well as in physical recovery. Especially, high-quality sleep is closely associated with smooth sleep cycles between NREM (non-rapid eye movement) and REM (rapid eye movement) sleep. It is well known that both sleep stages show clear distinction in electroencephalogram (EEG) and electromyogram (EMG) signals. Therefore, as a first step for sleep study with rodents, a sleep monitoring system must be established for stable measurement of EEG and EMG. There are two challenges for the setup. First, animals should be able to freely move without interruption of EEG or EMG recording cable, so that their natural behavior and sleep can occur. Second, long-term EEG and EMG should be recorded stably. Also, the movements of animals can cause a cable tension and moving artifacts. The movement-related artifacts can interfere with judgment of sleep stages. Also, rodent gnawing of the recording cable frequently leads to early termination of sleep study. In this study, in order to overcome these problems, acrylic cages were developed for sleep monitoring which can minimize the interruption of cables and the artifacts. Principle of lever mechanics is applied to rotational cover of the cage, and it rotates vertically in synchronization with rat’s movement. When the rat stand up, the cage cover opens up to prevent the cable from loosening. Therefore, cable tension can be stably maintained, allowing the rat to move freely without causing artifact. As a result, long-term EEG and EMG recordings are successful performed, and specific characteristics of each sleep stages can be extracted due to the high-quality recorded signals. We expected that the developed sleep monitoring setup can be applied to various long-term in vivo experiments with rats.
Kinematic and Jacobian Analysis of a Parallel-structured Haptic Interface for Laparoscopy Simulation
Yunjin Gu,SungChoon Lee,Hoeryong Jung,Doo Yong Lee 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper reports a kinematic and Jacobian analysis of a haptic interface to simulate laparoscopic surgery. The haptic interface consists of a cylindrically-shaped moving platform and a dummy tool link. The moving platform, which determines the direction of the dummy tool, is fixed at the center and has 2 degree-of-freedom of pitch and yaw. The dummy tool has 3 degree-of-freedom which are translational and rotational movements and end effect operation. Direct kinematics of the haptic interface cannot be computed by using Denavit-Hartenberg model because two parallel links are connected with the moving platform. The developed method to solve the kinematics is deciding the direction vector of the dummy tool link. Six vectors are given to links and the relationship of the vectors is used to decide the direction of the dummy tool link. Finally a closed-form kinematics of the haptic interface is obtained by using the information of the vectors. Derivative of the closed-form kinematics can be utilized as Jacobian. Every components of Jacobian matrix also can be obtained as a closed-form expression. A virtual model of the haptic interface is used to verify the analytic result.
Yunjin Lee,Baek-Lok Oh,Hyeong Gon Yu,Sang Woong Youn,Se Joon Woo 대한안과학회 2021 Korean Journal of Ophthalmology Vol.35 No.1
Purpose: To describe the clinical characteristics and treatment outcomes of uveitis in patients with psoriasis in Korea. Methods: The medical records of 20 patients (27 eyes) with psoriatic uveitis in two tertiary hospitals were retrospectivelyreviewed. We analyzed data about patient demographics, uveitis types, laterality, onset of disease, human leukocyte antigen(HLA) types, intraocular pressure, visual acuity, comorbidities, and medical treatments and outcomes for uveitis and psoriasis. Results: The cohort comprised 11 males and nine females (age of onset, 50.1 ± 13.2 years) and the mean follow-up periodwas 3.9 ± 4.0 years. Types of uveitis included anterior (85%), intermediate (10%), and panuveitis (5%). A total of 13 (65%)cases presented with unilateral involvement and 12 out of 18 patients (66.7%) were positive for HLA-B27. The average intraocularpressure of affected eyes was 11.6 ± 3.6 at the first visit and 13.8 ± 3.6 mmHg at the final visit. The average logarithmof the minimum angle of resolution visual acuity of affected eyes at the initial examination was 0.16 ± 0.52 and 0.27 ± 0.71 atthe last examination. Most common comorbidity (13 patients, 65%) was psoriatic arthritis (PsA). All cases underwent topicalcorticosteroid treatment; however, 11 (55%) required systemic corticosteroid and immunosuppressants for the treatment ofuveitis. Notable deterioration in visual outcome was found in two cases (10%) due to severe intraocular inflammation and itscomplications (uveitic glaucoma and bullous keratopathy). Recurrent uveitis was observed in 57.9% of patients. Patients withPsA tended to have higher positive rate of HLA-B27 (83.3%). However, there was no significant correlation between visualprognosis and location of psoriatic uveitis, presence of PsA, and HLA-B27 positivity. Conclusions: Psoriatic uveitis in Koreans usually presents with anterior uveitis with unilateral involvement. PsA was the mostcommon comorbidity. In majority of patients, visual outcomes are satisfactory with appropriate topical or systemic immunosuppressivetreatment.
Lee, Chaehyeon,Shin, Eui-Cheol,Ahn, Soo-Young,Kim, Seonghui,Kwak, Dongyun,Kwon, Sangoh,Choi, Yunjin,Choi, Gibeom,Jeong, Hyangyeon,Kim, Jin-Soo,Lee, Jung Suck,Cho, Suengmok The Korean Society of Fisheries and Aquatic Scienc 2022 Fisheries and Aquatic Sciences Vol.25 No.3
Sea mustard (Undaria pinnatifida), an important edible seaweed belonging to the brown algal family of Alariaceae, contains copious physiologically active substances. It has long been popular in Korea as a food and is frequently consumed in the form of soup. It is also commercially available as a home meal replacement. In this study, we developed a seasoning key base with a high degree of sensory preference from sea mustard using the extrusion cooking process. Extrusion cooking conditions were optimized through response surface methodology. Barrel temperature (X<sub>1</sub>, 140℃-160℃) and screw speed (X<sub>2</sub>, 158-315 rpm) were set as independent variables, and overall preference was determined as the dependent variable (Y, points). An optimal condition was obtained at X<sub>1</sub> = 148.5℃ and X<sub>2</sub> = 315 rpm, and the dependent variable (Y, overall acceptance) was 7.95 points, similar to the experimental value of 7.81. Umami taste had a relationship with the overall acceptance of sea mustard seasoning. In the electronic nose and tongue, increased sourness and umami intensities were associated with the highest sensory score. The samples were separated well by each characteristic via principal component analysis. Collectively, our study provides imperative preliminary data for the development of various seasonings using sea mustard.
Lee, Yonghyun,Kim, Jungyun,Kim, Wooseong,Nam, Joon,Jeong, Seongkeun,Lee, Sunyoung,Yoo, Jin-Wook,Kim, Min-Soo,Jung, Yunjin Dove Medical Press 2015 Drug design, development and therapy Vol.9 No.-
<P>Celecoxib, a selective cyclooxygenase-2 inhibitor, is potentially useful for the treatment of colonic diseases such as colorectal cancer and colitis. However, the cardiovascular toxicity of celecoxib limits its routine use in the clinic. Generally, colon-specific delivery of a drug both increases the therapeutic availability in the large intestine and decreases the systemic absorption of the drug, most likely resulting in enhanced therapeutic effects against colonic diseases such as colitis and reduced systemic side effects. To develop a colon-specific prodrug of celecoxib that could reduce its cardiovascular toxicity and improve its therapeutic activity, dextran–glutamic acid–celecoxib conjugate (glutam-1-yl celecoxib-dextran ester [G1CD]) was prepared and evaluated. While stable in pH 1.2 and 6.8 buffer solutions and small-intestinal contents, G1CD efficiently released celecoxib in cecal contents. Oral administration of G1CD to rats delivered a larger amount of celecoxib to the large intestine than free celecoxib. G1CD prevented the systemic absorption of celecoxib and did not decrease the serum level of 6-ketoprostaglandin F<SUB>1α</SUB>, an inverse indicator of cardiovascular toxicity of celecoxib. Collectively, G1CD may be a polymeric colon-specific celecoxib prodrug with therapeutic and toxicological advantages.</P>
Do we have to test hemoglobin level routinely after total laparoscopic hysterectomy?
( Yunjin Park ),( In Ok Lee ),( Jung-yun Lee ),( Eun Ji Nam ),( Han Byoul Cho ),( Sang Wun Kim ),( Jae-hoon Kim ),( Young Tae Kim ),( Sunghoon Kim ) 대한산부인과학회 2016 대한산부인과학회 학술대회 Vol.102 No.-
목적: Routine checking of hemoglobin (Hb) level after total laparoscopic hysterectomy (TLH) has been questioned by researchers. Postoperative Hb might help to find out patients who need intervention to correct postoperative anemia. The aim of this study is to investigate perioperative factors affecting to postoperative intervention and cut-off values of the factors for predicting the patients' probability of receiving postoperative intervention. 방법: Medical records of patients who underwent elective TLH in our institution from January 2012 to December 2014 were reviewed. Patients who had intraoperative complications including vaginal laceration, bladder rupture or received transfusion during the operations were excluded. Women who received transfusion or took iron agent before the operations were also excluded. Patients with or without postoperative intervention were classified. Postoperative intervention included intravenous or oral iron agent, transfusion, abdomino-pelvic computer tomography scan, and reoperation. 결과: A total of 966 women underwent TLH during study period. 265 patients (27.4%) were received postoperative intervention. Patients with postoperative intervention had lower preoperative and postoperative Hb level, longer operation time, heavy uterine weight and blood loss during operation compared with patients without postoperative intervention. (p<0.001) Analysis by subgroup divided by preoperative Hb level revealed that lower preoperative Hb level was related with smaller decrease of Hb level after operation and greater opportunity to receive postoperative intervention. (p<0.001) Cutoff value of preoperative Hb level for predicting the patients' probability of receiving postoperative intervention was 10.1 g/dL with an area under curve (AUC) of 0.837. (sensitivity: 0.343, specificity: 0.967) 결론: Possibility of having postoperative intervention after TLH is affected by not decreasing amount of Hb levels but absolute value of Hb level. Patients, whose preoperative Hb level was below 10.1g/dL, had strong possibility to take postoperative intervention to correct postoperative anemia.