• 대한환경공학회지
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• 제30권8호
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• pp.823-830
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• 2008

Rhodamine B(RhB) 탈색에 대한 광전기촉매 공정의 적용가능성을 분말 TiO$_2$를 충전한 슬러리 광전기촉매 반응기에서 연구하였다. 광전기촉매 공정의 반응기 시스템은 분말 TiO$_2$, Pt 전극 및 3개의 8 W UV-C 등으로 구성되어 있다. 전류, 전해질, 공기 유량 및 전극 재질과 같은 운전 인자의 영향을 고찰하였다. 광전기촉매 공정의 최적 광촉매 량과 전류는 각각 0.4 g/L과 0.02A이었다. 광촉매 공정과 전기분해 단독 공정에 의해 분해되는 RhB의 합보다 광전기촉매 공정에 의해 더 빨리 분해되었는데, 광촉매 공정과 전기분해 공정의 결합에 의한 시너지 효과를 나타내는 것으로 사료되었다. 광전기촉매 공정은 공기 유량에 의해 영향을 받는 것으로 나타났고 최적 공기 유량은 2 L/min이었다. RhB 탈색에 대한 전극 재질과 NaCl 효과는 본 실험범위에서는 크지 않은 것으로 나타났다.

• 간호행정학회지
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• 제4권1호
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• pp.229-246
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• 1998

This dissertation classifies sample patients by a measure of K-DRG to identify the most frequent group. and investigates the differences in the dependency of nursing by patient classification system in the SICU of Seoul National University Hospital in Korea. It also calculates the mean nursing care hours and costs per craniotomy patient, who is shown to be the most frequent patient group. The results of the research can be used as basic data for the development of relevant nursing cost system in the future. The results of the research are as follows: 1. Using data from 97 sample patients, as many as 26 groups are identified when the patients are classified by K-DRG. KDRG-001 (craniotomy) is found to be the most frequent group(43.30%). 2. The result from patient classification system grouping in craniotomy patients shows homogeneity in terms of dependency of nursing with 35 patients in the 4th group, 145 patients(74.36%) are in the 5th group. and 15 patients are in the 6th group among the total 195 sample patients. 3. The direct nursing care hours for the 4th, 5th, and 6th patient classification system groups are found to be 381 minuites. 483 minuites, and 519 minuites, respectively, which shows that the nursing care hours increases as the dependency of nursing is intensified. The indirect nursing care hours are found to be 454 minuites(7.57 hours). The total mean nursing care hours, which is the sum of the direct nursing care hours(467 min.: 7.78 hours) and the indirect nursing care hours (454 min.: 7.57 hours), is 921 minuites(15.35 hours) per patient a day. 4. The nursing care cost is calculated to be 123,297 won per patient a day. Considering the average duration in the ICU, we can find the total nursing care cost is 610,318 won.

• 한국양식학회지
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• 제11권1호
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• pp.91-97
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• 1998

이 연구에서는 해산어의 종묘 생산에 필요한 대량 배양용 로티퍼, Brachionus rotundiformis의 종 보존 방법으로서 무균 로티퍼의 이용을 검토했다. 로티퍼는 개량형 항생제 혼합액 AM9을 사용하여 무균 처리한후, 무균 Nannochloropsis oculata를 먹이로 공급하여 연속 유지 배양했다. 각각 다른 시기의 3회 (trial 1, 2 and 3)에 걸친 로티퍼 배양결과, 무균 배양 (axenic culture)에서는 비교적 안정적인 증식을 보인 반면, 유균 배양 (non-axenic culture)에서 로티퍼의 증식은 불안정적으로 각 시기에 따라서 심한 증식의 차이가 관찰되었다. 이 결과는 유균 배양에서 로티퍼의 증식에 직접적으로 악영향을 미치는 박테리아가 무균 처리과정을 통해서 제거되었음을 증명한다. 로티퍼 무균 배양 방법의 일반화 또는 대량 배양용 로티퍼의 씨앗으로서의 무균 로티퍼의 이용은 로티퍼의 안정 배양은 물론 유용 수산 생물의 대량 폐사를 일으키는 원인 생물을 사전에 제거할 수 있는 유효한 방법이 될 수 있다고 생각된다.

• 한국양식학회지
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• 제11권1호
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• pp.113-118
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• 1998

Tigriopus japonicus를 대량생산하는데 필요한 기초적인 자료를 얻기 위해 무균 배양을 통한 nauplius 유생 단계와 성체의 식성에 대하여 조사하였다. 무균 상태의 성체는 먹이로 공급한 RT 박테리아주를 적극적으로 이용하여, 순조로운 증식을 보였다. 먹이로 공급한 RT 균주의 증식은 포식자 T. japonicus의 섭식에 의해서 그 증식이 크게 억제되었다. RT 균주만을 먹이로 배양한 T. japonicus의 성체가 가지고 있는 난낭안에는 oil bead로 충만해 있었다. 그러나, 무균 상태의 N. oculata만을 먹이로 공급한 경우에는 oil bead를 전혀 관찰할 수 없었다. 무균 조건의 nauplius 유생의 경우에는 먹이로서 공급한 RT 박테리아주를 적극적으로 이용하여 RT 박테리아주의 증식을 크게 억제하였다. 이 결과는 지금까지 T. japonicus가 잡식성인 것만으로 알려진 것과는 달리, 최소한 섭식기구가 미발달된 nauplius의 초기 유생은 사육수중에 세균이 존재하지 않는 경우에는 정상적인 발생이 불가능하였다. 즉, 부화 직후 또는 발생 초기의 T. japonicus의 nauplius 유생은 박테리아식성 (bacterivorous)이었다.

• 한국양식학회지
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• 제20권3호
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• pp.178-183
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• 2007

Saddleback clownfish, Amphiprion polymnus의 자치어의 생존율 향상을 목적으로 Artemia nauplii 섭식량, 사육수조의 색깔과 염분을 달리한 조건에서 자치어의 성장과 생존율을 비교 조사하였다. 사육수조에 따른 성장과 생존율 조사에서 성장은 검정색 수조와 투명수조에서 사육한 자어가 흰색과 파란색수조에서 보다 성장이 빨랐다. 생존율은 흰색과 투명수조에서 파란색과 검정색 수조에서 보다 높았다. 부화 후 5일째부터 17일째 자어(Total length $5.1{\sim}10.0mm$)에 Artemia nauplii를 50개체/$0.5L{\sim}700$개체/0.5L 범위로 공급한 결과 일일섭식량은 36.8개체(부화 후 5일째)${\sim}$429.3개체(부화 후 17일째)였다. 그리고 염분 내성조사에서 32 psu부터 7일 간격으로 5 psu씩 하강시킨 경우 실험 16일째 22 psu에서 급격히 폐사개체가 늘어나 실험 22일째 전 개체가 폐사하였고 3일 간격으로 2 psu씩 하강시킨 경우 실험 27일째 16 psu에서 전 개체가 폐사하였다.

• Molecules and Cells
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• 제25권2호
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• pp.178-183
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• 2008

To investigate the effects of electro-acupuncture (EA) treatment on regions remote from the application, we measured cellular, enzymatic, and transcriptional activities in various internal tissues of healthy rats. The EA was applied to the well-identified acupoint ST36 of the leg. After application, we measured the activity of natural killer cells in the spleen, gene expression in the hypothalamus, and the activities of antioxidative enzymes in the hypothalamus, liver and red blood cells. The EA treatment increased natural killer cell activity in the spleen by approximately 44%. It also induced genes related to pain, including 5-Hydroxytryptamine (serotonin) receptor 3a (Htr3a) and Endothelin receptor type B (Ednrb) in the hypothalamus, and increased the activity of superoxide dismutase in the hypothalamus, liver, and red blood cells. These findings indicate that EA mediates its effects through changes in cellular activity, gene expression, and enzymatic activity in multiple remote tissues. The sum of these alterations may explain the beneficial effects of EA.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제23권4호
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• pp.196-203
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• 2012

Objectives:We analyzed the usefulness of intelligence test in assessing attention-deficit hyperactivity disorder (ADHD). Methods:The medical records of 312 patients with ADHD who visited the child psychiatry department in one university hospital in Seoul, Korea, were reviewed. Demographic data and scores on the Korean Wechsler Intelligence Scale for Children-III (K-WISC-III) and Korean-Conners' Parent Rating Scale (K-CPRS) were analyzed. To assess the relationship with comorbidities, AD-HD subjects were classified as; externalizing disorders, internalizing disorders, tic disorders, and no comorbidities. Results:Verbal intelligence quotient (VIQ) was significantly higher than performance IQ (PIQ)($102.6{\pm}14.44$, $99.2{\pm}14.48$, p<.001). Using mean scatter method, subtest scores such as 'information, similarities, digit span and coding' were significantly lower than mean scores of sum of subtests of VIQ or PIQ (p<.05). Regarding comorbidities, children with externalizing disorders exhibited. Lower scores on 'information and vocabulary' than other groups (p=.008). Children with no comorbidities exhibited higher scores on 'similarities and object assembly' than children with externalizing/internalizing disorders (p=.001) and also on 'comprehension' than children with externalizing disorders (p=.006). For subtypes of ADHD, children with hyperactive-impulsive type had higher scores on 'comprehension' than children with inattentive and combined type (p=.004). Conclusion:These results suggested that intelligence test might provide useful information for assessing ADHD.

• 한국소음진동공학회논문집
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• 제19권3호
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• pp.313-319
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• 2009

The blasting has a lot of economic efficiency and speediness but it can damage to a neighbor structure, a domestic animal and a cultured fish due to the blasting vibration, then the public grievance is increased. Therefore, we need to manage the blasting vibration efficiently. The prediction of the correct vibration velocity is not easy because there are lots of different kinds of the scale of blasting vibration and it has a number of a variable effect. So we figure the optimum line through the least-squares regression by using the vibration data measured in hard rock blasting and compared with the design vibration prediction equation. As a result, we confirm that the vibration estimated in this paper is bigger than the design vibration prediction equation in the same charge and distance. If there is a Gaussian normal distribution data on the left-right side of the least squares regression, then we can estimate the vibration prediction equation on reliability 50%(${\beta}=0$), 90%(${\beta}=1.28$), 95%(${\beta}=1.64$). 99.9%(${\beta}=3.09$). As a result, it appears to be suitable that the reliability is 99% at the transverse component, the reliability 95% is at the vertical component, the reliability 90% is at the longitudinal component and the reliability is 95% at the peak vector sum component.

• Korean Journal of Acupuncture
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• 제32권3호
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• pp.81-89
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• 2015

Objectives : The purpose of this study is to explore the trends of acupoints used for lumbar HIVD(Herniated Intervertebral Disc) and treatment and anatomical location of Hwatahyeopcheock. Methods : We searched the latest clinical studies on acupuncture treatment for lumbar HIVD(Herniated Intervertebral Disc) through domestic studies search. To analyze the data, we categorized them by year and article types of literatures and investigated often-used acupoints and acupuncture types for treatment by reading treatment part of every paper searched. Domestic and Chinese literatures related to Hwatahyeopcheock were also studied for its anatomical location. Results : Total 50 articles are searched and local points are more used than distant points for lumbar HIVD(Herniated Intervertebral Disc) and most of them showed curative effects. Back-su points were used the most and Hwatahyeopcheock use accounted for one-third of the articles. In the articles of Hwatahyeopcheock use, except for one, patients complained of both low back pain and radiating pain, and all of them showed positive results after treatment. Conclusions : Back su point is considered to have its meaning as physical region where patients feel pain including herniated disc level rather than the effect meridian system makes. Through document research and meridian muscle theory, we found that Hwatahyeopcheock means vertebral facet joint, intervertebral foramen and surrounding muscle, nerve, blood vessel and related spinal nerves.

• 전기학회논문지
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• 제67권12호
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• pp.1690-1698
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• 2018

Recent advances in ICT technology have transformed many of our daily lives and attracted a lot of attention to personal health. Heart beat measurement that reflects cardiac activities has been used in various fields such as exercise evaluation and psychological state evaluation for a long time, but its utilization method is limited due to its differentiation from clinical electrocardiogram. Therefore, in this study, we could observe the change of the measured signal according to the change of the distance and the position of the measuring electrodes which are non-standard electrode configuration. Based on the electric dipole model of the heart, correlation with clinical electrocardiogram could be confirmed by synthesizing multiple surface potentials measured with a shorter electrode distance than standard one. From the electromagnetic point of view, the distance between the measuring electrodes corresponds to the distance that the electric potential by the cardiac electric dipole moves, and the electric potential measured at the body surface is proportional to the moving distance of the electric potential. Therefore, it is preferable to make the distance between electrodes as long as possible, and to position the measuring electrode close to the ventricle rather than the atrium. In addition, it was found that standard electrocardiographic waveforms could be synthesized by using arithmetic sum of multiple measuring electrodes due to the relationship of electrical dipole vectors, which is obtained by dividing and positioning a plurality of measuring electrodes on a reference electrode line, such as Lead-I, Lead-II direction. Also, we obtained a significant Pearson correlation coefficient ($r=0.9113{\pm}0.0169$) as a result of synthetic experiments on four subjects.