• Journal of the Korean Wood Science and Technology
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• 제33권6호통권134호
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• pp.63-70
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• 2005

$225^{\circ}C$에서 $325^{\circ}C$ 이하의 저온에서 열처리한 셀룰로오스의 물성과 에틸아민 흡착특성을 열처리온도별로 조사하였다. 열처리온도의 증가와 더불어 수율이 감소하고, 탄소함량이 증가하는 반면, 수소나 산소의 함량은 감소하였다. 표면관능기량을 Boehm 법으로 측정한 결과, 열처리온도가 $300^{\circ}C$까지 올라가면 산성관능기량이 증가하였으나 그 이상의 온도에서는 다소 감소하는 경향이 있었다. 염기성관능기는 거의 존재하지 않았으며 열처리온도 $325^{\circ}C$에서 미량 확인할 수 있을 정도였다. 열처리셀룰로오스를 1점법으로 측정한 비표면적은 처리온도가 높으면 다소 증가하는 경향이 있었으나 매우 적었다. 열처리 온도가 증가할수록 셀룰로오스의 에틸아민증기 흡착량이 증가하여 $300^{\circ}C$ 처리 셀룰로오스의 에틸아민흡착에 의한 중량증가가 최대 113%를 나타내었다. $275^{\circ}C$에서 열처리셀룰로오스는 에틸아민 흡착 시, 팽윤이 일어나고 용해현상이 일어났다. $275^{\circ}C$ 이상의 온도에서 열처리한 셀룰로오스는 X선회절도 상에서 무정형화 하는 것으로 나타났다. 에틸아민 흡착한 열처리셀룰로오스의 용해 현상은 셀룰로오스의 결정구조 붕괴와 염기성 가스의 흡착량 증가에 의한 것으로 추측된다.

• 한국초전도ㆍ저온공학회논문지
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• 제15권2호
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• pp.34-38
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• 2013

AC Losses for face to face stacks of four identical coated conductors (CCs) were numerically calculated using the H-formulation combined with the E-J power law and the Kim model. The motive sample was the face to face stack of four 2 mm-wide CC tapes with 2 ${\mu}m$ thick superconducting layer of which the critical current density, $J_c$, was $2.16{\times}10^6A/cm^2$ on IBAD-MgO template, which was suggested for the mitigation of ac loss as a round shaped wire by Korea Electrotechnology Research Institute. For the calculation the cross section of the stack was simply modeled as vertically aligned 4 rectangles of superconducting (SC) layers with $E=E_o(J(x,y,t)/J_c(B))^n$ in x-y plane where $E_o$ was $10^{-6}$ V/cm, $J_c$(B) was the field dependence of current density and n was 21. The field dependence of the critical current of the sample measured in four-probe method was employed for $J_c$(B) in the equation. The model was implemented in the finite element method program by commercial software. The ac loss properties for the stacks were compared with those of single 4 cm-wide SC layers with the same critical current density or the same critical current. The constraint for the simulation was imposed in two different ways that the total current of the stack obtained by integrating J(x,y,t) over the cross sections was the same as that of the applied transport current: one is that one fourth of the external current was enforced to flow through each SC. In this case, the ac loss values for the stacks were lower than those of single wide SC layer. This mitigation of the loss is attributed to the reduction of the normal component of the magnetic field near the SC layers due to the strong expulsion of the magnetic field by the enforced transport current. On the contrary, for the other case of no such enforcement, the ac loss values were greater than those of single 4cm-wide SC layer and. In this case, the phase difference of the current flowing through the inner and the outer SC layers of the stack was observed as the transport current was increased, which was a cause of the abrupt increase of ac loss for higher transport current.

• 한국양식학회지
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• 제15권3호
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• pp.131-138
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• 2002

수온과 사육밀도에 따른 홍민어의 성장을 조사하기 위하여 20${\pm}$0.5, 23${\pm}$0.5 그리고 26${\pm}$0.5$^{\circ}C$로 각각 조절한 항온 수조에서 평균전장 4.60${\pm}$0.3 cm, 체중 1.17${\pm}$0.6 g되는 치어를 32주간 비교 사육하였으며, 평균 전장 26.6${\pm}$1.7cm, 체중 213.6${\pm}$46.7 g되는 개체를 대상으로 사육밀도 2.16, 4.24 그리고 6.40 kg BW/㎥로 조절하여 25주 동안 사육하였다. 수온에 따른 성장실험에서 전장, 체중, 일간 성장률에서 26$^{\circ}C$, 23$^{\circ}C$, 20$^{\circ}C$ 순으로 수온이 높을수록 빠른 성장을 하였다. 일간섭식율에서도 26$^{\circ}C$에서 가장 높아 수온이 높을수록 높은 값을 나타내었다(P<0.05). 사육밀도에 따른 성장실험에서 전장, 체중, 일간성장률에서 저밀도 실험구에서 높은 값을 나타내었고 일간섭식율에서도 같은 경향이었으며(P<0.05), 실험 시작시 2.16 kg BW/$m^3$, 4.24 kg BW$m^3$ 그리고 6.40 kg BW$m^3$의 사육밀도는 실험 종료시 각각 7.26 kg BW$m^3$, 14.01 kg BW$m^3$, 19.17kg BW$m^3$로 증가하여 6.40 kg$m^3$에서 생산성이 가장 높았다

• 한국게임학회 논문지
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• 제9권6호
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• pp.45-56
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• 2009

재미학(funology)을 기반으로 재미학, 프로이드의 쾌감이론, 칙센트미하이의 몰입(Flow)이론, 윌리엄 글라써 욕망이론, 아브라함 매슬로우 욕구이론, 로제카이와의 놀이 분류 이론 을 통해 쾌감요소를 추출하였다. 이렇게 추출된 쾌감 요소를 게임에 직접적으로 대입하여 온라인 1인칭 슈팅(First-Person Shooter, FPS) 게임에서 1차적으로 필요한 쾌감요소로 재 추출하였다. 그리고 온라인 FPS게임 전문가 인터뷰를 통해 쾌감의 구성 요소를 2차로 정리 하였고 3차로 유명 국내 온라인 4개(서든 어택, 카운터스트라이크, 아바, 팀 포트리스2)에 대해 전문가의 인터뷰를 실시하여 빈도 분석을 통해 쾌감의 구성 요소를 압축 하여 추출 하였다. 이 데이터를 기반으로 게임 조작적 정리 방법을 사용하여 가설을 세웠고, 그 가설을 증명하기 위해 설문 조사를 실시해서 얻은 데이터를 SAS라는 통계 패키지를 이용해서 쾌감요인들인 종속변수와 선호도인 독립변수인 회귀 분석 식을 사용하여 쾌감의 구성요소와 게임선호도의 상관관계를 증명하였다. 이상 결과를 종합하여 보면, 온라인 FPS게임에서 쾌감 요소는 게임을 더욱 몰입하게 만들고 오래 지속적으로 게임을 즐기게 만드는 요소로써 상관관계가 있다는 것을 논리적으로 파악 할 수 있는데, 온라인 FPS게임에 대해서 고유한 특징 구조 및 인간의 쾌감에 대해서 이론적으로, 경험적으로 심층 분석 한 요소 정리가 부족한 현실에서 본 연구는 게임 연구나 개발에 중요한 근거를 제시 할 수 있을 것으로 기대한다.

• Asian Pacific Journal of Cancer Prevention
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• 제13권7호
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• pp.3223-3228
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• 2012

HMGN5 is a typical member of the HMGN (high mobility group nucleosome-binding protein) family which may function as a nucleosomal binding and transcriptional activating protein. Overexpression of HMGN5 has been observed in several human tumors but its role in tumorigenesis has not been fully clarified. To investigate its significance for human lung cancer progression, we successfully constructed a shRNA expression lentiviral vector in which sense and antisense sequences targeting the human HMGN5 were linked with a 9-nucleotide loop. Inhibitory effects of siRNA on endogenous HMGN5 gene expression and protein synthesis were demonstrated via real-time RT-PCR and western blotting. We found HMGN5 silencing to significantly inhibit A549 and H1299 cell proliferation assessed by MTT, BrdU incorporation and colony formation assays. Furthermore, flow cytometry analysis showed that specific knockdown of HMGN5 slowed down the cell cycle at the G0/G1 phase and decreased the populations of A549 and H1299 cells at the S and G2/M phases. Taken together, these results suggest that HMGN5 is directly involved in regulation cell proliferation in A549 and H1299 cells by influencing signaling pathways involved in cell cycle progression. Thus, our finding suggests that targeting HMGN5 may be an effective strategy for human lung cancer treatment.

• Asian Pacific Journal of Cancer Prevention
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• 제15권8호
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• pp.3471-3476
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• 2014

Background: Aberrant expression of the microRNA-29 family is associated with tumorigenesis and cancer progression. As transport carriers, tumor-derived exosomes are released into the extracellular space and regulate multiple functions of target cells. Thus, we assessed the possibility that exosomes could transport microRNA-29c as a carrier and correlations between microRNA-29c and apoptosis of bladder cancer cells. Materials and Methods: A total of 28 cancer and adjacent tissues were examined by immunohistochemistry to detect BCL-2 and MCL-1 expression. Disease was Ta-T1 in 12 patients, T2-T4 in 16, grade 1 in 8, 2 in 8 and 3 in 12. The expression of microRNA-29c in cancer tissues was detected by quantitative reverse transcriptase PCR (QRT-PCR). An adenovirus containing microRNA-29c was used to infect the BIU-87 human bladder cancer cell line. MicroRNA-29c in exosomes was measured by QRT-PCR. After BIU-87 cells were induced by exosomes-derived microRNA-29c, QRT-PCR was used to detect the level of microRNA-29c. Apoptosis was examined by flow cytometry and BCL-2 and MCL-1 mRNA expressions were assessed by reverse transcription-polymerase chain reaction. Western blotting was used to determine the protein expression of BCL-2 and MCL-1. Results: The expressions of BCL-2 and MCL-1 protein were remarkably increased in bladder carcinoma (p<0.05), but was found mainly in the basal and suprabasal layers in adjacent tissues. The expression of microRNA-29c in cancer tissues was negatively correlated with the BCL-2 and MCL-1. The expression level of microRNA-29c in exosomes and BIU-87 cells from the experiment group was higher than that in control groups (p<0.05). Exosome-derived microRNA-29c induced apoptosis (p<0.01). Although only BCL-2 was reduced at the mRNA level, both BCL-2 and MCL-1 were reduced at the protein level. Conclusions: Human bladder cancer cells infected by microRNA-29c adenovirus can transport microRNA-29c via exosomes. Moreover, exosome-derived microRNA29c induces apoptosis in bladder cancer cells by down-regulating BCL-2 and MCL-1.

• Asian Pacific Journal of Cancer Prevention
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• 제15권8호
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• pp.3651-3657
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• 2014

Hepatocellular carcinoma (HCC) has a relatively higher incidence in many countries of Asia. Globally, HCC has a high fatality rate and short survival. Epirubicin, a doxorubicin analogue, may be administered alone or in combination with other agents to treat primary liver cancer and metastatic diseases. However, the toxic effects of epirubicin to normal tissues and cells have been one of the major obstacles to successful cancer chemotherapy. Here, we investigated the effects of epirubicin in combination with kappa-selenocarrageenan on mice with H22 implanted tumors and HepG-2 cell proliferation, immune organ index, morphology, cell cycle and related protein expressions in vivo and in vitro with sequential drug exposure. The inhibitory rate of tumor growth in vivo was calculated. Drug sensitivity was measured by MTT assay, and the King's principle was used to evaluate the interaction of drug combination. Morphological changes were observed by fluorescent microscopy. Cell cycle changes were analyzed by flow cytometry. Expression of cyclin A, Cdc25A and Cdk2 were detected by Western blotting. In vivo results demonstrated that the inhibitory rate of EPI combined with KSC was higher than that of KSC or EPI alone, and the Q value indicated an additive effect. In addition, KSC could significantly raise the thymus and spleen indices of mice with H22 implanted tumors. In the drug sensitivity assay in vitro, exposure to KSC and EPI simultaneously was more effective than exposure sequentially in HepG-2 cells, while exposure to KSC prior to EPI was more effective than exposure to EPI prior to KSC. Q values showed an additive effect in the simultaneous group and antagonistic effects in the sequential groups. Morphological analysis showed similar results to the drug sensitivity assay. Cell cycle analysis revealed that exposure to KSC or EPI alone arrested the cells in S phase in HepG-2 cells, exposure to KSC and EPI simultaneously caused accumulation in the S phase, an effect caused by either KSC or EPI. Expression of cyclin A, Cdc25A and Cdk2 protein was down-regulated following exposure to KSC and EPI alone or in combination, exposure to KSC and EPI simultaneously resulting in the lowest values. Taken together, our findings suggest that KSC in combination with EPI might have potential as a new therapeutic regimen against HCC.

• 대한한의학방제학회지
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• 제11권1호
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• pp.57-90
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• 2003

The result of Bibliographic studies on the pathological mechanism of the sudden coma, we got the conclusion like this. 1. The sudden coma is an acute syndrome that refers to be a sudden fainting, an unconsciousness, an aphasia or a cold clammy limb, and immediately awakes or dies, and awakes in a short time, and if we awake, it doesn't leave over and above a sequela. 2. The clinical presentation of the sudden coma can be summarized as follows : The 1st is a disease raising the sudden death due to unconsciousness accompanied by wry mouth & sudden syncope with coma. The 2nd is simply the state of cold limbs. The 3rd is the meaning of the physique and symptomes of the six meridians. The last is the ancient method of expression in contrast of the beriberi. 3. The pathological mechanism of the sudden coma consists of the toxoid from outside, Qi and Xie, fatigue, damp phegm, the damage from seven emotions and the damage from five mental elements, especially the mental disorder due to the angry energy, causes the problems when the fleming-up of liver fire and the depressed of liver qi raise the physiological disorder. 4. Therapeutic methods of sudden coma are soothing the liver and remove stasis, soothing depression and circulating of the qi, calming the liver and suppressing yang. When that is early stage, at first, we must checking upward adverse flow of the qi after promoting the circulation of qi and awakening, and then, we must regulate excessive deficiency of yin yang by therapy that is based on differentiated in symptoms according to heat & cold, deficiency & excess, and use invigorating herb medicine for supporting vigour.

• Asian-Australasian Journal of Animal Sciences
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• 제29권12호
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• pp.1725-1733
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• 2016

Recent findings have shown that microbial nitrogen flow and digestible energy of diets are increased when urea is combined with a slow-release urea (SRU) in diets with a starch to acid detergent fibre ratio (S:F) 4:1. This affect is attributable to enhanced synchrony between ruminal N availability for microbial growth and carbohydrate degradation. To verify the magnitude of this effects on lamb performance, an experiment was conducted to evaluate the effects of combining urea and a SRU in diets containing S:F ratios of 3:1, 4:1, or 5:1 on performance, dietary energetics and carcass characteristics of finishing lambs. For that, 40 Pelibuey${\times}$Katahdin lambs ($36.65{\pm}3kg$) were assigned to one of five weight groupings in 20 pens (5 repetition/treatments). The S:F ratio in the diet was manipulated by partially replacing the corn grain and dried distiller's grain with solubles by forage (wheat straw) and soybean meal to reach S:F ratios of 3:1, 4:1 or 5:1. An additional treatment of 4:1 S:F ratio with 0.8% urea as the sole source of non-protein nitrogen was used as a reference for comparing the effect of urea combination vs. conventional urea at the same S:F ratio. There were no treatment effects on dry matter intake (DMI). Compared the urea combination vs urea at the same S:F ratio, urea combination increased (p<0.01) average daily gain (ADG, 18.3%), gain for feed (G:F, 9.5%), and apparent energy retention per unit DMI (8.2%). Irrespective of the S:F ratio, the urea combination improved the observed-to-expected dietary ratio and apparent retention per unit DMI was maximal (quadratic effect, $p{\leq}0.03$) at an S:F ratio of 4:1, while the conventional urea treatment did not modify the observed-to-expected net energy ratio nor the apparent retention per unit DMI at 4:1 S:F ratio. Urea combination group tended (3.8%, p = 0.08) to have heavier carcasses with no effects on the rest of carcass characteristics. As S:F ratio increased, ADG, G:F, dietary net energy, carcass weight, dressing percentage and longissimus thoracis (LM) area increased linearly ($p{\leq}0.02$). Combining urea and a slow-release urea product results in positive effects on growth performance and dietary energetics, but the best responses are apparently observed when there is a certain proportion (S:F ratio = 4:1) of starch to acid detergent fibre in the diet.

• Clinical and Experimental Pediatrics
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• 제45권12호
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• pp.1540-1545
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• 2002

목 적 : 방광요관역류는 국외의 연구에 의하면 가족력이 중요하며 무증상 형제 자매에서의 방광요관역류 발생빈도가 26-51%의 높은 빈도로 보고되고 있고 역류성 신병증, 소아 고혈압, 만성 신부전으로 진행될 수 있으므로 선별검사의 중요성이 강조되어 왔는데 우리나라 소아에서도 무증상 형제 자매의 방광요관역류 빈도를 조사하여 선별검사의 근거를 제시하고자 본 연구를 시행하였다. 방 법: 인제대학교 의과대학 상계백병원에 내원하여 방광요관역류로 진단받은 환아 중 VCUG 검사에 동의한 28명의 무증상 형제 자매를 대상으로 하였고 방광요관역류 환아의 무증상 형제 자매 중 VUR로 진단받은 형제 자매는 모두 DMSA 신스캔을 시행하였다. 결 과 : VUR로 진단받은 환아는 총 28명이고 남아 14 명, 여아 14 명, 나이는 1개월에서 8년 5개월로 평균 2.7세였다. VCUG 검사에 동의한 무증상 형제 자매는 총 28명으로 남아 17명, 여아 11명, 나이는 2개월에서 7년 5개월로 평균 3.3세였다. VUR로 진단된 환아 28명 중 20례에서 신손상이 있어 전체적으로 71.4%의 신손상의 빈도를 보였다. 무증상 형제 자매 28명 중 VCUG 검사상 VUR로 진단된 형제 자매는 3명으로 10.7%의 VUR 발생빈도를 보였고 DMSA 신스캔 상 이상이 발견된 경우는 1명이였다. 결 론 : 방광요관역류 환아의 무증상 형제 자매에서 역류빈도는 10.7%로 조사되어 방광요관역류의 위험인자로서 가족력이 중요함을 제시해주고 있으며 방광요관역류의 가족선별검사의 근거를 확립하기 위해서 앞으로 더 많은 연구가 시행되어야 하겠다.