삼나무 (杉) 내한성 (耐寒性) 품종 선발에 관한 연구

홍성각,조태환,황증 ( Sung Gak Hong,Tae Hwan Cho,Jeung Hwang ) 한국산림과학회 1981 한국산림과학회지 Vol.51 No.1

This study was designed to know difference in degree of dehardening and rehardening respectively by artificial high and low temperature treatments among different clonal seedlings and seedlings from different seed sources of Cryptomeria japonica which have been grown under the cold areas in Japan and Korea. High temperature treatment was done with 15 to 20℃ under 100% relative humidity for one to nine days and low temperature treatment was carried with -7℃ for one to three days. Occasionaly, high temperature treatment was combined and followed by low temperature treatment. The ability of stem section to delay dehardening by high temperature treatment and/or to hasten rehardening by low temperature treatment was used as an indicator of adaptability under extreme temperature fluctuation in nature. Clones and seedlings from different seed sources which showed greater freezing resistance than others after artificial high and/or low temperature treatments were selected over two to three time periods: early winter, mid winter and early spring in 1977 to 1980. These were Seoul #7, and #9, Namboo #3, and #4, Sung-Kang #11, Chung-Sam #8 and Huek-Suk #9. These selected seedlings might have survival advantage to withstand early and late frost damage, especially the critical frost damage of the basal stem, since it was known to be induced by lowering freezing resistance of the basal part when exposed to the high temperature near the ground during the day. Large variation in freezing resistance and degree of dehardening and rehardening was found among clonal or seed sources and among individuals within a seed source, but was not related to the difference in climatic conditions where the parent trees was selected. These indicated the possibility of future breeding work for more cold resistant family of Cryptomeria japonica.

Original Articles : Clinical significance of occult hepatitis B virus infection in chronic hepatitis C patients

( Jae Young Jang ),( Soung Won Jeong ),( Sung Ran Cheon1 ),( Sae Hwan Lee1 ),( Sang Gyune Kim ),( Young Koog Cheon ),( Young Seok Kim1 ),( Young Deok Cho1 ),( Hong Soo Kim ),( So Young Jin ),( Yun Soo 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.3

Background/Aims: We investigated the frequency of occult hepatitis B virus (HBV) infection in anti-hepatitis C virus (HCV)-positive individuals and the effects of occult HBV infection on the severity of liver disease. Methods: Seventy-one hepatitis B virus surface-antigen (HBsAg)-negative patients were divided according to their HBV serological status into groups A (anti-HBc positive, anti-HBs negative; n=18), B (anti-HBc positive, anti-HBs positive; n=34), and C (anti-HBc negative, anti-HBs positive/negative; n=19), and by anti-HCV positivity (anti-HCV positive; n=32 vs. anti-HCV negative; n=39). Liver biopsy samples were taken, and HBV DNA was quantified by real-time PCR. Results: Intrahepatic HBV DNA was detected in 32.4% (23/71) of the entire cohort, and HBV DNA levels were invariably low in the different groups. Occult HBV infection was detected more frequently in the anti-HBc-positive patients. Intrahepatic HBV DNA was detected in 28.1% (9/32) of the anti-HCV-positive and 35.9% (14/39) of the anti-HCV-negative subjects. The HCV genotype did not affect the detection rate of intrahepatic HBV DNA. In anti-HCV-positive cases, occult HBV infection did not affect liver disease severity. Conclusions: Low levels of intrahepatic HBV DNA were detected frequently in both HBsAg-negative and anti-HCV-positive cases. However, the frequency of occult HBV infection was not affected by the presence of hepatitis C, and occult HBV infection did not have a significant effect on the disease severity of hepatitis C. (Korean J Hepatol 2011;17:206-212)

연구보문 : 식물환경 ; 폐가축사체의 농업적 재활용을 위한 가축사체 액상부산물의 액비화 조건 구명

서영진 ( Young Jin Seo ),서동철 ( Dong Cheol Seo ),강세원 ( Se Won Kang ),이상규 ( Sang Gyu Lee ),박주왕 ( Ju Wang Park ),최익원 ( Ik Won Choi ),성환후 ( Hwan Hoo Sung ),강석진 ( Seog Jin Kang ),조주식 ( Ju Sik Cho1 ) 한국환경농학회 2013 한국환경농학회지 Vol.32 No.4

가축사체 액상부산물을 이용하여 액비의 최적조건(미생물, pH, 미생물 주입량)을 조사하였고, 이들 최적 조건하에서 112일간 부숙하여 액비의 품질을 평가하였다. 가축사체 액상 부산물 액비 부숙시 최적 LP 미생물의 주입량은 0.5 mL/100mL이었으며, pH는 7 조건에서 각각 50점으로 완숙판정을 받았다. 최적조건하에서 112일 동안 부숙시킨 액비의 부숙도 는 부숙 후 28일에 50점을 받아 완숙판정을 받았으며, 부숙기 간이 길어짐에 따라 부숙 56일에는 온도가 60℃를 넘어 최고 점인 55점을 받았고, 이후 온도가 조금씩 낮아져 부숙 후 112 일에는 실온조건에 이르렀다. 완숙된 가축사체 액상부산물 액 비의 품질을 평가해본 결과, 최적조건하에서 부숙시킨 액비의 경우에는 T-N, P2O5 및 K2O의 함량이 28일에 가장 높았으며, 시간이 경과함에 따라 약간 감소하는 경향이었다. 또한, 유해성분(As, Cd, Cu, Cr, Hg, Ni, Pb 및 Zn)의 함량은 28일, 56일 및 112일 부숙시킨 액비에서 모두 비료공정규격 기 준치에 적합하였다. 이상의 결과를 미루어 볼 때 가축사체 액상부산물을 농업적 재활용을 위한 액비화 조건은 pH 7조건 에서 LP 미생물을 0.5 mL/100 mL 주입한 경우이다. 하지 만 본 연구에서 비교된 가축분뇨 발효액은 공시재료(가축사체)가 상이하여 향후 가축사체를 이용한 액비의 부숙도 기준이 개선되어야 할 것으로 판단된다. BACKGROUND: Globally, concern about emerging infectious diseases of livestock is growing. For the disposal of the animal carcass, it is necessary to recycle the carcass into an agriculturally usable product. The objective of this study was to investigate the composting conditions of liquid by-product obtained from degradation of animal carcass. METHODS AND RESULTS: Optimum conditions of liquid fertilizer were investigated using different microorganisms, pHs, and volumes of microorganisms (Lactobacillus rhamnosus + Pichia deserticola). Based on the results from the optimum conditions, compost maturity and quality of liquid fertilizer were evaluated for 112 days. The compost maturity of liquid fertilizer were higher in the order of LP(Lactobacillus rhamnosus + Pichia deserticola) > BC(Bacillus cereus) > BS (Bacillus subtilis). The optimum condition under different volumes of LP was injection of 0.5 mL/100 mL. The compost maturity under different pHs were higher in the order of pH 7 > 5 ≥ 9 ÷ 11. The liquid by-product at 56 days after composting was completely decomposed. The concentrations of T-N, T-P and K2O in liquid fertilizer at 56 days were 0.94, 0.17 and 3.78%, respectively, and the sum of those concentrations was 4.89%. CONCLUSION(S): Liquid fertilizer of by-product using pig carcass was decomposed with optimum conditions(LP, pH 7, injection of 0.5 mL/100 mL) in 56 days after composting, and was suitable for official standard of commercial fertilizer.

The Potential Barrier Heights and the Carrier Densities of ZnO Varistors with Various Compositions

Cho, Sung-Gurl,Kwak, Min-Hwan,Lee, Sang-Ki,Kim, Hyung-Sik The Korean Ceramic Society 1998 The Korean journal of ceramics Vol.4 No.1

The barrier heights and carrier densities of ZnO varistors with various compositions were estimated using C-V, J-V and $\rho$-T relations. The barrier heights obtained from C-V and J-V plots were 0.73~5.98 eV and 0.25~2.70 eV, respectively. The carrier densities estimated from C-V plots were ~$10^{18}cm^{-3}$. Acceptable values of the barrier heights and the carrier densities were obtained from $\rho$-1/T curves and the capacitances at zero bias; 0.6~0.8 eV for the barrier heights and ~$10^{17}cm^{-3}$ for carrier densities. Addition of cobalt increased the barrier height and the carrier density, while chromium slightly lowered both of them.

Image-guided navigation surgery for bilateral choanal atresia with a Tessier number 3 facial cleft in an adult

Sung, Ji Yoon,Cho, Kyu-Sup,Bae, Yong Chan,Bae, Seong Hwan Korean Cleft Palate-Craniofacial Association 2020 Archives of Craniofacial Surgery Vol.21 No.1

The coexistence of craniofacial cleft and bilateral choanal atresia has only been reported in three cases in the literature, and only one of those cases involved a Tessier number 3 facial cleft. It is also rare for bilateral choanal atresia to be found in adulthood, with 10 previous cases reported in the literature. This report presents the case of a 19-year-old woman with a Tessier number 3 facial cleft who was diagnosed with bilateral choanal atresia in adulthood. At first, the diagnosis of bilateral choanal atresia was missed and septoplasty was performed. After septoplasty, the patient's symptoms did not improve, and an endoscopic examination revealed previously unnoticed bilateral choanal atresia. Computed tomography showed left membranous atresia and right bony atresia. The patient underwent an operation for opening and widening of the left choana with an image-guided navigation system (IGNS), which enabled accurate localization of the lesion while ensuring patient safety. Postoperatively, the patient became able to engage in nasal breathing and reported that it was easier for her to breathe, and there were no signs of restenosis at a 26-month follow-up. The patient was successfully treated with an IGNS.

Temperature-Dependent Characteristics of Cylindrical Gate-All-Around Twin Silicon Nanowire MOSFETs (TSNWFETs)

Cho, Keun Hwi,Suk, Sung Dae,Yeoh, Yun Young,Li, Ming,Yeo, Kyoung Hwan,Kim, Dong-Won,Park, Donggun,Lee, Won-Seong,Jung, Young Chai,Hong, Byung Hak,Hwang, Sung Woo IEEE 2007 IEEE electron device letters Vol.28 No.12

<P> The characteristics of cylindrical gate-all-around twin silicon nanowire field-effect transistors with a radius of 5 nm have been measured in temperatures <TEX>$T$</TEX> ranging from 4 to 300 K. The <TEX>$T$</TEX> dependence of the off-current suggests that thermal generation in the channel is the main leakage mechanism. The <TEX><TEX>$T$</TEX> </TEX> dependence of the subthreshold swing exhibits no body effects but shows degradations due to slight differences in the threshold voltages and in the body effect constants of the twin nanowires. The <TEX>$T$</TEX> dependence of the peak normalized transconductance <TEX>$g_{m}/V_{\rm DS}$</TEX> gives a clue of 1-D phonon scattering and suggests that surface roughness scattering at the nanowire wall is dominant at low <TEX>$T$</TEX> values. </P>

Bendable and Splitter-Integrated Optical Subassembly Based on a Flexible Optical Board

Sung Hwan Hwang,Jung Woon Lim,Woo-Jin Lee,Gye Won Kim,Che Hyun Cho,Jong Bea An,Ki Young Jung,Kyung Soon Cha,Byung Sup Rho IEEE 2010 IEEE photonics technology letters Vol.22 No.3

<P>A bendable and splitter-integrated optical subassembly (OSA) is suggested as a short-distance board-to-board optical interconnection. This OSA was fabricated by simply packaging a vertical-cavity surface-emitting laser on a flexible optical board having an embedded 1 × 8 optical splitter waveguide. Finally, we measured various optical characteristics of the OSA, including insertion, twist, and bending losses.</P>

Kinetic Analysis of the Decomposition of Calcium Carbonate Using Danyang Limestone

Cho, Sang Hwan,Joo, Sung Min,Cho, Jin Sang,Yu, Young Hwan,Ahn, Ji Whan,Han, Choon,Kim, Hwan Trans Tech Publications, Ltd. 2006 Materials science forum Vol.510 No.-

<P>Non-isothermal behaviors of calcium carbonate using Danyang limestone were investigated. It was attempted to provide non-isothermal data with a precision sufficient for the determination of reliable decomposition behaviors and for the estimation of accurate kinetic parameter. The decomposition temperature of calcium carbonate on the onset, peak and final point were measured. Reaction rate was decreased and maximum reaction temperature was increased with increasing heating rate. Activation energy of Danyang limestone was 45.14㎉/㏖ and 50.80㎉/ ㏖ by Kissinger method and Freeman method, respectively.</P>

Change of Formation Yield and Characterization of PCC Particle Synthesized with Impurity Ions Contents by Carbonation Process

Cho, Jin Sang,Joo, Sung Min,Cho, Sang Hwan,Yu, Young Hwan,Kim, Im Ho,Kim, Hwan,Han, Choon Trans Tech Publications, Ltd. 2006 Materials science forum Vol.510 No.-

<P>The effect of the impurity ions Al3+, Fe3+ and Mg2+ on the formation yield and crystal properties of precipitated calcium carbonate(PCC) produced by the carbonation process was investigated in Ca(OH)2-H2O-CO2 system. The effect of the impurity ions Al3+, Fe3+ and Mg2+ on the formation yield using particle size distribution and morphology of PCC were discussed. The particle size distribution of PCC was increased with increase of impurity ions. The morphology was transformed in order of spheroidal, scalenohedral, rhombohedral calcite for Al3+, Fe3+ and rhombospheroidal, spherical, scalenohedral for Mg2+ with increase of impurity ions. </P>

Differential Benefit of Statin 2ndary Prevention of AMI according to level of TG and HDL cholesterol

( Sang Woo Jeong ),( Wan Kim ),( Sun Ho Hwang ),( Won Yu Kang ),( Sang Cheol Cho ),( Kyung Hwan Kim ),( Gyu Ik Lee ),( Young Eun Jo ),( Myung Ho Jeong ),( Young Keum Ahn ) 대한내과학회 2015 대한내과학회 추계학술대회 Vol.2015 No.1

Background: The benefit of statin in acute myocardial infarction (MI) was well established. However, there were few studies about the differential efficacy of statin according to the baseline level of triglyceride and high-density lipoprotein (HDL)-cholesterol. Objective: To address the efficacy of statin in secondary prevention of MI according to the level of triglyceride and HDL-cholesterol on admission. Methods: The 36580 acute MI patients were enrolled from November 2005 to August 2012. Total patients were divided according to level of triglyceride and HDL cholesterol on admission and evaluated the efficacy of statin in patients with no lipid component of metabolic syndrome (Group A; n=15,461) (HDL cholesterol ≥40 mg/dL & triglyceride <150 mg/dL) and both components of metabolic syndrome (Group B; n=4,399)(HDL<0.001). However, the efficacy of statin was not prominent in Group B (HR=0.987; 95% CI; 0.708-1.376; p=0.939). After propensity matching, the survival analysis revealed that statin therapy reduced the risk of MACE in group A (HR=0.752, 95% CI; 0.609-0.929, p=0.008). This result was mainly due to reduction of cardiac death (HR=0.628, 95% CI; 0.420-0.938, p=0.023). Multivariate analysis revealed that use of statin contributed independently to improvement of clinical outcome in only Group A (HR=0.692, CI; 0.543-0.882, p=0.003). Conclusions: The long-term benefit ofstatin was not prominent in acute MI patients with lipid profiles of metabolic syndrome. Therefore, different lipid-lowering strategy is necessary in patients with low HDL and high triglyceride.