재발성 복부 통증을 호소한 환자에서 복벽에 발생한 자궁내막증 1예

홍현진,박성한,이준식,배용목,김지연,안광순,박선자 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.1

Endometriosis is the abnormal growth of endometrial tissue outside the uterine cavity. Endometriosis in the abdominal scar following cesarean section is very rare condition among the extrapelvic endometriosis. The frequency of abdominal wall endometriosis secondary to cesarean section is from 0.03% to 0.8% in some reports. It is difficult to diagnosed in spite of the typical symptoms. The typical symptom is aching swelling in the area of the surgical scar, which is influenced by the phases of menstruation. The definitive diagnosis is established by pathologic analysis. Surgical excision remains the treatment of choice. The majority of patients presented from 1 to 2 years after the precipitating operation. We experienced an unusual case of abdominal wall endometriosis presented over 10 years after cesarean section, who was admitted to our hospital complaining of recurrent left lower abdominal pain. So, we report this case with a brief review of the concerned literatures.

토양환경지도 자료를 이용한 콩밭 토양의 화학성 비교

박지숙,이민진,정재원,김미혜,이서연,지윤미,한준호,김유학,공명석,한광현,노희명 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.2

It is important to interpret the soil chemical properties in order to effectively manage the farmland. This study was conducted to investigate the soil chemical properties of upland soybean field according to the soil series at 32 upland fields located in the parts of Gangwon-do. Soil sampling sites were selected by using the National Statistics DB and KSIS DB that is a soil environment information system provided by the Rural Development Administration. Soil samples were collected from 0~15 cm of top soil before seeding or transplanting, air-dried, passed through a 2 mm sieve, and analyzed for soil pH, EC, organic matter, available phosphorus (P2O5), exchangeable potassium, exchangeable calcium and exchangeable magnesium. The average chemical properties have exceeded the each nutrient optimum range level of RDA, except the organic matter in experimental soil 2015. And despite application of conventional fertilization, each soil series nutrient contents were change respectively. The results of this study suggest that conventional fertilization should be applied based on the analysis about the amount of accumulated nutrient contents in the soil.

Contamination Source Assessment of Groundwater Nitrate in a Complex Terrain

Gwang-Hyun Han(한광현) 한국토양비료학회 2009 한국토양비료학회지 Vol.42 No.1

토지이용에서 보았을 때 제주도는 해안을 따라 넓게 분포하는 밭과 과수원의 화학비료와, 중산간 지대 방목지의 가축분뇨 및 산발적으로 존재하는 주거지역의 생활하수에 의한 질산태 질소 오염이 추정되었다. 질소동위원소 분석이 이들 오염원들을 구분하기 위하여 사용되었으며, 주요 오염원인 요소, 유안, 축분정화조, 축분유기질 비료에 대해 측정된 δ15N 값을 토대로 화학비료에 의한 오염은 5 ‰ 이하, 생활하수 혹은 가축분뇨에 의한 오염은 10 ‰ 이상으로 기준을 정하였다. 제주도 전역에 걸친 33개 관정의 질산태 질소 동위원소 분석결과는 대부분의 관정이 화학비료에 의해 오염되었으며, 일부 관정이 가축분뇨와 생활하수에 의해 영향받았음을 나타내었다. 이러한 결과는 질소동위원소분석이 토지이용분류로는 판별하기 어려운 오염원 추정에 매우 유용한 수단이 될 수 있음을 나타낸다. 특히 좁은 지역에서 토지이용이 다양하게 이루어 지고 있는 경우에 중요한 오염원추정 수단이 될 수 있음을 경기, 강원 지역의 지하수 분석을 통해 확인할 수 있었으며, 또한 두 가지 이상의 오염원이 동시에 작용할 수 있고 그 기여도가 시기별로 달라질 수 있음을 확인하였다 Classification of land uses and analysis of nitrogen isotope fractionation in groundwater nitrate were carried out to examine its contamination sources in Jeju province. δ<SUP>15</SUP>N values of urea (hydrolyzed with urease), ammonium sulfate, compost, water from septic tank were -1.7, -5.8, +14.1, and +24.0 ‰, respectively. Urea, when it was directly distillated, showed -16.5 ‰. Based on these δ<SUP>15</SUP>N values, sources of nitrate could be classified as originated from chemical fertilizers with δ15N values below +5 ‰ and as from animal manure or municipal waste with δ<SUP>15</SUP>N values over +10 ‰. Results of δ<SUP>15</SUP>N analysis of 33 wells showed that most wells had the chemical fertilizers as their dominant contamination source. However, some wells were contaminated by other sources: animal wastes or municipal wastes. Some wells were also contaminated by the combined sources of nitrate. It was also demonstrated that δ<SUP>15</SUP>N analysis could be a useful tool even in the case where no apparent contamination source is found.

Simultaneous Determination of Carbon Isotopic Signatures of CO2 and Methane Exchanged Between the Paddy Ecosystem and the Atmosphere under Natural Conditions

Gwang Hyun Han,Young Bae Sim,Hisashi Yoshikoshi,Akira Miyata 한국응용생명화학회 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.6

At the ecosystem and global scales, the carbon isotopic compositions of CO2 and methane exchanged between the biosphere and the atmosphere (δN and δM, respectively) have been used to partition net fluxes of CO2 and methane into the source and sink terms. The temporal variations of δN and δM were investigated at the same time in a Japanese rice paddy by combining stable isotopes and concentration measurements within and above the canopy. There were close agreements between the measured concentrations and the δ13C values of CO2 and methane on both temporal and spatial scales. While atmospheric stability and environmental parameters influencing photosynthetic assimilation were the major controls on variability of [CO2] and δ13CO2,atmospheric stability was the predominant factor for driving changes in [CH4] and δ13CH4 profiles.We also found strong linear relationships between the measured isotopic compositions and the inverse of concentrations over the time spans of day, night, and whole day. The δN values determined on the two days contrasting in environmental conditions revealed that the relative contributions of photosynthetic assimilation and ecosystem respiration to the total CO2 exchange did not change significantly. In contrast, the δM values showed a marked difference between the sampling dates, reflecting a transpiration-induced shift in methane transport.

Simultaneous Determination of Carbon Isotopic Signatures of $CO_2$ and Methane Exchanged Between the Paddy Ecosystem and the Atmosphere under Natural Conditions

Han, Gwang-Hyun,Sim, Young-Hae,Yoshikoshi, Hisashi,Miyata, Akira The Korean Society for Applied Biological Chemistr 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.6

At the ecosystem and global scales, the carbon isotopic compositions of $CO_2$ and methane exchanged between the biosphere and the atmosphere (${\delta}_N$ and ${\delta}_M$, respectively) have been used to partition net fluxes of $CO_2$ and methane into the source and sink terms. The temporal variations of ${\delta}_N$ and ${\delta}_M$ were investigated at the same time in a Japanese rice paddy by combining stable isotopes and concentration measurements within and above the canopy. There were close agreements between the measured concentrations and the ${\delta}^{13}C$ values of $CO_2$ and methane on both temporal and spatial scales. While atmospheric stability and environmental parameters influencing photosynthetic assimilation were the major controls on variability of [$CO_2$] and ${\delta}^{13}CO_2$, atmospheric stability was the predominant factor for driving changes in [$CH_4$] and ${\delta}^{13}CH_4$ profiles. We also found strong linear relationships between the measured isotopic compositions and the inverse of concentrations over the time spans of day, night, and whole day. The ${\delta}_N$ values determined on the two days contrasting in environmental conditions revealed that the relative contributions of photosynthetic assimilation and ecosystem respiration to the total $CO_2$ exchange did not change significantly. In contrast, the ${\delta}_M$ values showed a marked difference between the sampling dates, reflecting a transpiration-induced shift in methane transport.

Reduction of Threshold Voltage Hysteresis of MoS₂ Transistors with 3-Aminopropyltriethoxysilane Passivation and Its Application for Improved Synaptic Behavior

Han, Kyu Hyun,Kim, Gwang-Sik,Park, June,Kim, Seung-Geun,Park, Jin-Hong,Yu, Hyun-Yong American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.23

<P>Although molybdenum disulfide (MoS<SUB>2</SUB>) is highlighted as a promising channel material, MoS<SUB>2</SUB>-based field-effect transistors (FETs) have a large threshold voltage hysteresis (Δ<I>V</I><SUB>TH</SUB>) from interface traps at their gate interfaces. In this work, the Δ<I>V</I><SUB>TH</SUB> of MoS<SUB>2</SUB> FETs is significantly reduced by inserting a 3-aminopropyltriethoxysilane (APTES) passivation layer at the MoS<SUB>2</SUB>/SiO<SUB>2</SUB> gate interface owing to passivation of the interface traps. The Δ<I>V</I><SUB>TH</SUB> is reduced from 23 to 10.8 V by inserting the 1%-APTES passivation layers because APTES passivation prevents trapping and detrapping of electrons, which are the major source of the Δ<I>V</I><SUB>TH</SUB>. The reduction in the density of interface traps (<I>D</I><SUB>it</SUB>) is confirmed by the improvement of the subthreshold swing (SS) after inserting the APTES layer. Furthermore, the improvement in the synaptic characteristics of the MoS<SUB>2</SUB> FET through the APTES passivation is investigated. Both inhibitory and excitatory postsynaptic currents (PSC) are increased by 33% owing to the reduction in the Δ<I>V</I><SUB>TH</SUB> and the n-type doping effect of the APTES layer; moreover, the linearity of PSC characteristics is significantly improved because the reduction in Δ<I>V</I><SUB>TH</SUB> enables the synaptic operation to be over the threshold region, which is linear. The application of the APTES gate passivation technique to MoS<SUB>2</SUB> FETs is promising for reliable and accurate synaptic applications in neuromorphic computing technology as well as for the next-generation complementary logic applications.</P> [FIG OMISSION]</BR>

Simultaneous Determination of Carbon Isotopic Signatures of CO2 and Methane Exchanged Between the Paddy Ecosystem and the Atmosphere under Natural Conditions

Gwang Hyun Han,Young Bae Sim,Hisashi Yoshikoshi,Akira Miyata 한국응용생명화학회 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.6

[신진과학자 발표] Soil’s Contributions in CO₂and M ethane Gas Exchange Processes between Ground Paddy Ecosystem and the Atmosphere

Gwang Hyun Han(한광현),Hisashi Yoshikoshi(요시코시 히사시),Hedeyuki Nagai(나가이 히데유키),Tomoyasu Yamada(야마다 토모야스),Yoshikazu Kobayashi(코바야시 요시카즈),Keiske Ono(오노 케이스케),Masayoshi Mano(마노 마사요시),Akira Miyata(미야타 아키라) 한국토양비료학회 2007 한국토양비료학회 학술발표회 초록집 Vol.2007 No.10

Regional-Scale Evaluation of Groundwater Susceptibility to Nitrate Contamination Based on Soil Survey Information

Gwang-Hyun Han(한광현) 한국토양비료학회 2009 한국토양비료학회지 Vol.42 No.1

비점오염제어에 있어서 상대적으로 지하수오염의 가능성이 높은 지역을 선별하고 주된 오염원을 파악하는 것은 그 기여도가 대단히 크다. 이 연구는 제주도를 연구지역으로 하였으며, 현재 가장 중요한 오염물질 중의 하나인 질산태 질소를 대상오염물질로 하였다. 기존 및 실제 조사에 의한 토양정보를 토대로 pedotransfer function과 수분이동 모델을 이용하여 토양통별로 산출된 질산태질소오염 민감도 지수를 통해 민감도분포도를 작성하였으며(semi process-based 법), 이를 실제 모니터링된 2,020개의 수질자료와 비교하였고 제안된 semi process-based 법은 기존의 전문가의 의견과 판단에 의존하거나 방대한 파라메터를 요구하는 기존방법들의 단점을 극복하고 충분한 지형적 해상력을 제공하였을 뿐만 아니라, 알려진 질산태 질소 모니터링 자료와도 대부분 잘 부합하였다. 본 연구를 통해 얻어진 결과들은 오염민감성이 높은 지역을 우선 선정하여 주의와 관리대책을 세우는 동시에 주요한 오염원을 파악함으로써 지하수자원을 합리적이고 효율적으로 보호하는데 있어서 유용한 수단이 될 것으로 판단되었다. Susceptibility assessment of groundwater contamination is a useful tool for many aspects of regional and local groundwater resources planning and management. It can be used to direct regulatory, monitoring, educational, and policy-making efforts to highly vulnerable areas. In this study, a semi process-based was proposed to evaluate relative susceptibilities to groundwater contamination by nitrate on a regional scale. Numerical simulation based on data from each soil series was done to model water flow within soil profiles that were related to groundwater contamination by nitrate. Relative vulnerability indices for each soilseries were produced by manipulation of amount of leaching flux, amount of average water storage in a soil profile, and amount of average water storage change. These indices were designed to convey the trend of leaching flux and to maximize spatial resolution. The resulting vulnerability distribution map was used to locate highly vulnerable sites easily with an appropriate grouping the indices, and was then compared with those from groundwater nitrate concentrations monitored. An excellent agreement was obtained across nitrate concentrations from the highly vulnerable regions and those from the low to stable regions.

Transport of Urea in Waterlogged Soil Column : Experimental Evidence and Modeling Approach Using WAVE Model

Han, Gwang Hyun,Yoo, Sun Ho,Lee, Sang Mo,Park, Jung Geun,Han, Kyung Hwa 한국농화학회 2000 Applied Biological Chemistry (Appl Biol Chem) Vol.43 No.1

The main form of nitrogen fertilizer applied to lowland rice is urea, but little is known about its transport in waterlogged soil. This study was conducted to investigate the transport of urea in waterlogged soil column using WAVE (simulation of the substances Water and Agrochemicals in the soil, crop and Vadose Environment) model which includes the parameters for urea adsorption and hydrolysis. The adsorption distribution coefficient and hydrolysis rate of urea were measured by batch experiments. A transport experiment was carried out with the soil column which was pre-incubated for 45 days under flooded condition. The urea hydrolysis rate (k) was 0.073 h^(-1). Only 5% of the applied urea remained in soil column at 4 days after urea application. The distribution coefficient (K_d) of urea calculated from adsorption isotherm was 0.21 L ㎏^(-1), so it was assumed that urea was a weak-adsorbing material. The maximum concentration of urea was appeared at the convective water front because transport of mobile and weak-adsorbing chemicals, such as urea, is dependent on water convective flow. The urea moved down to 11 ㎝ depth only for 2 days after application, so there is a possibility that unhydrolyzed urea could move out of the root zone and not be available for crops. A simulated urea concentration distribution in waterlogged soil column using WAVE model was slightly different from the measured concentration distribution. This difference resulted from the same hydrolysis rate applied to all soil depths and overestimated hydrodynamic dispersion coefficient. In spite of these limitations, the transport of urea in waterlogged soil column could be predict with WAVE model using urea hydrolysis rate (k) and distribution coefficient (K_d) which could be measured easily from a batch experiment.