TANK 모형 매개변수 추정을 위한 회귀식 개발

안지현,송정헌,강문성,송인홍,전상민,박지훈,An, Ji Hyun,Song, Jung Hun,Kang, Moon Seong,Song, Inhong,Jun, Sang Min,Park, Jihoon 한국농공학회 2015 한국농공학회논문집 Vol.57 No.4

The TANK model has been widely used in rainfall-runoff modeling due to its simplicity of concept and computation while achieving forecast accuracy. A major barrier to the model application is to determine parameter values for ungauged watersheds, leading to the need of a method for the parameter estimation. The objective of this study was to develop regression equations for estimating the 3th TANK model parameters considering their variations for the ungauged watersheds. Thirty watersheds of dam sites and stream stations were selected for this study. A genetic algorithm was used to optimize TANK model parameters. Watershed characteristics used in this study include land use percent, watershed area, watershed length, and watershed average slope. Generalized equations were derived by correlating to the optimized parameters and the watershed characteristics. The results showed that the TANK model, with the parameters determined by the developed regression equations, performed reasonably with 0.60 to 0.85 of Nash-Sutcliffe efficiency for daily runoff. The developed regression equations for the TANK model can be applied for the runoff simulation particularly for the ungauged watersheds, which is common for upstream of agricultural reservoirs in Korea.

고객의 미쉐린가이드 선정 레스토랑 선택에 대한 현상학적 연구

안지현,An, Ji-Hyun 한국급식외식위생학회 2022 급식외식위생학회지 Vol.3 No.1

With the increased development of the dining sector, several restaurants have emerged and are becoming more advanced. Since the Michelin Guide Seoul publication in Korea, the fine-dining market has attracted attention from guests. Moreover, the number of customers visiting fine-dining restaurants has increased comparatively. However, it has been a mere 6 years since the publication of the Michelin Guide Seoul, and domestic materials and research related to the Michelin Guide are insufficient. Therefore, this research examines the factors responsible for restaurants to gain Michelin stars, and the effect of the Michelin guide on customers to select restaurants. Customers who have visited and experienced the star restaurants were interviewed, as well as the owner chefs and personnel managing the restaurant. The interviews were conducted from August to September 2020 using the Colaizzi method. The survey was designed to extract meaningful sentences or phrases from the participant interviews, categorize general and abstract statements into topic clusters, and describe the essential experience. This research aimed to determine the effect of the Michelin guide on customers for a selection of the restaurants and star restaurants. It is important to understand the development of Michelin restaurants and the effective factors which make customers choose the restaurants. Also, results of this study will be a future guide for the possibility of developing domestic fine-dining restaurants, normal restaurants, and the food service industry.

인공신경망 기법을 이용한 논에서의 지표 유출량 산정

안지현,강문성,송인홍,이경도,송정헌,장정렬,Ahn, Ji-Hyun,Kang, Moon-Seong,Song, In-Hong,Lee, Kyong-Do,Song, Jeong-Heon,Jang, Jeong-Ryeol 한국농공학회 2012 한국농공학회논문집 Vol.54 No.4

The objective of this study was to estimate surface runoff from rice paddy plots using an artificial neural network (ANN). A field experiment with three treatment levels was conducted in the NICS saemangum experimental field located in Iksan, Korea. The ANN model with the optimal network architectures, named Paddy1901 with 19 input nodes, 1 hidden layer with 16 neurons nodes, and 1 output node, was adopted to predict surface runoff from the plots. The model consisted of 7 parameters of precipitation, irrigation rate, ponding depth, average temperature, relative humidity, wind speed, and solar radiation on the daily basis. Daily runoff, as the target simulation value, was computed using a water balance equation. The field data collected in 2011 were used for training and validation of the model. The model was trained based on the error back propagation algorithm with sigmoid activation function. Simulation results for the independent training and testing data series showed that the model can perform well in simulating surface runoff from the study plots. The developed model has a main advantage that there is no requirement for any prior assumptions regarding the processes involved. ANN model thus can be a good tool to predict surface runoff from rice paddy fields.

양축 정렬된 니켈기판의 표면 산화반응 연구

안지현,김병주,김재근,김호진,홍계원,이희균,유재무,Ahn Ji-hyun,Kim Byeong-Joo,Kim Jae-Geun,Kim Ho-Jin,Hong Gye-Won,Lee Hee-Gyoun,Yoo Jai-Moo,Pradeep Halder 한국초전도학회 2005 Progress in superconductivity Vol.7 No.1

We investigated the surface oxidation behavior of cube-textured polycrystalline nickel at various oxidation conditions. Cube-textured NiO film was formed on a cube-textured polycrystalline nickel regardless of oxidation conditions but different growth behavior of NiO crystals was observed depending on the oxidation conditions. The introduction of water vapor into $O_2$ did not affect the texture evolution, but rough and porous microstructure was developed. Microstructure of NiO film tends to be denser as the oxygen partial pressure increases. It is interesting that (111) peak of theta - two theta diffraction pattern started to get stronger in air atmosphere and (111) plane became the major texture in the substrate oxidized in high purity argon gas. Small amount of high index crystallographic plane NiO peak crystal was observed when $N_{2}O$ was used as an oxidant while only (200) plane crystal was formed in dry $O_2$ atmosphere. Flat and smooth surface was changed into rough faceted one when ramping rate to oxidation temperature was faster. The grain size of NiO was decreased when the oxygen partial pressure was low. It was also observed that the modification of nickel surface suppressed the development of (200) texture.

비공개 기록의 관리와 활용에 관한 연구

안지현,Ahn, Ji-Hyun 한국기록학회 2006 기록학연구 Vol.0 No.13

정보제공에 대한 공공기관의 대응은 기록관리의 정비가 정보공개제도의 시행에 앞서 실천되어야 할 중요한 과제라는 것을 확인시켜 주었다. 특히, 주요 정보가 포함된 기록에 대한 공공기관의 정보 부존재, 비공개 및 비밀 처분의 남발은 공공기관에서의 기록관리에 대한 전반적인 의식변화는 물론 비공개나 비밀로 관리되는 기록에 대한 근본적인 개선이 시급함을 보여주었다. 본 연구는 이러한 문제의식에 근거하여 현재의 비공개 및 비밀기록 관리의 실태를 검토하고 이에 대한 개선방안을 제안하였다. 지금까지 비공개 및 비밀기록에 대한 연구는 법적,행정적 관점에서만 논의가 진행되어 주로 제도적인 측면만이 부각되었다. 그러나 이러한 논의는 비공개 및 비밀기록의 문제에 대한 본질적인 접근이 되지 못하는 한계가 있다. 비공개 및 비밀로 분류되는 정보는 결국 기록이 생산되는 시점부터 관리까지의 모든 프로세스가 합리적으로 수행되어야만 근본적인 개선이 이루어 질 수 있기 때문이다. 따라서 본 연구에서는 우리의 기록관리체계가 처리과, 자료관, 전문관리기관이라는 세 단계로 구분되어 기록의 라이프사이클 흐름을 적용하여 관리할 수 있는 방식을 취하고 있는 만큼 이러한 단계에 따라 비공개 및 비밀기록의 생산부터 활용에 이르기까지의 전반적인 문제를 살펴보고 그에 대한 개선방향을 제시하였다. The response of public organizations on information offerings has affirmed that the arrangement of the management of records is an important project to be implemented ahead of the enforcement of the information disclosure system. In particular, the absence or non-disclosure of information of public organizations on records containing significant information and abuse of the secret disposition of information has demonstrated that it is imperative to improve radically the management of secret or non-disclosed records as well as overall changes of awareness. This study reviewed the reality of the current non-disclosure and management of confidential records based on the awareness on such records and proposed improvement measures. The study on non-disclosed and confidential records has been discussed from legal and administrative perspectives so that the main focus has been on the institutional aspect. Yet, there is a limitation on such discussions in that there cannot be fundamental access to issues of non-disclosed and confidential records. That is because the management of information classified as non-disclosed and confidential can be improved fundamentally when all processes from the production of the records to their management are carried out reasonably. Accordingly, since our record management system is divided into three phases of the disposition division, record center, and archives and takes a management record by being applied to the flow of the life cycle of records, we have reviewed overall issues from the production of non-disclosed and confidential records to the utilization of the records pursuant to these steps and offered directions for improvement.

축분종류에 따른 가축분퇴비의 화학성분 특성분석

안지현,송인홍,강문성,Ahn, Ji-Hyun,Song, In-Hong,Kang, Moon-Seong 한국농공학회 2013 한국농공학회논문집 Vol.55 No.2

The aim of this study was to investigate chemical characteristic of livestock compost in association with livestock manure types (poultry, cattle, swine, and mixed manure). The livestock compost was collected from local nonghyup branches on a si-gun level. Chemical composition (nutrients, heavy metals etc.) of the samples was analyzed and Pearson's correlation analysis was performed. Quality of most compost samples met the standard of fertilizer specifications. Poultry compost contains greater nutrients especially $P_2O$ (p-value<0.01) and $NH_4$-N (p-value<0.05). Meanwhile swine compost has higher concentration in water content (p-value<0.05) and heavy metals (p-value<0.01 for Cd, Cu and Zn). Overall, poultry compost was correlated positively with nutrients while swine compost has positive correlation with water content and heavy metals. We expect that the study results can provide base data for determining compost types and amount for crop production.

슬와 동맥 손상을 동반한 슬관절 탈구에서 혈관내 중재술 후 시행한 수술적 치료 - 증례 보고 -

안지현,김상길,Ahn, Ji Hyun,Kim, Sang Kil 대한정형외과스포츠의학회 2011 대한정형외과스포츠의학회지 Vol.10 No.2

발생 빈도가 높진 않지만, 슬관절 탈구 시 슬와 동맥 손상이 종종 동반된다. 발견된 모든 동맥 손상에 대한 치료의 필요성이 보고되어 왔으며 관혈적 수술이 보편적인 방법으로 알려져 왔다. 슬관절 탈구에 동반된 슬와 동맥 손상에 대하여 혈관내 중재술로 혈류를 회복하고 이후 손상된 인대에 대한 수술적 치료를 시행한 1례를 보고하고자 한다. Although uncommonly encountered, knee dislocation is frequently associated with popliteal artery injury. It has been reported that all detected arterial injuries warrant intervention and open surgical management is the standard of treatment. We report here on a case of endovascular intervention for popliteal artery injury in knee dislocation, and then this was treated with ligament surgery with arthroscopic and open procedure.

퇴비의 화학성분 및 대장균 분포 특성 분석

안지현 ( Ji-hyun Ahn ),송인홍 ( In-hong Song ),강문성 ( Moon-seong Kang ),전상민 ( Sang-min Jun ) 한국농공학회 2012 한국농공학회 학술대회초록집 Vol.2012 No.-

현재 유기성 폐기물의 퇴비 재활용 및 친환경 농업에 대한 관심이 증가함에 따라 유기성분이 많은 축산 분뇨를 부산물 비료로 활용하는 사례가 증가하고 있다. 퇴비는 오염물질 및 병원성 미생물을 잠재적으로 함유할 수 있어 퇴비사용에 대한 안정성을 확보하기 위해서는 퇴비의 생·화학적 특성분석이 필요하다. 이에 본 연구의 목적은 현재 상용되고 있는 퇴비의 화학성분 및 대장균 농도 등을 조사·분석하고, 원재료와 지역에 따라 퇴비성분을 특성화하는 데 있다. 퇴비는 농협 및 부산물비료협회에서 제공하는 원료별, 생산량별 분포를 참고하여 도 단위로 시·군에 유통되는 퇴비를 적게는 5개, 많게는 8개씩 수집하였다. 수집된 퇴비시료의 약 2kg 정도를 서울대학교 농업과학공동기기센터(NICEM)에 영양물질 (N, P, K), 유기물함량, 주요 중금속 및 대장균 분석을 의뢰하였으며, 현재 화학성분과 대장균은 분석 중에 있다. 향후 분석된 자료를 활용하여 원료별, 지역별로 화학성분 및 대장균수에 대한 상관분석을 실시할 것이며, 본 연구 결과는 안정적인 퇴비사용을 위한 기초자료가 될 수 있을 것으로 기대된다.

열처리에 의한 14K, 18K yellow gold alloy의 경도 향상 및 표면 결함 완화

안지현(Ji-Hyun Ahn),서진교(Jin-Kyo Seo),안용길(Yoeng-Gil Ahn),박종완(Jong-Wang Park) 한국표면공학회 2010 한국표면공학회지 Vol.43 No.2

In this study, we conducted heat treatment on 14K, 18K yellow gold alloy at various temperature conditions for improving their hardness and moderating their surface defects. Also after the heat treatment we used EPMA (Electron Probe Micro Analyzer), XRF (x-ray Fluorescence spectroscopy) for qualitative analysis and OM (optical microscope), SEM (scanning electron microscope) to investigate the changes of surface grain boundary. We used Vickers hardness tester to verify the changes of hardness. After the heat treatment, 14K, 18K gold alloys showed improved hardness and moderated surface defects at specific temperatures and duration.

북한이탈주민에서 우울 증상과 회복탄력성의 관련성

안지현(Ji Hyun An),이경은(Kyoung Eun Lee),이효철(Hyo Chul Lee),전진용(Jin Yong Jun),김해수(Hae Soo Kim),홍진표(Jin Pyo Hong) 대한사회정신의학회 2017 사회정신의학 Vol.22 No.2

연구목적 : 본 연구에서는 북한이탈주민들을 대상으로 사회 인구학적 변수의 특징에 따른 우울 증상 및 회복탄력성과 관계, 우울 증상과 회복탄력성 사이의 상관 관계를 알아보고자 하였다. 방 법 : 본 연구에서는 전국 하나센터에 등록한 북한이탈주민 300명을 대상으로 자가 설문을 작성하도록 하였다. 북한어판 CES-D, CDRISC와 BRS를 통한 사회인구학적 변수 및 회복탄력성을 측정하여 각 변인들을 측정하였으며, 사회인구학적 특성들과 우울증상 또는 회복탄력성 점수와의 관련성을 알아보기 위해 t-test와 Pearson 상관분석을 시행하였다. 결 과 : 연구에 참여한 북한이탈주민들 중 여성(p=0.002), 저소득(p=0.007), 무직(p=0.017), 지난 일년간 건강문제가 있었던 경우(p<0.001) 우울 증상의 점수가 유의하게 높았다. 또한 CD-RISC로 측정한 회복탄력성 점수는 여성(p=0.049), 입국 후 기간이 1년 이상(p= 0.042), 그리고 미혼인 경우(p=0.021) 유의하게 낮은 것으로 나타났다. 우울증상은 회복탄력성 점수 각각 (CD-RISC;r=-0.257, p< 0.001, BRS;r=-0.409, p<0.001)과 모두 통계적으로 의미 있는 부적 상관관계를 보였다. 결 론 : 본 연구에서는 북한이탈주민에서 우울 증상의 심각도와 회복탄력성 사이에 부적인 상관관계가 있다는 것을 확인하였다. 이를 근거로 향후 북한 이탈주민들의 우울증상을 감소시키기 위해서 회복탄력성을 증진시키는 개입이 필요할 것으로 생각된다. Objectives : The aim of this study was to examine the characteristics of socio-demographic variables and the correlation with depressive symptoms and resilience in North Korean defectors. Methods : The study subjects were 300 North Korean defectors registered in regional adaptation center (Hana Center) in South Korea. Participants reported self- questionnaires including socio-demographic variables, which consider the sociocultural background of North Korea and the following self-rating scales : North Korean version of Center for Epidemiological Studies-Depression Scale;CES-D-NK, Connor-Davidson Resilience Scale; CD-RISC, and brief resilience scale. Results : Female (p=0.002), low income state (p=0.007), no occupational state (p=0.017), and presence of health problems over the past year (p<0.001) showed significantly high depression score in North Korean defectors. Only female gender (p=0.049), longer period after entry (p=0.042) and unmarried status (p=0.021) showed lower resilience score of CD-RISC. When correlation analysis were performed, depressive symptoms showed significant negative correlation with resilience score both in CD-RISC (r=-0.257, p<0.001) and Brief resilience scale (r=-0.409, p<0.001). Conclusion : Severity of depressive symptoms and low resilience are highly correlated in North Korean defectors. Future interventions should focus on improving resilience to decrease depressive symptoms in defector groups.