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.

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.

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.

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.

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.

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.

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.

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.

다문화와 축제, 그 경계를 넘어

안지현(An, ji-Hyun),김남조(Kim, Nam-Jo) 한국문화관광연구원 2016 문화정책논총 Vol.30 No.2

목표전개 기법을 적용한 차량개발 프로세스 및 환경개발

안지현(Ji Hyun An),유승원(Seungwon Yoo),박종찬(Jongchan Park) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.4