농업인의 재배작물 선정에 영향을 미치는 요인에 관한 연구 - 강원도 인제군을 사례로 -

최재용,김창환,배선학,이동준,임경재,Choi, Jae-Yong,Kim, Chang Hwan,Bae, Sun Hak,Lee, Dongjun,Lim, Kyoung Jae 한국농공학회 2017 한국농공학회논문집 Vol.59 No.2

Farmers seek for high profitability by increasing the best use of land, and the selection of crops is the first and basic way to achieve their goals. When farmers select crops, the climate, price and productivity of crops are usually considered at the first stage. However, a crucial factor is to understand general characteristics of soils where the crops were grown, but many farmers are lacking in detailed knowledge about soils. The purpose of this study is to search and analyses factors based upon related soil and others in decision-making for the selection of crops. In result, the cultivated rate of the top 5 corps in the suitable areas for cultivation (SAC) is only 53 % which shows most farmers are plants their crops in unsuitable sites. To examine factors influencing on the selection of crops except for soils, surveys about their farm characteristic and Korea Soil Information System (KSIS) were conducted. The result of survey shows 20 % of farmers know KSIS. To increase that rate, there were many changes on soil's characteristic, and at the same time, climate conditions should be updated. It can be expected to increase the rate of farmers' utilization of KSIS.

최소자승법을 이용한 해저고정형 선배열 센서의 3차원 배열형상 추정기법 연구

최재용,손권,Choi, jae-Yong,Son, Kweon 한국음향학회 2004 韓國音響學會誌 Vol.23 No.5

본 논문에서는, 미지 위치의 원거리 능동음원을 이용하여 해저고정형 선배열 센서에 대한 3차원 배열형상추정 기법을 제안하였다. 본 연구는 센서에 도달하는 음파가 평면파라는 가정 하에 기준센서와 나머지 센서간의 음파도달 시간지연, 센서위치 및 입사각과의 선형방정식의 해를 반복적 최소자승법에 의해 구함으로서 센서위치 추정이 가능하다. 제안된 기법의 타당성을 검증하기 위해 컴퓨터 시뮬레이션과 실제 해상실험을 수행하였으며, 이론적 분석을 통하여 음원 위치 분포에 따른 성능 및 시간지연 오차에 따른 센서위치 추정 성능을 분석하였다. This paper proposes an algorithm that estimates three dimensional array shape calibration about the bottom-mounted sensor array. under the assumption that the active sources are in the far-field with unknown positions. Under some assumptions. we calculate the sensor positions via an algebraic solutions of a least squares problem that the linear equations are related to the sensor positions and directions or arrival. We give examples of algorithm performance from both computer simulations and sea test. We also illustrate the performance of sensor positions estimation as a function of time delay estimation variance and the distribution of the localizing sources.

주파수 대역별 수중 순간소음 음원준위 산출 기법

최재용,오준석,이필호,Choi, Jae-Yong,Oh, Jun-Seok,Lee, Phil-Ho 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.4

This paper describes a calculation method of source level of a ship transient noise, which is one of the important elements for the ship detection. Aim of transient noise measurements is to evaluate of acoustic energy due to singular occurrence, which is therefore defined as non-periodic and short termed events like an attack periscope, a rudder and a torpedo door. In generally, in the case of randomly spaced impulse, the spectrum becomes a broadband random noise with no distinctive pattern. Therefore, frequency analysis is not particularly revealing for type of signal. In the paper, it is performed in time domain to analyze a transient noise. However, a source level of transient noise is required an investigation for multiple frequency band. So, in order to calculate a source level of transient noise, a design of exponential weighting function, convolution, band pass filtering, peak detection, root mean square, and parameter compensation are applied. The effectiveness of this calculation scheme is studied through computer simulations and a sea test. Furthermore, an application of the method is applied in a real case.

수직선배열을 이용한 저소음 함정음향 측정 및 분석기법

최재용,손권,도경철,Choi, Jae-Yong,Son, Kweon,Dho, Kyeong-Cheol 한국군사과학기술학회 2003 한국군사과학기술학회지 Vol.6 No.2

Underwater acoustic noise measurement is an essential element for vulnerability assessment of modern naval platforms. But during the last few decades environmental conditions have drastically changed due to the gradually increasing sea ambient noise level and decreasing submarine radiated noise level. A real-time underwater acoustic measurement system with vertical line array is designed for the quiet submarine radiated noise assessment in challenging environment. This system has a constant directivity index in measurement frequency range and accurate tracking capability for the transmission loss compensation and navigation aids inside the submarine. This system has been validated at sea and used several times for the submarine noise measurement.

수중음향신호 입사방위 추정을 위한 RLSLTDE 알고리즘

최재용,손권,도경철,Choi, Jae-Yong,Son, Kweon,Dho, Kyeong-Cheol 한국음향학회 2000 韓國音響學會誌 Vol.19 No.5

수중음향 측정 및 수동형 탐지에서는 표적 방사음향의 방위 탐지가 매우 중요하다. 표적의 방사음향이 다수 개의 청음 센서에 수신되면서 각 센서마다 시간적으로 지연되어 도달한다. 이와 같은 시간지연을 추출함으로서 표적 방위 추출이 가능하다. 본 연구에서는 시간지연 추정을 위해 RSSL 적응필터를 이용한 새로운 RLSLTDE 알고리즘을 제안한다. RLSLTDE는 표적 방사음향에 대한 정보가 제한적이거나 추정하려는 시간지연 정보가 시변인 경우에 효율적이다. 신호대 잡음비에 따른 시뮬레이션에 결과, 기존 LMS 적응필터 알고리즘 보다 수렴특성 및 시간지연추정 속도면에서 우수하여 제안 알고리즘이 수중음향 입사방위 추정에 유용함을 확인하였다. The bearing detection of radiated target noise is very important at underwater acoustic measurement and passive detection. It differs the arrival tines of received signal at each sensor. Therefore, the bearing can be obtained from the time delay. This paper proposes a new algorithm using the RLSL adaptive filter for TDE. The proposed method is particularly attractive when there is a limitation of priori information about the received signal spectra and when the delay is subject to variation. As the simulation results, it is shown that the proposed algorithm has better convergence characteristics and TDE speed, and so that the usefulness of proposed algorithm is confirmed.

다중 임계치 함수의 TI 웨이브렛 잡음제거 기법

최재용,Choi, Jae-Yong 한국음향학회 2006 韓國音響學會誌 Vol.25 No.7

수중 방사소음 측정시 낮은 신호대 잡음비를 가지는 신호에 대해 유용한 신호를 얻기 위해서는 잡음제거가 이루어져야 한다. 본 논문은 잡음제거를 수행하기 위하여 Donoho 등에 의해 제안된 Translation-Invariant (TI) 웨이브렛 기반으로 다중 임계치 함수를 적용한 잡음제거 기법을 제안한다. 기존의 웨이브렛 잡음제거 기법은 특이점 부근에서 Pseudo-Gibbs 현상이 발생하는 문제점이 있다 TI 웨이브렛은 신호의 특성 위치를 변화시켜 Pseudo-Gibbs 현상을 제거한다. 그리고 배경잡음 및 외부잡음을 제거하기 위해 각 노드별 변형된 소프트 임계치를 적용한 다중 임계치 함수를 제안한다. 제안 기법의 타당성을 검토하기 위해 모의 시뮬레이션과 해상실험을 수행한 결과 신호대 잡음비가 23dB 및 18dB 이상 개선됨을 확인하였다. This paper proposes an improved do-noising method using multi-thresholding function based on translation-invariant (W) wavelet proposed by Donoho et al. for underwater radiated noise measurement. The traditional wavelet thresholding de-noising method causes Pseudo-Gibbs phenomena near singularities due to discrete wavelet transform. In order to suppress Pseudo-Gibbs Phenomena, a do-noising method combining multi-thresholding function with the translation-invariant wavelet transform is proposed in this paper. The multi-thresholding function is a modified soft-thresholding to each node according to the discriminated threshold so as to reject かon external noise and white gaussian noise. It is verified by numerical simulation. And the experimental results are confirmed through sea-trial using multi-single sensors.

자연환경보전,이용시설의 공간조성 사례 분석

최재용 ( Jae Yong Choi ),박소현 ( So Hyun Park ),이동근 ( Dong Kun Lee ) 한국환경복원기술학회 2005 한국환경복원기술학회지 Vol.8 No.1

CCTV 효과성 인식의 새로운 이론적 접근

최재용(Choi, Jae Yong),임하늘(Yim, Ha Neul),이윤호(Lee, Yun Ho) 경찰대학 경찰학연구편집위원회 2015 경찰학연구 Vol.15 No.4

CCTV의 실질적인 효과가 아닌 CCTV에 대한 효과성 인식 여부는 연구가 극히 제한적으로 이루어져왔다. CCTV에 대한 효과성을 어떻게 인식하는가는 CCTV 설치에 대한 용인성으로 나아간다는 점에서 매우 중요하다고 할 수 있다. 이 연구는 CCTV의 효과성 인식을 설명할 수 있는 이론적 근거를 탐색하고 경험적으로 이를 검증하는 것을 목적으로 한다. 이를 달성하기 위해 2010년 형사정책연구원에서 실시한 학교주변 환경설계를 통한 범죄예방에 관한 주민인식 조사를 활용해 위계적 회귀분석을 실시했다. 도구적 시각과 표현적 시각이라는 모델을 활용해 CCTV 효과성 인식에 실질적인 영향을 주는 요인들을 살펴본 결과, 두 모델 다 유의미하게 CCTV 효과성에 대한 인식에 영향을 미치는 것으로 나타났다. 그 중에서도 물리적 무질서 인식, 비공식적 통제에 해당하는 표현적 시각 모형의 설명값이 도구적 시각 모형 설명값보다 무려 3.6배 높게 나왔다. 이 연구는 CCTV의 효과성 인식을 설명할 수 있는 이론적 배경의 토대를 마련하고 CCTV와 같은 1세대 CPTED의 활용을 위해서는 지역사회를 함께 고려하는 2세대 CPTED가 더불어 중요함을 시사하는 연구결과를 밝힐 수 있었다는 점에서 의의가 있다. Despite the abundant research about CCTV, not much attention has been paid upon efficacy of CCTV and theoretical background. It is important to know how people perceive the efficacy of CCTV because this lead to acceptability of CCTV. The current study tried to find the theoretical background and examined empirically. To achieve this goal, the data was drawn from 2010『How to Institutionalize CPTED in Korea(Ⅲ) : Safer School and Safer Community by Korean Institute of Criminology. The analysis outcomes revealed that two models are all significantly related to the efficacy of CCTV. Among these variables, expressive perspective variables such as incivility, social efficacy showed seven times as high explanatory power as instrumental perspective variables. The current study has value when it comes to working out on new theoretical background and trying to examine it. In addition, it showed how much important it is to consider 2nd generation CPTED with 1st generation CPTED altogether.

방아쇠 수지에 대한 한의학적 치료 연구 동향 분석

최재용 ( Jae-yong Choi ),이상건 ( Sang-gun Lee ),김호 ( Ho Kim ),유상준 ( Sang-joon Yoo ),강동협 ( Dong-hyeob Kang ),이도훈 ( Do-hoon Lee ),최기원 ( Ki-won Choi ),이유진 ( Yu-jin Lee ) 한방재활의학과학회 2021 한방재활의학과학회지 Vol.31 No.4

Objectives The purpose of this review is to analyze the trends of Korean medicine treatment for trigger finger. Methods Clinical papers using Korean medicine to treat trigger finger were searched in five online databases―Koreanstudies Information Service System, Oriental Medicine Advanced Searching Integrated System, ScienceON, Research Information Sharing Service, and PubMed. Nine studies were selected, and we analyzed their characteristics according to the author, year, number/gender/age of patients, duration of disease, duration of treatment, intervention method, measurement methods, and results. Results Seven case report studies, one prospective observational study, and one randomized controlled trials (RCTs) were selected in online databases, and there were no review studies. The most frequently used therapies were pharmacopuncture and acupuncture treatment. visual analogue scale, Quinnell's classification of triggering, was frequently used for measurement methods. All nine studies had therapeutic effects. Conclusions We reviewed studies of Korean medicine treatments for trigger finger, in this study. However, there are limitations that seven of the nine selected papers were case papers, and the number of papers was small. This paper suggests that a higher level of research and more studies on Korean medicine treatments of trigger finger need to be conducted. (J Korean Med Rehabil 2021;31(4):65-74)

디지털 미디어에서 일러스트레이션의 위상

최재용(Choi Jae Yong) 한국일러스아트학회 1998 일러스트레이션학 연구 Vol.3 No.-

In digital media fields, illustration is searching the developmental change in artistic procedures for mutual working computes program. This suggest the possibility that all of artist in this fold is origanally river been figured in old time stage. Therefore, art and science should be controlled in a ruled system, the artist, viewer and computer would be a mutual cooperative relationship. However, the digital media requires basical drawing capacity, and suggestion the endless possibility.