어촌을 활력 넘치는 공간으로 조성하기 위한 어촌지역 활성화 대책

최재용 한국지역개발학회 2021 한국지역개발학회 학술대회 Vol.2021 No.11

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.

DPSK 시스템에서 기저대역 신호처리를 이용한 주파수편이 보상 ( Compensating Frequency Drift in DPSK Systems via Baseband Signal Processing )

최재용,이용훈 한국통신학회 1995 한국통신학회 학술대회논문집 Vol.- No.-

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.

SNS(소셜네트워크 서비스)를 활용한 유통업체 온라인 마케팅 활성화 방안에 관한 연구

최재용 한국유통학회 2010 한국유통학회 학술대회 발표논문집 Vol.2010 No.5

스마트폰의 등장으로 인해 언제 어디서나 정보를 누구라도 손쉽게 전달하고 볼 수 있는 시대가 되었다. 주로 개인적 홍보나 생각의 나눔을 위한 도구로서 트위터를 사용해 왔지만 트위터 사용자의 증가와 그 사용속도의 증가 추세에 따라 기업들이 직원들에게 직접 스마트폰을 제공하고 자신의 회사를 알릴 수 있도록 하고 있다. 본 연구에서는 이런 SNS(소셜네트워크 서비스)를 활용한 유통업체 온라인마케팅 활성화 사례와 SNS(소셜네트워크 서비스) 활용 방안에 대해 연구해본다.

불안정지지면과 안정지지면에서의 코어 운동이 20대 정상 성인의 체성분 변화에 미치는 영향

최재용 대한스포츠물리치료학회 2020 정형스포츠물리치료학회지 Vol.16 No.1

Purpose: The purpose is to examine the influence of changes in body components due to the movementof core muscles on the unstable support surface and the stable support surface. Methods: The study consisted of 12 healthy adults. Two groups were randomly selected. The flank and bridgeexercises were carried out on the unstable support surface and the stable support surface. Body-X balancetool was used to create an unstable support surface. The exercise intensity and time were progressivelyincreased every week. Results: There was a significant difference in body weight of the group using the stable support surface(p<.05). However, there was no significant difference elsewhere. There was no significant difference in bodyweight, fat mass and skeletal muscle mass of the group using the unstable support surface (p>.05). Therewas a significant difference in body weight between the groups (p<.05). However, there was no significantdifference in body fat mass and skeletal muscle mass between the two groups. Conclusion: According to the results, significant differences were found only in body weight after performingexercises on stable support ground while there was no significant differences in body weight, fat mass andskeletal muscle mass on unstable support. Although there was no significant changes in the body compositionafter conducting interventions, a decrease trend of body weight was found. Therefore, it will be necessaryto study with more than three-week intervention periods in the future studies, related to core exercise andbody composition.

목초액의 급여가 이유자돈의 분 중 미생물과 가스성상에 미치는 영향

최재용,Prashant Shinde,권일경,송영한,채병조 강원대학교 동물생명과학연구소(구 강원대학교 동물자원공동연구소) 2007 동물자원연구 Vol.18 No.-

Two experiments were conducted to determine the effect of wood vinegar (WV) on the fecal microbes and gas emission in weaned pigs. In Exp. 1, 224 weaned piglets (L×Y×D, 21 d-old, initial BW 6.02 ± 0.52 kg) were assigned to four treatments of different WV levels in randomized completely block design with four replicates (14 piglets/pen) for 28 days, including phases I (0-2 wk) and phase II (3-4 wk). The dietary treatments were 0, 0.1, 0.2 and 0.3% of WV added to a corn-soybean meal basal diet. The concentration of ammonia measured at 0 h and 24 h in feces did not differ among dietary treatments (p>0.05), but it was linearly decreased (p<0.05) in 0.2% and 0.3% addition level measured at 48 h and 72 h. The concentration of hydrogen sulfide had no significant change (p>0.05) within treatments measured at different time. The fecal total bacteria (TBC), Lactobacilli(LAB) and E. coli were measured on 14 d and 28 d. TBC were higher (p>0.05) in WV added treatments than the control. Similar results were obtained for LAB. But E. coli populations were decreased (p<0.05) in treatments added WV compared to control measured on 14 d and 35 d. In Exp. 2, 288 weaned piglets (L×Y×D, 21 d-old, initial BW 6.62 ± 0.31 kg) were assigned to four treatments in a randomized completely block design with four replicates (18 piglets/pen) for 28 days. The dietary treatments were basal diet (negative control, NC), 0.2% organic acid (positive control, PC), 0.2% antibiotic (AT) and 0.2% WV added to a corn-soybean meal basal diet. The fecal total bacteria (TBC), Lactobacilli(LAB) and E. coli were measured on 14 d and 28 d. TBC, LAB and E. coli showed lower counts in pigs fed AT diets than others. In conclusion, these results indicated that wood vinegar could reduce the NH3 concentration of feces and inhibited the growth of harmful bacteria.

소셜네트워크서비스(SNS) 활용을 통한 전통시장 활성화방안에 관한 연구

최재용 한국유통학회 2011 한국유통학회 학술대회 발표논문집 Vol.2011 No.11

중국의 청소년소설들 ― 『삼중문』과 『모텔의 도시』 비교 연구

최재용 한국중국현대문학학회 2015 中國現代文學 Vol.0 No.74

This is a comparative study on two novels: Han Han’s Triple Door and Zhang Jinghong’s City of Motels. Between these two novels, we can find many similarities: main characters are very alike, their contempt and distrust toward the educational system is explicit, parents and teachers are either indifferent or incompetent, etc.. One can easily regard these novels as “bildungsroman” or “initiation story,” but I suggest the term of “young adult novel” is more proper category, as the modern theme of education and socialization, which were substantial in “bildungsroman,” are not essential in these two “young adult novel.” By comparing and analysing these novels, I tried to explain how ‘young adult novel’ in mainland China and Taiwan have been developing throughout the Cold War and post Cold war era.

한한이 촉발한 문학논쟁과 그 문학사적 의미

최재용 한국중국현대문학학회 2012 中國現代文學 Vol.0 No.61

This article analyses two most prominent literary debates initiated by famous(notorious) young writer, Han Han. These debates show how a profound change is taking place in contemporary Chinese literary field. First, the Han-Bai debate. In 2006, a famous literary critic, Bai Ye posted a blog, in which he insisted that the literary works of ‘80hou' are still immature. After reading this, Han posted a blog which included lots of coarse language, and insisted that literature belongs to everyone, that the so-called literary professionals such as Bai had no right to judge other people's literary achievements. Second, the attack on the literary ‘Masters'. In an conversation held by a TV broadcast, he criticised the writing skills of three literary masters of modern China, Mao Dun, Ba Jin, and Bing Xin. Lots of people reacted, and Han reacted back, saying he had the right to freely express his own view on literature. These two debates both show the collision between the traditional literary power and the newer, more democratic one. The fast growth of internet, and the marketizing of literature made literature more open to the public. Like it or not, we have to give this change a cool-headed assessment.