항만내 파랑응답과 계류선박의 운동해석

조일형,홍길표,최항순 한국해안해양공학회 1991 학술강연회 발표논문초록집 Vol.1 No.1

순환식반응기에서 TiO2/UV 및 TiO2/태양광시스템을 이용한 E. coli의 광촉매 살균의 영향

조일형,문일영,정문호,이홍근,조경덕 한국물환경학회 ( 구 한국수질보전학회 ) 2000 공동 추계학술발표회 Vol.2000 No.-

음식물쓰레기에서 발생된 바이오가스를 전기에너지로 전환에 따른 확률론적 수익성 분석 및 기대효과

조일형,김재우 대한환경공학회 2008 대한환경공학회 학술발표논문집 Vol.2008 No.12

점성 효과에 의한 경사진 방파제 입구에서의 토사 이동에 관한 연구

조일형,공도식,Cho, I. H.,Gong, D. S. 한국항해항만학회 1992 韓國港灣學會誌 Vol.6 No.2

Herein we investigate the mass transport velocity caused by the viscosity near the ocean structure such as circular pile and inclined breakwaters. The mass transport velocity which is represented by the sum of the Eulerian velocity and the stokes drift were derived by Carter, Liu and Mei(1973). The tangential components of the inviscid velocity field at the bottom needed in the calculation of the mass transport velocity is obtained by solving the scattering problem due to breakwaters. The matched asymptotic expansion technique is employed to obtain the inviscid flow fields scattered by inclined breakwaters. The numerical results show that heary sediments tends to be deposited near the center of breakwaters and that the narrowing of the entrance width results in reduction of the magnitude of mass transport.

N개의 투과성 원기둥 배열에 의한 파랑제어

조일형 한국해안해양공학회 2003 한국해안해양공학회 논문집 Vol.15 No.4

3차원 선형포텐셜 이론아래에서 해저면 바닥에 고정된 N개의 투과성 원기둥과 입사파의 상호작용 문제를 살펴보았다. 유체영역을 때의 외부영역과 N개의 내부영역으로 나누고, 각 유체영역에서의 회절포텐셜을 고유함수전개법에 의해 표현하였다(Williams and Li, 2000). 투과성 구조물은 파력과 처올림 파형을 크게 줄일 수 있다는 사실을 해석결과는 보여주고 있다. 개발된 해석모델을 검증하기 위하여 일렬로 배열한 투과성 원기둥들을 가지고 조파수조(30m × 7m × 1.5m)에서 체계적인 모형실험을 수행하였다. 해석결과와 모형실험결과는 정성적으로 잘 일치하고 있음을 확인하였다. 투과성 원기둥을 일렬로 배열하여 만든 방파제는 해수교환뿐 아니라 우수한 소파성능을 가지고 있어 미래의 해수교환방파제로써 무한한 잠재력이 있다고 판단된다. The interaction of incident monochromiatic waves with N bottom-mounted porous circular cylinders is investigated in the frame of three-dimensional linear potential theory. The fluid domain is divided into N+l regions i.e. a single exterior region and N interior regions, and the diffraction potential in each fluid region is expressed by an eigenfunction expansion method (Williams and Li,2000). The analytic results show that the porous structure reduces both the wave forces and the run-up wave around the cylinder. To verify the developed model, the systematic model test with a line array of porous cylinders is conducted at the wave tank (30m×7m×1.5m). The analytic results are in good agreement with the experimental results within measured frequency range. It is concluded that the breakwater constructed with an array of porous circular cylinders shows the performance of an effective wave barrier together with the seawater-exchange effect and is considered to have vast potentials for the use of seawater-exchanging breakwater in the future.

철 석출장치에 의한 폐수 중의 인 제거 특성

조일형,조경덕,안상우,장순웅,김영규,Cho Il-Hyoung,Zoh Kyung-Duk,An Sang-Woo,Chang Soon-Woong,Kim Young-Kyu 한국환경보건학회 2006 한국환경보건학회지 Vol.32 No.1

This study was conducted to improve an effect of phosphorus removal using FNR(Ferrous Nutrient Removal) process which had iron precipitation reactor and to analyze the iron corrosion. For simultaneous removal of phosphorus, iron electrolysis was combined with oxic tank. In this study, The removal efficiency of phosphorus increased with an increase voltage in iron precipitation reactor. The distance of 15mm between the two iron bed in each tests influence the concentration of remaining phosphorus most. The extensive surface area of iron bed is the more removes the phosphorus. In this test the $400\;cm^2$ of surface area was proved to be the most removal efficient.

개인정보보호 프로그램의 타당성 조사를 위한 비용효과분석 사례 연구

조일형,김진,유진호 한국경영정보학회 2019 한국경영정보학회 학술대회논문집 Vol.2019 No.5

일제강점기 안규용의 『풍악산유람기』 고찰

조일형 영산대학교 동양문화연구원 2022 동양문화연구 Vol.37 No.-

This study examines 『Pungak Mountain Travelogue(楓嶽山遊覽記)』 by Hoebong Ahn Gyu-yong (安圭容, 1873-1959), which has not been known until now. Ahn Gyu-yong was a student of Song Byeong-seon (宋秉璿, 1836-1905). He built Jukgokjeongsa school in Jinbong, Boseong in 1921 in pursuit of study. He is a Confucian scholar who exerted influence in the Boseong area, as he protested against Japan during the Japanese colonial period, resulting in being detained for three months in Gurye and Gwangju. 『Pungak Mountain Travelogue』 is a travelogue written by Ahn Gyu-yong in 1933 when he toured Mt. Geumgang on his 60th birthday. In the 1930s, with the development of rail transport, the era of mass tourism to Mt. Geumgang began. Confucian scholars in Boseong also joined the trend and went on a tour of Mt. Geumgang to commemorate the special day called 'Hoegap' (60th birthday). People who accompanied Ahn Gyu-yong include Im Gi-hyeon·Song Un-hoe·Sim Gi-sun. 『Pungak Mountain Travelogue』 is a travelogue that briefly records the itinerary for about 34 days from July 25th to August 29th in the form of a diary. The distinguishing characteristic of 『Pungak Mountain Travelogue』 is first, the plain writing. Although he went through a lot of different experiences, he wrote it simple and concise focusing on places and did not record his feelings or impressions, presumably because it was recorded after the excursion. His feelings and imprssions were recorded in Sino-Korean poems written during the excursion. During the tour of Mt. Geumgang, he composed 8 Sino-Korea poems. Two of 「Jangansa Temple」 「Myeongyeongdae Terrace)」 「Jeongyangsa Temple」 「Manpokdong Valley」 「Paldam Ponds)」 are five-character-line poems, while 「Yujeomsa Temple」・ 「Haegeumgang River)」are seven-character-line poems. Second, various anecdotes are introduced: holding his 60th birthday his in Seoul; the hardships he experienced while staying up all night in the forest on the way down due to bad weather while climbing Birobong; what the nuns of Chiboam Temple dreamed of, etc. As such, very strange and interesting anecdotes are introduced in relatively detail. 본 논문은 그동안 알려지지 않았던 회봉(晦峰) 안규용(安圭容, 1873~ 1959)의 『풍악산유람기(楓嶽山遊覽記)』를 고찰한 논문이다. 안규용은 송병선(宋秉璿, 1836~1905)의 문인으로 1921년 보성 진봉(眞鳳)에 죽곡정사(竹谷精舍)를 지어 강학활동을 하였으며 일본의 강점에 항거하다 구례와 광주에서 3개월 동안 구금되기도 하는 등 당시 호남지역에서 영향력을 행사한 유학자이다. 『풍악산유람기(楓嶽山遊覽記)』는 1933년에 안규용이 회갑을 맞아 금강산을 유람하고 지은 기행문이다. 1930년대는 철도 교통이 발달하면서 금강산 대중관광 시대가 열렸다. 보성 출신의 유학자들도 이 유행에 동참하여 ‘회갑’이라는 특별한 날을 기념하여 금강산 유람을 떠났다. 안규용과 함께 동행했던 인물로는 임기현·송운회·심기순이 있다. 『풍악산유람기(楓嶽山遊覽記)』는 7월 25일부터 8월 29일까지 약 34일의 일정을 일기형식으로 간단하게 기록한 기행문이다. 『풍악산유람기(楓嶽山遊覽記)』에 나타난 두드러진 특징은 첫째, 담박한 기록이다. 겪은 일이 많았지만 장소를 중심으로 간단하고 짤막하게 기록하였고 자신의 소회나 감정을 기록하지 않았다. 그 이유는 유람을 다녀온 후에 기록되었기 때문이라고 추정한다. 자신의 소회나 감정은 유람 중에 지은 한시로써 기록하였다. 금강산 유람 중에 8편의 한시를 지었는데 「장안사(長安寺)」⋅「명경대(明鏡臺)」⋅「정양사(正陽寺)」⋅「만폭동(萬瀑洞)」⋅「팔담(八潭)」 2수는 5언절구이며, 「유점사(楡岾寺)」⋅「해금강(海金江)」은 7언절구이다. 둘째, 특별한 일화를 소개하고 있다. 서울에서 자신의 회갑연을 개최한 일, 비로봉에 오르다 기상악화로 하산 도중에 숲속에서 밤을 지새우며 겪은 고초, 칠보암 여승들의 꿈에 선몽한 일등 매우 기이하고 특별한 일화를 담박한 기록 이면에 자세히 소개하고 있다.

슬로싱 액체 댐퍼를 이용한 사각형 폰툰의 운동 저감

조일형 한국해양공학회 2019 韓國海洋工學會誌 Vol.33 No.2

The interaction between a sloshing liquid damper (SLD) tank and a rectangular pontoon was investigated under the assumption of the linear potential theory. The eigenfunction expansion method was used not only for the sloshing problem in the SLD tank but also for analyzing the motion responses of a rectangular pontoon in waves. If the frictional damping due to the viscosity of the SLD tank was ignored, the effect of the SLD appeared to be an added mass in the coupled equation of motion. The installation of the SLD tank had a greater effect on the roll motion response than the sway and heave motion of the pontoon. One resonance peak for rolling motion showed up in the case of a frozen liquid in the SLD tank. However, if liquid motion in the SLD tank was allowed, two peaks appeared around the first natural frequency of the fluid in the SLD tank. In particular, the peak value located in the low-frequency region had a relatively large value, and the peak frequency located in the high-frequency region moved into the high-frequency region as the depth of the liquid in the tank increased.

Transmission coefficients of a floating rectangular breakwater with porous side plates

조일형 대한조선학회 2016 International Journal of Naval Architecture and Oc Vol.8 No.1

The interaction between incident waves and a floating rectangular breakwater with the vertical porous side plates has been investigated in the context of the two-dimensional linear potential theory. The matched eigenfunction expansion method(MEEM) for multiple domains is applied to obtain the analytic solutions. The dependence of the transmitted coefficients and motion responses on the design parameters, such as porosity and protruding depth of side plates, is systematically analyzed. It is found that the non-dimensional wavelength where the sudden drop of transmission coefficients occurs, corresponds to the heave resonant frequency obtained from Ruol et al. (2013) for p-type floating breakwater. It is concluded that both properly selected porosity and deeper protruding depth of side plates are helpful in reducing the transmission coefficients and also extending the wider applicable extent of incident wavelength for performance enhancement.