딥 러닝을 이용한 단면 접수 평판의 음향방사효율 예측

박성종(Seongjong Park),함종호(Jongho Ham),박형식(Hyungsik Park),이희성(Heesung Lee),이동연(Dongyeon Lee) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.4

선박에서 수중으로 방사되는 소음에 의하여 해양 생태계가 심각한 영향을 받고 있다. 이와 같은 피해를 줄이기 위하여 여러 국제 기구에서는 선박의 수중방사소음에 대한 규제 제정을 협의하고 있다. 선박이 연안을 항해하는 경우에 프로펠러 공동이 발생하지 않는 낮은 속도로 운항하며, 이와 같은 속도영역에서는 탑재 장비에 의한 선체 외판의 진동이 수중소음의 주요한 원인으로 간주된다. 따라서 선체외판과 같은 단순지지 단면 접수 평판의 음향방사효율을 빠르고 정확하게 계산할 필요가 있다. 평판의 방사효율은 모드 중첩법을 이용하여 수치적으로 계산할 수 있으나, 계산 시간을 크게 요구하여 실제 선박의 소음 해석에 적용하기는 한계가 있다. 본 연구에서는 인공 신경망 모형을 이용하여 단면 접수 평판의 방사효율을 예측하고, 이를 계산 시간과 정확도 관점에서 수치해석 결과와 비교하여 딥 러닝을 이용한 추정 기법의 적용 가능성을 검토한다. Marine ecosystems are severely affected by noise radiated from ships into the water. To reduce such damage, several international organizations are discussing the enactment of regulations on underwater radiated noise (URN) of ships. When a ship sails off the coast, it runs at a low speed to which propeller cavitation is not introduced, and the vibration of the shell plate caused by the onboard equipment is the major cause of underwater noise in such a speed range. Therefore, it is necessary to quickly and accurately calculate the acoustic radiation efficiency of a simply supported one side-wetted plate such as a shell plate. The radiation efficiency of the plate can be calculated numerically using a mode superposition method, but it requires a large calculation time; therefore, it is limited in application to the actual ship noise analysis. In this study, an artificial neural network model is used to predict the radiation efficiency of one side-wetted plate and the predictions are compared with the numerical analysis results from the perspective of both the calculation time and the accuracy to examine the applicability of the estimation technique using deep learning.

중속 엔진용 스파크 어레스터 일체형 SCR Mixer 설계

박성종(Seongjong Park),류용희(YongHee Ryu),이대희(Daehee Lee),이희성(Heesung Lee),이동연(Dongyeon Lee) 대한기계학회 2021 大韓機械學會論文集B Vol.45 No.3

중속 엔진 배기관에 소음 기준 만족을 위한 소음기, 인화성 입자의 방사를 방지하는 스파크 어레스터, 배기가스에서 질소산화물(NOx)을 저감하는 탈질 장비(SCR) 그리고 폐열 회수를 위한 이코노마이저를 모두 설치하도록 요구하는 선박이 점점 증가하는 추세이며, 이로 인하여 배기관에는 설치 공간 부족과 압력 손실 문제가 발생하고 있다. 배기관의 여러 장비 중 SCR mixer는 한 단의 고정 베인(stationary vane)을 이용하여 난류 유동에 의하여 배기가스와 암모니아를 적절하게 혼합하고, 스파크 어레스터에도 배기가스로부터 인화성 입자를 분리하기 위하여 한 단의 고정 베인이 설치된다. 본 연구에서 이와 같은 두 장비를 결합하여 한 단의 베인만으로 혼합과 분리의 역할을 동시에 수행할 수 있는 스파크 어레스터 일체형 SCR mixer(S-mixer)를 설계하였다. 유동 해석을 통하여 다양한 case에 대한 인화성 입자의 포집성능과 암모니아와 배기가스의 혼합 성능 그리고 압력 손실을 수치적으로 계산하였으며, 예측 결과를 고려한 S-mixer의 최적 설계 안을 선정하였다. Latest vessels have increased the demand for silencers to meet noise standards, spark arresters to prevent the emission of flammable particles, selective catalytic reduction (SCR) reactors to reduce nitrogen oxides (NOx), and economizers to recover waste heat for middle-speed engine exhaust pipelines. This has led to a shortage of installation space and pressure loss in exhaust pipelines. In exhaust pipelines, the SCR mixer is used to properly mix exhaust gas and ammonia by turbulent flow using a stationary vane located below the SCR. A stationary vane similar to a spark arrestor is also installed in the silencer to remove flammable particles from the engine. In this study, a spark-arrestor-integrated SCR mixer (S-mixer) is developed using a combined single stationary vane that can simultaneously mix exhaust gas and ammonia and separate flammable particles in the mixer. Computational fluid dynamics analyses were performed for various cases to evaluate the trapping performance of flammable particles and the mixing performance of ammonia and exhaust gas, measuring pressure loss numerically. An optimal S-mixer design is proposed considering the study results.

특별기고논문 : 감리사례 ; 도산모형과 비재무적요인을 이용한 영화투자기업의 감사실패사례연구

박성종(제1저자) ( Sung Jong Park ),김동원(교신저자) ( Dong Won Kim ),정준희(공동저자) ( Joon Hei Cheung ) 한국회계학회 2015 회계저널 Vol.24 No.3

본 사례는 증권선물위원회의 감리결과로 나타난 영화투자업을 영위하는 페일필름의 회계 부정과 파산사례를 살펴보는 것을 목적으로 한다. 이를 위해, 사업보고서의 비재무사항과 재무사항을 통해 페일필름의 분식회계 위험과 징후를 살펴보고, 파산위험에 대해 알아본다. 다음으로, 페일필름의 구체적인 회계부정의 방법과 항목을 살펴본다. 나아가 감사인의 감사실패 사항을 분석함으로써, 감사인의 책임과 윤리의식에 대해 논한다. 본 연구는 재무제표 작성자와 감사인뿐만 아니라 투자자 관점을 함께 고려하여 감리사례를 분석하고자 하였다. 이를 위해, 사업보고서에 나타난 비재무사항 10개를 선정하여 비재무사항이 감사위험에 미치는 영향을 분석하고, Altman Z-SCORE를 통해 파산위험과 감사위험에 대해 살펴보았다. 끝으로 감사인의 윤리의식에 대해 논하였다. 본 사례를 통해, 회계부정, 파산위험 및 사업보고서의 분석을 아울러 배울 수 있으며, 감사인의 책임과 윤리의식에 대해 학습할 수 있을 것으로 기대한다. This study investigates the method, item and bankruptcy risk of unjust accounting through the case of window dressing accounting of "Fail Film" found under the system of supervision. Further, it analyzes the sign of unjust accounting through non financial matters of business report of "Fail Film". In addition, we invest each issues regarding the violation of the accounting principle such as, advance payments, investments in stocks accounted for under the equity method and contingent liability. Although "Fail Film" carried on publication and advertisement service business, its business type actually changed when major stockholders changed in December, 2005 and entertainment business like film investment and distribution business became main business since 2006. Even though the company did not change auditor since establishment (even after it was listed), it first changed auditor after changing major stockholders. Before change, the auditors expressed standard opinion on their final audit report, but indicated 13 items as specific matters. Since specifying specific matters in 13 items was very unusual situation, the company appeared abnormal only with such number of specific matters instead of seriousness of the individual item of specific matters. Although the new auditor fully recognized such abnormal situation, he decided to take audit job and concluded audit agreement. The new auditor failed to reflect the error of diminutive appropriation of sales cost in the audit opinion, failed to find the error of excessively appropriated advanced payment, because the auditor as an expert failed to fully audit advanced payment which occupied 28% of total asset of the company. Further, the auditor failed to find the fact that many notes and checks were provided for mortgage. The "Fail Film" has many non financial information about manager``s fraud and earnings management. The "Fail Film" does not have audit committee, financial experts in the audit committee, labor union, foreign investors and nominating committee that associated with lower levels of earnings management and accounting irregularities. In addition, "Fail Film" changechief executive officer and major stockholders, corporate name in 2005. The information is meaningful in that it can provide auditor with warning signals for predicting accounting fraud. The auditor of "Fail Film" failed in audit as stated above, although he understood the individual items of specific matters and their number written in the audit opinion of previous auditor as well as non financial information, and financial information of "Fail Film". This fact implies that he was quite problematic in the ethical level of auditor and expertise, the basic requirement of auditor who audits accounting. Through the case of failed accounting of auditor for "Fail Film", we are to check the method used for unjust accounting of the company and the problems in audit procedure of auditor in the process of accounting audit. Therefore, we suggest that auditor and regulator need to use various non financial information and bankruptcy forecasting models such as Altman``s Z-score for finding accounting fraud or earnings management. We hope that researcher find other non information that associated with higher levels of accounting fraud. This study is meaningful in that it considers not only the viewpoint of preparer of financial statements and auditor but also that of investor. For instance, it presented the significant items of non financial matters indicted on the business report, thereby providing merit to learn the analysis of unjust accounting, bankruptcy risk and business report. It is expected that the participants of capital market, its researchers and students can learn the responsibility and ethical sense of auditor with knowledge in audit procedure.

李兆年의 『鷹鶻方』에 나타난 吏讀文 作品에 대하여

박성종(Park Seong-Jong) 국어국문학회 2008 국어국문학 Vol.- No.148

Eunggolbang(鷹?方) is a book about the hawks and the falcons and their breeding up and falconry. There are three kinds of books containing somewhat different contents, and the one kind of them is written by Jo-Nyeon Lee(1269-1343) at the end of Goryeo Dynasty in the first half of the 14th century. In the copies of this kind there is a composition which is irrelevant to hawk and falcon at the finis of the copies. A copy of this kind preserved in National Library of Korea is presumably to have been handwritten and possessed by Jeong-Bok Ahn(安鼎福 1712-1791). The composition is titled a civil petition by Jinsa Hahn(韓進士) living in the province of Myeoncheon. It consists of two elements, the one of which is a civil petition sent to the local governor Dae-Sin Lee. and the other of which is the local governor's written adjudication returned to the petitioner. The contents of the petition are as follows: A classical scholar whose family name was Hahn had bought four servants from the Chinese famous poet Baek Lee(李白), and three persons of them got away along with their descendants. Thus, Jinsa Hahn wanted an extradition of the fugitives and sent a document to the local governor in the name of his own female servant Sigeum(試今). The governor's answer to this petition was as follows: Before bring her along for the purpose of more exact investigation the governor myself is about to send a fugitive male servant named Jangji(壯紙) along with his descendants to the petitioner. The names of servants. Sigeum(試今), Mukdeok(墨德), Pilgeum(筆今) and Jitong(紙筒) are personifications of a poem, an ink-stick, a writing brush and a sheet of paper respecively. The composition contains illustrations and characteristics of the servants, and also mention of the things and the superior goods relevant to the above-mentioned servants. The composition is proved to be a literary work written in idu scripts in the form of a document. a civil petition. This work shows an excellent imagination and abundant wit of the author Jo-Nyeon Lee, who is considered to liken himself to Baek Lee. In one hand. this work may be a transcription of a document by the author and its responding answer by the local governor. It may have really occurred that the author had asked his governor for some stationaries necessary for writing poems and the governor accordingly gave many sheets of paper to the author. It should be noted that this literary work was made in the form of an document usually written in idu. And the most important point of this old Korean literary work might be the fact that it is a recorded work according to the writing system of Korea at that time of the author's. Most old Korean literary works are in striking contrast to this work in that they have been recorded later with Korean writing systems or by way of Chinese translations.

15세기 첩정의 분석

박성종 ( Park Seong Jong ) 한국고문서학회 2003 古文書硏究 Vol.22 No.-

This paper aims to translate some pieces of cheopjeong in the 15th century into modern Korean and briefly survey their conventional forms in composition. Cheopjeong, which was the official document to superior government, had been written in idu(吏讀). 7 pieces of cheopjeong are known at present. 5 pieces were used as materials in the process of making books by printing on the back of them. One of them is the official document which was sent to the lord Chungcheong-do(忠淸道) from one of his subordinative officers, Gyeolseonghyeon-gam(結城縣監). The other 4 pieces are also the official documents sent to the lord of Gyeongsang-do(慶尙道) from his subordinative officers. And 2 pieces of Cheopjeong were sent to the lord of Gyeongsang-do by one of his subordinative officers, Bonghwahyeongam(奉花縣監). 3 pieces of cheopjeong were made by the district presidents who were ordered to prepared and send various presents for the king of Joseon(朝鮮) by their supervising government`s lords. Gyeolseonghyeon-cheopjeong(結城縣牒呈) was made to inform its lord of the falcons, which were probably presents for the king of Joseon. Jinbohyeon-cheopjeong(眞寶縣牒呈) reads that we send 6 doe(되) of new honey, and Yeongcheongun-cheopjeong(永川郡縣牒呈) reads that we send 2 mal(말) of raw chestnusts. 2 pieces of cheopjeong were made for so-called sugyeol(愛決), by which we mean the asking for commands of supervisor.

吏讀字 ‘內’의 讀法

朴盛鍾(Park Seong-jong) 구결학회 2007 구결연구 Vol.19 No.-

借字表記字 ‘內’의 독법에 관해서는 音借字로 본 견해, 訓借字로 본 견해, 그리고 添記的 요소 또는 指定文字로 본 견해 등이 있으나 아직 定說로 인정할 만한 것을 찾기 어렵다. 본고는 지금까지의 관련 연구들의 대강을 훑어 보고, 이 문제에 대한 해법을 찾고자 하였다. 본고는 이를 위해 먼저 麗末鮮初의 이두문에 사용된 ‘內’의 용법을 몇 가지로 나누어 고찰하 였다. 논의 과정에서 讀字로 쓰인 것은 제외하였다. 이 가운데 특히 주목한 용법은 養蚩經驗撮要와 農書輯要의 이두문에서 문종결 위치에 쓰인 ‘使內’, 그리고 准戶口의 첫머리에 기재된 문장 끝에 붙는 ‘爲內敎’ 중의 ‘爲內’, 그리고 太祖賜給芳雨土地文書(1392년)에 쓰인 ‘喫持是內敎’ 중의 ‘-是內’ 용법이며, ‘望良白內臥乎事’ 중의 ‘望良白內’도 이에 준하는 것으로 보았다. 이들은 모두 문종결의 위치에 사용되었는데, 이 용법은 매우 이른 시기로부터 존속되어 온 것으로서 명사문의 존재를 시사해 준다고 보았다. 그리고 이 경우의 ‘內’는 확인법 선어말어미와 유사한 형태소와 동명사 어미 ‘-ㄴ’이 통합된 형태를 표기한 것이라는 가설을 세워 보았다. 최근에 발굴 소개된 月城垓字木簡 제149호에 적힌 문구 맨 마지막의 ‘使內’는 이러한 가설을 충족시키는 것으로 판단하였다. 이에 따라 麗末鮮初 시기와 7세기 이전의 이두에 사용된 借字 ‘內’는 ‘안’ 정도로 읽히는 訓假字로 규명하였다. 麗末鮮初의 이두문에 사용된 ‘內’의 또 다른 용법들에 관해서도 살펴 보았다. 이 중 ‘爲白內等’은 당시의 언어를 반영하는 표현으로서 후대에 이어져 갔다고 보았는데, 이 경우의 ‘內’ 역시 ‘안’으로 읽히는 訓假字다. 본고에서의 논지가 신라와 고려 시대의 이두 자료에서 어느 정도 유효한지, 그리고 시기별로 용법상의 차이나 독법 및 문법적 기능의 변천이 있었는지의 문제는 後稿로 미루었다. It has been one of the difficult subjects that what the letter '內' can be read in Idu sentences. In order to solve this problem, we looked into many usages of Idu sentences including '內' from the period of late Goryeo dynasty and to the period of early joseon dynasty. Among the usages the most important and meaningful ones are '使內' and '爲內' which were used to bear the role of closing a sentence. Some examples of the former were found in literatures, 養?經驗撮要 and 農書輯要. And the latter examples were found in the old documents 准戶口 of those times. The usages of '使內' and '爲內' located at the last boundary of a sentence seem to have been handed down from the early old times. It is presumed that '內' included one of the prefinal endings which work for ascertaining an event or a proposition and the deverval ending '-n' which works for forming noun phrase like gerund in English. Fortunately, we found one example of the usage '使內' written at the end of a paragraph. It was written on the face of a wooden slice which comprised four sides. And the wooden slice seems to date back to the 6th century or the 7th century. So, it has come to be proved that the Idu script '內' was read ‘안’, the Korean word corresponding to Chinese letter concerned, at least at the period before the 7th century and around the 14th century and the 15th century.

장전처신씨선덕이년소지의 복원

박성종 ( Park Seong Jong ) 한국고문서학회 2003 古文書硏究 Vol.23 No.-

There is a piece of old documents which was written by an old woman whose last name is Sin, the wife of the late Mr. Jangjeon(장전). It is one of the so-called soji(所志), which were written petitions. It was written for the purpose of asking the lord of Gyeongsang-do(慶尙道) to command one of his subordinative officers, Sunheungbusa(順興府使), that the fugitive slaves be arrested, investigated and returned. At that time the fugitive slaves were also obliged to compensate their masters for loss. This document mentioned above has been owned and handed down by the Indong- Jmg -ssi(仁同張氏)`s clan in Yeongju-si(榮州市) of Gyeongsangbuk-do(慶尙北道). It is somewhat transformed and included in a scrapbook titled Yumukcheop(&BlJ&) which was made in praise of the family`s ancestors. And also it is designated as one of national valuables No. 1005 together with the other documents in the scrapbook and various other old documents. Scholars know this document very well, because it is very antiquated and important enough to be cited often in various articles and books on history of Korean society or Korean paleography. But some loss and damage of letters in this document has made us equivocate or roughly explain its contents. So, I dared to translate it into modem Korean by inferring the lost letters according to its context and by distinguishing idu(吏讀) characters from Chinese characters. In this document the fugitive slaves, who are wanted by the country government according to Miss Sin`s petition, are four. They are all women. Only one of them is owned by the petitoner, the eldest daughter of Sin`s family. Among the four women are there slaves who were owned by the third and last daughter of Sin`s family. Early enough in 1404, this woman`s ownership of those slaves was demonstrated by a piece of hwahoemunkki(和會文記)s, the Written agreements by all the heirs and heiresses. The eldest daughter`s slave is Yanguideok(良衣德), who is a descendant of male slave Jangrnan(長万). One of the four female slaves is Jangjang(長莊 )who was registered as a slave of the third daughter`s. Another one is Geumjang(金莊) who is a descendant of female slave, Dohwa(桃花). Dowha was also a slave of the third daughter`s. The last one`s name is Yeonhwa(?花 )but this one`s family lineage is ambiguous. She is either a sister or a descendant of Jangjang. We mean an official opinion and order of the government leader concerned by Jesa(題辭). The Gyeongsang-do lord`s jesa is as follows. The control of this petition case should be transferred to the country government of Sunheungbu. In treating this case, the king`s message should be necessarily obeyed and the slave registers should be used to check the slaves` idendities.

공조소음 저감을 위한 조합소음기 개발

박성종(Seongjong Park),김종도(Jongdo Kim),박용환(Yonghwan Park),김봉재(Bongjae Kim),최호경(Ho Kyung Choi) 대한기계학회 2018 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.6 No.1

공조시스템의 설계에서, 송풍기의 소음을 줄이는 것은 가장 중요한 요소 중 하나이다. 선박용 공조시스템에 널리 사용되는 축류송풍기는 작동성 및 내구성에서 많은 장점을 가지고 있지만, 저주파수대역에 위치한 날개 통과 주파수(BPF) 소음이 문제가 되고 있다. 기존의 소음기는 중중파수 및 고주파수 대역의 소음을 효과적으로 저감하지만, BPF 소음과 같은 저주파수 대역의 소음을 저감하는데 한계가 있다. 본 논문은 BPF 소음을 저감하기 위하여 사이드 브랜치 공명기를 기존 소음기에 적용하는 것을 제안한다. 소음기 내벽 및 공명기의 외벽에 설치된 흡음재와 함께 전체 주파수 대역의 소음을 제어할 수 있다. In the design of HVAC system, reducing the noise from fan is one of the most critical factors. Although axial fan which is widely used in ship HVAC system has many advantages in operability and durability, the low frequency noise called blade passing frequency (BPF) noise has always been an issue. The conventional type of silencer can effectively reduce the noise of mid-high frequency band, but it has limitations on removing noise of low frequency band such as BPF noise. This paper suggests the application of side branch resonators to the conventional silencer to reduce the BPF noise. Along with sound absorbing material installed on silencer inner wall and resonators outer wall, we can control the noise from all frequency bands.

리튬-이온 배터리 팩의 열관리 시스템 설계

박성종(Seongjong Park),유종근(Jong Keun Yu),이희성(Heesung Lee),최호경(Ho Kyung Choi) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

다색 광원에 대한 가우시안 진폭을 갖는 광학계의 결상 특성

박성종(Seong Jong Park),박혜정(Hae Jong Park) 한국안광학회 1999 한국안광학회지 Vol.4 No.2

To investigate the image-forming property of optical system having Gaussian amplitude for polychromatic source, we calculated the chromaticity variation and the illuminance distribution. Considered polychromatic sources in this paper are A light which is on incandescent-tungsten lamp, C light which is a daylight, and D_n = light which is a extend daylight to the near ultraviolet. The polychromatic sources represent the different chromaticity values at a geometrical image point. The chromaticity variation of optical system having a Gaussian amplitude is smaller than that having an uniform amplitude. The illuminance distributions for polychromatic sources present nearly the same values, and the depth of focus for optical system having a Gaussian amplitude is wider than that having an uniform amplitude. From these results, we know that the depth of focus increases and the chromaticity variation decreases, when the incident light amplitude is modulated from an uniform amplitude to a Gaussian amplitude.