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신정식,안중환,김화영,김형준,한승무,Shin, Jeong-Sik,Ahn, Jung-Hwan,Kim, Hwa-Young,Kim, Hyung-Jun,Han, Seung-Moo 대한기계학회 2005 大韓機械學會論文集A Vol.29 No.10
It is very important to achieve a high reproducibility in the ultrasonic measurement of bone mineral density. In this study, we examined number of sampling waveform, control of temperature, diameter of region of interest as factors to improve reproducibility. We decided the optimal number of waveforms to be converted to frequency domain as period of 1. We have minimized the effects of variable temperature and constrained generation of micro bubble by keeping temperature within a range of $32\pm0.5^{\circ}C$ with a precise temperature controlling algorithm. We also found the optimal diameter of region of interest to be 13mm. In this paper, we demonstrated the improved reproducibility by controlling various factors affecting the ultrasonic measurement of bone mineral density.
특별기고논문 : 한국회계학회창립전후(韓國會計學會創立前後)의 발자취
신정식 ( Jeong Sik Shin ) 한국회계학회 2015 회계저널 Vol.24 No.1
이 글은 한국회계학회가 창립된 1973년을 전후하여 약 30년 동안의 설립역사의 발자취를 살펴 본 것이다. 창립이전의 발자취는 회계학의 학문적 계몽기에 활약한 1세대 학자들의 업적을 인물중심으로 살펴보고 다음으로 학회의 전신인 회계학세미나의 활동상을 다루었다. 학회창립 이후의 발자취는 학술연구 활동과 주요사건을 중심으로 요약하여 조사·기록하였다. 한국회계학회의 발전된 위상은 결코 우연히 이루어 진 것이 아니며, 하루아침에 생겨난 것도 아니다. 오랜 세월의 발자취와 많은 사연이 함께 했다. 오늘의 한국회계학회는 학문적 환경이 열악했던 불모지에서 활약한 1세대 회계학자들, 역대학회장과, 임원, 회원교수들의 학문에 대한 애정과 교육연구에 대한 숭고한 노력의 결실에 의하여 이루어진 것이다. 학회창립 반세기를 눈앞에 두고 회계학계의 지난날을 되돌아보고 그 간의 발자취를 재조명하는 것은 의미 있는 일이라 생각한다. 그 누군가는 기록을 남겨야 훗날 학회의 발전사를 연구할 때 도움이 되리라고 본다. This paper investigates the history of Korean Accounting Association since 1973. Especially this study reviews the achievement of first generation of accounting fields, and then remembers the history of Korean Accounting Association before and after its foundation. This paper confirms that the current status of Korean Accounting Association is not coincidence, but the product of hard work by first generation founders, successive presidents, executives, and common members. This paper considers the remembrance of past years and reillumination of forebears’ trace are very meaningful inheritance to descendants.
활어수조에서 넙치 사육시 포말분리장치를 이용한 오염물 제거
신정식 ( Jeong Sik Shin ),이창근 ( Chang Kuen Lee ),정호수 ( Ho Su Jeong ),이민수 ( Min Su Lee ),이진경 ( Jin Kyung Lee ),서근학 ( Keun Hack Suh ) 한국수산과학회 2004 한국수산과학회지 Vol.37 No.6
N/A Removal of waste generated by Paralichthys olivaceus in the seawater aquarium using a foam separator was investigated. Protein concentration without a foam separator continuously increased until 3 days after stocking and reached at 25 ㎎/L after 5 days stocking, but protein concentration became lower than the initial protein concentration (2.5 ㎎/L) with a foam separator. The trends of other fish wastes such as ammonia, total suspended solids (TSS) and chemical oxygen demand (COD) were similar to protein. Dissolved oxygen (DO) in the aquarium decreased below 6.0 ㎎/L without a foam separator, but with a foam separator the average DO in the aquarium was 7.3 ㎎/L. Foam separation with the increase of superficial air velocity (SAV) was more effective than that with the fixed SAV. This study showed that wastewater treatment of seawater aquarium using a foam separator is effective method for a fish waste removal and oxygen supply.
신정식 ( Jeong Sik Shin ),김병진 ( Byong Jin Kim ),서근학 ( Kuen Hack Suh ) 한국수산과학회 2004 한국수산과학회지 Vol.37 No.3
N/A The characteristics of foam generation were assessed for freshwater and seawater using a foam generator. Both in freshwater and seawater, the height of the foam layer increased with initial protein concentrations. The height of the foam layer also increased with pore size of the air distributor. The optimum superficial air velocities (SAV) in freshwater and seawater were 0.84 cm/sec and 0.6 cm/sec, respectively. The height of the foam layer was the highest in pH 3 in freshwater and in the region of pH 5-7 in seawater. The height of the foam layer increased with NaHCO₃ concentration in freshwater, and NaHCO₃ concentration had little effect in seawater. Removal efficiencies of total suspended solid (TSS) and turbidity decreased with an increase of initial protein concentrations in a batch foam separator both in freshwater and seawater.
비접촉 공중 초음파 검사(NAUT) 기술을 이용한 비파괴 검사 시스템 개발
신정식(Jeong Sik Shin),김철훈(Chul Hoon Kim),김성태(Sung Tae Kim) 한국비파괴검사학회 2022 한국비파괴검사학회지 Vol.42 No.1
비파괴 검사에서 초음파는 방사선 피폭의 위험이 없으며 결함의 위치를 정확히 알 수 있고 결과를 현장에서 즉시 확인 가능하다는 등의 이유로 사용이 확대되고 있다. 그러나 초음파의 특성상 피검사체에 접촉을 해야 하는 한계로 인해 자동화 검사에 큰 장애가 되고 있으며 이를 극복하기 위한 노력으로써 비접촉 공중 초음파 검사법이 제시되고 있다. 현재 비접촉 공중 초음파는 복합소재, 용접, 항공 부품 등 다양한 분야의 검사에서 활용성이 증가되고 있는 상황이다. 그러나 현재 비접촉 공중 초음파 검사 시스템의 국산화는 전무한 상태이다. 본 연구에서는 공중 초음파 시스템에 필수적인 펄서/리시버와 스캐닝 시스템, 운영 및 진단 소프트웨어를 개발하고 성능을 평가하였다. 개발한 시스템에서 공중 초음파 검사 기술을 구현했으며 영상을 생성하여 결함의 상태를 시각화하였다. In non-destructive testing, the use of ultrasound has been expanding as it carries no risk of radiation exposure, the location of defects can be accurately known, and the results can be immediately checked on site. However, owing to the nature of ultrasound, the limitation of having to contact the subject is a major obstacle to automated inspection, and non-contact air-coupled ultrasound testing has been proposed in an effort to overcome this. Currently, non-contact air-coupled ultrasound is used for inspection in various fields such as composite materials, welding, and aviation parts. However, there is currently no localization of a non-contact air-coupled ultrasound inspection system. In this study, the pulser/receiver, scanning system, and operation and diagnostic software essential for the air-coupled ultrasound system were developed and their performance was evaluated. We implemented air-coupled ultrasound inspection technology in this developed system, and the state of the defect was visualized by generating an image.
해수활어수조에서 붕장어(Astroconger myriaster)와 넙치(Paralichyhus olivaceus)에 의한 오염물 발생량 산정
서근학 ( Kuen Hack Suh ),신정식 ( Jeong Sik Shin ),조재윤 ( Jae Yoon Jo ) 한국수산과학회 2004 한국수산과학회지 Vol.37 No.6
N/A Waste concentration and waste generation rate in seawater aquaria by common conger (Astroconger ntyriaster) and olive flounder (Paralichvhus olivaceus) were investigated. The initial fish density of common conger and olive flounder were 3% and 2.8% of total weight of aquarium water, respectively. Wastes in the seawater aquaria, such as protein, total suspended solid (TSS), ammonia, turbidity and chemical oxygen demand (COD) increased with days after stocking. Protein generation rate of common conger increased until 1 day after stocking while that of olive flounder increased until 3 days. The average protein generation rates of common conger and olive flounder were 0.28 g/kg·day and 0.21 g/kg·day, respectively. The trends of other waste generation rate were similar to protein generation rate.
서울지역 대형 연소시설에서의 질소산화물 제거효율과 배출계수 산정
신진호(Jin-Ho Shin),오석률(Seok-Ryul Oh),김정영(Jeong-Young Kim),전재식(Jae-Sik Jean),신정식(Jung-Sik Shin) 대한환경위생공학회 2003 대한환경위생공학회지 Vol.18 No.2
This survey was performed to investigate the NOx emission factors at 3 Municipal Solid Waste Incinerators(MSWI) and 5 Power generation boilers in Seoul. The NOx concentrations were measured before and after control systems. The results were as follows.<br/> 1) The NOx reduction efficiencies of Selective Catalytic Reduction (SCR) using ammonia as reducing agent ranged from 53.7% to 89.9%. The NOx reduction efficiencies of SCR using methanol as reducing agent. Non- Selective Catalytic Reduction (NSCm using ethanol as reducing agent and low-NOx burner were 20.8%, 29.1% and 24.7%, respectively.<br/> 2) The NOx emission factors at A-I. A-2 and A-3 facilities of MSWI were 0.786, 0.127 and 0.594 kg NOx!ton fuel. respectively. The factors of A-I and A - 3 facilities were higher than the average value of Korea.<br/> 3) The NOx emission factors at 13-1. 13-2. B-3. 13-4 and 13-5 facilities of Power generation boiler were 2.109, 0.726, 4.100, 8.378 and 5.168 kg NOx/ton fuel, respectively. The factors of 13-4 and 13-5 facilities were higher than the average value of Korea.