CWM 단일액적의 연소특성에 관한 연구

박종상,이태원,하종률,정성식,Park, Chong-Sang,Lee, Tae-Won,HA, Jong-Yul,Chung, Sung-Sik 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.3

As the combustion process of CWM consists of the water evaporation, the release and combustion of volatile matter, and the combustion of char for every particle, it is more complex than that of existent liquid fuel. Though the many studies on CWM combustion have been carried out by the single droplet using hanging methods or the multiple droplet using atomization methods, any report don't presents definite solution about the effects by the initial water evaporation and combustion of volatile. When CWM is suddenly exposed in the high temperature surroundings, the internal water evaporates and then each droplet builds up pores. Besides, porosity rate changes along the temperature of surroundings, the composition ratio of CWM, and the initial diameter of droplet. In result, because it affects the whole combustion rate, the combustion of CWM has complex mechanism as compared with the combustion of liquid or gas fuel. Therefore, concentrating on porous structure of CWM, this study has proceeded to acquire the basic data on the CWM injection combustion and closely examines the effects of the first stage combustion on the whole combustion by measuring the diameter variations, pore rate, mass fraction burned, and the internal temperature changes of CWM droplet. The results demonstrate that $60{\sim}70%$ of initial mass is reduced during water evaporation and volatile combustion period, and swelling rate, mass faction burned, and density variation are greatly concerned with atomization of CWM etc.

알로에 발효주의 barbaloin 함량변화

박종상,성창근,장기운,Park, Jong-Sang,Sung, Chang-Geun,Chang, Ki-Woon 한국응용생명화학회 1996 Applied Biological Chemistry (Appl Biol Chem) Vol.44 No.1

알로에 술의 품질향상 및 산업화를 위한 연구자료로서 알로에 술의 제조법을 과학화하기 위하여, 알로에 첨가량에 따른 알로에 술의 특성과 지표성분 함량변화를 살펴본 결과는 다음과 같다. 발효과정 중의 알콜 생산은 0.5%의 알로에 분말 첨가구에서 당을 15%, 20%, 25%로 증량시 약 6.3%, 9.6%, 그리고 11.3%의 알콜이 각각 생성되었다. 술덧중에 알로에의 첨가량이 늘어나면서 알콜의 생산이 완만하게 저하되었다. 알로에의 지표성분으로서 알려져 있는 barbaloin은 0.5% 알로에 첨가구에서 barbaloin의 양은 발효 7일 후 4.2 mg/ml, 10일후에는 4.6 mg/ml이었으나, 30일 후에는 다시 감소되었다. 알로에의 첨가량에 따른 기호도로서 알로에의 쓴맛에도 불구하고 1.5%와 2.0%의 알로에 첨가가 높은 선호도를 보였다. For the scientific approaches and quality control of aloe wine as fundamental studies of industrialization and quality improvement, change of barbaloin content during the fermentation period and various characteristics of aloe wine were investigated. Alcohol of 6.35, 9.6%, and 11.3% in the 0.5% concentration of aloe powder was produced from 15%, 20%, and 25% addition of sugar in the wine mash, respectively, As the content of aloe powder is increased, production of alcohol was slightly decreased, indicating aloe powder might contain antimicrobial activity. The content of barbaloin in the 0.5% concentration of aloe powder was 4.2 mg/ml, 4.6 mg/ml and 2.21 mg/ml after 7, 10 and 30 day, respectively. The tasty characteristics of aloe wine brewed with aloe powder of 1.5% and 2.0% were most acceptable to the sensory panels.

Developement of New Separation Process for the Preparation of Storage - Stable Liquid Dyes

박종상,이정학 ( Jong Sang Park,Chung Hak Lee ) 한국공업화학회 1990 한국공업화학회 연구논문 초록집 Vol.1990 No.3

Dry-Gel Hybridization with Synthetic Oligonucleotides Complementary to Human Insuline Receptor Gene

박종상,Park, Jong-Sang 생화학분자생물학회 1989 한국생화학회지 Vol.22 No.2

사람 인슐린 수용체 유전자에 상보적인 짧은 합성 올리고뉴크레오타이드를 사용하여 건조-젤 막에 직접 hybridization시켰다. 씻는 온도를 $60^{\circ}C$ 근처로 맞추면 사람 인슐린 수용체 유전자에 해당하는 DNA의 한 밴드를 검출할 수 있었다. 건조-젤 법은 간단하고 시간이 절약되며 southern blotting 만큼 감도가 좋다. Synthetic oligonucleotides complementary to the human Insulin Receptor gene was hybridized with dry-agarose gel membrane directly without DNA blotting. A single band of human insulin receptor gene can be detected with the proper washing temperature. This technique is simple, time-saving and as sensitive as southern blotting to detect a single copy gene.

역확산을 이용한 액체염료의 제조

박종상,이정학 ( Jong Sang Park,Chung Hak Lee ) 한국공업화학회 1991 공업화학 Vol.2 No.4

저장 안정한 액체염료의 제조를 위하여 새로운 분리 기술을 도입하였다. 액체염료에 함유된 무기염의 종류, 농도 및 액체염료의 저장기간이 염료분자의 집합(aggregation)과 안정성에 미치는 영향을 실험측정하였다. 높은 염농도에 의한 염료분자의 집합의 형성을 방지하기 위해 표면처리한 중공사막을 이용한 역확산(counter diffusion) 법을 도입하여 액체염료에 함유된 염을 선택적으로 제거하였다. 역확산에 의한 염의 제거 효율은 1회 통과에 5-20%였고 염과 염료의 분리비는 10-700으로 매우 큰 값을 갖는 반면 염료의 손실율은 0.4%이하였다. 모델식을 이용하여 구한 염과 염료의 막에 대한 물질전달 계수 (U_(M, Na,) U_(M, Dye))는 표면처리한 경우에 각각 2.75와 0.72 l/㎡/hr의 값을 나타내어 염과 염료의 혼합액에서 염의 선택적 분리가 가능함을 보여주었다. 또한 탈거수 및 공급액의 유속, 막의 막힘현상이 염의 제거 호율에 미치는 영향을 연구하였다. New separation process was developed for the preparation of storage-stable liquid dyes. The extent of aggregation of dye molecules was measured with respect to storage time of liquid dyes under different salt environments. Hollow-fiber membranes were modified by immobilization of inorganic crystals onto the surface of membrane. Using surface-treated membranes, counter diffusion technology was introduced to selectively remove salts from dye solution. The separation factors were 10-770, and the less of dye molecules was less than 0.4 %. Membrane permeabilities for sodium ions(U_(M, Na)) and dye molecules(U_(M, Dye)) were found to be 2.75 and 0.72 l/㎡/hr, respectively, in the case of surface-treated membranes. The effects of various operating parameters on desalting efficiency were also investigated.

정적연소기에서 라디칼 유도분사를 이용한 예혼합기의 연소특성에 연구

박종상(Jongsang Park),최하성(Hasung Choi),이명준(Myungjun Lee),하종률(Jongyul Ha),정성식(Sungsik Chung) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1

An experimental study was carried out to obtain fundamental data about effects of radical induced injection using a tiny sub-chamber on the combustion of pre-mixture in a constant volume chamber. The volume of the sub-chamber is set up to occupy less than 1.5% of that of whole combustion chamber, numerous narrow passage holes are arranged to induce simultaneous multi-point ignition in the main chamber by flame jets including radicals from the sub-chamber, and the equivalence ratio of pre-mixture in the main chamber and the sub-chamber is uniform. And also, the visualization of combustion is executed in the main chamber.<br/> In the case of radical ignition method(RI), the overall burning time including the ignition delay became very short compared with that of the spark ignition method(SI). AS the diameter of passage holes and the volume of the sub-chamber increase, the combustion characteristics of the RI becomes similar to that of the SI.

알로에 발효주의 barbaloin 함량변화

박종상(Jong Sang Park),성창근(Chang Sung),장기운(Ki Woon Chang) 한국응용생명화학회 1996 Applied Biological Chemistry (Appl Biol Chem) Vol.39 No.3

For the scientific approaches and quality control of aloe wine as fundamental studies of industrialization and quality improvement, change of barbaloin content during the fermentation period and various characteristics of aloe wine were investigated. Alcohol of 6.3%, 9.6%, and 11.3% in the 0.5% concentration of aloe powder was produced from 15%, 20%, and 25% addition of sugar in the wine mash, respectively. As the content. of aloe powder is increased, production of alcohol was slightly decreased, indicating aloe powder might contain antimicrobial activity. The content of barbaloin in the 0.5% concentration of aloe powder was 4.2 ㎎/㎖, 4.6 ㎎/㎖ and 2.21 ㎎/㎖ after 7, 10 and 30 day, respectively. The tasty characteristics of aloe wine brewed with aloe powder of 1.5% and 2.0% were most acceptable to the sensory panels.

정적연소기에서 라디칼 유도분사를 이용한 예혼합기의 연소특성에 관한 연구 (제3보)

박종상(Jongsang Park),오동헌(Dongheon Oh),하종률(Jongyul Ha),정성식(Sungsik Chung) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

A prior fundamental study was executed using a constant volume chamber to improve the burning properties<br/> of lean pre:-mixture by the injection of active radicals generated in the sub-chamber. In consequence. RI method shows<br/> remarkable progress in the aspects of burning velocity and combustible lean limit compared with SI method. In this :study, the necessary additional works have been performed to be: based on the: former results. We changed parameters as the initial temperature and the initial pressure of mixture. And the: effects of resident gas at issue in a ureal engine were investigated. As a result, the effects of initial temperature were significant, but on the other hand. those of initial pressre were slight. The correlation of passage hole number between overall passage hole area was grasped. And the more detailed analysis is required on resident gas.

RI 방식 CNG 엔진의 분사시기가 연소특성에 미치는 영향

박종상(Jongsang Park),진종무(Jongmoo Jin),하동흔(Dongheun Ha),염정국(Jungkuk Yeum),이중순(Joongsoon Lee),정성식(Sungsik Chung) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-

The prior study for RI(radical ignition) method was carried out in the experimental ways using a CVC(constant volume combustor) and applying the basic results from the CVC to a real engine. The rapid combustion and the expansion of the combustible lean limit of RI method were realized by the 0.45% sub-chamber volume of the overall combustion chamber in the CVC. But the gasoline fueled RI engine showed the severe problem of high cycle variation due to the difficulty of the residual gas scavenge in the sub-chamber from the former cycle. To solve this problem, CNG fuel was directly supplied into the sub-chamber instead of the port fuel injection. A DI Diesel Engine with the same specifications used in a previous study was modified to a RI-CNG Engine, and injection pressure was constantly kept at 6㎫ by a regulator. This study was performed to investigate the effects of injection timings on the combustion and performances of the RI-CNG Engine. The excess air ratio was varied from 1.0 to the lean limit at the condition of 50% throttle open rate and 1700rpm. The combustion characteristics of the RI-CNG engine such as in-cylinder pressure, indicated thermal efficiency, cycle-by-cycle variation, combustion duration and emissions were investigated.

6·25전쟁 시 장사상륙작전에 대한 재검토

박종상(Park Jongsang) 동북아역사재단 2020 東北亞歷史論叢 Vol.- No.69

장사상륙작전은 6·25전쟁 중이던 1950년 9월에 동해안의 경북 영덕 일대에서 실시되었다. 장사상륙작전은 인천상륙작전과 같은 시기에 동해안에서 실시되었다. 장사상륙작전은 기상불량으로 인해 상륙작전 초기부터 많은 희생이 뒤따랐다. 또한 해안에 상륙하자마자 북한군의 공격으로 인해 추가적인 희생자가 발생하여, 상륙한 이후 1주일도 되지 않아 해상으로 철수한 상륙작전이었다. 그동안 장사상륙작전에 대한 연구는 증언록이나 회고록을 중심으로 이루어졌기 때문에 상륙작전의 준비과정에서부터 전개과정 및 철수과정 등에 대한 객관성이 다소 결여되었다고 할 수 있다. 이러한 연구결과로 인해 장사상륙작전은 서해안에서 인천상륙작전이 전개되던 같은 시기에 실시되어 인천상륙작전의 작전지역 기만에 커다란 영향을 준 양동작전의 일환으로 인식되어왔다. 따라서 이 글에서는 준비과정에서부터 전개 및 철수과정까지 잘못 인식되어 있는 부분을 재검토하였다. 그리고 상륙작전의 성공 여부, 인천상륙작전과의 관련성에 대한 잘못된 인식, 군사용어에 대해 잘못 인식하고 있는 부분을 정리하고 검토하였다. 이를 위해 장사상륙작전에 대한 공간사와 기존의 연구물들을 검토하여 장사상륙작전의 준비과정과 전개 및 철수과정에 대해 정리하였다. 그리고 국내에 소개되지 않았던 미 국립문서기록관리청(NARA)의 기록문서를 중심으로 장사상륙작전에 대하여 재검토하였다. The Changsa Landing Operation was conducted in September 1950 during the Korean War in Yeongdeok, Gyeongbuk, on the East Coast. The Changsa Landing Operation was conducted on the East Coast around the same time as the Incheon Landing Operation. Due to poor weather conditions, the Changsa Landing Operation has cost a lot from the beginning of the landing operation. In addition, as soon as they landed, additional victims were incurred due to the North Korean attack, and it was an amphibious operation that withdrew to the sea within less than a week after landing on the coast. In the meantime, research on the Changsa Landing Operation can be said to have somewhat lacked objectivity from the preparation process of the landing operation to the development process and withdrawal process due to the research centering on testimony and memoirs. Due to these research results, the Changsa Landing Operation was conducted at the same time when the Incheon Landing Operation was unfolding on the west coast, and it has been recognized as a part of demonstraion operation, which greatly influenced the deception of the operation area of the Incheon Landing Operation. Therefore, this paper reviewed the misrecognized parts from preparation to deployment and withdrawal. In addition, the Changsa Landing Operation was successful or failed, misconception about the relevance of the Incheon Landing Operation, and misrecognition of military terminology were organized and reviewed. To this end, the space history of the Changsa Landing Operation and the existing research materials were reviewed, and the preparation, development, and withdrawal process of the Changsa Landing Operation were summarized. The Changsa Landing Operation was reviewed, focusing on the documented documents of the National Archives and Records Administration(NARA), which were not introduced in Korea.