• 한국임상수의학회지
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• 제16권2호
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• pp.448-453
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• 1999

The three-dimensional structure of the Sertoli cell in the Korean native bull was investigated by scanning electron microscopy. Morphologically, four types of Sertoli cell processes were evident: 1) sheet-like processes, 2) sleeve-like processes, 3) bough-like processes and 4) finger-like processes. The sheet-like processes rested upon more than half of the surface of each spermatogonia, spermatocyte and spermatid. Sleeve-like processes, bough-like processes and finger-like processes are observed in the middle and apical portion of seminiferous tubule. All Sertoli cell processes are originated from Sertoli cell column. Just before spermiation, the apical sheet-like processes are shifted from their position at the spermatid head, and bough-like processes covered the disengaged residual body, after which the residual body was no longer evident in the tubule. Though the mechanism for this elimination is not known, the process suggests a reciprocity between the Sertoli and germ cells.

• 한국가축번식학회지
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• 제22권3호
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• pp.245-252
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• 1998

The three-dimensional structure of the Sertoli cell in the rat was investigated by scanning electron microscopy. Morphologically, seven types of Sertoli cell processes were evident : Shrot, flat and ramified processes are projected from the lateral side of the basal portion of Sertoli cell. Leaf-like processes are attached to the surface of spermatocytes and spermatids. Slender cord-like processes, flat and irregular shaped processes, sucker-like processes and club-like processes are observated in the middle and apical portion of seminiferous epithelium. The sheet-like processes rest upon more than one-thirds of the surface of each spermatogonium, spermatocyes and spermatids located in the proximity of the Sertoli cell. All Sertoli processes are originated from Sertoli cell column. Just before spermiation, the processes which are attached to the head of maturation spermatid are eliminated. Though the mechanism for elimination of residual body is not known, these observations segget that the Sertoli cell process are thought to have a reciprocity with the germ cells.

• Korean Journal of Mathematics
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• 제8권1호
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• pp.33-42
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• 2000

We generalize LePage-type representation of infinitely divisible processes and survey type G processes. Finally, we get integral representation and some inequality of processes of type G.

• 한국건설관리학회논문집
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• 제2권4호
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• pp.144-156
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• 2001

본 연구에서는 종래 건설 프로세스 상의 한계점을 분석한 후, 그 개선방안을 제시하였다. 본 연구에서 제시하는 개선방안은 설계도서의 철저한 사전검토를 통한 협력 업체의 공정계획 조기참여 방안이다. 이를 통해서 커뮤니케이션이 활성화되어 사전의견조정의 극대화를 확보할 수 있다. 본 연구에서는 데크플레이트 설치 프로세스와 덕트 설치 프로세스를 대상으로 사례연구를 수행하였다. 사례연구 결과, 협력업체의 조기투입과 설계도서 사전 검토를 통하여 체계적으로 건설 프로세스를 개선할 수 있었고, 구성원들의 사전의견조정을 통하여 건설생산 효율성을 제고할 수 있었다.

• 음성과학
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• 제8권2호
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• pp.7-22
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• 2001

This research with 40 hearing impaired children was performed to find out the characteristics of the phonological processes for each age, hearing loss degree and aided threshold degree through the transcriptions. The phonological processes of hearing impaired children are similar to those of normal children with a peculiar type of patterns in phonological processes. The results show that: (1) Between 5 and 6 year old groups the phonological processes were significantly different in palatal backing, glottal replacement and frication; between 6 and 7 year old groups the phonological processes were significantly different in velar fronting, labialization, alveolization and labial assimilation; between 7 and 8 year old groups the phonological processes, labialization, alveolization and alveolar assimilation, however 8 year old group showed more phonological processes than 7 year old group. (2) Between moderately-severe and severe hearing impaired groups, phonological processes were significantly different in the omissions of postvocalic, nasal and velar, stopping and stop assimilation. The differences of severe and profound groups were not found at all. (3) Aided hearing thresholds did not show any significant difference.

• 한국막학회:학술대회논문집
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• 한국막학회 1994년도 제2회 하계분리막 Workshop
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• pp.45-58
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• 1994

Over the last 20 years, membrane separation processes, such as reverse osmosis, ultrafiltration and microfiltration, have been widely adopted by different industries. Commercial uses of membrane have displaced conventional separation processes, such as distillation, evaporation, precoat filter and so on. Membrane separation processes are often more capital and energy efficient when compared with conventional separation processes. Membrane devices and systems are almost always compact and modular. These are the well-known advantages of membrane separation processes. The disadvantage of the membrane process is that the process does not have scale merit and thus the membrane process is suitable for the small and middle size applications. Energy saving is, of course, the biggest advantage of the membrane process, and in many industries the membrane processes are employed because of this reason. Membrane process has other big advantage. In many applications membrane processes provide much higher quality of product than conventional processes. The example is ultrapure water production by membrane processes in semiconductor industry. Conventional technologies never offer such good quality of pure water. If you can obtain both energy saving and higher quality of product at the same time by membrane processes, this is the best application of membrane processes. One example is the concentration of orange juice by membrane, which has already been commercialized in Japan. Comparing with the conventional vacuum evaporation process, juice concentrated by the membrane process has much better taste and flavor and the energy consumption in the membrane process is much less than the evaporation process. In this paper, first membrane separation technology will be classified and then Japanese membrane manufacturers and new modules and devices under development in Japan will be introduced. Fourth energy saving in membrane process will be discussed and finally practical applications of membrane processes in Japan will be shown.

• 한국IT서비스학회지
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• 제16권3호
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• pp.83-101
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• 2017

IT services are provided by many public institutions and companies in order to satisfy various needs of customers. As the modern IT systems become larger and more complex, it becomes more difficult for IT organizations to provide IT services. So, the IT organizations have applied or are planning to apply ITIL (Information Technology Infrastructure Library) in order to provide IT services systematically. The ITIL v3 was revised on July 2011 and have 5 categories, 37 processes, and 113 sub-processes. Therefore, it is known that it is very difficult to satisfy all processes of ITIL v3. If we can concentrate on the core processes of ITIL v3, we will be able to provide IT services more efficiently. The processes of ITIL v3 are defined as some processes influences other processes. Therefore, the core processes can be established using related techniques. We searched for previous research and related information, but we could not find any related research. In this study, we had applied the ANP (Analytic Network Process) techniques to find the core processes of ITIL v3. We expect that IT services will be provided more efficiently because we can be concentrate on the core processes of ITIL v3, which are the results of this study.

• 한국정보시스템학회지:정보시스템연구
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• 제15권1호
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• pp.169-189
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• 2006

Recently, many companies are trying to survive in a competitive business environment and they employ various kinds of information systems. Business Process Management (BPM) system is a software system that integrated enterprise information systems based on processes, which is considered an essential element for managing inner and outer processes. Though the BPM system has been applied to major processes only so far, companies begin to extends target processes applied into enterprise wide. In such settings, not only exact but also efficient management of processes is required. The efficiency of BPM has two perspectives: one is the performance of users that handle assigned tasks, and the other is the performance of the Business Process (BP) engine that carries out execution of processes. In this paper, in order to deal with the seconde perspective, we develop Drum, Buffer, and Rope (DBR) method, which have been considered innovative Theory of Constraint (TOC) method in manufacturing domain, for efficient management of processes. A new method, BP-DBR, has been developed, and we show that it is effective for business processes. The effectiveness of the method has been proved in terms of efficiency measures such as average process completion time and average number of completed processes, through a series of simulations on real banking processes.

• Communications for Statistical Applications and Methods
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• 제9권3호
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• pp.825-834
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• 2002

Poisson processes are widely used in reliability and survival analysis. In particular, multiple event time data in survival analysis are routinely analyzed by use of Poisson processes. In this paper, we consider large sample properties of nonparametric Bayesian models for Poisson processes. We prove that the posterior distribution of the cumulative intensity function of Poisson processes is consistent under regularity conditions on priors which are Levy processes.

• Journal of the Korean Statistical Society
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• 제30권1호
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• pp.127-138
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• 2001

In order to combine parametric and nonparametric approaches together for survival analysis with censored observations, a new class of priors called mixtures of the beta processes is introduced. It is shown that mixtures of beta processes priors generalized the well known priors - mixtures of Dirichlet processes, and they are conjugate with right censored observations. Formulas for computing the posterior distribution are derived. Finally, a real data set is analyzed for illustrational purpose.